<?php

declare(strict_types=1);

namespace App\Filament\Pages\Onboarding;

use App\Jobs\Onboarding\OnboardingConnectionDiagnosticsJob;
use App\Jobs\Onboarding\OnboardingConsentStatusJob;
use App\Jobs\Onboarding\OnboardingInitialSyncJob;
use App\Jobs\Onboarding\OnboardingVerifyPermissionsJob;
use App\Models\OnboardingEvidence;
use App\Models\OnboardingSession;
use App\Models\ProviderConnection;
use App\Models\Tenant;
use App\Models\User;
use App\Services\Auth\CapabilityResolver;
use App\Services\OperationRunService;
use App\Support\Auth\Capabilities;
use App\Support\Badges\BadgeCatalog;
use App\Support\Badges\BadgeDomain;
use App\Support\Onboarding\OnboardingFixHints;
use App\Support\Onboarding\OnboardingTaskCatalog;
use App\Support\Onboarding\OnboardingTaskType;
use App\Support\OperationRunLinks;
use Filament\Notifications\Notification;
use Filament\Pages\Page;

class TenantOnboardingTaskBoard extends Page
{
    protected static bool $shouldRegisterNavigation = false;

    protected static ?string $slug = 'onboarding/tasks';

    protected static ?string $title = 'Onboarding task board';

    protected string $view = 'filament.pages.onboarding.tenant-onboarding-task-board';

    public ?OnboardingSession $session = null;

    public bool $canStartProviderTasks = false;

    /**
     * @var array<string, string>
     */
    public array $runUrls = [];

    public function mount(): void
    {
        $tenant = Tenant::current();

        $user = auth()->user();
        if (! $user instanceof User) {
            abort(403, 'Not allowed');
        }

        /** @var CapabilityResolver $resolver */
        $resolver = app(CapabilityResolver::class);
        $this->canStartProviderTasks = $resolver->can($user, $tenant, Capabilities::PROVIDER_RUN);

        $activeSession = OnboardingSession::query()
            ->where('tenant_id', $tenant->getKey())
            ->whereIn('status', ['draft', 'in_progress'])
            ->latest('id')
            ->first();

        if (! $activeSession instanceof OnboardingSession) {
            $this->redirect(TenantOnboardingWizard::getUrl(tenant: $tenant));

            return;
        }

        $this->session = $activeSession;

        if ($activeSession->current_step < 4) {
            $this->redirect(TenantOnboardingWizard::getUrl(tenant: $tenant));
        }
    }

    /**
     * @return array<string, string>
     */
    public function latestEvidenceStatusByTaskType(): array
    {
        $tenant = Tenant::current();

        $evidence = OnboardingEvidence::query()
            ->where('tenant_id', $tenant->getKey())
            ->whereIn('task_type', OnboardingTaskType::all())
            ->orderByDesc('recorded_at')
            ->get();

        $byTask = [];

        foreach ($evidence as $row) {
            if (! isset($byTask[$row->task_type])) {
                $byTask[$row->task_type] = $row->status;
            }
        }

        return $byTask;
    }

    /**
     * @return array<string, OnboardingEvidence>
     */
    public function latestEvidenceByTaskType(): array
    {
        $tenant = Tenant::current();

        $evidence = OnboardingEvidence::query()
            ->where('tenant_id', $tenant->getKey())
            ->whereIn('task_type', OnboardingTaskType::all())
            ->orderByDesc('recorded_at')
            ->get();

        $byTask = [];

        foreach ($evidence as $row) {
            if (! isset($byTask[$row->task_type])) {
                $byTask[$row->task_type] = $row;
            }
        }

        return $byTask;
    }

    /**
     * @return array<int, array{
     *   task_type: string,
     *   title: string,
     *   step: int,
     *   prerequisites: array<int, string>,
     *   status: string,
     *   badge: \App\Support\Badges\BadgeSpec,
     *   evidence: OnboardingEvidence|null,
     *   prerequisites_met: bool,
     *   unmet_prerequisites: array<int, string>,
     * }>
     */
    public function taskRows(): array
    {
        $statuses = $this->latestEvidenceStatusByTaskType();
        $evidenceByTask = $this->latestEvidenceByTaskType();

        return collect(OnboardingTaskCatalog::all())
            ->map(function (array $task) use ($statuses, $evidenceByTask): array {
                $taskType = $task['task_type'];
                $status = $statuses[$taskType] ?? 'unknown';

                $unmet = OnboardingTaskCatalog::unmetPrerequisites($taskType, $statuses);

                return [
                    'task_type' => $taskType,
                    'title' => $task['title'],
                    'step' => $task['step'],
                    'prerequisites' => $task['prerequisites'],
                    'status' => $status,
                    'badge' => BadgeCatalog::spec(BadgeDomain::OnboardingTaskStatus, $status),
                    'evidence' => $evidenceByTask[$taskType] ?? null,
                    'prerequisites_met' => count($unmet) === 0,
                    'unmet_prerequisites' => $unmet,
                ];
            })
            ->values()
            ->all();
    }

    /**
     * @return array<int, string>
     */
    public function fixHintsFor(?string $reasonCode): array
    {
        return OnboardingFixHints::forReason($reasonCode);
    }

