using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace MTP_UManager
{
    static class DataManipulator
    {
        // Initializating.
        public static Person user;

        public static void Login()
        {
            string username = "",
                password = "";

            Console.Write("Пользователь: ");
            username = Console.ReadLine();
            Console.WriteLine();

            Console.Write("Пароль: ");
            password = Console.ReadLine();

            DataGetter.GetLoginedUserFromDatabase(username, password);
        }

        public static void SetUpCurrentUser(string username) /**/
        {
            string[] userData = Database.GetTheUserFromDatabase(username,
                out List<string> coursesUserTook, out List<string> coursesUserSee, out List<string> coursesUserEnded);

            string status = userData[1];
            if (status == "student")
            {
                user = new Student(username, "студент")
                {
                    AvailableCoursesID = coursesUserSee,
                    TakenCoursesID = coursesUserTook,
                    FinishedCoursesID = coursesUserEnded
                };
            }
            else if (/*Status is teacher*/ false)
            {
                //TODO
            }
            else if (/*Status is rector*/false)
            {
                //TODO
            }

            Renderer.RenderMainPage(user);
        }

        // Main Page Menu.
        public static void CheckUserChoiceInMainPageMenu(Student user, string userChoice)
        {
            switch (userChoice)
            {
                case "1":
                    Renderer.RenderCoursesListPage(user);
                    break;
                case "2":
                    Renderer.RenderStudentStatsPage(user);
                    break;
                case "3":
                    Quit();
                    break;
                default:
                    Renderer.RenderMainPageMessage(user);
                    CheckUserChoiceInMainPageMenu(user, Renderer.RenderMenu(DataGetter.GetMainPageMenuItems()));//
                    break;
            }
        }

        // Course List Page.
        public static void CheckUserChoiceInCoursesListPageMenu(Student user, string userChoice)
        {
            switch (userChoice)
            {
                case "1":
                    Renderer.RenderSignUpForCoursePageMessage(user);
                    CheckUserChoiceInMainPageMenu(user, Renderer.RenderMenu(DataGetter.GetMainPageMenuItems()));
                    break;
                case "2":
                    Renderer.RenderLeaveCoursePageMessage(user);
                    CheckUserChoiceInMainPageMenu(user, Renderer.RenderMenu(DataGetter.GetMainPageMenuItems()));
                    break;
                case "3":
                    Renderer.RenderMainPageMessage(user);
                    CheckUserChoiceInMainPageMenu(user, Renderer.RenderMenu(DataGetter.GetMainPageMenuItems()));
                    break;
                default:
                    Renderer.RenderCoursesListPage(user);
                    break;
            }
        }

        public static void SignUpForCourse(Student user, string courseID)
        {
            if ((!user.FinishedCoursesID.Contains(courseID)) && (!user.TakenCoursesID.Contains(courseID)))
                user.TakenCoursesID.Add(courseID);
        }

        public static void LeaveCourse(Student user, string courseID)
        {
            user.TakenCoursesID.Remove(courseID);
        }

        public static void Quit()
        {
            Renderer.RenderLoginPageMessage();
        }

        // Course Student Stats.
        public static void CheckUserChoiceInStudentStatsPageMenu(Student user, string userChoice)
        {
            switch (userChoice)
            {
                case "1":
                    Renderer.RenderStudentStatsPageMessage(user);
                    CheckUserChoiceInMainPageMenu(user, Renderer.RenderMenu(DataGetter.GetMainPageMenuItems()));
                    break;
                default:
                    Renderer.RenderStudentStatsPage(user);
                    break;
            }
        }
    }
}