package handlers

import (
	"context"
	"encoding/json"
	"net/http"
	"time"

	"github.com/jmoiron/sqlx"
)

type HealthHandler struct {
	db        *sqlx.DB
	version   string
	startedAt time.Time
}

func NewHealthHandler(db *sqlx.DB, version string) *HealthHandler {
	return &HealthHandler{db: db, version: version, startedAt: time.Now()}
}

func (h *HealthHandler) Healthz(w http.ResponseWriter, r *http.Request) {
	ctx, cancel := context.WithTimeout(r.Context(), 2*time.Second)
	defer cancel()
	dbOK := h.db.PingContext(ctx) == nil
	status := http.StatusOK
	if !dbOK {
		status = http.StatusServiceUnavailable
	}
	w.Header().Set("content-type", "application/json")
	w.WriteHeader(status)
	_ = json.NewEncoder(w).Encode(map[string]any{
		"ok":         dbOK,
		"version":    h.version,
		"uptime_s":   int(time.Since(h.startedAt).Seconds()),
		"checked_at": time.Now().UTC().Format(time.RFC3339),
	})
}