namespace ReactorMaintenance.Simulation.Tests;

public sealed class LevelEditorTests
{
    [Fact]
    public void DoorToolPlacesSingleFloorDoorProp()
    {
        var level = LevelState.Create("Door editor", 6, 6);

        var next = LevelEditor.Apply(level, new(2, 2), new() { Tool = EEditorTool.Door });

        Assert.Equal(EPropType.Door, next.GetProp(new(2, 2)).Type);
        Assert.Equal(EDoorState.Closed, next.GetProp(new(2, 2)).DoorState);
    }

    [Fact]
    public void DoorToolTogglesExistingDoorState()
    {
        var level = LevelState.Create("Door editor", 6, 6);
        level = LevelEditor.Apply(level, new(2, 2), new() { Tool = EEditorTool.Door });

        var opened = LevelEditor.Apply(level, new(2, 2), new() { Tool = EEditorTool.Door });
        var closed = LevelEditor.Apply(opened, new(2, 2), new() { Tool = EEditorTool.Door });

        Assert.Equal(EDoorState.Open, opened.GetProp(new(2, 2)).DoorState);
        Assert.Equal(EDoorState.Closed, closed.GetProp(new(2, 2)).DoorState);
    }

    [Fact]
    public void WallToolPreservesUndergroundNetworks()
    {
        var level = LevelState.Create("Wall editor", 6, 6);
        var position = new GridPosition(2, 2);
        level = LevelEditor.Apply(level, position, new() { Tool = EEditorTool.Underground, Carrier = ECarrierType.Fuel });
        level = LevelEditor.Apply(level, position, new() { Tool = EEditorTool.Underground, Carrier = ECarrierType.Water });
        level = LevelEditor.Apply(level, position, new() { Tool = EEditorTool.Underground, Carrier = ECarrierType.Electricity });

        var next = LevelEditor.Apply(level, position, new() { Tool = EEditorTool.Wall });

        Assert.Equal(EUndergroundState.Intact, next.GetUnderground(position, ECarrierType.Fuel).State);
        Assert.Equal(EUndergroundState.Intact, next.GetUnderground(position, ECarrierType.Water).State);
        Assert.Equal(EUndergroundState.Intact, next.GetUnderground(position, ECarrierType.Electricity).State);
    }

    [Fact]
    public void UndergroundToolCanPaintAdjacentCellsRepeatedly()
    {
        var level = LevelState.Create("Network editor", 6, 6);
        var command = new EditorToolCommand { Tool = EEditorTool.Underground, Carrier = ECarrierType.Fuel };

        level = LevelEditor.Apply(level, new(1, 1), command);
        level = LevelEditor.Apply(level, new(2, 1), command);
        level = LevelEditor.Apply(level, new(3, 1), command);

        Assert.Equal(EUndergroundState.Intact, level.GetUnderground(new(1, 1), ECarrierType.Fuel).State);
        Assert.Equal(EUndergroundState.Intact, level.GetUnderground(new(2, 1), ECarrierType.Fuel).State);
        Assert.Equal(EUndergroundState.Intact, level.GetUnderground(new(3, 1), ECarrierType.Fuel).State);
    }

    [Fact]
    public void ConsumerToolPlacesCarrierAgnosticConsumer()
    {
        var level = LevelState.Create("Consumer editor", 6, 6);

        var next = LevelEditor.Apply(level, new(2, 2), new() { Tool = EEditorTool.Consumer, Carrier = ECarrierType.Fuel });

        Assert.Equal(EPropType.Consumer, next.GetProp(new(2, 2)).Type);
        Assert.Equal(EConsumerServiceState.Unknown, next.GetProp(new(2, 2)).FuelServiceState);
        Assert.Equal(EConsumerServiceState.Unknown, next.GetProp(new(2, 2)).WaterServiceState);
        Assert.Equal(EConsumerServiceState.Unknown, next.GetProp(new(2, 2)).ElectricityServiceState);
    }

    [Fact]
    public void ElectricityLeakUsesAuthoredWallAccessFace()
    {
        var level = LevelState.Create("Electricity leak editor", 6, 6);
        level = level.SetTerrain(new(2, 2), ECellTerrain.Wall);

        var next = LevelEditor.SetLeak(level, new(2, 2), new(2, 3), ECarrierType.Electricity);
        var rejected = LevelEditor.SetLeak(next, new(2, 2), new(4, 4), ECarrierType.Electricity);

        Assert.Single(next.Leaks);
        Assert.Equal(new(2, 3), next.Leaks[0].AccessPosition);
        Assert.Equal(EUndergroundState.Leaking, next.GetUnderground(new(2, 2), ECarrierType.Electricity).State);
        Assert.Equal(next.Leaks, rejected.Leaks);
    }

    [Fact]
    public void ElectricityLeakAccessCyclesAcrossAdjacentFloorFaces()
    {
        var level = LevelState.Create("Electricity leak editor", 6, 6);
        level = level.SetTerrain(new(2, 2), ECellTerrain.Wall);
        level = level.SetTerrain(new(2, 1), ECellTerrain.Wall);
        level = LevelEditor.Apply(level, new(2, 2), new() { Tool = EEditorTool.Underground, Carrier = ECarrierType.Electricity });

        var first = LevelEditor.CycleElectricityLeakAccess(level, new(2, 2));
        var second = LevelEditor.CycleElectricityLeakAccess(first, new(2, 2));