    /**
     * @return array<int, array{
     *   recorded_at: string,
     *   task_type: string,
     *   status: string,
     *   badge: \App\Support\Badges\BadgeSpec,
     *   reason_code: string|null,
     *   message: string|null,
     *   run_url: string|null,
     * }>
     */
    public function recentEvidenceRows(int $limit = 20): array
    {
        $tenant = Tenant::current();

        $evidence = OnboardingEvidence::query()
            ->where('tenant_id', $tenant->getKey())
            ->orderByDesc('recorded_at')
            ->limit($limit)
            ->with('operationRun')
            ->get();

        return $evidence
            ->map(function (OnboardingEvidence $row) use ($tenant): array {
                $runUrl = null;

                if ($row->operationRun) {
                    $runUrl = OperationRunLinks::view($row->operationRun, $tenant);
                }

                return [
                    'recorded_at' => $row->recorded_at?->toDateTimeString() ?? '',
                    'task_type' => $row->task_type,
                    'status' => $row->status,
                    'badge' => BadgeCatalog::spec(BadgeDomain::OnboardingTaskStatus, $row->status),
                    'reason_code' => $row->reason_code,
                    'message' => $row->message,
                    'run_url' => $runUrl,
                ];
            })
            ->values()
            ->all();
    }

    public function startTask(string $taskType): void
    {
        if (! $this->canStartProviderTasks) {
            abort(403);
        }

        $tenant = Tenant::current();
        $user = auth()->user();

        if (! $user instanceof User) {
            abort(403, 'Not allowed');
        }

        if (! $this->session instanceof OnboardingSession) {
            Notification::make()
                ->title('No onboarding session')
                ->danger()
                ->send();

            return;
        }

        if ($this->session->current_step < 4) {
            $this->redirect(TenantOnboardingWizard::getUrl(tenant: $tenant));

            return;
        }

        if (! in_array($taskType, OnboardingTaskType::all(), true)) {
            Notification::make()
                ->title('Unknown task')
                ->danger()
                ->send();

            return;
        }

        $latestStatuses = $this->latestEvidenceStatusByTaskType();

        if (! OnboardingTaskCatalog::prerequisitesMet($taskType, $latestStatuses)) {
            Notification::make()
                ->title('Prerequisites not met')
                ->body('Complete required tasks first.')
                ->warning()
                ->send();

            return;
        }

        $connectionId = $this->session->provider_connection_id;

        if (! is_int($connectionId)) {
            Notification::make()
                ->title('Select a provider connection first')
                ->warning()
                ->send();

            return;
        }

        $connection = ProviderConnection::query()
            ->where('tenant_id', $tenant->getKey())
            ->whereKey($connectionId)
            ->first();

        if (! $connection instanceof ProviderConnection) {
            Notification::make()
                ->title('Selected provider connection not found')
                ->danger()
                ->send();

            return;
        }

        /** @var OperationRunService $runs */
        $runs = app(OperationRunService::class);

        $run = $runs->ensureRunWithIdentity(
            tenant: $tenant,
            type: $taskType,
            identityInputs: ['task_type' => $taskType],
            context: [
                'task_type' => $taskType,
                'onboarding_session_id' => (int) $this->session->getKey(),
                'provider_connection_id' => (int) $connection->getKey(),
            ],
            initiator: $user,
        );

        $this->runUrls[$taskType] = OperationRunLinks::view($run, $tenant);

        if (! $run->wasRecentlyCreated) {
            Notification::make()
                ->title('Task already queued')
                ->body('A run is already queued or running. Use the link to monitor progress.')
                ->warning()
                ->send();

            return;
        }

        match ($taskType) {
            OnboardingTaskType::VerifyPermissions => OnboardingVerifyPermissionsJob::dispatch(
                tenantId: (int) $tenant->getKey(),
                userId: (int) $user->getKey(),
                providerConnectionId: (int) $connection->getKey(),
                onboardingSessionId: (int) $this->session->getKey(),
                operationRun: $run,
            ),
            OnboardingTaskType::ConsentStatus => OnboardingConsentStatusJob::dispatch(
                tenantId: (int) $tenant->getKey(),
                userId: (int) $user->getKey(),
                providerConnectionId: (int) $connection->getKey(),
                onboardingSessionId: (int) $this->session->getKey(),
                operationRun: $run,
            ),
            OnboardingTaskType::ConnectionDiagnostics => OnboardingConnectionDiagnosticsJob::dispatch(
                tenantId: (int) $tenant->getKey(),
                userId: (int) $user->getKey(),
                providerConnectionId: (int) $connection->getKey(),
                onboardingSessionId: (int) $this->session->getKey(),
                operationRun: $run,
            ),
            OnboardingTaskType::InitialSync => OnboardingInitialSyncJob::dispatch(
                tenantId: (int) $tenant->getKey(),
                userId: (int) $user->getKey(),
                providerConnectionId: (int) $connection->getKey(),
                onboardingSessionId: (int) $this->session->getKey(),
                operationRun: $run,
            ),
            default => null,
        };

        Notification::make()
            ->title('Task queued')
            ->success()
            ->send();
    }
}