import { NextResponse } from 'next/server';
import { getServerSession } from 'next-auth';
import { authOptions } from "@/app/api/auth/options";
import { prisma } from '@/lib/prisma';
import { getPublicUrl } from '@/lib/s3';
import { S3_CONFIG } from '@/lib/s3';
import { IntegrationService } from '@/lib/services/integration-service';

// Helper function to check authentication
async function checkAuth(request: Request) {
  const session = await getServerSession(authOptions);
  if (!session?.user?.id) {
    console.error('Unauthorized access attempt:', {
      url: request.url,
      method: request.method,
      headers: Object.fromEntries(request.headers)
    });
    return { authorized: false, userId: null };
  }
  return { authorized: true, userId: session.user.id };
}

// GET endpoint to list missions with filters
export async function GET(request: Request) {
  try {
    const { authorized, userId } = await checkAuth(request);
    if (!authorized || !userId) {
      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
    }

    const { searchParams } = new URL(request.url);
    const limit = Number(searchParams.get('limit') || '10');
    const offset = Number(searchParams.get('offset') || '0');
    const search = searchParams.get('search');
    
    // Build query conditions
    const where: any = {};
    
    // Add search filter if provided
    if (search) {
      where.OR = [
        { name: { contains: search, mode: 'insensitive' } },
        { intention: { contains: search, mode: 'insensitive' } }
      ];
    }
    
    // Get missions with basic info
    const missions = await (prisma as any).mission.findMany({
      where,
      skip: offset,
      take: limit,
      orderBy: { createdAt: 'desc' },
      select: {
        id: true,
        name: true,
        logo: true,
        oddScope: true,
        niveau: true,
        missionType: true,
        projection: true,
        participation: true,
        services: true,
        intention: true,
        createdAt: true,
        creator: {
          select: {
            id: true,
            email: true
          }
        },
        missionUsers: {
          select: {
            id: true,
            role: true,
            user: {
              select: {
                id: true,
                email: true
              }
            }
          }
        }
      }
    });
    
    // Get total count
    const totalCount = await (prisma as any).mission.count({ where });
    
    // Transform logo paths to public URLs
    const missionsWithPublicUrls = missions.map((mission: any) => ({
      ...mission,
      logo: mission.logo ? `/api/missions/image/${mission.logo}` : null
    }));
    
    return NextResponse.json({
      missions: missionsWithPublicUrls,
      pagination: {
        total: totalCount,
        offset,
        limit
      }
    });
  } catch (error) {
    console.error('Error listing missions:', error);
    return NextResponse.json({ 
      error: 'Internal server error', 
      details: error instanceof Error ? error.message : String(error) 
    }, { status: 500 });
  }
}

// POST endpoint to create a new mission
export async function POST(request: Request) {
  try {
    const { authorized, userId } = await checkAuth(request);
    if (!authorized || !userId) {
      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
    }

    // Parse the request body
    const body = await request.json();
    const { 
      name,
      logo,
      oddScope,
      niveau,
      intention,
      missionType,
      donneurDOrdre,
      projection,
      services,
      participation,
      profils,
      guardians,
      volunteers
    } = body;
    
    // Validate required fields
    if (!name || !niveau || !intention || !missionType || !donneurDOrdre || !projection) {
      return NextResponse.json({ 
        error: 'Missing required fields',
        required: { 
          name: true, 
          niveau: true, 
          intention: true, 
          missionType: true,
          donneurDOrdre: true,
          projection: true
        },
        received: { 
          name: !!name, 
          niveau: !!niveau, 
          intention: !!intention, 
          missionType: !!missionType,
          donneurDOrdre: !!donneurDOrdre,
          projection: !!projection
        }
      }, { status: 400 });
    }
    
    // Wrap the mission creation and integration in a transaction
    const result = await prisma.$transaction(async (tx: any) => {
      // Create the mission
      const mission = await tx.mission.create({
        data: {
          name,
          logo,
          oddScope: oddScope || [],
          niveau,
          intention,
          missionType,
          donneurDOrdre,
          projection,
          services: services || [],
          participation,
          profils: profils || [],
          creatorId: userId
        }
      });
      
      // Add guardians if provided
      if (guardians) {
        const guardianRoles = ['gardien-temps', 'gardien-parole', 'gardien-memoire'];
        const guardianEntries = Object.entries(guardians)
          .filter(([role, userId]) => guardianRoles.includes(role) && userId)
          .map(([role, userId]) => ({
            role,
            userId: userId as string,
            missionId: mission.id
          }));
        
        if (guardianEntries.length > 0) {
          await tx.missionUser.createMany({
            data: guardianEntries
          });
        }
      }
      
      // Add volunteers if provided
      if (volunteers && volunteers.length > 0) {
        const volunteerEntries = volunteers.map((userId: string) => ({
          role: 'volontaire',
          userId,
          missionId: mission.id
        }));
        
        await tx.missionUser.createMany({
          data: volunteerEntries
        });
      }
      
      return mission;
    });
    
    try {
      // Initialize external integrations after transaction completes
      const integrationService = new IntegrationService();
      const integrationResult = await integrationService.setupIntegrationsForMission(result.id);
      
      if (!integrationResult.success) {
        // If integration failed, the mission was already deleted in the integration service
        return NextResponse.json({ 
          error: 'Failed to set up external services', 
          details: integrationResult.error 
        }, { status: 500 });
      }
      
      return NextResponse.json({
        success: true,
        mission: {
          id: result.id,
          name: result.name,
          createdAt: result.createdAt
        },
        integrations: {
          status: 'success',
          data: integrationResult.data
        }
      });
    } catch (integrationError) {
      // If there's any unhandled error, delete the mission and report failure
      console.error('Integration error:', integrationError);
      await (prisma as any).mission.delete({ where: { id: result.id } });
      
      return NextResponse.json({ 
        error: 'Failed to set up external services', 
        details: integrationError instanceof Error ? integrationError.message : String(integrationError)
      }, { status: 500 });
    }
  } catch (error) {
    console.error('Error creating mission:', error);
    return NextResponse.json({ 
      error: 'Internal server error', 
      details: error instanceof Error ? error.message : String(error) 
    }, { status: 500 });
  }
}