imetting_backend/app/api/endpoints/meetings.py

from fastapi import APIRouter, HTTPException, UploadFile, File, Form
from app.models.models import Meeting, TranscriptSegment, CreateMeetingRequest, UpdateMeetingRequest, SpeakerTagUpdateRequest, BatchSpeakerTagUpdateRequest, TranscriptUpdateRequest, BatchTranscriptUpdateRequest
from app.core.database import get_db_connection
from app.core.config import BASE_DIR, UPLOAD_DIR, AUDIO_DIR, MARKDOWN_DIR, ALLOWED_EXTENSIONS, ALLOWED_IMAGE_EXTENSIONS, MAX_FILE_SIZE, MAX_IMAGE_SIZE
from app.services.qiniu_service import qiniu_service
from app.services.llm_service import LLMService
from typing import Optional
from pydantic import BaseModel
import os
import uuid
import shutil

router = APIRouter()

# 实例化LLM服务
llm_service = LLMService()

# 请求模型
class GenerateSummaryRequest(BaseModel):
    user_prompt: Optional[str] = ""

@router.get("/meetings", response_model=list[Meeting])
def get_meetings(user_id: Optional[int] = None):
    with get_db_connection() as connection:
        cursor = connection.cursor(dictionary=True)
        
        base_query = '''
            SELECT 
                m.meeting_id, m.title, m.meeting_time, m.summary, m.created_at, 
                m.user_id as creator_id, u.caption as creator_username
            FROM meetings m
            JOIN users u ON m.user_id = u.user_id
        '''
        
        if user_id:
            query = f'''
            {base_query}
            LEFT JOIN attendees a ON m.meeting_id = a.meeting_id
            WHERE m.user_id = %s OR a.user_id = %s
            GROUP BY m.meeting_id
            ORDER BY m.meeting_time DESC, m.created_at DESC
            '''
            cursor.execute(query, (user_id, user_id))
        else:
            query = f" {base_query} ORDER BY m.meeting_time DESC, m.created_at DESC"
            cursor.execute(query)
        
        meetings = cursor.fetchall()
        
        meeting_list = []
        for meeting in meetings:
            attendees_query = '''
            SELECT u.user_id, u.caption
            FROM attendees a
            JOIN users u ON a.user_id = u.user_id
            WHERE a.meeting_id = %s
            '''
            cursor.execute(attendees_query, (meeting['meeting_id'],))
            attendees_data = cursor.fetchall()
            attendees = [{'user_id': row['user_id'], 'caption': row['caption']} for row in attendees_data]
            
            meeting_list.append(Meeting(
                meeting_id=meeting['meeting_id'],
                title=meeting['title'],
                meeting_time=meeting['meeting_time'],
                summary=meeting['summary'],
                created_at=meeting['created_at'],
                attendees=attendees,
                creator_id=meeting['creator_id'],
                creator_username=meeting['creator_username']
            ))
        
        return meeting_list

@router.get("/meetings/{meeting_id}", response_model=Meeting)
def get_meeting_details(meeting_id: int):
    with get_db_connection() as connection:
        cursor = connection.cursor(dictionary=True)
        
        query = '''
            SELECT 
                m.meeting_id, m.title, m.meeting_time, m.summary, m.created_at, 
                m.user_id as creator_id, u.caption as creator_username,
                af.file_path as audio_file_path
            FROM meetings m
            JOIN users u ON m.user_id = u.user_id
            LEFT JOIN audio_files af ON m.meeting_id = af.meeting_id
            WHERE m.meeting_id = %s
        '''
        cursor.execute(query, (meeting_id,))
        meeting = cursor.fetchone()

        if not meeting:
            raise HTTPException(status_code=404, detail="Meeting not found")

        attendees_query = '''
        SELECT u.user_id, u.caption
        FROM attendees a
        JOIN users u ON a.user_id = u.user_id
        WHERE a.meeting_id = %s
        '''
        cursor.execute(attendees_query, (meeting['meeting_id'],))
        attendees_data = cursor.fetchall()
        attendees = [{'user_id': row['user_id'], 'caption': row['caption']} for row in attendees_data]

        meeting_data = Meeting(
            meeting_id=meeting['meeting_id'],
            title=meeting['title'],
            meeting_time=meeting['meeting_time'],
            summary=meeting['summary'],
            created_at=meeting['created_at'],
            attendees=attendees,
            creator_id=meeting['creator_id'],
            creator_username=meeting['creator_username']
        )
        
