"""
ShopAgent - Streamlit UI
Multi-modal fashion shopping assistant with conversational AI
"""

import html
import logging
import re
import uuid
from collections import OrderedDict
from pathlib import Path
from typing import Any, Optional

import streamlit as st
import streamlit.components.v1 as st_components
from PIL import Image, ImageOps

from app.agents.shopping_agent import ShoppingAgent
from app.search_registry import ProductItem, SearchResult, global_registry

# Matches [SEARCH_RESULTS_REF:sr_xxxxxxxx] tokens embedded in AI responses.
# Case-insensitive, optional spaces around the id.
SEARCH_RESULTS_REF_PATTERN = re.compile(r"\[SEARCH_RESULTS_REF:\s*([a-zA-Z0-9_]+)\s*\]", re.IGNORECASE)

# Configure logging
logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s - %(name)s - %(levelname)s - %(message)s",
)
logger = logging.getLogger(__name__)

# In-memory image cache (url or "local:path" -> PIL Image), max 100 entries
_IMAGE_CACHE: OrderedDict = OrderedDict()
_IMAGE_CACHE_MAX = 100

# Page config
st.set_page_config(
    page_title="ShopAgent",
    page_icon="👗",
    layout="centered",
    initial_sidebar_state="collapsed",
)

# Custom CSS - ChatGPT-like style
st.markdown(
    """
    <style>
    /* Show default Streamlit elements (sidebar toggle, etc.) */
    /* #MainMenu, footer, header no longer hidden */
    
    /* Body and root container */
    .main .block-container {
        padding-bottom: 180px !important;
        padding-top: 2rem;
        max-width: 900px;
        margin: 0 auto;
    }
    
    /* Fixed input container at bottom */
    .fixed-input-container {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        background: white;
        border-top: 1px solid #e5e5e5;
        padding: 1rem 0;
        z-index: 1000;
        box-shadow: 0 -2px 10px rgba(0,0,0,0.05);
    }
    
    .fixed-input-container .block-container {
        max-width: 900px;
        margin: 0 auto;
        padding: 0 1rem !important;
    }
    
    /* Message bubbles */
    .message {
        margin: 1rem 0;
        padding: 1rem 1.5rem;
        border-radius: 1rem;
        animation: fadeIn 0.3s ease-in;
    }
    
    @keyframes fadeIn {
        from { opacity: 0; transform: translateY(10px); }
        to { opacity: 1; transform: translateY(0); }
    }
    
    .user-message {
        background: transparent;
        margin: 0 0 1rem 0;
        padding: 0;
        border-radius: 0;
    }
    
    .assistant-message {
        background: white;
        border: 1px solid #e5e5e5;
        margin-right: 3rem;
    }
    
    /* Product cards - simplified */
    .stImage {
        border-radius: 0px;
        overflow: hidden;
    }
    
    .stImage img {
        transition: transform 0.2s;
    }
    
    .stImage:hover img {
        transform: scale(1.05);
    }
    
    /* Scroll to bottom behavior */
    html {
        scroll-behavior: smooth;
    }
    
    /* Header */
    .app-header {
        text-align: center;
        padding: 2rem 1rem;
        background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        color: white;
        border-radius: 1rem;
        margin-bottom: 2rem;
    }
    
    .app-title {
        font-size: 2rem;
        font-weight: 700;
        margin: 0;
    }
    
    .app-subtitle {
        font-size: 1rem;
        opacity: 0.9;
        margin-top: 0.5rem;
    }
    
    /* Welcome screen */
    .welcome-container {
        text-align: center;
        padding: 4rem 2rem;
        color: #666;
    }
    
    .welcome-title {
        font-size: 2rem;
        font-weight: 600;
        color: #1a1a1a;
        margin-bottom: 1rem;
    }
    
    .welcome-features {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 1.5rem;
        margin: 2rem 0;
    }
    
    .feature-card {
        background: #f7f7f8;
        padding: 1.5rem;
        border-radius: 12px;
        transition: all 0.2s;
    }
    
    .feature-card:hover {
        background: #efefef;
        transform: translateY(-2px);
    }
    
    .feature-icon {
        font-size: 2rem;
        margin-bottom: 0.5rem;
    }
    
    .feature-title {
        font-weight: 600;
        margin-bottom: 0.25rem;
    }
    
    /* Image preview */
    .image-preview {
        position: relative;
        display: inline-block;
        margin: 0.5rem 0;
    }
    
    .image-preview img {
        max-width: 200px;
        border-radius: 8px;
        border: 2px solid #e5e5e5;
    }
    
    .remove-image-btn {
        position: absolute;
        top: 5px;
        right: 5px;
        background: rgba(0,0,0,0.6);
        color: white;
        border: none;
        border-radius: 50%;
        width: 24px;
        height: 24px;
        cursor: pointer;
        font-size: 14px;
    }
    
