using Microsoft.Extensions.Options;
using MP.Core.Conf;

namespace MP.RIOC.Services
{
    public sealed class LuaScriptProvider
    {
        private readonly Dictionary<string, string> _scripts;

        public IReadOnlyDictionary<string, string> Scripts => _scripts;

        public LuaScriptProvider(
            IOptions<RedisScriptsConfig> cfg,
            IWebHostEnvironment env)
        {
            _scripts = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);

            foreach (var kv in cfg.Value.Scripts)
            {
                var name = kv.Key;
                var relativePath = kv.Value;

                var fullPath = Path.Combine(env.ContentRootPath, relativePath);

                if (!File.Exists(fullPath))
                    throw new FileNotFoundException($"Script Lua non trovato: {fullPath}");

                var content = File.ReadAllText(fullPath);

                _scripts[name] = content;
            }
        }

        public string Get(string name)
        {
            if (!_scripts.TryGetValue(name, out var script))
                throw new KeyNotFoundException($"Script Lua '{name}' non trovato.");

            return script;
        }
    }
}