using System.Text.Json;
using Xunit;
using Recordingtest.Normalizer;

namespace Recordingtest.Normalizer.Tests;

/// <summary>
/// Verifies that every "SuspectedNondeterministicFields" entry in
/// docs/sut-catalog/json-configs.json is covered by a semantically appropriate
/// rule that is actually present in the default profile.
/// </summary>
public class CoverageTests
{
    // Explicit field -> rule mapping. Each entry must be a rule that semantically
    // covers the kind of value the field holds.
    //   *Path / *FileName / *RecentFile* -> normalize_paths
    //   Known volatile boolean / color / scalar settings -> mask_volatile_settings
    // No catch-all to sort_json_keys for arbitrary scalars.
    private static readonly Dictionary<string, string> FieldRuleMap = new(StringComparer.Ordinal)
    {
        // path-bearing
        ["AutoSaveFilePath"] = "normalize_paths",
        ["AutoSave_RecentFileName"] = "normalize_paths",

        // volatile boolean / scalar UI settings
        ["CanOverrideWireColorWithFace"] = "mask_volatile_settings",
        ["IsSidePanelVisible"] = "mask_volatile_settings",
        ["OverrideFaceColor"] = "mask_volatile_settings",
        ["Solar_IsLocalTime"] = "mask_volatile_settings",
        ["VisibleGrid"] = "mask_volatile_settings",
        ["GridSnap"] = "mask_volatile_settings",
        ["MidpointOsnap"] = "mask_volatile_settings",
        ["GridSpacing"] = "mask_volatile_settings",

        // volatile color channels
        ["GridColor.ALPHA"] = "mask_volatile_settings",
        ["GridColor.BLUE"] = "mask_volatile_settings",
        ["GridColor.GREEN"] = "mask_volatile_settings",
        ["GridColor.RED"] = "mask_volatile_settings",
        ["MajorGridColor.ALPHA"] = "mask_volatile_settings",
        ["MajorGridColor.BLUE"] = "mask_volatile_settings",
        ["MajorGridColor.GREEN"] = "mask_volatile_settings",
        ["MajorGridColor.RED"] = "mask_volatile_settings",
    };

    private static string FindCatalog()
    {
        var dir = AppContext.BaseDirectory;
        for (int i = 0; i < 10 && dir is not null; i++)
        {
            var candidate = Path.Combine(dir, "docs", "sut-catalog", "json-configs.json");
            if (File.Exists(candidate)) return candidate;
            dir = Directory.GetParent(dir)?.FullName;
        }
        throw new FileNotFoundException("json-configs.json not found by walking up from " + AppContext.BaseDirectory);
    }

    [Fact]
    public void DefaultProfile_CoversAllSuspectedFields()
    {
        var path = FindCatalog();
        using var doc = JsonDocument.Parse(File.ReadAllText(path));
        var allFields = new HashSet<string>(StringComparer.Ordinal);
        foreach (var entry in doc.RootElement.EnumerateArray())
        {
            if (entry.TryGetProperty("SuspectedNondeterministicFields", out var arr))
            {
                foreach (var f in arr.EnumerateArray())
                {
                    var s = f.GetString();
                    if (!string.IsNullOrEmpty(s)) allFields.Add(s);
                }
            }
        }

        Assert.NotEmpty(allFields);

        var profile = Profile.Load("default");
        var profileRules = new HashSet<string>(profile.Rules, StringComparer.Ordinal);

        var unmapped = new List<string>();
        var notInProfile = new List<string>();
        foreach (var field in allFields)
        {
            if (!FieldRuleMap.TryGetValue(field, out var rule))
            {
                unmapped.Add(field);
                continue;
            }
            if (!profileRules.Contains(rule))
            {
                notInProfile.Add($"{field} -> {rule}");
            }
        }

        Assert.True(unmapped.Count == 0,
            "Suspected fields without an explicit semantic rule mapping: " + string.Join(", ", unmapped));
        Assert.True(notInProfile.Count == 0,
            "Mapped rules missing from default profile: " + string.Join(", ", notInProfile));
    }
}