using MediatR;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Options;
using Mirea.Api.DataAccess.Application.Cqrs.Schedule.Queries.GetScheduleList;
using Mirea.Api.Dto.Common;
using Mirea.Api.Dto.Requests;
using Mirea.Api.Dto.Responses;
using Mirea.Api.Endpoint.Common.Attributes;
using Mirea.Api.Endpoint.Common.Services;
using Mirea.Api.Endpoint.Configuration.General;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace Mirea.Api.Endpoint.Controllers.V1;

[ApiVersion("1.0")]
public class ScheduleController(IMediator mediator, IOptionsSnapshot<GeneralConfig> config) : BaseController
{
    [HttpGet("StartTerm")]
    public ActionResult<DateOnly> GetStartTerm() => config.Value.ScheduleSettings!.StartTerm;

    [HttpGet("PairPeriod")]
    public ActionResult<Dictionary<int, PairPeriodTime>> GetPairPeriod() => config.Value.ScheduleSettings!.PairPeriod.ConvertToDto();

    /// <summary>
    /// Retrieves schedules based on various filters.
    /// </summary>
    /// <param name="request">The request object containing filter criteria.</param>
    /// <returns>A list of schedules matching the filter criteria.</returns>
    [HttpPost]
    [ProducesResponseType(StatusCodes.Status200OK)]
    [ProducesResponseType(StatusCodes.Status204NoContent)]
    [BadRequestResponse]
    [NotFoundResponse]
    public async Task<ActionResult<List<ScheduleResponse>>> Get([FromBody] ScheduleRequest request)
    {
        if ((request.Groups == null || request.Groups.Length == 0) &&
            (request.Disciplines == null || request.Disciplines.Length == 0) &&
            (request.Professors == null || request.Professors.Length == 0) &&
            (request.LectureHalls == null || request.LectureHalls.Length == 0))
        {
            return BadRequest(new ErrorResponse()
            {
                Error = "At least one of the arguments must be selected."
                        + (request.IsEven.HasValue
                            ? $" \"{nameof(request.IsEven)}\" is not a strong argument"
                            : string.Empty),
                Code = StatusCodes.Status400BadRequest
            });
        }

        var result = (await mediator.Send(new GetScheduleListQuery
        {
            IsEven = request.IsEven,
            DisciplineIds = request.Disciplines,
            GroupIds = request.Groups,
            LectureHallIds = request.LectureHalls,
            ProfessorIds = request.Professors
        })).Schedules;

        if (result.Count == 0) NoContent();

        return Ok(result.Select(s => new ScheduleResponse
        {
            DayOfWeek = s.DayOfWeek,
            PairNumber = s.PairNumber,
            IsEven = s.IsEven,
            Discipline = s.Discipline,
            DisciplineId = s.DisciplineId,
            IsExcludedWeeks = s.IsExcludedWeeks,
            Weeks = s.Weeks,
            TypeOfOccupations = s.TypeOfOccupations,
            Group = s.Group,
            GroupId = s.GroupId,
            LectureHalls = s.LectureHalls,
            LectureHallsId = s.LectureHallsId,
            Professors = s.Professors,
            ProfessorsId = s.ProfessorsId,
            Campus = s.Campus,
            CampusId = s.CampusId,
            LinkToMeet = s.LinkToMeet
        }));
    }

    /// <summary>
    /// Retrieves schedules for a specific group based on various filters.
    /// </summary>
    /// <param name="id">The ID of the group.</param>
    /// <param name="isEven">A value indicating whether to retrieve schedules for even weeks.</param>
    /// <param name="disciplines">An array of discipline IDs.</param>
    /// <param name="professors">An array of professor IDs.</param>
    /// <param name="lectureHalls">An array of lecture hall IDs.</param>
    /// <returns>A response containing schedules for the specified group.</returns>
    [HttpGet("GetByGroup/{id:int}")]
    [ProducesResponseType(StatusCodes.Status200OK)]
    [ProducesResponseType(StatusCodes.Status204NoContent)]
    [BadRequestResponse]
    [NotFoundResponse]
    public async Task<ActionResult<List<ScheduleResponse>>> GetByGroup(int id,
        [FromQuery] bool? isEven = null,
        [FromQuery] int[]? disciplines = null,
        [FromQuery] int[]? professors = null,
        [FromQuery] int[]? lectureHalls = null) =>
        await Get(new ScheduleRequest
    {
            Disciplines = disciplines,
            IsEven = isEven,
            Groups = [id],
            Professors = professors,
            LectureHalls = lectureHalls
        });

