<?php

declare(strict_types=1);

namespace App\Controllers;

use App\Core\Auth;
use App\Core\DB;

class TaskFileController
{
    public function upload(): void
    {
        if (!Auth::check()) {
            if ($this->isAjax()) {
                $this->json(['success' => false, 'message' => 'Unauthorized'], 403);
            }

            header('Location: /login');
            exit;
        }

        $taskId = (int)($_POST['task_id'] ?? 0);

        if ($taskId <= 0 || empty($_FILES['file'])) {
            if ($this->isAjax()) {
                $this->json(['success' => false, 'message' => 'Файл не выбран'], 400);
            }

            $_SESSION['error'] = 'Файл не выбран';
            header('Location: /tasks');
            exit;
        }

        $file = $_FILES['file'];

        if (($file['error'] ?? UPLOAD_ERR_NO_FILE) !== UPLOAD_ERR_OK) {
            if ($this->isAjax()) {
                $this->json(['success' => false, 'message' => 'Ошибка загрузки файла'], 400);
            }

            $_SESSION['error'] = 'Ошибка загрузки файла';
            header('Location: /tasks');
            exit;
        }

        $uploadDir = __DIR__ . '/../../storage/uploads/tasks/' . $taskId;

        if (!is_dir($uploadDir)) {
            mkdir($uploadDir, 0775, true);
        }

        $originalName = (string)$file['name'];
        $tmpName = (string)$file['tmp_name'];
        $extension = pathinfo($originalName, PATHINFO_EXTENSION);
        $storedName = uniqid('task_', true) . ($extension ? '.' . $extension : '');
        $targetPath = $uploadDir . '/' . $storedName;

        if (!move_uploaded_file($tmpName, $targetPath)) {
            if ($this->isAjax()) {
                $this->json(['success' => false, 'message' => 'Не удалось сохранить файл'], 500);
            }

            $_SESSION['error'] = 'Не удалось сохранить файл';
            header('Location: /tasks');
            exit;
        }

        $relativePath = 'storage/uploads/tasks/' . $taskId . '/' . $storedName;
        $fileSize = (int)filesize($targetPath);
        $mimeType = mime_content_type($targetPath) ?: null;

        $pdo = DB::connection();

        $stmt = $pdo->prepare("
        INSERT INTO task_files (
            task_id,
            uploaded_by,
            original_name,
            stored_name,
            file_path,
            file_size,
            mime_type,
            created_at
        ) VALUES (?, ?, ?, ?, ?, ?, ?, NOW())
    ");
        $stmt->execute([
            $taskId,
            Auth::user()['id'],
            $originalName,
            $storedName,
            $relativePath,
            $fileSize,
            $mimeType,
        ]);

        if ($this->isAjax()) {
            $this->json([
                'success' => true,
                'task_id' => $taskId,
            ]);
        }

        header('Location: /tasks');
        exit;
    }

    public function download(): void
    {
        if (!Auth::check()) {
            header('Location: /login');
            exit;
        }

        $fileId = (int)($_GET['id'] ?? 0);

        if ($fileId <= 0) {
            http_response_code(404);
            echo 'Файл не найден';
            return;
        }

        $pdo = DB::connection();

        $stmt = $pdo->prepare("
            SELECT *
            FROM task_files
            WHERE id = ?
            LIMIT 1
        ");
        $stmt->execute([$fileId]);
        $file = $stmt->fetch();

        if (!$file) {
            http_response_code(404);
            echo 'Файл не найден';
            return;
        }

        $absolutePath = __DIR__ . '/../../' . $file['file_path'];

        if (!is_file($absolutePath)) {
            http_response_code(404);
            echo 'Файл не найден на диске';
            return;
        }

        header('Content-Description: File Transfer');
        header('Content-Type: ' . ($file['mime_type'] ?: 'application/octet-stream'));
        header('Content-Disposition: attachment; filename="' . basename((string)$file['original_name']) . '"');
        header('Content-Length: ' . filesize($absolutePath));
        header('Pragma: public');

        readfile($absolutePath);
        exit;
    }
    public function view(): void
    {
        if (!Auth::check()) {
            header('Location: /login');
            exit;
        }

        $fileId = (int)($_GET['id'] ?? 0);

        if ($fileId <= 0) {
            http_response_code(404);
            echo 'Файл не найден';
            return;
        }

        $pdo = DB::connection();

        $stmt = $pdo->prepare("
        SELECT *
        FROM task_files
        WHERE id = ?
        LIMIT 1
    ");
        $stmt->execute([$fileId]);
        $file = $stmt->fetch();

        if (!$file) {
            http_response_code(404);
            echo 'Файл не найден';
            return;
        }

        $absolutePath = __DIR__ . '/../../' . $file['file_path'];

        if (!is_file($absolutePath)) {
            http_response_code(404);
            echo 'Файл не найден на диске';
            return;
        }

        $mimeType = $file['mime_type'] ?: mime_content_type($absolutePath) ?: 'application/octet-stream';

        header('Content-Type: ' . $mimeType);
        header('Content-Length: ' . filesize($absolutePath));
        header('Content-Disposition: inline; filename="' . basename((string)$file['original_name']) . '"');

        readfile($absolutePath);
        exit;
    }
    public function delete(): void
    {
        if (!Auth::check()) {
            if ($this->isAjax()) {
                $this->json(['success' => false, 'message' => 'Unauthorized'], 403);
            }

            header('Location: /login');
            exit;
        }

        $fileId = (int)($_POST['id'] ?? 0);

        if ($fileId <= 0) {
            if ($this->isAjax()) {
                $this->json(['success' => false, 'message' => 'Файл не найден'], 404);
            }

            $_SESSION['error'] = 'Файл не найден';
            header('Location: /tasks');
            exit;
        }

        $pdo = DB::connection();

        $stmt = $pdo->prepare("
        SELECT *
        FROM task_files
        WHERE id = ?
        LIMIT 1
    ");
        $stmt->execute([$fileId]);
        $file = $stmt->fetch();

        if (!$file) {
            if ($this->isAjax()) {
                $this->json(['success' => false, 'message' => 'Файл не найден'], 404);
            }

            $_SESSION['error'] = 'Файл не найден';
            header('Location: /tasks');
            exit;
        }

        $absolutePath = __DIR__ . '/../../' . $file['file_path'];

        $stmt = $pdo->prepare("DELETE FROM task_files WHERE id = ?");
        $stmt->execute([$fileId]);

        if (is_file($absolutePath)) {
            @unlink($absolutePath);
        }

        if ($this->isAjax()) {
            $this->json([
                'success' => true,
                'file_id' => $fileId,
            ]);
        }

        header('Location: /tasks');
        exit;
    }
    private function isAjax(): bool
    {
        return strtolower((string)($_SERVER['HTTP_X_REQUESTED_WITH'] ?? '')) === 'xmlhttprequest';
    }

    private function json(array $data, int $statusCode = 200): void
    {
        http_response_code($statusCode);
        header('Content-Type: application/json; charset=utf-8');
        echo json_encode($data, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
        exit;
    }
}