using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Threading.Tasks;
using API.Constants;
using API.Data;
using API.DTOs;
using API.DTOs.Filtering;
using API.DTOs.Metadata;
using API.DTOs.SeriesDetail;
using API.Entities.Enums;
using API.Extensions;
using API.Services;
using API.Services.Plus;
using Kavita.Common.Extensions;
using Microsoft.AspNetCore.Mvc;

namespace API.Controllers;

#nullable enable

public class MetadataController(IUnitOfWork unitOfWork, ILocalizationService localizationService, ILicenseService licenseService,
    IRatingService ratingService, IReviewService reviewService, IRecommendationService recommendationService, IExternalMetadataService metadataService)
    : BaseApiController
{
    /// <summary>
    /// Fetches genres from the instance
    /// </summary>
    /// <param name="libraryIds">String separated libraryIds or null for all genres</param>
    /// <returns></returns>
    [HttpGet("genres")]
    [ResponseCache(CacheProfileName = ResponseCacheProfiles.Instant, VaryByQueryKeys = new []{"libraryIds"})]
    public async Task<ActionResult<IList<GenreTagDto>>> GetAllGenres(string? libraryIds)
    {
        var ids = libraryIds?.Split(',', StringSplitOptions.TrimEntries | StringSplitOptions.RemoveEmptyEntries).Select(int.Parse).ToList();
        if (ids != null && ids.Count > 0)
        {
            return Ok(await unitOfWork.GenreRepository.GetAllGenreDtosForLibrariesAsync(ids, User.GetUserId()));
        }

        return Ok(await unitOfWork.GenreRepository.GetAllGenreDtosAsync(User.GetUserId()));
    }

    /// <summary>
    /// Fetches people from the instance by role
    /// </summary>
    /// <param name="role">role</param>
    /// <returns></returns>
    [HttpGet("people-by-role")]
    [ResponseCache(CacheProfileName = ResponseCacheProfiles.Instant, VaryByQueryKeys = new []{"role"})]
    public async Task<ActionResult<IList<PersonDto>>> GetAllPeople(PersonRole? role)
    {
        return role.HasValue ?
            Ok(await unitOfWork.PersonRepository.GetAllPersonDtosByRoleAsync(User.GetUserId(), role!.Value)) :
            Ok(await unitOfWork.PersonRepository.GetAllPersonDtosAsync(User.GetUserId()));
    }

    /// <summary>
    /// Fetches people from the instance
    /// </summary>
    /// <param name="libraryIds">String separated libraryIds or null for all people</param>
    /// <returns></returns>
    [HttpGet("people")]
    [ResponseCache(CacheProfileName = ResponseCacheProfiles.Instant, VaryByQueryKeys = new []{"libraryIds"})]
    public async Task<ActionResult<IList<PersonDto>>> GetAllPeople(string? libraryIds)
    {
        var ids = libraryIds?.Split(',', StringSplitOptions.TrimEntries | StringSplitOptions.RemoveEmptyEntries).Select(int.Parse).ToList();
        if (ids != null && ids.Count > 0)
        {
            return Ok(await unitOfWork.PersonRepository.GetAllPeopleDtosForLibrariesAsync(ids, User.GetUserId()));
        }
        return Ok(await unitOfWork.PersonRepository.GetAllPersonDtosAsync(User.GetUserId()));
    }

    /// <summary>
    /// Fetches all tags from the instance
    /// </summary>
    /// <param name="libraryIds">String separated libraryIds or null for all tags</param>
    /// <returns></returns>
    [HttpGet("tags")]
    [ResponseCache(CacheProfileName = ResponseCacheProfiles.Instant, VaryByQueryKeys = new []{"libraryIds"})]
    public async Task<ActionResult<IList<TagDto>>> GetAllTags(string? libraryIds)
    {
        var ids = libraryIds?.Split(',', StringSplitOptions.TrimEntries | StringSplitOptions.RemoveEmptyEntries).Select(int.Parse).ToList();
        if (ids != null && ids.Count > 0)
        {
            return Ok(await unitOfWork.TagRepository.GetAllTagDtosForLibrariesAsync(ids, User.GetUserId()));
        }
        return Ok(await unitOfWork.TagRepository.GetAllTagDtosAsync(User.GetUserId()));
    }

    /// <summary>
    /// Fetches all age ratings from the instance
    /// </summary>
    /// <param name="libraryIds">String separated libraryIds or null for all ratings</param>
    /// <remarks>This API is cached for 1 hour, varying by libraryIds</remarks>
    /// <returns></returns>
    [ResponseCache(CacheProfileName = ResponseCacheProfiles.FiveMinute, VaryByQueryKeys = new [] {"libraryIds"})]
    [HttpGet("age-ratings")]
    public async Task<ActionResult<IList<AgeRatingDto>>> GetAllAgeRatings(string? libraryIds)
    {
        var ids = libraryIds?.Split(',', StringSplitOptions.TrimEntries | StringSplitOptions.RemoveEmptyEntries).Select(int.Parse).ToList();
        if (ids != null && ids.Count > 0)
        {
            return Ok(await unitOfWork.LibraryRepository.GetAllAgeRatingsDtosForLibrariesAsync(ids));
        }

        return Ok(Enum.GetValues<AgeRating>().Select(t => new AgeRatingDto()
        {
            Title = t.ToDescription(),
            Value = t
        }).Where(r => r.Value > AgeRating.NotApplicable));
    }

