<?php

namespace App\Support\MedicalReport;

use App\Models\HospitalUnit;
use Illuminate\Support\Facades\File;
use Illuminate\Support\Str;

class DepartmentCatalog
{
    /**
     * @var list<array<string, mixed>>|null
     */
    private ?array $departments = null;

    /**
     * @return list<array<string, mixed>>
     */
    public function departments(): array
    {
        if ($this->departments !== null) {
            return $this->departments;
        }

        $directory = config('medical-report.source_directory');

        if (! is_string($directory) || $directory === '' || ! is_dir($directory)) {
            return $this->departments = [];
        }

        /** @var array<string, list<array{name: string, path: string, extension: string, canonical_name: string}>> $sourcesByCanonicalName */
        $sourcesByCanonicalName = [];

        foreach (File::files($directory) as $file) {
            $sourceName = $file->getFilenameWithoutExtension();
            $canonicalName = $this->canonicalName($sourceName);
            $sourcesByCanonicalName[$canonicalName] ??= [];
            $sourcesByCanonicalName[$canonicalName][] = [
                'name' => $file->getFilename(),
                'path' => $file->getPathname(),
                'extension' => strtolower($file->getExtension()),
                'canonical_name' => $canonicalName,
            ];
        }

        $reportingUnitSources = config('medical-report.reporting_unit_sources', []);
        $departments = [];

        $databaseReportingUnits = HospitalUnit::query()
            ->with('profile:id,name,sort_order')
            ->where('is_reporting_unit', true)
            ->where('is_active', true)
            ->get()
            ->sortBy([
                fn (HospitalUnit $unit): int => $unit->profile?->sort_order ?? PHP_INT_MAX,
                fn (HospitalUnit $unit): string => $unit->name,
            ])
            ->values();
        $profileNamesByUnit = collect(config('medical-report.finance_profiles', []))
            ->flatMap(function (array $profile): array {
                return collect($profile['units'] ?? [])
                    ->filter(fn (mixed $unit): bool => is_string($unit) && trim($unit) !== '')
                    ->mapWithKeys(fn (string $unit): array => [$unit => $profile['name']])
                    ->all();
            })
            ->all();

        if ($databaseReportingUnits->isNotEmpty()) {
            foreach ($databaseReportingUnits as $unit) {
                $mappedSourceNames = $reportingUnitSources[$unit->name] ?? [$unit->name];
                $sources = collect($mappedSourceNames)
                    ->filter(fn (mixed $sourceName): bool => is_string($sourceName) && trim($sourceName) !== '')
                    ->flatMap(fn (string $sourceName): array => $sourcesByCanonicalName[$sourceName] ?? [])
                    ->sortBy(fn (array $source): int => match ($source['extension']) {
                        'xlsx' => 0,
                        'pdf' => 1,
                        default => 2,
                    })
                    ->values()
                    ->all();

                if ($sources === []) {
                    continue;
                }

                $departments[] = [
                    'id' => $unit->id,
                    'key' => $unit->slug,
                    'name' => $unit->name,
                    'profile_name' => $unit->profile?->name,
                    'report_input_type' => $unit->report_input_type,
                    'report_input_type_label' => $this->reportInputTypeLabel($unit->report_input_type),
                    'template_name' => $sources[0]['canonical_name'] ?? $unit->name,
                    'sources' => array_map(fn (array $source): array => [
                        'name' => $source['name'],
                        'path' => $source['path'],
                        'extension' => $source['extension'],
                    ], $sources),
                ];
            }

            return $this->departments = $departments;
        }

        foreach (config('medical-report.reporting_units', []) as $unitName) {
            if (! is_string($unitName) || trim($unitName) === '') {
                continue;
            }

            $mappedSourceNames = $reportingUnitSources[$unitName] ?? [$unitName];
            $sources = collect($mappedSourceNames)
                ->filter(fn (mixed $sourceName): bool => is_string($sourceName) && trim($sourceName) !== '')
                ->flatMap(fn (string $sourceName): array => $sourcesByCanonicalName[$sourceName] ?? [])
                ->sortBy(fn (array $source): int => match ($source['extension']) {
                    'xlsx' => 0,
                    'pdf' => 1,
                    default => 2,
                })
                ->values()
                ->all();

            if ($sources === []) {
                continue;
            }

            $departments[] = [
                'key' => Str::slug(Str::ascii($unitName)),
                'name' => $unitName,
                'profile_name' => $profileNamesByUnit[$unitName] ?? null,
                'report_input_type' => config('medical-report.reporting_unit_input_types.'.$unitName),
                'report_input_type_label' => $this->reportInputTypeLabel(
                    config('medical-report.reporting_unit_input_types.'.$unitName)
                ),
                'template_name' => $sources[0]['canonical_name'] ?? $unitName,
                'sources' => array_map(fn (array $source): array => [
                    'name' => $source['name'],
                    'path' => $source['path'],
                    'extension' => $source['extension'],
                ], $sources),
            ];
        }

        return $this->departments = $departments;
    }

    public function canonicalName(string $sourceName): string
    {
        $aliases = config('medical-report.aliases', []);

        if (is_array($aliases) && isset($aliases[$sourceName]) && is_string($aliases[$sourceName])) {
            return $aliases[$sourceName];
        }

        return Str::of($sourceName)
            ->replaceMatches('/\s+/', ' ')
            ->trim()
            ->toString();
    }

    private function reportInputTypeLabel(?string $reportInputType): ?string
    {
        if ($reportInputType === null || $reportInputType === '') {
            return null;
        }

        $label = config('medical-report.report_input_type_labels.'.$reportInputType);

        return is_string($label) && $label !== ''
            ? $label
            : $reportInputType;
    }
}