# utils/tab2_search_video.py

import streamlit as st
import os
from pathlib import Path
from utils.helpers import  analyze_ass_for_keywords, search_pixabay_videos, search_pexels_videos
from utils.helpers import  display_operation_status

@st.fragment
def render_tab(project,callbacks):
    """一個用於從多個來源搜尋並下載影片的獨立UI片段。"""
    display_operation_status
    paths = project.paths
    st.header("從線上圖庫搜尋影片素材")
    pixabay_api_key = st.secrets.get("PIXABAY_API_KEY")
    pexels_api_key = st.secrets.get("PEXELS_API_KEY")

    if not pixabay_api_key and not pexels_api_key:
        st.warning("請至少在 Streamlit secrets 中設定 `PIXABAY_API_KEY` 或 `PEXELS_API_KEY` 以使用此功能。")
        return

    st.subheader("搜尋影片")

    # 【新增】影片來源選擇
    available_sources = []
    if pixabay_api_key: available_sources.append("Pixabay")
    if pexels_api_key: available_sources.append("Pexels")
    
    if not available_sources:
        st.session_state.operation_status = {
            "success": False, 
            "message": "沒有可用的影片來源 API 金鑰。"
        }        
        return

    source_choice = st.radio(
        "選擇影片來源:",
        options=available_sources,
        horizontal=True,
        key="video_source_choice"
    )

    keywords = analyze_ass_for_keywords(paths)
    default_query = keywords[0] if keywords else ""
    
    with st.form(key="search_form"):
        col1, col2 = st.columns([4, 1])
        with col1:
            st.text_input(
                "Search Videos", 
                value=default_query,
                key="search_query_input", 
                placeholder="輸入關鍵字後按 Enter 或點擊右側按鈕搜尋",
                label_visibility="collapsed"
            )
        with col2:
            submitted = st.form_submit_button("🔍 搜尋影片", use_container_width=True)

    if submitted:
        with st.spinner("正在搜尋並過濾影片..."):
            query = st.session_state.get("search_query_input", "")
            
            # 【修改】根據選擇呼叫對應的 API
            if source_choice == "Pixabay":
                success, message, results = search_pixabay_videos(pixabay_api_key, query)
            elif source_choice == "Pexels":
                success, message, results = search_pexels_videos(pexels_api_key, query)
            else:
                success, message, results = False, "未知的影片來源", []

            st.session_state.operation_status = {"success": success, "message": message, "source": "search_videos"}
            
            # --- 【修改】資料標準化 ---
            standardized_results = []
            if success and results:
                if source_choice == "Pixabay":
                    for v in results:
                        try:
                            standardized_results.append({
                                'id': f"pixabay-{v['id']}",
                                'thumbnail_url': v['videos']['tiny']['thumbnail'],
                                'video_url': v['videos']['large']['url'],
                                'preview_url': v['videos']['tiny']['url'],
                                'width': v['videos']['large']['width'],
                                'height': v['videos']['large']['height']
                            })
                        except KeyError: continue
                elif source_choice == "Pexels":
                    for v in results:
                        try:
                            # 尋找合適的影片檔案連結
                            video_link_hd = next((f['link'] for f in v['video_files'] if f.get('quality') == 'hd'), None)
                            video_link_sd = next((f['link'] for f in v['video_files'] if f.get('quality') == 'sd'), None)
                            
                            # 優先使用 HD 畫質，若無則用 SD，再沒有就用第一個
                            final_video_url = video_link_hd or video_link_sd or v['video_files'][0]['link']
                            
                            standardized_results.append({
                                'id': f"pexels-{v['id']}",
                                'thumbnail_url': v['image'],
                                'video_url': final_video_url,
                                'preview_url': video_link_sd or final_video_url, # 預覽用 SD 或更高畫質
                                'width': v['width'],
                                'height': v['height']
                            })
                        except (KeyError, IndexError): continue
            
            st.session_state.search_results = standardized_results
            st.session_state.selected_videos = {str(v['id']): {"url": v['video_url'], "selected": False} for v in standardized_results}
            st.session_state.active_preview_id = None
    
    if keywords and (keywords[1] or keywords[2]):
        st.caption(f"建議關鍵字: `{keywords[1]}` `{keywords[2]}`")

    st.divider()

    if st.session_state.search_results:
        st.subheader("選擇影片並下載")
        st.button("📥 下載選取的影片到專案素材庫", on_click=callbacks.callback_download_videos, args=(paths,), help="將下方勾選的影片下載至目前專案的 `output/temp_video` 資料夾，並自動循序命名。")
 
        num_cols = 5
        cols = st.columns(num_cols)
        # 【修改】使用標準化後的結果進行渲染
        for i, video in enumerate(st.session_state.search_results):
            with cols[i % num_cols]:
                with st.container(border=True):
                    media_placeholder = st.empty()
                    video_id_str = str(video['id'])
                    
                    if st.session_state.active_preview_id == video_id_str:
                        media_placeholder.video(video['preview_url'])
                        preview_button_text, preview_button_type = "⏹️ 停止預覽", "secondary"
                    else:
                        media_placeholder.image(video['thumbnail_url'], use_container_width=True)
                        preview_button_text, preview_button_type = "▶️ 預覽", "primary"
                    
                    st.caption(f"ID: {video_id_str}")
                    st.caption(f"尺寸: {video['width']}x{video['height']}")
                        
                    is_selected = st.checkbox("選取", key=f"select_{video_id_str}", value=st.session_state.selected_videos.get(video_id_str, {}).get('selected', False))
                    if video_id_str in st.session_state.selected_videos:
                        st.session_state.selected_videos[video_id_str]['selected'] = is_selected
                        
                    st.button(preview_button_text, key=f"preview_{video_id_str}", on_click=callbacks.callback_toggle_preview, args=(video_id_str,), use_container_width=True, type=preview_button_type)