package main

import (
	"bytes"
	"context"
	"crypto/tls"
	"encoding/json"
	"flag"
	"fmt"
	"log"
	"net/http"
	"net/url"
	"os"
	"strconv"
	"strings"
	"time"

	"github.com/alecthomas/chroma/v2/quick"
	"github.com/google/generative-ai-go/genai"
	"github.com/lrstanley/girc"
	"github.com/pelletier/go-toml/v2"
	openai "github.com/sashabaranov/go-openai"
	"google.golang.org/api/option"
)

const (
	milli = 1000
)

type TomlConfig struct {
	IrcServer           string
	IrcNick             string
	IrcSaslUser         string
	IrcSaslPass         string
	OllamaEndpoint      string
	Model               string
	ChromaStyle         string
	ChromaFormatter     string
	Provider            string
	Apikey              string
	OllamaSystem        string
	Temp                float64
	RequestTimeout      int
	MillaReconnectDelay int
	IrcPort             int
	KeepAlive           int
	MemoryLImit         int
	TopP                float32
	TopK                int32
	Color               bool
	EnableSasl          bool
	SkipTLSVerify       bool
	Admins              []string
	IrcChannels         []string
}

type OllamaRequestOptions struct {
	Temperature float64 `json:"temperature"`
}

type OllamaChatResponse struct {
	Role    string `json:"role"`
	Content string `json:"content"`
}

type OllamaChatMessagesResponse struct {
	Messages OllamaChatResponse `json:"message"`
}

type OllamaChatRequest struct {
	Model      string               `json:"model"`
	Stream     bool                 `json:"stream"`
	Keep_alive time.Duration        `json:"keep_alive"`
	Options    OllamaRequestOptions `json:"options"`
	Messages   []MemoryElement      `json:"messages"`
}

type MemoryElement struct {
	Role    string `json:"role"`
	Content string `json:"content"`
}

func returnGeminiResponse(resp *genai.GenerateContentResponse) string {
	result := ""

	for _, cand := range resp.Candidates {
		if cand.Content != nil {
			for _, part := range cand.Content.Parts {
				result += fmt.Sprintln(part)
			}
		}
	}

	return result
}

func runIRC(appConfig TomlConfig, ircChan chan *girc.Client) {
	var Memory []MemoryElement

	irc := girc.New(girc.Config{
		Server: appConfig.IrcServer,
		Port:   appConfig.IrcPort,
		Nick:   appConfig.IrcNick,
		User:   appConfig.IrcNick,
		Name:   appConfig.IrcNick,
		SSL:    true,
		TLSConfig: &tls.Config{
			InsecureSkipVerify: appConfig.SkipTLSVerify,
			ServerName:         appConfig.IrcServer,
		},
	})

	saslUser := appConfig.IrcSaslUser
	saslPass := appConfig.IrcSaslPass

	if appConfig.EnableSasl && saslUser != "" && saslPass != "" {
		irc.Config.SASL = &girc.SASLPlain{
			User: appConfig.IrcSaslUser,
			Pass: appConfig.IrcSaslPass,
		}
	}

	irc.Handlers.AddBg(girc.CONNECTED, func(c *girc.Client, e girc.Event) {
		for _, channel := range appConfig.IrcChannels {
			c.Cmd.Join(channel)
		}
	})

	switch appConfig.Provider {
	case "ollama":
		irc.Handlers.AddBg(girc.PRIVMSG, func(client *girc.Client, event girc.Event) {
			if strings.HasPrefix(event.Last(), appConfig.IrcNick+": ") {
				prompt := strings.TrimPrefix(event.Last(), appConfig.IrcNick+": ")
				log.Println(prompt)

				var jsonPayload []byte
				var err error

				memoryElement := MemoryElement{
					Role:    "user",
					Content: prompt,
				}

				if len(Memory) > appConfig.MemoryLImit {
					Memory = Memory[:0]
				}
				Memory = append(Memory, memoryElement)

