using Microsoft.EntityFrameworkCore;
using ROLAC.API.Data;
using ROLAC.API.DTOs.Disbursement;
using ROLAC.API.Entities;

namespace ROLAC.API.Services;

public class ChurchProfileService : IChurchProfileService
{
    private readonly AppDbContext _db;
    public ChurchProfileService(AppDbContext db) => _db = db;

    public async Task<ChurchProfileDto> GetAsync()
    {
        var p = await GetOrCreateAsync();
        return new ChurchProfileDto
        {
            Id = p.Id, Name = p.Name, NameZh = p.NameZh, Phone = p.Phone, Email = p.Email,
            Website = p.Website, Address = p.Address, City = p.City, State = p.State,
            ZipCode = p.ZipCode, BankName = p.BankName, BankAccountNumber = p.BankAccountNumber,
            BankRoutingNumber = p.BankRoutingNumber, PayerEin = p.PayerEin, NextCheckNumber = p.NextCheckNumber,
            AiProvider = p.AiProvider,
            ClaudeModel = p.ClaudeModel,
            ClaudeApiKeyMasked = Mask(p.ClaudeApiKey),
            GeminiModel = p.GeminiModel,
            GeminiApiKeyMasked = Mask(p.GeminiApiKey),
        };
    }

    public async Task UpdateAsync(UpdateChurchProfileRequest r)
    {
        var p = await GetOrCreateAsync();
        p.Name = r.Name; p.NameZh = r.NameZh; p.Phone = r.Phone; p.Email = r.Email;
        p.Website = r.Website; p.Address = r.Address; p.City = r.City; p.State = r.State;
        p.ZipCode = r.ZipCode; p.BankName = r.BankName; p.BankAccountNumber = r.BankAccountNumber;
        p.BankRoutingNumber = r.BankRoutingNumber; p.PayerEin = r.PayerEin; p.NextCheckNumber = r.NextCheckNumber;
        p.AiProvider  = string.IsNullOrWhiteSpace(r.AiProvider) ? "Claude" : r.AiProvider;
        p.ClaudeModel = r.ClaudeModel;
        p.GeminiModel = r.GeminiModel;
        // Leave-unchanged semantics: only overwrite a stored key when a new value is supplied.
        if (!string.IsNullOrWhiteSpace(r.ClaudeApiKey)) p.ClaudeApiKey = r.ClaudeApiKey;
        if (!string.IsNullOrWhiteSpace(r.GeminiApiKey)) p.GeminiApiKey = r.GeminiApiKey;
        await _db.SaveChangesAsync();
    }

    private async Task<ChurchProfile> GetOrCreateAsync()
    {
        var p = await _db.ChurchProfiles.OrderBy(x => x.Id).FirstOrDefaultAsync();
        if (p is null)
        {
            p = new ChurchProfile { Name = "Church", NextCheckNumber = 1001 };
            _db.ChurchProfiles.Add(p);
            await _db.SaveChangesAsync();
        }
        return p;
    }

    /// <summary>Mask a stored secret for display: 6 bullets + last 4 chars; fully masked when ≤4 chars.</summary>
    private static string Mask(string? key)
    {
        if (string.IsNullOrEmpty(key)) return "";
        if (key.Length <= 4) return new string('•', key.Length);
        return new string('•', 6) + key[^4..];
    }
}