import { DatabaseSaveTrigger } from "../../utils/database-save-trigger.js";
import { getDb, getSqlite } from "../db/index.js";
import { needsExplicitPersist, resolveDatabaseDialect } from "../db/dialect.js";
import { primeSettingsCache, readCachedSetting } from "./settings-cache.js";
import type { DatabaseContext } from "./database-context.js";
import { ApiKeyRepository } from "./api-key-repository.js";
import { AuditLogRepository } from "./audit-log-repository.js";
import { CredentialRepository } from "./credential-repository.js";
import { HostFolderRepository } from "./host-folder-repository.js";
import { HostRepository } from "./host-repository.js";
import { HostResolutionRepository } from "./host-resolution-repository.js";
import { HostSidebarPreferenceRepository } from "./host-sidebar-preference-repository.js";
import { CredentialSidebarPreferenceRepository } from "./credential-sidebar-preference-repository.js";
import { UiPreferenceRepository } from "./ui-preference-repository.js";
import { OpenTabRepository } from "./open-tab-repository.js";
import { PluginRepository } from "./plugin-repository.js";
import { PluginStorageRepository } from "./plugin-storage-repository.js";
import { PluginSettingsRepository } from "./plugin-settings-repository.js";
import { HostDefaultsRepository } from "./host-defaults-repository.js";
import { PluginMigrationRepository } from "./plugin-migration-repository.js";
import { PluginInstallCountRepository } from "./plugin-install-count-repository.js";
import { PluginPermissionGrantRepository } from "./plugin-permission-grant-repository.js";
import { UserAuthRepository } from "./user-auth-repository.js";
import { RbacAccessRepository } from "./rbac-access-repository.js";
import { RbacPermissionRepository } from "./rbac-permission-repository.js";
import { RoleRepository } from "./role-repository.js";
import { SessionRepository } from "./session-repository.js";
import { CredentialAccessRepository } from "./credential-access-repository.js";
import { SharedCredentialSecretsRepository } from "./shared-credential-secrets-repository.js";
import { FolderAccessRepository } from "./folder-access-repository.js";
import { SettingsRepository } from "./settings-repository.js";
import { HostProtocolAuthRepository } from "./host-protocol-auth-repository.js";
import { SharedHostAuthOverrideRepository } from "./shared-host-auth-override-repository.js";
import { SharedHostSecretsRepository } from "./shared-host-secrets-repository.js";
import { SshCredentialUsageRepository } from "./ssh-credential-usage-repository.js";
import { TrustedDeviceRepository } from "./trusted-device-repository.js";
import { UserDataExportRepository } from "./user-data-export-repository.js";
import { UserPreferenceRepository } from "./user-preference-repository.js";
import { UserRepository } from "./user-repository.js";

/**
 * The context every repository runs against.
 *
 * The dialect has to be resolved, not assumed: it is what `returning.ts` reads
 * to decide whether it can ask for RETURNING, and whether an upsert spells
 * itself `onConflictDoUpdate` or `onDuplicateKeyUpdate`. Reporting "sqlite"
 * while connected to MySQL makes the second of those a TypeError on the first
 * write.
 *
 * Both cross-dialect harnesses build a DatabaseContext themselves, so neither
 * exercises this function, see tests/database/repositories/factory-context.
 */
export function createCurrentRepositoryContext(): DatabaseContext {
  return {
    dialect: resolveDatabaseDialect(),
    drizzle: getDb(),
  };
}

/**
 * Post-write hook handed to every repository.
 *
 * Only meaningful for SQLite, where the database lives in memory and has to be
 * serialised back to its encrypted file. On Postgres and MySQL the write is
 * already durable, so no hook is installed at all rather than one that does
 * nothing, repositories call it as `this.onWrite?.()`.
 */
export function createCurrentRepositoryWriteHook(
  reason: string,
): (() => Promise<void>) | undefined {
  if (!needsExplicitPersist(resolveDatabaseDialect())) return undefined;
  return () => DatabaseSaveTrigger.forceSave(reason);
}

