using Godot;
using System.Collections.Generic;
using System.Text.Json;

public partial class CreatureRegistry : Node
{
	public record CreatureDef(
		string id,
		string name,
		List<string> types,
		List<string> biomes,
		List<string> time_windows,
		int base_hp,
		int base_atk,
		int base_def,
		int capture_difficulty
	);

	public record CreatureFile(int schema, List<CreatureDef> creatures);

	private readonly Dictionary<string, CreatureDef> _byId = new();

	public CreatureDef Get(string id)
	{
		if (_byId.TryGetValue(id, out var def)) return def;
		throw new KeyNotFoundException($"Unknown creature id: {id}");
	}

	public bool TryGet(string id, out CreatureDef def) => _byId.TryGetValue(id, out def!);

	[Export] public NodePath PackManagerPath { get; set; }
	private PackManager? _packs;

	public override void _Ready()
	{
		_packs = GetNodeOrNull<PackManager>(PackManagerPath);
		if (_packs == null)
		{
			GD.PrintErr("CreatureRegistry: PackManagerPath not set.");
			return;
		}

		var path = _packs.Resolve("data/creatures/creatures.json");
		if (path == null)
		{
			GD.PrintErr("CreatureRegistry: Could not resolve data/creatures/creatures.json");
			return;
		}

		var json = FileAccess.GetFileAsString(path);
		var file = JsonSerializer.Deserialize<CreatureFile>(json);

		if (file?.creatures == null)
		{
			GD.PrintErr("CreatureRegistry: Failed to parse creatures.json");
			return;
		}

		_byId.Clear();
		foreach (var c in file.creatures)
			_byId[c.id] = c;

		GD.Print($"CreatureRegistry: loaded {_byId.Count} creatures");
	}
}