<?php

namespace App\Console\Commands;

use App\Models\CustomerHostingOrder;
use App\Models\HostingAccount;
use App\Models\HostingAccountMember;
use App\Models\HostingBillingInvoice;
use App\Models\HostingNode;
use App\Models\HostingOrder;
use App\Models\HostingPlanChange;
use App\Models\HostingProduct;
use App\Models\User;
use Illuminate\Console\Command;
use Illuminate\Support\Facades\DB;

/**
 * Zero-loss import of hosting data exported from the platform (`hosting:export`).
 * Dry-run by default; pass --commit to write.
 */
class ImportHostingCommand extends Command
{
    protected $signature = 'hosting:import
        {file : Path to hosting-export.json from the platform}
        {--commit : Actually write changes}';

    protected $description = 'Import hosting accounts and orders from the platform export';

    /** @var array<int,int> platform user_id → local user id */
    private array $userMap = [];

    /** @var array<int,int> platform account id → local account id */
    private array $accountMap = [];

    /** @var array<int,int> platform node id → local node id */
    private array $nodeMap = [];

    public function handle(): int
    {
        $commit = (bool) $this->option('commit');

        if (! $commit) {
            $this->warn('DRY RUN — no changes will be written. Re-run with --commit to apply.');
        }

        $path = $this->argument('file');
        if (! is_file($path)) {
            $this->error("File not found: {$path}");

            return self::FAILURE;
        }

        $payload = json_decode((string) file_get_contents($path), true);
        if (! is_array($payload)) {
            $this->error('Invalid JSON export file.');

            return self::FAILURE;
        }

        $apply = function (callable $callback) use ($commit): void {
            if ($commit) {
                DB::transaction($callback);
            } else {
                $callback();
            }
        };

        $apply(function () use ($payload, $commit): void {
            foreach ($payload['hosting_nodes'] ?? [] as $row) {
                $this->importNode($row, $commit);
            }
            foreach ($payload['hosting_accounts'] ?? [] as $row) {
                $this->importAccount($row, $commit);
            }
            foreach ($payload['customer_hosting_orders'] ?? [] as $row) {
                $this->importCustomerOrder($row, $commit);
            }
            foreach ($payload['hosting_orders'] ?? [] as $row) {
                $this->importLegacyOrder($row, $commit);
            }
            foreach ($payload['hosting_account_members'] ?? [] as $row) {
                $this->importMember($row, $commit);
            }
            foreach ($payload['hosting_billing_invoices'] ?? [] as $row) {
                $this->importInvoice($row, $commit);
            }
            foreach ($payload['hosting_plan_changes'] ?? [] as $row) {
                $this->importPlanChange($row, $commit);
            }
        });

        $this->info(($commit ? 'Imported' : 'Would import').' '.count($this->accountMap).' hosting account(s).');

        return self::SUCCESS;
    }

    /** @param  array<string, mixed>  $row */
    private function importNode(array $row, bool $commit): void
    {
        $platformId = (int) ($row['id'] ?? 0);
        unset($row['id'], $row['primary_hosting_node_id']);

        if ($commit) {
            $node = HostingNode::updateOrCreate(['hostname' => $row['hostname']], $row);
            $this->nodeMap[$platformId] = $node->id;
        } else {
            $this->nodeMap[$platformId] = $platformId;
            $this->line("  node {$platformId} → {$row['hostname']}");
        }
    }

    /** @param  array<string, mixed>  $row */
    private function importAccount(array $row, bool $commit): void
    {
        $platformId = (int) ($row['id'] ?? 0);
        $owner = $this->resolveUser(
            (string) ($row['owner_public_id'] ?? ''),
            (string) ($row['owner_email'] ?? ''),
        );
        if (! $owner) {
            $this->warn("Skipping account #{$platformId}: no owner public_id");

            return;
        }

        unset($row['id'], $row['owner_public_id'], $row['owner_email']);
        $row['user_id'] = $owner->id;
        $row['platform_id'] = $platformId;
        $this->mapProductId($row);

        $platformNodeId = (int) ($row['hosting_node_id'] ?? 0);
        if ($platformNodeId && isset($this->nodeMap[$platformNodeId])) {
            $row['hosting_node_id'] = $this->nodeMap[$platformNodeId];
        }

        if ($commit) {
            $account = HostingAccount::updateOrCreate(['platform_id' => $platformId], $row);
            $this->accountMap[$platformId] = $account->id;
        } else {
            $this->accountMap[$platformId] = $platformId;
            $this->line("  account {$platformId} → user {$owner->email}");
        }
    }

