import path from "node:path";
import { loadRouters } from "./core/router-loader.js";
import { initRuleStore } from "./core/rule-store.js";
import { registerBeforePromptBuild } from "./hooks/before-prompt-build.js";
import { registerPromptRulesTool } from "./tools/prompt-rules.js";

interface PluginConfig {
  routersDir?: string;
  rulesFile?: string;
}

interface OpenClawPluginApi {
  logger: {
    info(msg: string): void;
    warn(msg: string): void;
    error(msg: string): void;
  };
  on(hook: string, handler: (...args: any[]) => any): void;
  registerTool(def: any): void;
  config?: PluginConfig;
}

const _G = globalThis as Record<string, unknown>;
const LIFECYCLE_KEY = "_prismFacetGatewayLifecycleRegistered";

function normalizeConfig(api: OpenClawPluginApi): PluginConfig {
  const raw = (api as any).config ?? {};
  return {
    routersDir: typeof raw.routersDir === "string" ? raw.routersDir : undefined,
    rulesFile: typeof raw.rulesFile === "string" ? raw.rulesFile : undefined,
  };
}

export default {
  id: "prism-facet",
  name: "PrismFacet",

  register(api: OpenClawPluginApi) {
    const config = normalizeConfig(api);
    const pluginDir = path.dirname(new URL(import.meta.url).pathname);
    const routersDir = config.routersDir || path.resolve(pluginDir, "..", "routers");
    const rulesFile = config.rulesFile || path.resolve(pluginDir, "..", "rules.json");

    // Gateway lifecycle: init once
    if (!_G[LIFECYCLE_KEY]) {
      _G[LIFECYCLE_KEY] = true;

      initRuleStore(rulesFile);
      loadRouters(routersDir, api.logger).catch((err) => {
        api.logger.error(`[prism-facet] failed to load routers: ${String(err)}`);
      });

      api.on("gateway_stop", () => {
        _G[LIFECYCLE_KEY] = false;
      });
    }

    // Agent session hooks: register every time (dedup inside handler)
    registerBeforePromptBuild(api);

    // Tools
    registerPromptRulesTool(api, routersDir);

    api.logger.info("[prism-facet] plugin registered");
  },
};