        Assert.Single(first.Leaks);
        Assert.Equal(new(3, 2), first.Leaks[0].AccessPosition);
        Assert.Single(second.Leaks);
        Assert.Equal(new(2, 3), second.Leaks[0].AccessPosition);
    }

    [Fact]
    public void ReactorControlToolCreatesUnboundReactorState()
    {
        var level = LevelState.Create("Reactor editor", 6, 6);

        var next = LevelEditor.Apply(level, new(2, 2), new() { Tool = EEditorTool.ReactorControl });

        Assert.Single(next.Reactors);
        Assert.Equal(new(2, 2), next.Reactors[0].ControlPosition);
        Assert.Equal(1, next.Reactors[0].ReactorId);
    }

    [Fact]
    public void MoveOccupantMovesRobotToFloorDestination()
    {
        var level = LevelState.Create("Move editor", 6, 6) with { Robot = new() { Position = new(1, 1) } };

        var next = LevelEditor.MoveOccupant(level, new(1, 1), new(3, 3));

        Assert.Equal(new(3, 3), next.Robot.Position);
    }

    [Fact]
    public void MoveOccupantMovesPropAndUpdatesReactorControlPosition()
    {
        var level = LevelState.Create("Move editor", 6, 6);
        level = LevelEditor.Apply(level, new(1, 1), new() { Tool = EEditorTool.ReactorControl });

        var next = LevelEditor.MoveOccupant(level, new(1, 1), new(3, 3));

        Assert.Equal(EPropType.None, next.GetProp(new(1, 1)).Type);
        Assert.Equal(EPropType.ReactorControl, next.GetProp(new(3, 3)).Type);
        Assert.Equal(new(3, 3), next.Reactors[0].ControlPosition);
    }

    [Fact]
    public void MoveOccupantMovesSourcesAsProps()
    {
        var level = LevelState.Create("Move editor", 6, 6);
        level = LevelEditor.Apply(level, new(1, 1), new() { Tool = EEditorTool.Flow, Carrier = ECarrierType.Fuel });

        var result = LevelEditor.TryMoveOccupant(level, new(1, 1), new(3, 3));

        Assert.True(result.Success, result.Reason);
        Assert.Equal(EPropType.None, result.Level.GetProp(new(1, 1)).Type);
        Assert.Equal(EPropType.Flow, result.Level.GetProp(new(3, 3)).Type);
        Assert.Equal(ECarrierType.Fuel, result.Level.GetProp(new(3, 3)).Carrier);
    }

    [Fact]
    public void MoveOccupantMovesFuelLeakToFloorDestination()
    {
        var level = LevelState.Create("Move editor", 6, 6);
        level = LevelEditor.SetLeak(level, new(1, 1), new(1, 1), ECarrierType.Fuel);

        var result = LevelEditor.TryMoveOccupant(level, new(1, 1), new(3, 3));

        Assert.True(result.Success, result.Reason);
        Assert.Single(result.Level.Leaks);
        Assert.Equal(new(3, 3), result.Level.Leaks[0].UndergroundPosition);
        Assert.Equal(new(3, 3), result.Level.Leaks[0].AccessPosition);
        Assert.Equal(EUndergroundState.Leaking, result.Level.GetUnderground(new(3, 3), ECarrierType.Fuel).State);
        Assert.Equal(EUndergroundState.Absent, result.Level.GetUnderground(new(1, 1), ECarrierType.Fuel).State);
    }

    [Fact]
    public void MoveOccupantMovesElectricityLeakAccessFace()
    {
        var level = LevelState.Create("Move editor", 6, 6);
        level = level.SetTerrain(new(2, 2), ECellTerrain.Wall);
        level = LevelEditor.SetLeak(level, new(2, 2), new(2, 3), ECarrierType.Electricity);

        var result = LevelEditor.TryMoveOccupant(level, new(2, 3), new(3, 2));

        Assert.True(result.Success, result.Reason);
        Assert.Single(result.Level.Leaks);
        Assert.Equal(new(2, 2), result.Level.Leaks[0].UndergroundPosition);
        Assert.Equal(new(3, 2), result.Level.Leaks[0].AccessPosition);
    }

    [Fact]
    public void MoveOccupantReportsInvalidStartAndDestinationReasons()
    {
        var level = LevelState.Create("Move editor", 6, 6);
        level = level.SetTerrain(new(3, 3), ECellTerrain.Wall);
        level = level.SetProp(new(1, 1), new() { Type = EPropType.Consumer });
        level = level.SetProp(new(2, 2), new() { Type = EPropType.Consumer });

        var invalidStart = LevelEditor.TryMoveOccupant(level, new(4, 4), new(5, 5));
        var invalidDestination = LevelEditor.TryMoveOccupant(level, new(1, 1), new(2, 2));

        Assert.False(invalidStart.Success);
        Assert.Contains("No movable", invalidStart.Reason);
        Assert.False(invalidDestination.Success);
        Assert.Contains("occupied", invalidDestination.Reason);
    }
}