import type { IncomingMessage } from 'node:http';

//----------------- HTTP RESPONSE SHAPES ------------
/**
 * Canonical success envelope used by backend APIs that return a structured payload.
 *
 * Use this for route handlers that need a stable `success/data` shape so frontend
 * consumers can parse responses consistently across endpoints.
 */
export type ApiSuccessShape<TData = unknown> = {
  success: true;
  data: TData;
};

/**
 * Generic plain-object record used when parsing loosely typed JSON payloads.
 *
 * Use this only after runtime shape checks, not as a replacement for validated
 * domain models.
 */
export type AnyRecord = Record<string, any>;

// ---------------------------
//----------------- WEBSOCKET TRANSPORT TYPES ------------
/**
 * Minimal websocket client contract used by backend broadcaster services.
 *
 * Any transport object added to `connectedClients` must implement these two
 * members so shared services can safely send JSON strings and check whether the
 * socket is still open before broadcasting.
 */
export type RealtimeClientConnection = {
  readyState: number;
  send(data: string): void;
};

/**
 * Authenticated user payload attached to websocket upgrade requests.
 *
 * Platform and OSS auth flows currently use either `id` or `userId`; both are
 * represented here so websocket handlers can resolve a stable writer user id.
 */
export type AuthenticatedWebSocketUser = {
  id?: string | number;
  userId?: string | number;
  username?: string;
  [key: string]: unknown;
};

/**
 * HTTP upgrade request shape after websocket authentication succeeds.
 *
 * `verifyClient` populates `request.user` with the authenticated payload, and
 * downstream websocket handlers rely on this extended request type.
 */
export type AuthenticatedWebSocketRequest = IncomingMessage & {
  user?: AuthenticatedWebSocketUser;
};

// ---------------------------
//----------------- PROVIDER MESSAGE MODEL ------------
/**
 * Providers supported by the unified server runtime.
 *
 * Use this as the source of truth whenever a function or payload needs to identify
 * a specific LLM integration.
 */
export type LLMProvider = 'claude' | 'codex' | 'gemini' | 'cursor';

/**
 * Message/event variants emitted by provider adapters and normalized transports.
 *
 * Keep this union in sync with event kinds produced by provider session adapters.
 */
export type MessageKind =
  | 'text'
  | 'tool_use'
  | 'tool_result'
  | 'thinking'
  | 'stream_delta'
  | 'stream_end'
  | 'error'
  | 'complete'
  | 'status'
  | 'permission_request'
  | 'permission_cancelled'
  | 'session_created'
  | 'interactive_prompt'
  | 'task_notification';

/**
 * Provider-neutral message envelope used in REST responses and realtime channels.
 *
 * Every provider-specific message must be converted into this shape before being
 * emitted outside provider-specific modules.
 */
export type NormalizedMessage = {
  id: string;
  sessionId: string;
  timestamp: string;
  provider: LLMProvider;
  kind: MessageKind;
  role?: 'user' | 'assistant';
  content?: string;
  images?: unknown;
  toolName?: string;
  toolInput?: unknown;
  toolId?: string;
  toolResult?: {
    content?: string;
    isError?: boolean;
    toolUseResult?: unknown;
  };
  isError?: boolean;
  text?: string;
  tokens?: number;
  canInterrupt?: boolean;
  requestId?: string;
  input?: unknown;
  context?: unknown;
  reason?: string;
  newSessionId?: string;
  status?: string;
  summary?: string;
  tokenBudget?: unknown;
  subagentTools?: unknown;
  toolUseResult?: unknown;
  sequence?: number;
  rowid?: number;
  [key: string]: unknown;
};

/**
 * Shared options used to fetch historical provider messages.
 *
 * Consumers should pass provider-specific lookup hints (`projectPath`) only
 * when the selected provider requires them.
 */
export type FetchHistoryOptions = {
  projectPath?: string;
  limit?: number | null;
  offset?: number;
};

/**
 * Standardized response payload returned from provider history readers.
 *
 * Use this as the contract for APIs that return paginated conversation history.
 */
export type FetchHistoryResult = {
  messages: NormalizedMessage[];
  total: number;
  hasMore: boolean;
  offset: number;
  limit: number | null;
  tokenUsage?: unknown;
};

