basic frontend (#3)

Co-authored-by: aovantsev <aovantsev@avito.ru>
Reviewed-on: #3

models.go

@@ -0,0 +1,92 @@
+package main
+
+import (
+	"time"
+)
+
+// User represents a registered user
+type User struct {
+	ID        int       `json:"id" db:"id"`
+	Username  string    `json:"username" db:"username"`
+	Email     string    `json:"email" db:"email"`
+	Password  string    `json:"-" db:"password"` // Hidden from JSON
+	CreatedAt time.Time `json:"created_at" db:"created_at"`
+	UpdatedAt time.Time `json:"updated_at" db:"updated_at"`
+}
+
+// Counter represents a counter entity
+type Counter struct {
+	ID          int       `json:"id" db:"id"`
+	UserID      *int      `json:"user_id,omitempty" db:"user_id"` // nil for anonymous users
+	Name        string    `json:"name" db:"name"`
+	Description string    `json:"description" db:"description"`
+	CreatedAt   time.Time `json:"created_at" db:"created_at"`
+	UpdatedAt   time.Time `json:"updated_at" db:"updated_at"`
+}
+
+// CounterEntry represents a single increment/decrement entry
+type CounterEntry struct {
+	ID        int       `json:"id" db:"id"`
+	CounterID int       `json:"counter_id" db:"counter_id"`
+	Value     int       `json:"value" db:"value"` // +1 for increment, -1 for decrement
+	Date      time.Time `json:"date" db:"date"`
+	CreatedAt time.Time `json:"created_at" db:"created_at"`
+}
+
+// CounterWithStats represents a counter with aggregated statistics
+type CounterWithStats struct {
+	Counter
+	TotalValue int `json:"total_value"`
+	TodayValue int `json:"today_value"`
+	WeekValue  int `json:"week_value"`
+	MonthValue int `json:"month_value"`
+	EntryCount int `json:"entry_count"`
+}
+
+// AnonymousCounter represents a counter for anonymous users (stored in localStorage)
+type AnonymousCounter struct {
+	ID          string         `json:"id"`
+	Name        string         `json:"name"`
+	Description string         `json:"description"`
+	TotalValue  int            `json:"total_value"`
+	Entries     map[string]int `json:"entries"` // date -> count
+	CreatedAt   time.Time      `json:"created_at"`
+	UpdatedAt   time.Time      `json:"updated_at"`
+}
+
+// Request/Response DTOs
+
+type RegisterRequest struct {
+	Username string `json:"username" binding:"required,min=3,max=50"`
+	Email    string `json:"email" binding:"required,email"`
+	Password string `json:"password" binding:"required,min=6"`
+}
+
+type LoginRequest struct {
+	Username string `json:"username" binding:"required"`
+	Password string `json:"password" binding:"required"`
+}
+
+type AuthResponse struct {
+	Token string `json:"token"`
+	User  User   `json:"user"`
+}
+
+type CreateCounterRequest struct {
+	Name        string `json:"name" binding:"required,min=1,max=100"`
+	Description string `json:"description" max:"500"`
+}
+
+type UpdateCounterRequest struct {
+	Name        string `json:"name" binding:"required,min=1,max=100"`
+	Description string `json:"description" max:"500"`
+}
+
+type IncrementRequest struct {
+	Value int `json:"value" binding:"required"`
+}
+
+type CounterStatsRequest struct {
+	StartDate *time.Time `json:"start_date"`
+	EndDate   *time.Time `json:"end_date"`
+}