import { spawn } from "node:child_process";
import { t } from "../i18n.mjs";
import { resolveActiveContext } from "../contexts.mjs";

/** OpenAI/Codex env keys stripped from the child so a stale OpenAI key/base-url
 *  in the shell can't shadow the omniroute provider (defense-in-depth). Mirrors
 *  free-claude-code's codex adapter. NOTE: this does NOT silence codex's
 *  `refresh_token` log noise — that comes from a stored OpenAI session in
 *  ~/.codex/auth.json, not the env; it is cosmetic and does not block requests. */
const STRIPPED_CODEX_ENV_KEYS = [
  "OPENAI_API_KEY",
  "OPENAI_BASE_URL",
  "OPENAI_API_BASE",
  "OPENAI_ORG_ID",
  "OPENAI_ORGANIZATION",
  "CODEX_API_KEY",
];

/** Placeholder so codex's `env_key` is always satisfied when the backend is open. */
const NO_AUTH_SENTINEL = "omniroute-no-auth";

// On Windows the `codex` binary is an npm `.cmd` shim that `spawn` cannot resolve
// without a shell (bare "codex" → ENOENT). Mirror the qodercli Windows fix (#6263):
// spawn `codex.cmd` through a shell on win32, and the bare binary elsewhere.
export function resolveCodexSpawn(platform) {
  if (platform === "win32") {
    return { command: "codex.cmd", shell: true };
  }
  return { command: "codex", shell: undefined };
}

function stripTrailingSlash(value) {
  let s = String(value);
  let end = s.length;
  while (end > 0 && s.charCodeAt(end - 1) === 47) end--;
  return end === s.length ? s : s.slice(0, end);
}

/** TOML assignment for a `-c key=value` codex flag (strings get quoted). */
function tomlAssign(key, value) {
  if (typeof value === "boolean" || typeof value === "number") return `${key}=${value}`;
  return `${key}=${JSON.stringify(String(value))}`;
}

/**
 * Resolve the OmniRoute root base URL + auth for codex, honouring (in order):
 * explicit flags → active context (remote mode) → localhost:<port>.
 * @returns {{ baseUrl:string, authToken:string|undefined }}
 */
export function resolveCodexTarget(opts = {}) {
  const explicit = opts.remote ?? opts.baseUrl;
  let baseUrl;
  if (explicit) {
    baseUrl = stripTrailingSlash(explicit).replace(/\/v1$/, "");
  } else {
    let fromCtx;
    try {
      fromCtx = resolveActiveContext(opts.context ?? process.env.OMNIROUTE_CONTEXT)?.baseUrl;
    } catch {
      /* no context */
    }
    baseUrl = fromCtx
      ? stripTrailingSlash(fromCtx).replace(/\/v1$/, "")
      : `http://localhost:${Number(opts.port ?? process.env.PORT ?? 20128) || 20128}`;
  }

  let authToken = opts.apiKey ?? opts["api-key"];
  if (!authToken) {
    try {
      const ctx = resolveActiveContext(opts.context ?? process.env.OMNIROUTE_CONTEXT);
      authToken = ctx?.accessToken || ctx?.apiKey || undefined;
    } catch {
      /* no context auth */
    }
  }
  if (!authToken) authToken = process.env.OMNIROUTE_API_KEY;
  return { baseUrl, authToken };
}

/** Health-check an OmniRoute root URL before launching Codex. */
async function healthCheck(baseUrl, timeoutMs = 3000) {
  try {
    const res = await fetch(`${baseUrl}/api/monitoring/health`, {
      signal: AbortSignal.timeout(timeoutMs),
    });
    return res.ok;
  } catch {
    return false;
  }
}

/**
 * Build the env for the Codex child: strip stale OpenAI/Codex creds, then set
 * OMNIROUTE_API_KEY (the provider env_key) to the resolved token or a sentinel.
 * @param {Record<string,string>} baseEnv
 * @param {string|undefined} authToken
 * @returns {Record<string,string>}
 */
export function buildCodexEnv(baseEnv, authToken) {
  const env = { ...baseEnv };
  for (const key of STRIPPED_CODEX_ENV_KEYS) delete env[key];
  env.OMNIROUTE_API_KEY = (authToken && String(authToken).trim()) || NO_AUTH_SENTINEL;
  return env;
}

