/**
 * IPC Handlers
 * Registers the renderer channels used by the opencode-first desktop app.
 */
import { app, BrowserWindow, dialog, ipcMain, shell } from 'electron';
import type { OpencodeManager } from '../opencode/manager';
import { registerHostApiProxyHandlers } from './ipc/host-api-proxy';
import { registerTranscriptExportHandler } from './ipc/transcript-export';
import { applyProxySettings } from './proxy';
import { syncLaunchAtStartupSettingFromStore } from './launch-at-startup';
import { getAllSettings, getSetting, resetSettings, setSetting, type AppSettings } from '../utils/store';
import { getProviderService } from '../services/providers/provider-service';
import type { ProviderConfig } from '../utils/secure-storage';
import type { ProviderAccount } from '../shared/providers/types';
import { validateApiKeyWithProvider } from '../services/providers/provider-validation';

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;
  };
};

function ok(id: string | undefined, data: unknown): UnifiedResponse {
  return { id, ok: true, data };
}

function fail(id: string | undefined, code: string, message: string, details?: unknown): UnifiedResponse {
  return {
    id,
    ok: false,
    error: { code, message, details },
  };
}

function unsupported(id: string | undefined, module: string, action: string): UnifiedResponse {
  return fail(id, 'UNSUPPORTED', `APP_REQUEST_UNSUPPORTED:${module}:${action}`);
}

function payloadArray(payload: unknown): unknown[] {
  return Array.isArray(payload) ? payload : payload === undefined ? [] : [payload];
}

async function applySettingsPatch(patch: Partial<AppSettings>): Promise<void> {
  for (const [key, value] of Object.entries(patch) as Array<[keyof AppSettings, AppSettings[keyof AppSettings]]>) {
    await setSetting(key, value);
  }

  if (
    Object.prototype.hasOwnProperty.call(patch, 'proxyEnabled')
    || Object.prototype.hasOwnProperty.call(patch, 'proxyServer')
    || Object.prototype.hasOwnProperty.call(patch, 'proxyHttpServer')
    || Object.prototype.hasOwnProperty.call(patch, 'proxyHttpsServer')
    || Object.prototype.hasOwnProperty.call(patch, 'proxyAllServer')
    || Object.prototype.hasOwnProperty.call(patch, 'proxyBypassRules')
  ) {
    await applyProxySettings(await getAllSettings());
  }

  if (Object.prototype.hasOwnProperty.call(patch, 'launchAtStartup')) {
    await syncLaunchAtStartupSettingFromStore();
  }
}

function normalizeProviderValidationPayload(payload: unknown): {
  providerId: string;
  apiKey: string;
  options?: { baseUrl?: string; apiProtocol?: string };
} {
  const args = payloadArray(payload);
  if (args.length > 1) {
    return {
      providerId: String(args[0] ?? ''),
      apiKey: String(args[1] ?? ''),
      options: args[2] as { baseUrl?: string; apiProtocol?: string } | undefined,
    };
  }

  const record = (args[0] && typeof args[0] === 'object' ? args[0] : {}) as Record<string, unknown>;
  return {
    providerId: String(record.providerId ?? record.accountId ?? ''),
    apiKey: String(record.apiKey ?? ''),
    options: record.options as { baseUrl?: string; apiProtocol?: string } | undefined,
  };
}

async function handleUnifiedProvider(action: string, payload: unknown): Promise<unknown> {
  const providerService = getProviderService();
  const args = payloadArray(payload);

  if (action === 'list') return providerService._listProvidersWithKeyInfoInternal();
  if (action === 'listVendors') return providerService.listVendors();
  if (action === 'listAccounts') return providerService.listAccounts();
  if (action === 'getDefault') return providerService._getDefaultProviderInternal();
  if (action === 'get') return providerService._getProviderInternal(String(args[0] ?? ''));
  if (action === 'hasApiKey') return providerService._hasProviderApiKeyInternal(String(args[0] ?? ''));
  if (action === 'getApiKey') return providerService._getProviderApiKeyInternal(String(args[0] ?? ''));

