using System.Text.Json;
using Microsoft.Extensions.Options;
using SpaceGame.Api.Universe.Bootstrap;

namespace SpaceGame.Api.Universe.Scenario;

public sealed class ScenarioLoader(IOptions<StaticDataOptions> staticDataOptions)
{
    private readonly JsonSerializerOptions _jsonOptions = new()
    {
        PropertyNameCaseInsensitive = true,
    };

    public ScenarioDefinition? Load()
    {
        var scenarioPath = Path.Combine(staticDataOptions.Value.DataRoot, "scenario.json");
        if (!File.Exists(scenarioPath))
        {
            return null;
        }

        var json = File.ReadAllText(scenarioPath);
        return JsonSerializer.Deserialize<ScenarioDefinition>(json, _jsonOptions)
          ?? throw new InvalidOperationException("Unable to read scenario.json.");
    }
}