import assert from "node:assert/strict";
import test from "node:test";
import { TaskState } from "../src/state.ts";
import { registerTaskTools } from "../src/tools.ts";

function registeredTools(state = new TaskState()) {
  const tools = new Map<string, any>();
  let changes = 0;
  const pi = {
    registerTool(tool: any) {
      tools.set(tool.name, tool);
    },
  };
  registerTaskTools(pi as never, state, () => {
    changes += 1;
  });
  return { tools, state, changes: () => changes };
}

async function execute(tool: any, params: unknown) {
  return tool.execute("call", params, undefined, undefined, {});
}

test("registers the five requested tools with minimal top-level parameters", () => {
  const { tools } = registeredTools();
  assert.deepEqual([...tools.keys()], ["add_task", "update_task", "rm_task", "list_task", "get_task"]);
  assert.deepEqual(Object.keys(tools.get("add_task").parameters.properties), ["tasks"]);
  assert.deepEqual(Object.keys(tools.get("update_task").parameters.properties), ["tasks"]);
  assert.deepEqual(Object.keys(tools.get("rm_task").parameters.properties), ["ids"]);
  assert.deepEqual(Object.keys(tools.get("list_task").parameters.properties), []);
  assert.deepEqual(Object.keys(tools.get("get_task").parameters.properties), ["ids"]);
});

test("mutations return compact content and complete persistence snapshots", async () => {
  const harness = registeredTools();
  const result = await execute(harness.tools.get("add_task"), {
    tasks: [{ name: "Parent", description: "Parent", children: [{ name: "Child", description: "Child" }] }],
  });

  assert.equal(result.content[0].text, "Added 2 tasks: 1, 2. 0/2 done.");
  assert.equal(result.details.snapshot.tasks.length, 2);
  assert.equal(result.details.snapshot.nextId, 3);
  assert.equal(harness.changes(), 1);
});

test("tool validation errors are summarized while preserving atomic state", async () => {
  const harness = registeredTools();
  await execute(harness.tools.get("add_task"), {
    tasks: [{ name: "Parent", description: "Parent", children: [{ name: "Child", description: "Child" }] }],
  });
  const before = harness.state.snapshot();

  await assert.rejects(
    execute(harness.tools.get("update_task"), { tasks: [{ id: 1, parentId: 2 }] }),
    /Update failed · 1 validation error\n- task [12]: parentId creates a cycle/,
  );
  assert.deepEqual(harness.state.snapshot(), before);
  assert.equal(harness.changes(), 1);
});

test("list is compact and get returns full JSON for multiple IDs", async () => {
  const harness = registeredTools();
  await execute(harness.tools.get("add_task"), {
    tasks: [{ name: "Parent", description: "Detailed", children: [{ name: "Child", description: "Child detail" }] }],
  });

  const list = await execute(harness.tools.get("list_task"), {});
  assert.equal(list.content[0].text, "1 [pending] Parent\n└─ 2 [pending] Child");

  const get = await execute(harness.tools.get("get_task"), { ids: [1, 2] });
  const parsed = JSON.parse(get.content[0].text);
  assert.equal(parsed[0].description, "Detailed");
  assert.deepEqual(parsed[0].childrenIds, [2]);
  assert.equal(parsed[1].parentId, 1);
});