    /* Buttons */
    .stButton>button {
        border-radius: 8px;
        border: 1px solid #e5e5e5;
        padding: 0.5rem 1rem;
        transition: all 0.2s;
    }
    
    .stButton>button:hover {
        background: #f0f0f0;
        border-color: #d0d0d0;
    }
    
    /* Hide upload button label */
    .uploadedFile {
        display: none;
    }

    /* Product card wrapper: hover reveals action bar */
    .product-card-wrapper {
        position: relative;
        border-radius: 8px;
        overflow: hidden;
        border: 1px solid #e5e5e5;
        background: #fff;
    }
    .product-card-actions {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 8px;
        padding: 6px 8px;
        background: rgba(0,0,0,0.04);
        border-top: 1px solid #eee;
        opacity: 0.85;
        transition: opacity 0.2s;
    }
    .product-card-wrapper:hover .product-card-actions {
        opacity: 1;
        background: rgba(0,0,0,0.06);
    }

    /* Right side drawer (off-canvas) */
    .side-drawer-backdrop {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0,0,0,0.35);
        z-index: 999998;
        transition: opacity 0.25s;
    }
    .side-drawer-panel {
        position: fixed;
        top: 56px;
        right: 0;
        width: 85%;
        max-width: 560px;
        height: calc(100vh - 56px);
        background: white;
        box-shadow: -4px 0 20px rgba(0,0,0,0.12);
        z-index: 999999;
        overflow-y: auto;
        transition: transform 0.25s ease-out;
    }
    .side-drawer-panel.open {
        transform: translateX(0);
    }
    .side-drawer-header {
        position: sticky;
        top: 0;
        background: white;
        border-bottom: 1px solid #e5e5e5;
        padding: 12px 16px;
        display: flex;
        align-items: center;
        justify-content: space-between;
        z-index: 1;
    }
    .side-drawer-content {
        padding: 14px 16px 20px 16px;
    }
    .side-drawer-backdrop,
    .side-drawer-panel {
        position: fixed !important;
    }
    #side-drawer-close-btn {
        display: inline-flex;
        align-items: center;
        gap: 4px;
        border: 1px solid #ccc;
        background: #f5f5f5;
        color: #333;
        font-size: 14px;
        font-weight: 500;
        padding: 6px 14px;
        border-radius: 8px;
        cursor: pointer;
    }
    #side-drawer-close-btn:hover {
        background: #e8e8e8;
        color: #111;
    }

    /* Bottom floating ask/compare bar */
    .bottom-actions-bar {
        position: fixed;
        bottom: 70px;
        left: 50%;
        transform: translateX(-50%);
        display: flex;
        align-items: center;
        gap: 12px;
        padding: 8px 16px;
        background: white;
        border: 1px solid #e5e5e5;
        border-radius: 24px;
        box-shadow: 0 2px 12px rgba(0,0,0,0.08);
        z-index: 1005;
        max-width: 90%;
    }
    .bottom-actions-bar .selected-count {
        font-size: 0.85rem;
        color: #666;
        margin-right: 4px;
    }
    </style>
    """,
    unsafe_allow_html=True,
)


# Initialize session state
def initialize_session():
    """Initialize session state variables"""
    if "session_id" not in st.session_state:
        st.session_state.session_id = str(uuid.uuid4())

    if "shopping_agent" not in st.session_state:
        st.session_state.shopping_agent = ShoppingAgent(
            session_id=st.session_state.session_id
        )

    if "messages" not in st.session_state:
        st.session_state.messages = []

    if "uploaded_image" not in st.session_state:
        st.session_state.uploaded_image = None

    if "show_image_upload" not in st.session_state:
        st.session_state.show_image_upload = False

    # Debug panel toggle (default True so 显示调试过程 is checked by default)
    if "show_debug" not in st.session_state:
        st.session_state.show_debug = True

    # Selected products for ask/compare (key -> product info dict)
    if "selected_products" not in st.session_state:
        st.session_state.selected_products = {}

    # Right side panel: visible, mode in ("similar", "compare"), payload (e.g. ref_id, query, or list of selected items)
    if "side_panel" not in st.session_state:
        st.session_state.side_panel = {
            "visible": False,
            "mode": None,
            "payload": None,
        }

