using System;
using System.Collections.Generic;
using System.Net.Http;
using System.Text;
using System.Text.Json;
using System.Threading.Tasks;

namespace AI.Client
{
    public class AiClient
    {
        private readonly HttpClient _httpClient;
        private readonly string _baseUrl;

        public AiClient(string baseUrl = "http://localhost:8080/api")
        {
            _baseUrl = baseUrl.TrimEnd('/');
            _httpClient = new HttpClient();
            _httpClient.Timeout = TimeSpan.FromMinutes(15); // Increased to 15 minutes for long generations
        }

        // --- CORE COMMANDS ---

        public async Task<Dictionary<string, InstanceState>> GetInstancesAsync()
        {
            return await GetJsonAsync<Dictionary<string, InstanceState>>("/admin/instances");
        }

        public async Task<AiResponse> SendPromptAsync(string text, string instanceId = null)
        {
            var payload = new { prompt = text, blocking = true, instance_id = instanceId };
            return await PostJsonAsync<AiResponse>("/admin/inject", payload);
        }

        public async Task<AiResponse> NewChatAsync(string instanceId = null)
        {
            var payload = new { blocking = true, instance_id = instanceId };
            return await PostJsonAsync<AiResponse>("/admin/action/new_chat", payload);
        }

        public async Task<AiResponse> ToggleUrlContextAsync(bool enabled, string instanceId = null)
        {
            var payload = new { enabled = enabled, blocking = true, instance_id = instanceId };
            return await PostJsonAsync<AiResponse>("/admin/action/toggle_url_context", payload);
        }

        public async Task<AiResponse> SetResolutionAsync(string level, string instanceId = null)
        {
            var payload = new { level = level, blocking = true, instance_id = instanceId };
            return await PostJsonAsync<AiResponse>("/admin/action/resolution", payload);
        }

        public async Task<AiResponse> DeleteTurnAsync(int index, string instanceId = null)
        {
            var payload = new { index = index, blocking = true, instance_id = instanceId };
            return await PostJsonAsync<AiResponse>("/admin/action/delete", payload);
        }

        // --- ADVANCED COMMANDS ---

        public async Task<AiResponse> SetSettingsAsync(string instanceId, float? temp, float? topP, string model, string sysInst, string thinkingLevel)
        {
            // Use a dictionary to avoid sending null values which might confuse the backend
            var payload = new Dictionary<string, object>();
            if (!string.IsNullOrEmpty(instanceId)) payload["instance_id"] = instanceId;
            if (temp.HasValue) payload["temperature"] = temp.Value;
            if (topP.HasValue) payload["top_p"] = topP.Value;
            if (!string.IsNullOrEmpty(model)) payload["model"] = model;
            if (!string.IsNullOrEmpty(sysInst)) payload["system_instructions"] = sysInst;
            if (!string.IsNullOrEmpty(thinkingLevel)) payload["thinking_level"] = thinkingLevel;

            payload["blocking"] = true;

            return await PostJsonAsync<AiResponse>("/admin/action/settings", payload);
        }

        public async Task<AiResponse> GetSettingsAsync(string instanceId = null)
        {
            var payload = new { blocking = true, instance_id = instanceId };
            return await PostJsonAsync<AiResponse>("/admin/action/get_settings", payload);
        }

        public async Task<AiResponse> GetChatHistoryAsync(string instanceId = null, bool forceSync = false)
        {
            var payload = new { blocking = true, instance_id = instanceId, force_sync = forceSync };
            return await PostJsonAsync<AiResponse>("/admin/action/get_chat_history", payload);
        }

        public async Task<AiResponse> CreateShardAsync(string instanceId = null)
        {
            var payload = new { blocking = true, instance_id = instanceId };
            return await PostJsonAsync<AiResponse>("/admin/action/create_shard", payload);
        }

        public async Task<AiResponse> InjectShardAsync(string shardData, string instanceId = null)
        {
            var payload = new { shard_data = shardData, blocking = true, instance_id = instanceId };
            return await PostJsonAsync<AiResponse>("/admin/action/inject_shard", payload);
        }

        public async Task<AiResponse> InjectDocAsync(string filename, string content, string instanceId = null)
        {
            var payload = new { filename = filename, content = content, blocking = true, instance_id = instanceId };
            return await PostJsonAsync<AiResponse>("/admin/action/inject_doc", payload);
        }

        public async Task<AiResponse> SetOpenAISystemInstructionsAsync(string instructions)
        {
            var payload = new { instructions = instructions };
            return await PostJsonAsync<AiResponse>("/admin/openai/system_instructions", payload);
        }

        // --- INTERNAL HELPERS ---

        private async Task<T> GetJsonAsync<T>(string endpoint)
        {
            try
            {
                var response = await _httpClient.GetAsync(_baseUrl + endpoint);
                response.EnsureSuccessStatusCode();
                var responseString = await response.Content.ReadAsStringAsync();
                var options = new JsonSerializerOptions { PropertyNameCaseInsensitive = true };
                return JsonSerializer.Deserialize<T>(responseString, options);
            }
            catch (Exception ex)
            {
                throw new Exception($"API GET Failed: {ex.Message}", ex);
            }
        }

        private async Task<T> PostJsonAsync<T>(string endpoint, object data)
        {
            try
            {
                var json = JsonSerializer.Serialize(data);
                var content = new StringContent(json, Encoding.UTF8, "application/json");

                var response = await _httpClient.PostAsync(_baseUrl + endpoint, content);
                response.EnsureSuccessStatusCode();

                var responseString = await response.Content.ReadAsStringAsync();

                var options = new JsonSerializerOptions { PropertyNameCaseInsensitive = true };
                return JsonSerializer.Deserialize<T>(responseString, options);
            }
            catch (Exception ex)
            {
                throw new Exception($"API POST Failed: {ex.Message}", ex);
            }
        }
    }

    // --- DATA MODELS ---

    public class AiResponse
    {
        public string Status { get; set; }
        public string Task_Id { get; set; }
        public string Instance_Id { get; set; }
        public string Mode { get; set; }
        public string Output { get; set; }
        public string Error { get; set; }
    }

    public class InstanceState
    {
        public string last_seen { get; set; }
        public string url { get; set; }
        public int turn_count { get; set; }
        public bool is_busy { get; set; }
    }

    public class AiSettings
    {
        public float? Temperature { get; set; }
        public float? Top_P { get; set; }
        public string Model { get; set; }
        public string Thinking_Level { get; set; }
        public string System_Instructions { get; set; }
        public string Resolution { get; set; }
        public bool? Url_Context { get; set; }
    }

    public class AiChatTurn
    {
        public string Role { get; set; }
        public string Text { get; set; }
    }
}