/**
 * Post-write hook for high-frequency, non-critical writes (telemetry
 * inserts/cleanup, informational timestamp touches).
 *
 * Marks the in-memory database dirty and lets DatabaseSaveTrigger's existing
 * debounce coalesce the actual serialize+encrypt, instead of forcing one on
 * every single sample. Losing up to 30 seconds of these on a crash is
 * acceptable; blocking the event loop that serves SSH traffic on every metric
 * sample is not.
 */
export function createCurrentRepositoryLazyWriteHook(
  reason: string,
): (() => Promise<void>) | undefined {
  if (!needsExplicitPersist(resolveDatabaseDialect())) return undefined;
  return () => DatabaseSaveTrigger.triggerSave(reason);
}

/**
 * Raw driver handle for the few synchronous call sites that cannot await,
 * getCurrentSettingValue below, and settings reads during startup. Repositories
 * must not use this: they take a DatabaseContext, which is drizzle-only.
 * Porting to another engine means giving these callers an async path first.
 */
export function getCurrentRepositorySqlite() {
  return getSqlite();
}

/**
 * Synchronous settings read.
 *
 * SQLite can be queried synchronously, so it is read directly and stays
 * authoritative. Other engines have no synchronous query, so the value comes
 * from the cache primed at startup and kept current by SettingsRepository.
 */
export function getCurrentSettingValue(key: string): string | null {
  if (!needsExplicitPersist(resolveDatabaseDialect())) {
    return readCachedSetting(key);
  }

  const row = getCurrentRepositorySqlite()
    .prepare("SELECT value FROM settings WHERE key = ?")
    .get(key) as { value?: string } | undefined;

  return row?.value ?? null;
}

export function createCurrentApiKeyRepository(): ApiKeyRepository {
  return new ApiKeyRepository(
    createCurrentRepositoryContext(),
    createCurrentRepositoryWriteHook("api_key_repository_write"),
  );
}

export function createCurrentAuditLogRepository(): AuditLogRepository {
  return new AuditLogRepository(
    createCurrentRepositoryContext(),
    // Rows land on every audited call; the audited action saves on its own.
    createCurrentRepositoryLazyWriteHook("audit_log_repository_write"),
  );
}

export function createCurrentCredentialRepository(): CredentialRepository {
  return new CredentialRepository(
    createCurrentRepositoryContext(),
    createCurrentRepositoryWriteHook("credential_repository_write"),
  );
}

export function createCurrentHostFolderRepository(): HostFolderRepository {
  return new HostFolderRepository(
    createCurrentRepositoryContext(),
    createCurrentRepositoryWriteHook("host_folder_repository_write"),
  );
}

export function createCurrentHostRepository(): HostRepository {
  return new HostRepository(
    createCurrentRepositoryContext(),
    createCurrentRepositoryWriteHook("host_repository_write"),
  );
}

export function createCurrentHostResolutionRepository(): HostResolutionRepository {
  return new HostResolutionRepository(
    createCurrentRepositoryContext(),
    createCurrentRepositoryWriteHook("host_resolution_repository_write"),
    createCurrentRepositoryLazyWriteHook(
      "host_resolution_repository_lazy_write",
    ),
  );
}

export function createCurrentHostSidebarPreferenceRepository(): HostSidebarPreferenceRepository {
  return new HostSidebarPreferenceRepository(
    createCurrentRepositoryContext(),
    createCurrentRepositoryWriteHook(
      "host_sidebar_preference_repository_write",
    ),
  );
}

export function createCurrentCredentialSidebarPreferenceRepository(): CredentialSidebarPreferenceRepository {
  return new CredentialSidebarPreferenceRepository(
    createCurrentRepositoryContext(),
    createCurrentRepositoryWriteHook(
      "credential_sidebar_preference_repository_write",
    ),
  );
}

export function createCurrentUiPreferenceRepository(): UiPreferenceRepository {
  return new UiPreferenceRepository(
    createCurrentRepositoryContext(),
    createCurrentRepositoryWriteHook("ui_preference_repository_write"),
  );
}

export function createCurrentOpenTabRepository(): OpenTabRepository {
  return new OpenTabRepository(
    createCurrentRepositoryContext(),
    createCurrentRepositoryWriteHook("open_tab_repository_write"),
  );
}

