import { SignerWithAddress } from "@nomicfoundation/hardhat-ethers/signers";
import { time } from "@nomicfoundation/hardhat-network-helpers";
import { expect } from "chai";
import { ethers } from "hardhat";
import { TaskEscrow } from "../typechain-types";

describe("TaskEscrow", function () {
  let taskEscrow: TaskEscrow;
  let cUSDMock: any;
  let owner: SignerWithAddress;
  let requester: SignerWithAddress;
  let worker: SignerWithAddress;

  const PAYMENT_AMOUNT = ethers.parseEther("10"); // 10 cUSD
  const DURATION_DAYS = 7;

  beforeEach(async function () {
    [owner, requester, worker] = await ethers.getSigners();

    // Deploy mock cUSD token
    const MockERC20 = await ethers.getContractFactory("MockERC20");
    cUSDMock = await MockERC20.deploy("Celo Dollar", "cUSD");
    await cUSDMock.waitForDeployment();

    // Deploy TaskEscrow
    const TaskEscrow = await ethers.getContractFactory("TaskEscrow");
    taskEscrow = await TaskEscrow.deploy(await cUSDMock.getAddress());
    await taskEscrow.waitForDeployment();

    // Mint cUSD to requester
    await cUSDMock.mint(requester.address, ethers.parseEther("1000"));
  });

  describe("Deployment", function () {
    it("Should set the correct owner", async function () {
      expect(await taskEscrow.owner()).to.equal(owner.address);
    });

    it("Should set the correct cUSD address", async function () {
      expect(await taskEscrow.cUSD()).to.equal(await cUSDMock.getAddress());
    });

    it("Should initialize with zero platform fees", async function () {
      expect(await taskEscrow.platformFeesAccumulated()).to.equal(0);
    });
  });

  describe("Create Task", function () {
    it("Should create a task successfully", async function () {
      // Approve and create task
      await cUSDMock
        .connect(requester)
        .approve(await taskEscrow.getAddress(), PAYMENT_AMOUNT);

      await expect(
        taskEscrow.connect(requester).createTask(PAYMENT_AMOUNT, DURATION_DAYS)
      )
        .to.emit(taskEscrow, "TaskCreated")
        .withArgs(
          1,
          requester.address,
          PAYMENT_AMOUNT,
          (await time.latest()) + DURATION_DAYS * 24 * 60 * 60
        );

      const task = await taskEscrow.getTask(1);
      expect(task.requester).to.equal(requester.address);
      expect(task.paymentAmount).to.equal(PAYMENT_AMOUNT);
      expect(task.status).to.equal(0); // Open
    });

    it("Should fail with zero payment amount", async function () {
      await expect(
        taskEscrow.connect(requester).createTask(0, DURATION_DAYS)
      ).to.be.revertedWith("Payment must be > 0");
    });

    it("Should fail with invalid duration", async function () {
      await expect(
        taskEscrow.connect(requester).createTask(PAYMENT_AMOUNT, 0)
      ).to.be.revertedWith("Invalid duration");

      await expect(
        taskEscrow.connect(requester).createTask(PAYMENT_AMOUNT, 91)
      ).to.be.revertedWith("Invalid duration");
    });

    it("Should transfer cUSD to contract", async function () {
      await cUSDMock
        .connect(requester)
        .approve(await taskEscrow.getAddress(), PAYMENT_AMOUNT);
      await taskEscrow
        .connect(requester)
        .createTask(PAYMENT_AMOUNT, DURATION_DAYS);

      expect(await cUSDMock.balanceOf(await taskEscrow.getAddress())).to.equal(
        PAYMENT_AMOUNT
      );
    });
  });

  describe("Assign Worker", function () {
    beforeEach(async function () {
      await cUSDMock
        .connect(requester)
        .approve(await taskEscrow.getAddress(), PAYMENT_AMOUNT);
      await taskEscrow
        .connect(requester)
        .createTask(PAYMENT_AMOUNT, DURATION_DAYS);
    });

    it("Should assign worker successfully", async function () {
      await expect(
        taskEscrow.connect(requester).assignWorker(1, worker.address)
      )
        .to.emit(taskEscrow, "WorkerAssigned")
        .withArgs(1, worker.address);

