import * as http from "node:http";
import { readExpectedToken, requireBearer } from "./auth.js";
import { readJsonBody } from "./httpUtil.js";

const HOST = process.env.ORCHESTRATOR_HOST ?? "127.0.0.1";
const PORT = Number(process.env.ORCHESTRATOR_PORT ?? "37145");

type RouteTarget = "ollama" | "anythingllm" | "service" | "ia_dev";

type Resolution = {
  resolved: boolean;
  target?: RouteTarget;
  action?: string;
  upstream?: { method: string; url: string; headersHint: string[] };
  reason?: string;
};

const ollamaBase = (): string =>
  (process.env.OLLAMA_URL ?? "http://127.0.0.1:11434").replace(/\/+$/, "");

const anythingLlmBase = (): string =>
  (process.env.ANYTHINGLLM_BASE_URL ?? "").replace(/\/+$/, "");

const reposDevtoolsUrl = (): string =>
  (process.env.REPOS_DEVTOOLS_URL ?? "http://127.0.0.1:37140").replace(/\/+$/, "");

const regexSearchUrl = (): string =>
  (process.env.REGEX_SEARCH_URL ?? "http://127.0.0.1:37143").replace(/\/+$/, "");

const langextractUrl = (): string =>
  (process.env.LANGEXTRACT_URL ?? "http://127.0.0.1:37141").replace(/\/+$/, "");

const localOfficeUrl = (): string =>
  (process.env.LOCAL_OFFICE_URL ?? "http://127.0.0.1:8000").replace(/\/+$/, "");

const iaDevGatewayUrl = (): string =>
  (process.env.IA_DEV_GATEWAY_URL ?? "http://127.0.0.1:37144").replace(/\/+$/, "");

const toolsBridgeUrl = (): string =>
  (process.env.TOOLS_BRIDGE_URL ?? "http://127.0.0.1:37147").replace(/\/+$/, "");

const resolveIntent = (intent: string): Resolution => {
  switch (intent) {
    case "code.complete":
    case "chat.local":
      return {
        resolved: true,
        target: "ollama",
        action: "generate",
        upstream: { method: "POST", url: `${ollamaBase()}/api/generate`, headersHint: ["Content-Type"] },
      };
    case "rag.query":
      return {
        resolved: true,
        target: "anythingllm",
        action: "workspace_chat",
        upstream: {
          method: "POST",
          url: anythingLlmBase()
            ? `${anythingLlmBase()}/api/v1/workspace/...`
            : "configure ANYTHINGLLM_BASE_URL",
          headersHint: ["Authorization", "Content-Type"],
        },
      };
    case "git.clone":
      return {
        resolved: true,
        target: "service",
        action: "repos_clone",
        upstream: { method: "POST", url: `${reposDevtoolsUrl()}/repos-clone`, headersHint: ["Authorization", "Content-Type"] },
      };
    case "search.regex":
      return {
        resolved: true,
        target: "service",
        action: "regex_search",
        upstream: { method: "POST", url: `${regexSearchUrl()}/search`, headersHint: ["Authorization", "Content-Type"] },
      };
    case "extract.entities":
      return {
        resolved: true,
        target: "service",
        action: "langextract",
        upstream: { method: "POST", url: `${langextractUrl()}/extract`, headersHint: ["Authorization", "Content-Type"] },
      };
    case "doc.office.upload":
      return {
        resolved: true,
        target: "service",
        action: "local_office_documents",
        upstream: { method: "POST", url: `${localOfficeUrl()}/documents`, headersHint: ["X-API-Key", "Content-Type"] },
      };
    case "agent.run":
      return {
        resolved: true,
        target: "ia_dev",
        action: "post_run",
        upstream: { method: "POST", url: `${iaDevGatewayUrl()}/v1/runs`, headersHint: ["Authorization", "Content-Type"] },
      };
    case "tools.registry":
      return {
        resolved: true,
        target: "service",
        action: "tools_bridge_registry",
        upstream: {
          method: "GET",
          url: `${toolsBridgeUrl()}/v1/registry`,
          headersHint: ["Authorization"],
        },
      };
    case "tools.carbonyl.plan":
      return {
        resolved: true,
        target: "service",
        action: "tools_carbonyl_open_plan",
        upstream: {
          method: "POST",
          url: `${toolsBridgeUrl()}/v1/carbonyl/open-plan`,
          headersHint: ["Authorization", "Content-Type"],
        },
      };
    case "tools.pageindex.run":
      return {
        resolved: true,
        target: "service",
        action: "tools_pageindex_run",
        upstream: {
          method: "POST",
          url: `${toolsBridgeUrl()}/v1/pageindex/run`,
          headersHint: ["Authorization", "Content-Type"],
        },
      };
    case "tools.chandra.ocr":
      return {
        resolved: true,
        target: "service",
        action: "tools_chandra_ocr",
        upstream: {
          method: "POST",
          url: `${toolsBridgeUrl()}/v1/chandra/ocr`,
          headersHint: ["Authorization", "Content-Type"],
        },
      };
    default:
      return { resolved: false, reason: `Unknown intent: ${intent}` };
  }
};

