export const dynamic = 'force-dynamic';

import { NextRequest, NextResponse } from 'next/server';
import { supabase } from '@/lib/supabase';
import { determineKRStatus, determineProjectStatus } from '@/lib/kr-utils';
import type { KR, Checkin } from '@/types/database';
import { ensureAuthenticated, getAuthContext, hasProjectAccess } from '@/lib/access-control';

export async function GET(request: NextRequest) {
  const ctx = await getAuthContext(request);
  const auth = ensureAuthenticated(ctx);
  if (!auth.ok) {
    return NextResponse.json({ error: auth.error }, { status: auth.status });
  }

  const { searchParams } = new URL(request.url);
  const krId = searchParams.get('kr_id');
  const projectId = searchParams.get('project_id');
  const userId = searchParams.get('user_id');
  const limit = searchParams.get('limit');

  let query = supabase
    .from('checkins')
    .select(`
      *,
      user:users(id, name, avatar_url),
      kr:krs(id, title, metric_name, unit)
    `)
    .order('created_at', { ascending: false });

  if (!ctx!.isAdmin) {
    if (userId && userId !== ctx!.user.id) {
      return NextResponse.json({ error: '无权限' }, { status: 403 });
    }
    if (projectId && !hasProjectAccess(ctx!, projectId)) {
      return NextResponse.json({ error: '无权限' }, { status: 403 });
    }
    if (krId) {
      const { data: kr, error: krErr } = await supabase
        .from('krs')
        .select('id,project_id')
        .eq('id', krId)
        .maybeSingle();
      if (krErr) return NextResponse.json({ error: krErr.message }, { status: 500 });
      if (!kr) return NextResponse.json({ error: 'KR不存在' }, { status: 404 });
      if (!hasProjectAccess(ctx!, kr.project_id)) {
        return NextResponse.json({ error: '无权限' }, { status: 403 });
      }
    }

    if (!projectId && !krId) {
      if (ctx!.accessibleProjectIds.length === 0) {
        return NextResponse.json([]);
      }
      query = query.in('project_id', ctx!.accessibleProjectIds);
    }
  }

  if (krId) query = query.eq('kr_id', krId);
  if (projectId) query = query.eq('project_id', projectId);
  if (userId) query = query.eq('user_id', userId);
  if (limit) query = query.limit(parseInt(limit));

  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 ctx = await getAuthContext(request);
  const auth = ensureAuthenticated(ctx);
  if (!auth.ok) {
    return NextResponse.json({ error: auth.error }, { status: auth.status });
  }

  const body = await request.json();
  const { kr_id, project_id, user_id, date, current_value, confidence, reason_code, note } = body;

  if (!kr_id || !project_id || current_value === undefined || confidence === undefined) {
    return NextResponse.json(
      { error: 'KR ID、项目ID、当前值和信心度为必填项' },
      { status: 400 }
    );
  }

  const { data: krData, error: krError } = await supabase
    .from('krs')
    .select('*')
    .eq('id', kr_id)
    .single();

  if (krError || !krData) {
    return NextResponse.json({ error: 'KR不存在' }, { status: 404 });
  }

  const kr = krData as KR;

  if (kr.project_id !== project_id) {
    return NextResponse.json({ error: '项目与 KR 不匹配' }, { status: 400 });
  }

  if (!ctx!.isAdmin) {
    if (!hasProjectAccess(ctx!, project_id)) {
      return NextResponse.json({ error: '无权限' }, { status: 403 });
    }
    if (user_id && user_id !== ctx!.user.id) {
      return NextResponse.json({ error: '无权限' }, { status: 403 });
    }
  }

  const { data: recentCheckins } = await supabase
    .from('checkins')
    .select('*')
    .eq('kr_id', kr_id)
    .order('created_at', { ascending: false })
    .limit(2);

  const delta_value = current_value - kr.current_value;

  const updatedKR: KR = {
    ...kr,
    current_value,
    confidence,
    reason_code: reason_code || kr.reason_code,
    note: note || kr.note,
  };

  const newStatus = determineKRStatus(updatedKR, (recentCheckins as Checkin[]) || []);

  if ((newStatus === 'yellow' || newStatus === 'red') && !reason_code) {
    return NextResponse.json(
      { error: '黄色或红色状态必须提供原因代码' },
      { status: 400 }
    );
  }

  const checkinDate = date || new Date().toISOString().split('T')[0];

  const { data: checkin, error: checkinError } = await supabase
    .from('checkins')
    .insert({
      kr_id,
      project_id,
      user_id: ctx!.isAdmin ? user_id : ctx!.user.id,
      date: checkinDate,
      current_value,
      delta_value,
      confidence,
      status_snapshot: newStatus,
      reason_code,
      note,
    })
    .select()
    .single();

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

  await supabase
    .from('krs')
    .update({
      current_value,
      confidence,
      status: newStatus,
      reason_code: reason_code || (newStatus === 'green' ? null : kr.reason_code),
      note: note || kr.note,
      updated_at: new Date().toISOString(),
    })
    .eq('id', kr_id);

  const { data: projectKRs } = await supabase
    .from('krs')
    .select('status')
    .eq('project_id', project_id);

  if (projectKRs) {
    const projectStatus = determineProjectStatus(projectKRs as KR[]);
    await supabase
      .from('projects')
      .update({ status: projectStatus, updated_at: new Date().toISOString() })
      .eq('id', project_id);
  }

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