using _2021_backend.Models;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using Microsoft.EntityFrameworkCore;
using System;
using System.IO.Compression;
using System.Collections.Generic;
using System.Linq;
using _2021_backend.Utils;
using System.Threading.Tasks;

namespace _2021_backend.Pages.Students
{
    public class IndexModel : PageModel
    {
        private readonly _2021_backend.Data.BackendContext Context;
        public static int PageSize { get; set; }
        public int PageCount { get; set; }
        public int PageId { get; set; }
        public string errmsg { get; set; }

        [BindProperty(SupportsGet = true)]
        public string SearchString { get; set; }
        [BindProperty(SupportsGet = true)]
        public grade Grade { get; set; }

        [BindProperty(SupportsGet = true)]
        public string SearchQQ {  get; set; }

        [BindProperty(SupportsGet = true)]
        public string SearchTel {  get; set; }

        [BindProperty(SupportsGet = true)]
        public status StatusSel { get; set; } = status.暂缺;



        public IndexModel(_2021_backend.Data.BackendContext context)
        {
            Context = context;
        }

        public List<Student> Student { get; set; }
        public IActionResult Construct(int pageId, string errInfo)
        {
            PageSize = 30;
            if (string.IsNullOrEmpty(errInfo))
            {
                errmsg = "";
            }
            else
            {
                errmsg = errInfo;
            }
            if (pageId == null) pageId = 0;
            IQueryable<Student> q;
            if (!string.IsNullOrEmpty(SearchString))
            {
                q = Context.Students.Where(s => (s.Name.Contains(SearchString) || s.Stuid.Contains(SearchString)));
            }
            else
            {
                q = Context.Students;
            }
            if (Grade != grade.暂缺) q = q.Where(it => it.Grade == Grade);
            if (StatusSel != status.暂缺) q = q.Where(it => it.Status == StatusSel);
            if (!String.IsNullOrEmpty(SearchTel)) q = q.Where(it => it.Tel.Contains(SearchTel));
            if (!String.IsNullOrEmpty(SearchQQ)) q = q.Where(it => it.Email.Contains(SearchQQ));
            Student = q.ToList();
            
            Student.Sort((Student a, Student b) =>
            {
                return -a.RegisterTime.CompareTo(b.RegisterTime);
            });
            int cnt = Student.Count;
            PageCount = (int)Math.Ceiling((double)cnt / (double)PageSize);
            if (pageId >= PageCount) pageId = PageCount - 1;
            if (pageId < 0) pageId = 0;
            PageId = (int)pageId;
            int count = (PageId + 1) * PageSize > cnt ? (cnt - PageId * PageSize) : PageSize;
            Student = Student.GetRange(PageId * PageSize, count);
            return Page();
        }

        public async Task<IActionResult> OnGetAsync(int? pageId, string errInfo)
        {
            if (pageId == null) pageId = 0;
            return Construct((int)pageId, errInfo);
        }

        public async Task<IActionResult> OnPostAsync(int? pageId, string errInfo)
        {
            if (pageId == null) pageId = 0;
            return Construct((int)pageId, errInfo);
        }
    }
}