// ---------------------------
//----------------- SHARED ERROR TYPES ------------
/**
 * Optional metadata used when constructing application-level errors.
 *
 * `statusCode` should reflect the HTTP response status, while `code` identifies
 * the stable machine-readable error category.
 */
export type AppErrorOptions = {
  code?: string;
  statusCode?: number;
  details?: unknown;
};

// ---------------------------
//----------------- MCP TYPES ------------
/**
 * Scope where an MCP server definition is stored and resolved.
 *
 * `user` is global for a user account, `local` is provider-local, and `project`
 * is tied to a specific project path.
 */
export type McpScope = 'user' | 'local' | 'project';

/**
 * Transport protocol used by an MCP server definition.
 */
export type McpTransport = 'stdio' | 'http' | 'sse';

/**
 * Normalized MCP server model exposed to frontend and route handlers.
 *
 * Provider adapters should map provider-native config to this structure before
 * returning results.
 */
export type ProviderMcpServer = {
  provider: LLMProvider;
  name: string;
  scope: McpScope;
  transport: McpTransport;
  command?: string;
  args?: string[];
  env?: Record<string, string>;
  cwd?: string;
  url?: string;
  headers?: Record<string, string>;
  envVars?: string[];
  bearerTokenEnvVar?: string;
  envHttpHeaders?: Record<string, string>;
};

/**
 * Payload for create/update MCP server operations.
 *
 * Routes and services should accept this type, validate it, and then persist it
 * through provider-specific MCP repositories.
 */
export type UpsertProviderMcpServerInput = {
  name: string;
  scope?: McpScope;
  transport: McpTransport;
  workspacePath?: string;
  command?: string;
  args?: string[];
  env?: Record<string, string>;
  cwd?: string;
  url?: string;
  headers?: Record<string, string>;
  envVars?: string[];
  bearerTokenEnvVar?: string;
  envHttpHeaders?: Record<string, string>;
};

// ---------------------------
//----------------- PROVIDER AUTH TYPES ------------
/**
 * Authentication status result returned by provider health checks.
 *
 * This shape is consumed by settings/status endpoints to report installation and
 * credential state for each provider.
 */
export type ProviderAuthStatus = {
  installed: boolean;
  provider: LLMProvider;
  authenticated: boolean;
  email: string | null;
  method: string | null;
  error?: string;
};

// ---------------------------
//----------------- SHARED DATABASE CREDENTIAL TYPES ------------
/**
 * Safe credential view returned by credential listing APIs.
 *
 * This intentionally excludes the raw credential secret while still exposing
 * metadata needed for UI rendering and management operations.
 */
export type CredentialPublicRow = {
  id: number;
  credential_name: string;
  credential_type: string;
  description: string | null;
  created_at: string;
  is_active: number;
};

/**
 * Result returned after creating a credential record.
 *
 * Use this return shape when callers need the created id and display metadata,
 * but must never receive the stored secret value.
 */
export type CreateCredentialResult = {
  id: number | bigint;
  credentialName: string;
  credentialType: string;
};

// ---------------------------
//----------------- PROJECT PERSISTENCE TYPES ------------
/**
 * Canonical project row shape returned by the projects repository.
 *
 * Use this type whenever backend services need to pass around one database
 * project record without leaking raw SQL row typing across modules.
 */
export type ProjectRepositoryRow = {
  project_id: string;
  project_path: string;
  custom_project_name: string | null;
  isStarred: number;
  isArchived: number;
};

/**
 * Result category returned by `projectsDb.createProjectPath`.
 *
 * `created` means a fresh row was inserted, `reactivated_archived` means an
 * existing archived path was accepted and updated, and `active_conflict` means
 * an already-active path blocked project creation.
 */
export type CreateProjectPathOutcome =
  | 'created'
  | 'reactivated_archived'
  | 'active_conflict';

/**
 * Structured result returned by project-path upsert operations.
 *
 * Services should use this result to decide whether a request succeeded,
 * should return a conflict, or needs follow-up retrieval of row metadata.
 */
export type CreateProjectPathResult = {
  outcome: CreateProjectPathOutcome;
  project: ProjectRepositoryRow | null;
};

/**
 * Validation result for user-supplied workspace/project paths.
 *
 * `resolvedPath` is present only when validation succeeds. `error` is present
 * only when validation fails and is suitable for user-facing diagnostics.
 */
export type WorkspacePathValidationResult = {
  valid: boolean;
  resolvedPath?: string;
  error?: string;
};