package handlers

import (
	"net/http"

	"github.com/gin-gonic/gin"

	apperrors "veza-backend-api/internal/errors"
	"veza-backend-api/internal/services"
)

// FeatureFlagHandler handles feature flag endpoints (v0.803 ADM1-05)
type FeatureFlagHandler struct {
	svc *services.FeatureFlagService
}

// NewFeatureFlagHandler creates a new FeatureFlagHandler
func NewFeatureFlagHandler(svc *services.FeatureFlagService) *FeatureFlagHandler {
	return &FeatureFlagHandler{svc: svc}
}

// List returns all feature flags (admin)
func (h *FeatureFlagHandler) List(c *gin.Context) {
	list, err := h.svc.List(c.Request.Context())
	if err != nil {
		RespondWithAppError(c, apperrors.NewInternalErrorWrap("Failed to list feature flags", err))
		return
	}
	c.JSON(http.StatusOK, gin.H{"feature_flags": list})
}

// Toggle enables or disables a feature flag (admin)
func (h *FeatureFlagHandler) Toggle(c *gin.Context) {
	name := c.Param("name")
	if name == "" {
		RespondWithAppError(c, apperrors.NewValidationError("name is required"))
		return
	}

	var req struct {
		Enabled bool `json:"enabled"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		RespondWithAppError(c, apperrors.NewValidationError("enabled is required"))
		return
	}

	flag, err := h.svc.Toggle(c.Request.Context(), name, req.Enabled)
	if err != nil {
		RespondWithAppError(c, apperrors.NewInternalErrorWrap("Failed to toggle feature flag", err))
		return
	}
	c.JSON(http.StatusOK, flag)
}