    # Products currently referenced in chat input (list of product summary dicts)
    if "referenced_products" not in st.session_state:
        st.session_state.referenced_products = []


def save_uploaded_image(uploaded_file) -> Optional[str]:
    """Save uploaded image to temp directory"""
    if uploaded_file is None:
        return None

    try:
        temp_dir = Path("temp_uploads")
        temp_dir.mkdir(exist_ok=True)

        image_path = temp_dir / f"{st.session_state.session_id}_{uploaded_file.name}"
        with open(image_path, "wb") as f:
            f.write(uploaded_file.getbuffer())

        logger.info(f"Saved uploaded image to {image_path}")
        return str(image_path)

    except Exception as e:
        logger.error(f"Error saving uploaded image: {e}")
        st.error(f"Failed to save image: {str(e)}")
        return None


def _product_key(ref_id: str, index: int, product: ProductItem) -> str:
    """Stable unique key for a product in the session (for selection and side panel)."""
    return f"{ref_id}_{index}_{product.spu_id or index}"


def _product_to_info(product: ProductItem, ref_id: str) -> dict:
    """Serialize product to a small dict for selected_products and ask/compare."""
    return {
        "ref_id": ref_id,
        "spu_id": product.spu_id,
        "sku_id": product.spu_id,
        "title": product.title or "未知商品",
        "price": product.price,
        "tags": product.tags or [],
        "specifications": product.specifications or [],
    }


def _compact_field(value: Any) -> str:
    """Format a field into one readable line for chat reference payload."""
    if value is None:
        return "-"
    if isinstance(value, list):
        if not value:
            return "-"
        parts = []
        for item in value:
            if isinstance(item, dict):
                text = ", ".join(f"{k}:{v}" for k, v in item.items())
                parts.append(text if text else str(item))
            else:
                parts.append(str(item))
        return " | ".join(p for p in parts if p) or "-"
    return str(value)


def _build_reference_prefix(products: list[dict]) -> str:
    """Build backend prompt prefix for 'chat with referenced products'."""
    lines = [f"引用 {len(products)} 款商品："]
    for i, p in enumerate(products, 1):
        sku_id = _compact_field(p.get("sku_id") or p.get("spu_id"))
        title = _compact_field(p.get("title"))
        price = _compact_field(p.get("price"))
        tags = _compact_field(p.get("tags"))
        specifications = _compact_field(p.get("specifications"))
        lines.append(
            f"{i}. sku_id={sku_id}; title={title}; price={price}; "
            f"tags={tags}; specifications={specifications}"
        )
    return "\n".join(lines)


@st.fragment
def render_referenced_products_in_input() -> None:
    """Render referenced products above chat input, each with remove button."""
    refs = st.session_state.get("referenced_products", [])
    if not refs:
        return

    st.markdown("**已引用商品**")
    remove_idx = None
    for idx, item in enumerate(refs):
        with st.container(border=True):
            c1, c2 = st.columns([12, 1])
            with c1:
                title = (item.get("title") or "未知商品")[:80]
                st.markdown(f"**{title}**")
                st.caption(
                    f"sku_id={item.get('sku_id') or item.get('spu_id') or '-'}; "
                    f"price={_compact_field(item.get('price'))}; "
                    f"tags={_compact_field(item.get('tags'))}; "
                    f"specifications={_compact_field(item.get('specifications'))}"
                )
            with c2:
                if st.button("✕", key=f"remove_ref_{idx}", help="删除该引用"):
                    remove_idx = idx
    if remove_idx is not None:
        refs.pop(remove_idx)
        st.session_state.referenced_products = refs
        st.rerun()


def _load_product_image(product: ProductItem) -> Optional[Image.Image]:
    """Load product image with cache: image_url or local data/images. Cache key = url or 'local:path'."""
    cache_key: Optional[str] = None
    if product.image_url:
        cache_key = product.image_url
        if cache_key in _IMAGE_CACHE:
            _IMAGE_CACHE.move_to_end(cache_key)
            return _IMAGE_CACHE[cache_key]
        try:
            import io
            import requests
            resp = requests.get(product.image_url, timeout=10)
            if resp.status_code == 200:
                img = Image.open(io.BytesIO(resp.content))
                _IMAGE_CACHE[cache_key] = img
                _IMAGE_CACHE.move_to_end(cache_key)
                if len(_IMAGE_CACHE) > _IMAGE_CACHE_MAX:
                    _IMAGE_CACHE.popitem(last=False)
                return img
        except Exception as e:
            logger.debug(f"Remote image fetch failed for {product.spu_id}: {e}")

    local = Path(f"data/images/{product.spu_id}.jpg")
    if local.exists():
        cache_key = f"local:{local}"
        if cache_key in _IMAGE_CACHE:
            _IMAGE_CACHE.move_to_end(cache_key)
            return _IMAGE_CACHE[cache_key]
        try:
            img = Image.open(local)
            _IMAGE_CACHE[cache_key] = img
            _IMAGE_CACHE.move_to_end(cache_key)
            if len(_IMAGE_CACHE) > _IMAGE_CACHE_MAX:
                _IMAGE_CACHE.popitem(last=False)
            return img
        except Exception as e:
            logger.debug(f"Local image load failed {local}: {e}")
    return None


def display_product_card_from_item(
    product: ProductItem,
    ref_id: str,
    index: int,
    widget_prefix: str = "",
) -> None:
    """Render a single product card with hover actions: Similar products + checkbox."""
    pkey = _product_key(ref_id, index, product)
    key_suffix = f"{widget_prefix}_{pkey}" if widget_prefix else pkey
    info = _product_to_info(product, ref_id)
    selected = st.session_state.selected_products

