/**
 * omniroute setup-codex — Remote-aware Codex CLI profile generator.
 *
 * Connects to a running OmniRoute instance (local or remote VPS), fetches the
 * live model catalog via GET /v1/models, then generates ~/.codex/<name>.config.toml
 * profile files for each model — so you can switch providers with a single flag
 * (`codex --profile glm52`) without editing config files by hand.
 *
 * Primary use-case: configure a local Codex CLI to use models from a VPS.
 *   omniroute setup-codex --remote http://100.67.86.91:20128 --api-key sk-xxx
 *
 * The command is idempotent: re-running updates existing profile files in place.
 */

import { existsSync, mkdirSync, writeFileSync } from "node:fs";
import { join } from "node:path";
import os from "node:os";
import { printHeading, printInfo, printSuccess, printError } from "../io.mjs";
import { t } from "../i18n.mjs";

// ── Model categorisation ──────────────────────────────────────────────────────

/**
 * Map a model ID (as returned by /v1/models) to a Codex profile configuration.
 * Returns null for models that should not get their own profile (e.g. aliases).
 *
 * Exported so the Claude Code profile generator (`setup-claude`) reuses the SAME
 * profile names (glm52, kimi-k27, …) for cross-CLI consistency.
 *
 * @param {string} modelId
 * @returns {{ name:string, ctx:number, compact:number, effort?:string, summary?:boolean, toolLimit:number }|null}
 */
export function categoriseModel(modelId) {
  const id = modelId.toLowerCase();

  // ── Thinking models (max effort, detailed summary) ────────────────────────
  const thinkingPatterns = [
    { re: /kmc\/kimi-k2\.7/, name: "kimi-k27", ctx: 131072, compact: 112000, toolLimit: 32768 },
    { re: /kmc\/kimi-k2\.6/, name: "kimi-k26", ctx: 131072, compact: 112000, toolLimit: 32768 },
    { re: /glm\/glm-5\.2-max/, name: "glm52max", ctx: 131072, compact: 112000, toolLimit: 32768 },
    { re: /glm\/glm-5\.2$/, name: "glm52", ctx: 131072, compact: 112000, toolLimit: 32768 },
    { re: /opencode-go\/mimo-v2\.5-pro/, name: "mimo-pro", ctx: 131072, compact: 112000, toolLimit: 32768 },
    { re: /opencode-go\/qwen3\.7-plus/, name: "qwen37plus", ctx: 32768, compact: 28000, toolLimit: 16384 },
  ];

  // ── Good models (high effort) ─────────────────────────────────────────────
  const goodPatterns = [
    { re: /ollamacloud\/deepseek-v4-pro/, name: "deepseek-pro", ctx: 131072, compact: 112000, toolLimit: 32768 },
    { re: /opencode-go\/mimo-v2\.5$/, name: "mimo", ctx: 131072, compact: 112000, toolLimit: 32768 },
  ];

  // ── Simple models (no effort) ─────────────────────────────────────────────
  const simplePatterns = [
    { re: /ollamacloud\/gemma4:31b/, name: "gemma4", ctx: 32768, compact: 28000, toolLimit: 16384 },
    { re: /ollamacloud\/nemotron-3-super/, name: "nemotron", ctx: 32768, compact: 28000, toolLimit: 16384 },
    { re: /ollamacloud\/gpt-oss:20b/, name: "gptoss", ctx: 32768, compact: 28000, toolLimit: 16384 },
  ];

  // ── Fast models (low effort) ──────────────────────────────────────────────
  const fastPatterns = [
    { re: /ollamacloud\/deepseek-v4-flash/, name: "deepseek-flash", ctx: 65536, compact: 56000, toolLimit: 16384 },
    { re: /ollamacloud\/gemini-3-flash/, name: "gemini-flash", ctx: 1000000, compact: 850000, toolLimit: 32768 },
    { re: /glm\/glm-5-turbo/, name: "glm5turbo", ctx: 131072, compact: 112000, toolLimit: 16384 },
    { re: /glm\/glm-4\.7-flash/, name: "glm47flash", ctx: 131072, compact: 112000, toolLimit: 16384 },
  ];

  for (const p of thinkingPatterns) {
    if (p.re.test(id)) return { ...p, effort: "xhigh", summary: true };
  }
  for (const p of goodPatterns) {
    if (p.re.test(id)) return { ...p, effort: "high", summary: false };
  }
  for (const p of simplePatterns) {
    if (p.re.test(id)) return { ...p, effort: undefined, summary: false };
  }
  for (const p of fastPatterns) {
    if (p.re.test(id)) return { ...p, effort: "low", summary: false };
  }

  return null;
}

/** Build the TOML content for a single profile. */
function buildProfileToml(modelId, cfg) {
  const lines = [
    `# codex --profile ${cfg.name}`,
    `# ${modelId}`,
    `model                          = "${modelId}"`,
    `model_provider                 = "omniroute"`,
  ];

  if (cfg.effort) {
    lines.push(`model_reasoning_effort         = "${cfg.effort}"`);
  }
  if (cfg.summary) {
    lines.push(`model_reasoning_summary        = "detailed"`);
  }

  lines.push(
    `model_context_window           = ${cfg.ctx}`,
    `model_auto_compact_token_limit = ${cfg.compact}`,
    `tool_output_token_limit        = ${cfg.toolLimit}`
  );

  return lines.join("\n") + "\n";
}

// ── Command ───────────────────────────────────────────────────────────────────

