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 { N8nService } from '@/lib/services/n8n-service';
import { MissionUser, Prisma } from '@prisma/client';

interface MissionUserInput {
  role: string;
  userId: string;
  missionId: string;
}

// Helper function to check authentication
async function checkAuth(request: Request) {
  // Check for API key in headers first
  const apiKey = request.headers.get('x-api-key');
  console.log('Received API key from headers:', apiKey);
  
  // If no API key in headers, try to get it from the request body
  let bodyApiKey = null;
  if (request.method === 'POST') {
    const body = await request.clone().json();
    bodyApiKey = body?.config?.N8N_API_KEY;
    console.log('Received API key from body:', bodyApiKey);
  }
  
  const receivedApiKey = apiKey || bodyApiKey;
  console.log('Final API key used:', receivedApiKey);
  console.log('Expected API key:', process.env.N8N_API_KEY);
  console.log('API key match:', receivedApiKey === process.env.N8N_API_KEY);
  
  if (receivedApiKey === process.env.N8N_API_KEY) {
    return { authorized: true, userId: 'system' };
  }

  // If no API key, check for session
  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) {
      console.error('Unauthorized access attempt - no session or user');
      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
    }

    const body = await request.json();
    console.log('Received mission creation request:', JSON.stringify(body, null, 2));

    const { name, oddScope, niveau, intention, missionType, donneurDOrdre, projection, services, participation, profils, guardians, volunteers } = body;

    // Validate required fields
    const requiredFields = {
      name,
      niveau,
      intention,
      missionType,
      donneurDOrdre,
      projection
    };

    const missingFields = Object.entries(requiredFields)
      .filter(([_, value]) => !value)
      .map(([key]) => key);

    if (missingFields.length > 0) {
      console.error('Missing required fields:', missingFields);
      return NextResponse.json({ 
        error: 'Missing required fields', 
        missingFields 
      }, { status: 400 });
    }

    // Check if mission with same name exists
    const existingMission = await prisma.mission.findFirst({
      where: { name }
    });

    if (existingMission) {
      console.error('Mission with same name already exists:', name);
      return NextResponse.json({ error: 'A mission with this name already exists' }, { status: 400 });
    }

    // Trigger n8n workflow first
    const n8nService = new N8nService();
    const n8nData = {
      ...body,
      creatorId: userId
    };
    console.log('Sending data to n8n service:', {
      name: n8nData.name,
      creatorId: n8nData.creatorId,
      oddScope: n8nData.oddScope,
      niveau: n8nData.niveau,
      intention: n8nData.intention,
      missionType: n8nData.missionType,
      donneurDOrdre: n8nData.donneurDOrdre,
      projection: n8nData.projection,
      services: n8nData.services,
      participation: n8nData.participation,
      profils: n8nData.profils,
      fullData: JSON.stringify(n8nData, null, 2)
    });

    try {
      const workflowResult = await n8nService.triggerMissionCreation(n8nData);
      console.log('Received workflow result:', JSON.stringify(workflowResult, null, 2));

      if (!workflowResult.success) {
        console.error('N8n workflow failed:', workflowResult.error);
        return NextResponse.json({ error: 'Failed to create mission resources' }, { status: 500 });
      }

      // Process workflow results
      const results = workflowResult.results || {};
      console.log('Processing workflow results:', JSON.stringify(results, null, 2));

      // Now create the mission with the logo URL from n8n
      console.log('Creating mission in database...');
      const mission = await prisma.mission.create({
        data: {
          name,
          oddScope: oddScope || ['default'],
          niveau,
          intention,
          missionType,
          donneurDOrdre,
          projection,
          services: Array.isArray(services) ? services.filter(Boolean) : [],
          profils: Array.isArray(profils) ? profils.filter(Boolean) : [],
          participation: participation || 'default',
          creatorId: userId,
          logo: results.logoUrl || null,
          // Store integration IDs directly in the mission record
          leantimeProjectId: results.leantimeProjectId?.toString() || null,
          outlineCollectionId: results.outlineCollectionId?.toString() || null,
          rocketChatChannelId: results.rocketChatChannelId?.toString() || null,
          giteaRepositoryUrl: results.giteaRepositoryUrl?.toString() || null,
          penpotProjectId: results.penpotProjectId?.toString() || null
        } as Prisma.MissionUncheckedCreateInput
      });

      console.log('Created mission:', JSON.stringify(mission, null, 2));

      // Add guardians and volunteers
      if (guardians || volunteers) {
        console.log('Adding guardians and volunteers...');
        const missionUsers: MissionUserInput[] = [];

        // Add guardians
        if (guardians) {
          Object.entries(guardians).forEach(([role, userId]) => {
            if (userId) {
              missionUsers.push({
                role,
                userId: userId as string,
                missionId: mission.id
              });
            }
          });
        }

        // Add volunteers
        if (volunteers && Array.isArray(volunteers)) {
          volunteers.forEach(userId => {
            if (userId) {
              missionUsers.push({
                role: 'volontaire',
                userId,
                missionId: mission.id
              });
            }
          });
        }

        if (missionUsers.length > 0) {
          console.log('Creating mission users:', JSON.stringify(missionUsers, null, 2));
          await prisma.missionUser.createMany({
            data: missionUsers
          });
        }
      }

      return NextResponse.json(mission);
    } catch (error) {
      console.error('Error in n8n workflow:', error);
      return NextResponse.json(
        { error: 'Failed to create mission resources', details: error instanceof Error ? error.message : String(error) },
        { status: 500 }
      );
    }
  } catch (error) {
    console.error('Error creating mission:', error);
    return NextResponse.json(
      { error: 'Failed to create mission', details: error instanceof Error ? error.message : String(error) },
      { status: 500 }
    );
  }
}