<?php

namespace App\Console\Commands;

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

class RetryCopyCommand extends Command
{
    protected $signature = 'db:re-copy {table : The name of the table to retry the native COPY command for.}';
    protected $description = 'Finds the latest CSV file and attempts to execute the native PostgreSQL COPY FROM (server-side) using DB::statement().';

    // Base directory, MUST BE ACCESSIBLE by the PostgreSQL service user.
    protected $baseTempDir = 'C:\Temp\pg_imports';

    public function handle()
    {
        $tableName = $this->argument('table');
        $this->info("===============================================================");
        $this->info("🔄 ATTEMPTING NATIVE DB::statement() COPY for **{$tableName}**");
        $this->info("===============================================================");

        if (!File::isDirectory($this->baseTempDir)) {
            $this->error("❌ ERROR: Base directory not found: {$this->baseTempDir}");
            return Command::FAILURE;
        }

        // 1. Find the latest CSV file
        $latestFile = $this->findLatestCsvFile($tableName);

        if (!$latestFile) {
            $this->error("❌ ERROR: No recent CSV file found for table '{$tableName}' in {$this->baseTempDir}.");
            return Command::FAILURE;
        }

        $fullPath = $this->baseTempDir . DIRECTORY_SEPARATOR . $latestFile;
        // Important: PostgreSQL requires forward slashes or escaped backslashes in the path string
        $pgPath = str_replace('\\', '/', $fullPath);
        $this->line("✅ Using file path: **{$pgPath}**");

        // 2. Prepare database environment
        $this->disablePostgresConstraints();
        $this->warn('Constraints temporarily disabled.');

        // Obtener las columnas preservando el case original
        $columns = $this->getTableColumns($tableName);
        $columnList = implode(', ', array_map(function($c) { return "\"$c\""; }, $columns));

        try {
            // 3. Execute COPY FROM using DB::statement()
            // Usar comillas dobles para preservar el case del nombre de la tabla
            $sql = "COPY \"{$tableName}\" ({$columnList}) FROM '$pgPath' WITH (DELIMITER E'\t', FORMAT CSV, ENCODING 'UTF-8', QUOTE '\"', ESCAPE '\\')";

            $this->line("Executing SQL: COPY \"{$tableName}\" FROM '{$pgPath}'...");
            DB::statement($sql);

            // 4. Finalization
            $this->enablePostgresConstraints();
            $this->resetPostgresSequences($tableName);

            // Re-check the file exists before deleting, just in case
            if (file_exists($fullPath)) {
                unlink($fullPath);
                $this->warn("Temporary file deleted: {$latestFile}");
            }

            $this->info("🎉 SUCCESS! Data copied successfully using DB::statement().");
            return Command::SUCCESS;

        } catch (\Exception $e) {
            $this->error("❌ COPY failed via DB::statement(). Error: " . $e->getMessage());
            $this->error("HINT: If the error is 'Permission denied', the service user cannot read the file at {$pgPath}.");
            $this->enablePostgresConstraints();
            return Command::FAILURE;
        }
    }

    /**
     * Obtiene las columnas de la tabla preservando el case original
     */
    protected function getTableColumns(string $tableName): array
    {
        $query = "
            SELECT column_name
            FROM information_schema.columns
            WHERE table_name = ?
            ORDER BY ordinal_position
        ";

        $columns = DB::select($query, [$tableName]);

        return array_map(function($col) {
            return $col->column_name;
        }, $columns);
    }

    /**
     * Finds the most recent CSV file matching the table name pattern.
     */
    protected function findLatestCsvFile(string $tableName): ?string
    {
        $files = File::files($this->baseTempDir);
        $latestFile = null;
        $latestTime = 0;
        // Usar preg_quote para escapar caracteres especiales en el nombre de la tabla
        $escapedTableName = preg_quote($tableName, '/');
        $pattern = "/^{$escapedTableName}_import_temp_\d+\.csv$/";

        foreach ($files as $file) {
            $fileName = $file->getFilename();
            if (preg_match($pattern, $fileName)) {
                $fileTime = $file->getMTime();
                if ($fileTime > $latestTime) {
                    $latestTime = $fileTime;
                    $latestFile = $fileName;
                }
            }
        }

        return $latestFile;
    }

    // Auxiliary Methods
    protected function getPkColumn(string $tableName): string
    {
        // Placeholder: Needs implementation using getSerialColumns or schema inspection
        return 'id' . $tableName;
    }

    protected function disablePostgresConstraints(): void
    {
        DB::statement("SET session_replication_role = 'replica'");
    }

    protected function enablePostgresConstraints(): void
    {
        DB::statement("SET session_replication_role = 'origin'");
    }

    protected function resetPostgresSequences(string $tableName): void
    {
        // This method requires the full implementation from the main command.
        // For brevity, we assume it's copied over correctly.
    }

    protected function getSerialColumns(string $tableName): array
    {
        // This method requires the full implementation from the main command.
        // For brevity, we assume it's copied over correctly.
        return [];
    }
}