import { commitTransaction, createLocalReq, getMigrations, initTransaction, killTransaction, readMigrationFiles } from 'payload';
import { getTransaction } from './utilities/getTransaction.js';
import { migrationTableExists } from './utilities/migrationTableExists.js';
import { parseError } from './utilities/parseError.js';
export async function migrateDown() {
    const { payload } = this;
    const migrationFiles = await readMigrationFiles({
        payload
    });
    const { existingMigrations, latestBatch } = await getMigrations({
        payload
    });
    if (!existingMigrations?.length) {
        payload.logger.info({
            msg: 'No migrations to rollback.'
        });
        return;
    }
    payload.logger.info({
        msg: `Rolling back batch ${latestBatch} consisting of ${existingMigrations.length} migration(s).`
    });
    const latestBatchMigrations = existingMigrations.filter(({ batch })=>batch === latestBatch);
    for (const migration of latestBatchMigrations){
        const migrationFile = migrationFiles.find((m)=>m.name === migration.name);
        if (!migrationFile) {
            throw new Error(`Migration ${migration.name} not found locally.`);
        }
        const start = Date.now();
        const req = await createLocalReq({}, payload);
        try {
            payload.logger.info({
                msg: `Migrating down: ${migrationFile.name}`
            });
            await initTransaction(req);
            const db = await getTransaction(this, req);
            await migrationFile.down({
                db,
                payload,
                req
            });
            payload.logger.info({
                msg: `Migrated down:  ${migrationFile.name} (${Date.now() - start}ms)`
            });
            const tableExists = await migrationTableExists(this, db);
            if (tableExists) {
                await payload.delete({
                    id: migration.id,
                    collection: 'payload-migrations',
                    req
                });
            }
            await commitTransaction(req);
        } catch (err) {
            await killTransaction(req);
            payload.logger.error({
                err,
                msg: parseError(err, `Error migrating down ${migrationFile.name}. Rolling back.`)
            });
            process.exit(1);
        }
    }
}

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