namespace TaxBaik.Web.Services.AdminClients;

using System.Text.Json;
using TaxBaik.Domain.Entities;

public interface IContractBrowserClient
{
    Task<List<Contract>> GetAllAsync(CancellationToken ct = default);
    Task<Contract?> GetByIdAsync(int id, CancellationToken ct = default);
    Task<List<Contract>> GetByClientIdAsync(int clientId, CancellationToken ct = default);
    Task<List<Contract>> GetActiveContractsAsync(CancellationToken ct = default);
    Task<List<Contract>> GetExpiringContractsAsync(int daysAhead = 30, CancellationToken ct = default);
    Task<decimal> GetMonthlyRecurringRevenueAsync(CancellationToken ct = default);
    Task<int> CreateAsync(int clientId, string contractNumber, string serviceType, DateTime startDate,
        decimal? monthlyFee = null, decimal? totalAmount = null, CancellationToken ct = default);
    Task DeleteAsync(int id, CancellationToken ct = default);
}

public class ContractBrowserClient(HttpClient httpClient, ITokenStore tokenStore, ILogger<ContractBrowserClient> logger)
    : IContractBrowserClient
{
    private const string BaseUrl = "/api/contract";

    private void EnsureAuthHeader()
    {
        if (!string.IsNullOrEmpty(tokenStore.AccessToken))
            httpClient.DefaultRequestHeaders.Authorization = new("Bearer", tokenStore.AccessToken);
        else
            httpClient.DefaultRequestHeaders.Authorization = null;
    }

    public async Task<List<Contract>> GetAllAsync(CancellationToken ct = default)
    {
        try
        {
            EnsureAuthHeader();
            return await httpClient.GetFromJsonAsync<List<Contract>>($"{BaseUrl}", ct) ?? [];
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "Failed to get contracts");
            return [];
        }
    }

    public async Task<Contract?> GetByIdAsync(int id, CancellationToken ct = default)
    {
        try
        {
            EnsureAuthHeader();
            return await httpClient.GetFromJsonAsync<Contract>($"{BaseUrl}/{id}", ct);
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "Failed to get contract {Id}", id);
            return null;
        }
    }

    public async Task<List<Contract>> GetByClientIdAsync(int clientId, CancellationToken ct = default)
    {
        try
        {
            EnsureAuthHeader();
            return await httpClient.GetFromJsonAsync<List<Contract>>($"{BaseUrl}/client/{clientId}", ct) ?? [];
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "Failed to get contracts for client {ClientId}", clientId);
            return [];
        }
    }

    public async Task<List<Contract>> GetActiveContractsAsync(CancellationToken ct = default)
    {
        try
        {
            EnsureAuthHeader();
            var response = await httpClient.GetFromJsonAsync<JsonElement>($"{BaseUrl}/active", ct);
            if (response.TryGetProperty("data", out var data))
                return System.Text.Json.JsonSerializer.Deserialize<List<Contract>>(data.GetRawText()) ?? [];
            return [];
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "Failed to get active contracts");
            return [];
        }
    }

    public async Task<List<Contract>> GetExpiringContractsAsync(int daysAhead = 30, CancellationToken ct = default)
    {
        try
        {
            EnsureAuthHeader();
            var response = await httpClient.GetFromJsonAsync<JsonElement>($"{BaseUrl}/expiring?daysAhead={daysAhead}", ct);
            if (response.TryGetProperty("data", out var data))
                return System.Text.Json.JsonSerializer.Deserialize<List<Contract>>(data.GetRawText()) ?? [];
            return [];
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "Failed to get expiring contracts");
            return [];
        }
    }

    public async Task<decimal> GetMonthlyRecurringRevenueAsync(CancellationToken ct = default)
    {
        try
        {
            EnsureAuthHeader();
            var response = await httpClient.GetFromJsonAsync<JsonElement>($"{BaseUrl}/mrr", ct);
            if (response.TryGetProperty("mrr", out var mrrValue))
                return System.Text.Json.JsonSerializer.Deserialize<decimal>(mrrValue.GetRawText());
            return 0;
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "Failed to get MRR");
            return 0;
        }
    }

    public async Task<int> CreateAsync(int clientId, string contractNumber, string serviceType, DateTime startDate,
        decimal? monthlyFee = null, decimal? totalAmount = null, CancellationToken ct = default)
    {
        try
        {
            EnsureAuthHeader();
            var request = new { clientId, contractNumber, serviceType, startDate, monthlyFee, totalAmount };
            var response = await httpClient.PostAsJsonAsync(BaseUrl, request, ct);
            response.EnsureSuccessStatusCode();
            var result = await response.Content.ReadFromJsonAsync<JsonElement>(cancellationToken: ct);
            return result.TryGetProperty("id", out var idProp) ? idProp.GetInt32() : 0;
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "Failed to create contract");
            return 0;
        }
    }

    public async Task DeleteAsync(int id, CancellationToken ct = default)
    {
        try
        {
            EnsureAuthHeader();
            var response = await httpClient.DeleteAsync($"{BaseUrl}/{id}", ct);
            response.EnsureSuccessStatusCode();
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "Failed to delete contract {Id}", id);
        }
    }
}
