package handler

import (
	"encoding/json"
	"net/http"
	"os"

	"github.com/go-chi/chi/v5"
	"github.com/jmoiron/sqlx"

	"github.com/daniil/homelab-api/internal/service"
)

type InterestHandler struct {
	service   *service.InterestService
	secretKey string
}

func NewInterestHandler(db *sqlx.DB) *InterestHandler {
	secretKey := os.Getenv("INTERNAL_API_KEY")
	if secretKey == "" {
		secretKey = "pulse-internal-2026"
	}
	return &InterestHandler{
		service:   service.NewInterestService(db),
		secretKey: secretKey,
	}
}

// RegisterRoutes регистрирует internal routes
func (h *InterestHandler) RegisterRoutes(r chi.Router) {
	r.Post("/internal/calculate-interest", h.CalculateInterest)
}

// CalculateInterest запускает расчёт процентов для всех вкладов
// POST /internal/calculate-interest
// Header: X-Internal-Key: <secret>
func (h *InterestHandler) CalculateInterest(w http.ResponseWriter, r *http.Request) {
	// Verify internal API key
	key := r.Header.Get("X-Internal-Key")
	if key != h.secretKey {
		http.Error(w, "Unauthorized", http.StatusUnauthorized)
		return
	}
	
	results, err := h.service.CalculateAllDepositsInterest()
	if err != nil {
		w.Header().Set("Content-Type", "application/json")
		json.NewEncoder(w).Encode(map[string]string{"error": err.Error()})
		return
	}
	
	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(map[string]interface{}{
		"message": "Interest calculation completed",
		"results": results,
	})
}