<?php

declare(strict_types=1);

namespace App\Controllers;

use App\Core\Controller;
use App\Core\Http\Request;
use App\Core\Http\Response;
use App\Core\Auth;
use App\Models\DailySession;
use App\Models\SessionMenu;
use App\Models\EmployeeOrder;
use App\Models\User;

class SessionController extends Controller
{
    public function index(Request $request, Response $response): string|Response
    {
        if (!Auth::check()) {
            return $this->redirect('/login');
        }

        $activeSessions = DailySession::getActiveSessions();
        $pastSessions = DailySession::all();

        return $this->render('sessions/index', [
            'title' => 'Food & Canteen Sessions Hub',
            'activeSessions' => $activeSessions,
            'pastSessions' => $pastSessions,
            'currentUser' => Auth::user(),
        ]);
    }

    public function createForm(Request $request, Response $response): string|Response
    {
        if (!Auth::check()) {
            return $this->redirect('/login');
        }

        return $this->render('sessions/create', [
            'title' => 'Start New Food Session',
            'currentUser' => Auth::user(),
        ]);
    }

    public function store(Request $request, Response $response): Response
    {
        if (!Auth::check()) {
            return $this->redirect('/login');
        }

        $creatorId = (int)Auth::id();
        $title = trim((string)$request->post('title', ''));
        $canteenName = trim((string)$request->post('canteen_name', ''));
        $sessionDate = trim((string)$request->post('session_date', date('Y-m-d')));
        $notes = trim((string)$request->post('notes', ''));
        $menuText = trim((string)$request->post('menu_text', ''));

        if (empty($title) || empty($canteenName)) {
            return $this->redirect('/sessions/create', null, 'Please provide session title and canteen name.');
        }

        try {
            $sessionId = DailySession::create($creatorId, $title, $canteenName, $sessionDate, $notes);

            // Add menu items if provided
            if (!empty($menuText)) {
                $lines = explode("\n", $menuText);
                foreach ($lines as $line) {
                    $clean = preg_replace('/^(\d+[\.\)]\s*|[\-\*•]\s*)/u', '', trim($line));
                    $clean = trim((string)$clean);
                    if (!empty($clean)) {
                        SessionMenu::add($sessionId, $clean);
                    }
                }
            }

            return $this->redirect("/sessions/{$sessionId}", 'Food session created! Share it with your colleagues.');
        } catch (\Throwable $e) {
            return $this->redirect('/sessions/create', null, 'Failed to create session: ' . $e->getMessage());
        }
    }

    public function show(Request $request, Response $response, array $params): string|Response
    {
        if (!Auth::check()) {
            return $this->redirect('/login');
        }

        $id = (int)($params['id'] ?? 0);
        $session = DailySession::find($id);

        if (!$session) {
            return $this->redirect('/', null, 'Food session not found.');
        }

        $currentUser = Auth::user();
        $myOrder = EmployeeOrder::findUserOrderBySession($id, (int)$currentUser['id']);

        return $this->render('sessions/show', [
            'title' => e($session['title']),
            'session' => $session,
            'currentUser' => $currentUser,
            'myOrder' => $myOrder,
            'isCreator' => (int)$session['creator_id'] === (int)$currentUser['id'],
        ]);
    }

    public function history(Request $request, Response $response): string|Response
    {
        if (!Auth::check()) {
            return $this->redirect('/login');
        }

        $sessions = DailySession::all();
        return $this->render('sessions/history', [
            'title' => 'All Past Sessions History',
            'sessions' => $sessions,
        ]);
    }

    public function updateStatus(Request $request, Response $response, array $params): Response
    {
        if (!Auth::check()) {
            return $this->redirect('/login');
        }

        $id = (int)($params['id'] ?? 0);
        $status = $request->post('status');

        $valid = ['open', 'closed', 'arrived', 'completed'];
        if (in_array($status, $valid, true)) {
            DailySession::updateStatus($id, $status);
            return $this->redirect("/sessions/{$id}", "Session status updated to: " . strtoupper($status));
        }

        return $this->redirect("/sessions/{$id}", null, 'Invalid status.');
    }

    public function addMenu(Request $request, Response $response, array $params): Response
    {
        if (!Auth::check()) {
            return $this->redirect('/login');
        }

        $id = (int)($params['id'] ?? 0);
        $rawText = trim((string)$request->post('menu_text', ''));

        if (!empty($rawText)) {
            $lines = explode("\n", $rawText);
            $added = 0;
            foreach ($lines as $line) {
                $clean = preg_replace('/^(\d+[\.\)]\s*|[\-\*•]\s*)/u', '', trim($line));
                $clean = trim((string)$clean);
                if (!empty($clean)) {
                    SessionMenu::add($id, $clean);
                    $added++;
                }
            }
            return $this->redirect("/sessions/{$id}", "Added {$added} menu item(s).");
        }

        return $this->redirect("/sessions/{$id}", null, 'Please provide menu items.');
    }

    public function deleteMenu(Request $request, Response $response, array $params): Response
    {
        if (!Auth::check()) {
            return $this->redirect('/login');
        }

        $sessionId = (int)($params['id'] ?? 0);
        $menuId = (int)$request->post('menu_id');

        SessionMenu::delete($menuId);
        return $this->redirect("/sessions/{$sessionId}", 'Menu item removed.');
    }

    public function settlePrices(Request $request, Response $response, array $params): Response
    {
        if (!Auth::check()) {
            return $this->redirect('/login');
        }

        $sessionId = (int)($params['id'] ?? 0);
        $prices = $request->post('prices', []);

        if (is_array($prices)) {
            SessionMenu::updatePricesAndRecalculate($sessionId, $prices);
            DailySession::updateStatus($sessionId, 'arrived');
            return $this->redirect("/sessions/{$sessionId}", 'Prices saved and personal bills computed!');
        }

        return $this->redirect("/sessions/{$sessionId}", null, 'Failed to update prices.');
    }
}