// Copyright 2017 Frédéric Guillot. All rights reserved.
// Use of this source code is governed by the Apache 2.0
// license that can be found in the LICENSE file.

package form // import "miniflux.app/ui/form"

import (
	"net/http"
	"strconv"

	"miniflux.app/errors"
	"miniflux.app/model"
)

// SettingsForm represents the settings form.
type SettingsForm struct {
	Username            string
	Password            string
	Confirmation        string
	Theme               string
	Language            string
	Timezone            string
	EntryDirection      string
	EntryOrder          string
	EntriesPerPage      int
	KeyboardShortcuts   bool
	ShowReadingTime     bool
	CustomCSS           string
	EntrySwipe          bool
	DisplayMode         string
	DefaultReadingSpeed int
	CJKReadingSpeed     int
	DefaultHomePage     string
}

// Merge updates the fields of the given user.
func (s *SettingsForm) Merge(user *model.User) *model.User {
	user.Username = s.Username
	user.Theme = s.Theme
	user.Language = s.Language
	user.Timezone = s.Timezone
	user.EntryDirection = s.EntryDirection
	user.EntryOrder = s.EntryOrder
	user.EntriesPerPage = s.EntriesPerPage
	user.KeyboardShortcuts = s.KeyboardShortcuts
	user.ShowReadingTime = s.ShowReadingTime
	user.Stylesheet = s.CustomCSS
	user.EntrySwipe = s.EntrySwipe
	user.DisplayMode = s.DisplayMode
	user.CJKReadingSpeed = s.CJKReadingSpeed
	user.DefaultReadingSpeed = s.DefaultReadingSpeed
	user.DefaultHomePage = s.DefaultHomePage

	if s.Password != "" {
		user.Password = s.Password
	}

	return user
}

// Validate makes sure the form values are valid.
func (s *SettingsForm) Validate() error {
	if s.Username == "" || s.Theme == "" || s.Language == "" || s.Timezone == "" || s.EntryDirection == "" || s.DisplayMode == "" || s.DefaultHomePage == "" {
		return errors.NewLocalizedError("error.settings_mandatory_fields")
	}

	if s.CJKReadingSpeed <= 0 || s.DefaultReadingSpeed <= 0 {
		return errors.NewLocalizedError("error.settings_reading_speed_is_positive")
	}

	if s.Confirmation == "" {
		// Firefox insists on auto-completing the password field.
		// If the confirmation field is blank, the user probably
		// didn't intend to change their password.
		s.Password = ""
	} else if s.Password != "" {
		if s.Password != s.Confirmation {
			return errors.NewLocalizedError("error.different_passwords")
		}
	}

	return nil
}

// NewSettingsForm returns a new SettingsForm.
func NewSettingsForm(r *http.Request) *SettingsForm {
	entriesPerPage, err := strconv.ParseInt(r.FormValue("entries_per_page"), 10, 0)
	if err != nil {
		entriesPerPage = 0
	}
	defaultReadingSpeed, err := strconv.ParseInt(r.FormValue("default_reading_speed"), 10, 0)
	if err != nil {
		defaultReadingSpeed = 0
	}
	cjkReadingSpeed, err := strconv.ParseInt(r.FormValue("cjk_reading_speed"), 10, 0)
	if err != nil {
		cjkReadingSpeed = 0
	}
	return &SettingsForm{
		Username:            r.FormValue("username"),
		Password:            r.FormValue("password"),
		Confirmation:        r.FormValue("confirmation"),
		Theme:               r.FormValue("theme"),
		Language:            r.FormValue("language"),
		Timezone:            r.FormValue("timezone"),
		EntryDirection:      r.FormValue("entry_direction"),
		EntryOrder:          r.FormValue("entry_order"),
		EntriesPerPage:      int(entriesPerPage),
		KeyboardShortcuts:   r.FormValue("keyboard_shortcuts") == "1",
		ShowReadingTime:     r.FormValue("show_reading_time") == "1",
		CustomCSS:           r.FormValue("custom_css"),
		EntrySwipe:          r.FormValue("entry_swipe") == "1",
		DisplayMode:         r.FormValue("display_mode"),
		DefaultReadingSpeed: int(defaultReadingSpeed),
		CJKReadingSpeed:     int(cjkReadingSpeed),
		DefaultHomePage:     r.FormValue("default_home_page"),
	}
}