using Backend.Interface;
using Microsoft.AspNetCore.Mvc;

namespace Backend.Controllers
{
	[ApiController]
	[Route("api/annotations")]
	public sealed class AnnotationController : ControllerBase
	{
		private readonly IAnnotationStore _store;

		public AnnotationController(IAnnotationStore store)
		{
			_store = store;
		}

		[HttpGet("fetch")]
		public async Task<IActionResult> Fetch(
			[FromQuery] string user,
			[FromQuery] string symbol,
			CancellationToken cancellationToken = default)
		{
			if (string.IsNullOrWhiteSpace(user))
				return BadRequest("User cannot be empty.");
			if (string.IsNullOrWhiteSpace(symbol))
				return BadRequest("Symbol cannot be empty.");

			var json = await _store.GetAsync(
				user.Trim(), symbol.Trim().ToUpperInvariant(), cancellationToken);

			if (json is null)
				return Ok("[]");

			return Content(json, "application/json");
		}

		[HttpPost("save")]
		public async Task<IActionResult> Save(
			[FromQuery] string user,
			[FromQuery] string symbol,
			CancellationToken cancellationToken = default)
		{
			if (string.IsNullOrWhiteSpace(user))
				return BadRequest("User cannot be empty.");
			if (string.IsNullOrWhiteSpace(symbol))
				return BadRequest("Symbol cannot be empty.");

			using var reader = new StreamReader(Request.Body);
			string body = await reader.ReadToEndAsync(cancellationToken);

			if (string.IsNullOrWhiteSpace(body))
				return BadRequest("Request body cannot be empty.");

			await _store.UpsertAsync(
				user.Trim(), symbol.Trim().ToUpperInvariant(), body, cancellationToken);

			return Ok(new { success = true });
		}

		[HttpDelete("delete")]
		public async Task<IActionResult> Delete(
			[FromQuery] string user,
			[FromQuery] string symbol,
			CancellationToken cancellationToken = default)
		{
			if (string.IsNullOrWhiteSpace(user))
				return BadRequest("User cannot be empty.");
			if (string.IsNullOrWhiteSpace(symbol))
				return BadRequest("Symbol cannot be empty.");

			await _store.DeleteAsync(
				user.Trim(), symbol.Trim().ToUpperInvariant(), cancellationToken);

			return Ok(new { success = true });
		}
	}
}