<?php

namespace Modules\Accounting\Console;

use Illuminate\Console\Command;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Schema;

class AccountingBackfillCommand extends Command
{
    protected $signature = 'accounting:backfill
        {--business_id= : Business ID}
        {--link-payment-accounts : Link payment accounts to GL by name match}
        {--posting-keys : Backfill posting_key on GL lines from posting logs}
        {--entity-tags : Backfill holding_entity_id from location mappings}
        {--auto-map : Auto-map recent unmapped transactions using location defaults}';

    protected $description = 'Backfill accounting integration data for holding rollout';

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

        if ($this->option('posting-keys')) {
            $this->backfillPostingKeys($businessId);
        }

        if ($this->option('link-payment-accounts')) {
            $this->linkPaymentAccounts($businessId);
        }

        if ($this->option('entity-tags')) {
            $this->backfillEntityTags($businessId);
        }

        if ($this->option('auto-map')) {
            $this->autoMapTransactions($businessId);
        }

        if (! $this->option('posting-keys') && ! $this->option('link-payment-accounts') && ! $this->option('entity-tags') && ! $this->option('auto-map')) {
            $this->backfillPostingKeys($businessId);
            $this->linkPaymentAccounts($businessId);
            $this->backfillEntityTags($businessId);
        }

        return self::SUCCESS;
    }

    protected function backfillPostingKeys(?string $businessId): void
    {
        if (! Schema::hasTable('accounting_posting_logs') || ! Schema::hasColumn('accounting_accounts_transactions', 'posting_key')) {
            $this->warn('Posting log tables not available.');

            return;
        }

        $logs = DB::table('accounting_posting_logs')->where('status', 'posted');
        if ($businessId) {
            $logs->where('business_id', $businessId);
        }

        $count = 0;
        foreach ($logs->get() as $log) {
            if (! $log->acc_trans_mapping_id) {
                continue;
            }

            $updated = DB::table('accounting_accounts_transactions')
                ->where('acc_trans_mapping_id', $log->acc_trans_mapping_id)
                ->whereNull('posting_key')
                ->update([
                    'posting_key' => $log->posting_key,
                    'source_type' => $log->source_type,
                    'source_id' => $log->source_id,
                ]);

            $count += $updated;
        }

        $this->info("Backfilled posting_key on {$count} GL line(s).");
    }

    protected function linkPaymentAccounts(?string $businessId): void
    {
        if (! Schema::hasColumn('accounts', 'accounting_account_id')) {
            $this->warn('accounts.accounting_account_id column not available.');

            return;
        }

        $query = DB::table('business');
        if ($businessId) {
            $query->where('id', $businessId);
        }

        $service = app(\Modules\Accounting\Services\PaymentAccountGlLinkService::class);
        $linked = 0;
        foreach ($query->pluck('id') as $id) {
            $linked += $service->linkByNameMatch((int) $id);
        }

        $this->info("Linked {$linked} payment account(s) to GL by name match.");
    }

    protected function backfillEntityTags(?string $businessId): void
    {
        if (! class_exists(\Modules\Accounting\Services\HoldingEntityResolutionService::class)) {
            return;
        }

        $service = app(\Modules\Accounting\Services\HoldingEntityResolutionService::class);
        $query = DB::table('business');
        if ($businessId) {
            $query->where('id', $businessId);
        }

        $total = 0;
        foreach ($query->pluck('id') as $id) {
            $total += $service->backfillUntagged((int) $id);
        }

        $this->info("Backfilled holding_entity_id on {$total} GL line(s).");
    }

    protected function autoMapTransactions(?string $businessId): void
    {
        if (! class_exists(\Modules\Accounting\Services\OperationalTransactionPostingService::class)) {
            return;
        }

        $service = app(\Modules\Accounting\Services\OperationalTransactionPostingService::class);
        $query = DB::table('business');
        if ($businessId) {
            $query->where('id', $businessId);
        }

        $mapped = 0;
        foreach ($query->pluck('id') as $business) {
            $mapped += $this->mapRecentTransactionsForBusiness((int) $business, $service);
        }

        $this->info("Auto-mapped {$mapped} operational transaction(s).");
    }

    protected function mapRecentTransactionsForBusiness(int $businessId, \Modules\Accounting\Services\OperationalTransactionPostingService $service): int
    {
        $since = now()->subDays(90)->toDateString();
        $count = 0;
        $userId = 1;

        $transactions = DB::table('transactions')
            ->where('business_id', $businessId)
            ->whereIn('type', ['sell', 'purchase', 'expense'])
            ->where('status', 'final')
            ->whereDate('transaction_date', '>=', $since)
            ->get(['id', 'type', 'location_id']);

        foreach ($transactions as $transaction) {
            if (DB::table('accounting_accounts_transactions')->where('transaction_id', $transaction->id)->exists()) {
                continue;
            }

            $location = DB::table('business_locations')->where('id', $transaction->location_id)->first();
            if (! $location) {
                continue;
            }

            $map = json_decode($location->accounting_default_map ?? '{}', true);
            $scenario = $transaction->type === 'sell' ? 'sale' : ($transaction->type === 'purchase' ? 'purchases' : 'expense');
            $depositTo = $map[$scenario]['deposit_to'] ?? null;
            $paymentAccount = $map[$scenario]['payment_account'] ?? null;

            if (! $depositTo || ! $paymentAccount) {
                continue;
            }

            $type = $transaction->type === 'sell' ? 'sell' : $transaction->type;
            $service->post($type, (int) $transaction->id, $userId, $businessId, (int) $depositTo, (int) $paymentAccount, (int) $transaction->location_id);
            $count++;
        }

        return $count;
    }
}