/**
 * POST /api/tasks/checkin - Daily check-in task completion
 */

import { NextRequest, NextResponse } from 'next/server';
import { requireAuth } from '@/app/lib/auth';
import { getActiveTasks, getUserCompletedTasks, createUserTask } from '@/app/lib/db/store';
import { addPoints } from '@/app/lib/points';
import { checkAndAwardBadges } from '@/app/lib/badges';
import { TaskType, UserTask, ApiResponse } from '@/app/lib/types';

export async function POST(request: NextRequest) {
  try {
    // Authenticate user
    const user = requireAuth(request);

    // Find the daily check-in task
    const tasks = getActiveTasks();
    const checkinTask = tasks.find(t => t.type === TaskType.CHECKIN);

    if (!checkinTask) {
      return NextResponse.json<ApiResponse>(
        {
          success: false,
          error: 'Daily check-in task not found'
        },
        { status: 404 }
      );
    }

    // Check if user already checked in today
    const completedTasks = getUserCompletedTasks(user.id);
    const today = new Date().toISOString().split('T')[0];
    const alreadyCheckedIn = completedTasks.some(ut => {
      const completedDate = ut.completedAt.toISOString().split('T')[0];
      return ut.taskId === checkinTask.id && completedDate === today;
    });

    if (alreadyCheckedIn) {
      return NextResponse.json<ApiResponse>(
        {
          success: false,
          error: 'You have already checked in today'
        },
        { status: 409 }
      );
    }

    // Complete the check-in task
    const userTask = createUserTask(user.id, checkinTask.id, checkinTask.pointsReward);

    // Award points
    addPoints(user.id, checkinTask.pointsReward, `task:${checkinTask.id}`);

    // Check and award badges
    const newBadges = checkAndAwardBadges(user.id);

    return NextResponse.json<ApiResponse<UserTask>>(
      {
        success: true,
        data: userTask,
        message: `Check-in successful! You earned ${checkinTask.pointsReward} points${
          newBadges.length > 0 ? ` and ${newBadges.length} new badge(s)!` : ''
        }`
      },
      { status: 201 }
    );
  } catch (error) {
    if (error instanceof Error && error.message === 'Unauthorized') {
      return NextResponse.json<ApiResponse>(
        {
          success: false,
          error: 'Unauthorized'
        },
        { status: 401 }
      );
    }

    console.error('Check-in error:', error);
    return NextResponse.json<ApiResponse>(
      {
        success: false,
        error: 'Internal server error'
      },
      { status: 500 }
    );
  }
}