// Copyright 2014 The Gogs Authors. All rights reserved.
// Copyright 2020 The Gitea Authors.
// SPDX-License-Identifier: MIT

package admin

import (
	"net/http"
	"net/url"
	"strconv"
	"strings"

	"code.gitea.io/gitea/models"
	"code.gitea.io/gitea/models/auth"
	"code.gitea.io/gitea/models/db"
	user_model "code.gitea.io/gitea/models/user"
	"code.gitea.io/gitea/modules/auth/password"
	"code.gitea.io/gitea/modules/base"
	"code.gitea.io/gitea/modules/context"
	"code.gitea.io/gitea/modules/log"
	"code.gitea.io/gitea/modules/setting"
	"code.gitea.io/gitea/modules/util"
	"code.gitea.io/gitea/modules/web"
	"code.gitea.io/gitea/routers/web/explore"
	user_setting "code.gitea.io/gitea/routers/web/user/setting"
	"code.gitea.io/gitea/services/forms"
	"code.gitea.io/gitea/services/mailer"
	user_service "code.gitea.io/gitea/services/user"
)

const (
	tplUsers    base.TplName = "admin/user/list"
	tplUserNew  base.TplName = "admin/user/new"
	tplUserEdit base.TplName = "admin/user/edit"
)

// Users show all the users
func Users(ctx *context.Context) {
	ctx.Data["Title"] = ctx.Tr("admin.users")
	ctx.Data["PageIsAdmin"] = true
	ctx.Data["PageIsAdminUsers"] = true

	extraParamStrings := map[string]string{}
	statusFilterKeys := []string{"is_active", "is_admin", "is_restricted", "is_2fa_enabled", "is_prohibit_login"}
	statusFilterMap := map[string]string{}
	for _, filterKey := range statusFilterKeys {
		paramKey := "status_filter[" + filterKey + "]"
		paramVal := ctx.FormString(paramKey)
		statusFilterMap[filterKey] = paramVal
		if paramVal != "" {
			extraParamStrings[paramKey] = paramVal
		}
	}

	sortType := ctx.FormString("sort")
	if sortType == "" {
		sortType = explore.UserSearchDefaultSortType
	}
	ctx.PageData["adminUserListSearchForm"] = map[string]interface{}{
		"StatusFilterMap": statusFilterMap,
		"SortType":        sortType,
	}

	explore.RenderUserSearch(ctx, &user_model.SearchUserOptions{
		Actor: ctx.Doer,
		Type:  user_model.UserTypeIndividual,
		ListOptions: db.ListOptions{
			PageSize: setting.UI.Admin.UserPagingNum,
		},
		SearchByEmail:      true,
		IsActive:           util.OptionalBoolParse(statusFilterMap["is_active"]),
		IsAdmin:            util.OptionalBoolParse(statusFilterMap["is_admin"]),
		IsRestricted:       util.OptionalBoolParse(statusFilterMap["is_restricted"]),
		IsTwoFactorEnabled: util.OptionalBoolParse(statusFilterMap["is_2fa_enabled"]),
		IsProhibitLogin:    util.OptionalBoolParse(statusFilterMap["is_prohibit_login"]),
		ExtraParamStrings:  extraParamStrings,
	}, tplUsers)
}

// NewUser render adding a new user page
func NewUser(ctx *context.Context) {
	ctx.Data["Title"] = ctx.Tr("admin.users.new_account")
	ctx.Data["PageIsAdmin"] = true
	ctx.Data["PageIsAdminUsers"] = true
	ctx.Data["DefaultUserVisibilityMode"] = setting.Service.DefaultUserVisibilityMode
	ctx.Data["AllowedUserVisibilityModes"] = setting.Service.AllowedUserVisibilityModesSlice.ToVisibleTypeSlice()

	ctx.Data["login_type"] = "0-0"

	sources, err := auth.Sources()
	if err != nil {
		ctx.ServerError("auth.Sources", err)
		return
	}
	ctx.Data["Sources"] = sources

	ctx.Data["CanSendEmail"] = setting.MailService != nil
	ctx.HTML(http.StatusOK, tplUserNew)
}

