<?php

namespace Modules\IntegrationHub\Services;

use Carbon\Carbon;
use Illuminate\Support\Facades\Storage;
use Modules\IntegrationHub\Events\ExecutiveCockpitExported;
use Modules\IntegrationHub\Events\IntegrationExportCompleted;
use Modules\IntegrationHub\Models\IhExportJob;

class ExecutiveCockpitExportService
{
    public function __construct(
        protected ODataExportService $odataExportService
    ) {}

    public function export(int $businessId, string $format = 'json', ?Carbon $startDate = null, ?Carbon $endDate = null): IhExportJob
    {
        $startDate = $startDate ?? now()->startOfMonth();
        $endDate = $endDate ?? now();

        $job = IhExportJob::create([
            'business_id' => $businessId,
            'dataset' => 'executive_cockpit',
            'format' => $format,
            'status' => 'processing',
        ]);

        try {
            $payload = $this->buildPayload($businessId, $startDate, $endDate);
            $filePath = $this->writeExportFile($businessId, $job->id, $format, $payload);
            $job->markCompleted($filePath);

            ExecutiveCockpitExported::dispatch($businessId, $payload, $job->id);
            IntegrationExportCompleted::dispatch($businessId, 'executive_cockpit', $format, $filePath, $job->id);

            return $job->fresh();
        } catch (\Throwable $e) {
            $job->markFailed();
            throw $e;
        }
    }

    public function buildPayload(int $businessId, Carbon $startDate, Carbon $endDate): array
    {
        if (class_exists(\Modules\ManagementTools\Services\ExecutiveCockpitService::class)
            && \Module::has('ManagementTools')
            && \Module::isEnabled('ManagementTools')) {
            $cockpit = app(\Modules\ManagementTools\Services\ExecutiveCockpitService::class);

            return $cockpit->build($businessId, $startDate, $endDate);
        }

        $filters = [
            'start_date' => $startDate->toDateString(),
            'end_date' => $endDate->toDateString(),
        ];

        return [
            'range' => ['start' => $startDate, 'end' => $endDate],
            'sales_summary' => $this->odataExportService->dataset($businessId, 'sales_summary', $filters),
            'inventory_snapshot' => $this->odataExportService->dataset($businessId, 'inventory_snapshot', $filters),
            'production_kpis' => $this->odataExportService->dataset($businessId, 'production_kpis', $filters),
            'maintenance_kpis' => $this->odataExportService->dataset($businessId, 'maintenance_kpis', $filters),
            'qms_kpis' => $this->odataExportService->dataset($businessId, 'qms_kpis', $filters),
            'exported_at' => now()->toIso8601String(),
        ];
    }

    protected function writeExportFile(int $businessId, int $jobId, string $format, array $payload): string
    {
        $directory = "integrationhub/exports/{$businessId}";
        $filename = "executive_cockpit_{$jobId}_".now()->format('Ymd_His');

        if ($format === 'json') {
            $path = "{$directory}/{$filename}.json";
            Storage::disk('local')->put($path, json_encode($payload, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE));

            return $path;
        }

        if ($format === 'csv') {
            $path = "{$directory}/{$filename}.csv";
            $rows = $this->flattenForCsv($payload);
            $handle = fopen('php://temp', 'r+');
            if (! empty($rows)) {
                fputcsv($handle, array_keys($rows[0]));
                foreach ($rows as $row) {
                    fputcsv($handle, $row);
                }
            }
            rewind($handle);
            Storage::disk('local')->put($path, stream_get_contents($handle));
            fclose($handle);

            return $path;
        }

        $path = "{$directory}/{$filename}.json";
        Storage::disk('local')->put($path, json_encode($payload, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE));

        return $path;
    }

    protected function flattenForCsv(array $payload): array
    {
        $rows = [];

        foreach (['sales_summary', 'inventory_snapshot'] as $key) {
            if (! isset($payload[$key]['value']) || ! is_array($payload[$key]['value'])) {
                continue;
            }

            foreach ($payload[$key]['value'] as $item) {
                $rows[] = array_merge(['section' => $key], (array) $item);
            }
        }

        return $rows;
    }
}