      const task = await taskEscrow.getTask(1);
      expect(task.worker).to.equal(worker.address);
      expect(task.status).to.equal(1); // InProgress
    });

    it("Should fail if not requester", async function () {
      await expect(
        taskEscrow.connect(worker).assignWorker(1, worker.address)
      ).to.be.revertedWith("Not task requester");
    });

    it("Should fail with invalid worker address", async function () {
      await expect(
        taskEscrow.connect(requester).assignWorker(1, ethers.ZeroAddress)
      ).to.be.revertedWith("Invalid worker address");
    });

    it("Should fail if requester tries to be worker", async function () {
      await expect(
        taskEscrow.connect(requester).assignWorker(1, requester.address)
      ).to.be.revertedWith("Requester cannot be worker");
    });
  });

  describe("Approve Submission", function () {
    beforeEach(async function () {
      await cUSDMock
        .connect(requester)
        .approve(await taskEscrow.getAddress(), PAYMENT_AMOUNT);
      await taskEscrow
        .connect(requester)
        .createTask(PAYMENT_AMOUNT, DURATION_DAYS);
      await taskEscrow.connect(requester).assignWorker(1, worker.address);
    });

    it("Should approve and release payment", async function () {
      const workerBalanceBefore = await cUSDMock.balanceOf(worker.address);

      await taskEscrow.connect(owner).approveSubmission(1);

      const workerBalanceAfter = await cUSDMock.balanceOf(worker.address);
      const expectedWorkerPayment = (PAYMENT_AMOUNT * 9500n) / 10000n; // 95%

      expect(workerBalanceAfter - workerBalanceBefore).to.equal(
        expectedWorkerPayment
      );

      const task = await taskEscrow.getTask(1);
      expect(task.status).to.equal(2); // Completed
    });

    it("Should accumulate platform fees", async function () {
      await taskEscrow.connect(owner).approveSubmission(1);

      const expectedFee = (PAYMENT_AMOUNT * 500n) / 10000n; // 5%
      expect(await taskEscrow.platformFeesAccumulated()).to.equal(expectedFee);
    });

    it("Should fail if not owner", async function () {
      await expect(taskEscrow.connect(requester).approveSubmission(1))
        .to.be.revertedWithCustomError(taskEscrow, "OwnableUnauthorizedAccount")
        .withArgs(requester.address);
    });

    it("Should fail if task not in progress", async function () {
      await taskEscrow.connect(owner).approveSubmission(1);

      await expect(
        taskEscrow.connect(owner).approveSubmission(1)
      ).to.be.revertedWith("Task not in progress");
    });
  });

  describe("Reject Submission", function () {
    beforeEach(async function () {
      await cUSDMock
        .connect(requester)
        .approve(await taskEscrow.getAddress(), PAYMENT_AMOUNT);
      await taskEscrow
        .connect(requester)
        .createTask(PAYMENT_AMOUNT, DURATION_DAYS);
      await taskEscrow.connect(requester).assignWorker(1, worker.address);
    });

    it("Should reject and refund requester", async function () {
      const requesterBalanceBefore = await cUSDMock.balanceOf(
        requester.address
      );

      await taskEscrow.connect(owner).rejectSubmission(1);

      const requesterBalanceAfter = await cUSDMock.balanceOf(requester.address);
      expect(requesterBalanceAfter - requesterBalanceBefore).to.equal(
        PAYMENT_AMOUNT
      );

      const task = await taskEscrow.getTask(1);
      expect(task.status).to.equal(3); // Cancelled
    });

    it("Should fail if not owner", async function () {
      await expect(
        taskEscrow.connect(requester).rejectSubmission(1)
      ).to.be.revertedWithCustomError(taskEscrow, "OwnableUnauthorizedAccount")
  .withArgs(requester.address);
    });
  });

  describe("Cancel Task", function () {
    beforeEach(async function () {
      await cUSDMock
        .connect(requester)
        .approve(await taskEscrow.getAddress(), PAYMENT_AMOUNT);
      await taskEscrow
        .connect(requester)
        .createTask(PAYMENT_AMOUNT, DURATION_DAYS);
    });

    it("Should allow requester to cancel open task", async function () {
      const requesterBalanceBefore = await cUSDMock.balanceOf(
        requester.address
      );

