/**
 * GET /api/activity
 *
 * Workspace-wide activity feed. Aggregates recent events across all of the
 * authenticated user's projects: agent sessions (builds), Coolify deployments,
 * and project creation/updates.
 *
 * Returns ActivityItem[] shaped for the workspace Activity page.
 */
import { NextResponse } from 'next/server';
import { authSession } from '@/lib/auth/session-server';
import { query } from '@/lib/db-postgres';

export const dynamic = 'force-dynamic';

interface ActivityItem {
  id: string;
  projectId: string;
  projectName: string;
  action: string;
  type: 'atlas' | 'build' | 'deploy' | 'user';
  createdAt: string;
}

export async function GET() {
  const session = await authSession();
  if (!session?.user?.email) {
    return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
  }

  const email = session.user.email;
  const items: ActivityItem[] = [];

  try {
    // --- Agent sessions (build / deploy events) ---
    const agentRows = await query<any>(
      `SELECT
         a.id,
         a.project_id,
         a.app_name,
         a.status,
         a.task,
         a.created_at,
         a.started_at,
         a.completed_at,
         p.data->>'productName' AS project_name,
         p.data->>'name'        AS project_name_fallback
       FROM agent_sessions a
       JOIN fs_projects p ON p.id = a.project_id
       WHERE p.user_id = $1
       ORDER BY a.created_at DESC
       LIMIT 60`,
      [email],
    ).catch(() => []);

    for (const r of agentRows) {
      const name = r.project_name || r.project_name_fallback || 'Untitled';
      const status = r.status as string;
      const type: ActivityItem['type'] =
        status === 'completed' || status === 'failed' ? 'deploy' : 'build';
      const verb =
        status === 'completed'
          ? 'Deployed'
          : status === 'failed'
          ? 'Deploy failed for'
          : status === 'running'
          ? 'Building'
          : 'Queued build for';
      items.push({
        id: `agent-${r.id}`,
        projectId: r.project_id,
        projectName: name,
        action: `${verb} ${r.app_name || 'app'}`,
        type,
        createdAt: (r.completed_at || r.started_at || r.created_at).toISOString(),
      });
    }

    // --- Project creation / significant updates ---
    const projectRows = await query<any>(
      `SELECT id, data, created_at, updated_at
       FROM fs_projects
       WHERE user_id = $1
       ORDER BY created_at DESC
       LIMIT 40`,
      [email],
    ).catch(() => []);

    for (const r of projectRows) {
      const name = r.data?.productName || r.data?.name || 'Untitled';
      items.push({
        id: `project-created-${r.id}`,
        projectId: r.id,
        projectName: name,
        action: `Created project "${name}"`,
        type: 'user',
        createdAt: r.created_at.toISOString(),
      });

      // If there's a notable status change in data, surface it
      const status = r.data?.status;
      if (status && status !== 'defining') {
        items.push({
          id: `project-status-${r.id}`,
          projectId: r.id,
          projectName: name,
          action: `Project moved to "${status}"`,
          type: 'atlas',
          createdAt: r.updated_at.toISOString(),
        });
      }
    }

    // Sort all items by date descending, cap at 80
    items.sort(
      (a, b) => new Date(b.createdAt).getTime() - new Date(a.createdAt).getTime(),
    );

    return NextResponse.json({ items: items.slice(0, 80) });
  } catch (err) {
    console.error('[/api/activity]', err);
    return NextResponse.json({ items: [] });
  }
}