namespace HSchool.Content;

/// <summary>One school's map instance: tree grouping plus a walkable graph of territory and rooms.</summary>
public sealed class MapLayout
{
    public TerritoryNode? Territory { get; init; }

    public IReadOnlyList<BuildingNode> Buildings { get; init; } = [];

    public IReadOnlyList<FloorNode> Floors { get; init; } = [];

    public IReadOnlyList<RoomNode> Rooms { get; init; } = [];

    public IReadOnlyList<MapLink> Links { get; init; } = [];

    public static MapLayout Parse(string jsonc, string? source = null) =>
        Jsonc.Deserialize<MapLayout>(Jsonc.Parse(jsonc, source));

    /// <summary>RoomDef or TerritoryDef of this node, or null when the id is not on the map.</summary>
    public string? NodeDef(string nodeId)
    {
        if (Territory is { } territory && territory.Id.Equals(nodeId, StringComparison.Ordinal))
        {
            return territory.Def;
        }

        foreach (var room in Rooms)
        {
            if (room.Id.Equals(nodeId, StringComparison.Ordinal))
            {
                return room.Def;
            }
        }

        return null;
    }
}

public sealed class TerritoryNode
{
    public required string Id { get; init; }

    public required string Def { get; init; }
}

public sealed class BuildingNode
{
    public required string Id { get; init; }

    public required string Def { get; init; }
}

public sealed class FloorNode
{
    public required string Id { get; init; }

    public required string Def { get; init; }

    public required string Building { get; init; }

    public string? Label { get; init; }
}

public sealed class RoomNode
{
    public required string Id { get; init; }

    public required string Def { get; init; }

    public required string Building { get; init; }

    public required string Floor { get; init; }

    /// <summary>Optional designation such as a classroom number. The def label still supplies the noun.</summary>
    public string? Label { get; init; }

    /// <summary>
    /// Homeroom seat count. Capacity is <c>SeatThing.PupilSlots × Seats</c>. Named
    /// <see cref="Slots"/> stay on rooms whose furnishing actually varies.
    /// </summary>
    public int Seats { get; init; }

    public IReadOnlyList<SlotFill> Slots { get; init; } = [];
}

public sealed class SlotFill
{
    public required string Key { get; init; }

    public required string Thing { get; init; }

    /// <summary>
    /// How many of <see cref="Thing"/> occupy this slot. Missing or non-positive JSON is 1, so
    /// older maps without a count still round-trip.
    /// </summary>
    public int Count { get; init; } = 1;
}

public sealed class MapLink
{
    public required string A { get; init; }

    public required string B { get; init; }
}