    /// <summary>
    /// Fetches all publication status' from the instance
    /// </summary>
    /// <param name="libraryIds">String separated libraryIds or null for all publication status</param>
    /// <remarks>This API is cached for 1 hour, varying by libraryIds</remarks>
    /// <returns></returns>
    [ResponseCache(CacheProfileName = ResponseCacheProfiles.FiveMinute, VaryByQueryKeys = new [] {"libraryIds"})]
    [HttpGet("publication-status")]
    public ActionResult<IList<AgeRatingDto>> GetAllPublicationStatus(string? libraryIds)
    {
        var ids = libraryIds?.Split(',', StringSplitOptions.TrimEntries | StringSplitOptions.RemoveEmptyEntries).Select(int.Parse).ToList();
        if (ids is {Count: > 0})
        {
            return Ok(unitOfWork.LibraryRepository.GetAllPublicationStatusesDtosForLibrariesAsync(ids));
        }

        return Ok(Enum.GetValues<PublicationStatus>().Select(t => new PublicationStatusDto()
        {
            Title = t.ToDescription(),
            Value = t
        }).OrderBy(t => t.Title));
    }

    /// <summary>
    /// Fetches all age languages from the libraries passed (or if none passed, all in the server)
    /// </summary>
    /// <remarks>This does not perform RBS for the user if they have Library access due to the non-sensitive nature of languages</remarks>
    /// <param name="libraryIds">String separated libraryIds or null for all ratings</param>
    /// <returns></returns>
    [HttpGet("languages")]
    [ResponseCache(CacheProfileName = ResponseCacheProfiles.FiveMinute, VaryByQueryKeys = new []{"libraryIds"})]
    public async Task<ActionResult<IList<LanguageDto>>> GetAllLanguages(string? libraryIds)
    {
        var ids = libraryIds?.Split(',', StringSplitOptions.TrimEntries | StringSplitOptions.RemoveEmptyEntries).Select(int.Parse).ToList();
        return Ok(await unitOfWork.LibraryRepository.GetAllLanguagesForLibrariesAsync(ids));
    }

    /// <summary>
    /// Returns all languages Kavita can accept
    /// </summary>
    /// <returns></returns>
    [HttpGet("all-languages")]
    [ResponseCache(CacheProfileName = ResponseCacheProfiles.Hour)]
    public IEnumerable<LanguageDto> GetAllValidLanguages()
    {
        return CultureInfo.GetCultures(CultureTypes.AllCultures).Select(c =>
            new LanguageDto()
            {
                Title = c.DisplayName,
                IsoCode = c.IetfLanguageTag
            }).Where(l => !string.IsNullOrEmpty(l.IsoCode));
    }


    /// <summary>
    /// Returns summary for the chapter
    /// </summary>
    /// <param name="chapterId"></param>
    /// <returns></returns>
    [HttpGet("chapter-summary")]
    public async Task<ActionResult<string>> GetChapterSummary(int chapterId)
    {
        if (chapterId <= 0) return BadRequest(await localizationService.Translate(User.GetUserId(), "chapter-doesnt-exist"));
        var chapter = await unitOfWork.ChapterRepository.GetChapterAsync(chapterId);
        if (chapter == null) return BadRequest(await localizationService.Translate(User.GetUserId(), "chapter-doesnt-exist"));
        return Ok(chapter.Summary);
    }

    /// <summary>
    /// Fetches the details needed from Kavita+ for Series Detail page
    /// </summary>
    /// <param name="seriesId"></param>
    /// <returns></returns>
    [HttpGet("series-detail-plus")]
    [ResponseCache(CacheProfileName = ResponseCacheProfiles.KavitaPlus, VaryByQueryKeys = ["seriesId"])]
    public async Task<ActionResult<SeriesDetailPlusDto>> GetKavitaPlusSeriesDetailData(int seriesId)
    {
        var seriesDetail = new SeriesDetailPlusDto();
        if (!await licenseService.HasActiveLicense())
        {
            seriesDetail.Recommendations = null;
            seriesDetail.Ratings = Enumerable.Empty<RatingDto>();
            return Ok(seriesDetail);
        }

        seriesDetail = await metadataService.GetSeriesDetail(User.GetUserId(), seriesId);

        // Temp solution, needs to be updated with new API
        // seriesDetail.Ratings = await ratingService.GetRatings(seriesId);
        // seriesDetail.Reviews = await reviewService.GetReviewsForSeries(User.GetUserId(), seriesId);
        // seriesDetail.Recommendations =
        //     await recommendationService.GetRecommendationsForSeries(User.GetUserId(), seriesId);

        return Ok(seriesDetail);

    }
}