// SPDX-FileCopyrightText: Copyright The Miniflux Authors. All rights reserved.
// SPDX-License-Identifier: Apache-2.0

package form // import "miniflux.app/v2/internal/ui/form"

import (
	"net/http"
	"strconv"

	"miniflux.app/v2/internal/config"
	"miniflux.app/v2/internal/locale"
	"miniflux.app/v2/internal/model"
	"miniflux.app/v2/internal/validator"
)

// MarkReadBehavior list all possible behaviors for automatically marking an entry as read
type MarkReadBehavior string

const (
	NoAutoMarkAsRead                           MarkReadBehavior = "no-auto"
	MarkAsReadOnView                           MarkReadBehavior = "on-view"
	MarkAsReadOnViewButWaitForPlayerCompletion MarkReadBehavior = "on-view-but-wait-for-player-completion"
	MarkAsReadOnlyOnPlayerCompletion           MarkReadBehavior = "on-player-completion"
)

// 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
	CustomJS               string
	ExternalFontHosts      string
	EntrySwipe             bool
	GestureNav             string
	DisplayMode            string
	DefaultReadingSpeed    int
	CJKReadingSpeed        int
	DefaultHomePage        string
	CategoriesSortingOrder string
	MarkReadOnView         bool
	// MarkReadBehavior is a string representation of the MarkReadOnView and MarkReadOnMediaPlayerCompletion fields together
	MarkReadBehavior      MarkReadBehavior
	MediaPlaybackRate     float64
	BlockFilterEntryRules string
	KeepFilterEntryRules  string
}

// MarkAsReadBehavior returns the MarkReadBehavior from the given MarkReadOnView and MarkReadOnMediaPlayerCompletion values.
// Useful to convert the values from the User model to the form
func MarkAsReadBehavior(markReadOnView, markReadOnMediaPlayerCompletion bool) MarkReadBehavior {
	switch {
	case markReadOnView && !markReadOnMediaPlayerCompletion:
		return MarkAsReadOnView
	case markReadOnView && markReadOnMediaPlayerCompletion:
		return MarkAsReadOnViewButWaitForPlayerCompletion
	case !markReadOnView && markReadOnMediaPlayerCompletion:
		return MarkAsReadOnlyOnPlayerCompletion
	case !markReadOnView && !markReadOnMediaPlayerCompletion:
		fallthrough // Explicit defaulting
	default:
		return NoAutoMarkAsRead
	}
}

// ExtractMarkAsReadBehavior returns the MarkReadOnView and MarkReadOnMediaPlayerCompletion values from the given MarkReadBehavior.
// Useful to extract the values from the form to the User model
func ExtractMarkAsReadBehavior(behavior MarkReadBehavior) (markReadOnView, markReadOnMediaPlayerCompletion bool) {
	switch behavior {
	case MarkAsReadOnView:
		return true, false
	case MarkAsReadOnViewButWaitForPlayerCompletion:
		return true, true
	case MarkAsReadOnlyOnPlayerCompletion:
		return false, true
	case NoAutoMarkAsRead:
		fallthrough // Explicit defaulting
	default:
		return false, false
	}
}

// Merge updates the fields of the given user.
func (s *SettingsForm) Merge(user *model.User) *model.User {
	if !config.Opts.DisableLocalAuth() {
		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.CustomJS = s.CustomJS
	user.ExternalFontHosts = s.ExternalFontHosts
	user.EntrySwipe = s.EntrySwipe
	user.GestureNav = s.GestureNav
	user.DisplayMode = s.DisplayMode
	user.CJKReadingSpeed = s.CJKReadingSpeed
	user.DefaultReadingSpeed = s.DefaultReadingSpeed
	user.DefaultHomePage = s.DefaultHomePage
	user.CategoriesSortingOrder = s.CategoriesSortingOrder
	user.MediaPlaybackRate = s.MediaPlaybackRate
	user.BlockFilterEntryRules = s.BlockFilterEntryRules
	user.KeepFilterEntryRules = s.KeepFilterEntryRules

	MarkReadOnView, MarkReadOnMediaPlayerCompletion := ExtractMarkAsReadBehavior(s.MarkReadBehavior)
	user.MarkReadOnView = MarkReadOnView
	user.MarkReadOnMediaPlayerCompletion = MarkReadOnMediaPlayerCompletion

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

	return user
}

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

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

	if s.MediaPlaybackRate < 0.25 || s.MediaPlaybackRate > 4 {
		return locale.NewLocalizedError("error.settings_media_playback_rate_range")
	}

	if s.ExternalFontHosts != "" {
		if !validator.IsValidDomainList(s.ExternalFontHosts) {
			return locale.NewLocalizedError("error.settings_invalid_domain_list")
		}
	}

	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
	}
	mediaPlaybackRate, err := strconv.ParseFloat(r.FormValue("media_playback_rate"), 64)
	if err != nil {
		mediaPlaybackRate = 1
	}
	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"),
		CustomJS:               r.FormValue("custom_js"),
		ExternalFontHosts:      r.FormValue("external_font_hosts"),
		EntrySwipe:             r.FormValue("entry_swipe") == "1",
		GestureNav:             r.FormValue("gesture_nav"),
		DisplayMode:            r.FormValue("display_mode"),
		DefaultReadingSpeed:    int(defaultReadingSpeed),
		CJKReadingSpeed:        int(cjkReadingSpeed),
		DefaultHomePage:        r.FormValue("default_home_page"),
		CategoriesSortingOrder: r.FormValue("categories_sorting_order"),
		MarkReadOnView:         r.FormValue("mark_read_on_view") == "1",
		MarkReadBehavior:       MarkReadBehavior(r.FormValue("mark_read_behavior")),
		MediaPlaybackRate:      mediaPlaybackRate,
		BlockFilterEntryRules:  r.FormValue("block_filter_entry_rules"),
		KeepFilterEntryRules:   r.FormValue("keep_filter_entry_rules"),
	}
}