import fs from "node:fs";
import path from "node:path";
import { definePluginEntry } from "openclaw/plugin-sdk/plugin-entry";
import type { OpenClawPluginApi } from "openclaw/plugin-sdk/core";
import { normalizePluginConfig } from "./core/types/contractor.js";
import { resolveContractorAgentMetadata } from "./core/contractor/metadata-resolver.js";
import { createBridgeServer } from "./web/server.js";
import { registerCli } from "./commands/register-cli.js";
import type http from "node:http";

// ── GlobalThis state ─────────────────────────────────────────────────────────
// All persistent state lives on globalThis to survive OpenClaw hot-reloads.
// See LESSONS_LEARNED.md items 1, 3, 11.

const _G = globalThis as Record<string, unknown>;
const LIFECYCLE_KEY = "_contractorAgentLifecycleRegistered";
const SERVER_KEY = "_contractorAgentBridgeServer";
/** Key for the live OpenClaw config accessor (getter fn) shared via globalThis. */
const OPENCLAW_CONFIG_KEY = "_contractorOpenClawConfig";

// ── Plugin entry ─────────────────────────────────────────────────────────────

export default definePluginEntry({
  id: "contractor-agent",
  name: "Contractor Agent",
  description: "Turns Claude Code into an OpenClaw-managed contractor agent",
  // OpenClaw requires register() to be synchronous — returning a Promise
  // surfaces as `Error: plugin register must be synchronous` and the plugin
  // ends up in `error` state. We avoid `await` here and instead let the
  // bridge server bind asynchronously, handling EADDRINUSE via the server's
  // `error` event when another gateway/CLI process already owns the port.
  register(api: OpenClawPluginApi): void {
    const config = normalizePluginConfig(api.pluginConfig);

    // Resolve agent metadata for the bridge server's resolveAgent callback.
    // We do this by reading openclaw.json — the bridge server calls this on every turn.
    function resolveAgent(agentId: string, _sessionKey: string) {
      try {
        const configPath = path.join(
          (process.env.HOME ?? "/root"),
          ".openclaw",
          "openclaw.json",
        );
        const raw = JSON.parse(fs.readFileSync(configPath, "utf8")) as {
          agents?: { list?: Array<{ id: string; workspace?: string; model?: string }> };
        };
        const agent = raw.agents?.list?.find((a) => a.id === agentId);
        if (!agent) return null;
        const meta = resolveContractorAgentMetadata(agent, config.permissionMode);
        if (!meta) return null;
        return { workspace: meta.workspace };
      } catch {
        return null;
      }
    }

    // ── Gateway lifecycle (start bridge server once per gateway process) ──────
    // Always update the config accessor so hot-reloads get fresh config.
    // server.ts reads this via globalThis to build tool execution context.
    _G[OPENCLAW_CONFIG_KEY] = api.config;

    if (!_G[LIFECYCLE_KEY]) {
      _G[LIFECYCLE_KEY] = true;

      // Bind the bridge server only when the gateway boots, NOT eagerly at
      // register-time. register() also runs in one-shot CLI subprocesses
      // (e.g. `openclaw completion`, `openclaw doctor`); spawning a long-
      // lived listener there would prevent those commands from exiting.
      api.on("gateway_start", () => {
        const server = createBridgeServer({
          port: config.bridgePort,
          apiKey: config.bridgeApiKey,
          permissionMode: config.permissionMode,
          resolveAgent,
          logger: api.logger,
        });

        // EADDRINUSE → another gateway already owns the port; fine, skip bind.
        server.on("error", (err: NodeJS.ErrnoException) => {
          if (err.code === "EADDRINUSE") {
            api.logger.info(
              `[contractor-agent] bridge already running on port ${config.bridgePort}, skipping bind`,
            );
            return;
          }
          api.logger.warn(`[contractor-agent] bridge server error: ${err.message ?? String(err)}`);
        });

        // Defense in depth: even if this code path is somehow reached outside
        // the gateway, .unref() prevents the listener from pinning the host's
        // event loop and blocking process exit.
        server.unref();

        _G[SERVER_KEY] = server;
      });

      api.on("gateway_stop", () => {
        const s = _G[SERVER_KEY] as http.Server | undefined;
        if (s) s.close();
        api.logger.info("[contractor-agent] bridge server stopped");
      });
    }

    // ── CLI ───────────────────────────────────────────────────────────────────
    registerCli(api);

    api.logger.info(`[contractor-agent] plugin registered (bridge port: ${config.bridgePort})`);
  },
});