<?php

namespace App\Support\Onboarding;

final class OnboardingTaskCatalog
{
    /**
     * @return array<int, array{task_type: string, title: string, step: int, prerequisites: array<int, string>}>
     */
    public static function all(): array
    {
        return [
            [
                'task_type' => OnboardingTaskType::VerifyPermissions,
                'title' => 'Verify permissions',
                'step' => 4,
                'prerequisites' => [],
            ],
            [
                'task_type' => OnboardingTaskType::ConsentStatus,
                'title' => 'Check consent status',
                'step' => 4,
                'prerequisites' => [OnboardingTaskType::VerifyPermissions],
            ],
            [
                'task_type' => OnboardingTaskType::ConnectionDiagnostics,
                'title' => 'Run connection diagnostics',
                'step' => 4,
                'prerequisites' => [OnboardingTaskType::VerifyPermissions],
            ],
            [
                'task_type' => OnboardingTaskType::InitialSync,
                'title' => 'Initial sync',
                'step' => 5,
                'prerequisites' => [OnboardingTaskType::VerifyPermissions],
            ],
        ];
    }

    /**
     * @return array{task_type: string, title: string, step: int, prerequisites: array<int, string>}|null
     */
    public static function find(string $taskType): ?array
    {
        foreach (self::all() as $task) {
            if ($task['task_type'] === $taskType) {
                return $task;
            }
        }

        return null;
    }

    /**
     * @param  array<string, string>  $latestEvidenceStatusByTaskType
     */
    public static function prerequisitesMet(string $taskType, array $latestEvidenceStatusByTaskType): bool
    {
        return count(self::unmetPrerequisites($taskType, $latestEvidenceStatusByTaskType)) === 0;
    }

    /**
     * @param  array<string, string>  $latestEvidenceStatusByTaskType
     * @return array<int, string>
     */
    public static function unmetPrerequisites(string $taskType, array $latestEvidenceStatusByTaskType): array
    {
        $task = self::find($taskType);

        if (! $task) {
            return [];
        }

        $unmet = [];

        foreach ($task['prerequisites'] as $requiredTaskType) {
            $status = $latestEvidenceStatusByTaskType[$requiredTaskType] ?? 'unknown';

            if ($status !== 'ok') {
                $unmet[] = $requiredTaskType;
            }
        }

        return $unmet;
    }
}