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package services
import (
"fmt"
"regexp"
"shrine/enums"
"shrine/messages"
"shrine/models"
"shrine/repositories"
"shrine/types/hypertext"
"shrine/types/letter"
"shrine/types/ticket"
"shrine/types/user"
"shrine/utils/sanitize"
"strings"
)
func ResolveUser(username string) (*models.User, *hypertext.ServiceError) {
citizen, err := repositories.FindUserByUsername(username)
if err != nil {
return nil, fail(enums.NotFound, messages.UserNotFound)
}
return citizen, nil
}
func mapRegistrationError(err error) *hypertext.ServiceError {
return mapUserError(err)
}
func mapUserError(err error) *hypertext.ServiceError {
if strings.Contains(err.Error(), "users.username") {
return fail(enums.Conflict, messages.UsernameAlreadyExists)
}
if strings.Contains(err.Error(), "users.email") {
return fail(enums.Conflict, messages.EmailAlreadyExists)
}
return fail(enums.BadRequest, err.Error())
}
func assembleLetterResponse(record *models.Letter, viewerID uint) letter.LetterResponse {
participants := repositories.GetLetterParticipants(record.ID)
lastMessage := repositories.GetLastMessage(record.ID)
viewer, _ := repositories.GetParticipantRecord(record.ID, viewerID)
var unread bool
if viewer != nil && lastMessage != nil {
unread = viewer.LastReadAt == nil || lastMessage.CreatedAt.After(*viewer.LastReadAt)
}
var lastMessageResponse *letter.MessageResponse
if lastMessage != nil {
response := lastMessage.ToResponse()
lastMessageResponse = &response
}
return letter.LetterResponse{
Ref: record.Ref,
Title: computeTitle(record, participants, viewerID),
IsSystem: record.IsSystem,
SystemRef: record.SystemRef,
Participants: buildParticipantResponses(participants),
LastMessage: lastMessageResponse,
Unread: unread,
UpdatedAt: record.UpdatedAt,
}
}
func computeTitle(record *models.Letter, participants []models.LetterParticipant, viewerID uint) string {
if record.Title != "" {
return record.Title
}
if record.IsSystem {
return messages.SystemMessageTitle
}
var others []string
for _, participant := range participants {
if participant.UserID != viewerID {
others = append(others, participant.User.DisplayName)
}
}
switch len(others) {
case 0:
return messages.EmptyConversationTitle
case 1:
return others[0]
case 2:
return fmt.Sprintf(messages.LetterTitleTwo, others[0], others[1])
default:
return fmt.Sprintf(messages.LetterTitleMany, others[0], others[1], len(others)-2)
}
}
func buildParticipantResponses(participants []models.LetterParticipant) []letter.ParticipantResponse {
responses := make([]letter.ParticipantResponse, len(participants))
for index, participant := range participants {
responses[index] = participant.ToResponse()
}
return responses
}
func buildMessageResponses(letterMessages []models.LetterMessage) []letter.MessageResponse {
responses := make([]letter.MessageResponse, len(letterMessages))
for index, message := range letterMessages {
responses[index] = message.ToResponse()
}
return responses
}
func resolveLetter(ref string, userID uint) (*models.Letter, *hypertext.ServiceError) {
record, err := repositories.FindLetterByRef(ref)
if err != nil {
return nil, fail(enums.NotFound, messages.LetterNotFound)
}
if !repositories.IsLetterParticipant(record.ID, userID) {
return nil, fail(enums.NotFound, messages.LetterNotFound)
}
return record, nil
}
func resolveTicket(ref string) (*models.Ticket, *hypertext.ServiceError) {
record, err := repositories.FindTicketByRef(ref)
if err != nil {
return nil, fail(enums.NotFound, messages.TicketNotFound)
}
return record, nil
}
func sanitizeRequiredBody(body string) (string, *hypertext.ServiceError) {
sanitized := sanitize.HTML(body)
if sanitized == "" {
return "", fail(enums.BadRequest, messages.MessageBodyRequired)
}
return sanitized, nil
}
func buildTicketMessageResponses(ticketMessages []models.TicketMessage) []ticket.MessageResponse {
responses := make([]ticket.MessageResponse, len(ticketMessages))
for index, message := range ticketMessages {
responses[index] = message.ToResponse()
}
return responses
}
func buildCitizenSummaries(citizens []models.User) []user.CitizenSummaryResponse {
summaries := make([]user.CitizenSummaryResponse, len(citizens))
for index, citizen := range citizens {
summaries[index] = citizen.ToSummary()
}
return summaries
}
var imgSrcPattern = regexp.MustCompile(`<img\s+[^>]*src="([^"]+)"`)
func extractImageURL(html string) string {
match := imgSrcPattern.FindStringSubmatch(html)
if len(match) < 2 {
return ""
}
return match[1]
}
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