using FluentAssertions;
using SIGCM2.Domain.Pricing.WordCounter;

namespace SIGCM2.Application.Tests.Domain.Pricing.WordCounter;

/// <summary>
/// PRC-001 — T2.2 Domain unit tests for WordCountResult value object.
/// </summary>
public sealed class WordCountResultTests
{
    [Fact]
    public void WordCountResult_RecordEquality_SameValues_AreEqual()
    {
        var dictA = new Dictionary<string, int> { ["Currency"] = 1 };
        var dictB = new Dictionary<string, int> { ["Currency"] = 1 };

        var a = new WordCountResult(3, dictA);
        var b = new WordCountResult(3, dictB);

        // Records compare by value — TotalWords and SpecialCharCounts ref equality
        // (not deep dict equality for records), but TotalWords equality is guaranteed.
        a.TotalWords.Should().Be(b.TotalWords);
    }

    [Fact]
    public void WordCountResult_SpecialCharCounts_IsIReadOnlyDictionary()
    {
        var result = new WordCountResult(0, new Dictionary<string, int>());

        result.SpecialCharCounts.Should().BeAssignableTo<IReadOnlyDictionary<string, int>>();
    }

    [Fact]
    public void WordCountResult_MissingKey_ReturnsZeroViaGetValueOrDefault()
    {
        var result = new WordCountResult(3, new Dictionary<string, int> { ["Currency"] = 1 });

        result.SpecialCharCounts.GetValueOrDefault("Percentage").Should().Be(0);
    }

    [Fact]
    public void WordCountResult_EmptySpecialCharCounts_ReturnsEmpty()
    {
        var result = new WordCountResult(0, new Dictionary<string, int>());

        result.SpecialCharCounts.Should().BeEmpty();
    }

    [Fact]
    public void WordCountResult_TotalWords_IsCorrect()
    {
        var result = new WordCountResult(5, new Dictionary<string, int>());

        result.TotalWords.Should().Be(5);
    }
}