import {Directive, OptionDefinition} from '../../cli'
import {Injectable} from '../../di'
import {stringToPascal} from '../../util'
import {templateMigration} from '../template/migration'
import {CLIDirective} from '../../cli/decorators'

/**
 * CLI directive that creates migration classes from template.
 */
@Injectable()
@CLIDirective()
export class CreateMigrationDirective extends Directive {
    getDescription(): string {
        return 'create a new migration'
    }

    getKeywords(): string | string[] {
        return ['create-migration', 'make-migration']
    }

    getOptions(): OptionDefinition[] {
        return [
            '{description} | Description of what the migration does',
        ]
    }

    getHelpText(): string {
        return [
            'Creates a new migration file in `src/app/migrations`.',
            'To use, specify a string describing what the migration does. For example:',
            './ex create-migration "Add version column to sessions table"',
        ].join('\n\n')
    }

    async handle(): Promise<void> {
        const description = this.option('description')
        const className = `${stringToPascal(description)}Migration`
        const fileName = `${(new Date()).toISOString()}_${className}.migration.ts`
        const path = this.app().path('..', 'src', 'app', 'migrations', fileName)

        // Create the migrations directory, if it doesn't already exist
        await path.concat('..').mkdir()

        // Render the template
        const rendered = await templateMigration.render(className, className, path)
        await path.write(rendered)

        this.success(`Created migration: ${className}`)
    }
}