        # Add audio file path if exists
        if meeting['audio_file_path']:
            meeting_data.audio_file_path = meeting['audio_file_path']
        
        return meeting_data

@router.get("/meetings/{meeting_id}/transcript", response_model=list[TranscriptSegment])
def get_meeting_transcript(meeting_id: int):
    """获取会议的转录内容"""
    with get_db_connection() as connection:
        cursor = connection.cursor(dictionary=True)
        
        # First check if meeting exists
        meeting_query = "SELECT meeting_id FROM meetings WHERE meeting_id = %s"
        cursor.execute(meeting_query, (meeting_id,))
        if not cursor.fetchone():
            raise HTTPException(status_code=404, detail="Meeting not found")
        
        # Get transcript segments
        transcript_query = '''
            SELECT segment_id, meeting_id, speaker_id, speaker_tag, start_time_ms, end_time_ms, text_content
            FROM transcript_segments 
            WHERE meeting_id = %s 
            ORDER BY start_time_ms ASC
        '''
        cursor.execute(transcript_query, (meeting_id,))
        segments = cursor.fetchall()
        
        transcript_segments = []
        for segment in segments:
            transcript_segments.append(TranscriptSegment(
                segment_id=segment['segment_id'],
                meeting_id=segment['meeting_id'],
                speaker_id=segment['speaker_id'],
                speaker_tag=segment['speaker_tag'] if segment['speaker_tag'] else f"发言人 {segment['speaker_id']}",
                start_time_ms=segment['start_time_ms'],
                end_time_ms=segment['end_time_ms'],
                text_content=segment['text_content']
            ))
        
        return transcript_segments

@router.post("/meetings")
def create_meeting(meeting_request: CreateMeetingRequest):
    with get_db_connection() as connection:
        cursor = connection.cursor(dictionary=True)
        
        # Create meeting
        meeting_query = '''
            INSERT INTO meetings (user_id, title, meeting_time, summary)
            VALUES (%s, %s, %s, %s)
        '''
        cursor.execute(meeting_query, (
            meeting_request.user_id,
            meeting_request.title,
            meeting_request.meeting_time,
            None  # summary starts as None
        ))
        
        meeting_id = cursor.lastrowid
        
        # Add attendees
        for attendee_id in meeting_request.attendee_ids:
            attendee_query = '''
                INSERT IGNORE INTO attendees (meeting_id, user_id)
                VALUES (%s, %s)
            '''
            cursor.execute(attendee_query, (meeting_id, attendee_id))
        
        connection.commit()
        return {"message": "Meeting created successfully", "meeting_id": meeting_id}

@router.put("/meetings/{meeting_id}")
def update_meeting(meeting_id: int, meeting_request: UpdateMeetingRequest):
    with get_db_connection() as connection:
        cursor = connection.cursor(dictionary=True)
        
        # Check if meeting exists
        cursor.execute("SELECT meeting_id FROM meetings WHERE meeting_id = %s", (meeting_id,))
        if not cursor.fetchone():
            raise HTTPException(status_code=404, detail="Meeting not found")
        
        # Update meeting
        update_query = '''
            UPDATE meetings 
            SET title = %s, meeting_time = %s, summary = %s
            WHERE meeting_id = %s
        '''
        cursor.execute(update_query, (
            meeting_request.title,
            meeting_request.meeting_time,
            meeting_request.summary,
            meeting_id
        ))
        
        # Update attendees - remove existing and add new ones
        cursor.execute("DELETE FROM attendees WHERE meeting_id = %s", (meeting_id,))
        
        for attendee_id in meeting_request.attendee_ids:
            attendee_query = '''
                INSERT INTO attendees (meeting_id, user_id)
                VALUES (%s, %s)
            '''
            cursor.execute(attendee_query, (meeting_id, attendee_id))
        
        connection.commit()
        return {"message": "Meeting updated successfully"}

@router.delete("/meetings/{meeting_id}")
def delete_meeting(meeting_id: int):
    with get_db_connection() as connection:
        cursor = connection.cursor(dictionary=True)
        
        # Check if meeting exists
        cursor.execute("SELECT meeting_id FROM meetings WHERE meeting_id = %s", (meeting_id,))
        if not cursor.fetchone():
            raise HTTPException(status_code=404, detail="Meeting not found")
        
        # Delete related records first (foreign key constraints)
        cursor.execute("DELETE FROM transcript_segments WHERE meeting_id = %s", (meeting_id,))
        cursor.execute("DELETE FROM audio_files WHERE meeting_id = %s", (meeting_id,))
        cursor.execute("DELETE FROM attachments WHERE meeting_id = %s", (meeting_id,))
        cursor.execute("DELETE FROM attendees WHERE meeting_id = %s", (meeting_id,))
        