// NewUserPost response for adding a new user
func NewUserPost(ctx *context.Context) {
	form := web.GetForm(ctx).(*forms.AdminCreateUserForm)
	ctx.Data["Title"] = ctx.Tr("admin.users.new_account")
	ctx.Data["PageIsAdmin"] = true
	ctx.Data["PageIsAdminUsers"] = true
	ctx.Data["DefaultUserVisibilityMode"] = setting.Service.DefaultUserVisibilityMode
	ctx.Data["AllowedUserVisibilityModes"] = setting.Service.AllowedUserVisibilityModesSlice.ToVisibleTypeSlice()

	sources, err := auth.Sources()
	if err != nil {
		ctx.ServerError("auth.Sources", err)
		return
	}
	ctx.Data["Sources"] = sources

	ctx.Data["CanSendEmail"] = setting.MailService != nil

	if ctx.HasError() {
		ctx.HTML(http.StatusOK, tplUserNew)
		return
	}

	u := &user_model.User{
		Name:      form.UserName,
		Email:     form.Email,
		Passwd:    form.Password,
		LoginType: auth.Plain,
	}

	overwriteDefault := &user_model.CreateUserOverwriteOptions{
		IsActive:   util.OptionalBoolTrue,
		Visibility: &form.Visibility,
	}

	if len(form.LoginType) > 0 {
		fields := strings.Split(form.LoginType, "-")
		if len(fields) == 2 {
			lType, _ := strconv.ParseInt(fields[0], 10, 0)
			u.LoginType = auth.Type(lType)
			u.LoginSource, _ = strconv.ParseInt(fields[1], 10, 64)
			u.LoginName = form.LoginName
		}
	}
	if u.LoginType == auth.NoType || u.LoginType == auth.Plain {
		if len(form.Password) < setting.MinPasswordLength {
			ctx.Data["Err_Password"] = true
			ctx.RenderWithErr(ctx.Tr("auth.password_too_short", setting.MinPasswordLength), tplUserNew, &form)
			return
		}
		if !password.IsComplexEnough(form.Password) {
			ctx.Data["Err_Password"] = true
			ctx.RenderWithErr(password.BuildComplexityError(ctx), tplUserNew, &form)
			return
		}
		pwned, err := password.IsPwned(ctx, form.Password)
		if pwned {
			ctx.Data["Err_Password"] = true
			errMsg := ctx.Tr("auth.password_pwned")
			if err != nil {
				log.Error(err.Error())
				errMsg = ctx.Tr("auth.password_pwned_err")
			}
			ctx.RenderWithErr(errMsg, tplUserNew, &form)
			return
		}
		u.MustChangePassword = form.MustChangePassword
	}

	if err := user_model.CreateUser(u, overwriteDefault); err != nil {
		switch {
		case user_model.IsErrUserAlreadyExist(err):
			ctx.Data["Err_UserName"] = true
			ctx.RenderWithErr(ctx.Tr("form.username_been_taken"), tplUserNew, &form)
		case user_model.IsErrEmailAlreadyUsed(err):
			ctx.Data["Err_Email"] = true
			ctx.RenderWithErr(ctx.Tr("form.email_been_used"), tplUserNew, &form)
		case user_model.IsErrEmailCharIsNotSupported(err):
			ctx.Data["Err_Email"] = true
			ctx.RenderWithErr(ctx.Tr("form.email_invalid"), tplUserNew, &form)
		case user_model.IsErrEmailInvalid(err):
			ctx.Data["Err_Email"] = true
			ctx.RenderWithErr(ctx.Tr("form.email_invalid"), tplUserNew, &form)
		case db.IsErrNameReserved(err):
			ctx.Data["Err_UserName"] = true
			ctx.RenderWithErr(ctx.Tr("user.form.name_reserved", err.(db.ErrNameReserved).Name), tplUserNew, &form)
		case db.IsErrNamePatternNotAllowed(err):
			ctx.Data["Err_UserName"] = true
			ctx.RenderWithErr(ctx.Tr("user.form.name_pattern_not_allowed", err.(db.ErrNamePatternNotAllowed).Pattern), tplUserNew, &form)
		case db.IsErrNameCharsNotAllowed(err):
			ctx.Data["Err_UserName"] = true
			ctx.RenderWithErr(ctx.Tr("user.form.name_chars_not_allowed", err.(db.ErrNameCharsNotAllowed).Name), tplUserNew, &form)
		default:
			ctx.ServerError("CreateUser", err)
		}
		return
	}
	log.Trace("Account created by admin (%s): %s", ctx.Doer.Name, u.Name)

