package models

import (
	"archive/zip"
	"bytes"
	"fmt"
	"io"
	"net/http"
	"os"
	"path"
	"reflect"
	"sort"
	"strings"

	model_classes "git.andr3h3nriqu3s.com/andr3/fyp/logic/models/classes"
	. "git.andr3h3nriqu3s.com/andr3/fyp/logic/models/utils"
	. "git.andr3h3nriqu3s.com/andr3/fyp/logic/utils"
)

func InsertIfNotPresent(ss []string, s string) []string {
	i := sort.SearchStrings(ss, s)
	if len(ss) > i && ss[i] == s {
		return ss
	}
	ss = append(ss, "")
	copy(ss[i+1:], ss[i:])
	ss[i] = s
	return ss
}

func processZipFile(c *Context, model *BaseModel) {
	reader, err := zip.OpenReader(path.Join("savedData", model.Id, "base_data.zip"))
	if err != nil {
		// TODO add msg to error
		ModelUpdateStatus(c, model.Id, FAILED_PREPARING_ZIP_FILE)
		fmt.Printf("Faield to proccess zip file failed to open reader\n")
		fmt.Println(err)
		return
	}
	defer reader.Close()

	training := []string{}
	testing := []string{}

	for _, file := range reader.Reader.File {

		paths := strings.Split(file.Name, "/")

		if paths[1] == "" {
			continue
		}

		if paths[0] != "training" && paths[0] != "testing" {
			fmt.Printf("Invalid file '%s' TODO add msg to response!!!\n", file.Name)
			ModelUpdateStatus(c, model.Id, FAILED_PREPARING_ZIP_FILE)
			return
		}

		if paths[0] != "training" {
			training = InsertIfNotPresent(training, paths[1])
		} else if paths[0] != "testing" {
			testing = InsertIfNotPresent(testing, paths[1])
		}
	}

	if !reflect.DeepEqual(testing, training) {
		fmt.Printf("testing and training are diferent\n")
		fmt.Println(testing)
		fmt.Println(training)
		ModelUpdateStatus(c, model.Id, FAILED_PREPARING_ZIP_FILE)
		return
	}

	base_path := path.Join("savedData", model.Id, "data")
	if err = os.MkdirAll(base_path, os.ModePerm); err != nil {
		fmt.Printf("Failed to create base_path dir\n")
		ModelUpdateStatus(c, model.Id, FAILED_PREPARING_ZIP_FILE)
		return
	}

	ids := map[string]string{}

	for i, name := range training {
		id, err := model_classes.CreateClass(c.Db, model.Id, i, name)
		if err != nil {
			fmt.Printf("Failed to create class '%s' on db\n", name)
			ModelUpdateStatus(c, id, FAILED_PREPARING_ZIP_FILE)
			return
		}
		ids[name] = id
	}

	for _, file := range reader.Reader.File {
		if file.Name[len(file.Name)-1] == '/' {
			continue
		}

		data, err := reader.Open(file.Name)
		if err != nil {
			fmt.Printf("Could not open file in zip %s\n", file.Name)
			ModelUpdateStatus(c, model.Id, FAILED_PREPARING_ZIP_FILE)
			return
		}
		defer data.Close()
		file_data, err := io.ReadAll(data)
		if err != nil {
			fmt.Printf("Could not read file file in zip %s\n", file.Name)
			ModelUpdateStatus(c, model.Id, FAILED_PREPARING_ZIP_FILE)
			return
		}

		// TODO check if the file is a valid photo that matched the defined photo on the database

		parts := strings.Split(file.Name, "/")

		mode := model_classes.DATA_POINT_MODE_TRAINING
		if parts[0] == "testing" {
			mode = model_classes.DATA_POINT_MODE_TESTING
		}

		data_point_id, err := model_classes.AddDataPoint(c.Db, ids[parts[1]], "id://", mode)
		if err != nil {
			fmt.Printf("Failed to add data point for %s\n", model.Id)
			fmt.Println(err)
			ModelUpdateStatus(c, model.Id, FAILED_PREPARING_ZIP_FILE)
			return
		}

		file_path := path.Join(base_path, data_point_id + "." + model.Format)
		f, err := os.Create(file_path)
		if err != nil {
			fmt.Printf("Could not create file %s\n", file_path)
			ModelUpdateStatus(c, model.Id, FAILED_PREPARING_ZIP_FILE)
			return
		}
		defer f.Close()
		f.Write(file_data)

