const path = require("path")

const { getConfigFile } = require("medusa-core-utils")
const { dropDatabase } = require("pg-god")
const { DataSource } = require("typeorm")
const dbFactory = require("./use-template-db")

const DB_HOST = process.env.DB_HOST
const DB_USERNAME = process.env.DB_USERNAME
const DB_PASSWORD = process.env.DB_PASSWORD
const DB_NAME = process.env.DB_TEMP_NAME
const DB_URL = `postgres://${DB_USERNAME}:${DB_PASSWORD}@${DB_HOST}/${DB_NAME}`

const pgGodCredentials = {
  user: DB_USERNAME,
  password: DB_PASSWORD,
  host: DB_HOST,
}

const keepTables = [
  "store",
  "staged_job",
  "shipping_profile",
  "fulfillment_provider",
  "payment_provider",
  "country",
  "currency",
]

const DbTestUtil = {
  db_: null,

  setDb: function (dataSource) {
    this.db_ = dataSource
  },

  clear: async function () {
    this.db_.synchronize(true)
  },

  teardown: async function ({ forceDelete } = {}) {
    forceDelete = forceDelete || []

    const entities = this.db_.entityMetadatas

    const manager = this.db_.manager

    await manager.query(`SET session_replication_role = 'replica';`)

    for (const entity of entities) {
      if (
        keepTables.includes(entity.tableName) &&
        !forceDelete.includes(entity.tableName)
      ) {
        continue
      }

      await manager.query(`DELETE
                           FROM "${entity.tableName}";`)
    }

    await manager.query(`SET session_replication_role = 'origin';`)
  },

  shutdown: async function () {
    await this.db_.destroy()
    return await dropDatabase({ DB_NAME }, pgGodCredentials)
  },
}

const instance = DbTestUtil

module.exports = {
  initDb: async function ({ cwd, database_extra }) {
    const { configModule } = getConfigFile(cwd, `medusa-config`)
    const { featureFlags } = configModule

    const featureFlagsLoader =
      require("@medusajs/medusa/dist/loaders/feature-flags").default

    const featureFlagsRouter = featureFlagsLoader({ featureFlags })
    const modelsLoader = require("@medusajs/medusa/dist/loaders/models").default
    const entities = modelsLoader({}, { register: false })

    await dbFactory.createFromTemplate(DB_NAME)

    // get migrations with enabled featureflags
    const migrationDir = path.resolve(
      path.join(
        __dirname,
        `../../`,
        `node_modules`,
        `@medusajs`,
        `medusa`,
        `dist`,
        `migrations`,
        `*.js`
      )
    )

    const {
      getEnabledMigrations,
      getModuleSharedResources,
    } = require("@medusajs/medusa/dist/commands/utils/get-migrations")

    const { migrations: moduleMigrations, models: moduleModels } =
      getModuleSharedResources(configModule, featureFlagsRouter)

    const enabledMigrations = getEnabledMigrations([migrationDir], (flag) =>
      featureFlagsRouter.isFeatureEnabled(flag)
    )

    const enabledEntities = entities.filter(
      (e) => typeof e.isFeatureEnabled === "undefined" || e.isFeatureEnabled()
    )

    const dbDataSource = new DataSource({
      type: "postgres",
      url: DB_URL,
      entities: enabledEntities.concat(moduleModels),
      migrations: enabledMigrations.concat(moduleMigrations),
      extra: database_extra ?? {},
      name: "integration-tests",
    })

    await dbDataSource.initialize()

    await dbDataSource.runMigrations()

    instance.setDb(dbDataSource)
    return dbDataSource
  },
  useDb: function () {
    return instance
  },
}