// Package handler provides HTTP handlers for various endpoints.
package handler

import (
	"net/http"

	"modelRT/logger"
	"modelRT/model"
	"modelRT/network"

	"github.com/gin-gonic/gin"
)

// MeasurementRecommendHandler define measurement recommend API
func MeasurementRecommendHandler(c *gin.Context) {
	var request network.MeasurementRecommendRequest

	if err := c.ShouldBindJSON(&request); err != nil {
		logger.Error(c, "failed to unmarshal measurement recommend request", "error", err)
		c.JSON(http.StatusOK, network.FailureResponse{
			Code: http.StatusBadRequest,
			Msg:  err.Error(),
		})
		return
	}

	recommends, err := model.RedisSearchRecommend(c, request.Input)
	if err != nil {
		logger.Error(c, "failed to get recommend data from redis", "input", request.Input, "error", err)
		c.JSON(http.StatusOK, network.FailureResponse{
			Code: http.StatusInternalServerError,
			Msg:  err.Error(),
			PayLoad: map[string]interface{}{
				"input": request.Input,
			},
		})
		return
	}

	var minOffset int
	for index, recommend := range recommends {
		offset := model.GetLongestCommonPrefixLength(request.Input, recommend)
		if index == 0 || offset < minOffset {
			minOffset = offset
		}
	}

	c.JSON(http.StatusOK, network.SuccessResponse{
		Code: http.StatusOK,
		Msg:  "success",
		PayLoad: map[string]interface{}{
			"input":            request.Input,
			"offset":           minOffset,
			"recommended_list": recommends,
		},
	})
}