<?php

class HabitController
{
    public function dashboard(): void
    {
        require_login();

        $filters = [
            'category_id' => $_GET['category_id'] ?? '',
            'status' => $_GET['status'] ?? '',
        ];

        View::render('habits/dashboard', [
            'habits' => Habit::allForUser(current_user_id(), $filters),
            'categories' => Category::all(),
            'filters' => $filters,
        ]);
    }

    public function create(): void
    {
        require_login();

        View::render('habits/form', [
            'habit' => null,
            'categories' => Category::all(),
            'errors' => [],
        ]);
    }

    public function store(): void
    {
        require_login();
        verify_csrf_token();

        $data = $this->validatedData();

        if (!empty($data['errors'])) {
            View::render('habits/form', [
                'habit' => $_POST,
                'categories' => Category::all(),
                'errors' => $data['errors'],
            ]);
            return;
        }

        Habit::create(current_user_id(), $data);
        flash('success', 'Habit wurde erstellt.');
        redirect('dashboard');
    }

    public function edit(): void
    {
        require_login();

        $habit = Habit::findForUser((int) ($_GET['id'] ?? 0), current_user_id());

        if (!$habit) {
            flash('error', 'Habit wurde nicht gefunden.');
            redirect('dashboard');
        }

        View::render('habits/form', [
            'habit' => $habit,
            'categories' => Category::all(),
            'errors' => [],
        ]);
    }

    public function update(): void
    {
        require_login();
        verify_csrf_token();

        $id = (int) ($_POST['id'] ?? 0);
        $data = $this->validatedData();

        if (!empty($data['errors'])) {
            View::render('habits/form', [
                'habit' => array_merge($_POST, ['id' => $id]),
                'categories' => Category::all(),
                'errors' => $data['errors'],
            ]);
            return;
        }

        Habit::update($id, current_user_id(), $data);
        flash('success', 'Habit wurde gespeichert.');
        redirect('dashboard');
    }

    public function delete(): void
    {
        require_login();
        verify_csrf_token();

        Habit::delete((int) ($_POST['id'] ?? 0), current_user_id());
        flash('success', 'Habit wurde geloescht.');
        redirect('dashboard');
    }

    public function toggle(): void
    {
        require_login();
        verify_csrf_token();

        Habit::toggleToday((int) ($_POST['id'] ?? 0), current_user_id());
        redirect('dashboard');
    }

    private function validatedData(): array
    {
        $title = trim($_POST['title'] ?? '');
        $description = trim($_POST['description'] ?? '');
        $categoryId = $_POST['category_id'] ?? '';
        $targetPerWeek = (int) ($_POST['target_per_week'] ?? 0);
        $errors = [];

        if ($title === '') {
            $errors['title'] = 'Bitte gib einen Namen fuer den Habit ein.';
        }

        if ($targetPerWeek < 1 || $targetPerWeek > 7) {
            $errors['target_per_week'] = 'Bitte waehle einen Wert zwischen 1 und 7.';
        }

        return [
            'title' => $title,
            'description' => $description,
            'category_id' => $categoryId,
            'target_per_week' => $targetPerWeek,
            'errors' => $errors,
        ];
    }
}