	// Send email notification.
	if form.SendNotify {
		mailer.SendRegisterNotifyMail(u)
	}

	ctx.Flash.Success(ctx.Tr("admin.users.new_success", u.Name))
	ctx.Redirect(setting.AppSubURL + "/admin/users/" + strconv.FormatInt(u.ID, 10))
}

func prepareUserInfo(ctx *context.Context) *user_model.User {
	u, err := user_model.GetUserByID(ctx, ctx.ParamsInt64(":userid"))
	if err != nil {
		if user_model.IsErrUserNotExist(err) {
			ctx.Redirect(setting.AppSubURL + "/admin/users")
		} else {
			ctx.ServerError("GetUserByID", err)
		}
		return nil
	}
	ctx.Data["User"] = u

	if u.LoginSource > 0 {
		ctx.Data["LoginSource"], err = auth.GetSourceByID(u.LoginSource)
		if err != nil {
			ctx.ServerError("auth.GetSourceByID", err)
			return nil
		}
	} else {
		ctx.Data["LoginSource"] = &auth.Source{}
	}

	sources, err := auth.Sources()
	if err != nil {
		ctx.ServerError("auth.Sources", err)
		return nil
	}
	ctx.Data["Sources"] = sources

	hasTOTP, err := auth.HasTwoFactorByUID(u.ID)
	if err != nil {
		ctx.ServerError("auth.HasTwoFactorByUID", err)
		return nil
	}
	hasWebAuthn, err := auth.HasWebAuthnRegistrationsByUID(u.ID)
	if err != nil {
		ctx.ServerError("auth.HasWebAuthnRegistrationsByUID", err)
		return nil
	}
	ctx.Data["TwoFactorEnabled"] = hasTOTP || hasWebAuthn

	return u
}

// EditUser show editing user page
func EditUser(ctx *context.Context) {
	ctx.Data["Title"] = ctx.Tr("admin.users.edit_account")
	ctx.Data["PageIsAdmin"] = true
	ctx.Data["PageIsAdminUsers"] = true
	ctx.Data["DisableRegularOrgCreation"] = setting.Admin.DisableRegularOrgCreation
	ctx.Data["DisableMigrations"] = setting.Repository.DisableMigrations
	ctx.Data["AllowedUserVisibilityModes"] = setting.Service.AllowedUserVisibilityModesSlice.ToVisibleTypeSlice()

	prepareUserInfo(ctx)
	if ctx.Written() {
		return
	}

	ctx.HTML(http.StatusOK, tplUserEdit)
}

// EditUserPost response for editing user
func EditUserPost(ctx *context.Context) {
	form := web.GetForm(ctx).(*forms.AdminEditUserForm)
	ctx.Data["Title"] = ctx.Tr("admin.users.edit_account")
	ctx.Data["PageIsAdmin"] = true
	ctx.Data["PageIsAdminUsers"] = true
	ctx.Data["DisableMigrations"] = setting.Repository.DisableMigrations
	ctx.Data["AllowedUserVisibilityModes"] = setting.Service.AllowedUserVisibilityModesSlice.ToVisibleTypeSlice()

