Add initial database setup and user/artist management functionality

api/handlers/user_handler.go

@@ -0,0 +1,75 @@
+package handlers
+
+import (
+	"net/http"
+	db "zardzul/music-index/sqlc"
+
+	"zardzul/music-index/repository"
+
+	"github.com/gin-gonic/gin"
+	"github.com/google/uuid"
+	"github.com/jackc/pgx/v5/pgtype"
+)
+
+type UserHandler struct {
+	repo repository.UserRepository
+}
+
+func NewUserHandler(repo repository.UserRepository) *UserHandler {
+	return &UserHandler{repo: repo}
+}
+
+type createUserRequest struct {
+	UserName string `json:"user_name" binding:"required"`
+	UserMail string `json:"user_mail" binding:"required,email"`
+	Password string `json:"password" binding:"required,min=8"`
+}
+
+func (h *UserHandler) CreateUser(c *gin.Context) {
+	var req createUserRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+
+	var pgID pgtype.UUID
+	if err := pgID.Scan(uuid.New().String()); err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to generate user id"})
+		return
+	}
+
+	id, err := h.repo.CreateUser(c.Request.Context(), db.CreateUserParams{
+		ID:       pgID,
+		UserName: req.UserName,
+		UserMail: req.UserMail,
+		Password: req.Password, // TODO: hash this before storing
+	})
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.JSON(http.StatusCreated, gin.H{
+		"message": "user created",
+		"id":      id.String(),
+	})
+}
+
+func (h *UserHandler) GetUsernameByID(c *gin.Context) {
+	idParam := c.Param("id")
+	var pgID pgtype.UUID
+	if err := pgID.Scan(idParam); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid user id"})
+		return
+	}
+
+	username, err := h.repo.GetUsernameByID(c.Request.Context(), pgID)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.JSON(http.StatusOK, gin.H{
+		"user_name": username,
+	})
+}