  if (action === 'save') {
    const body = (args[0] && typeof args[0] === 'object' ? args[0] : {}) as { config?: ProviderConfig; apiKey?: string };
    if (!body.config) throw new Error('Missing provider config');
    await providerService._saveProviderInternal(body.config);
    if (body.apiKey !== undefined && body.apiKey.trim()) {
      await providerService._setProviderApiKeyInternal(body.config.id, body.apiKey.trim());
    }
    return { success: true };
  }

  if (action === 'delete') {
    await providerService._deleteProviderInternal(String(args[0] ?? ''));
    return { success: true };
  }

  if (action === 'setApiKey') {
    await providerService._setProviderApiKeyInternal(String(args[0] ?? ''), String(args[1] ?? ''));
    return { success: true };
  }

  if (action === 'updateWithKey') {
    const providerId = String(args[0] ?? '');
    const updates = (args[1] ?? {}) as Partial<ProviderConfig>;
    const apiKey = typeof args[2] === 'string' ? args[2] : undefined;
    const existing = await providerService._getProviderInternal(providerId);
    if (!existing) throw new Error('Provider not found');
    const nextConfig = { ...existing, ...updates, updatedAt: new Date().toISOString() };
    await providerService._saveProviderInternal(nextConfig);
    if (apiKey !== undefined) {
      if (apiKey.trim()) {
        await providerService._setProviderApiKeyInternal(providerId, apiKey.trim());
      } else {
        await providerService._deleteProviderApiKeyInternal(providerId);
      }
    }
    return { success: true };
  }

  if (action === 'deleteApiKey') {
    await providerService._deleteProviderApiKeyInternal(String(args[0] ?? ''));
    return { success: true };
  }

  if (action === 'setDefault') {
    await providerService._setDefaultProviderInternal(String(args[0] ?? ''));
    return { success: true };
  }

  if (action === 'validateKey') {
    const validation = normalizeProviderValidationPayload(payload);
    const provider = await providerService._getProviderInternal(validation.providerId);
    const providerType = provider?.type || validation.providerId;
    return validateApiKeyWithProvider(providerType, validation.apiKey, {
      baseUrl: validation.options?.baseUrl || provider?.baseUrl,
      apiProtocol: validation.options?.apiProtocol || provider?.apiProtocol,
    });
  }

  if (action === 'createAccount') {
    const body = (args[0] && typeof args[0] === 'object' ? args[0] : {}) as { account?: ProviderAccount; apiKey?: string };
    if (!body.account) throw new Error('Missing provider account');
    return providerService.createAccount(body.account, body.apiKey);
  }

  throw new Error(`Unsupported provider action: ${action}`);
}

async function handleUnifiedRequest(
  request: UnifiedRequest,
  opencodeManager: OpencodeManager,
): Promise<UnifiedResponse> {
  const id = request.id;
  const module = request.module || '';
  const action = request.action || '';

  try {
    if (module === 'app') {
      if (action === 'version') return ok(id, app.getVersion());
      if (action === 'name') return ok(id, app.getName());
      if (action === 'platform') return ok(id, process.platform);
      return unsupported(id, module, action);
    }

    if (module === 'opencode') {
      if (action === 'status') return ok(id, opencodeManager.getStatus());
      return unsupported(id, module, action);
    }

    if (module === 'settings') {
      if (action === 'getAll') return ok(id, await getAllSettings());
      if (action === 'get') {
        const key = ((request.payload && typeof request.payload === 'object')
          ? (request.payload as { key?: keyof AppSettings }).key
          : undefined) as keyof AppSettings | undefined;
        return ok(id, key ? await getSetting(key) : undefined);
      }
      if (action === 'set') {
        const body = (request.payload && typeof request.payload === 'object'
          ? request.payload
          : {}) as { key?: keyof AppSettings; value?: AppSettings[keyof AppSettings] };
        if (!body.key) throw new Error('Missing settings key');
        await applySettingsPatch({ [body.key]: body.value } as Partial<AppSettings>);
        return ok(id, { success: true });
      }
      if (action === 'setMany') {
        await applySettingsPatch((request.payload ?? {}) as Partial<AppSettings>);
        return ok(id, { success: true });
      }
      if (action === 'reset') {
        await resetSettings();
        return ok(id, { success: true, settings: await getAllSettings() });
      }
      return unsupported(id, module, action);
    }

