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 five focused tools without the old add_task alias", () => {
  const { tools } = registeredTools();
  assert.deepEqual([...tools.keys()], ["set_tasks", "update_task", "rm_task", "list_task", "get_task"]);
  assert.deepEqual(Object.keys(tools.get("set_tasks").parameters.properties), ["mode", "tasks", "force"]);
  assert.deepEqual(Object.keys(tools.get("update_task").parameters.properties), ["tasks"]);
  assert.deepEqual(Object.keys(tools.get("rm_task").parameters.properties), ["ids", "reason"]);
  assert.deepEqual(Object.keys(tools.get("list_task").parameters.properties), []);
  assert.deepEqual(Object.keys(tools.get("get_task").parameters.properties), ["ids"]);
});

test("set_tasks appends optional-description tasks and persists a complete snapshot", async () => {
  const harness = registeredTools();
  const result = await execute(harness.tools.get("set_tasks"), {
    mode: "append",
    tasks: [{ name: "Parent", children: [{ name: "Child", description: "Useful detail" }] }],
  });

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

test("set_tasks atomically replaces or clears the tree and resets IDs", async () => {
  const harness = registeredTools();
  await execute(harness.tools.get("set_tasks"), {
    mode: "append",
    tasks: [{ name: "Old", status: "done" }],
  });

  const replaced = await execute(harness.tools.get("set_tasks"), {
    mode: "replace",
    tasks: [{ name: "New", status: "in-progress" }],
  });
  assert.equal(replaced.content[0].text, "Replaced task tree with 1 task. 0/1 done. Task IDs restart at 1.");
  assert.deepEqual(harness.state.list().map((task) => [task.id, task.name]), [[1, "New"]]);

  const cleared = await execute(harness.tools.get("set_tasks"), {
    mode: "replace",
    tasks: [],
    force: true,
  });
  assert.equal(cleared.content[0].text, "Cleared task tree. Task IDs reset to 1.");
  assert.deepEqual(harness.state.snapshot(), { tasks: [], nextId: 1 });
});

test("tool validation errors preserve atomic state", async () => {
  const harness = registeredTools();
  await execute(harness.tools.get("set_tasks"), {
    mode: "append",
    tasks: [{ name: "Parent", children: [{ name: "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("rm_task requires and reports a constrained removal reason", async () => {
  const harness = registeredTools();
  await execute(harness.tools.get("set_tasks"), {
    mode: "append",
    tasks: [{ name: "Duplicate" }],
  });
  const removed = await execute(harness.tools.get("rm_task"), { ids: [1], reason: "duplicate" });
  assert.match(removed.content[0].text, /Reason: duplicate\.$/);
  assert.deepEqual(harness.state.list(), []);
});

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

  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].description, undefined);
  assert.equal(parsed[1].parentId, 1);
});