// Mock server for minimal OpenAI web-search E2E scenarios.
import fs from "node:fs";
import http from "node:http";
import https from "node:https";
import { readTcpPortEnv } from "../env-limits.mjs";
import {
  boundedRequestLogBody,
  isRequestBodyTooLargeError,
  readBody,
  writeRequestLogEntryOrFail,
  writeJson,
  writeSse,
} from "../mock-openai-http.mjs";

const port = readTcpPortEnv("MOCK_PORT");
const requestLog = process.env.MOCK_REQUEST_LOG;
const successMarker = process.env.SUCCESS_MARKER;
const rawSchemaError = process.env.RAW_SCHEMA_ERROR;
const tlsCertPath = process.env.MOCK_TLS_CERT?.trim();
const tlsKeyPath = process.env.MOCK_TLS_KEY?.trim();

if (Boolean(tlsCertPath) !== Boolean(tlsKeyPath)) {
  throw new Error("MOCK_TLS_CERT and MOCK_TLS_KEY must be set together");
}

function writeOpenAiReject(res) {
  writeJson(res, 400, {
    error: {
      message: rawSchemaError.replace(/^400\s+/, ""),
      type: "invalid_request_error",
      code: "invalid_request_error",
    },
  });
}

function hasWebSearchTool(tools) {
  return (
    Array.isArray(tools) &&
    tools.some((tool) => {
      if (!tool || typeof tool !== "object") {
        return false;
      }
      if (tool.type === "web_search") {
        return true;
      }
      if (tool.type === "function" && tool.name === "web_search") {
        return true;
      }
      if (tool.type === "function" && tool.function?.name === "web_search") {
        return true;
      }
      return false;
    })
  );
}

function bodyContainsForceReject(body) {
  return JSON.stringify(body).includes("FORCE_SCHEMA_REJECT");
}

function responseEvents(text) {
  return [
    {
      type: "response.output_item.added",
      item: {
        type: "message",
        id: "msg_schema_e2e_1",
        role: "assistant",
        content: [],
        status: "in_progress",
      },
    },
    {
      type: "response.output_item.done",
      item: {
        type: "message",
        id: "msg_schema_e2e_1",
        role: "assistant",
        status: "completed",
        content: [{ type: "output_text", text, annotations: [] }],
      },
    },
    {
      type: "response.completed",
      response: {
        id: "resp_schema_e2e_1",
        status: "completed",
        usage: {
          input_tokens: 11,
          output_tokens: 7,
          total_tokens: 18,
          input_tokens_details: { cached_tokens: 0 },
        },
      },
    },
  ];
}

const handleRequest = (req, res) => {
  void (async () => {
    const url = new URL(req.url ?? "/", "https://api.openai.com");
    if (req.method === "GET" && url.pathname === "/health") {
      writeJson(res, 200, { ok: true });
      return;
    }
    if (req.method === "GET" && url.pathname === "/v1/models") {
      writeJson(res, 200, {
        object: "list",
        data: [{ id: "gpt-5", object: "model", owned_by: "openclaw-e2e" }],
      });
      return;
    }

    let bodyText;
    try {
      bodyText = await readBody(req);
    } catch (error) {
      if (isRequestBodyTooLargeError(error)) {
        writeJson(res, 413, { error: { message: error.message } });
        return;
      }
      throw error;
    }
    let body;
    try {
      body = bodyText ? JSON.parse(bodyText) : {};
    } catch {
      body = {};
    }
    if (
      writeRequestLogEntryOrFail(res, {
        requestLog,
        required: true,
        label: "mock-openai-web-search",
        entry: {
          method: req.method,
          path: url.pathname,
          body: boundedRequestLogBody(body, bodyText),
        },
      })
    ) {
      return;
    }

    if (req.method === "POST" && url.pathname === "/v1/responses") {
      if (bodyContainsForceReject(body)) {
        writeOpenAiReject(res);
        return;
      }
      if (body?.reasoning?.effort === "minimal" && hasWebSearchTool(body.tools)) {
        writeOpenAiReject(res);
        return;
      }
      writeSse(res, responseEvents(successMarker));
      return;
    }

    writeJson(res, 404, {
      error: { message: `unhandled mock route: ${req.method} ${url.pathname}` },
    });
  })().catch((/** @type {unknown} */ error) => {
    const message = error instanceof Error ? error.message : String(error);
    console.error(`mock-openai-web-search request handler failed: ${message}`);
    if (!res.headersSent) {
      writeJson(res, 500, { error: { message: `mock OpenAI handler failed: ${message}` } });
      return;
    }
    res.destroy(error instanceof Error ? error : new Error(message));
  });
};

const server =
  tlsCertPath && tlsKeyPath
    ? https.createServer(
        {
          cert: fs.readFileSync(tlsCertPath),
          key: fs.readFileSync(tlsKeyPath),
        },
        handleRequest,
      )
    : http.createServer(handleRequest);

server.listen(port, "127.0.0.1", () => {
  console.log(`mock-openai listening on ${port} (${tlsCertPath ? "HTTPS" : "HTTP"})`);
});