    st.markdown('<div class="product-card-wrapper">', unsafe_allow_html=True)

    img = _load_product_image(product)
    if img:
        target = (220, 220)
        try:
            img = ImageOps.fit(img, target, method=Image.Resampling.LANCZOS)
        except AttributeError:
            img = ImageOps.fit(img, target, method=Image.LANCZOS)
        st.image(img, width="stretch")
    else:
        st.markdown(
            '<div style="height:120px;background:#f5f5f5;border-radius:6px;'
            'display:flex;align-items:center;justify-content:center;'
            'color:#bbb;font-size:2rem;">🛍️</div>',
            unsafe_allow_html=True,
        )

    title = product.title or "未知商品"
    st.markdown(f"**{title[:40]}**" + ("…" if len(title) > 40 else ""))

    if product.price is not None:
        st.caption(f"¥{product.price:.2f}")

    label_style = "⭐" if product.match_label == "Relevant" else "✦"
    st.caption(f"{label_style} {product.match_label}")

    st.markdown('<div class="product-card-actions">', unsafe_allow_html=True)
    col_a, col_b = st.columns([1, 1])
    with col_a:
        similar_clicked = st.button(
            "Similar products",
            key=f"similar_{key_suffix}",
            help="Search by this product title and show in side panel",
        )
    with col_b:
        is_checked = st.checkbox(
            "Select",
            key=f"select_{key_suffix}",
            value=(pkey in selected),
            label_visibility="collapsed",
        )
    st.markdown("</div>", unsafe_allow_html=True)
    st.markdown("</div>", unsafe_allow_html=True)

    if similar_clicked:
        search_query = (product.title or "").strip() or "商品"
        st.session_state.side_panel = {
            "visible": True,
            "mode": "similar",
            "payload": {"query": search_query, "loading": True},
        }
        st.rerun()

    if is_checked:
        if pkey not in selected:
            selected[pkey] = info
    else:
        selected.pop(pkey, None)


def render_search_result_block(result: SearchResult, widget_prefix: str = "") -> None:
    """
    Render a full search result block in place of a [SEARCH_RESULTS_REF:ref_id] token.

    widget_prefix: unique per (message, ref block) so Streamlit widget keys stay unique.
    """
    summary_line = f' &nbsp;·&nbsp;{result.quality_summary}' if result.quality_summary else ''
    header_html = (
        f'<div style="border:1px solid #e0e0e0;border-radius:8px;padding:10px 14px;'
        f'margin:8px 0 4px 0;background:#fafafa;">'
        f'<span style="font-size:0.8rem;color:#555;">'
        f'🔍 <b>{result.query}</b>'
        f'&nbsp;·&nbsp;Relevant&nbsp;{result.perfect_count}&nbsp;件'
        f'&nbsp;·&nbsp;Partially Relevant&nbsp;{result.partial_count}&nbsp;件'
        f'{summary_line}'
        f'</span></div>'
    )
    st.markdown(header_html, unsafe_allow_html=True)

    # Perfect matches first, fall back to partials if none
    perfect = [p for p in result.products if p.match_label == "Relevant"]
    partial = [p for p in result.products if p.match_label == "Partially Relevant"]
    to_show = (perfect + partial)[:6] if perfect else partial[:6]

    if not to_show:
        st.caption("（本次搜索未找到可展示的商品）")
        return

    cols = st.columns(min(len(to_show), 3))
    for i, product in enumerate(to_show):
        with cols[i % 3]:
            display_product_card_from_item(
                product, result.ref_id, i, widget_prefix=widget_prefix
            )


def render_message_with_refs(
    content: str,
    session_id: str,
    fallback_refs: Optional[dict] = None,
    msg_index: int = 0,
) -> None:
    """
    Render an assistant message that may contain [SEARCH_RESULTS_REF:ref_id] tokens.

    msg_index: message index in chat, used to keep widget keys unique across messages.
    """
    fallback_refs = fallback_refs or {}
    parts = SEARCH_RESULTS_REF_PATTERN.split(content)

    for i, segment in enumerate(parts):
        if i % 2 == 0:
            text = segment.strip()
            if text:
                st.markdown(text)
        else:
            ref_id = segment.strip()
            result = global_registry.get(session_id, ref_id) or fallback_refs.get(ref_id)
            if result:
                widget_prefix = f"m{msg_index}_r{i}"
                render_search_result_block(result, widget_prefix=widget_prefix)
            else:
                st.caption(f"[搜索结果 {ref_id} 不可用]")


def render_debug_steps_panel(debug_steps: list[dict], expanded: bool = True) -> None:
    """Render debug steps with thinking/tool details."""
    with st.expander("思考 & 工具调用详细过程", expanded=expanded):
        for idx, step in enumerate(debug_steps, 1):
            node = step.get("node", "unknown")
            st.markdown(f"**Step {idx} – {node}**")

