using System.Text;
using System.Text.Json;
using NimbusFlow.Frontend.Models;

namespace NimbusFlow.Frontend.Services
{
    public class ApiService : IApiService
    {
        private readonly HttpClient _httpClient;
        private readonly JsonSerializerOptions _jsonOptions;

        public ApiService(HttpClient httpClient)
        {
            _httpClient = httpClient;
            _jsonOptions = new JsonSerializerOptions
            {
                PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
                PropertyNameCaseInsensitive = true
            };
        }

        // Member operations
        public async Task<List<Member>> GetMembersAsync()
        {
            var response = await _httpClient.GetAsync("members");
            response.EnsureSuccessStatusCode();
            var json = await response.Content.ReadAsStringAsync();
            return JsonSerializer.Deserialize<List<Member>>(json, _jsonOptions) ?? new List<Member>();
        }

        public async Task<Member?> GetMemberAsync(int id)
        {
            var response = await _httpClient.GetAsync($"members/{id}");
            if (response.StatusCode == System.Net.HttpStatusCode.NotFound)
                return null;
            response.EnsureSuccessStatusCode();
            var json = await response.Content.ReadAsStringAsync();
            return JsonSerializer.Deserialize<Member>(json, _jsonOptions);
        }

        public async Task<Member> CreateMemberAsync(Member member)
        {
            var json = JsonSerializer.Serialize(member, _jsonOptions);
            var content = new StringContent(json, Encoding.UTF8, "application/json");
            var response = await _httpClient.PostAsync("members", content);
            response.EnsureSuccessStatusCode();
            var responseJson = await response.Content.ReadAsStringAsync();
            return JsonSerializer.Deserialize<Member>(responseJson, _jsonOptions) ?? member;
        }

        public async Task<Member> UpdateMemberAsync(Member member)
        {
            var json = JsonSerializer.Serialize(member, _jsonOptions);
            var content = new StringContent(json, Encoding.UTF8, "application/json");
            var response = await _httpClient.PutAsync($"members/{member.MemberId}", content);
            response.EnsureSuccessStatusCode();
            var responseJson = await response.Content.ReadAsStringAsync();
            return JsonSerializer.Deserialize<Member>(responseJson, _jsonOptions) ?? member;
        }

        public async Task<bool> DeleteMemberAsync(int id)
        {
            var response = await _httpClient.DeleteAsync($"members/{id}");
            return response.IsSuccessStatusCode;
        }

        // Classification operations
        public async Task<List<Classification>> GetClassificationsAsync()
        {
            var response = await _httpClient.GetAsync("classifications");
            response.EnsureSuccessStatusCode();
            var json = await response.Content.ReadAsStringAsync();
            return JsonSerializer.Deserialize<List<Classification>>(json, _jsonOptions) ?? new List<Classification>();
        }

        // Service operations
        public async Task<List<Service>> GetServicesAsync()
        {
            var response = await _httpClient.GetAsync("services");
            response.EnsureSuccessStatusCode();
            var json = await response.Content.ReadAsStringAsync();
            return JsonSerializer.Deserialize<List<Service>>(json, _jsonOptions) ?? new List<Service>();
        }

        public async Task<Service?> GetServiceAsync(int id)
        {
            var response = await _httpClient.GetAsync($"services/{id}");
            if (response.StatusCode == System.Net.HttpStatusCode.NotFound)
                return null;
            response.EnsureSuccessStatusCode();
            var json = await response.Content.ReadAsStringAsync();
            return JsonSerializer.Deserialize<Service>(json, _jsonOptions);
        }

        public async Task<Service> CreateServiceAsync(Service service)
        {
            var json = JsonSerializer.Serialize(service, _jsonOptions);
            var content = new StringContent(json, Encoding.UTF8, "application/json");
            var response = await _httpClient.PostAsync("services", content);
            response.EnsureSuccessStatusCode();
            var responseJson = await response.Content.ReadAsStringAsync();
            return JsonSerializer.Deserialize<Service>(responseJson, _jsonOptions) ?? service;
        }

        // Schedule operations
        public async Task<List<Schedule>> GetSchedulesAsync()
        {
            var response = await _httpClient.GetAsync("schedules");
            response.EnsureSuccessStatusCode();
            var json = await response.Content.ReadAsStringAsync();
            return JsonSerializer.Deserialize<List<Schedule>>(json, _jsonOptions) ?? new List<Schedule>();
        }

        public async Task<List<Schedule>> GetMemberSchedulesAsync(int memberId)
        {
            var response = await _httpClient.GetAsync($"members/{memberId}/schedules");
            response.EnsureSuccessStatusCode();
            var json = await response.Content.ReadAsStringAsync();
            return JsonSerializer.Deserialize<List<Schedule>>(json, _jsonOptions) ?? new List<Schedule>();
        }

        public async Task<Schedule?> GetScheduleAsync(int id)
        {
            var response = await _httpClient.GetAsync($"schedules/{id}");
            if (response.StatusCode == System.Net.HttpStatusCode.NotFound)
                return null;
            response.EnsureSuccessStatusCode();
            var json = await response.Content.ReadAsStringAsync();
            return JsonSerializer.Deserialize<Schedule>(json, _jsonOptions);
        }

        public async Task<Schedule> AcceptScheduleAsync(int scheduleId)
        {
            var response = await _httpClient.PostAsync($"schedules/{scheduleId}/accept", null);
            response.EnsureSuccessStatusCode();
            var responseJson = await response.Content.ReadAsStringAsync();
            return JsonSerializer.Deserialize<Schedule>(responseJson, _jsonOptions) ?? new Schedule();
        }

        public async Task<Schedule> DeclineScheduleAsync(int scheduleId, string? reason = null)
        {
            var content = new StringContent(
                JsonSerializer.Serialize(new { reason }, _jsonOptions),
                Encoding.UTF8,
                "application/json"
            );
            var response = await _httpClient.PostAsync($"schedules/{scheduleId}/decline", content);
            response.EnsureSuccessStatusCode();
            var responseJson = await response.Content.ReadAsStringAsync();
            return JsonSerializer.Deserialize<Schedule>(responseJson, _jsonOptions) ?? new Schedule();
        }

        public async Task<bool> RemoveScheduleAsync(int scheduleId)
        {
            var response = await _httpClient.DeleteAsync($"schedules/{scheduleId}");
            return response.IsSuccessStatusCode;
        }

        public async Task<Schedule?> ScheduleNextMemberAsync(int serviceId, List<int> classificationIds)
        {
            var content = new StringContent(
                JsonSerializer.Serialize(new { serviceId, classificationIds }, _jsonOptions),
                Encoding.UTF8,
                "application/json"
            );
            var response = await _httpClient.PostAsync("schedules/schedule-next", content);
            if (response.StatusCode == System.Net.HttpStatusCode.NotFound)
                return null;
            response.EnsureSuccessStatusCode();
            var responseJson = await response.Content.ReadAsStringAsync();
            return JsonSerializer.Deserialize<Schedule>(responseJson, _jsonOptions);
        }

        public async Task<List<ServiceType>> GetServiceTypesAsync()
        {
            var response = await _httpClient.GetAsync("service-types");
            response.EnsureSuccessStatusCode();
            var json = await response.Content.ReadAsStringAsync();
            return JsonSerializer.Deserialize<List<ServiceType>>(json, _jsonOptions) ?? new List<ServiceType>();
        }
    }
}