/**
 * @param {{remote?:string, port?:string, apiKey?:string, codexHome?:string, dryRun?:boolean, only?:string}} opts
 * @returns {Promise<number>}
 */
export async function runSetupCodexCommand(opts = {}) {
  const port = Number(opts.port ?? process.env.PORT ?? 20128) || 20128;
  const baseUrl = (opts.remote ?? `http://localhost:${port}`).replace(/\/v1$/, "");
  const apiKey = opts.apiKey ?? opts["api-key"] ?? process.env.OMNIROUTE_API_KEY ?? "";
  const codexHome = opts.codexHome ?? opts["codex-home"] ?? join(os.homedir(), ".codex");
  const dryRun = Boolean(opts.dryRun ?? opts["dry-run"]);
  const onlyFilter = opts.only ? opts.only.split(",").map((s) => s.trim()) : null;

  printHeading(`OmniRoute → Codex CLI profile generator`);
  printInfo(`Connecting to ${baseUrl} …`);

  // ── Fetch model catalog ───────────────────────────────────────────────────
  let models;
  try {
    const headers = { "Content-Type": "application/json" };
    if (apiKey) headers["Authorization"] = `Bearer ${apiKey}`;

    const res = await fetch(`${baseUrl}/v1/models`, {
      headers,
      signal: AbortSignal.timeout(10000),
    });
    if (!res.ok) throw new Error(`HTTP ${res.status} ${res.statusText}`);
    const body = await res.json();
    models = body.data ?? body.models ?? [];
  } catch (err) {
    printError(`Failed to fetch models: ${err.message}`);
    printInfo(
      "Make sure OmniRoute is running and the --remote URL is correct.\n" +
        "You may also need --api-key if OmniRoute requires authentication."
    );
    return 1;
  }

  printInfo(`Received ${models.length} models from ${baseUrl}`);

  // ── Ensure codex home exists ──────────────────────────────────────────────
  if (!dryRun && !existsSync(codexHome)) {
    mkdirSync(codexHome, { recursive: true });
  }

  // ── Generate profiles ─────────────────────────────────────────────────────
  let written = 0;
  let skipped = 0;

  for (const m of models) {
    const id = typeof m === "string" ? m : (m.id ?? "");
    if (!id) continue;
    if (onlyFilter && !onlyFilter.some((f) => id.includes(f))) continue;

    const cfg = categoriseModel(id);
    if (!cfg) continue;

    const filePath = join(codexHome, `${cfg.name}.config.toml`);
    const content = buildProfileToml(id, cfg);

    if (dryRun) {
      console.log(`\n── [dry-run] ${filePath} ──`);
      console.log(content);
    } else {
      writeFileSync(filePath, content, "utf8");
      printSuccess(`  ✓ ${cfg.name}.config.toml  (${id})`);
    }
    written++;
  }

  skipped = models.length - written;

  if (!dryRun) {
    console.log("");
    printSuccess(`${written} profiles written to ${codexHome}`);
    if (skipped > 0) {
      printInfo(`${skipped} models skipped (no matching profile pattern)`);
    }
    console.log("\nTo use a profile:");
    console.log("  codex --profile <name>    # e.g. codex --profile glm52");
    console.log("  codex -p <name>           # short form");
  } else {
    console.log(`\n[dry-run] ${written} profiles would be written (${skipped} skipped)`);
  }

  return 0;
}

export function registerSetupCodex(program) {
  program
    .command("setup-codex")
    .description(
      "Fetch the live model catalog from OmniRoute (local or remote VPS) and generate " +
        "~/.codex/<name>.config.toml profiles for each supported model"
    )
    .option("--port <port>", "Local OmniRoute port (ignored when --remote is set)", "20128")
    .option(
      "--remote <url>",
      "Remote OmniRoute URL, e.g. http://100.67.86.91:20128 — fetches models from there"
    )
    .option(
      "--api-key <key>",
      "OmniRoute API key for the remote instance (defaults to OMNIROUTE_API_KEY env var)"
    )
    .option(
      "--codex-home <dir>",
      "Directory where profile files are written (default: ~/.codex)"
    )
    .option(
      "--only <patterns>",
      "Comma-separated substrings — only generate profiles for matching model IDs (e.g. glm,kimi)"
    )
    .option("--dry-run", "Print what would be written without touching the filesystem")
    .action(async (opts) => {
      const exitCode = await runSetupCodexCommand(opts);
      if (exitCode !== 0) process.exit(exitCode);
    });
}