            if node == "agent":
                msgs = step.get("messages", [])
                if msgs:
                    st.markdown("**Agent Messages**")
                    for m in msgs:
                        st.markdown(f"- `{m.get('type', 'assistant')}`: {m.get('content', '')}")
                        if m.get("thinking"):
                            st.markdown("  - `thinking`:")
                            st.code(m.get("thinking", ""), language="text")

                tcs = step.get("tool_calls", [])
                if tcs:
                    st.markdown("**Planned Tool Calls**")
                    for j, tc in enumerate(tcs, 1):
                        st.markdown(f"- **{j}. {tc.get('name')}**")
                        st.code(tc.get("args", {}), language="json")

            elif node == "tools":
                results = step.get("results", [])
                if results:
                    st.markdown("**Tool Results**")
                    for j, r in enumerate(results, 1):
                        st.markdown(f"- **Result {j}:**")
                        st.code(r.get("content", ""), language="text")

            st.markdown("---")


def display_message(message: dict, msg_index: int = 0):
    """Display a chat message. msg_index keeps widget keys unique across messages."""
    role = message["role"]
    content = message["content"]
    image_path = message.get("image_path")
    tool_calls = message.get("tool_calls", [])
    debug_steps = message.get("debug_steps", [])

    if role == "user":
        st.markdown('<div class="message user-message">', unsafe_allow_html=True)

        if image_path and Path(image_path).exists():
            try:
                img = Image.open(image_path)
                st.image(img, width=200)
            except Exception:
                logger.warning(f"Failed to load user uploaded image: {image_path}")

        st.markdown(content)
        st.markdown("</div>", unsafe_allow_html=True)

    else:  # assistant
        # Tool call breadcrumb
        if tool_calls:
            tool_names = [tc["name"] for tc in tool_calls]
            st.caption(" → ".join(tool_names))
            st.markdown("")

        # Debug panel
        if debug_steps and st.session_state.get("show_debug"):
            render_debug_steps_panel(debug_steps, expanded=True)

        # Render message: expand [SEARCH_RESULTS_REF:ref_id] tokens into product card blocks
        session_id = st.session_state.get("session_id", "")
        render_message_with_refs(
            content, session_id, fallback_refs=message.get("search_refs"), msg_index=msg_index
        )

        st.markdown("</div>", unsafe_allow_html=True)


@st.fragment
def render_bottom_actions_bar() -> None:
    """Show Ask and Compare when there are selected products. Disabled when none selected."""
    selected = st.session_state.selected_products
    n = len(selected)
    if n == 0:
        return
    st.markdown(
        '<div class="bottom-actions-bar">',
        unsafe_allow_html=True,
    )
    col_sel, col_ask, col_cmp = st.columns([2, 1, 1])
    with col_sel:
        st.caption(f"Selected: {n}")
    with col_ask:
        ask_clicked = st.button("Ask", key="bottom_ask", help="Continue conversation with selected products")
    with col_cmp:
        compare_clicked = st.button("Compare", key="bottom_compare", help="Compare selected products")
    st.markdown("</div>", unsafe_allow_html=True)

    if ask_clicked:
        st.session_state.referenced_products = list(selected.values())
        st.rerun()
    if compare_clicked:
        st.session_state.side_panel = {
            "visible": True,
            "mode": "compare",
            "payload": list(selected.values()),
        }
        st.rerun()


def render_side_drawer() -> None:
    """Render a fixed overlay side drawer that does not change background layout."""
    panel = st.session_state.side_panel
    if not panel.get("visible") or not panel.get("mode"):
        return

    mode = panel["mode"]
    payload = panel.get("payload") or {}
    session_id = st.session_state.get("session_id", "")

    title = "Similar products" if mode == "similar" else "Compare"
    body_html = ""