        # Delete meeting
        cursor.execute("DELETE FROM meetings WHERE meeting_id = %s", (meeting_id,))
        
        connection.commit()
        return {"message": "Meeting deleted successfully"}

@router.post("/meetings/{meeting_id}/regenerate-summary")
def regenerate_summary(meeting_id: int):
    with get_db_connection() as connection:
        cursor = connection.cursor(dictionary=True)
        
        # Check if meeting exists
        cursor.execute("SELECT meeting_id FROM meetings WHERE meeting_id = %s", (meeting_id,))
        if not cursor.fetchone():
            raise HTTPException(status_code=404, detail="Meeting not found")
        
        # For now, return a mock summary
        # In a real implementation, this would call an AI service
        mock_summary = """# AI 生成摘要

## 主要议题
- 项目进度回顾
- 技术方案讨论
- 下阶段规划

## 关键决策
- 采用新的技术架构
- 调整项目时间节点
- 分配任务责任

## 后续行动
- [ ] 完成技术方案文档
- [ ] 安排下次会议时间
- [ ] 跟进项目进度"""
        
        # Update meeting summary
        update_query = "UPDATE meetings SET summary = %s WHERE meeting_id = %s"
        cursor.execute(update_query, (mock_summary, meeting_id))
        connection.commit()
        
        return {"message": "Summary regenerated successfully", "summary": mock_summary}

@router.get("/meetings/{meeting_id}/edit", response_model=Meeting)
def get_meeting_for_edit(meeting_id: int):
    """获取会议信息用于编辑"""
    with get_db_connection() as connection:
        cursor = connection.cursor(dictionary=True)
        
        query = '''
            SELECT 
                m.meeting_id, m.title, m.meeting_time, m.summary, m.created_at, 
                m.user_id as creator_id, u.caption as creator_username,
                af.file_path as audio_file_path
            FROM meetings m
            JOIN users u ON m.user_id = u.user_id
            LEFT JOIN audio_files af ON m.meeting_id = af.meeting_id
            WHERE m.meeting_id = %s
        '''
        cursor.execute(query, (meeting_id,))
        meeting = cursor.fetchone()

        if not meeting:
            raise HTTPException(status_code=404, detail="Meeting not found")

        # Get attendees
        attendees_query = '''
        SELECT u.user_id, u.caption
        FROM attendees a
        JOIN users u ON a.user_id = u.user_id
        WHERE a.meeting_id = %s
        '''
        cursor.execute(attendees_query, (meeting_id,))
        attendees_data = cursor.fetchall()
        attendees = [{'user_id': row['user_id'], 'caption': row['caption']} for row in attendees_data]

        meeting_data = Meeting(
            meeting_id=meeting['meeting_id'],
            title=meeting['title'],
            meeting_time=meeting['meeting_time'],
            summary=meeting['summary'],
            created_at=meeting['created_at'],
            attendees=attendees,
            creator_id=meeting['creator_id'],
            creator_username=meeting['creator_username']
        )
        
        # Add audio file path if exists
        if meeting.get('audio_file_path'):
            meeting_data.audio_file_path = meeting['audio_file_path']
        
        return meeting_data

@router.post("/meetings/upload-audio")
async def upload_audio(
    audio_file: UploadFile = File(...),
    meeting_id: int = Form(...)
):
    # Validate file extension
    file_extension = os.path.splitext(audio_file.filename)[1].lower()
    if file_extension not in ALLOWED_EXTENSIONS:
        raise HTTPException(
            status_code=400, 
            detail=f"Unsupported file type. Allowed types: {', '.join(ALLOWED_EXTENSIONS)}"
        )
    
    # Check file size
    if audio_file.size > MAX_FILE_SIZE:
        raise HTTPException(
            status_code=400,
            detail="File size exceeds 100MB limit"
        )
    
    # Create meeting-specific directory
    meeting_dir = AUDIO_DIR / str(meeting_id)
    meeting_dir.mkdir(exist_ok=True)

    # Generate unique filename
    unique_filename = f"{uuid.uuid4()}{file_extension}"
    absolute_path = meeting_dir / unique_filename
    relative_path = absolute_path.relative_to(BASE_DIR)
    
    # Save file
    try:
        with open(absolute_path, "wb") as buffer:
            shutil.copyfileobj(audio_file.file, buffer)
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Failed to save file: {str(e)}")
    
    # Save file info to database
    with get_db_connection() as connection:
        cursor = connection.cursor(dictionary=True)
        
