export const dynamic = 'force-dynamic';

import { NextRequest, NextResponse } from 'next/server';
import { supabase } from '@/lib/supabase';

export async function GET(request: NextRequest) {
  const { searchParams } = new URL(request.url);
  const projectId = searchParams.get('project_id');
  const objectiveId = searchParams.get('objective_id');
  const ownerUserId = searchParams.get('owner_user_id');
  const status = searchParams.get('status');

  let query = supabase
    .from('krs')
    .select(`
      *,
      owner:users!krs_owner_user_id_fkey(id, name, role, avatar_url),
      project:projects(id, name, status)
    `)
    .order('period_start', { ascending: false });

  if (projectId) query = query.eq('project_id', projectId);
  if (objectiveId) query = query.eq('objective_id', objectiveId);
  if (ownerUserId) query = query.eq('owner_user_id', ownerUserId);
  if (status) query = query.eq('status', status);

  const { data, error } = await query;

  if (error) {
    return NextResponse.json({ error: error.message }, { status: 500 });
  }

  return NextResponse.json(data);
}

export async function POST(request: NextRequest) {
  const body = await request.json();
  const {
    project_id,
    objective_id,
    period_type,
    period_name,
    period_start,
    period_end,
    title,
    metric_name,
    unit,
    direction,
    target_value,
    owner_user_id,
    confidence,
    note,
  } = body;

  if (!project_id || !title || !metric_name || !unit || !target_value || !period_start || !period_end) {
    return NextResponse.json(
      { error: '项目ID、标题、指标名称、单位、目标值、开始和结束日期为必填项' },
      { status: 400 }
    );
  }

  if (target_value <= 0) {
    return NextResponse.json({ error: '目标值必须大于0' }, { status: 400 });
  }

  if (new Date(period_end) < new Date(period_start)) {
    return NextResponse.json({ error: '结束日期不能早于开始日期' }, { status: 400 });
  }

  if (owner_user_id) {
    const { data: existingKRs } = await supabase
      .from('krs')
      .select('id')
      .eq('owner_user_id', owner_user_id)
      .eq('period_start', period_start)
      .eq('period_end', period_end);

    if (existingKRs && existingKRs.length >= 3) {
      return NextResponse.json(
        { error: '该用户在此周期内已有3个KR，无法继续创建' },
        { status: 400 }
      );
    }
  }

  const { data, error } = await supabase
    .from('krs')
    .insert({
      project_id,
      objective_id,
      period_type: period_type || 'custom',
      period_name,
      period_start,
      period_end,
      title,
      metric_name,
      unit,
      direction: direction || 'increase',
      target_value,
      current_value: 0,
      owner_user_id,
      confidence: confidence || 80,
      status: 'green',
      note,
    })
    .select()
    .single();

  if (error) {
    return NextResponse.json({ error: error.message }, { status: 500 });
  }

  return NextResponse.json(data, { status: 201 });
}