				ollamaRequest := OllamaChatRequest{
					Model:      appConfig.Model,
					Keep_alive: time.Duration(appConfig.KeepAlive),
					Stream:     false,
					Messages:   Memory,
					Options: OllamaRequestOptions{
						Temperature: appConfig.Temp,
					},
				}
				jsonPayload, err = json.Marshal(ollamaRequest)
				log.Printf(string(jsonPayload))
				if err != nil {
					client.Cmd.ReplyTo(event, fmt.Sprintf("error: %s", err.Error()))

					return
				}

				ctx, cancel := context.WithTimeout(context.Background(), time.Duration(appConfig.RequestTimeout)*time.Second)
				defer cancel()

				request, err := http.NewRequest(http.MethodPost, appConfig.OllamaEndpoint, bytes.NewBuffer(jsonPayload))
				request = request.WithContext(ctx)
				if err != nil {
					client.Cmd.ReplyTo(event, fmt.Sprintf("error: %s", err.Error()))

					return
				}

				request.Header.Set("Content-Type", "application/json")

				httpClient := http.Client{}
				allProxy := os.Getenv("ALL_PROXY")
				if allProxy != "" {
					proxyUrl, err := url.Parse(allProxy)
					if err != nil {
						client.Cmd.ReplyTo(event, fmt.Sprintf("error: %s", err.Error()))

						return
					}
					transport := &http.Transport{
						Proxy: http.ProxyURL(proxyUrl),
					}

					httpClient.Transport = transport
				}

				response, err := httpClient.Do(request)
				if err != nil {
					client.Cmd.ReplyTo(event, fmt.Sprintf("error: %s", err.Error()))

					return
				}
				defer response.Body.Close()

				var writer bytes.Buffer

				var ollamaChatResponse OllamaChatMessagesResponse
				err = json.NewDecoder(response.Body).Decode(&ollamaChatResponse)
				if err != nil {
					client.Cmd.ReplyTo(event, fmt.Sprintf("error: %s", err.Error()))
				}

				assistantElement := MemoryElement{
					Role:    "assistant",
					Content: ollamaChatResponse.Messages.Content,
				}

				Memory = append(Memory, assistantElement)

				log.Println(ollamaChatResponse)
				err = quick.Highlight(&writer,
					ollamaChatResponse.Messages.Content,
					"markdown",
					appConfig.ChromaFormatter,
					appConfig.ChromaStyle)
				if err != nil {
					client.Cmd.ReplyTo(event, fmt.Sprintf("error: %s", err.Error()))

					return
				}

				log.Println(writer.String())
				client.Cmd.Reply(event, writer.String())
			}
		})
	case "gemini":
		irc.Handlers.AddBg(girc.PRIVMSG, func(client *girc.Client, event girc.Event) {
			if strings.HasPrefix(event.Last(), appConfig.IrcNick+": ") {
				prompt := strings.TrimPrefix(event.Last(), appConfig.IrcNick+": ")
				log.Println(prompt)

				ctx, cancel := context.WithTimeout(context.Background(), time.Duration(appConfig.RequestTimeout)*time.Second)
				defer cancel()

				// api and http client dont work together
				// https://github.com/google/generative-ai-go/issues/80
				// httpClient := http.Client{}
				// allProxy := os.Getenv("ALL_PROXY")
				// if allProxy != "" {
				// 	proxyUrl, err := url.Parse(allProxy)
				// 	if err != nil {
				// 		client.Cmd.ReplyTo(event, fmt.Sprintf("error: %s", err.Error()))

				// 		return
				// 	}
				// 	transport := &http.Transport{
				// 		Proxy: http.ProxyURL(proxyUrl),
				// 	}

				// 	httpClient.Transport = transport
				// }

				// clientGemini, err := genai.NewClient(ctx, option.WithAPIKey(appConfig.Apikey), option.WithHTTPClient(&httpClient))
				clientGemini, err := genai.NewClient(ctx, option.WithAPIKey(appConfig.Apikey))
				if err != nil {
					client.Cmd.ReplyTo(event, fmt.Sprintf("error: %s", err.Error()))

					return
				}
				defer clientGemini.Close()

				model := clientGemini.GenerativeModel(appConfig.Model)
				model.SetTemperature(float32(appConfig.Temp))
				model.SetTopK(appConfig.TopK)
				model.SetTopP(appConfig.TopP)

				cs := model.StartChat()

				resp, err := cs.SendMessage(ctx, genai.Text(prompt))
				if err != nil {
					client.Cmd.ReplyTo(event, fmt.Sprintf("error: %s", err.Error()))

					return
				}

				// resp, err := model.GenerateContent(ctx, genai.Text(prompt))
				// if err != nil {
				// 	client.Cmd.ReplyTo(event, fmt.Sprintf("error: %s", err.Error()))

