<?php

declare(strict_types=1);

namespace DoctrineMigrations;

use Doctrine\DBAL\Schema\Schema;
use Doctrine\Migrations\AbstractMigration;

final class Version20260331150000 extends AbstractMigration
{
    public function getDescription(): string
    {
        return 'Major refactoring: English enums, unified days field, nullable task.schema, detach single tasks';
    }

    public function up(Schema $schema): void
    {
        // 1. Migrate enum values to English
        $this->addSql("UPDATE task SET status = 'active' WHERE status = 'aktiv'");
        $this->addSql("UPDATE task SET status = 'done' WHERE status = 'erledigt'");

        $this->addSql("UPDATE task_schema SET status = 'active' WHERE status = 'aktiv'");
        $this->addSql("UPDATE task_schema SET status = 'disabled' WHERE status IN ('erledigt', 'inaktiv')");

        $this->addSql("UPDATE task_schema SET task_type = 'single' WHERE task_type = 'einzel'");
        $this->addSql("UPDATE task_schema SET task_type = 'daily' WHERE task_type = 'taeglich'");
        $this->addSql("UPDATE task_schema SET task_type = 'custom' WHERE task_type IN ('multi', 'woechentlich', 'monatlich', 'jaehrlich')");

        // 2. Add unified days column
        $this->addSql('ALTER TABLE task_schema ADD days JSON DEFAULT NULL');

        // 3. Migrate weekdays/monthDays/yearDays into days JSON via PHP
        $this->migrateDaysData();

        // 4. Drop old columns from task_schema
        $this->addSql('ALTER TABLE task_schema DROP deadline, DROP weekdays, DROP month_days, DROP year_days');

        // 5. Backfill task names/categories from schema (for all tasks that relied on getEffectiveName fallback)
        $this->addSql("UPDATE task t INNER JOIN task_schema ts ON t.task_id = ts.id SET t.name = ts.name WHERE t.name IS NULL");
        $this->addSql("UPDATE task t INNER JOIN task_schema ts ON t.task_id = ts.id SET t.category_id = ts.category_id WHERE t.category_id IS NULL AND ts.category_id IS NOT NULL");

        // 6. Detach single tasks
        $this->addSql("UPDATE task t INNER JOIN task_schema ts ON t.task_id = ts.id SET t.name = ts.name WHERE ts.task_type = 'single' AND t.name IS NULL");
        $this->addSql("UPDATE task t INNER JOIN task_schema ts ON t.task_id = ts.id SET t.category_id = ts.category_id WHERE ts.task_type = 'single' AND t.category_id IS NULL");

        // Drop FK + unique constraint before modifying task_id
        $this->addSql('ALTER TABLE task DROP FOREIGN KEY FK_527EDB258DB60186');
        $this->addSql('DROP INDEX UNIQ_527EDB258DB60186AA9E377A ON task');

        // Detach single tasks
        $this->addSql("UPDATE task t INNER JOIN task_schema ts ON t.task_id = ts.id SET t.task_id = NULL WHERE ts.task_type = 'single'");

        // Delete single schemas
        $this->addSql("DELETE FROM task_schema WHERE task_type = 'single'");

        // Make task_id nullable with SET NULL on delete
        $this->addSql('ALTER TABLE task MODIFY task_id INT DEFAULT NULL');
        $this->addSql('ALTER TABLE task ADD CONSTRAINT FK_527EDB258DB60186 FOREIGN KEY (task_id) REFERENCES task_schema (id) ON DELETE SET NULL');
    }

    private function migrateDaysData(): void
    {
        $rows = $this->connection->fetchAllAssociative(
            'SELECT id, weekdays, month_days, year_days FROM task_schema'
        );

        foreach ($rows as $row) {
            $days = [];

            $weekdays = $row['weekdays'] ? json_decode($row['weekdays'], true) : null;
            $monthDays = $row['month_days'] ? json_decode($row['month_days'], true) : null;
            $yearDays = $row['year_days'] ? json_decode($row['year_days'], true) : null;

            if (!empty($weekdays)) {
                $days['week'] = $weekdays;
            }
            if (!empty($monthDays)) {
                $days['month'] = $monthDays;
            }
            if (!empty($yearDays)) {
                $days['year'] = $yearDays;
            }

            if (!empty($days)) {
                $this->connection->executeStatement(
                    'UPDATE task_schema SET days = ? WHERE id = ?',
                    [json_encode($days), $row['id']]
                );
            }
        }
    }

    public function down(Schema $schema): void
    {
        $this->addSql('ALTER TABLE task_schema ADD deadline DATE DEFAULT NULL, ADD weekdays JSON DEFAULT NULL, ADD month_days JSON DEFAULT NULL, ADD year_days JSON DEFAULT NULL');
        $this->addSql('ALTER TABLE task_schema DROP days');

        $this->addSql('ALTER TABLE task DROP FOREIGN KEY FK_527EDB258DB60186');
        $this->addSql('ALTER TABLE task MODIFY task_id INT NOT NULL');
        $this->addSql('ALTER TABLE task ADD CONSTRAINT FK_527EDB258DB60186 FOREIGN KEY (task_id) REFERENCES task_schema (id) ON DELETE CASCADE');
        $this->addSql('CREATE UNIQUE INDEX UNIQ_527EDB258DB60186AA9E377A ON task (task_id, date)');

        $this->addSql("UPDATE task SET status = 'aktiv' WHERE status = 'active'");
        $this->addSql("UPDATE task SET status = 'erledigt' WHERE status = 'done'");
        $this->addSql("UPDATE task_schema SET status = 'aktiv' WHERE status = 'active'");
        $this->addSql("UPDATE task_schema SET status = 'inaktiv' WHERE status = 'disabled'");
        $this->addSql("UPDATE task_schema SET task_type = 'einzel' WHERE task_type = 'single'");
        $this->addSql("UPDATE task_schema SET task_type = 'taeglich' WHERE task_type = 'daily'");
    }
}