<?php
/**
 * AJAX API voor Brainstorm Sessies, Kaarten & Omzetten naar Roadmap
 */

require_once __DIR__ . '/../includes/auth.php';
$user = require_auth();
$db = get_db_connection();

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

$action = $_GET['action'] ?? ($_POST['action'] ?? '');

try {
    // 1. Brainstormkaart toevoegen
    if ($action === 'add_card') {
        $data = json_decode(file_get_contents('php://input'), true);
        $sessionId = (int)($data['session_id'] ?? 0);
        $content = trim($data['content'] ?? '');
        $category = $data['category'] ?? 'Ideeën';
        $color = $data['color'] ?? 'amber';

        if (empty($content)) {
            echo json_encode(['error' => 'Inhoud is verplicht']);
            exit;
        }

        $stmt = $db->prepare("
            INSERT INTO brainstorm_cards (session_id, content, category, color, author_name, votes)
            VALUES (?, ?, ?, ?, ?, 0)
        ");
        $stmt->execute([$sessionId, $content, $category, $color, $user['name']]);
        $cardId = (int)$db->lastInsertId();

        echo json_encode([
            'success' => true,
            'card' => [
                'id' => $cardId,
                'content' => $content,
                'category' => $category,
                'color' => $color,
                'author_name' => $user['name'],
                'votes' => 0,
                'converted_to_roadmap_item_id' => null
            ]
        ]);
        exit;
    }

    // 2. Stemmen / Upvote op kaart (met bescherming tegen oneindig stemmen)
    if ($action === 'vote_card') {
        $data = json_decode(file_get_contents('php://input'), true);
        $cardId = (int)($data['card_id'] ?? 0);

        if (!isset($_SESSION['voted_cards'])) {
            $_SESSION['voted_cards'] = [];
        }

        if (in_array($cardId, $_SESSION['voted_cards'])) {
            $stmtVotes = $db->prepare("SELECT votes FROM brainstorm_cards WHERE id = ?");
            $stmtVotes->execute([$cardId]);
            $votes = (int)$stmtVotes->fetchColumn();
            echo json_encode(['success' => false, 'error' => 'U heeft al op deze kaart gestemd.', 'votes' => $votes]);
            exit;
        }

        $_SESSION['voted_cards'][] = $cardId;

        $stmt = $db->prepare("UPDATE brainstorm_cards SET votes = votes + 1 WHERE id = ?");
        $stmt->execute([$cardId]);

        $stmtVotes = $db->prepare("SELECT votes FROM brainstorm_cards WHERE id = ?");
        $stmtVotes->execute([$cardId]);
        $votes = (int)$stmtVotes->fetchColumn();

        echo json_encode(['success' => true, 'votes' => $votes]);
        exit;
    }

    // 3. Kaart verwijderen (met autorisatiecontrole: auteur, sessie-eigenaar of beheerder)
    if ($action === 'delete_card') {
        $data = json_decode(file_get_contents('php://input'), true);
        $cardId = (int)($data['card_id'] ?? 0);

        $stmtCheck = $db->prepare("
            SELECT c.*, s.created_by_id as session_owner_id 
            FROM brainstorm_cards c
            JOIN brainstorm_sessions s ON c.session_id = s.id
            WHERE c.id = ?
        ");
        $stmtCheck->execute([$cardId]);
        $card = $stmtCheck->fetch();

        if (!$card) {
            echo json_encode(['error' => 'Kaart niet gevonden']);
            exit;
        }

        $isAuthor = ($card['author_name'] === $user['name']);
        $isSessionOwner = ((int)$card['session_owner_id'] === (int)$user['id']);
        $isAdmin = ($user['role'] === 'ADMIN');

        if (!$isAuthor && !$isSessionOwner && !$isAdmin) {
            http_response_code(403);
            echo json_encode(['error' => 'Geen toestemming om deze kaart te verwijderen.']);
            exit;
        }

