package handlers

import (
	"net/http"

	"github.com/gin-gonic/gin"
	"github.com/google/uuid"
	"gorm.io/gorm"

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

// PrivacyOptOut sets the CCPA "Do Not Sell" preference for the authenticated user.
// v0.803 SEC2-06: CCPA compliance - honors user opt-out request.
//
// @Summary      CCPA Do Not Sell opt-out
// @Description  Saves the user's Do Not Sell preference (CCPA compliance)
// @Tags         Users
// @Security     BearerAuth
// @Success      200  {object}  map[string]interface{}
// @Failure      401  {object}  map[string]interface{}
// @Failure      500  {object}  map[string]interface{}
// @Router       /users/me/privacy/opt-out [post]
func PrivacyOptOut(db *gorm.DB) gin.HandlerFunc {
	return func(c *gin.Context) {
		userID, ok := GetUserIDUUID(c)
		if !ok || userID == uuid.Nil {
			RespondWithAppError(c, apperrors.NewUnauthorizedError("Authentication required"))
			return
		}

		// Upsert user_preferences with do_not_sell in privacy JSONB
		// Uses PostgreSQL jsonb_set to merge do_not_sell: true into existing privacy
		result := db.Exec(`
			INSERT INTO user_preferences (user_id, theme, language, timezone, notifications, privacy, audio, contrast, density, accent_hue, font_size, updated_at)
			VALUES ($1, 'light', 'en', 'UTC', '{}', '{"do_not_sell": true}', '{}', 'normal', 'comfortable', 220, 16, NOW())
			ON CONFLICT (user_id) DO UPDATE SET
				privacy = COALESCE(user_preferences.privacy, '{}')::jsonb || '{"do_not_sell": true}'::jsonb,
				updated_at = NOW()
		`, userID)

		if result.Error != nil {
			RespondWithAppError(c, apperrors.NewInternalErrorWrap("Failed to save privacy preference", result.Error))
			return
		}

		RespondSuccess(c, http.StatusOK, gin.H{"message": "Do Not Sell preference saved"})
	}
}