<?php
/**
 * AJAX API voor AI Co-Pilot (Release v1.5)
 */

require_once __DIR__ . '/../includes/auth.php';
require_once __DIR__ . '/../includes/ai.php';
require_once __DIR__ . '/../includes/settings.php';

$user = require_auth();
$db = get_db_connection();

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

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

try {
    // 1. Auto-categoriseer kaartjes in een brainstormsessie
    if ($action === 'categorize_cards') {
        $data = json_decode(file_get_contents('php://input'), true);
        $sessionId = (int)($data['session_id'] ?? 0);

        if (!$sessionId) {
            echo json_encode(['error' => 'Sessie ID ontbreekt']);
            exit;
        }

        $stmtSession = $db->prepare("SELECT * FROM brainstorm_sessions WHERE id = ?");
        $stmtSession->execute([$sessionId]);
        $session = $stmtSession->fetch();

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

        $stmtCards = $db->prepare("SELECT id, content, category FROM brainstorm_cards WHERE session_id = ?");
        $stmtCards->execute([$sessionId]);
        $cards = $stmtCards->fetchAll();

        if (empty($cards)) {
            echo json_encode(['error' => 'Er zijn nog geen kaartjes op het canvas om te categoriseren']);
            exit;
        }

        $aiRes = fociz_ai_categorize_cards($session['title'], $session['theme'] ?? 'Algemeen', $cards);

        if (!$aiRes['success']) {
            echo json_encode(['error' => $aiRes['error']]);
            exit;
        }

        $validCategories = ['Ideeën', 'Knelpunten', 'Oplossingen', 'Quick Wins'];
        $updateStmt = $db->prepare("UPDATE brainstorm_cards SET category = ? WHERE id = ? AND session_id = ?");
        $updatedCount = 0;

        foreach ($aiRes['categorized'] as $item) {
            $cardId = (int)($item['id'] ?? 0);
            $newCat = trim($item['category'] ?? '');
            if ($cardId > 0 && in_array($newCat, $validCategories)) {
                $updateStmt->execute([$newCat, $cardId, $sessionId]);
                $updatedCount++;
            }
        }

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

    // 2. Automatisch ideeën genereren voor een sessie
    if ($action === 'generate_ideas') {
        $data = json_decode(file_get_contents('php://input'), true);
        $sessionId = (int)($data['session_id'] ?? 0);
        $count = min(6, max(2, (int)($data['count'] ?? 4)));

        if (!$sessionId) {
            echo json_encode(['error' => 'Sessie ID ontbreekt']);
            exit;
        }

        $stmtSession = $db->prepare("SELECT * FROM brainstorm_sessions WHERE id = ?");
        $stmtSession->execute([$sessionId]);
        $session = $stmtSession->fetch();

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

        $aiRes = fociz_ai_generate_ideas($session['title'], $session['theme'] ?? 'Algemeen', $count);

        if (!$aiRes['success']) {
            echo json_encode(['error' => $aiRes['error']]);
            exit;
        }

        $insertStmt = $db->prepare("
            INSERT INTO brainstorm_cards (session_id, content, category, color, author_name, votes)
            VALUES (?, ?, 'Ideeën', 'amber', ?, 1)
        ");

        $createdCards = [];
        $authorName = 'AI Co-Pilot';

        foreach ($aiRes['ideas'] as $ideaText) {
            $ideaText = trim($ideaText);
            if (!empty($ideaText)) {
                $insertStmt->execute([$sessionId, $ideaText, $authorName]);
                $createdCards[] = [
                    'id'          => (int)$db->lastInsertId(),
                    'content'     => $ideaText,
                    'category'    => 'Ideeën',
                    'color'       => 'amber',
                    'author_name' => $authorName,
                    'votes'       => 1,
                ];
            }
        }

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

    // 3. Brainstorm notitie omzetten naar Roadmap Item
    if ($action === 'summarize_to_roadmap') {
        $data = json_decode(file_get_contents('php://input'), true);
        $content = trim($data['content'] ?? '');
        $sessionTitle = trim($data['session_title'] ?? '');

        if (empty($content)) {
            echo json_encode(['error' => 'Geen inhoud opgegeven om samen te vatten']);
            exit;
        }

        $aiRes = fociz_ai_summarize_to_roadmap($content, $sessionTitle);

        if (!$aiRes['success']) {
            echo json_encode(['error' => $aiRes['error']]);
            exit;
        }

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

    // 4. Slimme dagindeling berekenen voor taken rondom Outlook afspraken
    if ($action === 'smart_schedule') {
        $data = json_decode(file_get_contents('php://input'), true);
        $date = !empty($data['date']) ? trim($data['date']) : date('Y-m-d');

        // Haal daily plan op
        $stmtPlan = $db->prepare("SELECT id FROM daily_plans WHERE user_id = ? AND plan_date = ?");
        $stmtPlan->execute([$user['id'], $date]);
        $plan = $stmtPlan->fetch();
        $planId = $plan['id'] ?? 0;

