#!/usr/bin/env bun
/**
 * Zesdex CLI — main entry point.
 * Mirrors `apps/gateway/src/main.rs`.
 *
 * Parses argv, sets up file logging, and dispatches to the requested mode.
 * Default mode runs the single-process REPL loop.
 */
import * as fs from "node:fs";
import * as os from "node:os";
import * as path from "node:path";
import { parseCli, modeCount } from "./args.ts";
import { runSingleProcess } from "./compose.ts";

/** Initialise file logging (append to <data-dir>/zesdex/zesdex.log). */
function initLogging(): void {
  const dataDir = os.homedir();
  const logDir = path.join(dataDir, ".local", "share", "zesdex");
  fs.mkdirSync(logDir, { recursive: true });
  const logPath = path.join(logDir, "zesdex.log");
  const stream = fs.createWriteStream(logPath, { flags: "a" });
  const originalLog = console.log;
  const originalError = console.error;
  const originalWarn = console.warn;
  const originalInfo = console.info;

  const write = (level: string, args: unknown[]) => {
    const line = `[${new Date().toISOString()}] ${level} ${args
      .map((a) => (typeof a === "string" ? a : JSON.stringify(a)))
      .join(" ")}`;
    stream.write(line + "\n");
    if (level === "ERROR") originalError(...args);
    else if (level === "WARN") originalWarn(...args);
    else if (level === "INFO") originalInfo(...args);
    else originalLog(...args);
  };

  console.log = (...a: unknown[]) => write("LOG", a);
  console.info = (...a: unknown[]) => write("INFO", a);
  console.warn = (...a: unknown[]) => write("WARN", a);
  console.error = (...a: unknown[]) => write("ERROR", a);
}

/** Run the REPL loop (default single-process mode). */
async function runRepl(): Promise<void> {
  const runtime = await runSingleProcess();
  console.info("zesdex ready — single-process REPL mode. Type `exit` to quit.");

  // Minimal REPL over stdin.
  // Use node readline.
  const readline = (await import("node:readline")).default;
  const rl = readline.createInterface({ input: process.stdin, output: process.stdout });

  rl.on("line", async (line: string) => {
    const text = line.trim();
    if (text === "exit" || text === "quit" || text === "/exit") {
      rl.close();
      process.exit(0);
    }
    if (text === "" || text.startsWith("/")) {
      if (text === "/help") {
        console.log("Commands: type a message to talk to the agent; `exit` to quit.");
      }
      return;
    }

    const events: import("@zesdex/domain").TurnEvent[] = [];
    const abort = new AbortController();
    const params = buildTurnParamsFrom(runtime, text, events, abort);

    process.stdout.write("…");
    try {
      await runtime.turnService.runTurn(params);
      // Print the final assistant content from events.
      const lastTokens: string[] = [];
      for (const ev of events) {
        if (ev.kind === "stream_token") lastTokens.push(ev.content);
      }
      const full = lastTokens.join("");
      process.stdout.write("\n");
      if (full.trim() !== "") console.log(full.trim());
      else console.log("(no response content)");
    } catch (e) {
      console.error(`turn failed: ${(e as Error).message}`);
    }
    rl.prompt();
  });

  rl.prompt();
}

// Imported lazily to avoid a circular type-only dependency.
import { buildTurnParams } from "./compose.ts";
function buildTurnParamsFrom(
  runtime: Parameters<typeof buildTurnParams>[0],
  text: string,
  events: import("@zesdex/domain").TurnEvent[],
  abort: AbortController,
) {
  return buildTurnParams(runtime, text, events, abort);
}

/** Main entry. */
async function main(): Promise<void> {
  initLogging();

  const args = process.argv.slice(2);
  let parsed;
  try {
    parsed = parseCli(args);
  } catch (e) {
    console.error((e as Error).message);
    process.exit(2);
  }

  if ("help" in parsed) {
    console.log(parsed.text);
    process.exit(0);
  }

  const opts = parsed;
  if (modeCount(opts) > 1) {
    console.error(
      "Cannot specify multiple modes: --daemon, --attach, --api, --ws, --grpc, --web are mutually exclusive",
    );
    process.exit(2);
  }

  if (opts.daemon) {
    console.info("daemon mode not yet wired (Fase 5) — falling back to REPL");
    await runRepl();
  } else if (opts.attach !== null) {
    console.info(`attach mode for session '${opts.attach}' not yet wired (Fase 5)`);
    process.exit(1);
  } else if (opts.api) {
    console.info(`api mode port ${opts.apiPort} not yet wired (Fase 5)`);
    process.exit(1);
  } else if (opts.ws) {
    console.info(`ws mode port ${opts.wsPort} not yet wired (Fase 5)`);
    process.exit(1);
  } else if (opts.grpc) {
    console.info(`grpc mode port ${opts.grpcPort} not yet wired (Fase 5)`);
    process.exit(1);
  } else if (opts.web) {
    console.info(`web mode port ${opts.webPort} not yet wired (Fase 5)`);
    process.exit(1);
  } else {
    // Default: single-process REPL.
    await runRepl();
  }
}

main().catch((e) => {
  console.error(e instanceof Error ? e.message : String(e));
  process.exit(1);
});