using Domain.AggregateModel.AppAggregate;
using Domain.AggregateModel.LinkAggregate;
using Microsoft.AspNetCore.Mvc;
using QRCodeService.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using MediatR;
using QRCodeService.Application.Queries;
using QRCodeService.Application.Commands;
using QRCodeService.Infrastructure.Middlewares;
using QRCodeService.Options;
using QRCoder;
using System.Drawing;
using System.IO;
using Microsoft.Extensions.Options;

namespace QRCodeService.Controllers.Api
{
    [Route("api/v1/[controller]")]
    [ApiController]
    public class LinkController:ControllerBase
    {
        readonly IMediator mediator;
        readonly ILinkQueries linkQueries;
        readonly IOptions<ServiceOption> option;

        public LinkController(IMediator mediator, ILinkQueries queries, IOptions<ServiceOption> option)
        {
            this.mediator = mediator;
            this.linkQueries = queries;
            this.option = option;
        }
        [Route("i/{shortCode}/")]
        [HttpGet]
        public async  Task<IActionResult> GetQrCodeImage(string shortCode)
        {
            var link = await linkQueries.GetLinkAsync(shortCode);
            if (link == null)
            {
                return NotFound();
            }
            var qrCodeGenerator = new QRCodeGenerator();
            var data = qrCodeGenerator.CreateQrCode($"{option.Value.BaseUrl}r/{link.ShortCode}", QRCodeGenerator.ECCLevel.Q);
            var qrCode = new QRCode(data);
            using (var stream = new MemoryStream())
            {
                qrCode.GetGraphic(10, Color.Black, Color.White, null, 15, 6, false).Save(stream, System.Drawing.Imaging.ImageFormat.Png);
                return File(stream.ToArray(), "image/png");
            }
        }
        /// <summary>
        /// 创建二维码 如果请求头的Accept类型是image/png 则会返回二维码图片 否则返回二维码地址
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        [CheckSign]
        [HttpPost]
        public async Task<IActionResult> Create(CreateLinkModel input)
        {
            var command = new CreateLinkCommand(input.SuffixUrl,1);
            var link = await mediator.Send(command);
            if (link==null)
            {
                return BadRequest();
            }
            var accept = Request.Headers["Accept"];
            if(accept == "image/png")
            {
                var qrCodeGenerator = new QRCodeGenerator();
                var data = qrCodeGenerator.CreateQrCode($"{option.Value.BaseUrl}r/{link.ShortCode}", QRCodeGenerator.ECCLevel.Q);
                var qrCode = new QRCode(data);
                using (var stream = new MemoryStream())
                {
                    qrCode.GetGraphic(10, Color.Black, Color.White, null, 15, 6, false).Save(stream, System.Drawing.Imaging.ImageFormat.Png);
                    return File(stream.ToArray(), "image/png");
                }
            }
            return Ok($"{option.Value.BaseUrl}r/{link.ShortCode}");
        }
    }
}