using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using API.Data;
using API.DTOs.CollectionTags;
using API.Entities.Metadata;
using API.Extensions;
using API.Services;
using API.Services.Tasks.Metadata;
using API.SignalR;
using Kavita.Common;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;

namespace API.Controllers;

/// <summary>
/// APIs for Collections
/// </summary>
public class CollectionController : BaseApiController
{
    private readonly IUnitOfWork _unitOfWork;
    private readonly ICollectionTagService _collectionService;

    /// <inheritdoc />
    public CollectionController(IUnitOfWork unitOfWork, ICollectionTagService collectionService)
    {
        _unitOfWork = unitOfWork;
        _collectionService = collectionService;
    }

    /// <summary>
    /// Return a list of all collection tags on the server
    /// </summary>
    /// <returns></returns>
    [HttpGet]
    public async Task<IEnumerable<CollectionTagDto>> GetAllTags()
    {
        var user = await _unitOfWork.UserRepository.GetUserByUsernameAsync(User.GetUsername());
        var isAdmin = await _unitOfWork.UserRepository.IsUserAdminAsync(user);
        if (isAdmin)
        {
            return await _unitOfWork.CollectionTagRepository.GetAllTagDtosAsync();
        }

        return await _unitOfWork.CollectionTagRepository.GetAllPromotedTagDtosAsync(user.Id);
    }

    /// <summary>
    /// Searches against the collection tags on the DB and returns matches that meet the search criteria.
    /// <remarks>Search strings will be cleaned of certain fields, like %</remarks>
    /// </summary>
    /// <param name="queryString">Search term</param>
    /// <returns></returns>
    [Authorize(Policy = "RequireAdminRole")]
    [HttpGet("search")]
    public async Task<IEnumerable<CollectionTagDto>> SearchTags(string queryString)
    {
        queryString ??= string.Empty;
        queryString = queryString.Replace(@"%", string.Empty);
        if (queryString.Length == 0) return await GetAllTags();

        return await _unitOfWork.CollectionTagRepository.SearchTagDtosAsync(queryString, User.GetUserId());
    }

    /// <summary>
    /// Checks if a collection exists with the name
    /// </summary>
    /// <param name="name">If empty or null, will return true as that is invalid</param>
    /// <returns></returns>
    [Authorize(Policy = "RequireAdminRole")]
    [HttpGet("name-exists")]
    public async Task<ActionResult<bool>> DoesNameExists(string name)
    {
        return Ok(await _collectionService.TagExistsByName(name));
    }

    /// <summary>
    /// Updates an existing tag with a new title, promotion status, and summary.
    /// <remarks>UI does not contain controls to update title</remarks>
    /// </summary>
    /// <param name="updatedTag"></param>
    /// <returns></returns>
    [Authorize(Policy = "RequireAdminRole")]
    [HttpPost("update")]
    public async Task<ActionResult> UpdateTag(CollectionTagDto updatedTag)
    {
        try
        {
            if (await _collectionService.UpdateTag(updatedTag)) return Ok("Tag updated successfully");
        }
        catch (KavitaException ex)
        {
            return BadRequest(ex.Message);
        }

        return BadRequest("Something went wrong, please try again");
    }

    /// <summary>
    /// Adds a collection tag onto multiple Series. If tag id is 0, this will create a new tag.
    /// </summary>
    /// <param name="dto"></param>
    /// <returns></returns>
    [Authorize(Policy = "RequireAdminRole")]
    [HttpPost("update-for-series")]
    public async Task<ActionResult> AddToMultipleSeries(CollectionTagBulkAddDto dto)
    {
        // Create a new tag and save
        var tag = await _collectionService.GetTagOrCreate(dto.CollectionTagId, dto.CollectionTagTitle);

        if (await _collectionService.AddTagToSeries(tag, dto.SeriesIds)) return Ok();

        return BadRequest("There was an issue updating series with collection tag");
    }

    /// <summary>
    /// For a given tag, update the summary if summary has changed and remove a set of series from the tag.
    /// </summary>
    /// <param name="updateSeriesForTagDto"></param>
    /// <returns></returns>
    [Authorize(Policy = "RequireAdminRole")]
    [HttpPost("update-series")]
    public async Task<ActionResult> RemoveTagFromMultipleSeries(UpdateSeriesForTagDto updateSeriesForTagDto)
    {
        try
        {
            var tag = await _unitOfWork.CollectionTagRepository.GetFullTagAsync(updateSeriesForTagDto.Tag.Id);
            if (tag == null) return BadRequest("Not a valid Tag");
            tag.SeriesMetadatas ??= new List<SeriesMetadata>();

            if (await _collectionService.RemoveTagFromSeries(tag, updateSeriesForTagDto.SeriesIdsToRemove))
                return Ok("Tag updated");
        }
        catch (Exception)
        {
            await _unitOfWork.RollbackAsync();
        }


        return BadRequest("Something went wrong. Please try again.");
    }
}