package main

import (
	"bytes"
	"context"
	"encoding/base64"
	"encoding/json"
	"fmt"
	"io"
	"log"
	"net/http"
	"os"
	"path/filepath"
	"screenmark/screenmark/.gen/haystack/haystack/model"
	"screenmark/screenmark/models"
	"time"

	"github.com/go-chi/chi/v5"
	"github.com/go-chi/chi/v5/middleware"
	"github.com/google/uuid"
	"github.com/joho/godotenv"
	"github.com/lib/pq"
)

type TestAiClient struct {
	ImageInfo ImageInfo
}

func (client TestAiClient) GetImageInfo(imageName string, imageData []byte) (ImageInfo, error) {
	return client.ImageInfo, nil
}

func GetAiClient() (AiClient, error) {
	mode := os.Getenv("MODE")
	if mode == "TESTING" {
		return TestAiClient{
			ImageInfo: ImageInfo{
				Tags:  []string{"tag"},
				Links: []string{"links"},
				Text:  []string{"text"},
			},
		}, nil
	}

	return CreateOpenAiClient()
}

func main() {
	err := godotenv.Load()
	if err != nil {
		panic(err)
	}

	mode := os.Getenv("MODE")
	log.Printf("Mode: %s\n", mode)

	db, err := models.InitDatabase()
	if err != nil {
		panic(err)
	}

	imageModel := models.NewImageModel(db)
	linkModel := models.NewLinkModel(db)
	tagModel := models.NewTagModel(db)
	textModel := models.NewTextModel(db)

	listener := pq.NewListener(os.Getenv("DB_CONNECTION"), time.Second, time.Second, func(event pq.ListenerEventType, err error) {
		if err != nil {
			panic(err)
		}
	})
	defer listener.Close()

	go func() {
		err := listener.Listen("new_image")
		if err != nil {
			panic(err)
		}

		for {

			select {
			case parameters := <-listener.Notify:
				imageId := uuid.MustParse(parameters.Extra)

				ctx := context.Background()

				go func() {
					openAiClient, err := GetAiClient()
					if err != nil {
						panic(err)
					}

					image, err := imageModel.GetToProcessWithData(ctx, imageId)
					if err != nil {
						return
					}

					imageInfo, err := openAiClient.GetImageInfo(image.Image.ImageName, image.Image.Image)
					if err != nil {
						return
					}

					savedImage, err := imageModel.FinishProcessing(ctx, image.ID)
					if err != nil {
						return
					}

					err = tagModel.SaveToImage(ctx, savedImage.ID, imageInfo.Tags)
					if err != nil {
						return
					}

					err = linkModel.Save(ctx, savedImage.ID, imageInfo.Links)
					if err != nil {
						return
					}

					err = textModel.Save(ctx, savedImage.ID, imageInfo.Text)
					if err != nil {
						return
					}
				}()
			}
		}
	}()

	r := chi.NewRouter()

	r.Use(middleware.Logger)
	r.Use(func(next http.Handler) http.Handler {
		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			w.Header().Add("Content-Type", "application/json")

			next.ServeHTTP(w, r)
		})
	})

	r.Options("/*", func(w http.ResponseWriter, r *http.Request) {
		w.Header().Add("Access-Control-Allow-Origin", "*")
		w.Header().Add("Access-Control-Allow-Credentials", "*")
		w.Header().Add("Access-Control-Allow-Headers", "*")
	})

	r.Get("/image", func(w http.ResponseWriter, r *http.Request) {
		userId := r.Header.Get("userId")

		w.Header().Add("Access-Control-Allow-Origin", "*")
		w.Header().Add("Access-Control-Allow-Credentials", "*")
		w.Header().Add("Access-Control-Allow-Headers", "*")

		images, err := imageModel.ListWithProperties(r.Context(), uuid.MustParse(userId))
		if err != nil {
			log.Println(err)
			w.WriteHeader(http.StatusNotFound)
			fmt.Fprintf(w, "Something went wrong")
			return
		}