	u := prepareUserInfo(ctx)
	if ctx.Written() {
		return
	}

	if ctx.HasError() {
		ctx.HTML(http.StatusOK, tplUserEdit)
		return
	}

	fields := strings.Split(form.LoginType, "-")
	if len(fields) == 2 {
		loginType, _ := strconv.ParseInt(fields[0], 10, 0)
		authSource, _ := strconv.ParseInt(fields[1], 10, 64)

		if u.LoginSource != authSource {
			u.LoginSource = authSource
			u.LoginType = auth.Type(loginType)
		}
	}

	if len(form.Password) > 0 && (u.IsLocal() || u.IsOAuth2()) {
		var err error
		if len(form.Password) < setting.MinPasswordLength {
			ctx.Data["Err_Password"] = true
			ctx.RenderWithErr(ctx.Tr("auth.password_too_short", setting.MinPasswordLength), tplUserEdit, &form)
			return
		}
		if !password.IsComplexEnough(form.Password) {
			ctx.RenderWithErr(password.BuildComplexityError(ctx), tplUserEdit, &form)
			return
		}
		pwned, err := password.IsPwned(ctx, form.Password)
		if pwned {
			ctx.Data["Err_Password"] = true
			errMsg := ctx.Tr("auth.password_pwned")
			if err != nil {
				log.Error(err.Error())
				errMsg = ctx.Tr("auth.password_pwned_err")
			}
			ctx.RenderWithErr(errMsg, tplUserEdit, &form)
			return
		}

		if err := user_model.ValidateEmail(form.Email); err != nil {
			ctx.Data["Err_Email"] = true
			ctx.RenderWithErr(ctx.Tr("form.email_error"), tplUserEdit, &form)
			return
		}

		if u.Salt, err = user_model.GetUserSalt(); err != nil {
			ctx.ServerError("UpdateUser", err)
			return
		}
		if err = u.SetPassword(form.Password); err != nil {
			ctx.ServerError("SetPassword", err)
			return
		}
	}

	if len(form.UserName) != 0 && u.Name != form.UserName {
		if err := user_setting.HandleUsernameChange(ctx, u, form.UserName); err != nil {
			if ctx.Written() {
				return
			}
			ctx.RenderWithErr(ctx.Flash.ErrorMsg, tplUserEdit, &form)
			return
		}
		u.Name = form.UserName
		u.LowerName = strings.ToLower(form.UserName)
	}

	if form.Reset2FA {
		tf, err := auth.GetTwoFactorByUID(u.ID)
		if err != nil && !auth.IsErrTwoFactorNotEnrolled(err) {
			ctx.ServerError("auth.GetTwoFactorByUID", err)
			return
		} else if tf != nil {
			if err := auth.DeleteTwoFactorByID(tf.ID, u.ID); err != nil {
				ctx.ServerError("auth.DeleteTwoFactorByID", err)
				return
			}
		}

		wn, err := auth.GetWebAuthnCredentialsByUID(u.ID)
		if err != nil {
			ctx.ServerError("auth.GetTwoFactorByUID", err)
			return
		}
		for _, cred := range wn {
			if _, err := auth.DeleteCredential(cred.ID, u.ID); err != nil {
				ctx.ServerError("auth.DeleteCredential", err)
				return
			}
		}

	}

	u.LoginName = form.LoginName
	u.FullName = form.FullName
	emailChanged := !strings.EqualFold(u.Email, form.Email)
	u.Email = form.Email
	u.Website = form.Website
	u.Location = form.Location
	u.MaxRepoCreation = form.MaxRepoCreation
	u.IsActive = form.Active
	u.IsAdmin = form.Admin
	u.IsRestricted = form.Restricted
	u.AllowGitHook = form.AllowGitHook
	u.AllowImportLocal = form.AllowImportLocal
	u.AllowCreateOrganization = form.AllowCreateOrganization

