using System;
using System.Globalization;
using System.Threading.Tasks;
using DouyinApi.Controllers;
using DouyinApi.IServices;
using DouyinApi.Model.Naming;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Logging;

namespace DouyinApi.Api.Controllers.MiniProgram
{
    [Produces("application/json")]
    [Route("api/naming")]
    [AllowAnonymous]
    public class NamingController : BaseApiController
    {
        private readonly INamingService _namingService;
        private readonly ILogger<NamingController> _logger;

        public NamingController(INamingService namingService, ILogger<NamingController> logger)
        {
            _namingService = namingService;
            _logger = logger;
        }

        [HttpPost("validate-surname")]
        public async Task<IActionResult> ValidateSurname([FromBody] SurnameValidationRequest request)
        {
            if (!ModelState.IsValid)
            {
                return Ok(new { isValid = false, message = "请输入合法姓氏" });
            }

            var surname = request.Surname?.Trim() ?? string.Empty;
            var isValid = await _namingService.ValidateSurnameAsync(surname);
            return Ok(new
            {
                isValid,
                message = isValid ? string.Empty : "请输入合法姓氏"
            });
        }

        [HttpPost("generate")]
        public async Task<IActionResult> Generate([FromBody] NamingRequest request)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(new { message = "参数不合法" });
            }

            var normalizedRequest = NormalizeRequest(request);

            try
            {
                var response = await _namingService.GenerateNamesAsync(normalizedRequest);
                return Ok(new
                {
                    analysis = response.Analysis,
                    results = response.Results
                });
            }
            catch (ArgumentException ex) when (ex.Message == "invalid_surname")
            {
                return BadRequest(new { message = "INVALID_SURNAME" });
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "Generate naming failed");
                return StatusCode(500, new { message = "GENERATION_FAILED" });
            }
        }

        private static NamingRequest NormalizeRequest(NamingRequest request)
        {
            var normalized = new NamingRequest
            {
                Surname = request.Surname?.Trim() ?? string.Empty,
                Gender = string.IsNullOrWhiteSpace(request.Gender) ? "male" : request.Gender.Trim().ToLowerInvariant(),
                NameLength = string.IsNullOrWhiteSpace(request.NameLength) ? "double" : request.NameLength.Trim().ToLowerInvariant(),
                BirthDate = NormalizeDate(request.BirthDate),
                BirthTime = NormalizeTime(request.BirthTime)
            };

            return normalized;
        }

        private static string NormalizeDate(string date)
        {
            if (string.IsNullOrWhiteSpace(date))
            {
                return DateTime.UtcNow.ToString("yyyy-MM-dd", CultureInfo.InvariantCulture);
            }

            if (DateTime.TryParse(date, out var parsed))
            {
                return parsed.ToString("yyyy-MM-dd", CultureInfo.InvariantCulture);
            }

            return date;
        }

        private static string NormalizeTime(string time)
        {
            if (string.IsNullOrWhiteSpace(time))
            {
                return string.Empty;
            }

            if (TimeSpan.TryParse(time, out var parsed))
            {
                return DateTime.Today.Add(parsed).ToString("HH:mm", CultureInfo.InvariantCulture);
            }

            return time;
        }
    }
}