Print_server/Inspectron.Epson.Templates.Tests/Interpreter/InterpreterConditionTests.cs

using Inspectron.Epson.Templates.Configuration;
using Inspectron.Epson.Templates.Interpreter;
using Inspectron.Epson.Templates.Language;
using Inspectron.Epson.Templates.Language.Nodes;

namespace Inspectron.Epson.Templates.Tests.Interpreter;

public class InterpreterConditionTests
{
    private readonly PrinterProfile _profile = new("test", "Test Printer", 48, 24, false);

    private TemplateNode Parse(string source)
    {
        var lexer = new Lexer(source);
        var parser = new Parser(lexer.Tokenize().Tokens);
        return parser.Parse().Template;
    }

    [Fact]
    public void Interpret_IfTruthy_ExecutesBody()
    {
        var template = Parse("@if HasValue\nYes\n@end");
        var interpreter = new TemplateInterpreter(_profile);
        var commands = interpreter.Interpret(template, """{"HasValue": true}""");

        Assert.Contains(commands, c => c.Text == "Yes");
    }

    [Fact]
    public void Interpret_IfFalsy_SkipsBody()
    {
        var template = Parse("@if HasValue\nYes\n@end");
        var interpreter = new TemplateInterpreter(_profile);
        var commands = interpreter.Interpret(template, """{"HasValue": false}""");

        Assert.DoesNotContain(commands, c => c.Text == "Yes");
    }

    [Fact]
    public void Interpret_IfStringEmpty_IsFalsy()
    {
        var template = Parse("@if Name\nHas Name\n@end");
        var interpreter = new TemplateInterpreter(_profile);
        var commands = interpreter.Interpret(template, """{"Name": ""}""");

        Assert.DoesNotContain(commands, c => c.Text == "Has Name");
    }

    [Fact]
    public void Interpret_IfStringNotEmpty_IsTruthy()
    {
        var template = Parse("@if Name\nHas Name\n@end");
        var interpreter = new TemplateInterpreter(_profile);
        var commands = interpreter.Interpret(template, """{"Name": "John"}""");

        Assert.Contains(commands, c => c.Text == "Has Name");
    }

    [Fact]
    public void Interpret_IfArrayEmpty_IsFalsy()
    {
        var template = Parse("@if Items\nHas Items\n@end");
        var interpreter = new TemplateInterpreter(_profile);
        var commands = interpreter.Interpret(template, """{"Items": []}""");

        Assert.DoesNotContain(commands, c => c.Text == "Has Items");
    }

    [Fact]
    public void Interpret_IfArrayNotEmpty_IsTruthy()
    {
        var template = Parse("@if Items\nHas Items\n@end");
        var interpreter = new TemplateInterpreter(_profile);
        var commands = interpreter.Interpret(template, """{"Items": [1, 2]}""");

        Assert.Contains(commands, c => c.Text == "Has Items");
    }

    [Fact]
    public void Interpret_IfNegation_InvertsCondition()
    {
        var template = Parse("@if !HasValue\nNo Value\n@end");
        var interpreter = new TemplateInterpreter(_profile);
        var commands = interpreter.Interpret(template, """{"HasValue": false}""");

        Assert.Contains(commands, c => c.Text == "No Value");
    }

    [Fact]
    public void Interpret_IfEqualsComparison_Works()
    {
        var template = Parse("@if Status == \"active\"\nActive\n@end");
        var interpreter = new TemplateInterpreter(_profile);
        var commands = interpreter.Interpret(template, """{"Status": "active"}""");

        Assert.Contains(commands, c => c.Text == "Active");
    }

    [Fact]
    public void Interpret_IfNotEqualsComparison_Works()
    {
        var template = Parse("@if Status != \"inactive\"\nNot Inactive\n@end");
        var interpreter = new TemplateInterpreter(_profile);
        var commands = interpreter.Interpret(template, """{"Status": "active"}""");

        Assert.Contains(commands, c => c.Text == "Not Inactive");
    }

    [Fact]
    public void Interpret_IfGreaterThanComparison_Works()
    {
        var template = Parse("@if Count > 5\nMany Items\n@end");
        var interpreter = new TemplateInterpreter(_profile);
        var commands = interpreter.Interpret(template, """{"Count": 10}""");

        Assert.Contains(commands, c => c.Text == "Many Items");
    }

    [Fact]
    public void Interpret_IfLessThanComparison_Works()
    {
        var template = Parse("@if Count < 5\nFew Items\n@end");
        var interpreter = new TemplateInterpreter(_profile);
        var commands = interpreter.Interpret(template, """{"Count": 2}""");

        Assert.Contains(commands, c => c.Text == "Few Items");
    }

    [Fact]
    public void Interpret_IfElse_ExecutesElseWhenFalse()
    {
        var template = Parse("@if HasValue\nYes\n@else\nNo\n@end");
        var interpreter = new TemplateInterpreter(_profile);
        var commands = interpreter.Interpret(template, """{"HasValue": false}""");

        Assert.DoesNotContain(commands, c => c.Text == "Yes");
        Assert.Contains(commands, c => c.Text == "No");
    }

    [Fact]
    public void Interpret_IfElseIf_ExecutesCorrectBranch()
    {
        var template = Parse("@if Value == 1\nOne\n@elseif Value == 2\nTwo\n@else\nOther\n@end");
        var interpreter = new TemplateInterpreter(_profile);
        var commands = interpreter.Interpret(template, """{"Value": 2}""");

        Assert.DoesNotContain(commands, c => c.Text == "One");
        Assert.Contains(commands, c => c.Text == "Two");
        Assert.DoesNotContain(commands, c => c.Text == "Other");
    }

    [Fact]
    public void Interpret_ArrayCountComparison_Works()
    {
        var template = Parse("@if Items.count > 0\nHas Items\n@end");
        var interpreter = new TemplateInterpreter(_profile);
        var commands = interpreter.Interpret(template, """{"Items": [1, 2, 3]}""");

        Assert.Contains(commands, c => c.Text == "Has Items");
    }
}