/**
 * Minimal CLI for querying an exported RA3 Mod XML agent snapshot.
 *
 * This is intentionally not installed into PATH. It is meant for scripts,
 * debugging, and as a reference for MCP tool implementations.
 *
 * Usage examples:
 *   node out/agent/cli.js --project D:/Mods/Example status
 *   node out/agent/cli.js --snapshot /path/to/snapshot.json.gz find ExampleUnit
 *   node out/agent/cli.js --project D:/Mods/Example refs ExampleUnit GameObject
 */

import { readSnapshotFile, snapshotPathForProject } from "./snapshot";
import {
  findAssets,
  findDefine,
  findReferenceGroups,
  isFileActive,
  listAssetsByType,
  resolveIncludeSource,
  statusFromSnapshot,
} from "./query";

interface CliOptions {
  snapshotPath: string | null;
  projectDir: string | null;
  command: string;
  args: string[];
}

function parseArgs(argv: string[]): CliOptions {
  const options: CliOptions = {
    snapshotPath: null,
    projectDir: null,
    command: "status",
    args: [],
  };
  const positional: string[] = [];
  for (let i = 0; i < argv.length; i++) {
    const arg = argv[i];
    if (arg === "--snapshot" || arg === "-s") {
      options.snapshotPath = argv[++i] ?? null;
    } else if (arg === "--project" || arg === "-p") {
      options.projectDir = argv[++i] ?? null;
    } else if (arg === "--help" || arg === "-h") {
      options.command = "help";
    } else if (arg.startsWith("-")) {
      // ignore unknown flags
    } else {
      positional.push(arg);
    }
  }
  if (positional.length > 0) {
    options.command = positional[0];
    options.args = positional.slice(1);
  }
  return options;
}

function printHelp(): void {
  console.log(`RA3 Mod XML agent snapshot CLI

Usage:
  node out/agent/cli.js --project <dir> <command> [args...]
  node out/agent/cli.js --snapshot <file> <command> [args...]

Commands:
  status
  find <id> [type]
  refs <id> [type]
  list <type> [prefix]
  active <file>
  define <name>
  resolve <source>
  help
`);
}

async function main(): Promise<void> {
  const options = parseArgs(process.argv.slice(2));
  if (options.command === "help") {
    printHelp();
    return;
  }
  const snapshotPath =
    options.snapshotPath ??
    (options.projectDir ? snapshotPathForProject(options.projectDir) : null);
  if (!snapshotPath) {
    console.error("No --project or --snapshot provided.");
    process.exitCode = 2;
    return;
  }
  const snapshot = await readSnapshotFile(snapshotPath);
  if (!snapshot) {
    console.error(`Snapshot not found or unreadable: ${snapshotPath}`);
    process.exitCode = 3;
    return;
  }

  const [a, b] = options.args;
  switch (options.command) {
    case "status":
      console.log(JSON.stringify(statusFromSnapshot(snapshot), null, 2));
      break;
    case "find":
      if (!a) {
        console.error("find requires an id.");
        process.exitCode = 2;
        return;
      }
      console.log(JSON.stringify(findAssets(snapshot, a, b), null, 2));
      break;
    case "refs":
      if (!a) {
        console.error("refs requires an id.");
        process.exitCode = 2;
        return;
      }
      console.log(JSON.stringify(findReferenceGroups(snapshot, a, b), null, 2));
      break;
    case "list":
      if (!a) {
        console.error("list requires a type.");
        process.exitCode = 2;
        return;
      }
      console.log(JSON.stringify(listAssetsByType(snapshot, a, b ?? ""), null, 2));
      break;
    case "active":
      if (!a) {
        console.error("active requires a file path.");
        process.exitCode = 2;
        return;
      }
      console.log(JSON.stringify({ active: isFileActive(snapshot, a) }, null, 2));
      break;
    case "define":
      if (!a) {
        console.error("define requires a name.");
        process.exitCode = 2;
        return;
      }
      console.log(JSON.stringify(findDefine(snapshot, a), null, 2));
      break;
    case "resolve":
      if (!a) {
        console.error("resolve requires a source.");
        process.exitCode = 2;
        return;
      }
      console.log(JSON.stringify(resolveIncludeSource(snapshot, a), null, 2));
      break;
    default:
      console.error(`Unknown command: ${options.command}`);
      process.exitCode = 2;
  }
}

void main();