<?php
namespace ProVM\Generator;

use DateTimeInterface;
use DateInterval;
use PDOException;
use Psr\Log\LoggerInterface;
use Symfony\Component\Console\Style\StyleInterface;
use ProVM\Concept;
use ProVM\Enforce;
use ProVM\Repository;

class Migration extends Enforce\Generator
{
    public function __construct(
        protected Concept\Database $database,
        protected Concept\Database\Connection $connection,
        protected Concept\Database\Query\Builder $queryBuilder,
        public Repository\Table $tableRepository,
        LoggerInterface $logger,
        protected DateTimeInterface $startDate,
        protected string $databaseName,
        protected string $migrationsPath,
        protected array $skips)
    {
        parent::__construct($logger);
    }

    public function generate(StyleInterface $io, bool $dryRun = false): void
    {
        $this->log('Running generate migrations' . (($dryRun) ? ' [dry-run]' : ''), true, $io);
        foreach ($this->tableRepository->getAll() as $tableName) {
            if (in_array($tableName, $this->skips)) {
                continue;
            }
            $this->log("Table: {$tableName}", true, $io);
            $filename = $this->buildFilename($tableName);
            $this->log("Filename: {$filename}", $dryRun, $io);
            $content = $this->buildFile($tableName);
            $this->log("Content: {$content}");

            if ($dryRun) {
                $status = file_put_contents($filename, $content);
                $this->log("Saved: " . var_export($status, true));
                try {
                    $this->registerMigration($tableName);
                } catch (PDOException $exception) {
                    $this->logger->warning($exception);
                }
            }
        }
        $this->log("Total tables migrated: " . count($this->tableRepository->getAll()), true, $io);
    }

    protected function buildFilename(string $table): string
    {
        $i = $this->tableRepository->getIndex($table);
        $time = $this->startDate->add(new DateInterval("PT{$i}S"));
        return implode(DIRECTORY_SEPARATOR, [
            $this->migrationsPath,
            "{$time->format('YmdHis')}_create_{$table}.php"
        ]);
    }
    protected function buildClassName(string $table): string
    {
        return 'Create' . str_replace(' ', '', ucwords(str_replace('_', ' ', $table)));
    }
    protected function buildHeader(): string
    {
        return "<?php

use Phinx\Db\Adapter\MysqlAdapter;
";
    }
    protected function buildClass(string $table): string
    {
        return "class {$this->buildClassName($table)} extends Phinx\Migration\AbstractMigration";
    }
    protected function buildFunction(string $table): string
    {
        $output = ["{", "\tpublic function change(): void", "\t{"];
        $output []= $this->buildInitialSetup();
        $this->tableRepository->getDefinition($table);
        $output []= $this->tableRepository->parseDefinition($table);
        $output []= $this->buildFinalSetup();
        $output []= "\t}";
        return implode(PHP_EOL, $output);
    }
    protected function buildInitialSetup(): string
    {
        return implode(PHP_EOL, [
            "\t\t\$this->execute('SET unique_checks=0; SET foreign_key_checks=0;');",
            "\t\t\$this->execute(\"ALTER DATABASE CHARACTER SET 'utf8mb4';\");",
            "\t\t\$this->execute(\"ALTER DATABASE COLLATE='utf8mb4_general_ci';\");",
            ''
        ]);
    }
    protected function buildFinalSetup(): string
    {
        return "\t\t\$this->execute('SET unique_checks=1; SET foreign_key_checks=1;');";
    }
    protected function buildFile(string $table): string
    {
        return implode(PHP_EOL, [
            $this->buildHeader(),
            $this->buildClass($table),
            $this->buildFunction($table),
            '}',
            ''
        ]);
    }
    protected function registerMigration(string $table): void
    {
        $i = $this->tableRepository->getIndex($table);
        $time = $this->startDate->add(new DateInterval("PT{$i}S"));
        $this->logger->info("Registering migration: {$time->format('Y-m-d H:i:s')}");
        $migrationName = $this->buildClassName($table);

        $query = $this->queryBuilder
            ->insert()
            ->into('phinxlog')
            ->columns(['version', 'migration_name', 'start_time', 'end_time', 'breakpoint'])
            ->values(['?', '?', '?', '?', 0]);

        $this->connection->execute($query, [
            $time->format('YmdHis'),
            $migrationName,
            $time->format('Y-m-d H:i:s'),
            $time->format('Y-m-d H:i:s')
        ]);
    }
}