<?php

namespace App\Console\Commands;

use App\Models\User;
use Illuminate\Console\Command;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Storage;

/**
 * One-time importer: copy legacy menu/shop storefronts (and their products,
 * which live inline in qr_codes.payload.content.sections) from the shared
 * platform database (ladilldb, the `platform` connection) into this app's
 * own database, so owners who created them before the Merchant extraction
 * can see and manage them again.
 *
 * Owners are matched to local users by their platform public_id (the OIDC
 * `sub` used at SSO login); a local user stub is created when missing.
 * Product images are copied from the `platform_qr` disk to the local `qr`
 * disk (set PLATFORM_QR_ROOT to the monolith's storage/app/private/qr).
 *
 * Idempotent: existing local codes (matched by short_code) are skipped
 * unless --refresh is given.
 */
class ImportLegacyStorefronts extends Command
{
    protected $signature = 'storefronts:import-legacy
        {--user= : Only import for this owner (platform public_id or email)}
        {--refresh : Overwrite local codes that already exist (matched by short_code)}
        {--skip-images : Do not copy image files, only the database rows}
        {--deactivate-source : After a successful import, mark the platform copy inactive so Merchant is the single source of truth (public scans still forward here via type)}
        {--dry-run : Report what would happen without writing anything}';

    protected $description = 'Import legacy menu/shop storefronts and their products from the platform database.';

    /** Storefront QR types that hold products in their payload. */
    private array $types = ['shop', 'menu'];

    public function handle(): int
    {
        $dry = (bool) $this->option('dry-run');
        $refresh = (bool) $this->option('refresh');
        $skipImages = (bool) $this->option('skip-images');
        $deactivateSource = (bool) $this->option('deactivate-source');

        $platform = DB::connection('platform');

        $query = $platform->table('qr_codes')->whereIn('type', $this->types);

        if ($owner = $this->option('user')) {
            $platformOwner = $platform->table('users')
                ->where('public_id', $owner)
                ->orWhere('email', $owner)
                ->first();

            if (! $platformOwner) {
                $this->error("No platform user matches '{$owner}'.");

                return self::FAILURE;
            }

            $query->where('user_id', $platformOwner->id);
        }

        $rows = $query->orderBy('id')->get();
        $this->info("Found {$rows->count()} legacy storefront code(s) on the platform.");

        if ($rows->isEmpty()) {
            return self::SUCCESS;
        }

        $platformUsers = $platform->table('users')
            ->whereIn('id', $rows->pluck('user_id')->unique()->all())
            ->get()
            ->keyBy('id');

        $imported = 0;
        $skipped = 0;
        $usersCreated = 0;
        $imagesCopied = 0;
        $deactivated = 0;
        $failed = 0;

        foreach ($rows as $row) {
            $platformUser = $platformUsers->get($row->user_id);

            if (! $platformUser) {
                $this->warn("  {$row->short_code}: platform owner #{$row->user_id} not found — skipped.");
                $failed++;

                continue;
            }

            $localUser = User::query()
                ->when($platformUser->public_id, fn ($q) => $q->where('public_id', $platformUser->public_id))
                ->when(! $platformUser->public_id, fn ($q) => $q->where('email', $platformUser->email))
                ->first();

            if (! $localUser && $platformUser->public_id) {
                $localUser = User::where('email', $platformUser->email)->first();
            }

            if (! $localUser) {
                if (! $platformUser->public_id) {
                    $this->warn("  {$row->short_code}: owner has no public_id and no local match — skipped.");
                    $failed++;

                    continue;
                }

                if ($dry) {
                    $this->line("  would create local user {$platformUser->email}");
                } else {
                    $localUser = User::create([
                        'public_id' => $platformUser->public_id,
                        'name' => $platformUser->name,
                        'email' => $platformUser->email ?: $platformUser->public_id.'@users.ladill.com',
                        'avatar_url' => $platformUser->avatar_url ?? null,
                    ]);
                }

                $usersCreated++;
            }

            $existing = DB::table('qr_codes')->where('short_code', $row->short_code)->first();

            if ($existing && ! $refresh) {
                $skipped++;

                if ($deactivateSource && ! $dry && $row->is_active) {
                    $platform->table('qr_codes')->where('id', $row->id)->update(['is_active' => 0]);
                    $deactivated++;
                    $this->line("  {$row->short_code}: already exists — skipped (platform copy deactivated).");
                } else {
                    $this->line("  {$row->short_code}: already exists — skipped.");
                }

                continue;
            }

            if ($dry) {
                $this->line("  would import {$row->short_code} ({$row->type}) for {$platformUser->email}");
                $imported++;

                continue;
            }

            $attrs = [
                'user_id' => $localUser->id,
                'short_code' => $row->short_code,
                'type' => $row->type,
                'label' => $row->label,
                'destination_url' => $row->destination_url,
                'qr_document_id' => null,
                'payload' => $row->payload,
                'is_active' => $row->is_active,
                'png_path' => $row->png_path,
                'svg_path' => $row->svg_path,
                'scans_total' => $row->scans_total ?? 0,
                'unique_scans_total' => $row->unique_scans_total ?? 0,
                'last_scanned_at' => $row->last_scanned_at,
                'destination_updated_at' => $row->destination_updated_at,
                'created_at' => $row->created_at,
                'updated_at' => $row->updated_at,
            ];

            if ($existing) {
                DB::table('qr_codes')->where('id', $existing->id)->update($attrs);
            } else {
                DB::table('qr_codes')->insert($attrs);
            }

            $imported++;

            if (! $skipImages) {
                $imagesCopied += $this->copyImages($row->png_path, $row->svg_path, $row->payload);
            }

            if ($deactivateSource && $row->is_active) {
                $platform->table('qr_codes')->where('id', $row->id)->update(['is_active' => 0]);
                $deactivated++;
            }
        }

        $this->newLine();
        $this->info("Imported: {$imported} · Skipped: {$skipped} · Local users created: {$usersCreated} · Images copied: {$imagesCopied} · Source deactivated: {$deactivated} · Failed: {$failed}");

        if ($dry) {
            $this->comment('Dry run — no changes were written.');
        }

        return self::SUCCESS;
    }

    /**
     * Copy a code's image files (QR PNG/SVG + every *_path / image_path in the
     * payload, e.g. logo_path, cover_path, sections[][items][].image_path) from
     * the platform QR storage to the local QR disk. Best-effort.
     */
    private function copyImages(?string $png, ?string $svg, ?string $payloadJson): int
    {
        $paths = [$png, $svg];
        $this->collectPaths(json_decode((string) $payloadJson, true) ?: [], $paths);
        $paths = array_values(array_unique(array_filter($paths, fn ($p) => is_string($p) && $p !== '')));

        $src = Storage::disk('platform_qr');
        $dst = Storage::disk('qr');
        $copied = 0;

        foreach ($paths as $path) {
            if ($dst->exists($path)) {
                continue;
            }

            if (! $src->exists($path)) {
                $this->warn("    image missing on source: {$path}");

                continue;
            }

            $dst->put($path, $src->get($path));
            $copied++;
        }

        return $copied;
    }

    /**
     * @param  array<mixed>  $data
     * @param  array<int, mixed>  $paths
     */
    private function collectPaths(array $data, array &$paths): void
    {
        foreach ($data as $key => $value) {
            if (is_array($value)) {
                $this->collectPaths($value, $paths);

                continue;
            }

            if (is_string($value) && $value !== '' && is_string($key)
                && (str_ends_with($key, '_path') || $key === 'path')) {
                $paths[] = $value;
            }
        }
    }
}