using Moq;
using ScadaLink.Commons.Entities.Scripts;
using ScadaLink.Commons.Interfaces.Repositories;
using ScadaLink.Commons.Interfaces.Services;

namespace ScadaLink.TemplateEngine.Tests;

public class SharedScriptServiceTests
{
    private readonly Mock<ITemplateEngineRepository> _repoMock;
    private readonly Mock<IAuditService> _auditMock;
    private readonly SharedScriptService _service;

    public SharedScriptServiceTests()
    {
        _repoMock = new Mock<ITemplateEngineRepository>();
        _auditMock = new Mock<IAuditService>();
        _repoMock.Setup(r => r.SaveChangesAsync(It.IsAny<CancellationToken>())).ReturnsAsync(1);
        _service = new SharedScriptService(_repoMock.Object, _auditMock.Object);
    }

    [Fact]
    public async Task CreateSharedScript_Success()
    {
        _repoMock.Setup(r => r.GetSharedScriptByNameAsync("Helpers", It.IsAny<CancellationToken>()))
            .ReturnsAsync((SharedScript?)null);

        var result = await _service.CreateSharedScriptAsync(
            "Helpers", "public static int Add(int a, int b) { return a + b; }", null, null, "admin");

        Assert.True(result.IsSuccess);
        Assert.Equal("Helpers", result.Value.Name);
        _repoMock.Verify(r => r.AddSharedScriptAsync(It.IsAny<SharedScript>(), It.IsAny<CancellationToken>()), Times.Once);
    }

    [Fact]
    public async Task CreateSharedScript_EmptyName_Fails()
    {
        var result = await _service.CreateSharedScriptAsync("", "code", null, null, "admin");
        Assert.True(result.IsFailure);
        Assert.Contains("name is required", result.Error);
    }

    [Fact]
    public async Task CreateSharedScript_EmptyCode_Fails()
    {
        var result = await _service.CreateSharedScriptAsync("Test", "", null, null, "admin");
        Assert.True(result.IsFailure);
        Assert.Contains("code is required", result.Error);
    }

    [Fact]
    public async Task CreateSharedScript_DuplicateName_Fails()
    {
        _repoMock.Setup(r => r.GetSharedScriptByNameAsync("Helpers", It.IsAny<CancellationToken>()))
            .ReturnsAsync(new SharedScript("Helpers", "existing code"));

        var result = await _service.CreateSharedScriptAsync("Helpers", "new code", null, null, "admin");

        Assert.True(result.IsFailure);
        Assert.Contains("already exists", result.Error);
    }

    [Fact]
    public async Task CreateSharedScript_UnbalancedBraces_Fails()
    {
        _repoMock.Setup(r => r.GetSharedScriptByNameAsync("Bad", It.IsAny<CancellationToken>()))
            .ReturnsAsync((SharedScript?)null);

        var result = await _service.CreateSharedScriptAsync("Bad", "public void Run() {", null, null, "admin");

        Assert.True(result.IsFailure);
        Assert.Contains("Syntax error", result.Error);
    }

    [Fact]
    public async Task UpdateSharedScript_Success()
    {
        var existing = new SharedScript("Helpers", "old code") { Id = 1 };
        _repoMock.Setup(r => r.GetSharedScriptByIdAsync(1, It.IsAny<CancellationToken>())).ReturnsAsync(existing);

        var result = await _service.UpdateSharedScriptAsync(1, "return 42;", null, null, "admin");

        Assert.True(result.IsSuccess);
        Assert.Equal("return 42;", result.Value.Code);
    }

    [Fact]
    public async Task UpdateSharedScript_NotFound_Fails()
    {
        _repoMock.Setup(r => r.GetSharedScriptByIdAsync(999, It.IsAny<CancellationToken>())).ReturnsAsync((SharedScript?)null);

        var result = await _service.UpdateSharedScriptAsync(999, "code", null, null, "admin");

        Assert.True(result.IsFailure);
        Assert.Contains("not found", result.Error);
    }

    [Fact]
    public async Task DeleteSharedScript_Success()
    {
        var existing = new SharedScript("Helpers", "code") { Id = 1 };
        _repoMock.Setup(r => r.GetSharedScriptByIdAsync(1, It.IsAny<CancellationToken>())).ReturnsAsync(existing);

        var result = await _service.DeleteSharedScriptAsync(1, "admin");

        Assert.True(result.IsSuccess);
        _repoMock.Verify(r => r.DeleteSharedScriptAsync(1, It.IsAny<CancellationToken>()), Times.Once);
    }

    [Fact]
    public async Task DeleteSharedScript_NotFound_Fails()
    {
        _repoMock.Setup(r => r.GetSharedScriptByIdAsync(999, It.IsAny<CancellationToken>())).ReturnsAsync((SharedScript?)null);

        var result = await _service.DeleteSharedScriptAsync(999, "admin");

        Assert.True(result.IsFailure);
        Assert.Contains("not found", result.Error);
    }

    // Syntax validation unit tests

    [Theory]
    [InlineData("return 42;", null)]
    [InlineData("public void Run() { }", null)]
    [InlineData("var x = new int[] { 1, 2, 3 };", null)]
    [InlineData("if (a > b) { return a; } else { return b; }", null)]
    public void ValidateSyntax_ValidCode_ReturnsNull(string code, string? expected)
    {
        Assert.Equal(expected, SharedScriptService.ValidateSyntax(code));
    }

    [Theory]
    [InlineData("public void Run() {")]
    [InlineData("return a + b);")]
    [InlineData("var x = new int[] { 1, 2 ;")]
    public void ValidateSyntax_InvalidCode_ReturnsError(string code)
    {
        var result = SharedScriptService.ValidateSyntax(code);
        Assert.NotNull(result);
        Assert.Contains("Syntax error", result);
    }
}