        # Check if meeting exists
        cursor.execute("SELECT meeting_id FROM meetings WHERE meeting_id = %s", (meeting_id,))
        if not cursor.fetchone():
            # Clean up uploaded file if meeting doesn't exist
            os.remove(absolute_path)
            raise HTTPException(status_code=404, detail="Meeting not found")
        
        # Insert audio file record
        insert_query = '''
            INSERT INTO audio_files (meeting_id, file_name, file_path, file_size, upload_time)
            VALUES (%s, %s, %s, %s, NOW())
            ON DUPLICATE KEY UPDATE
            file_name = VALUES(file_name),
            file_path = VALUES(file_path),
            file_size = VALUES(file_size),
            upload_time = VALUES(upload_time)
        '''
        cursor.execute(insert_query, (meeting_id, audio_file.filename, '/'+str(relative_path), audio_file.size))
        connection.commit()
    
    return {
        "message": "Audio file uploaded successfully",
        "file_name": audio_file.filename,
        "file_path": '/'+str(relative_path)
    }

@router.get("/meetings/{meeting_id}/audio")
def get_audio_file(meeting_id: int):
    with get_db_connection() as connection:
        cursor = connection.cursor(dictionary=True)
        
        query = '''
            SELECT file_name, file_path, file_size, upload_time
            FROM audio_files 
            WHERE meeting_id = %s
        '''
        cursor.execute(query, (meeting_id,))
        audio_file = cursor.fetchone()
        
        if not audio_file:
            raise HTTPException(status_code=404, detail="Audio file not found for this meeting")
        
        return {
            "file_name": audio_file['file_name'],
            "file_path": audio_file['file_path'],
            "file_size": audio_file['file_size'],
            "upload_time": audio_file['upload_time']
        }

@router.post("/meetings/{meeting_id}/upload-image")
async def upload_image(
    meeting_id: int,
    image_file: UploadFile = File(...)
):
    # Validate file extension
    file_extension = os.path.splitext(image_file.filename)[1].lower()
    if file_extension not in ALLOWED_IMAGE_EXTENSIONS:
        raise HTTPException(
            status_code=400, 
            detail=f"Unsupported image type. Allowed types: {', '.join(ALLOWED_IMAGE_EXTENSIONS)}"
        )
    
    # Check file size
    if image_file.size > MAX_IMAGE_SIZE:
        raise HTTPException(
            status_code=400,
            detail="Image size exceeds 10MB limit"
        )
    
    # Check if meeting exists
    with get_db_connection() as connection:
        cursor = connection.cursor(dictionary=True)
        cursor.execute("SELECT meeting_id FROM meetings WHERE meeting_id = %s", (meeting_id,))
        if not cursor.fetchone():
            raise HTTPException(status_code=404, detail="Meeting not found")
    
    # Create meeting-specific directory
    meeting_dir = MARKDOWN_DIR / str(meeting_id)
    meeting_dir.mkdir(exist_ok=True)
    
    # Generate unique filename
    unique_filename = f"{uuid.uuid4()}{file_extension}"
    absolute_path = meeting_dir / unique_filename
    relative_path = absolute_path.relative_to(BASE_DIR)
    
    # Save file
    try:
        with open(absolute_path, "wb") as buffer:
            shutil.copyfileobj(image_file.file, buffer)
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Failed to save image: {str(e)}")
    
    return {
        "message": "Image uploaded successfully",
        "file_name": image_file.filename,
        "file_path": '/'+ str(relative_path)
    }

# 发言人标签更新接口
@router.put("/meetings/{meeting_id}/speaker-tags")
def update_speaker_tag(meeting_id: int, request: SpeakerTagUpdateRequest):
    """更新单个发言人标签（基于原始的speaker_id值）"""
    try:
        with get_db_connection() as connection:
            cursor = connection.cursor()
            
            # 只修改speaker_tag，保留speaker_id的原始值
            update_query = """
                UPDATE transcript_segments 
                SET speaker_tag = %s 
                WHERE meeting_id = %s AND speaker_id = %s
            """
            cursor.execute(update_query, (request.new_tag, meeting_id, request.speaker_id))
            
            if cursor.rowcount == 0:
                raise HTTPException(status_code=404, detail="No segments found for this speaker")
            
            connection.commit()
            return {'message': 'Speaker tag updated successfully', 'updated_count': cursor.rowcount}
            
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Failed to update speaker tag: {str(e)}")

