import os
import requests
import streamlit as st
from google.auth.transport.requests import Request
from google.oauth2.id_token import fetch_id_token


BACKEND_URL = os.getenv('BACKEND_URL', 'http://localhost:8080')


def get_start_end_seconds(timestamp):
    """
    04:57-05:58 のような形式のタイムスタンプを受け取り、
    開始秒と終了秒をタプルで返す
    """
    start, end = timestamp.split('-')
    start_mm, start_ss = start.split(':')
    end_mm, end_ss = end.split(':')
    start_seconds = int(start_mm) * 60 + int(start_ss)
    end_seconds = int(end_mm) * 60 + int(end_ss)
    return start_seconds, end_seconds


def make_request(endpoint: str, params: dict = None):
    """Backend API に認証情報を付与してリクエストを送信する"""
    auth_req = Request()
    id_token = fetch_id_token(auth_req, BACKEND_URL)
    headers = {'Authorization': f'Bearer {id_token}'}
    response = requests.get(
        f'{BACKEND_URL}/{endpoint}', params=params, headers=headers)
    response.raise_for_status()  # Raise error on error status code
    return response.json()


def file_search():
    st.write('# File Search')
    file_search_query = st.text_input('Search Query', key='file_search')
    if st.button('Search', key='file_search_button'):
        st.write(f'Searching for: {file_search_query}')
        if file_search_query:
            try:
                results = make_request(
                    'file_search', params={'query': file_search_query})['results']
                if results:
                    st.write('## Result')
                    for c, result in enumerate(results):
                        if c == 0:
                            st.write(result['summary'])
                            continue
                        st.write(f"Video ID: {result['id']}")
                        st.write(f"Title: {result['title']}")
                        st.video(result['signed_url'])
                        st.divider()
                else:
                    st.write('No results found.')
            except requests.exceptions.RequestException as e:
                st.error(f'An error occurred while searching: {e}')


def scene_search():
    st.write('# Scene Search')
    
    # Show "Search Query" and "Top N" in a single row
    col1, col2 = st.columns((7, 1))
    with col1:
        scene_search_query = st.text_input('Search Query', key='scene_search')
    with col2:
        top_n = st.number_input(
            'Top N', min_value=1, max_value=3, value=1,
            help='Top N とは ... シーンの検索対象最大動画数'
                 '\n\n'
                 'まず検索文の回答に適した動画が全動画を対象に検索され\n'
                 'その後、上位 N 個の動画からシーンが検索されます。'
        )

    if st.button('Search', key='scene_search_button'):
        st.write(f'Searching for: {scene_search_query}')
        if scene_search_query:
            try:
                results = make_request(
                    'scene_search',
                    params={'query': scene_search_query, 'top_n': top_n})['results']
                if results:
                    st.write('## Result')
                    for c, result in enumerate(results):
                        video_id = c + 1
                        st.write(f'Video ID: {video_id}')
                        st.write(f"Title: {result['title']}")
                        st.write(f"Description: {result['Description']}")
                        st.write(f"Timestamp: {result['Timestamp']}")
                        start_time, end_time = get_start_end_seconds(result['Timestamp'])
                        signed_url = result['signed_url']
                        st.video(signed_url, start_time=start_time, end_time=end_time)
                        st.divider()
                else:
                    st.write('No results found.')
            except requests.exceptions.RequestException as e:
                st.error(f'An error occurred while searching: {e}')


# __main__

# Search options
search_option = st.selectbox('Search Option', ('File Search', 'Scene Search'))

if search_option == 'File Search':
    file_search()
elif search_option == 'Scene Search':
    scene_search()