using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Moonlight.Api.Database;
using Moonlight.Api.Database.Entities;
using Moonlight.Api.Mappers;
using Moonlight.Api.Services;
using Moonlight.Shared;
using Moonlight.Shared.Http.Requests;
using Moonlight.Shared.Http.Requests.Admin.Themes;
using Moonlight.Shared.Http.Responses;
using Moonlight.Shared.Http.Responses.Admin.Themes;

namespace Moonlight.Api.Http.Controllers.Admin;

[ApiController]
[Route("api/admin/themes")]
public class ThemesController : Controller
{
    private readonly DatabaseRepository<Theme> ThemeRepository;
    private readonly FrontendService FrontendService;

    public ThemesController(DatabaseRepository<Theme> themeRepository, FrontendService frontendService)
    {
        ThemeRepository = themeRepository;
        FrontendService = frontendService;
    }

    [HttpGet]
    [Authorize(Policy = Permissions.Themes.View)]
    public async Task<ActionResult<PagedData<ThemeDto>>> GetAsync(
        [FromQuery] int startIndex,
        [FromQuery] int length,
        [FromQuery] FilterOptions? filterOptions
    )
    {
        // Validation
        if (startIndex < 0)
            return Problem("Invalid start index specified", statusCode: 400);

        if (length is < 1 or > 100)
            return Problem("Invalid length specified");

        // Query building

        var query = ThemeRepository
            .Query();

        // Filters
        if (filterOptions != null)
        {
            foreach (var filterOption in filterOptions.Filters)
            {
                query = filterOption.Key switch
                {
                    nameof(Theme.Name) =>
                        query.Where(user => EF.Functions.ILike(user.Name, $"%{filterOption.Value}%")),

                    nameof(Theme.Version) =>
                        query.Where(user => EF.Functions.ILike(user.Version, $"%{filterOption.Value}%")),

                    nameof(Theme.Author) =>
                        query.Where(user => EF.Functions.ILike(user.Author, $"%{filterOption.Value}%")),

                    _ => query
                };
            }
        }

        // Pagination
        var data = await query
            .OrderBy(x => x.Id)
            .ProjectToDto()
            .Skip(startIndex)
            .Take(length)
            .ToArrayAsync();

        var total = await query.CountAsync();

        return new PagedData<ThemeDto>(data, total);
    }

    [HttpGet("{id:int}")]
    [Authorize(Policy = Permissions.Themes.View)]
    public async Task<ActionResult<ThemeDto>> GetAsync([FromRoute] int id)
    {
        var item = await ThemeRepository
            .Query()
            .FirstOrDefaultAsync(x => x.Id == id);

        if (item == null)
            return Problem("No theme with this id", statusCode: 404);

        return ThemeMapper.ToDto(item);
    }

    [HttpPost]
    [Authorize(Policy = Permissions.Themes.Create)]
    public async Task<ActionResult<ThemeDto>> CreateAsync([FromBody] CreateThemeDto request)
    {
        var theme = ThemeMapper.ToEntity(request);

        var finalTheme = await ThemeRepository.AddAsync(theme);
        await FrontendService.ResetCacheAsync();

        return ThemeMapper.ToDto(finalTheme);
    }

    [HttpPatch("{id:int}")]
    [Authorize(Policy = Permissions.Themes.Edit)]
    public async Task<ActionResult<ThemeDto>> UpdateAsync([FromRoute] int id, [FromBody] UpdateThemeDto request)
    {
        var theme = await ThemeRepository
            .Query()
            .FirstOrDefaultAsync(x => x.Id == id);

        if (theme == null)
            return Problem("No theme with this id found", statusCode: 404);
        
        ThemeMapper.Merge(theme, request);
        await ThemeRepository.UpdateAsync(theme);

        await FrontendService.ResetCacheAsync();

        return ThemeMapper.ToDto(theme);
    }

    [HttpDelete("{id:int}")]
    [Authorize(Policy = Permissions.Themes.Delete)]
    public async Task<ActionResult> DeleteAsync([FromRoute] int id)
    {
        var theme = await ThemeRepository
            .Query()
            .FirstOrDefaultAsync(x => x.Id == id);

        if (theme == null)
            return Problem("No theme with this id found", statusCode: 404);

        await ThemeRepository.RemoveAsync(theme);
        
        await FrontendService.ResetCacheAsync();
        
        return NoContent();
    }
}