namespace Theriapolis.Core.Data;

/// <summary>
/// Phase 6 M0 — bundle of all settlement-stamp content needed to drive
/// <see cref="World.Settlements.SettlementStamper"/>. Held by
/// <see cref="ContentResolver"/>; passed into <see cref="Tactical.TacticalChunkGen"/>
/// as an optional argument so headless tools that don't need full content
/// (e.g. worldgen-dump) can run without it.
/// </summary>
public sealed class SettlementContent
{
    public IReadOnlyDictionary<string, BuildingTemplateDef>  Buildings    { get; }
    public IReadOnlyDictionary<string, SettlementLayoutDef>  PresetByAnchor { get; }

    /// <summary>Tier 1..5 → procedural layout (or null if no procedural layout for that tier).</summary>
    public IReadOnlyDictionary<int, SettlementLayoutDef>     ProceduralByTier { get; }

    public SettlementContent(
        IReadOnlyDictionary<string, BuildingTemplateDef>  buildings,
        IReadOnlyDictionary<string, SettlementLayoutDef>  presetByAnchor,
        IReadOnlyDictionary<int, SettlementLayoutDef>     proceduralByTier)
    {
        Buildings        = buildings;
        PresetByAnchor   = presetByAnchor;
        ProceduralByTier = proceduralByTier;
    }

    /// <summary>
    /// Look up the layout to use for a given settlement, preferring the
    /// hand-authored preset for its anchor (if any) and falling back to the
    /// procedural layout for its tier.
    /// </summary>
    public SettlementLayoutDef? ResolveFor(World.Settlement settlement)
    {
        if (settlement.Anchor is { } anchor &&
            PresetByAnchor.TryGetValue(anchor.ToString(), out var preset))
            return preset;
        if (ProceduralByTier.TryGetValue(settlement.Tier, out var proc))
            return proc;
        return null;
    }
}