		if !testImgForModel(c, model, file_path) {
            c.Logger.Errorf("Image did not have valid format for model %s (in zip: %s)!", file_path, file.Name)
            c.Logger.Warn("Not failling updating data point to status -1")
            message := "Image did not have valid format for the model"
            if err = model_classes.UpdateDataPointStatus(c.Db, data_point_id, -1, &message); err != nil {
                c.Logger.Error("Failed to update data point status")
			    ModelUpdateStatus(c, model.Id, FAILED_PREPARING_ZIP_FILE)
            }
		}
	}

	fmt.Printf("Added data to model '%s'!\n", model.Id)
	ModelUpdateStatus(c, model.Id, CONFIRM_PRE_TRAINING)
}

func handleDataUpload(handle *Handle) {
	handle.Post("/models/data/upload", func(w http.ResponseWriter, r *http.Request, c *Context) *Error {
		if !CheckAuthLevel(1, w, r, c) {
			return nil
		}
		if c.Mode == JSON {
			// TODO improve message
			return ErrorCode(nil, 400, nil)
		}

		read_form, err := r.MultipartReader()
		if err != nil {
			LoadBasedOnAnswer(c.Mode, w, "models/add.html", c.AddMap(nil))
			return nil
		}

		var id string
		var file []byte

		for {
			part, err_part := read_form.NextPart()
			if err_part == io.EOF {
				break
			} else if err_part != nil {
				return &Error{Code: http.StatusBadRequest}
			}
			if part.FormName() == "id" {
				buf := new(bytes.Buffer)
				buf.ReadFrom(part)
				id = buf.String()
			}
			if part.FormName() == "file" {
				buf := new(bytes.Buffer)
				buf.ReadFrom(part)
				file = buf.Bytes()
			}
		}

		model, err := GetBaseModel(handle.Db, id)
		if err == ModelNotFoundError {
			return c.ErrorCode(nil, http.StatusNotFound, AnyMap{
				"NotFoundMessage": "Model not found",
				"GoBackLink":      "/models",
			})
		} else if err != nil {
			return Error500(err)
		}

		// TODO mk this path configurable
		dir_path := path.Join("savedData", id)

		f, err := os.Create(path.Join(dir_path, "base_data.zip"))
		if err != nil {
			return Error500(err)
		}
		defer f.Close()

		f.Write(file)

		ModelUpdateStatus(c, id, PREPARING_ZIP_FILE)

		go processZipFile(c, model)

		Redirect("/models/edit?id="+id, c.Mode, w, r)
		return nil
	})

	handle.Delete("/models/data/delete-zip-file", func(w http.ResponseWriter, r *http.Request, c *Context) *Error {
		if !CheckAuthLevel(1, w, r, c) {
			return nil
		}
		if c.Mode == JSON {
			panic("Handle delete zip file json")
		}

		f, err := MyParseForm(r)
		if err != nil {
			return ErrorCode(err, 400, c.AddMap(nil))
		}

		if !CheckId(f, "id") {
			return ErrorCode(err, 400, c.AddMap(nil))
		}

		id := f.Get("id")

		model, err := GetBaseModel(handle.Db, id)
		if err == ModelNotFoundError {
			return ErrorCode(nil, http.StatusNotFound, AnyMap{
				"NotFoundMessage": "Model not found",
				"GoBackLink":      "/models",
			})
		} else if err != nil {
			return Error500(err)
		}

		if model.Status != FAILED_PREPARING_ZIP_FILE {
			// TODO add message
			return ErrorCode(nil, 400, c.AddMap(nil))
		}

		err = os.Remove(path.Join("savedData", id, "base_data.zip"))
		if err != nil {
			return Error500(err)
		}

		err = os.RemoveAll(path.Join("savedData", id, "data"))
		if err != nil {
			return Error500(err)
		}

		_, err = handle.Db.Exec("delete from model_classes where model_id=$1;", id)
		if err != nil {
			return Error500(err)
		}

		ModelUpdateStatus(c, id, CONFIRM_PRE_TRAINING)
		Redirect("/models/edit?id="+id, c.Mode, w, r)
		return nil
	})
}