<?php
require_once __DIR__ . '/../db/config.php';

function render_match_card($match) {
    $pdo = db();
    $stmt = $pdo->prepare('
        SELECT t.name 
        FROM teams t
        JOIN match_teams mt ON t.id = mt.team_id
        WHERE mt.match_id = ?
    ');
    $stmt->execute([$match['id']]);
    $teams = $stmt->fetchAll(PDO::FETCH_COLUMN);

    $match_date = new DateTime($match['match_datetime']);
    $formatted_date = $match_date->format('D, M j, Y ');
    $formatted_time = $match_date->format('g:i A');

    $teams_html = '';
    if (count($teams) > 0) {
        $teams_html = '<p class="card-text">Teams: ' . htmlspecialchars(implode(', ', $teams)) . '</p>';
    }

    return '<div class="card">
        <div class="card-body">
            <h5 class="card-title">' . htmlspecialchars($match['match_type']) . '</h5>
            <p class="card-text">' . htmlspecialchars($match['location']) . '</p>
            <p class="card-text">' . $formatted_date . ' at ' . $formatted_time . '</p>'
            . $teams_html .
            '<a href="match_view.php?id=' . $match['id'] . '" class="btn btn-primary">View Details</a>
        </div>
    </div>';
}

header('Content-Type: application/json');

$action = $_GET['action'] ?? '';

switch ($action) {
    case 'create':
        $pdo = db();
        try {
            $pdo->beginTransaction();

            // Insert match
            $stmt = $pdo->prepare("INSERT INTO matches (match_datetime, location, match_type) VALUES (?, ?, ?)");
            $stmt->execute([
                $_POST['match_datetime'],
                $_POST['location'],
                $_POST['match_type']
            ]);
            $match_id = $pdo->lastInsertId();

            // Handle teams
            $teams = $_POST['teams'] ?? [];
            foreach ($teams as $team_input) {
                $team_id = null;
                if (is_numeric($team_input)) {
                    // Existing team
                    $team_id = (int)$team_input;
                } else {
                    // New team, check if it exists
                    $stmt = $pdo->prepare("SELECT id FROM teams WHERE name = ?");
                    $stmt->execute([$team_input]);
                    $existing_team = $stmt->fetch();
                    if ($existing_team) {
                        $team_id = $existing_team['id'];
                    } else {
                        // Insert new team
                        $stmt = $pdo->prepare("INSERT INTO teams (name) VALUES (?)");
                        $stmt->execute([$team_input]);
                        $team_id = $pdo->lastInsertId();
                    }
                }

                if ($team_id) {
                    $stmt = $pdo->prepare("INSERT INTO match_teams (match_id, team_id) VALUES (?, ?)");
                    $stmt->execute([$match_id, $team_id]);
                }
            }

            $pdo->commit();
            echo json_encode(['success' => true]);
        } catch (PDOException $e) {
            $pdo->rollBack();
            echo json_encode(['success' => false, 'error' => $e->getMessage()]);
        }
        break;

    case 'load_more':
        $section = $_GET['section'] ?? '';
        $offset = (int)($_GET['offset'] ?? 0);
        $limit = 10;
        $sql = '';

        switch ($section) {
            case 'upcoming':
                $sql = "SELECT * FROM matches WHERE match_datetime > NOW() ORDER BY match_datetime ASC LIMIT ? OFFSET ?";
                break;
            case 'recent':
                $sql = "SELECT * FROM matches WHERE match_datetime <= NOW() AND match_datetime >= NOW() - INTERVAL 2 WEEK ORDER BY match_datetime DESC LIMIT ? OFFSET ?";
                break;
            case 'past':
                $sql = "SELECT * FROM matches WHERE match_datetime < NOW() - INTERVAL 2 WEEK ORDER BY match_datetime DESC LIMIT ? OFFSET ?";
                break;
        }

        if ($sql) {
            $pdo = db();
            $stmt = $pdo->prepare($sql);
            $load_limit = $limit + 1;
            $stmt->bindParam(1, $load_limit, PDO::PARAM_INT);
            $stmt->bindParam(2, $offset, PDO::PARAM_INT);
            $stmt->execute();
            $matches = $stmt->fetchAll();

            $has_more = count($matches) > $limit;
            if ($has_more) {
                array_pop($matches); // Remove the extra match
            }
            
            $rendered_matches = [];
            foreach($matches as $match) {
                $rendered_matches[] = render_match_card($match);
            }

            echo json_encode(['matches' => $rendered_matches, 'has_more' => $has_more]);
        } else {
            echo json_encode(['matches' => [], 'has_more' => false]);
        }
        break;

    case 'get':
        try {
            $pdo = db();
            $stmt = $pdo->prepare("SELECT * FROM matches WHERE id = ?");
            $stmt->execute([$_GET['id']]);
            $match = $stmt->fetch(PDO::FETCH_ASSOC);

            $stmt = $pdo->prepare("SELECT team_id FROM match_teams WHERE match_id = ?");
            $stmt->execute([$_GET['id']]);
            $teams = $stmt->fetchAll(PDO::FETCH_COLUMN);
            $match['teams'] = $teams;

            echo json_encode(['success' => true, 'match' => $match]);
        } catch (PDOException $e) {
            echo json_encode(['success' => false, 'error' => $e->getMessage()]);
        }
        break;

    case 'update':
        $pdo = db();
        try {
            $pdo->beginTransaction();

            // Update match
            $stmt = $pdo->prepare("UPDATE matches SET match_datetime = ?, location = ?, match_type = ? WHERE id = ?");
            $stmt->execute([
                $_POST['match_datetime'],
                $_POST['location'],
                $_POST['match_type'],
                $_POST['match_id']
            ]);

            $match_id = $_POST['match_id'];

            // Delete old team associations
            $stmt = $pdo->prepare("DELETE FROM match_teams WHERE match_id = ?");
            $stmt->execute([$match_id]);

            // Handle teams
            $teams = $_POST['teams'] ?? [];
            foreach ($teams as $team_input) {
                $team_id = null;
                if (is_numeric($team_input)) {
                    // Existing team
                    $team_id = (int)$team_input;
                } else {
                    // New team, check if it exists
                    $stmt = $pdo->prepare("SELECT id FROM teams WHERE name = ?");
                    $stmt->execute([$team_input]);
                    $existing_team = $stmt->fetch();
                    if ($existing_team) {
                        $team_id = $existing_team['id'];
                    } else {
                        // Insert new team
                        $stmt = $pdo->prepare("INSERT INTO teams (name) VALUES (?)");
                        $stmt->execute([$team_input]);
                        $team_id = $pdo->lastInsertId();
                    }
                }

                if ($team_id) {
                    $stmt = $pdo->prepare("INSERT INTO match_teams (match_id, team_id) VALUES (?, ?)");
                    $stmt->execute([$match_id, $team_id]);
                }
            }

            $pdo->commit();
            echo json_encode(['success' => true]);
        } catch (PDOException $e) {
            $pdo->rollBack();
            echo json_encode(['success' => false, 'error' => $e->getMessage()]);
        }
        break;

    case 'delete':
        try {
            $pdo = db();
            $stmt = $pdo->prepare("DELETE FROM matches WHERE id = ?");
            $stmt->execute([$_GET['id']]);
            echo json_encode(['success' => true]);
        } catch (PDOException $e) {
            echo json_encode(['success' => false, 'error' => $e->getMessage()]);
        }
        break;

    default:
        echo json_encode(['success' => false, 'error' => 'Invalid action']);
        break;
}