package api

import (
	"log"

	"lishwist/http/api/db"
	"lishwist/http/templates"

	"golang.org/x/crypto/bcrypt"
)

type RegisterProps struct {
	GeneralError    string `json:",omitempty"`
	Username        templates.InputProps
	Password        templates.InputProps
	ConfirmPassword templates.InputProps
}

func (p *RegisterProps) Validate() (valid bool) {
	valid = true

	if p.Password.Value != p.ConfirmPassword.Value {
		p.ConfirmPassword.Error = "Passwords didn't match"
		valid = false
	}

	if !p.Username.Validate() {
		valid = false
	}

	if !p.Password.Validate() {
		valid = false
	}

	if !p.ConfirmPassword.Validate() {
		valid = false
	}

	return
}

func NewRegisterProps(usernameVal, passwordVal, confirmPassVal string) *RegisterProps {
	return &RegisterProps{
		GeneralError: "",
		Username: templates.InputProps{
			Name:      "username",
			Required:  true,
			MinLength: 4,
			Value:     usernameVal,
		},
		Password: templates.InputProps{
			Type:      "password",
			Name:      "newPassword",
			Required:  true,
			MinLength: 5,
			Value:     passwordVal,
		},
		ConfirmPassword: templates.InputProps{
			Type:     "password",
			Name:     "confirmPassword",
			Required: true,
			Value:    confirmPassVal,
		},
	}
}

func Register(username, newPassword, confirmPassword string) *RegisterProps {
	props := NewRegisterProps(username, newPassword, confirmPassword)

	valid := props.Validate()
	props.Password.Value = ""
	props.ConfirmPassword.Value = ""
	if !valid {
		log.Printf("Invalid props: %#v\n", props)
		return props
	}

	existingUser, _ := db.GetUserByName(username)
	if existingUser != nil {
		log.Printf("Username is taken: %q\n", existingUser.NormalName)
		props.Username.Error = "Username is taken"
		return props
	}

	hashedPasswordBytes, err := bcrypt.GenerateFromPassword([]byte(newPassword), bcrypt.MinCost)
	if err != nil {
		log.Printf("Failed to hash password: %s\n", err)
		props.GeneralError = "Something went wrong. Error code: Aang"
		return props
	}

	_, err = db.CreateUser(username, hashedPasswordBytes)
	if err != nil {
		log.Printf("Failed to create user: %s\n", err)
		props.GeneralError = "Something went wrong. Error code: Ozai"
		return props
	}

	return nil
}