using EndMove.Sudoku.Solver.Core.Algorithms;

namespace EndMove.Sudoku.Solver.Test
{
    public class SolverBaseTests
    {
        // Mock implementation of SolverBase for testing
        private class MockSolver : SolverBase
        {
            public MockSolver(Action<int[,]> displayBoard) : base(displayBoard) { }

            public override (bool, int[,]) Solve(int[,] board)
            {
                throw new NotImplementedException();
            }

            public override (bool, int[]) Solve(int[] board)
            {
                throw new NotImplementedException();
            }
        }

        // Test fixture
        private SolverBase _solverBase;

        [SetUp]
        public void Setup()
        {
            // Create a mock display method (if necessary)
            Action<int[,]> mockDisplay = (board) => { /* mock display implementation */ };
            _solverBase = new MockSolver(mockDisplay);
        }

        [Test]
        public void IsValid1D_ValidPlacement_ReturnsTrue()
        {
            // GIVEN
            int row = 1, col = 4, n = 1;
            int[,] board = {
                //|--------|-------|--------|
                { 0, 0, 1, 0, 0, 0, 1, 0, 0 },
                { 0, 0, 0, 0, 0, 0, 0, 0, 0 },
                { 0, 0, 1, 0, 0, 0, 1, 0, 0 },
                { 0, 0, 0, 1, 0, 1, 0, 0, 0 },
                { 0, 0, 0, 0, 0, 0, 0, 0, 0 },
                { 0, 0, 0, 0, 0, 0, 0, 0, 0 },
                { 0, 0, 0, 0, 0, 0, 0, 0, 0 },
                { 0, 0, 0, 0, 0, 0, 0, 0, 0 },
                { 0, 0, 0, 0, 0, 0, 0, 0, 0 }
                //|--------|-------|--------|
            };

            // WHEN
            bool result = _solverBase.IsValid(board, row, col, n);

            // THEN
            Assert.That(result, Is.True, "Expected valid placement to return true.");
        }

        [Test]
        public void IsValid1D_InvalidPlacementInColumn_ReturnsFalse()
        {
            // GIVEN
            int row = 3, col = 2, n = 9;
            int[,] board = {
                //|--------|-------|--------|
                { 0, 0, 0, 0, 0, 0, 0, 0, 0 },
                { 0, 0, 9, 0, 0, 0, 0, 0, 0 },
                { 0, 0, 0, 0, 0, 0, 0, 0, 0 },
                { 0, 0, 0, 0, 0, 0, 0, 0, 0 },
                { 0, 0, 0, 0, 0, 0, 0, 0, 0 },
                { 0, 0, 0, 0, 0, 0, 0, 0, 0 },
                { 0, 0, 0, 0, 0, 0, 0, 0, 0 },
                { 0, 0, 0, 0, 0, 0, 0, 0, 0 },
                { 0, 0, 0, 0, 0, 0, 0, 0, 0 }
                //|--------|-------|--------|
            };

            // WHEN
            bool result = _solverBase.IsValid(board, row, col, n);

            // THEN
            Assert.That(result, Is.False, "Expected invalid placement in column to return false.");
        }

        [Test]
        public void IsValid1D_InvalidPlacementInRow_ReturnsFalse()
        {
            // GIVEN
            int row = 4, col = 2, n = 9;
            int[,] board = {
                //|--------|-------|--------|
                { 0, 0, 0, 0, 0, 0, 0, 0, 0 },
                { 0, 0, 0, 0, 0, 0, 0, 0, 0 },
                { 0, 0, 0, 0, 0, 0, 0, 0, 0 },
                { 0, 0, 0, 0, 0, 0, 0, 0, 0 },
                { 0, 0, 0, 0, 0, 0, 0, 9, 0 },
                { 0, 0, 0, 0, 0, 0, 0, 0, 0 },
                { 0, 0, 0, 0, 0, 0, 0, 0, 0 },
                { 0, 0, 0, 0, 0, 0, 0, 0, 0 },
                { 0, 0, 0, 0, 0, 0, 0, 0, 0 }
                //|--------|-------|--------|
            };

            // WHEN
            bool result = _solverBase.IsValid(board, row, col, n);

            // THEN
            Assert.That(result, Is.False, "Expected invalid placement in row to return false.");
        }

        [Test]
        public void IsValid1D_InvalidPlacementInBox_ReturnsFalse()
        {
            // GIVEN
            int row = 8, col = 5, n = 1;
            int[,] board = {
                //|--------|-------|--------|
                { 0, 0, 0, 0, 0, 0, 0, 0, 0 },
                { 0, 0, 9, 0, 0, 0, 0, 0, 0 },
                { 0, 0, 0, 0, 0, 0, 0, 0, 0 },
                { 0, 0, 0, 0, 0, 0, 0, 0, 0 },
                { 0, 0, 0, 0, 0, 0, 0, 0, 0 },
                { 0, 0, 0, 0, 0, 0, 0, 0, 0 },
                { 0, 0, 0, 1, 0, 0, 0, 0, 0 },
                { 0, 0, 0, 0, 0, 0, 0, 0, 0 },
                { 0, 0, 0, 0, 0, 0, 0, 0, 0 }
                //|--------|-------|--------|
            };

            // WHEN
            bool result = _solverBase.IsValid(board, row, col, n);

            // THEN
            Assert.That(result, Is.False, "Expected invalid placement in box to return false.");
        }
    }
}