export function createCurrentPluginRepository(): PluginRepository {
  return new PluginRepository(
    createCurrentRepositoryContext(),
    createCurrentRepositoryWriteHook("plugin_repository_write"),
  );
}

export function createCurrentUserAuthRepository(): UserAuthRepository {
  return new UserAuthRepository(
    createCurrentRepositoryContext(),
    createCurrentRepositoryWriteHook("user_auth_repository_write"),
  );
}

export function createCurrentPluginPermissionGrantRepository(): PluginPermissionGrantRepository {
  return new PluginPermissionGrantRepository(
    createCurrentRepositoryContext(),
    createCurrentRepositoryWriteHook(
      "plugin_permission_grant_repository_write",
    ),
  );
}

export function createCurrentPluginStorageRepository(): PluginStorageRepository {
  return new PluginStorageRepository(
    createCurrentRepositoryContext(),
    createCurrentRepositoryWriteHook("plugin_storage_repository_write"),
  );
}

export function createCurrentHostDefaultsRepository(): HostDefaultsRepository {
  return new HostDefaultsRepository(
    createCurrentRepositoryContext(),
    createCurrentRepositoryWriteHook("host_defaults_repository_write"),
  );
}

export function createCurrentPluginSettingsRepository(): PluginSettingsRepository {
  return new PluginSettingsRepository(
    createCurrentRepositoryContext(),
    createCurrentRepositoryWriteHook("plugin_settings_repository_write"),
  );
}

export function createCurrentPluginInstallCountRepository(): PluginInstallCountRepository {
  return new PluginInstallCountRepository(
    createCurrentRepositoryContext(),
    createCurrentRepositoryWriteHook("plugin_install_count_repository_write"),
  );
}

export function createCurrentPluginMigrationRepository(): PluginMigrationRepository {
  return new PluginMigrationRepository(
    createCurrentRepositoryContext(),
    createCurrentRepositoryWriteHook("plugin_migration_repository_write"),
  );
}

export function createCurrentRbacPermissionRepository(): RbacPermissionRepository {
  return new RbacPermissionRepository(
    createCurrentRepositoryContext(),
    createCurrentRepositoryWriteHook("rbac_permission_repository_write"),
  );
}

export function createCurrentRbacAccessRepository(): RbacAccessRepository {
  return new RbacAccessRepository(
    createCurrentRepositoryContext(),
    createCurrentRepositoryWriteHook("rbac_access_repository_write"),
  );
}

export function createCurrentRoleRepository(): RoleRepository {
  return new RoleRepository(
    createCurrentRepositoryContext(),
    createCurrentRepositoryWriteHook("role_repository_write"),
  );
}

export function createCurrentSessionRepository(): SessionRepository {
  return new SessionRepository(
    createCurrentRepositoryContext(),
    createCurrentRepositoryWriteHook("session_repository_write"),
    // Activity timestamps are informational; the periodic flush persists them.
    needsExplicitPersist(resolveDatabaseDialect())
      ? () => DatabaseSaveTrigger.markDirty()
      : undefined,
  );
}

export function createCurrentSettingsRepository(): SettingsRepository {
  return new SettingsRepository(
    createCurrentRepositoryContext(),
    createCurrentRepositoryWriteHook("settings_repository_write"),
  );
}

export function createCurrentSharedHostSecretsRepository(): SharedHostSecretsRepository {
  return new SharedHostSecretsRepository(
    createCurrentRepositoryContext(),
    createCurrentRepositoryWriteHook("shared_host_secrets_repository_write"),
  );
}

export function createCurrentHostProtocolAuthRepository(): HostProtocolAuthRepository {
  return new HostProtocolAuthRepository(
    createCurrentRepositoryContext(),
    createCurrentRepositoryWriteHook("host_protocol_auth_repository_write"),
  );
}

export function createCurrentSharedHostAuthOverrideRepository(): SharedHostAuthOverrideRepository {
  return new SharedHostAuthOverrideRepository(
    createCurrentRepositoryContext(),
    createCurrentRepositoryWriteHook(
      "shared_host_auth_override_repository_write",
    ),
  );
}

