using ErsatzTV.Application.MediaCollections;
using ErsatzTV.Application.MediaItems;
using ErsatzTV.Application.Search;
using ErsatzTV.Core;
using ErsatzTV.Core.Api.Scheduling;
using ErsatzTV.Core.Api.Search;
using ErsatzTV.Extensions;
using MediatR;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;

namespace ErsatzTV.Controllers.Api;

[ApiController]
public class SearchController(IMediator mediator) : ControllerBase
{
    private const int MaxPageSize = 100;

    [HttpGet("/api/v1/search", Name = "Search")]
    [Tags("Search")]
    [EndpointSummary("Search library items across all media kinds")]
    [EndpointGroupName("general")]
    [ProducesResponseType(typeof(SearchResultsResponseModel), StatusCodes.Status200OK)]
    [ProducesResponseType(typeof(ProblemDetails), StatusCodes.Status422UnprocessableEntity)]
    public async Task<IActionResult> Search(
        [FromQuery] string query = "",
        [FromQuery] int pageNum = 0,
        [FromQuery] int pageSize = 50,
        CancellationToken cancellationToken = default)
    {
        if (string.IsNullOrWhiteSpace(query))
        {
            return BaseError.New("A non-empty query is required").ToErrorResult();
        }

        int clampedPageNum = Math.Max(0, pageNum);
        int clampedPageSize = Math.Clamp(pageSize, 1, MaxPageSize);
        SearchResultsResponseModel result = await mediator.Send(
            new GetSearchResults(query, clampedPageNum, clampedPageSize),
            cancellationToken);
        return new OkObjectResult(result);
    }

    [HttpGet("/api/v1/search/all-items", Name = "SearchAllItems")]
    [Tags("Search")]
    [EndpointSummary("Search library items across all media kinds and return raw id lists")]
    [EndpointDescription(
        "Returns every matching item's id, grouped by media kind, with no paging. Used by the SPA's " +
        "\"add all to collection/playlist\" flow to materialize ids before calling the add endpoints.")]
    [EndpointGroupName("general")]
    [ProducesResponseType(typeof(SearchResultAllItemsResponseModel), StatusCodes.Status200OK)]
    [ProducesResponseType(typeof(ProblemDetails), StatusCodes.Status422UnprocessableEntity)]
    public async Task<IActionResult> SearchAllItems(
        [FromQuery] string query = "",
        CancellationToken cancellationToken = default)
    {
        if (string.IsNullOrWhiteSpace(query))
        {
            return BaseError.New("A non-empty query is required").ToErrorResult();
        }

        SearchResultAllItemsViewModel result = await mediator.Send(
            new QuerySearchIndexAllItems(query),
            cancellationToken);
        return new OkObjectResult(Project(result));
    }

    [HttpGet("/api/v1/search/collections", Name = "SearchCollections")]
    [Tags("Search")]
    [EndpointSummary("Search collections by name")]
    [EndpointDescription("Returns matching collections as {id, name} options for scheduling editors.")]
    [EndpointGroupName("general")]
    [ProducesResponseType(typeof(List<SchedulingPickerOptionResponseModel>), StatusCodes.Status200OK)]
    public async Task<List<SchedulingPickerOptionResponseModel>> SearchCollections(
        [FromQuery] string query = "",
        CancellationToken cancellationToken = default)
    {
        List<MediaCollectionViewModel> results = await mediator.Send(
            new SearchCollections(query ?? string.Empty),
            cancellationToken);
        return results.Map(c => new SchedulingPickerOptionResponseModel(c.Id, c.Name)).ToList();
    }

    [HttpGet("/api/v1/search/television-shows", Name = "SearchTelevisionShows")]
    [Tags("Search")]
    [EndpointSummary("Search television shows by name")]
    [EndpointDescription("Returns matching television shows as {id, name} options for scheduling editors.")]
    [EndpointGroupName("general")]
    [ProducesResponseType(typeof(List<SchedulingPickerOptionResponseModel>), StatusCodes.Status200OK)]
    public async Task<List<SchedulingPickerOptionResponseModel>> SearchTelevisionShows(
        [FromQuery] string query = "",
        CancellationToken cancellationToken = default)
    {
        List<NamedMediaItemViewModel> results = await mediator.Send(
            new SearchTelevisionShows(query ?? string.Empty),
            cancellationToken);
        return results.Map(s => new SchedulingPickerOptionResponseModel(s.MediaItemId, s.Name)).ToList();
    }