    /// <summary>
    /// Retrieves schedules for a specific professor based on various filters.
    /// </summary>
    /// <param name="id">The ID of the professor.</param>
    /// <param name="isEven">A value indicating whether to retrieve schedules for even weeks.</param>
    /// <param name="disciplines">An array of discipline IDs.</param>
    /// <param name="groups">An array of group IDs.</param>
    /// <param name="lectureHalls">An array of lecture hall IDs.</param>
    /// <returns>A response containing schedules for the specified professor.</returns>
    [HttpGet("GetByProfessor/{id:int}")]
    [ProducesResponseType(StatusCodes.Status200OK)]
    [ProducesResponseType(StatusCodes.Status204NoContent)]
    [BadRequestResponse]
    [NotFoundResponse]
    public async Task<ActionResult<List<ScheduleResponse>>> GetByProfessor(int id,
        [FromQuery] bool? isEven = null,
        [FromQuery] int[]? disciplines = null,
        [FromQuery] int[]? groups = null,
        [FromQuery] int[]? lectureHalls = null) =>
        await Get(new ScheduleRequest
    {
            Disciplines = disciplines,
            IsEven = isEven,
            Groups = groups,
            Professors = [id],
            LectureHalls = lectureHalls
        });

    /// <summary>
    /// Retrieves schedules for a specific lecture hall based on various filters.
    /// </summary>
    /// <param name="id">The ID of the lecture hall.</param>
    /// <param name="isEven">A value indicating whether to retrieve schedules for even weeks.</param>
    /// <param name="disciplines">An array of discipline IDs.</param>
    /// <param name="professors">An array of professor IDs.</param>
    /// <param name="groups">An array of group IDs.</param>
    /// <returns>A response containing schedules for the specified lecture hall.</returns>
    [HttpGet("GetByLectureHall/{id:int}")]
    [ProducesResponseType(StatusCodes.Status200OK)]
    [ProducesResponseType(StatusCodes.Status204NoContent)]
    [BadRequestResponse]
    [NotFoundResponse]
    public async Task<ActionResult<List<ScheduleResponse>>> GetByLectureHall(int id,
        [FromQuery] bool? isEven = null,
        [FromQuery] int[]? disciplines = null,
        [FromQuery] int[]? groups = null,
        [FromQuery] int[]? professors = null) =>
        await Get(new ScheduleRequest
    {
            Disciplines = disciplines,
            IsEven = isEven,
            Groups = groups,
            Professors = professors,
            LectureHalls = [id]
        });

    /// <summary>
    /// Retrieves schedules for a specific discipline based on various filters.
    /// </summary>
    /// <param name="id">The ID of the discipline.</param>
    /// <param name="isEven">A value indicating whether to retrieve schedules for even weeks.</param>
    /// <param name="groups">An array of group IDs.</param>
    /// <param name="professors">An array of professor IDs.</param>
    /// <param name="lectureHalls">An array of lecture hall IDs.</param>
    /// <returns>A response containing schedules for the specified discipline.</returns>
    [HttpGet("GetByDiscipline/{id:int}")]
    [ProducesResponseType(StatusCodes.Status200OK)]
    [ProducesResponseType(StatusCodes.Status204NoContent)]
    [BadRequestResponse]
    [NotFoundResponse]
    public async Task<ActionResult<List<ScheduleResponse>>> GetByDiscipline(int id,
        [FromQuery] bool? isEven = null,
        [FromQuery] int[]? groups = null,
        [FromQuery] int[]? professors = null,
        [FromQuery] int[]? lectureHalls = null) =>
        await Get(new ScheduleRequest
    {
            Disciplines = [id],
            IsEven = isEven,
            Groups = groups,
            Professors = professors,
            LectureHalls = lectureHalls
        });
    }