				// 	return
				// }

				geminiResponse := returnGeminiResponse(resp)
				log.Println(geminiResponse)

				cs.History = append(cs.History, &genai.Content{
					Parts: []genai.Part{
						genai.Text(prompt),
					},
					Role: "user",
				})

				cs.History = append(cs.History, &genai.Content{
					Parts: []genai.Part{
						genai.Text(geminiResponse),
					},
					Role: "model",
				})

				var writer bytes.Buffer
				err = quick.Highlight(
					&writer,
					geminiResponse,
					"markdown",
					appConfig.ChromaFormatter,
					appConfig.ChromaStyle)
				if err != nil {
					client.Cmd.ReplyTo(event, fmt.Sprintf("error: %s", err.Error()))

					return
				}

				log.Println(writer.String())
				client.Cmd.Reply(event, writer.String())
			}
		})
	case "chatgpt":
		irc.Handlers.AddBg(girc.PRIVMSG, func(client *girc.Client, event girc.Event) {
			if strings.HasPrefix(event.Last(), appConfig.IrcNick+": ") {
				prompt := strings.TrimPrefix(event.Last(), appConfig.IrcNick+": ")
				log.Println(prompt)

				ctx, cancel := context.WithTimeout(context.Background(), time.Duration(appConfig.RequestTimeout)*time.Second)
				defer cancel()

				allProxy := os.Getenv("ALL_PROXY")
				config := openai.DefaultConfig(appConfig.Apikey)
				if allProxy != "" {
					proxyURL, err := url.Parse(allProxy)
					if err != nil {
						client.Cmd.ReplyTo(event, fmt.Sprintf("error: %s", err.Error()))

						return
					}
					transport := &http.Transport{
						Proxy: http.ProxyURL(proxyURL),
					}

					config.HTTPClient = &http.Client{
						Transport: transport,
					}
				}

				gptClient := openai.NewClientWithConfig(config)

				messages := make([]openai.ChatCompletionMessage, 0)

				messages = append(messages, openai.ChatCompletionMessage{
					Role:    "system",
					Content: prompt,
				})

				resp, err := gptClient.CreateChatCompletion(ctx, openai.ChatCompletionRequest{
					Model:    appConfig.Model,
					Messages: messages,
				})
				if err != nil {
					client.Cmd.ReplyTo(event, fmt.Sprintf("error: %s", err.Error()))

					return
				}

				var writer bytes.Buffer
				err = quick.Highlight(
					&writer,
					resp.Choices[0].Message.Content,
					"markdown",
					appConfig.ChromaFormatter,
					appConfig.ChromaStyle)
				if err != nil {
					client.Cmd.ReplyTo(event, fmt.Sprintf("error: %s", err.Error()))

					return
				}

				log.Println(writer.String())
				lines := strings.Split(writer.String(), "\n")

				for _, line := range lines {
					client.Cmd.Reply(event, line)
				}
			}
		})
	}

	ircChan <- irc

	for {
		if err := irc.Connect(); err != nil {
			log.Println(err)
			log.Println("reconnecting in" + strconv.Itoa(appConfig.MillaReconnectDelay/milli))
			time.Sleep(time.Duration(appConfig.MillaReconnectDelay) * time.Second)
		} else {
			return
		}
	}
}

func main() {
	var appConfig TomlConfig

	configPath := flag.String("config", "./config.toml", "path to the config file")

	flag.Parse()

	data, err := os.ReadFile(*configPath)
	if err != nil {
		log.Fatal(err)
	}

	err = toml.Unmarshal(data, &appConfig)
	if err != nil {
		log.Fatal(err)
	}

	log.Println(appConfig)

	ircChan := make(chan *girc.Client, 1)

	runIRC(appConfig, ircChan)
}