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

import "forge-std/Test.sol";
import "../../src/RailTriggerRegistry.sol";
import "../../src/interfaces/IRailTriggerRegistry.sol";
import "../../src/libraries/RailTypes.sol";

contract RailTriggerFuzzTest is Test {
    RailTriggerRegistry public registry;
    address public admin;
    address public railOperator;
    address public railAdapter;
    address public token;

    function setUp() public {
        admin = address(0x1);
        railOperator = address(0x2);
        railAdapter = address(0x3);
        token = address(0x100);

        registry = new RailTriggerRegistry(admin);

        vm.startPrank(admin);
        registry.grantRole(registry.RAIL_OPERATOR_ROLE(), railOperator);
        registry.grantRole(registry.RAIL_ADAPTER_ROLE(), railAdapter);
        vm.stopPrank();
    }

    function testFuzz_createTrigger(
        uint8 railValue,
        bytes32 msgType,
        bytes32 accountRefId,
        bytes32 instructionId,
        uint256 amount
    ) public {
        // Bound rail value to valid enum
        RailTypes.Rail rail = RailTypes.Rail(railValue % 4);
        
        // Ensure non-zero values
        vm.assume(accountRefId != bytes32(0));
        vm.assume(instructionId != bytes32(0));
        vm.assume(amount > 0);
        vm.assume(amount < type(uint128).max); // Reasonable bound

        IRailTriggerRegistry.Trigger memory t = IRailTriggerRegistry.Trigger({
            id: 0,
            rail: rail,
            msgType: msgType,
            accountRefId: accountRefId,
            walletRefId: bytes32(0),
            token: token,
            amount: amount,
            currencyCode: keccak256("USD"),
            instructionId: instructionId,
            state: RailTypes.State.CREATED,
            createdAt: 0,
            updatedAt: 0
        });

        vm.prank(railOperator);
        uint256 id = registry.createTrigger(t);

        IRailTriggerRegistry.Trigger memory retrieved = registry.getTrigger(id);
        assertEq(uint8(retrieved.rail), uint8(rail));
        assertEq(retrieved.msgType, msgType);
        assertEq(retrieved.amount, amount);
        assertEq(retrieved.instructionId, instructionId);
        assertTrue(registry.instructionIdExists(instructionId));
    }

    function testFuzz_stateTransitions(
        bytes32 instructionId,
        uint8 targetStateValue
    ) public {
        vm.assume(instructionId != bytes32(0));
        
        // Create trigger
        IRailTriggerRegistry.Trigger memory t = IRailTriggerRegistry.Trigger({
            id: 0,
            rail: RailTypes.Rail.SWIFT,
            msgType: keccak256("pacs.008"),
            accountRefId: keccak256("account1"),
            walletRefId: bytes32(0),
            token: token,
            amount: 1000,
            currencyCode: keccak256("USD"),
            instructionId: instructionId,
            state: RailTypes.State.CREATED,
            createdAt: 0,
            updatedAt: 0
        });

        vm.prank(railOperator);
        uint256 id = registry.createTrigger(t);

        // Try valid transitions
        RailTypes.State targetState = RailTypes.State(targetStateValue % 8);
        
        // Valid transitions from CREATED
        if (targetState == RailTypes.State.VALIDATED || 
            targetState == RailTypes.State.REJECTED || 
            targetState == RailTypes.State.CANCELLED) {
            vm.prank(railAdapter);
            registry.updateState(id, targetState, bytes32(0));
            
            IRailTriggerRegistry.Trigger memory trigger = registry.getTrigger(id);
            assertEq(uint8(trigger.state), uint8(targetState));
        }
    }

    function testFuzz_duplicateInstructionId(
        bytes32 instructionId,
        bytes32 accountRefId1,
        bytes32 accountRefId2
    ) public {
        vm.assume(instructionId != bytes32(0));
        vm.assume(accountRefId1 != bytes32(0));
        vm.assume(accountRefId2 != bytes32(0));
        vm.assume(accountRefId1 != accountRefId2);

        IRailTriggerRegistry.Trigger memory t1 = IRailTriggerRegistry.Trigger({
            id: 0,
            rail: RailTypes.Rail.SWIFT,
            msgType: keccak256("pacs.008"),
            accountRefId: accountRefId1,
            walletRefId: bytes32(0),
            token: token,
            amount: 1000,
            currencyCode: keccak256("USD"),
            instructionId: instructionId,
            state: RailTypes.State.CREATED,
            createdAt: 0,
            updatedAt: 0
        });

        vm.prank(railOperator);
        registry.createTrigger(t1);

        // Try to create another trigger with same instructionId
        IRailTriggerRegistry.Trigger memory t2 = IRailTriggerRegistry.Trigger({
            id: 0,
            rail: RailTypes.Rail.FEDWIRE,
            msgType: keccak256("pain.001"),
            accountRefId: accountRefId2,
            walletRefId: bytes32(0),
            token: token,
            amount: 2000,
            currencyCode: keccak256("EUR"),
            instructionId: instructionId, // Same instructionId
            state: RailTypes.State.CREATED,
            createdAt: 0,
            updatedAt: 0
        });

        vm.prank(railOperator);
        vm.expectRevert("RailTriggerRegistry: duplicate instructionId");
        registry.createTrigger(t2);
    }
}