export function createCurrentSshCredentialUsageRepository(): SshCredentialUsageRepository {
  return new SshCredentialUsageRepository(
    createCurrentRepositoryContext(),
    createCurrentRepositoryWriteHook("ssh_credential_usage_repository_write"),
  );
}

export function createCurrentTrustedDeviceRepository(): TrustedDeviceRepository {
  return new TrustedDeviceRepository(
    createCurrentRepositoryContext(),
    createCurrentRepositoryWriteHook("trusted_device_repository_write"),
  );
}

export function createCurrentUserDataExportRepository(): UserDataExportRepository {
  return new UserDataExportRepository(createCurrentRepositoryContext());
}

export function createCurrentUserPreferenceRepository(): UserPreferenceRepository {
  return new UserPreferenceRepository(
    createCurrentRepositoryContext(),
    createCurrentRepositoryWriteHook("user_preference_repository_write"),
  );
}

export function createCurrentUserRepository(): UserRepository {
  return new UserRepository(
    createCurrentRepositoryContext(),
    createCurrentRepositoryWriteHook("user_repository_write"),
  );
}

export function createCurrentFolderAccessRepository(): FolderAccessRepository {
  return new FolderAccessRepository(
    createCurrentRepositoryContext(),
    createCurrentRepositoryWriteHook("folder_access_repository_write"),
  );
}

export function createCurrentCredentialAccessRepository(): CredentialAccessRepository {
  return new CredentialAccessRepository(
    createCurrentRepositoryContext(),
    createCurrentRepositoryWriteHook("credential_access_repository_write"),
  );
}

export function createCurrentSharedCredentialSecretsRepository(): SharedCredentialSecretsRepository {
  return new SharedCredentialSecretsRepository(
    createCurrentRepositoryContext(),
    createCurrentRepositoryWriteHook(
      "shared_credential_secrets_repository_write",
    ),
  );
}

/**
 * Loads the settings cache. Must run during startup on engines without a
 * synchronous read, before anything calls getCurrentSettingValue.
 */
export async function primeCurrentSettingsCache(): Promise<void> {
  const rows = await createCurrentSettingsRepository().listAll();
  primeSettingsCache(rows);
}

/**
 * How often a replica re-reads the settings table.
 *
 * Override with SETTINGS_CACHE_REFRESH_SECONDS; 0 disables the refresh.
 */
const REFRESH_SECONDS_ENV = "SETTINGS_CACHE_REFRESH_SECONDS";
const DEFAULT_REFRESH_SECONDS = 30;

let refreshTimer: NodeJS.Timeout | null = null;

/**
 * Keeps the settings cache from drifting on a multi-replica deployment.
 *
 * The cache is per-process and updated in the process that writes. That is
 * enough for SQLite, where there is only ever one process. On Postgres and
 * MySQL, which exist here precisely so more than one instance can share the
 * data, a setting changed on one replica would otherwise never reach the
 * others, because the synchronous read has no way to go back to the database.
 *
 * Periodic re-priming does not make the value immediately consistent. It bounds
 * how long it can be wrong, which is the difference between a setting that
 * takes effect on the next tick and one that takes effect at the next restart.
 */
export function startSettingsCacheRefresh(
  env = process.env,
  refresh: () => Promise<void> = primeCurrentSettingsCache,
): void {
  if (refreshTimer) return;

  const seconds = refreshIntervalSeconds(env);
  if (seconds === null) return;

  refreshTimer = setInterval(() => {
    void refresh().catch(() => {
      // A failed refresh leaves the previous values in place, which is the
      // right outcome: a transient database blip should not blank the cache.
      // Every caller reads a missing setting as "use the default", so an empty
      // cache would silently revert configuration across the deployment.
    });
  }, seconds * 1000);

  refreshTimer.unref();
}

/** The configured interval, or null when refreshing is switched off. */
export function refreshIntervalSeconds(env = process.env): number | null {
  const seconds = Number(env[REFRESH_SECONDS_ENV] ?? DEFAULT_REFRESH_SECONDS);
  return Number.isFinite(seconds) && seconds > 0 ? seconds : null;
}

/** Test seam. */
export function stopSettingsCacheRefresh(): void {
  if (!refreshTimer) return;
  clearInterval(refreshTimer);
  refreshTimer = null;
}