    /** @param  array<string, mixed>  $row */
    private function importCustomerOrder(array $row, bool $commit): void
    {
        $platformId = (int) ($row['id'] ?? 0);
        $owner = $this->resolveUser((string) ($row['owner_public_id'] ?? ''));
        if (! $owner) {
            return;
        }

        unset($row['id'], $row['owner_public_id'], $row['owner_email']);
        $row['user_id'] = $owner->id;
        $row['platform_id'] = $platformId;
        $this->mapProductId($row);

        if ($commit) {
            CustomerHostingOrder::updateOrCreate(['platform_id' => $platformId], $row);
        }
    }

    /** @param  array<string, mixed>  $row */
    private function importLegacyOrder(array $row, bool $commit): void
    {
        $platformId = (int) ($row['id'] ?? 0);
        $owner = $this->resolveUser((string) ($row['owner_public_id'] ?? ''));
        if (! $owner) {
            return;
        }

        unset($row['id'], $row['owner_public_id'], $row['owner_email']);
        $row['user_id'] = $owner->id;
        $row['platform_id'] = $platformId;

        if ($commit) {
            HostingOrder::updateOrCreate(['platform_id' => $platformId], $row);
        }
    }

    /** @param  array<string, mixed>  $row */
    private function importMember(array $row, bool $commit): void
    {
        $member = $this->resolveUser((string) ($row['member_public_id'] ?? ''));
        $platformAccountId = (int) ($row['hosting_account_id'] ?? 0);
        $localAccountId = $this->accountMap[$platformAccountId] ?? null;

        if (! $member || ! $localAccountId) {
            return;
        }

        unset($row['id'], $row['owner_public_id'], $row['member_public_id']);
        $row['user_id'] = $member->id;
        $row['hosting_account_id'] = $localAccountId;

        if (! empty($row['invited_by_user_id']) && ! User::query()->whereKey($row['invited_by_user_id'])->exists()) {
            $row['invited_by_user_id'] = null;
        }

        if ($commit) {
            HostingAccountMember::updateOrCreate(
                ['hosting_account_id' => $localAccountId, 'user_id' => $member->id],
                $row
            );
        }
    }

    /** @param  array<string, mixed>  $row */
    private function importInvoice(array $row, bool $commit): void
    {
        $platformId = (int) ($row['id'] ?? 0);
        $owner = $this->resolveUser((string) ($row['owner_public_id'] ?? ''));
        $platformAccountId = (int) ($row['hosting_account_id'] ?? 0);
        $localAccountId = $this->accountMap[$platformAccountId] ?? null;

        if (! $owner || ! $localAccountId) {
            return;
        }

        unset($row['id'], $row['owner_public_id'], $row['owner_email']);
        $row['user_id'] = $owner->id;
        $row['hosting_account_id'] = $localAccountId;
        $row['platform_id'] = $platformId;

        if ($commit) {
            HostingBillingInvoice::updateOrCreate(['platform_id' => $platformId], $row);
        }
    }

    /** @param  array<string, mixed>  $row */
    private function importPlanChange(array $row, bool $commit): void
    {
        $platformId = (int) ($row['id'] ?? 0);
        $owner = $this->resolveUser((string) ($row['owner_public_id'] ?? ''));
        $platformAccountId = (int) ($row['hosting_account_id'] ?? 0);
        $localAccountId = $this->accountMap[$platformAccountId] ?? null;

        if (! $owner || ! $localAccountId) {
            return;
        }

        unset($row['id'], $row['owner_public_id'], $row['owner_email']);
        $row['user_id'] = $owner->id;
        $row['hosting_account_id'] = $localAccountId;
        $row['platform_id'] = $platformId;

        if ($commit) {
            HostingPlanChange::updateOrCreate(['platform_id' => $platformId], $row);
        }
    }

    private function resolveUser(string $publicId, string $email = '', string $name = ''): ?User
    {
        if ($publicId === '') {
            return null;
        }

        $user = User::query()->where('public_id', $publicId)->first();
        if ($user || $email === '') {
            return $user;
        }

        return User::query()->create([
            'public_id' => $publicId,
            'email' => $email,
            'name' => $name !== '' ? $name : $email,
        ]);
    }

    /** @param  array<string, mixed>  $row */
    private function mapProductId(array &$row): void
    {
        $slug = (string) ($row['hosting_product_slug'] ?? '');
        unset($row['hosting_product_slug']);

        if ($slug === '') {
            return;
        }

        $product = HostingProduct::query()->where('slug', $slug)->first();
        if ($product) {
            $row['hosting_product_id'] = $product->id;
        }
    }
}