package tender

import (
	"strings"

	"go.mongodb.org/mongo-driver/v2/bson"
)

const aiProcedurePrefix = "PROC_"

// FormatAIProcedureRef builds the AI service tender reference:
// PROC_{contract_folder_id}/{notice_publication_id}
func FormatAIProcedureRef(contractFolderID, noticePublicationID string) string {
	contractFolderID = strings.TrimSpace(contractFolderID)
	noticePublicationID = strings.TrimSpace(noticePublicationID)
	if contractFolderID == "" || noticePublicationID == "" {
		return ""
	}
	return aiProcedurePrefix + contractFolderID + "/" + noticePublicationID
}

// ProcedureReference identifies a tender using AI procedure coordinates.
type ProcedureReference struct {
	Ref                 string
	ContractFolderID    string
	NoticePublicationID string
}

// ParseAIProcedureRef parses PROC_{contract_folder_id}/{notice_publication_id}.
func ParseAIProcedureRef(ref string) (contractFolderID, noticePublicationID string, ok bool) {
	ref = strings.TrimSpace(ref)
	if ref == "" {
		return "", "", false
	}

	withoutPrefix := ref
	if len(ref) >= len(aiProcedurePrefix) && strings.EqualFold(ref[:len(aiProcedurePrefix)], aiProcedurePrefix) {
		withoutPrefix = ref[len(aiProcedurePrefix):]
	}

	slash := strings.Index(withoutPrefix, "/")
	if slash <= 0 || slash >= len(withoutPrefix)-1 {
		return "", "", false
	}

	contractFolderID = strings.TrimSpace(withoutPrefix[:slash])
	noticePublicationID = strings.TrimSpace(withoutPrefix[slash+1:])
	if contractFolderID == "" || noticePublicationID == "" {
		return "", "", false
	}

	return contractFolderID, noticePublicationID, true
}

func tenderMatchesProcedureRef(t Tender, contractFolderID, noticePublicationID string) bool {
	if strings.TrimSpace(t.ContractFolderID) != strings.TrimSpace(contractFolderID) {
		return false
	}
	if t.NoticePublicationID == noticePublicationID {
		return true
	}
	for _, related := range t.RelatedNoticePublicationIDs {
		if related == noticePublicationID {
			return true
		}
	}
	return false
}

// IsMongoObjectIDRef reports whether ref is a 24-char hex MongoDB ObjectId.
func IsMongoObjectIDRef(ref string) bool {
	ref = strings.TrimSpace(ref)
	if len(ref) != 24 {
		return false
	}
	_, err := bson.ObjectIDFromHex(ref)
	return err == nil
}