	u.Visibility = form.Visibility

	// skip self Prohibit Login
	if ctx.Doer.ID == u.ID {
		u.ProhibitLogin = false
	} else {
		u.ProhibitLogin = form.ProhibitLogin
	}

	if err := user_model.UpdateUser(ctx, u, emailChanged); err != nil {
		if user_model.IsErrEmailAlreadyUsed(err) {
			ctx.Data["Err_Email"] = true
			ctx.RenderWithErr(ctx.Tr("form.email_been_used"), tplUserEdit, &form)
		} else if user_model.IsErrEmailCharIsNotSupported(err) ||
			user_model.IsErrEmailInvalid(err) {
			ctx.Data["Err_Email"] = true
			ctx.RenderWithErr(ctx.Tr("form.email_invalid"), tplUserEdit, &form)
		} else {
			ctx.ServerError("UpdateUser", err)
		}
		return
	}
	log.Trace("Account profile updated by admin (%s): %s", ctx.Doer.Name, u.Name)

	ctx.Flash.Success(ctx.Tr("admin.users.update_profile_success"))
	ctx.Redirect(setting.AppSubURL + "/admin/users/" + url.PathEscape(ctx.Params(":userid")))
}

// DeleteUser response for deleting a user
func DeleteUser(ctx *context.Context) {
	u, err := user_model.GetUserByID(ctx, ctx.ParamsInt64(":userid"))
	if err != nil {
		ctx.ServerError("GetUserByID", err)
		return
	}

	// admin should not delete themself
	if u.ID == ctx.Doer.ID {
		ctx.Flash.Error(ctx.Tr("admin.users.cannot_delete_self"))
		ctx.Redirect(setting.AppSubURL + "/admin/users/" + url.PathEscape(ctx.Params(":userid")))
		return
	}

	if err = user_service.DeleteUser(ctx, u, ctx.FormBool("purge")); err != nil {
		switch {
		case models.IsErrUserOwnRepos(err):
			ctx.Flash.Error(ctx.Tr("admin.users.still_own_repo"))
			ctx.Redirect(setting.AppSubURL + "/admin/users/" + url.PathEscape(ctx.Params(":userid")))
		case models.IsErrUserHasOrgs(err):
			ctx.Flash.Error(ctx.Tr("admin.users.still_has_org"))
			ctx.Redirect(setting.AppSubURL + "/admin/users/" + url.PathEscape(ctx.Params(":userid")))
		case models.IsErrUserOwnPackages(err):
			ctx.Flash.Error(ctx.Tr("admin.users.still_own_packages"))
			ctx.Redirect(setting.AppSubURL + "/admin/users/" + ctx.Params(":userid"))
		default:
			ctx.ServerError("DeleteUser", err)
		}
		return
	}
	log.Trace("Account deleted by admin (%s): %s", ctx.Doer.Name, u.Name)

	ctx.Flash.Success(ctx.Tr("admin.users.deletion_success"))
	ctx.Redirect(setting.AppSubURL + "/admin/users")
}

// AvatarPost response for change user's avatar request
func AvatarPost(ctx *context.Context) {
	u := prepareUserInfo(ctx)
	if ctx.Written() {
		return
	}

	form := web.GetForm(ctx).(*forms.AvatarForm)
	if err := user_setting.UpdateAvatarSetting(ctx, form, u); err != nil {
		ctx.Flash.Error(err.Error())
	} else {
		ctx.Flash.Success(ctx.Tr("settings.update_user_avatar_success"))
	}

	ctx.Redirect(setting.AppSubURL + "/admin/users/" + strconv.FormatInt(u.ID, 10))
}

// DeleteAvatar render delete avatar page
func DeleteAvatar(ctx *context.Context) {
	u := prepareUserInfo(ctx)
	if ctx.Written() {
		return
	}

	if err := user_service.DeleteAvatar(u); err != nil {
		ctx.Flash.Error(err.Error())
	}

	ctx.Redirect(setting.AppSubURL + "/admin/users/" + strconv.FormatInt(u.ID, 10))
}
