import { http, HttpResponse } from "msw";
import type { AppId } from "@/lib/api/types";
import type { McpServer, Provider, Settings } from "@/types";
import {
  addProvider,
  deleteProvider,
  getCurrentProviderId,
  getProviders,
  listProviders,
  resetProviderState,
  setCurrentProviderId,
  updateProvider,
  updateSortOrder,
  getSettings,
  setSettings,
  getAppConfigDirOverride,
  setAppConfigDirOverrideState,
  getMcpConfig,
  setMcpServerEnabled,
  upsertMcpServer,
  deleteMcpServer,
} from "./state";

const TAURI_ENDPOINT = "http://tauri.local";

const withJson = async <T>(request: Request): Promise<T> => {
  try {
    const body = await request.text();
    if (!body) return {} as T;
    return JSON.parse(body) as T;
  } catch {
    return {} as T;
  }
};

const success = <T>(payload: T) => HttpResponse.json(payload as any);

export const handlers = [
  http.post(`${TAURI_ENDPOINT}/get_providers`, async ({ request }) => {
    const { app } = await withJson<{ app: AppId }>(request);
    return success(getProviders(app));
  }),

  http.post(`${TAURI_ENDPOINT}/get_current_provider`, async ({ request }) => {
    const { app } = await withJson<{ app: AppId }>(request);
    return success(getCurrentProviderId(app));
  }),

  http.post(
    `${TAURI_ENDPOINT}/update_providers_sort_order`,
    async ({ request }) => {
      const { updates = [], app } = await withJson<{
        updates: { id: string; sortIndex: number }[];
        app: AppId;
      }>(request);
      updateSortOrder(app, updates);
      return success(true);
    },
  ),

  http.post(`${TAURI_ENDPOINT}/update_tray_menu`, () => success(true)),

  http.post(`${TAURI_ENDPOINT}/switch_provider`, async ({ request }) => {
    const { id, app } = await withJson<{ id: string; app: AppId }>(request);
    const providers = listProviders(app);
    if (!providers[id]) {
      return HttpResponse.json(false, { status: 404 });
    }
    setCurrentProviderId(app, id);
    return success(true);
  }),

  http.post(`${TAURI_ENDPOINT}/add_provider`, async ({ request }) => {
    const { provider, app } = await withJson<{
      provider: Provider & { id?: string };
      app: AppId;
    }>(request);

    const newId = provider.id ?? `mock-${Date.now()}`;
    addProvider(app, { ...provider, id: newId });
    return success(true);
  }),

  http.post(`${TAURI_ENDPOINT}/update_provider`, async ({ request }) => {
    const { provider, app } = await withJson<{
      provider: Provider;
      app: AppId;
    }>(request);
    updateProvider(app, provider);
    return success(true);
  }),

  http.post(`${TAURI_ENDPOINT}/delete_provider`, async ({ request }) => {
    const { id, app } = await withJson<{ id: string; app: AppId }>(request);
    deleteProvider(app, id);
    return success(true);
  }),

  http.post(`${TAURI_ENDPOINT}/import_default_config`, async () => {
    resetProviderState();
    return success(true);
  }),

  http.post(`${TAURI_ENDPOINT}/open_external`, () => success(true)),

  // MCP APIs
  http.post(`${TAURI_ENDPOINT}/get_mcp_config`, async ({ request }) => {
    const { app } = await withJson<{ app: AppId }>(request);
    return success(getMcpConfig(app));
  }),

  http.post(`${TAURI_ENDPOINT}/import_mcp_from_claude`, () => success(1)),
  http.post(`${TAURI_ENDPOINT}/import_mcp_from_codex`, () => success(1)),

  http.post(`${TAURI_ENDPOINT}/set_mcp_enabled`, async ({ request }) => {
    const { app, id, enabled } = await withJson<{
      app: AppId;
      id: string;
      enabled: boolean;
    }>(request);
    setMcpServerEnabled(app, id, enabled);
    return success(true);
  }),