@router.put("/meetings/{meeting_id}/speaker-tags/batch")
def batch_update_speaker_tags(meeting_id: int, request: BatchSpeakerTagUpdateRequest):
    """批量更新发言人标签（基于原始的speaker_id值）"""
    try:
        with get_db_connection() as connection:
            cursor = connection.cursor()
            
            total_updated = 0
            for update_item in request.updates:
                # 只修改speaker_tag，保留speaker_id的原始值
                update_query = """
                    UPDATE transcript_segments 
                    SET speaker_tag = %s 
                    WHERE meeting_id = %s AND speaker_id = %s
                """
                cursor.execute(update_query, (update_item.new_tag, meeting_id, update_item.speaker_id))
                total_updated += cursor.rowcount
            
            connection.commit()
            return {'message': 'Speaker tags updated successfully', 'total_updated': total_updated}
            
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Failed to batch update speaker tags: {str(e)}")

# 转录内容更新接口
@router.put("/meetings/{meeting_id}/transcript/batch")
def batch_update_transcript(meeting_id: int, request: BatchTranscriptUpdateRequest):
    """批量更新转录内容"""
    try:
        with get_db_connection() as connection:
            cursor = connection.cursor()
            
            total_updated = 0
            for update_item in request.updates:
                # 验证segment_id是否属于指定会议
                verify_query = "SELECT segment_id FROM transcript_segments WHERE segment_id = %s AND meeting_id = %s"
                cursor.execute(verify_query, (update_item.segment_id, meeting_id))
                if not cursor.fetchone():
                    continue  # 跳过不属于该会议的转录条目
                
                # 更新转录内容
                update_query = """
                    UPDATE transcript_segments 
                    SET text_content = %s 
                    WHERE segment_id = %s AND meeting_id = %s
                """
                cursor.execute(update_query, (update_item.text_content, update_item.segment_id, meeting_id))
                total_updated += cursor.rowcount
            
            connection.commit()
            return {'message': 'Transcript updated successfully', 'total_updated': total_updated}
            
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Failed to update transcript: {str(e)}")

# AI总结相关接口
@router.post("/meetings/{meeting_id}/generate-summary")
def generate_meeting_summary(meeting_id: int, request: GenerateSummaryRequest):
    """生成会议AI总结"""
    try:
        # 检查会议是否存在
        with get_db_connection() as connection:
            cursor = connection.cursor(dictionary=True)
            cursor.execute("SELECT meeting_id FROM meetings WHERE meeting_id = %s", (meeting_id,))
            if not cursor.fetchone():
                raise HTTPException(status_code=404, detail="Meeting not found")
        
        # 调用LLM服务生成总结
        result = llm_service.generate_meeting_summary(meeting_id, request.user_prompt)
        
        if result.get("error"):
            raise HTTPException(status_code=500, detail=result["error"])
        
        return {
            "message": "Summary generated successfully",
            "summary_id": result["summary_id"],
            "content": result["content"],
            "meeting_id": meeting_id
        }
        
    except HTTPException:
        raise
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Failed to generate summary: {str(e)}")

@router.get("/meetings/{meeting_id}/summaries")
def get_meeting_summaries(meeting_id: int):
    """获取会议的所有AI总结历史"""
    try:
        # 检查会议是否存在
        with get_db_connection() as connection:
            cursor = connection.cursor(dictionary=True)
            cursor.execute("SELECT meeting_id FROM meetings WHERE meeting_id = %s", (meeting_id,))
            if not cursor.fetchone():
                raise HTTPException(status_code=404, detail="Meeting not found")
        
        # 获取总结列表
        summaries = llm_service.get_meeting_summaries(meeting_id)
        
        return {
            "meeting_id": meeting_id,
            "summaries": summaries
        }
        
    except HTTPException:
        raise
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Failed to get summaries: {str(e)}")

@router.get("/meetings/{meeting_id}/summaries/{summary_id}")
def get_summary_detail(meeting_id: int, summary_id: int):
    """获取特定总结的详细内容"""
    try:
        with get_db_connection() as connection:
            cursor = connection.cursor(dictionary=True)
            query = """
                SELECT id, summary_content, user_prompt, created_at
                FROM meeting_summaries 
                WHERE id = %s AND meeting_id = %s
            """
            cursor.execute(query, (summary_id, meeting_id))
            summary = cursor.fetchone()
            
            if not summary:
                raise HTTPException(status_code=404, detail="Summary not found")
            
            return {
                "id": summary["id"],
                "meeting_id": meeting_id,
                "content": summary["summary_content"],
                "user_prompt": summary["user_prompt"],
                "created_at": summary["created_at"].isoformat() if summary["created_at"] else None
            }
            
    except HTTPException:
        raise
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Failed to get summary detail: {str(e)}")