using System.Text.Json;
using Microsoft.AspNetCore.Mvc;
using TuringMachine.Core;

namespace TuringMachine.Server.Controllers
{
    [ApiController]
    [Route("api/[controller]")]
    public class ExamplesController : ControllerBase
    {
        private static readonly JsonSerializerOptions JsonOptions = new()
        {
            PropertyNameCaseInsensitive = true
        };

        private readonly IWebHostEnvironment _env;

        public ExamplesController(IWebHostEnvironment env)
        {
            _env = env;
        }

        /// <summary>
        /// Reads and returns the example list from a JSON file.
        /// The file is read on every request so changes are reflected without server restart.
        /// </summary>
        [HttpGet]
        public async Task<ActionResult<List<ExampleConfig>>> GetExamples()
        {
            var filePath = Path.Combine(_env.ContentRootPath, "Examples", "Examples.json");

            if (!System.IO.File.Exists(filePath))
            {
                return NotFound("Examples.json not found.");
            }

            var json = await System.IO.File.ReadAllTextAsync(filePath);
            var examples = JsonSerializer.Deserialize<List<ExampleConfig>>(json, JsonOptions);

            return Ok(examples ?? new List<ExampleConfig>());
        }
    }
}