using FinlyticFundamentals.Database;
using FinlyticFundamentals.Entities;
using Microsoft.EntityFrameworkCore;

namespace FinlyticFundamentals.Services;

public interface ISettingsDbService
{
    /// <summary>
    /// Gets the settings.
    /// </summary>
    Task<FundamentalsSettingsEntity> GetSettingsAsync();
    /// <summary>
    /// Saves the settings.
    /// </summary>
    Task<FundamentalsSettingsEntity> SaveSettingsAsync(FundamentalsSettingsEntity settings);
    /// <summary>
    /// Updates the settings from a dictionary.
    /// </summary>
    Task UpdateSettingsFromDictionaryAsync(Dictionary<string, string> dictionary);
}

public class SettingsDbService : ISettingsDbService
{
    private readonly FundamentalsDbContext _context;

    public SettingsDbService(FundamentalsDbContext context)
    {
        _context = context;
    }

    /// <summary>
    /// Gets the settings asynchronously.
    /// </summary>
    public async Task<FundamentalsSettingsEntity> GetSettingsAsync()
    {
        var settings = await _context.Settings.AsNoTracking().FirstOrDefaultAsync();
        if (settings == null)
        {
            settings = new FundamentalsSettingsEntity { Id = Guid.NewGuid() };
            _context.Settings.Add(settings);
            await _context.SaveChangesAsync();
            _context.ChangeTracker.Clear();
        }
        return settings;
    }

    /// <summary>
    /// Saves the settings asynchronously.
    /// </summary>
    public async Task<FundamentalsSettingsEntity> SaveSettingsAsync(FundamentalsSettingsEntity settings)
    {
        var existing = await _context.Settings.FirstOrDefaultAsync();
        if (existing == null)
        {
            if (settings.Id == Guid.Empty) settings.Id = Guid.NewGuid();
            _context.Settings.Add(settings);
        }
        else
        {
            existing.CacheTtlHours = settings.CacheTtlHours;
            existing.EnableYahooFallback = settings.EnableYahooFallback;
            existing.UpdatedAt = settings.UpdatedAt;
            _context.Settings.Update(existing);
        }
        await _context.SaveChangesAsync();
        return settings;
    }

    /// <summary>
    /// Updates the settings from a dictionary asynchronously.
    /// </summary>
    public async Task UpdateSettingsFromDictionaryAsync(Dictionary<string, string> dictionary)
    {
        var settings = await GetSettingsAsync();

        foreach (var (key, value) in dictionary)
        {
            if (string.Equals(key, "CacheTtlHours", StringComparison.OrdinalIgnoreCase) && int.TryParse(value, out var ttl))
                settings.CacheTtlHours = ttl;
            else if (string.Equals(key, "EnableYahooFallback", StringComparison.OrdinalIgnoreCase) && bool.TryParse(value, out var fallback))
                settings.EnableYahooFallback = fallback;
        }

        settings.UpdatedAt = DateTime.UtcNow;
        await SaveSettingsAsync(settings);
    }
}