feat(tags): creating and getting user tags

backend/models/tags.go

@@ -0,0 +1,78 @@
+package models
+
+import (
+	"screenmark/screenmark/.gen/haystack/haystack/model"
+	. "screenmark/screenmark/.gen/haystack/haystack/table"
+
+	. "github.com/go-jet/jet/v2/postgres"
+	"github.com/google/uuid"
+)
+
+// Raw dogging SQL is kinda based though?
+//
+// |            nO, usE OrM!!
+//
+// |        RAW      -     RAW
+// |        SQL     | \    SQL
+// |        GOOD   |   \   GOOD
+// |              -     -
+// |            --       --
+// |           --         --
+// |       ----      IQ     ----
+func getNonExistantTags(userId uuid.UUID, tags []string) ([]string, error) {
+	stmt, err := db.Prepare(`WITH given_tags 
+        AS (SELECT given_tags.tag FROM (VALUES ('a'), ('b'), ('c')) AS given_tags (tag))
+		SELECT given_tags.tag
+		FROM given_tags
+		LEFT OUTER JOIN haystack.user_tags ON haystack.user_tags.tag = a.tag
+		where user_tags.tag is null;`)
+
+	if err != nil {
+		return []string{}, err
+	}
+
+	defer stmt.Close()
+
+	rows, err := stmt.Query()
+	if err != nil {
+		return []string{}, err
+	}
+
+	nonExistantTags := make([]string, 0)
+
+	for rows.Next() {
+		var tag string
+		rows.Scan(&tag)
+
+		nonExistantTags = append(nonExistantTags, tag)
+	}
+
+	return nonExistantTags, nil
+}
+
+func CreateTags(userId uuid.UUID, tags []string) error {
+	tagsToInsert, err := getNonExistantTags(userId, tags)
+	if err != nil {
+		return err
+	}
+
+	stmt := UserTags.INSERT(UserTags.UserID, UserTags.Tag)
+
+	for _, tag := range tagsToInsert {
+		stmt = stmt.VALUES(UUID(userId), tag)
+	}
+
+	_, err = stmt.Exec(db)
+
+	return err
+}
+
+func GetTags(userId uuid.UUID) ([]model.UserTags, error) {
+	stmt := UserTags.SELECT(UserTags.AllColumns).WHERE(UserTags.UserID.EQ(UUID(userId)))
+
+	userTags := []model.UserTags{}
+
+	err := stmt.Query(db, &userTags)
+
+	return userTags, err
+}