    [HttpGet("/api/v1/search/television-seasons", Name = "SearchTelevisionSeasons")]
    [Tags("Search")]
    [EndpointSummary("Search television seasons by name")]
    [EndpointDescription("Returns matching television seasons as {id, name} options for scheduling editors.")]
    [EndpointGroupName("general")]
    [ProducesResponseType(typeof(List<SchedulingPickerOptionResponseModel>), StatusCodes.Status200OK)]
    public async Task<List<SchedulingPickerOptionResponseModel>> SearchTelevisionSeasons(
        [FromQuery] string query = "",
        CancellationToken cancellationToken = default)
    {
        List<NamedMediaItemViewModel> results = await mediator.Send(
            new SearchTelevisionSeasons(query ?? string.Empty),
            cancellationToken);
        return results.Map(s => new SchedulingPickerOptionResponseModel(s.MediaItemId, s.Name)).ToList();
    }

    [HttpGet("/api/v1/search/smart-collections", Name = "SearchSmartCollections")]
    [Tags("Search")]
    [EndpointSummary("Search smart collections by name")]
    [EndpointDescription("Returns matching smart collections as {id, name} options for scheduling editors.")]
    [EndpointGroupName("general")]
    [ProducesResponseType(typeof(List<SchedulingPickerOptionResponseModel>), StatusCodes.Status200OK)]
    public async Task<List<SchedulingPickerOptionResponseModel>> SearchSmartCollections(
        [FromQuery] string query = "",
        CancellationToken cancellationToken = default)
    {
        List<SmartCollectionViewModel> results = await mediator.Send(
            new SearchSmartCollections(query ?? string.Empty),
            cancellationToken);
        return results.Map(c => new SchedulingPickerOptionResponseModel(c.Id, c.Name)).ToList();
    }

    [HttpGet("/api/v1/search/artists", Name = "SearchArtists")]
    [Tags("Search")]
    [EndpointSummary("Search artists by name")]
    [EndpointDescription("Returns matching artists as {id, name} options for scheduling editors.")]
    [EndpointGroupName("general")]
    [ProducesResponseType(typeof(List<SchedulingPickerOptionResponseModel>), StatusCodes.Status200OK)]
    public async Task<List<SchedulingPickerOptionResponseModel>> SearchArtists(
        [FromQuery] string query = "",
        CancellationToken cancellationToken = default)
    {
        List<NamedMediaItemViewModel> results = await mediator.Send(
            new SearchArtists(query ?? string.Empty),
            cancellationToken);
        return results.Map(a => new SchedulingPickerOptionResponseModel(a.MediaItemId, a.Name)).ToList();
    }

    [HttpGet("/api/v1/search/multi-collections", Name = "SearchMultiCollections")]
    [Tags("Search")]
    [EndpointSummary("Search multi collections by name")]
    [EndpointDescription("Returns matching multi collections as {id, name} options for scheduling editors.")]
    [EndpointGroupName("general")]
    [ProducesResponseType(typeof(List<SchedulingPickerOptionResponseModel>), StatusCodes.Status200OK)]
    public async Task<List<SchedulingPickerOptionResponseModel>> SearchMultiCollections(
        [FromQuery] string query = "",
        CancellationToken cancellationToken = default)
    {
        List<MultiCollectionViewModel> results = await mediator.Send(
            new SearchMultiCollections(query ?? string.Empty),
            cancellationToken);
        return results.Map(c => new SchedulingPickerOptionResponseModel(c.Id, c.Name)).ToList();
    }

    private static SearchResultAllItemsResponseModel Project(SearchResultAllItemsViewModel vm) =>
        new(
            vm.MovieIds,
            vm.ShowIds,
            vm.SeasonIds,
            vm.EpisodeIds,
            vm.ArtistIds,
            vm.MusicVideoIds,
            vm.OtherVideoIds,
            vm.SongIds,
            vm.ImageIds,
            vm.RemoteStreamIds);
}