import { registerAs } from "@nestjs/config";
import { TypeOrmModuleOptions } from "@nestjs/typeorm";
import { DataSourceOptions } from "typeorm";
import { join, dirname } from "path";
import {
  DefaultPosition,
  DefaultUnit,
  EmployeePosition,
  Employee,
  OrganizationConfiguration,
  GlobalOrganizationConfiguration,
  OrganizationType,
  Organization,
  PositionConfiguration,
  PositionPermission,
  PositionTypeConfiguration,
  PositionTypePermission,
  PositionType,
  Position,
  Project,
  GlobalUnitConfiguration,
  Unit,
  EmployeeSignature,
  EmployeeStamp,
  RecordFooter,
  RecordHeader,
  Seal,
  AccountConfiguration,
  Application,
  DocumentaryRequirement,
  Permission,
  RolePermission,
  Role,
  Session,
  UserCredential,
  UserDocument,
  UserRole,
  UserVerification,
  User,
  Notification,
  NotificationEvent,
  NotificationPlaceholder,
  NotificationReceiverField,
  NotificationReceiver,
  NotificationTemplate,
} from "@tria-plc/iamapi-common";
import { OrganizationSetting } from "@tria-plc/iamapi-common/entities/iam/organization-structure/organization-setting.entity";
import { UnitSetting } from "@tria-plc/iamapi-common/entities/iam/organization-structure/unit-setting.entity";
import { UnitDetail } from "@tria-plc/iamapi-common/entities/iam/organization-structure/unit-detail.entity";
import { OrganizationDetail } from "@tria-plc/iamapi-common/entities/iam/organization-structure/organization-detail.entity";
import { UnitCluster } from "@tria-plc/iamapi-common/entities/iam/organization-structure/unit-cluster.entity";
import { Location } from "@tria-plc/iamapi-common/entities/iam/organization-structure/location.entity";
import { LocationType } from "@tria-plc/iamapi-common/entities/iam/organization-structure/location-type.entity";
import { DelegationTerminationReason } from "@tria-plc/iamapi-common/entities/iam/organization-structure/delegation-termination-reason.entity";
import { EmployeePositionActivePeriod } from "@tria-plc/iamapi-common/entities/iam/organization-structure/employee-position-active-period.entity";
import { UnitConfiguration } from "@tria-plc/iamapi-common/entities/iam/organization-structure/unit-configuration.entity";
import { Site } from "@tria-plc/iamapi-common/entities/iam/site/site.entity";
import { SiteSetting } from "@tria-plc/iamapi-common/entities/iam/site/site-setting.entity";
import { AuditLog, AuditLogCommand } from "@tria-plc/auditlog";

// @tria-plc/auditlog's entities live in node_modules, same as the iam ones —
// the glob below only matches this app's own src/**/*.entity.ts.
const auditEntities = [AuditLog, AuditLogCommand];

const iamEntities = [
  UnitSetting,
  UnitDetail,
  OrganizationDetail,
  UnitCluster,
  Location,
  LocationType,
  DelegationTerminationReason,
  EmployeePositionActivePeriod,
  UnitConfiguration,
  Site,
  SiteSetting,
  DefaultPosition,
  DefaultUnit,
  EmployeePosition,
  Employee,
  OrganizationConfiguration,
  GlobalOrganizationConfiguration,
  OrganizationSetting,
  OrganizationType,
  Organization,
  PositionConfiguration,
  PositionPermission,
  PositionTypeConfiguration,
  PositionTypePermission,
  PositionType,
  Position,
  Project,
  GlobalUnitConfiguration,
  Unit,
  EmployeeSignature,
  EmployeeStamp,
  RecordFooter,
  RecordHeader,
  Seal,
  AccountConfiguration,
  Application,
  DocumentaryRequirement,
  Permission,
  RolePermission,
  Role,
  Session,
  UserCredential,
  UserDocument,
  UserRole,
  UserVerification,
  User,
  Notification,
  NotificationEvent,
  NotificationPlaceholder,
  NotificationReceiverField,
  NotificationReceiver,
  NotificationTemplate,
];

const iamMigrationsGlob = join(
  dirname(require.resolve("@tria-plc/iamapi-common/package.json")),
  "dist/db/migrations/*.js",
);
const freightMigrationsGlob = join(__dirname, "../migrations/*.js");