      await taskEscrow.connect(requester).cancelTask(1);

      const requesterBalanceAfter = await cUSDMock.balanceOf(requester.address);
      expect(requesterBalanceAfter - requesterBalanceBefore).to.equal(
        PAYMENT_AMOUNT
      );

      const task = await taskEscrow.getTask(1);
      expect(task.status).to.equal(3); // Cancelled
    });

    it("Should fail if not requester", async function () {
      await expect(taskEscrow.connect(worker).cancelTask(1)).to.be.revertedWith(
        "Not task requester"
      );
    });
  });

  describe("Expired Task", function () {
    beforeEach(async function () {
      await cUSDMock
        .connect(requester)
        .approve(await taskEscrow.getAddress(), PAYMENT_AMOUNT);
      await taskEscrow
        .connect(requester)
        .createTask(PAYMENT_AMOUNT, DURATION_DAYS);
    });

    it("Should allow claiming expired task", async function () {
      // Fast forward time
      await time.increase(DURATION_DAYS * 24 * 60 * 60 + 1);

      const requesterBalanceBefore = await cUSDMock.balanceOf(
        requester.address
      );

      await taskEscrow.connect(requester).claimExpiredTask(1);

      const requesterBalanceAfter = await cUSDMock.balanceOf(requester.address);
      expect(requesterBalanceAfter - requesterBalanceBefore).to.equal(
        PAYMENT_AMOUNT
      );

      const task = await taskEscrow.getTask(1);
      expect(task.status).to.equal(4); // Expired
    });

    it("Should fail if task not expired", async function () {
      await expect(
        taskEscrow.connect(requester).claimExpiredTask(1)
      ).to.be.revertedWith("Task not expired yet");
    });
  });

  describe("Withdraw Platform Fees", function () {
    beforeEach(async function () {
      await cUSDMock
        .connect(requester)
        .approve(await taskEscrow.getAddress(), PAYMENT_AMOUNT);
      await taskEscrow
        .connect(requester)
        .createTask(PAYMENT_AMOUNT, DURATION_DAYS);
      await taskEscrow.connect(requester).assignWorker(1, worker.address);
      await taskEscrow.connect(owner).approveSubmission(1);
    });

    it("Should allow owner to withdraw fees", async function () {
      const ownerBalanceBefore = await cUSDMock.balanceOf(owner.address);
      const expectedFee = (PAYMENT_AMOUNT * 500n) / 10000n;

      await taskEscrow.connect(owner).withdrawPlatformFees();

      const ownerBalanceAfter = await cUSDMock.balanceOf(owner.address);
      expect(ownerBalanceAfter - ownerBalanceBefore).to.equal(expectedFee);
      expect(await taskEscrow.platformFeesAccumulated()).to.equal(0);
    });

    it("Should fail if no fees to withdraw", async function () {
      await taskEscrow.connect(owner).withdrawPlatformFees();

      await expect(
        taskEscrow.connect(owner).withdrawPlatformFees()
      ).to.be.revertedWith("No fees to withdraw");
    });

    it("Should fail if not owner", async function () {
      await expect(
        taskEscrow.connect(requester).withdrawPlatformFees()
      ).to.be.revertedWithCustomError(taskEscrow, "OwnableUnauthorizedAccount")
  .withArgs(requester.address);
    });
  });

  describe("Pause Functionality", function () {
    it("Should allow owner to pause", async function () {
      await taskEscrow.connect(owner).pause();
      expect(await taskEscrow.paused()).to.be.true;
    });

    it("Should prevent task creation when paused", async function () {
      await taskEscrow.connect(owner).pause();

      await cUSDMock
        .connect(requester)
        .approve(await taskEscrow.getAddress(), PAYMENT_AMOUNT);

      await expect(
        taskEscrow.connect(requester).createTask(PAYMENT_AMOUNT, DURATION_DAYS)
      ).to.be.revertedWithCustomError(taskEscrow, "EnforcedPause");
    });

    it("Should allow owner to unpause", async function () {
      await taskEscrow.connect(owner).pause();
      await taskEscrow.connect(owner).unpause();
      expect(await taskEscrow.paused()).to.be.false;
    });
  });
});