    if (module === 'provider') {
      return ok(id, await handleUnifiedProvider(action, request.payload));
    }

    return unsupported(id, module, action);
  } catch (error) {
    return fail(id, 'INTERNAL_ERROR', error instanceof Error ? error.message : String(error), error);
  }
}

export function registerIpcHandlers(
  _legacyRuntimeManager: unknown,
  opencodeManager: OpencodeManager,
  _legacyMarketplaceService: unknown,
  mainWindow: BrowserWindow,
): void {
  registerHostApiProxyHandlers();
  registerTranscriptExportHandler(mainWindow);

  ipcMain.handle('app:request', async (_event, request: UnifiedRequest) => (
    handleUnifiedRequest(request, opencodeManager)
  ));

  ipcMain.handle('app:version', () => app.getVersion());
  ipcMain.handle('app:name', () => app.getName());
  ipcMain.handle('app:platform', () => process.platform);
  ipcMain.handle('app:getPath', (_event, name: Parameters<typeof app.getPath>[0]) => app.getPath(name));
  ipcMain.handle('app:quit', () => app.quit());
  ipcMain.handle('app:relaunch', () => {
    app.relaunch();
    app.exit(0);
  });

  ipcMain.handle('opencode:status', () => opencodeManager.getStatus());
  ipcMain.handle('opencode:start', () => opencodeManager.start());
  ipcMain.handle('opencode:stop', async () => {
    await opencodeManager.stop();
    return opencodeManager.getStatus();
  });
  ipcMain.handle('opencode:restart', () => opencodeManager.restart());
  ipcMain.handle('opencode:health', () => opencodeManager.checkHealth());

  ipcMain.handle('settings:getAll', () => getAllSettings());
  ipcMain.handle('settings:get', (_event, payload: { key?: keyof AppSettings } | keyof AppSettings) => {
    const key = typeof payload === 'string' ? payload : payload?.key;
    return key ? getSetting(key) : undefined;
  });
  ipcMain.handle('settings:set', async (_event, payload: { key: keyof AppSettings; value: AppSettings[keyof AppSettings] }) => {
    await applySettingsPatch({ [payload.key]: payload.value } as Partial<AppSettings>);
    return { success: true };
  });
  ipcMain.handle('settings:setMany', async (_event, patch: Partial<AppSettings>) => {
    await applySettingsPatch(patch);
    return { success: true };
  });
  ipcMain.handle('settings:reset', async () => {
    await resetSettings();
    return { success: true, settings: await getAllSettings() };
  });

  ipcMain.handle('shell:openExternal', (_event, url: string) => shell.openExternal(url));
  ipcMain.handle('shell:showItemInFolder', (_event, path: string) => shell.showItemInFolder(path));
  ipcMain.handle('shell:openPath', (_event, path: string) => shell.openPath(path));

  ipcMain.handle('dialog:open', (_event, options: Electron.OpenDialogOptions) => dialog.showOpenDialog(mainWindow, options));
  ipcMain.handle('dialog:save', (_event, options: Electron.SaveDialogOptions) => dialog.showSaveDialog(mainWindow, options));
  ipcMain.handle('dialog:message', (_event, options: Electron.MessageBoxOptions) => dialog.showMessageBox(mainWindow, options));

  ipcMain.handle('window:minimize', () => mainWindow.minimize());
  ipcMain.handle('window:maximize', () => {
    if (mainWindow.isMaximized()) {
      mainWindow.unmaximize();
      return false;
    }
    mainWindow.maximize();
    return true;
  });
  ipcMain.handle('window:close', () => mainWindow.close());
  ipcMain.handle('window:isMaximized', () => mainWindow.isMaximized());
}