// Copyright 2014 The Gogs Authors. All rights reserved.
// Copyright 2018 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.

package forms

import (
	"mime/multipart"
	"net/http"
	"strings"

	"code.gitea.io/gitea/modules/context"
	"code.gitea.io/gitea/modules/setting"
	"code.gitea.io/gitea/modules/web/middleware"

	"gitea.com/go-chi/binding"
)

// InstallForm form for installation page
type InstallForm struct {
	DbType   string `binding:"Required"`
	DbHost   string
	DbUser   string
	DbPasswd string
	DbName   string
	SSLMode  string
	Charset  string `binding:"Required;In(utf8,utf8mb4)"`
	DbPath   string
	DbSchema string

	AppName      string `binding:"Required" locale:"install.app_name"`
	RepoRootPath string `binding:"Required"`
	LFSRootPath  string
	RunUser      string `binding:"Required"`
	Domain       string `binding:"Required"`
	SSHPort      int
	HTTPPort     string `binding:"Required"`
	AppURL       string `binding:"Required"`
	LogRootPath  string `binding:"Required"`

	SMTPHost        string
	SMTPFrom        string
	SMTPUser        string `binding:"OmitEmpty;MaxSize(254)" locale:"install.mailer_user"`
	SMTPPasswd      string
	RegisterConfirm bool
	MailNotify      bool

	OfflineMode                    bool
	DisableGravatar                bool
	EnableFederatedAvatar          bool
	EnableOpenIDSignIn             bool
	EnableOpenIDSignUp             bool
	DisableRegistration            bool
	AllowOnlyExternalRegistration  bool
	EnableCaptcha                  bool
	RequireSignInView              bool
	DefaultKeepEmailPrivate        bool
	DefaultAllowCreateOrganization bool
	DefaultEnableTimetracking      bool
	NoReplyAddress                 string

	PasswordAlgorithm string

	AdminName          string `binding:"OmitEmpty;AlphaDashDot;MaxSize(30)" locale:"install.admin_name"`
	AdminPasswd        string `binding:"OmitEmpty;MaxSize(255)" locale:"install.admin_password"`
	AdminConfirmPasswd string
	AdminEmail         string `binding:"OmitEmpty;MinSize(3);MaxSize(254);Include(@)" locale:"install.admin_email"`
}

// Validate validates the fields
func (f *InstallForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
	ctx := context.GetContext(req)
	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
}

//    _____   ____ _________________ ___
//   /  _  \ |    |   \__    ___/   |   \
//  /  /_\  \|    |   / |    | /    ~    \
// /    |    \    |  /  |    | \    Y    /
// \____|__  /______/   |____|  \___|_  /
//         \/                         \/

// RegisterForm form for registering
type RegisterForm struct {
	UserName           string `binding:"Required;AlphaDashDot;MaxSize(40)"`
	Email              string `binding:"Required;Email;MaxSize(254)"`
	Password           string `binding:"MaxSize(255)"`
	Retype             string
	GRecaptchaResponse string `form:"g-recaptcha-response"`
	HcaptchaResponse   string `form:"h-captcha-response"`
}

// Validate validates the fields
func (f *RegisterForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
	ctx := context.GetContext(req)
	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
}

// IsEmailDomainListed checks whether the domain of an email address
// matches a list of domains
func IsEmailDomainListed(list []string, email string) bool {
	if len(list) == 0 {
		return false
	}

	n := strings.LastIndex(email, "@")
	if n <= 0 {
		return false
	}

	domain := strings.ToLower(email[n+1:])

	for _, v := range list {
		if strings.ToLower(v) == domain {
			return true
		}
	}

	return false
}

// IsEmailDomainAllowed validates that the email address
// provided by the user matches what has been configured .
// The email is marked as allowed if it matches any of the
// domains in the whitelist or if it doesn't match any of
// domains in the blocklist, if any such list is not empty.
func (f RegisterForm) IsEmailDomainAllowed() bool {
	if len(setting.Service.EmailDomainWhitelist) == 0 {
		return !IsEmailDomainListed(setting.Service.EmailDomainBlocklist, f.Email)
	}

	return IsEmailDomainListed(setting.Service.EmailDomainWhitelist, f.Email)
}

// MustChangePasswordForm form for updating your password after account creation
// by an admin
type MustChangePasswordForm struct {
	Password string `binding:"Required;MaxSize(255)"`
	Retype   string
}

// Validate validates the fields
func (f *MustChangePasswordForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
	ctx := context.GetContext(req)
	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
}

// SignInForm form for signing in with user/password
type SignInForm struct {
	UserName string `binding:"Required;MaxSize(254)"`
	// TODO remove required from password for SecondFactorAuthentication
	Password string `binding:"Required;MaxSize(255)"`
	Remember bool
}

// Validate validates the fields
func (f *SignInForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
	ctx := context.GetContext(req)
	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
}

// AuthorizationForm form for authorizing oauth2 clients
type AuthorizationForm struct {
	ResponseType string `binding:"Required;In(code)"`
	ClientID     string `binding:"Required"`
	RedirectURI  string
	State        string
	Scope        string
	Nonce        string

	// PKCE support
	CodeChallengeMethod string // S256, plain
	CodeChallenge       string
}

// Validate validates the fields
func (f *AuthorizationForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
	ctx := context.GetContext(req)
	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
}

// GrantApplicationForm form for authorizing oauth2 clients
type GrantApplicationForm struct {
	ClientID    string `binding:"Required"`
	RedirectURI string
	State       string
	Scope       string
	Nonce       string
}

// Validate validates the fields
func (f *GrantApplicationForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
	ctx := context.GetContext(req)
	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
}

