// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import "forge-std/Test.sol";
import "../../contracts/vault/Ledger.sol";
import "../../contracts/vault/RegulatedEntityRegistry.sol";
import "../../contracts/vault/XAUOracle.sol";
import "../../contracts/vault/RateAccrual.sol";
import "../../contracts/oracle/Aggregator.sol";

contract LedgerTest is Test {
    Ledger public ledger;
    RegulatedEntityRegistry public entityRegistry;
    XAUOracle public xauOracle;
    RateAccrual public rateAccrual;
    Aggregator public ethPriceFeed;

    address public admin = address(0x1);
    address public vault = address(0x2);
    address public entity = address(0x3);
    address public eth = address(0); // Native ETH

    uint256 public constant ETH_PRICE_XAU = 0.05e18; // 1 ETH = 0.05 oz XAU (example)

    function setUp() public {
        vm.startPrank(admin);

        // Deploy Regulated Entity Registry
        entityRegistry = new RegulatedEntityRegistry(admin);
        entityRegistry.registerEntity(entity, keccak256("US"), new address[](0));

        // Deploy ETH price feed
        ethPriceFeed = new Aggregator("ETH/XAU", admin, 3600, 50);
        ethPriceFeed.addTransmitter(admin);
        ethPriceFeed.updateAnswer(ETH_PRICE_XAU);

        // Deploy XAU Oracle
        xauOracle = new XAUOracle(admin);
        xauOracle.addPriceFeed(address(ethPriceFeed), 10000); // 100% weight
        xauOracle.updatePrice();

        // Deploy Rate Accrual
        rateAccrual = new RateAccrual(admin);
        rateAccrual.setInterestRate(address(0), 500); // 5% annual
        rateAccrual.setInterestRate(address(0x100), 500); // 5% for test currency

        // Deploy Ledger
        ledger = new Ledger(admin, address(xauOracle), address(rateAccrual));

        // Grant vault role
        ledger.grantVaultRole(vault);

        // Set risk parameters for ETH (Ledger requires liquidationRatio <= 10000)
        ledger.setRiskParameters(
            eth,
            1_000_000e18, // debt ceiling
            9000, // liquidation ratio (90%)
            50000 // credit multiplier (5x)
        );

        vm.stopPrank();
    }

    function test_ModifyCollateral() public {
        vm.prank(vault);
        ledger.modifyCollateral(vault, eth, int256(10e18));

        assertEq(ledger.collateral(vault, eth), 10e18);

        vm.prank(vault);
        ledger.modifyCollateral(vault, eth, -int256(5e18));

        assertEq(ledger.collateral(vault, eth), 5e18);
    }

    function test_ModifyCollateral_RevertIfNotRegistered() public {
        address unregisteredAsset = address(0x999);

        vm.prank(vault);
        vm.expectRevert("Ledger: asset not registered");
        ledger.modifyCollateral(vault, unregisteredAsset, int256(10e18));
    }

    function test_ModifyCollateral_RevertIfInsufficient() public {
        vm.prank(vault);
        ledger.modifyCollateral(vault, eth, int256(10e18));

        vm.prank(vault);
        vm.expectRevert("Ledger: insufficient collateral");
        ledger.modifyCollateral(vault, eth, -int256(20e18));
    }

    function test_ModifyDebt() public {
        address currency = address(0x100);

        vm.prank(vault);
        ledger.modifyDebt(vault, currency, int256(1000e18));

        assertEq(ledger.debt(vault, currency), 1000e18);

        vm.prank(vault);
        ledger.modifyDebt(vault, currency, -int256(500e18));

        assertEq(ledger.debt(vault, currency), 500e18);
    }

    function test_ModifyDebt_AccruesInterest() public {
        address currency = address(0x100);

        vm.prank(vault);
        ledger.modifyDebt(vault, currency, int256(1000e18));

        uint256 accumulator1 = ledger.rateAccumulator(currency);

        // Fast forward time (1 year)
        vm.warp(block.timestamp + 365 days);

        vm.prank(vault);
        ledger.modifyDebt(vault, currency, int256(0)); // Trigger accrual

        uint256 accumulator2 = ledger.rateAccumulator(currency);
        assertGt(accumulator2, accumulator1, "Interest should accrue");
    }

    function test_GetVaultHealth() public {
        // Deposit 10 ETH collateral
        vm.prank(vault);
        ledger.modifyCollateral(vault, eth, int256(10e18));

        // Get health (no debt)
        (uint256 healthRatio, uint256 collateralValue, uint256 debtValue) = ledger.getVaultHealth(vault);

        assertEq(debtValue, 0);
        assertGt(collateralValue, 0);
        assertEq(healthRatio, type(uint256).max, "No debt = infinite health");
    }

    function test_CanBorrow() public {
        address currency = address(0x100);

        // Set risk parameters for currency (requires PARAM_MANAGER_ROLE)
        vm.prank(admin);
        ledger.setRiskParameters(currency, 1_000_000e18, 9000, 50000);

        // Deposit 10 ETH collateral (worth 0.5 oz XAU at 0.05 ETH/XAU)
        // maxBorrowValue = 0.5e18 * 5 = 2.5e18; min health needs newDebtValue <= ~0.55e18
        vm.prank(vault);
        ledger.modifyCollateral(vault, eth, int256(10e18));

        // Check if can borrow small amount (0.5e18 fits within both limits)
        (bool canBorrow, bytes32 reasonCode) = ledger.canBorrow(vault, currency, 0.5e18);

        assertTrue(canBorrow, "Should be able to borrow");
        assertEq(reasonCode, bytes32(0));
    }

    function test_CanBorrow_RevertIfDebtCeilingExceeded() public {
        address currency = address(0x100);

        // Set low debt ceiling (requires PARAM_MANAGER_ROLE)
        vm.prank(admin);
        ledger.setRiskParameters(currency, 1000e18, 9000, 50000);

        vm.prank(vault);
        ledger.modifyCollateral(vault, eth, int256(100e18));

        // Try to borrow more than ceiling
        (bool canBorrow, bytes32 reasonCode) = ledger.canBorrow(vault, currency, 2000e18);

        assertFalse(canBorrow);
        assertEq(reasonCode, keccak256("DEBT_CEILING_EXCEEDED"));
    }

    function test_SetRiskParameters() public {
        address asset = address(0x200);

        vm.prank(admin);
        ledger.setRiskParameters(asset, 1_000_000e18, 9000, 50000);

        assertEq(ledger.debtCeiling(asset), 1_000_000e18);
        assertEq(ledger.liquidationRatio(asset), 9000);
        assertEq(ledger.creditMultiplier(asset), 50000);
        assertTrue(ledger.isRegisteredAsset(asset));
    }

    function test_SetRiskParameters_RevertIfInvalidRatio() public {
        address asset = address(0x200);

        vm.prank(admin);
        vm.expectRevert("Ledger: invalid liquidation ratio");
        ledger.setRiskParameters(asset, 1_000_000e18, 15000, 50000); // > 100%

        vm.prank(admin);
        vm.expectRevert("Ledger: invalid credit multiplier");
        ledger.setRiskParameters(asset, 1_000_000e18, 9000, 150000); // > 10x
    }
}