export const dynamic = 'force-dynamic';

import { NextRequest, NextResponse } from 'next/server';
import { supabase } from '@/lib/supabase';
import { ensureAuthenticated, getAuthContext } from '@/lib/access-control';

async function canAccessTask(userId: string, isAdmin: boolean, accessibleProjectIds: string[], taskId: string) {
  if (isAdmin) return { ok: true as const };

  const { data: task, error } = await supabase
    .from('tasks')
    .select('id,project_id,owner_user_id,executor_ids,help_requested_to_user_id')
    .eq('id', taskId)
    .maybeSingle();

  if (error) return { ok: false as const, status: 500, error: error.message };
  if (!task) return { ok: false as const, status: 404, error: '计划不存在' };

  if (task.project_id && accessibleProjectIds.includes(task.project_id)) return { ok: true as const };
  if (task.owner_user_id === userId) return { ok: true as const };
  if (task.help_requested_to_user_id === userId) return { ok: true as const };
  if (Array.isArray(task.executor_ids) && task.executor_ids.includes(userId)) return { ok: true as const };

  return { ok: false as const, status: 403, error: '无权限' };
}

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

  const access = await canAccessTask(ctx!.user.id, ctx!.isAdmin, ctx!.accessibleProjectIds, params.id);
  if (!access.ok) {
    return NextResponse.json({ error: access.error }, { status: access.status });
  }

  const body = await request.json();
  const {
    title,
    description,
    status,
    priority,
    urgency,
    owner_user_id,
    executor_ids,
    start_date,
    end_date,
    help_requested_to_user_id,
    help_requested_by_user_id,
  } = body;

  const updateData: Record<string, unknown> = { updated_at: new Date().toISOString() };
  if (title !== undefined) updateData.title = title;
  if (description !== undefined) updateData.description = description;
  if (status !== undefined) updateData.status = status;
  if (priority !== undefined) updateData.priority = priority;
  if (urgency !== undefined) updateData.urgency = urgency;
  if (owner_user_id !== undefined) updateData.owner_user_id = owner_user_id;
  if (executor_ids !== undefined) updateData.executor_ids = executor_ids;
  if (start_date !== undefined) updateData.start_date = start_date;
  if (end_date !== undefined) updateData.end_date = end_date;

  if (help_requested_to_user_id !== undefined) {
    updateData.help_requested_to_user_id = help_requested_to_user_id;
    if (help_requested_to_user_id) {
      updateData.help_requested_by_user_id = help_requested_by_user_id || null;
      updateData.help_requested_at = new Date().toISOString();
    } else {
      updateData.help_requested_by_user_id = null;
      updateData.help_requested_at = null;
    }
  }

  const { data, error } = await supabase
    .from('tasks')
    .update(updateData)
    .eq('id', params.id)
    .select()
    .single();

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

  return NextResponse.json(data);
}

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

  const access = await canAccessTask(ctx!.user.id, ctx!.isAdmin, ctx!.accessibleProjectIds, params.id);
  if (!access.ok) {
    return NextResponse.json({ error: access.error }, { status: access.status });
  }

  const { error } = await supabase
    .from('tasks')
    .delete()
    .eq('id', params.id);

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

  return NextResponse.json({ success: true });
}