        $stmt = $db->prepare("DELETE FROM brainstorm_cards WHERE id = ?");
        $stmt->execute([$cardId]);

        echo json_encode(['success' => true]);
        exit;
    }

    // 3b. Kaart verplaatsen naar andere categorie/lane (Drag & Drop)
    if ($action === 'move_card') {
        $data = json_decode(file_get_contents('php://input'), true);
        $cardId = (int)($data['card_id'] ?? 0);
        $category = trim($data['category'] ?? '');

        $validCategories = ['Ideeën', 'Knelpunten', 'Oplossingen', 'Quick Wins'];
        if (!$cardId || !in_array($category, $validCategories, true)) {
            echo json_encode(['error' => 'Ongeldige kaart of categorie']);
            exit;
        }

        // Bepaal kleur behorend bij de nieuwe categorie
        $colorMap = [
            'Ideeën' => 'amber',
            'Knelpunten' => 'rose',
            'Oplossingen' => 'teal',
            'Quick Wins' => 'indigo'
        ];
        $newColor = $colorMap[$category] ?? 'amber';

        $stmt = $db->prepare("UPDATE brainstorm_cards SET category = ?, color = ? WHERE id = ?");
        $stmt->execute([$category, $newColor, $cardId]);

        echo json_encode([
            'success' => true,
            'card_id' => $cardId,
            'category' => $category,
            'color' => $newColor
        ]);
        exit;
    }

    // 4. Omzetten naar Roadmap!
    if ($action === 'convert_to_roadmap') {
        $data = json_decode(file_get_contents('php://input'), true);
        $cardIds = $data['card_ids'] ?? [];
        $quarter = $data['quarter'] ?? 'Q3';
        $type = $data['type'] ?? 'FEATURE';
        $priority = $data['priority'] ?? 'MEDIUM';
        $dueDate = !empty($data['due_date']) ? $data['due_date'] : null;

        if (empty($cardIds) || !is_array($cardIds)) {
            echo json_encode(['error' => 'Selecteer ten minste één kaart om om te zetten.']);
            exit;
        }

        $db->beginTransaction();

        $convertedCount = 0;
        foreach ($cardIds as $cardId) {
            $cardId = (int)$cardId;
            $stmtCard = $db->prepare("SELECT * FROM brainstorm_cards WHERE id = ?");
            $stmtCard->execute([$cardId]);
            $card = $stmtCard->fetch();

            if ($card) {
                // Maak titel (eerste zin of max 80 tekens)
                $firstLine = explode("\n", trim($card['content']))[0];
                $title = mb_substr($firstLine, 0, 80);

                $stmtRoadmap = $db->prepare("
                    INSERT INTO roadmap_items (title, description, type, status, quarter, priority, progress, due_date, origin_brainstorm_card_id, created_by_id)
                    VALUES (?, ?, ?, 'PLANNED', ?, ?, 0, ?, ?, ?)
                ");
                $stmtRoadmap->execute([
                    $title,
                    $card['content'],
                    $type,
                    $quarter,
                    $priority,
                    $dueDate,
                    $cardId,
                    $user['id']
                ]);
                $roadmapId = (int)$db->lastInsertId();

                // Koppel terug aan brainstorm kaart
                $stmtUpdateCard = $db->prepare("UPDATE brainstorm_cards SET converted_to_roadmap_item_id = ? WHERE id = ?");
                $stmtUpdateCard->execute([$roadmapId, $cardId]);

                $convertedCount++;
            }
        }

        $db->commit();

        echo json_encode([
            'success' => true,
            'message' => "{$convertedCount} brainstorm items succesvol omgezet naar de Roadmap!",
            'converted_count' => $convertedCount
        ]);
        exit;
    }

    echo json_encode(['error' => 'Onbekende actie']);
} catch (Exception $e) {
    if ($db->inTransaction()) $db->rollBack();
    http_response_code(500);
    echo json_encode(['error' => $e->getMessage()]);
}