    if mode == "similar":
        query = html.escape((payload.get("query") or ""))
        if payload.get("loading"):
            body_html = '<p style="color:#666;">加载中…</p>'
        elif payload.get("products") is not None:
            to_show = payload["products"][:12]
            cards = []
            for product in to_show:
                p_title = html.escape((product.title or "未知商品")[:80])
                price = (
                    f"¥{product.price:.2f}"
                    if product.price is not None
                    else "价格待更新"
                )
                image_html = (
                    f'<img src="{html.escape(product.image_url)}" alt="{p_title}" '
                    'style="width:64px;height:64px;object-fit:cover;border-radius:8px;border:1px solid #eee;" />'
                    if product.image_url
                    else '<div style="width:64px;height:64px;background:#f5f5f5;border-radius:8px;'
                    'display:flex;align-items:center;justify-content:center;color:#bbb;">🛍️</div>'
                )
                cards.append(
                    '<div style="display:flex;gap:10px;border:1px solid #eee;border-radius:10px;'
                    'padding:10px;background:#fff;">'
                    f"{image_html}"
                    '<div style="flex:1;min-width:0;">'
                    f'<div style="font-weight:600;color:#111;line-height:1.35;">{p_title}</div>'
                    f'<div style="font-size:0.9rem;color:#555;margin-top:4px;">{price}</div>'
                    "</div></div>"
                )
            cards_html = "".join(cards) if cards else '<p style="color:#666;">（未找到可展示的商品）</p>'
            body_html = (
                f'<div style="font-size:0.92rem;color:#555;margin-bottom:10px;">'
                f'基于「{query}」的搜索结果：</div>'
                '<div style="display:grid;gap:10px;">' + cards_html + "</div>"
            )
        else:
            # Legacy: ref_id from registry (e.g. from chat)
            ref_id = payload.get("ref_id")
            if ref_id:
                result = global_registry.get(session_id, ref_id)
                if result:
                    to_show = (result.products or [])[:12]
                    cards = []
                    for product in to_show:
                        p_title = html.escape((product.title or "未知商品")[:80])
                        price = f"¥{product.price:.2f}" if product.price is not None else "价格待更新"
                        image_html = (
                            f'<img src="{html.escape(product.image_url)}" alt="{p_title}" '
                            'style="width:64px;height:64px;object-fit:cover;border-radius:8px;border:1px solid #eee;" />'
                            if product.image_url
                            else '<div style="width:64px;height:64px;background:#f5f5f5;border-radius:8px;display:flex;align-items:center;justify-content:center;color:#bbb;">🛍️</div>'
                        )
                        cards.append(
                            '<div style="display:flex;gap:10px;border:1px solid #eee;border-radius:10px;padding:10px;background:#fff;">'
                            f"{image_html}"
                            f'<div style="flex:1;min-width:0;"><div style="font-weight:600;color:#111;">{p_title}</div>'
                            f'<div style="font-size:0.9rem;color:#555;">{price}</div></div></div>'
                        )
                    body_html = (
                        f'<div style="font-size:0.92rem;color:#555;margin-bottom:10px;">基于「{query}」的搜索结果：</div>'
                        '<div style="display:grid;gap:10px;">' + "".join(cards) + "</div>"
                    )
                else:
                    body_html = f'<p style="color:#666;">[搜索结果 {html.escape(ref_id)} 不可用]</p>'
            else:
                body_html = '<p style="color:#666;">搜索失败或暂无结果。</p>'
    else:
        items = payload if isinstance(payload, list) else []
        if items:
            rows = []
            for item in items:
                t = html.escape((item.get("title") or "未知商品")[:80])
                p = item.get("price")
                ptext = f"¥{p:.2f}" if p is not None else "价格待更新"
                rows.append(
                    '<div style="border:1px solid #eee;border-radius:10px;padding:10px;background:#fff;">'
                    f'<div style="font-weight:600;color:#111;">{t}</div>'
                    f'<div style="font-size:0.9rem;color:#555;margin-top:4px;">{ptext}</div>'
                    "</div>"
                )
            items_html = "".join(rows)
        else:
            items_html = '<p style="color:#666;">当前未选中商品。</p>'
        body_html = (
            '<div style="margin-bottom:10px;color:#555;">已选商品：</div>'
            f'<div style="display:grid;gap:10px;">{items_html}</div>'
            '<div style="margin-top:14px;padding:10px 12px;border-radius:8px;'
            'background:#fff3cd;color:#856404;">对比功能暂未实现。</div>'
        )

    st.markdown(
        f"""
        <div class="side-drawer-backdrop" id="side-drawer-backdrop"></div>
        <div class="side-drawer-panel open" id="side-drawer-panel">
            <div class="side-drawer-header">
                <div style="font-weight:600;">{html.escape(title)}</div>
                <button id="side-drawer-close-btn">✕ 关闭</button>
            </div>
            <div class="side-drawer-content">
                {body_html}
            </div>
        </div>
        """,
        unsafe_allow_html=True,
    )

    st_components.html("""
    <script>
    (function() {
        var pd = window.parent.document;
        var btn = pd.getElementById('side-drawer-close-btn');
        var backdrop = pd.getElementById('side-drawer-backdrop');
        var panel = pd.getElementById('side-drawer-panel');
        function closeDrawer() {
            if (backdrop) backdrop.style.display = 'none';
            if (panel) panel.style.display = 'none';
            var url = new URL(window.parent.location);
            url.searchParams.set('close_side_panel', '1');
            window.parent.history.replaceState({}, '', url);
        }
        if (btn) btn.onclick = closeDrawer;
        if (backdrop) backdrop.onclick = closeDrawer;
    })();
    </script>
    """, height=0)