/**
 * Codex `-c` flags that define the `omniroute` provider inline, so launch works
 * WITHOUT a pre-existing ~/.codex/config.toml. Mirrors free-claude-code.
 * @param {string} baseUrl  OmniRoute root URL (no /v1)
 * @returns {string[]}
 */
export function buildCodexProviderArgs(baseUrl) {
  return [
    "-c",
    tomlAssign("model_provider", "omniroute"),
    "-c",
    tomlAssign("model_providers.omniroute.name", "OmniRoute"),
    "-c",
    tomlAssign("model_providers.omniroute.base_url", `${baseUrl}/v1`),
    "-c",
    tomlAssign("model_providers.omniroute.env_key", "OMNIROUTE_API_KEY"),
    "-c",
    tomlAssign("model_providers.omniroute.wire_api", "responses"),
    "-c",
    tomlAssign("model_providers.omniroute.requires_openai_auth", false),
  ];
}

/**
 * @param {{port?:string, remote?:string, profile?:string, apiKey?:string}} opts
 * @param {string[]} codexArgs  pass-through args for the codex binary
 * @returns {Promise<number>} exit code
 */
export async function runLaunchCodexCommand(opts = {}, codexArgs = []) {
  const { baseUrl, authToken } = resolveCodexTarget(opts);

  if (!(await healthCheck(baseUrl))) {
    console.error(
      (
        t("launch.notRunning") ||
        "OmniRoute is not reachable at {port}. Start it with 'omniroute serve'."
      ).replace("{port}", baseUrl)
    );
    return 1;
  }

  // Provider injected via -c (works without config.toml); then the profile (model),
  // then the user's pass-through args.
  const providerArgs = buildCodexProviderArgs(baseUrl);
  const profileArgs = opts.profile ? ["--profile", opts.profile] : [];
  const extraArgs = [...providerArgs, ...profileArgs, ...codexArgs];
  const env = buildCodexEnv(process.env, authToken);

  return await new Promise((resolve) => {
    const { command: codexLaunch, shell: shellValue } = resolveCodexSpawn(process.platform);
    const child = spawn(codexLaunch, extraArgs, {
      env,
      stdio: "inherit",
      shell: shellValue,
    });
    child.on("error", (err) => {
      if (err?.code === "ENOENT") {
        console.error(
          "The 'codex' CLI was not found in PATH. Install with:\n  npm install -g @openai/codex"
        );
        resolve(127);
      } else {
        console.error(String(err?.message || err));
        resolve(1);
      }
    });
    child.on("exit", (code) => resolve(code ?? 0));
  });
}

export function registerLaunchCodex(program) {
  program
    .command("launch-codex")
    .description(
      t("launchCodex.description") || "Launch Codex CLI pointed at OmniRoute (local or remote VPS)"
    )
    .option("--port <port>", "Local OmniRoute port (ignored when --remote is set)", "20128")
    .option(
      "--remote <url>",
      "Remote OmniRoute base URL, e.g. http://192.168.0.15:20128 (overrides --port + context)"
    )
    .option("--profile <name>", "Codex profile to activate (passed as --profile <name>)")
    .option("-p, --p <name>", "Alias for --profile")
    .option(
      "--api-key <key>",
      "OmniRoute API key (overrides OMNIROUTE_API_KEY env var for this invocation)"
    )
    .allowUnknownOption(true)
    .allowExcessArguments(true)
    .argument("[codexArgs...]", "arguments passed through to the codex binary")
    .action(async (codexArgs, opts) => {
      const merged = { ...opts, profile: opts.profile ?? opts.p };
      const exitCode = await runLaunchCodexCommand(merged, codexArgs ?? []);
      if (exitCode !== 0) process.exit(exitCode);
    });
}