// Package handler define HTTP handler functions for eventRT service
package handler

import (
	"errors"
	"net/http"

	"eventRT/constants"
	"eventRT/database"
	"eventRT/event"
	"eventRT/logger"

	"github.com/gin-gonic/gin"
	"go.mongodb.org/mongo-driver/bson"
	"go.mongodb.org/mongo-driver/mongo"
)

// GetEventHandler handles GET /events/:event_uuid
func GetEventHandler(c *gin.Context) {
	ctx := c.Request.Context()
	eventUUID := c.Param("event_uuid")

	var record event.EventRecord
	err := database.GetMongoClient().
		Database(constants.EventDBName).
		Collection(constants.EventCollectionName).
		FindOne(ctx, bson.M{"event_uuid": eventUUID}).
		Decode(&record)
	if err != nil {
		if errors.Is(err, mongo.ErrNoDocuments) {
			c.JSON(http.StatusNotFound, gin.H{"error": "event not found"})
			return
		}
		logger.Error(ctx, "query event by uuid failed", "event_uuid", eventUUID, "error", err)
		c.JSON(http.StatusInternalServerError, gin.H{"error": "internal server error"})
		return
	}

	c.JSON(http.StatusOK, record)
}