def display_welcome():
    """Display welcome screen"""
    col1, col2, col3, col4 = st.columns(4)
    with col1:
        st.markdown(
            """
            <div class="feature-card">
                <div class="feature-icon">💗</div>
                <div class="feature-title">懂你</div>
                <div>能记住你的偏好，给你推荐适合的</div>
            </div>
            """,
            unsafe_allow_html=True,
        )

    with col2:
        st.markdown(
            """
            <div class="feature-card">
                <div class="feature-icon">🛍️</div>
                <div class="feature-title">懂商品</div>
                <div>深度理解店铺内所有商品，智能匹配你的需求</div>
            </div>
            """,
            unsafe_allow_html=True,
        )

    with col3:
        st.markdown(
            """
            <div class="feature-card">
                <div class="feature-icon">💭</div>
                <div class="feature-title">贴心</div>
                <div>任意聊</div>
            </div>
            """,
            unsafe_allow_html=True,
        )

    with col4:
        st.markdown(
            """
            <div class="feature-card">
                <div class="feature-icon">👗</div>
                <div class="feature-title">懂时尚</div>
                <div>穿搭顾问 + 轻松对比</div>
            </div>
            """,
            unsafe_allow_html=True,
        )

    st.markdown("<br><br>", unsafe_allow_html=True)

def main():
    """Main Streamlit app"""
    initialize_session()
    # Sync drawer close state from JS (set by JS via history.replaceState, no reload)
    if st.query_params.get("close_side_panel"):
        st.session_state.side_panel = {"visible": False, "mode": None, "payload": None}
        st.query_params.clear()

    # "Similar" panel: if loading, run API-only search and rerun
    panel = st.session_state.side_panel
    if panel.get("visible") and panel.get("mode") == "similar":
        payload = panel.get("payload") or {}
        if payload.get("loading") and payload.get("query"):
            from app.tools.search_tools import search_products_api_only
            products = search_products_api_only(payload["query"], limit=12)
            st.session_state.side_panel["payload"] = {
                "query": payload["query"],
                "products": products,
                "loading": False,
            }
            st.rerun()

    # Drawer rendered early so fixed positioning works from top of DOM
    render_side_drawer()

    # Header
    st.markdown(
        """
        <div class="app-header">
            <div class="app-title">👗 ShopAgent</div>
            <div class="app-subtitle">AI Fashion Shopping Assistant</div>
        </div>
        """,
        unsafe_allow_html=True,
    )

    # Sidebar (collapsed by default, but accessible)
    @st.fragment
    def _sidebar_fragment():
        st.markdown("### ⚙️ Settings")
        if st.button("🗑️ Clear Chat", width="stretch"):
            if "shopping_agent" in st.session_state:
                st.session_state.shopping_agent.clear_history()
            session_id = st.session_state.get("session_id", "")
            if session_id:
                global_registry.clear_session(session_id)
            st.session_state.messages = []
            st.session_state.uploaded_image = None
            st.session_state.selected_products = {}
            st.session_state.referenced_products = []
            st.session_state.side_panel = {"visible": False, "mode": None, "payload": None}
            st.rerun()
        st.markdown("---")
        st.checkbox(
            "显示调试过程 (debug)",
            key="show_debug",
            value=True,
            help="展开后可查看中间思考过程及工具调用详情",
        )
        st.markdown("---")
        st.caption(f"Session: `{st.session_state.session_id[:8]}...`")

    with st.sidebar:
        _sidebar_fragment()

    MAX_MESSAGES = 50
    messages_container = st.container()
    with messages_container:
        if not st.session_state.messages:
            display_welcome()
        else:
            messages = st.session_state.messages
            start_idx = max(0, len(messages) - MAX_MESSAGES)
            to_show = messages[start_idx:]
            if len(messages) > MAX_MESSAGES:
                st.caption(f"（仅显示最近 {MAX_MESSAGES} 条，共 {len(messages)} 条消息）")
            for i, message in enumerate(to_show):
                display_message(message, msg_index=start_idx + i)
    render_bottom_actions_bar()

    # Fixed input area at bottom (using container to simulate fixed position)
    st.markdown('<div class="fixed-input-container">', unsafe_allow_html=True)

    input_container = st.container()

    with input_container:
        # Image upload area (shown when + is clicked)
        if st.session_state.show_image_upload:
            uploaded_file = st.file_uploader(
                "Choose an image",
                type=["jpg", "jpeg", "png"],
                key="file_uploader",
            )

            if uploaded_file:
                st.session_state.uploaded_image = uploaded_file
                # Show preview
                col1, col2 = st.columns([1, 4])
                with col1:
                    img = Image.open(uploaded_file)
                    st.image(img, width=100)
                with col2:
                    if st.button("❌ Remove"):
                        st.session_state.uploaded_image = None
                        st.session_state.show_image_upload = False
                        st.rerun()

