using System.Text.Encodings.Web;
using System.Text.Json;
using System.Text.Json.Nodes;
using HSchool.Content;

namespace HSchool.People.Tests;

/// <summary>
/// Writes the host golden save files. Not a correctness test — run with WRITE_GOLDEN=1 after an
/// intentional generation change, then commit the AppHost fixtures in the same change.
/// </summary>
public class GoldenSaveDump
{
    [Fact]
    public void Dump_HostSaveFixtures_WhenAsked()
    {
        if (!string.Equals(Environment.GetEnvironmentVariable("WRITE_GOLDEN"), "1", StringComparison.Ordinal))
        {
            return;
        }

        var catalog = Fixtures.Catalog();
        var map = TwoClassrooms();
        var roster = RosterGenerator.Generate(catalog, map, schoolSeed: 1, "Russia", Fixtures.AsOf, "RussianLanguage");
        var pool = ApplicantPool.Create(catalog, roster, schoolSeed: 1, "Russia", Fixtures.AsOf, "RussianLanguage");
        var people = RosterJson.Serialize(RosterDocument.From(1, roster, pool));
        var mapNode = JsonNode.Parse(JsonSerializer.Serialize(map, Jsonc.SerializerOptions));
        var current = SchoolJson(mapNode, includeNative: true);
        var legacy = SchoolJson(mapNode, includeNative: false);

        var root = Path.Combine(Fixtures.RepoRoot(), "tests", "HSchool.AppHost.Tests", "golden");
        Write(Path.Combine(root, "current", "1.json"), current);
        Write(Path.Combine(root, "current", "1.people.json"), people);
        Write(Path.Combine(root, "legacy-no-native", "1.json"), legacy);
        // people.json in legacy-no-native stays the historic undressed file: load must dress it.
    }

    internal static MapLayout TwoClassrooms() =>
        new()
        {
            Territory = new TerritoryNode { Id = "yard", Def = "SchoolYard" },
            Buildings = [new BuildingNode { Id = "main", Def = "MainBuilding" }],
            Floors = [new FloorNode { Id = "floor-1", Def = "StandardFloor", Building = "main", Label = "1" }],
            Rooms =
            [
                new RoomNode
                {
                    Id = "classroom-00",
                    Def = "Classroom",
                    Building = "main",
                    Floor = "floor-1",
                    Label = "101",
                    Seats = 16,
                },
                new RoomNode
                {
                    Id = "classroom-01",
                    Def = "Classroom",
                    Building = "main",
                    Floor = "floor-1",
                    Label = "102",
                    Seats = 16,
                },
            ],
            Links =
            [
                new MapLink { A = "yard", B = "classroom-00" },
                new MapLink { A = "yard", B = "classroom-01" },
            ],
        };

    private static string SchoolJson(JsonNode? map, bool includeNative)
    {
        var root = new JsonObject
        {
            ["format"] = 2,
            ["id"] = 1,
            ["name"] = "Золотая",
            ["gameTime"] = "2012-03-31T06:00:00Z",
            ["running"] = false,
            ["speedIndex"] = 1,
            ["modIds"] = new JsonArray("core"),
            ["map"] = map?.DeepClone(),
            ["nameSetId"] = "Slavic",
        };
        if (includeNative)
        {
            root["nativeLanguage"] = "RussianLanguage";
        }

        return root.ToJsonString(new JsonSerializerOptions
        {
            WriteIndented = true,
            Encoder = JavaScriptEncoder.UnsafeRelaxedJsonEscaping,
        });
    }

    private static void Write(string path, string contents)
    {
        Directory.CreateDirectory(Path.GetDirectoryName(path)!);
        File.WriteAllText(path, contents);
    }
}