        // Haal openstaande taken op voor de dag (inclusief fallback voor ongebonden taken op de huidige dag)
        $isToday = ($date === date('Y-m-d'));
        $stmtTasks = $db->prepare("
            SELECT t.id, t.title, t.priority, t.duration_minutes
            FROM tasks t
            WHERE t.user_id = ? AND (t.daily_plan_id = ? " . ($isToday ? "OR t.daily_plan_id IS NULL" : "") . ") AND t.is_completed = 0
            ORDER BY t.priority ASC, t.created_at ASC
        ");
        $stmtTasks->execute([$user['id'], $planId]);
        $tasks = $stmtTasks->fetchAll();

        if (empty($tasks)) {
            echo json_encode(['error' => 'Geen openstaande taken gevonden om in te delen']);
            exit;
        }

        require_once __DIR__ . '/../includes/integrations/microsoft.php';
        $events = microsoft_fetch_today_events($user['id'], $date);
        $workdaySettings = get_workday_settings();

        $aiRes = fociz_ai_smart_schedule($tasks, $events, $workdaySettings);

        if (!$aiRes['success']) {
            echo json_encode(['error' => $aiRes['error']]);
            exit;
        }

        // Werk de tijdsblokken bij in MariaDB
        $updateStmt = $db->prepare("
            UPDATE tasks 
            SET time_block_start = ?, 
                duration_minutes = COALESCE(?, duration_minutes)
            WHERE id = ? AND user_id = ?
        ");

        $scheduledCount = 0;
        foreach ($aiRes['scheduled'] as $s) {
            $taskId = (int)($s['id'] ?? 0);
            $startTime = trim($s['time_block_start'] ?? '');
            $duration = !empty($s['duration_minutes']) ? (int)$s['duration_minutes'] : null;

            if ($taskId > 0 && preg_match('/^\d{1,2}:\d{2}$/', $startTime)) {
                $updateStmt->execute([$startTime, $duration, $taskId, $user['id']]);
                $scheduledCount++;
            }
        }

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

    // 5. Persoonlijke AI Dagbriefing genereren
    if ($action === 'daily_briefing') {
        $data = json_decode(file_get_contents('php://input'), true);
        $date = !empty($data['date']) ? trim($data['date']) : date('Y-m-d');
        $today = date('Y-m-d');

        // Haal openstaande taken van vandaag op
        $stmtPlan = $db->prepare("SELECT id FROM daily_plans WHERE user_id = ? AND plan_date = ?");
        $stmtPlan->execute([$user['id'], $date]);
        $planId = $stmtPlan->fetchColumn();

        $isToday = ($date === $today);
        $taskFilter = $planId
            ? "t.daily_plan_id = " . (int)$planId . ($isToday ? " OR t.daily_plan_id IS NULL" : "")
            : ($isToday ? "t.daily_plan_id IS NULL" : "1=0");

        $tasks = $db->query("
            SELECT id, title, priority, time_block_start, duration_minutes
            FROM tasks
            WHERE user_id = {$user['id']} AND is_completed = 0 AND ({$taskFilter})
            ORDER BY priority ASC, time_block_start ASC
            LIMIT 15
        ")->fetchAll();

        // Haal gisteren niet-voltooide taken op
        $yesterday = date('Y-m-d', strtotime('-1 day', strtotime($date)));
        $stmtYest = $db->prepare("SELECT id FROM daily_plans WHERE user_id = ? AND plan_date = ?");
        $stmtYest->execute([$user['id'], $yesterday]);
        $yesterdayPlanId = $stmtYest->fetchColumn();
        $unfinishedYest = [];
        if ($yesterdayPlanId) {
            $stmtUnf = $db->prepare("
                SELECT title FROM tasks
                WHERE user_id = ? AND daily_plan_id = ? AND is_completed = 0
                LIMIT 5
            ");
            $stmtUnf->execute([$user['id'], $yesterdayPlanId]);
            $unfinishedYest = $stmtUnf->fetchAll();
        }

        // Haal Outlook meetings op als beschikbaar
        $meetings = [];
        try {
            require_once __DIR__ . '/../includes/integrations/microsoft.php';
            $meetings = microsoft_fetch_today_events($user['id'], $date);
        } catch (Throwable $e) {
            // meetings niet beschikbaar, geen probleem
        }

        // Haal urgente Jira tickets op als beschikbaar
        $jiraIssues = [];
        try {
            require_once __DIR__ . '/../includes/integrations/jira.php';
            $jiraData = jira_get_dashboard_data($user['id'], false);
            $jiraIssues = array_merge(
                $jiraData['assigned_issues'] ?? [],
                $jiraData['team_issues'] ?? []
            );
        } catch (Throwable $e) {
            // Jira niet beschikbaar, geen probleem
        }

        $aiSettings = get_ai_settings();
        if (empty($aiSettings['ai_enabled']) || empty($aiSettings['has_key'])) {
            echo json_encode(['error' => 'AI Co-Pilot is niet geconfigureerd']);
            exit;
        }

        $aiRes = fociz_ai_daily_briefing(
            $user['name'] ?? 'Jij',
            $date,
            $tasks,
            $meetings,
            $jiraIssues,
            $unfinishedYest
        );

        if (!$aiRes['success']) {
            echo json_encode(['error' => $aiRes['error']]);
            exit;
        }

        echo json_encode([
            'success'    => true,
            'greeting'   => $aiRes['greeting'],
            'focus_task' => $aiRes['focus_task'],
            'tip'        => $aiRes['tip'],
            'warnings'   => $aiRes['warnings'],
            'date'       => $date,
        ]);
        exit;
    }

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