<?php

namespace App\Controllers\Admin;

use App\Controllers\Controller;
use App\Core\Request;
use App\Core\Response;
use App\Services\Database\Connection;
use PDO;
use Throwable;

class OpportunitiesController extends Controller
{
    private PDO $pdo;

    public function __construct(Connection $connection)
    {
        parent::__construct();
        $this->pdo = $connection->getPdo();
    }

    public function index(Request $request, Response $response): string
    {
        $type = $request->get('type', '');
        $search = $request->get('search', '');
        $status = $request->get('status', '');
        $page = max(1, (int)$request->get('page', 1));
        $perPage = 20;
        $offset = ($page - 1) * $perPage;

        $where = ['o.deleted_at IS NULL'];
        $params = [];

        if ($type) { $where[] = 'o.type = ?'; $params[] = $type; }
        if ($status) { $where[] = 'o.status = ?'; $params[] = $status; }
        if ($search) {
            $where[] = '(o.title LIKE ? OR o.description LIKE ?)';
            $params[] = "%{$search}%";
            $params[] = "%{$search}%";
        }

        $whereClause = implode(' AND ', $where);

        $stmt = $this->pdo->prepare("SELECT COUNT(*) FROM opportunities o WHERE {$whereClause}");
        $stmt->execute($params);
        $total = (int)$stmt->fetchColumn();

        $stmt = $this->pdo->prepare(
            "SELECT o.*, org.name as org_name, 
                    GROUP_CONCAT(DISTINCT t.name) as tag_names
             FROM opportunities o
             LEFT JOIN organizations org ON org.id = o.organization_id
             LEFT JOIN opportunity_tags ot ON ot.opportunity_id = o.id
             LEFT JOIN tags t ON t.id = ot.tag_id
             WHERE {$whereClause}
             GROUP BY o.id
             ORDER BY o.score DESC, o.created_at DESC
             LIMIT ? OFFSET ?"
        );
        $stmt->execute(array_merge($params, [$perPage, $offset]));
        $opportunities = $stmt->fetchAll();

        // Get type counts for sidebar
        $typeCounts = $this->pdo->query(
            "SELECT type, COUNT(*) as count FROM opportunities WHERE deleted_at IS NULL GROUP BY type"
        )->fetchAll(PDO::FETCH_KEY_PAIR);

        return $this->render('admin/opportunities/index', [
            'opportunities' => $opportunities,
            'total' => $total,
            'page' => $page,
            'perPage' => $perPage,
            'type' => $type,
            'status' => $status,
            'search' => $search,
            'typeCounts' => $typeCounts,
            'types' => ['grant', 'competition', 'demo_day', 'event', 'partnership', 'investment', 'other'],
            'statuses' => ['active', 'closed', 'expired'],
        ], 'admin');
    }

    public function show(Request $request, Response $response, int $id): string
    {
        $stmt = $this->pdo->prepare(
            "SELECT o.*, org.name as org_name, org.type as org_type, org.website_url as org_website,
                    GROUP_CONCAT(DISTINCT t.name) as tag_names
             FROM opportunities o
             LEFT JOIN organizations org ON org.id = o.organization_id
             LEFT JOIN opportunity_tags ot ON ot.opportunity_id = o.id
             LEFT JOIN tags t ON t.id = ot.tag_id
             WHERE o.id = ? AND o.deleted_at IS NULL
             GROUP BY o.id"
        );
        $stmt->execute([$id]);
        $opportunity = $stmt->fetch();

        if (!$opportunity) {
            $response->redirect('/admin/opportunities');
            return '';
        }

        // Get applications
        $stmt = $this->pdo->prepare("SELECT * FROM applications WHERE opportunity_id = ? AND deleted_at IS NULL ORDER BY created_at DESC");
        $stmt->execute([$id]);
        $applications = $stmt->fetchAll();

        return $this->render('admin/opportunities/show', [
            'opportunity' => $opportunity,
            'applications' => $applications,
        ], 'admin');
    }
}