		jsonImages, err := json.Marshal(images)
		if err != nil {
			log.Println(err)
			w.WriteHeader(http.StatusBadRequest)
			fmt.Fprintf(w, "Could not create JSON response for this image")
			return
		}

		w.Write(jsonImages)
	})

	r.Get("/image/{id}", func(w http.ResponseWriter, r *http.Request) {
		imageId := r.PathValue("id")

		w.Header().Add("Access-Control-Allow-Origin", "*")
		w.Header().Add("Access-Control-Allow-Credentials", "*")
		w.Header().Add("Access-Control-Allow-Headers", "*")

		// TODO: really need authorization here!
		image, err := imageModel.Get(r.Context(), uuid.MustParse(imageId))
		if err != nil {
			log.Println(err)
			w.WriteHeader(http.StatusNotFound)
			fmt.Fprintf(w, "Could not get image")
			return
		}

		// TODO: this could be part of the db table
		extension := filepath.Ext(image.Image.ImageName)
		extension = extension[1:]

		w.Header().Add("Content-Type", "image/"+extension)
		w.Write(image.Image.Image)
	})

	r.Post("/image/{name}", func(w http.ResponseWriter, r *http.Request) {
		imageName := r.PathValue("name")

		userId := r.Header.Get("userId")

		w.Header().Add("Access-Control-Allow-Origin", "*")
		w.Header().Add("Access-Control-Allow-Credentials", "*")
		w.Header().Add("Access-Control-Allow-Headers", "*")

		if len(imageName) == 0 {
			w.WriteHeader(http.StatusBadRequest)
			fmt.Fprintf(w, "You need to provide a name in the path")
			return
		}

		contentType := r.Header.Get("Content-Type")

		log.Println(contentType)

		// TODO: length checks on body
		// TODO: extract this shit out
		image := make([]byte, 0)
		if contentType == "application/base64" {
			decoder := base64.NewDecoder(base64.StdEncoding, r.Body)
			buf := &bytes.Buffer{}

			decodedIamge, err := io.Copy(buf, decoder)
			if err != nil {
				log.Println(err)
				w.WriteHeader(http.StatusBadRequest)
				fmt.Fprintf(w, "bruh, base64 aint decoding")
				return
			}

			fmt.Println(string(image))
			fmt.Println(decodedIamge)

			image = buf.Bytes()
		} else if contentType == "application/oclet-stream" {
			bodyData, err := io.ReadAll(r.Body)
			if err != nil {
				log.Println(err)
				w.WriteHeader(http.StatusBadRequest)
				fmt.Fprintf(w, "bruh, binary aint binaring")
				return
			}
			// TODO: check headers

			image = bodyData
		} else {
			log.Println("bad stuff?")
			w.WriteHeader(http.StatusBadRequest)
			fmt.Fprintf(w, "Bruh, you need oclet stream or base64")
			return
		}

		if err != nil {
			log.Println("First case")
			w.WriteHeader(http.StatusBadRequest)
			fmt.Fprintf(w, "Couldnt read the image from the request body")
			return
		}

		userImage, err := imageModel.Process(r.Context(), uuid.MustParse(userId), model.Image{
			Image:     image,
			ImageName: imageName,
		})
		if err != nil {
			log.Println("Second case")
			log.Println(err)
			w.WriteHeader(http.StatusBadRequest)
			fmt.Fprintf(w, "Could not save image to DB")
			return
		}

		jsonUserImage, err := json.Marshal(userImage)
		if err != nil {
			log.Println("Third case")
			log.Println(err)
			w.WriteHeader(http.StatusBadRequest)
			fmt.Fprintf(w, "Could not create JSON response for this image")
			return
		}

		w.WriteHeader(http.StatusCreated)

		fmt.Fprint(w, string(jsonUserImage))
		w.Header().Add("Content-Type", "application/json")
	})

	log.Println("Listening and serving on port 3040.")

	http.ListenAndServe(":3040", r)
}