import { query } from "@anthropic-ai/claude-agent-sdk";
import { readFileSync } from "fs";
import { resolve } from "path";

// 2-build-one.ts — Single builder agent.
// Reads a spec file, sends it as context, and lets one agent build a layer.
// Generic: swap the spec file to build anything.

const SPEC_PATH = resolve(import.meta.dir, "sample/spec.md");
const REPO_DIR = resolve(import.meta.dir, "../../../multi-agent");

const spec = readFileSync(SPEC_PATH, "utf-8");

const systemPrompt = `You are a domain modeler. Build the domain model layer for the project described in the spec below.

Create all model files: records, enums, value objects with proper validation.
Write unit tests for each model.

After building, run the test command from the spec.
If tests pass: git add -A && git commit -m "feat: add domain models"
If tests fail: fix and retry.

Only create files for the model layer — do not build controllers, repositories, or other layers.

## Spec
${spec}`;

console.log("Single builder agent");
console.log(`  Spec: ${SPEC_PATH}`);
console.log(`  Repo: ${REPO_DIR}\n`);

const q = query({
  prompt:
    "Build the domain model layer as described in your system prompt. Create all model classes with validation, write tests, run them, and commit if green.",
  options: {
    systemPrompt,
    allowedTools: ["Read", "Write", "Edit", "Bash", "Glob", "Grep"],
    maxTurns: 40,
    cwd: REPO_DIR,
    permissionMode: "bypassPermissions",
  },
});

for await (const msg of q) {
  if (msg.type === "assistant" && msg.message) {
    for (const block of msg.message.content) {
      if (block.type === "tool_use") {
        const detail =
          block.input?.file_path ??
          block.input?.command ??
          block.input?.pattern ??
          "";
        const short =
          typeof detail === "string"
            ? detail.slice(0, 100)
            : JSON.stringify(detail).slice(0, 100);
        console.log(`  [MODELS] ${block.name}(${short})`);
      }
    }
  }
  if (msg.type === "result") {
    console.log(
      `\nDone [${msg.subtype}, $${msg.total_cost_usd.toFixed(4)}]`
    );
  }
}