        # Referenced products area (shown above chat input, each can be removed)
        render_referenced_products_in_input()

        # Input row
        col1, col2 = st.columns([1, 12])

        with col1:
            # Image upload toggle button
            if st.button("➕", help="Add image", width="stretch"):
                st.session_state.show_image_upload = (
                    not st.session_state.show_image_upload
                )
                st.rerun()

        with col2:
            # Text input
            user_query = st.chat_input(
                "Ask about fashion products...",
                key="chat_input",
            )

    st.markdown("</div>", unsafe_allow_html=True)

    # Process user input
    if user_query:
        raw_user_query = user_query
        referenced_products = list(st.session_state.get("referenced_products", []))
        agent_query = raw_user_query
        if referenced_products:
            agent_query = f"{_build_reference_prefix(referenced_products)}\n\n{raw_user_query}"

        # Ensure shopping agent is initialized
        if "shopping_agent" not in st.session_state:
            st.error("Session not initialized. Please refresh the page.")
            st.stop()

        # Save uploaded image if present, or get from recent history
        image_path = None
        if st.session_state.uploaded_image:
            # User explicitly uploaded an image for this query
            image_path = save_uploaded_image(st.session_state.uploaded_image)
        else:
            # Check if query refers to a previous image
            if any(
                ref in raw_user_query.lower()
                for ref in [
                    "this",
                    "that",
                    "the image",
                    "the shirt",
                    "the product",
                    "it",
                ]
            ):
                # Find the most recent message with an image
                for msg in reversed(st.session_state.messages):
                    if msg.get("role") == "user" and msg.get("image_path"):
                        image_path = msg["image_path"]
                        logger.info(f"Using image from previous message: {image_path}")
                        break

        # Add user message
        st.session_state.messages.append(
            {
                "role": "user",
                "content": raw_user_query,
                "image_path": image_path,
            }
        )

        # References are consumed once this message is sent
        st.session_state.referenced_products = []

        # Display user message immediately
        with messages_container:
            display_message(st.session_state.messages[-1])

        # Process with shopping agent
        try:
            shopping_agent = st.session_state.shopping_agent

            # Stream assistant updates to UI immediately
            with messages_container:
                live_container = st.container()
                with live_container:
                    live_tool_caption = st.empty()
                    live_debug_placeholder = st.empty()
                    live_response_placeholder = st.empty()

            live_response = ""
            live_tool_calls: list[dict] = []
            live_debug_steps: list[dict] = []
            result = None

            def _render_live() -> None:
                if live_tool_calls:
                    tool_names = [tc.get("name", "") for tc in live_tool_calls if tc.get("name")]
                    live_tool_caption.caption(" → ".join(tool_names))
                else:
                    live_tool_caption.empty()

                if st.session_state.get("show_debug") and live_debug_steps:
                    with live_debug_placeholder.container():
                        render_debug_steps_panel(live_debug_steps, expanded=True)
                else:
                    live_debug_placeholder.empty()

                if live_response:
                    live_response_placeholder.markdown(live_response)
                else:
                    live_response_placeholder.markdown("…")

            for event in shopping_agent.chat_stream(query=agent_query, image_path=image_path):
                event_type = event.get("type")
                if event_type in {"debug_update", "response_delta", "response_replace"}:
                    if "tool_calls" in event:
                        live_tool_calls = event.get("tool_calls", live_tool_calls)
                    if "debug_steps" in event:
                        live_debug_steps = event.get("debug_steps", live_debug_steps)
                    if event_type == "response_delta":
                        live_response = event.get("response", live_response)
                    elif event_type == "response_replace":
                        live_response = event.get("response", live_response)
                    _render_live()
                elif event_type == "done":
                    result = event.get("result")

            if not result:
                result = {
                    "response": live_response or "抱歉，处理您的请求时未返回结果。",
                    "tool_calls": live_tool_calls,
                    "debug_steps": live_debug_steps,
                    "search_refs": {},
                    "error": True,
                }

            response = result["response"]
            tool_calls = result.get("tool_calls", [])
            debug_steps = result.get("debug_steps", [])

            # Add assistant message (store search_refs so refs resolve after rerun)
            st.session_state.messages.append(
                {
                    "role": "assistant",
                    "content": response,
                    "tool_calls": tool_calls,
                    "debug_steps": debug_steps,
                    "search_refs": result.get("search_refs", {}),
                }
            )

            # Clear uploaded image and hide upload area after sending
            st.session_state.uploaded_image = None
            st.session_state.show_image_upload = False

            # Auto-scroll to bottom with JavaScript
            st.markdown(
                """
                <script>
                window.scrollTo(0, document.body.scrollHeight);
                </script>
                """,
                unsafe_allow_html=True,
            )

        except Exception as e:
            logger.error(f"Error processing query: {e}", exc_info=True)
            error_msg = f"I apologize, I encountered an error: {str(e)}"

            st.session_state.messages.append(
                {
                    "role": "assistant",
                    "content": error_msg,
                }
            )

        # Rerun to update UI
        st.rerun()


if __name__ == "__main__":
    main()
