// SPDX-License-Identifier: MIT
pragma solidity 0.8.35;

import {Test} from "forge-std/Test.sol";
import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";
import {MockUSDC} from "../src/MockUSDC.sol";

contract MockUSDCTest is Test {
    MockUSDC internal token;
    address internal constant STRANGER = address(0xBEEF);
    address internal constant RECIPIENT = address(0xCAFE);
    address internal constant SPENDER = address(0xD00D);

    function setUp() public {
        token = new MockUSDC(address(this));
    }

    function testMetadataUsesSixDecimalMockUSDC() public view {
        assertEq(token.name(), "Mock USD Coin");
        assertEq(token.symbol(), "mUSDC");
        assertEq(token.decimals(), 6);
    }

    function testInitialSupplyIsZero() public view {
        assertEq(token.totalSupply(), 0);
    }

    function testMintMintsToRecipientWhenCalledByOwner() public {
        token.mint(RECIPIENT, 1_250_000);

        assertEq(token.totalSupply(), 1_250_000);
        assertEq(token.balanceOf(RECIPIENT), 1_250_000);
    }

    function testMintRevertsWhenCalledByNonOwner() public {
        vm.prank(STRANGER);
        vm.expectRevert(abi.encodeWithSelector(Ownable.OwnableUnauthorizedAccount.selector, STRANGER));
        token.mint(RECIPIENT, 1);
    }

    function testTransferMovesMintedBalance() public {
        token.mint(address(this), 1_250_000);

        token.transfer(RECIPIENT, 250_000);

        assertEq(token.balanceOf(address(this)), 1_000_000);
        assertEq(token.balanceOf(RECIPIENT), 250_000);
    }

    function testApproveSetsAllowanceForSpender() public {
        token.approve(SPENDER, 750_000);

        assertEq(token.allowance(address(this), SPENDER), 750_000);
    }

    function testConstructorRevertsForZeroInitialOwner() public {
        vm.expectRevert(abi.encodeWithSelector(Ownable.OwnableInvalidOwner.selector, address(0)));
        new MockUSDC(address(0));
    }
}