"""
音乐模块视图 - App端
"""
from rest_framework import viewsets
from rest_framework.decorators import action
from rest_framework.permissions import IsAuthenticated
from drf_spectacular.utils import extend_schema

from utils.response import success, error
from utils.exceptions import ErrorCode
from apps.admins.authentication import AppJWTAuthentication
from .models import Track
from .serializers import TrackSerializer, GenerateMusicSerializer


@extend_schema(tags=['音乐'])
class MusicViewSet(viewsets.ViewSet):
    """音乐视图集（App端）"""

    authentication_classes = [AppJWTAuthentication]
    permission_classes = [IsAuthenticated]

    @action(detail=False, methods=['get'], url_path='playlist')
    def playlist(self, request):
        """
        获取播放列表
        GET /api/v1/music/playlist/
        """
        tracks = Track.objects.filter(user=request.user)
        return success(data={
            'playlist': TrackSerializer(tracks, many=True).data,
        })

    def destroy(self, request, pk=None):
        """
        删除音乐
        DELETE /api/v1/music/{id}/
        """
        try:
            track = Track.objects.get(id=pk, user=request.user)
        except Track.DoesNotExist:
            return error(code=ErrorCode.TRACK_NOT_FOUND, message='曲目不存在')
        track.delete()
        return success(message='删除成功')

    @action(detail=True, methods=['post'])
    def favorite(self, request, pk=None):
        """
        收藏/取消收藏
        POST /api/v1/music/{id}/favorite/
        """
        try:
            track = Track.objects.get(id=pk, user=request.user)
        except Track.DoesNotExist:
            return error(code=ErrorCode.TRACK_NOT_FOUND, message='曲目不存在')

        track.is_favorite = not track.is_favorite
        track.save(update_fields=['is_favorite'])

        return success(
            data={'is_favorite': track.is_favorite},
            message='已收藏' if track.is_favorite else '已取消收藏'
        )

    @action(detail=False, methods=['post'], url_path='generate')
    def generate(self, request):
        """
        生成音乐 (SSE 流式 - 占位)
        POST /api/v1/music/generate/
        """
        serializer = GenerateMusicSerializer(data=request.data)
        if not serializer.is_valid():
            return error(message=str(serializer.errors))

        # TODO: 接入 MiniMax API 实现 SSE 流式生成
        track = Track.objects.create(
            user=request.user,
            title='生成中...',
            mood=serializer.validated_data.get('mood', 'calm'),
            prompt=serializer.validated_data.get('text', ''),
        )

        return success(data={
            'id': track.id,
            'message': '音乐生成功能待接入 MiniMax API',
        })