/**
 * Migration history is split per owner instead of sharing one `public.migrations`
 * table:
 *
 * - IAM migrations ship with `@tria-plc/iamapi-common`, target the `iam` schema
 *   and are recorded in `iam.typeorm_migrations` — the same table the package's
 *   own CLI (`pnpm iam:migration:run|show|revert`) uses, so both paths agree on
 *   what has been applied.
 * - Freight migrations are recorded in `freight.migrations`.
 *
 * `public.migrations` is the pre-split table; `src/scripts/migrate.ts` adopts its
 * rows into the two tables above on first run and then leaves it untouched.
 */
export const IAM_MIGRATIONS = {
  schema: "iam",
  table: "typeorm_migrations",
} as const;

export const FREIGHT_MIGRATIONS = {
  schema: "freight",
  table: "migrations",
} as const;

export const LEGACY_MIGRATIONS = {
  schema: "public",
  table: "migrations",
} as const;

function buildConnectionOptions() {
  return {
    type: "postgres" as const,
    host: process.env.DB_HOST ?? "localhost",
    port: parseInt(process.env.DB_PORT ?? "5433", 10),
    username: process.env.DB_USER ?? "postgres",
    password: process.env.DB_PASSWORD ?? "",
    database: process.env.DB_NAME ?? "edr_freight",
    // NOTE: do NOT pass `extra.options: '-c search_path=...'`. That sends the
    // Postgres startup `options` parameter, which connection poolers (PgBouncer /
    // proxies fronting the remote edr_dev DB) reject with
    // `08P01 unsupported startup parameter in options: search_path`.
    // The search_path is instead applied per-connection via a pool `connect`
    // handler (app.module.ts `setPoolSearchPath`, migrate.ts `applySearchPath`).
    synchronize: false,
    logging:
      process.env.TYPEORM_LOGGING === "true"
        ? true
        : (["error", "warn"] as DataSourceOptions["logging"]),
  };
}

/**
 * Runtime options for the API (and the seed scripts using `AppDataSource`).
 * Carries no migrations: migrations run only through `src/scripts/migrate.ts`,
 * which uses the two dedicated DataSources below.
 */
export function buildDataSourceOptions(): DataSourceOptions {
  return {
    ...buildConnectionOptions(),
    schema: "public",
    entities: [
      __dirname + "/../**/*.entity.{ts,js}",
      ...iamEntities,
      ...auditEntities,
    ],
    migrations: [],
  };
}

/** IAM migrations only, recorded in `iam.typeorm_migrations`. */
export function buildIamMigrationDataSourceOptions(): DataSourceOptions {
  return {
    ...buildConnectionOptions(),
    schema: IAM_MIGRATIONS.schema,
    entities: [],
    migrations: [iamMigrationsGlob],
    migrationsTableName: IAM_MIGRATIONS.table,
    migrationsTransactionMode: "each",
  };
}

/** Freight migrations only, recorded in `freight.migrations`. */
export function buildFreightMigrationDataSourceOptions(): DataSourceOptions {
  return {
    ...buildConnectionOptions(),
    schema: FREIGHT_MIGRATIONS.schema,
    entities: [],
    migrations: [freightMigrationsGlob],
    migrationsTableName: FREIGHT_MIGRATIONS.table,
    migrationsTransactionMode: "each",
  };
}

export default registerAs("database", (): TypeOrmModuleOptions => ({
  ...buildDataSourceOptions(),
  autoLoadEntities: true,
  migrationsRun: false,
}));