<?php

declare(strict_types=1);

namespace App\Controllers;

use App\Repositories\ActivityRepository;
use App\Repositories\ProjectRepository;
use App\Repositories\TaskRepository;
use Core\Controller;
use Core\Validator;

class TaskController extends Controller
{
    private const TASK_STATUS_OPTIONS = ['backlog', 'in-progress', 'review', 'blocked', 'done'];
    private const PRIORITY_OPTIONS = ['low', 'normal', 'high', 'urgent'];

    public function store(string $projectId)
    {
        $this->requirePost(request());

        if (!verify_csrf_token((string) request()->input('_token'))) {
            return $this->renderProjectWithTaskErrors((int) $projectId, ['_token' => ['The security token expired. Refresh the page and try again.']], $this->taskFormFromRequest());
        }

        $projectRepository = new ProjectRepository();
        $project = $projectRepository->findBoard((int) $projectId);

        if ($project === null) {
            return \Core\Response::notFound('Project not found.');
        }

        $data = $this->taskDataFromRequest();
        $errors = $this->validateTask($data);

        if ($errors !== []) {
            return $this->renderProjectWithTaskErrors((int) $projectId, $errors, $data);
        }

        $taskId = (new TaskRepository())->create((int) $projectId, $data);
        (new ActivityRepository())->record(
            'task_created',
            'Added task ' . $data['title'],
            'Task created on the project board.',
            (int) $projectId,
            $taskId
        );

        return $this->redirect('/projects/' . (int) $projectId . '?task=created#task-' . $taskId);
    }

    public function updateStatus(string $id)
    {
        $this->requirePost(request());

        if (!verify_csrf_token((string) request()->input('_token'))) {
            return $this->redirect('/projects');
        }

        $status = trim((string) request()->input('status', ''));
        if (!in_array($status, self::TASK_STATUS_OPTIONS, true)) {
            return $this->redirect('/projects');
        }

        $projectId = (new TaskRepository())->updateStatus((int) $id, $status);

        if ($projectId === null) {
            return \Core\Response::notFound('Task not found.');
        }

        (new ActivityRepository())->record(
            'task_status_changed',
            'Task updated to ' . task_status_label($status),
            'Task status changed on the project board.',
            $projectId,
            (int) $id
        );

        return $this->redirect('/projects/' . $projectId . '?task-updated=1#task-' . (int) $id);
    }

    private function taskFormFromRequest(): array
    {
        $input = request()->all();

        return [
            'title' => (string) ($input['title'] ?? ''),
            'description' => (string) ($input['description'] ?? ''),
            'priority' => (string) ($input['priority'] ?? 'normal'),
            'status' => (string) ($input['status'] ?? 'backlog'),
            'assignee' => (string) ($input['assignee'] ?? ''),
            'estimate_hours' => (string) ($input['estimate_hours'] ?? ''),
            'due_date' => (string) ($input['due_date'] ?? ''),
        ];
    }

    private function taskDataFromRequest(): array
    {
        $input = request()->all();
        $estimateHours = trim((string) ($input['estimate_hours'] ?? ''));
        $dueDate = trim((string) ($input['due_date'] ?? ''));

        return [
            'title' => trim((string) ($input['title'] ?? '')),
            'description' => trim((string) ($input['description'] ?? '')),
            'priority' => trim((string) ($input['priority'] ?? 'normal')),
            'status' => trim((string) ($input['status'] ?? 'backlog')),
            'assignee' => trim((string) ($input['assignee'] ?? '')),
            'estimate_hours' => $estimateHours !== '' ? (float) $estimateHours : null,
            'due_date' => $dueDate !== '' ? $dueDate : null,
        ];
    }

    private function validateTask(array $data): array
    {
        $validator = new Validator();

        $validator->required('title', $data['title'], 'Task title is required.')->maxLength('title', $data['title'], 140);
        $validator->required('description', $data['description'], 'Task description is required.')->maxLength('description', $data['description'], 800);
        $validator->required('assignee', $data['assignee'], 'Assign the task to someone.')->maxLength('assignee', $data['assignee'], 100);

        if (!in_array($data['priority'], self::PRIORITY_OPTIONS, true)) {
            $validator->required('priority', null, 'Choose a valid task priority.');
        }

        if (!in_array($data['status'], self::TASK_STATUS_OPTIONS, true)) {
            $validator->required('status', null, 'Choose a valid task status.');
        }

        if ($data['due_date'] !== null && !preg_match('/^\d{4}-\d{2}-\d{2}$/', $data['due_date'])) {
            $validator->required('due_date', null, 'Use a valid due date.');
        }

        if ($data['estimate_hours'] !== null && $data['estimate_hours'] < 0) {
            $validator->required('estimate_hours', null, 'Estimate hours must be 0 or more.');
        }

        return $validator->errors();
    }

    private function renderProjectWithTaskErrors(int $projectId, array $errors, array $old)
    {
        $projectRepository = new ProjectRepository();
        $project = $projectRepository->findBoard($projectId);

        if ($project === null) {
            return \Core\Response::notFound('Project not found.');
        }

        return $this->view('projects.show', [
            'pageTitle' => $project['name'],
            'project' => $project,
            'taskStatusOptions' => self::TASK_STATUS_OPTIONS,
            'priorityOptions' => self::PRIORITY_OPTIONS,
            'activity' => (new ActivityRepository())->forProject($projectId, 12),
            'taskErrors' => $errors,
            'taskOld' => array_merge($this->taskFormFromRequest(), $old),
        ]);
    }
}