import {
  AppError,
  mapBackendErrorCode,
  normalizeAppError,
  type AppErrorCode,
} from './error-model';

export { AppError } from './error-model';

type UnifiedRequest = {
  id: string;
  module: string;
  action: string;
  payload?: unknown;
};

type UnifiedResponse = {
  id?: string;
  ok: boolean;
  data?: unknown;
  error?: {
    code?: string;
    message?: string;
    details?: unknown;
  };
};

const UNIFIED_CHANNELS = new Set<string>([
  'app:version',
  'app:name',
  'app:platform',
  'opencode:status',
  'settings:getAll',
  'settings:get',
  'settings:set',
  'settings:setMany',
  'settings:reset',
  'provider:list',
  'provider:get',
  'provider:getDefault',
  'provider:hasApiKey',
  'provider:getApiKey',
  'provider:validateKey',
  'provider:save',
  'provider:delete',
  'provider:setApiKey',
  'provider:updateWithKey',
  'provider:deleteApiKey',
  'provider:setDefault',
  'update:status',
  'update:version',
  'update:check',
  'update:download',
  'update:install',
  'update:setChannel',
  'update:setAutoDownload',
  'update:cancelAutoInstall',
]);

function toUnifiedRequest(channel: string, args: unknown[]): UnifiedRequest {
  const splitIndex = channel.indexOf(':');
  return {
    id: `${Date.now()}-${Math.random().toString(36).slice(2, 8)}`,
    module: channel.slice(0, splitIndex),
    action: channel.slice(splitIndex + 1),
    payload: args.length <= 1 ? args[0] : args,
  };
}

function mapUnifiedError(response: UnifiedResponse): AppError {
  const message = response.error?.message || 'Unified IPC request failed';
  return new AppError(mapBackendErrorCode(response.error?.code), message, response.error?.details);
}

async function invokeViaIpc<T>(channel: string, args: unknown[]): Promise<T> {
  if (channel !== 'app:request' && UNIFIED_CHANNELS.has(channel)) {
    const request = toUnifiedRequest(channel, args);

    try {
      const response = await window.electron.ipcRenderer.invoke('app:request', request) as UnifiedResponse;
      if (!response?.ok) {
        const message = response?.error?.message || 'Unified IPC request failed';
        if (message.includes('APP_REQUEST_UNSUPPORTED:')) {
          throw new Error(message);
        }
        throw mapUnifiedError(response);
      }
      return response.data as T;
    } catch (error) {
      const message = error instanceof Error ? error.message : String(error);
      if (
        !message.includes('APP_REQUEST_UNSUPPORTED:')
        && !message.includes('Invalid IPC channel: app:request')
      ) {
        throw normalizeAppError(error, { transport: 'ipc', channel, source: 'app:request' });
      }
    }
  }

  try {
    return await window.electron.ipcRenderer.invoke(channel, ...args) as T;
  } catch (error) {
    throw normalizeAppError(error, { transport: 'ipc', channel, source: 'legacy-ipc' });
  }
}

export async function invokeApi<T>(channel: string, ...args: unknown[]): Promise<T> {
  return invokeViaIpc<T>(channel, args);
}

export async function invokeIpc<T>(channel: string, ...args: unknown[]): Promise<T> {
  return invokeApi<T>(channel, ...args);
}

export async function invokeIpcWithRetry<T>(
  channel: string,
  args: unknown[] = [],
  retries = 1,
  retryable: AppErrorCode[] = ['TIMEOUT', 'NETWORK'],
): Promise<T> {
  let lastError: unknown;

  for (let attempt = 0; attempt <= retries; attempt += 1) {
    try {
      return await invokeApi<T>(channel, ...args);
    } catch (error) {
      lastError = error;
      if (!(error instanceof AppError) || !retryable.includes(error.code) || attempt === retries) {
        throw error;
      }
    }
  }

  throw normalizeAppError(lastError);
}

export function initializeDefaultTransports(): void {
  // IPC is the only renderer-to-main transport in the opencode-based app.
}

