package models

import (
	"fmt"
	"net/http"
	"os"
	"path"
	"strconv"

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

func deleteModel(handle *Handle, id string, w http.ResponseWriter, c *Context, model BaseModel) {
	fmt.Printf("Removing model with id: %s\n", id)
	_, err := handle.Db.Exec("delete from models where id=$1;", id)
	if err != nil {
		fmt.Println(err)
		panic("TODO handle better deleteModel failed delete database query")
	}

	model_path := path.Join("./savedData", id)
	fmt.Printf("Removing folder of model with id: %s at %s\n", id, model_path)
	err = os.RemoveAll(model_path)
	if err != nil {
		fmt.Println(err)
		panic("TODO handle better deleteModel failed to delete folder")
	}

    if c.Mode == HTML {
        // TODO move this to a constant so i don't forget
        w.WriteHeader(309)
        c.Mode = HTMLFULL
    }

	LoadBasedOnAnswer(c.Mode, w, "/models/delete.html", c.AddMap(AnyMap{
		"Model": model,
	}))
}

func handleDelete(handle *Handle) {
	handle.Delete("/models/delete", func(w http.ResponseWriter, r *http.Request, c *Context) *Error {
		if c.Mode == JSON {
			panic("TODO handle json on models/delete")
		}

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

		if !CheckId(f, "id") {
			return ErrorCode(nil, http.StatusNotFound, AnyMap{
				"NotFoundMessage": "Model not found",
				"GoBackLink":      "/models",
			})
		}

		id := f.Get("id")

		// TODO handle admin users
		rows, err := handle.Db.Query("select name, status from models where id=$1 and user_id=$2;", id, c.User.Id)
		if err != nil {
			return Error500(err)
		}
        defer rows.Close()

		if !rows.Next() {
			return ErrorCode(nil, http.StatusNotFound, AnyMap{
				"NotFoundMessage": "Model not found",
				"GoBackLink":      "/models",
			})
		}

        model := BaseModel{}
		model.Id = id

		err = rows.Scan(&model.Name, &model.Status)
		if err != nil {
			return Error500(err)
		}

		switch model.Status {
		case FAILED_PREPARING_TRAINING:
            fallthrough
		case FAILED_PREPARING:
			deleteModel(handle, id, w, c, model)
			return nil
        case READY:
            fallthrough
		case CONFIRM_PRE_TRAINING:

			if CheckEmpty(f, "name") {
				// TODO improve result
				return ErrorCode(nil, http.StatusBadRequest, nil)
			}

			name := f.Get("name")
			if name != model.Name {
				LoadDefineTemplate(w, "/models/edit.html", "delete-model-card", c.AddMap(AnyMap{
					"NameDoesNotMatch": true,
					"Model":            model,
				}))
				return nil
			}

			deleteModel(handle, id, w, c, model)
			return nil
		default:
			panic("Do not know how to handle model in status:" + strconv.Itoa(model.Status))
		}
	})
}