using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Caching.Memory;
using Microsoft.Extensions.Options;
using Moonlight.Api.Configuration;
using Moonlight.Api.Database;
using Moonlight.Api.Database.Entities;

namespace Moonlight.Api.Services;

public class SettingsService
{
    private readonly DatabaseRepository<SettingsOption> Repository;
    private readonly IOptions<SettingsOptions> Options;
    private readonly IMemoryCache Cache;

    private const string CacheKey = "Moonlight.Api.SettingsService.{0}";

    public SettingsService(
        DatabaseRepository<SettingsOption> repository,
        IOptions<SettingsOptions> options,
        IMemoryCache cache
    )
    {
        Repository = repository;
        Cache = cache;
        Options = options;
    }

    public async Task<string?> GetValueAsync(string key)
    {
        var cacheKey = string.Format(CacheKey, key);

        if (!Cache.TryGetValue<string>(cacheKey, out var value))
        {
            var retrievedValue = await Repository
                .Query()
                .Where(x => x.Key == key)
                .Select(o => o.Value)
                .FirstOrDefaultAsync();

            Cache.Set(
                cacheKey,
                retrievedValue,
                TimeSpan.FromMinutes(Options.Value.CacheMinutes)
            );

            return retrievedValue;
        }

        return value;
    }

    public async Task SetValueAsync(string key, string value)
    {
        var cacheKey = string.Format(CacheKey, key);
        
        var option = await Repository
            .Query()
            .FirstOrDefaultAsync(x => x.Key == key);

        if (option != null)
        {
            option.Value = value;
            await Repository.UpdateAsync(option);
        }
        else
        {
            option = new SettingsOption()
            {
                Key = key,
                Value = value
            };
            
            await Repository.AddAsync(option);
        }
        
        Cache.Remove(cacheKey);
    }
}