  http.post(
    `${TAURI_ENDPOINT}/upsert_mcp_server_in_config`,
    async ({ request }) => {
      const { app, id, spec } = await withJson<{
        app: AppId;
        id: string;
        spec: McpServer;
      }>(request);
      upsertMcpServer(app, id, spec);
      return success(true);
    },
  ),

  http.post(
    `${TAURI_ENDPOINT}/delete_mcp_server_in_config`,
    async ({ request }) => {
      const { app, id } = await withJson<{ app: AppId; id: string }>(request);
      deleteMcpServer(app, id);
      return success(true);
    },
  ),

  http.post(`${TAURI_ENDPOINT}/restart_app`, () => success(true)),

  http.post(`${TAURI_ENDPOINT}/get_settings`, () => success(getSettings())),

  http.post(`${TAURI_ENDPOINT}/save_settings`, async ({ request }) => {
    const { settings } = await withJson<{ settings: Settings }>(request);
    setSettings(settings);
    return success(true);
  }),

  http.post(
    `${TAURI_ENDPOINT}/set_app_config_dir_override`,
    async ({ request }) => {
      const { path } = await withJson<{ path: string | null }>(request);
      setAppConfigDirOverrideState(path ?? null);
      return success(true);
    },
  ),

  http.post(`${TAURI_ENDPOINT}/get_app_config_dir_override`, () =>
    success(getAppConfigDirOverride()),
  ),

  http.post(
    `${TAURI_ENDPOINT}/apply_claude_plugin_config`,
    async ({ request }) => {
      const { official } = await withJson<{ official: boolean }>(request);
      setSettings({ enableClaudePluginIntegration: !official });
      return success(true);
    },
  ),

  http.post(`${TAURI_ENDPOINT}/get_config_dir`, async ({ request }) => {
    const { app } = await withJson<{ app: AppId }>(request);
    return success(app === "claude" ? "/default/claude" : "/default/codex");
  }),

  http.post(`${TAURI_ENDPOINT}/is_portable_mode`, () => success(false)),

  http.post(
    `${TAURI_ENDPOINT}/select_config_directory`,
    async ({ request }) => {
      const { defaultPath, default_path } = await withJson<{
        defaultPath?: string;
        default_path?: string;
      }>(request);
      const initial = defaultPath ?? default_path;
      return success(initial ? `${initial}/picked` : "/mock/selected-dir");
    },
  ),

  http.post(`${TAURI_ENDPOINT}/pick_directory`, async ({ request }) => {
    const { defaultPath, default_path } = await withJson<{
      defaultPath?: string;
      default_path?: string;
    }>(request);
    const initial = defaultPath ?? default_path;
    return success(initial ? `${initial}/picked` : "/mock/selected-dir");
  }),

  http.post(`${TAURI_ENDPOINT}/open_file_dialog`, () =>
    success("/mock/import-settings.json"),
  ),

  http.post(
    `${TAURI_ENDPOINT}/import_config_from_file`,
    async ({ request }) => {
      const { filePath } = await withJson<{ filePath: string }>(request);
      if (!filePath) {
        return success({ success: false, message: "Missing file" });
      }
      setSettings({ language: "en" });
      return success({ success: true, backupId: "backup-123" });
    },
  ),

  http.post(`${TAURI_ENDPOINT}/export_config_to_file`, async ({ request }) => {
    const { filePath } = await withJson<{ filePath: string }>(request);
    if (!filePath) {
      return success({ success: false, message: "Invalid destination" });
    }
    return success({ success: true, filePath });
  }),

  http.post(`${TAURI_ENDPOINT}/save_file_dialog`, () =>
    success("/mock/export-settings.json"),
  ),

  // Sync current providers live (no-op success)
  http.post(`${TAURI_ENDPOINT}/sync_current_providers_live`, () =>
    success({ success: true }),
  ),
];