using _2021_backend.Data;
using _2021_backend.Models;
using _2021_backend.Utils;
using Microsoft.AspNetCore.Mvc;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.Json;
using System.Threading.Tasks;

namespace _2021_backend.Controllers
{
    [Route("api/submit")]
    public class SubmissionController : Controller
    {
        public BackendContext Context;

        public SubmissionController(BackendContext context)
        {
            Context = context;
        }
        [HttpPost]
        public async Task<IActionResult> Post([FromForm] string dto)
        {
            var aDto = JsonSerializer.Deserialize<SubmissionDto>(dto);
            string ip = Request.Headers["X-Real-IP"].FirstOrDefault();
            if (aDto.Iscomplete() == false)
                return StatusCode(400, ApiResponse.Error("TICKET_INFO_INCOMPLETE"));
            if (aDto.Check() == false)
                return StatusCode(400, ApiResponse.Error("TICKET_NOT_LEGEAL"));
            Submission sub = new Submission(aDto, ip);
            foreach (var tm in Context.Sessions)
            {
                if(aDto.Timelist != null)if (aDto.Timelist.Any(it => it.Day.Day == tm.Day.Day && it.BeginTime.TimeOfDay == tm.BeginTime.TimeOfDay))
                {
                    sub.Timelist.Add(tm.Id);
                }
            }
            var q = Context.Students.Where(stu => (stu.Name == aDto.Name || stu.Stuid == aDto.Stuid));
            Student stu;
            if (q.Count() == 0)
            {
                stu = Student.create(sub);
                stu.Status = status.刚报名;
                Context.Students.Add(stu);
            }
            else
            {
                stu = q.FirstOrDefault();
                stu.Update(sub);
            }
            sub.Host = stu.Id;
            Context.Submissions.Add(sub);
            Context.SaveChanges();
            await TencentSMS.Send(Context, SMSType.Signed, stu, _2021_backend.Models.User.Bot.stuID);
            return Ok(ApiResponse.Success("success"));

        }
    }
    [ApiController]
    [Route("api/sessionlist")]
    public class SessionlistContoller : Controller
    {
        private readonly BackendContext _context;
        public SessionlistContoller(BackendContext context)
        {
            _context = context;
        }
        [HttpGet]

        public IActionResult GetSessions()
        {
            var query = _context.Sessions.OrderBy(r => r.Day).ThenBy(r => r.BeginTime).ThenBy(r => r.Place).Where(e => e.Capacity > e.Students.Count).Select(r => new SessionDto
            {
                BeginTime = r.BeginTime,
                Day = r.Day,
            });
            return Ok(ApiResponse.Success(query.ToList().FindAll(it => it.Day.Add(it.BeginTime.TimeOfDay).CompareTo(DateTime.Now) > 0).Distinct(new SessionDtoComparer()).ToList()));
            //return Ok(ApiResponse.Success("报名结束了"));
        }
    }

    [ApiController]
    [Route("api/postsession")]
    public class PostsessionController : Controller
    {
        private readonly BackendContext Context;
        public PostsessionController(BackendContext context)
        {
            Context = context;
        }
        [HttpPost]

        public async Task<IActionResult> Post([FromQuery] string stuid, [FromQuery] string selection)
        {
            Student stu = Context.Students.FirstOrDefault(r => r.Stuid == stuid);
            if (stu == null)
            {
                return StatusCode(400, ApiResponse.Error("INVALID_STUDENT_int"));
            }
            SessionDto time;
            try
            {
                time = JsonSerializer.Deserialize<SessionDto>(selection);
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex);
                return StatusCode(400, ApiResponse.Error("MALFORMED_DATA"));
            };
            //get the selected session ints;
            int targetSession = 0;
            var sessions = Context.Sessions.ToList();
            var s = sessions.Find((Session s) =>
            {
                return time.Day == s.Day && time.BeginTime == s.BeginTime;
            });
            var overwritten = false;
            if (s.Students.Count >= s.Capacity) return Ok(ApiResponse.Error("OUT_OF_CAPACITY"));
            if (Context.Sessions.Find(stu.InterviewTime) != null)
            {
                var olds = Context.Sessions.Find(stu.InterviewTime);
                olds.Students.Remove(stu.Id);
                Context.SaveChanges();
                overwritten = true;
            }
            targetSession = s.Id;
            s.Students.Add(stu.Id);
            stu.Timelist = new List<int> { targetSession};
            stu.Status = status.已选时间;
            stu.InterviewTime = s.Id;
            await TencentSMS.Send(Context, SMSType.TimeSet, stu, "smsbot");
            Context.SaveChanges();
            if (overwritten) return Ok(ApiResponse.Success("overwritten"));
            return Ok(ApiResponse.Success("success"));
            //return Ok(ApiResponse.Success("报名结束了"));

        }
    }
}