const json = (res: http.ServerResponse, status: number, body: unknown): void => {
  res.writeHead(status, { "Content-Type": "application/json; charset=utf-8" });
  res.end(JSON.stringify(body));
};

const isRecord = (v: unknown): v is Record<string, unknown> =>
  typeof v === "object" && v !== null && !Array.isArray(v);

const timeline: { at: string; type: string; summary: string; runId?: string; projectId?: string }[] = [];

const main = (): void => {
  const token = readExpectedToken();
  if (token.length === 0) {
    console.error("smart-ide-orchestrator: set ORCHESTRATOR_TOKEN (non-empty secret).");
    process.exit(1);
  }

  const server = http.createServer((req, res) => {
    void (async () => {
      try {
        const url = new URL(req.url ?? "/", `http://${HOST}`);
        const p = url.pathname;

        if (req.method === "GET" && (p === "/health" || p === "/health/")) {
          json(res, 200, { status: "ok" });
          return;
        }

        if (req.method === "GET" && p === "/v1/timeline") {
          if (!requireBearer(req, res, token)) {
            return;
          }
          json(res, 200, { items: timeline.slice(-100) });
          return;
        }

        if (req.method === "POST" && p === "/v1/route") {
          if (!requireBearer(req, res, token)) {
            return;
          }
          const body = await readJsonBody(req);
          if (!isRecord(body) || typeof body.intent !== "string") {
            json(res, 422, { error: "Missing intent (string)" });
            return;
          }
          const dryRun = body.dryRun === true;
          const r = resolveIntent(body.intent);
          if (!r.resolved) {
            json(res, 200, { resolved: false, reason: r.reason });
            return;
          }
          if (dryRun) {
            json(res, 200, {
              resolved: true,
              target: r.target,
              action: r.action,
              upstream: r.upstream,
            });
            return;
          }
          json(res, 200, {
            resolved: true,
            target: r.target,
            action: r.action,
            upstream: r.upstream,
            note: "Use POST /v1/execute to forward (stub)",
          });
          return;
        }

        if (req.method === "POST" && p === "/v1/execute") {
          if (!requireBearer(req, res, token)) {
            return;
          }
          const body = await readJsonBody(req);
          if (!isRecord(body) || typeof body.intent !== "string") {
            json(res, 422, { error: "Missing intent (string)" });
            return;
          }
          const r = resolveIntent(body.intent);
          if (!r.resolved) {
            json(res, 422, { error: r.reason });
            return;
          }
          timeline.push({
            at: new Date().toISOString(),
            type: "execute",
            summary: `${body.intent} -> ${r.target}/${r.action}`,
            projectId: typeof body.projectId === "string" ? body.projectId : undefined,
          });
          json(res, 200, {
            ok: true,
            forwarded: false,
            message:
              "Stub: call upstream yourself or extend orchestrator with fetch() and service tokens.",
            resolution: r,
          });
          return;
        }

        json(res, 404, { error: "Not found" });
      } catch (e) {
        const msg = e instanceof Error ? e.message : String(e);
        json(res, 400, { error: msg });
      }
    })();
  });

  server.listen(PORT, HOST, () => {
    console.error(`smart-ide-orchestrator listening on http://${HOST}:${PORT}`);
  });
};

main();