export function toUserMessage(error: unknown): string {
  const appError = error instanceof AppError ? error : normalizeAppError(error);

  switch (appError.code) {
    case 'AUTH_INVALID':
      return 'Authentication failed. Check API key or login session and retry.';
    case 'TIMEOUT':
      return 'Request timed out. Please retry.';
    case 'RATE_LIMIT':
      return 'Too many requests. Please wait and try again.';
    case 'PERMISSION':
      return 'Permission denied. Check your configuration and retry.';
    case 'CHANNEL_UNAVAILABLE':
      return 'Service channel unavailable. Retry after restarting Makelore.';
    case 'NETWORK':
      return 'Network error. Please verify connectivity and retry.';
    case 'CONFIG':
      return 'Configuration is invalid. Please review settings.';
    case 'RUNTIME':
      return 'Runtime is unavailable. Start or restart it and retry.';
    default:
      return appError.message || 'Unexpected error occurred.';
  }
}

export type FilePreviewError =
  | 'outsideSandbox'
  | 'readOnlyRoot'
  | 'tooLarge'
  | 'binary'
  | 'notFound'
  | 'notDirectory'
  | 'invalidContent'
  | string;

export interface ReadTextFileResult {
  ok: boolean;
  content?: string;
  mimeType?: string;
  size?: number;
  readOnly?: boolean;
  error?: FilePreviewError;
}

export interface ReadBinaryFileResult {
  ok: boolean;
  data?: Uint8Array;
  mimeType?: string;
  size?: number;
  readOnly?: boolean;
  error?: FilePreviewError;
}

export interface ReadBinaryFileOptions {
  maxBytes?: number;
}

export interface WriteTextFileResult {
  ok: boolean;
  error?: FilePreviewError;
}

export interface StatFileResult {
  ok: boolean;
  size?: number;
  mtime?: number;
  isFile?: boolean;
  isDir?: boolean;
  readOnly?: boolean;
  error?: FilePreviewError;
}

export interface ListDirEntry {
  name: string;
  path: string;
  isDir: boolean;
  size: number;
}

export interface ListDirResult {
  ok: boolean;
  entries?: ListDirEntry[];
  error?: FilePreviewError;
}

export interface TreeNode {
  name: string;
  relPath: string;
  absPath: string;
  isDir: boolean;
  size?: number;
  mtime?: number;
  children?: TreeNode[];
}

export interface ListTreeOptions {
  maxDepth?: number;
  maxNodes?: number;
  includeHidden?: boolean;
}

export interface ListTreeResult {
  ok: boolean;
  root?: TreeNode;
  truncated?: boolean;
  error?: FilePreviewError;
}

export const readTextFile = (path: string): Promise<ReadTextFileResult> =>
  invokeIpc<ReadTextFileResult>('file:readText', path);

export const readBinaryFile = (
  path: string,
  opts?: ReadBinaryFileOptions,
): Promise<ReadBinaryFileResult> =>
  invokeIpc<ReadBinaryFileResult>('file:readBinary', path, opts);

export const writeTextFile = (path: string, content: string): Promise<WriteTextFileResult> =>
  invokeIpc<WriteTextFileResult>('file:writeText', path, content);

interface SaveTranscriptResult {
  status: 'saved' | 'cancelled';
}

export async function saveMarkdownTranscript(
  defaultPath: string,
  markdown: string,
): Promise<'saved' | 'cancelled'> {
  const result = await invokeIpc<SaveTranscriptResult>('transcript:save', {
    defaultPath,
    markdown,
  });
  if (result.status !== 'saved' && result.status !== 'cancelled') {
    throw new Error('Invalid transcript save result');
  }
  return result.status;
}

export const statFile = (path: string): Promise<StatFileResult> =>
  invokeIpc<StatFileResult>('file:stat', path);

export const listDir = (path: string): Promise<ListDirResult> =>
  invokeIpc<ListDirResult>('file:listDir', path);

export const listTree = (path: string, opts?: ListTreeOptions): Promise<ListTreeResult> =>
  invokeIpc<ListTreeResult>('file:listTree', path, opts);