import { describe, expect, it } from 'vitest'
import type { ConnectionConfig } from '../../../src/config/types.js'
import { MissingDatabaseError, resolveDatabase } from '../../../src/db/driver.js'

const config: ConnectionConfig = {
    name: 'c',
    type: 'postgres',
    host: 'h',
    user: 'u',
    readonly: false
}

describe('resolveDatabase', () => {
    it('prefers the explicit parameter', () => {
        expect(resolveDatabase({ ...config, database: 'default-db' }, 'explicit')).toBe('explicit')
    })

    it('falls back to the connection default', () => {
        expect(resolveDatabase({ ...config, database: 'default-db' }, undefined)).toBe('default-db')
    })

    it('throws when neither is set', () => {
        expect(() => resolveDatabase(config, undefined)).toThrow(MissingDatabaseError)
    })
})