// AccessTokenForm for issuing access tokens from authorization codes or refresh tokens
type AccessTokenForm struct {
	GrantType    string `json:"grant_type"`
	ClientID     string `json:"client_id"`
	ClientSecret string `json:"client_secret"`
	RedirectURI  string `json:"redirect_uri"`
	Code         string `json:"code"`
	RefreshToken string `json:"refresh_token"`

	// PKCE support
	CodeVerifier string `json:"code_verifier"`
}

// Validate validates the fields
func (f *AccessTokenForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
	ctx := context.GetContext(req)
	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
}

//   __________________________________________.___ _______    ________  _________
//  /   _____/\_   _____/\__    ___/\__    ___/|   |\      \  /  _____/ /   _____/
//  \_____  \  |    __)_   |    |     |    |   |   |/   |   \/   \  ___ \_____  \
//  /        \ |        \  |    |     |    |   |   /    |    \    \_\  \/        \
// /_______  //_______  /  |____|     |____|   |___\____|__  /\______  /_______  /
//         \/         \/                                   \/        \/        \/

// UpdateProfileForm form for updating profile
type UpdateProfileForm struct {
	Name                string `binding:"AlphaDashDot;MaxSize(40)"`
	FullName            string `binding:"MaxSize(100)"`
	KeepEmailPrivate    bool
	Website             string `binding:"ValidUrl;MaxSize(255)"`
	Location            string `binding:"MaxSize(50)"`
	Language            string
	Description         string `binding:"MaxSize(255)"`
	KeepActivityPrivate bool
}

// Validate validates the fields
func (f *UpdateProfileForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
	ctx := context.GetContext(req)
	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
}

// Avatar types
const (
	AvatarLocal  string = "local"
	AvatarByMail string = "bymail"
)

// AvatarForm form for changing avatar
type AvatarForm struct {
	Source      string
	Avatar      *multipart.FileHeader
	Gravatar    string `binding:"OmitEmpty;Email;MaxSize(254)"`
	Federavatar bool
}

// Validate validates the fields
func (f *AvatarForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
	ctx := context.GetContext(req)
	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
}

// AddEmailForm form for adding new email
type AddEmailForm struct {
	Email string `binding:"Required;Email;MaxSize(254)"`
}

// Validate validates the fields
func (f *AddEmailForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
	ctx := context.GetContext(req)
	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
}

// UpdateThemeForm form for updating a users' theme
type UpdateThemeForm struct {
	Theme string `binding:"Required;MaxSize(30)"`
}

// Validate validates the field
func (f *UpdateThemeForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
	ctx := context.GetContext(req)
	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
}

// IsThemeExists checks if the theme is a theme available in the config.
func (f UpdateThemeForm) IsThemeExists() bool {
	var exists bool

	for _, v := range setting.UI.Themes {
		if strings.EqualFold(v, f.Theme) {
			exists = true
			break
		}
	}

	return exists
}

// ChangePasswordForm form for changing password
type ChangePasswordForm struct {
	OldPassword string `form:"old_password" binding:"MaxSize(255)"`
	Password    string `form:"password" binding:"Required;MaxSize(255)"`
	Retype      string `form:"retype"`
}

// Validate validates the fields
func (f *ChangePasswordForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
	ctx := context.GetContext(req)
	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
}

// AddOpenIDForm is for changing openid uri
type AddOpenIDForm struct {
	Openid string `binding:"Required;MaxSize(256)"`
}

// Validate validates the fields
func (f *AddOpenIDForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
	ctx := context.GetContext(req)
	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
}

// AddKeyForm form for adding SSH/GPG key
type AddKeyForm struct {
	Type       string `binding:"OmitEmpty"`
	Title      string `binding:"Required;MaxSize(50)"`
	Content    string `binding:"Required"`
	IsWritable bool
}

// Validate validates the fields
func (f *AddKeyForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
	ctx := context.GetContext(req)
	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
}

// NewAccessTokenForm form for creating access token
type NewAccessTokenForm struct {
	Name string `binding:"Required;MaxSize(255)"`
}

// Validate validates the fields
func (f *NewAccessTokenForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
	ctx := context.GetContext(req)
	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
}

// EditOAuth2ApplicationForm form for editing oauth2 applications
type EditOAuth2ApplicationForm struct {
	Name        string `binding:"Required;MaxSize(255)" form:"application_name"`
	RedirectURI string `binding:"Required" form:"redirect_uri"`
}

// Validate validates the fields
func (f *EditOAuth2ApplicationForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
	ctx := context.GetContext(req)
	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
}

// TwoFactorAuthForm for logging in with 2FA token.
type TwoFactorAuthForm struct {
	Passcode string `binding:"Required"`
}

// Validate validates the fields
func (f *TwoFactorAuthForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
	ctx := context.GetContext(req)
	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
}

// TwoFactorScratchAuthForm for logging in with 2FA scratch token.
type TwoFactorScratchAuthForm struct {
	Token string `binding:"Required"`
}

// Validate validates the fields
func (f *TwoFactorScratchAuthForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
	ctx := context.GetContext(req)
	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
}

// U2FRegistrationForm for reserving an U2F name
type U2FRegistrationForm struct {
	Name string `binding:"Required"`
}

// Validate validates the fields
func (f *U2FRegistrationForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
	ctx := context.GetContext(req)
	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
}

// U2FDeleteForm for deleting U2F keys
type U2FDeleteForm struct {
	ID int64 `binding:"Required"`
}

// Validate validates the fields
func (f *U2FDeleteForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
	ctx := context.GetContext(req)
	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
}