<?php

declare(strict_types=1);

namespace App\Controllers;

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

class ProjectController extends Controller
{
    private const STATUS_OPTIONS = ['planned', 'active', 'at-risk', 'paused', 'done'];
    private const TASK_STATUS_OPTIONS = ['backlog', 'in-progress', 'review', 'blocked', 'done'];
    private const PRIORITY_OPTIONS = ['low', 'normal', 'high', 'urgent'];

    public function index()
    {
        $search = trim((string) request()->input('search', ''));
        $status = trim((string) request()->input('status', ''));

        $repository = new ProjectRepository();

        return $this->view('projects.index', [
            'pageTitle' => 'Projects',
            'projects' => $repository->all($search, $status),
            'summary' => $repository->dashboardSummary(),
            'search' => $search,
            'status' => $status,
            'statusOptions' => self::STATUS_OPTIONS,
        ]);
    }

    public function create()
    {
        return $this->view('projects.create', [
            'pageTitle' => 'Create project',
            'statusOptions' => self::STATUS_OPTIONS,
            'old' => $this->defaultProjectForm(),
            'errors' => [],
        ]);
    }

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

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

        $data = $this->projectDataFromRequest();
        $errors = $this->validateProject($data);

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

        $projectId = (new ProjectRepository())->create($data);

        return $this->redirect('/projects/' . $projectId);
    }

    public function show(string $id)
    {
        $projectId = (int) $id;
        $repository = new ProjectRepository();
        $project = $repository->findBoard($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' => [],
            'taskOld' => $this->defaultTaskForm(),
        ]);
    }

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

        if (!verify_csrf_token((string) request()->input('_token'))) {
            return $this->redirect('/projects/' . (int) $id . '?error=token');
        }

        $status = trim((string) request()->input('status', ''));

        if (!in_array($status, self::STATUS_OPTIONS, true)) {
            return $this->redirect('/projects/' . (int) $id . '?error=status');
        }

        (new ProjectRepository())->updateStatus((int) $id, $status);

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

    private function renderCreateWithErrors(array $errors, array $old)
    {
        return $this->view('projects.create', [
            'pageTitle' => 'Create project',
            'statusOptions' => self::STATUS_OPTIONS,
            'errors' => $errors,
            'old' => array_merge($this->defaultProjectForm(), $old),
        ]);
    }

    private function defaultProjectForm(array $input = []): array
    {
        return [
            'name' => (string) ($input['name'] ?? ''),
            'code' => (string) ($input['code'] ?? ''),
            'client_name' => (string) ($input['client_name'] ?? ''),
            'description' => (string) ($input['description'] ?? ''),
            'status' => (string) ($input['status'] ?? 'planned'),
            'start_date' => (string) ($input['start_date'] ?? date('Y-m-d')),
            'due_date' => (string) ($input['due_date'] ?? ''),
            'budget_cents' => (string) ($input['budget_cents'] ?? '0'),
            'owner_name' => (string) ($input['owner_name'] ?? ''),
            'color_token' => (string) ($input['color_token'] ?? 'teal'),
            'members_text' => (string) ($input['members_text'] ?? ''),
        ];
    }

    private function defaultTaskForm(array $input = []): array
    {
        return [
            'title' => (string) ($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 projectDataFromRequest(): array
    {
        $input = request()->all();

        return [
            'name' => trim((string) ($input['name'] ?? '')),
            'code' => trim((string) ($input['code'] ?? '')),
            'client_name' => trim((string) ($input['client_name'] ?? '')),
            'description' => trim((string) ($input['description'] ?? '')),
            'status' => trim((string) ($input['status'] ?? 'planned')),
            'start_date' => trim((string) ($input['start_date'] ?? '')),
            'due_date' => trim((string) ($input['due_date'] ?? '')),
            'budget_cents' => max(0, (int) preg_replace('/[^0-9]/', '', (string) ($input['budget_cents'] ?? '0'))),
            'owner_name' => trim((string) ($input['owner_name'] ?? '')),
            'color_token' => trim((string) ($input['color_token'] ?? 'teal')),
            'members' => $this->parseMembers((string) ($input['members_text'] ?? '')),
            'members_text' => (string) ($input['members_text'] ?? ''),
        ];
    }

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

        $validator->required('name', $data['name'], 'Project name is required.')->maxLength('name', $data['name'], 120);
        $validator->required('client_name', $data['client_name'], 'Client name is required.')->maxLength('client_name', $data['client_name'], 120);
        $validator->required('owner_name', $data['owner_name'], 'Project owner is required.')->maxLength('owner_name', $data['owner_name'], 120);
        $validator->required('description', $data['description'], 'Project summary is required.')->maxLength('description', $data['description'], 800);
        $validator->required('status', $data['status'], 'Choose a project status.');
        $validator->required('start_date', $data['start_date'], 'Start date is required.');

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

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

        return $validator->errors();
    }

    private function parseMembers(string $value): array
    {
        $lines = preg_split('/[\r\n,]+/', $value) ?: [];
        $members = [];

        foreach ($lines as $index => $line) {
            $name = trim($line);
            if ($name === '') {
                continue;
            }

            $members[] = [
                'full_name' => $name,
                'role' => $index === 0 ? 'Project Lead' : 'Contributor',
                'allocation_percent' => $index === 0 ? 40 : 20,
            ];
        }

        return $members;
    }
}