MyNSB/API

package belltimes

import (
    json2 "encoding/json"
    "errors"
    "github.com/julienschmidt/httprouter"
    "mynsb-api/internal/quickerrors"
    "mynsb-api/internal/sessions"
    "mynsb-api/internal/util"
    "net/http"
    "strconv"
)


// RETRIEVAL FUNCTIONS

// getBellTimes takes a set of parameters and returns the belltimes in accordance to those params
func getBellTimes(term string, day string, assembly bool) string {

    json := []byte{}
    // Pull the data from the file
    timetable := timetableData


    if term == "2" || term == "3" {
        // Convert to non crawford shield timetableData
        timetable["Thursday"]["Lunch"] = "12:38pm - 1:17pm"
    }
    if !assembly {
        // Switch monday with friday
        val := timetable["Friday"]
        timetable["Monday"] = val
    }

    // Determine what to return
    if day == "" {
        json, _ = json2.Marshal(timetable)
    } else {
        table := timetable[day]
        json, _ = json2.Marshal(table)
    }

    return string(json)
}












// UTILITY FUNCTIONS

// getParams takes a http request and returns the user parameters from it
func getParams(r *http.Request) (map[string]interface{}, error) {

    term := r.URL.Query().Get("Term")
    day := r.URL.Query().Get("Day")
    assemblyRaw := r.URL.Query().Get("Assembly")

    assembly := false

    // Convert assembly to a boolean
    if util.NonNull(assemblyRaw) {
        var err error
        assembly, err = strconv.ParseBool(assemblyRaw)
        if err != nil {
            return nil, errors.New("assembly is not boolean")
        }
    }


    return map[string]interface{}{
        "term": term,
        "day": day,
        "assembly": assembly,
    }, nil
}












// HTTP HANDLERS

// RetrievalHandler is a http handler that handles requests for the belltimes
func RetrievalHandler(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {

    allowed, _ := sessions.IsUserAllowed(r, w, "user")
    if !allowed {
        quickerrors.NotEnoughPrivileges(w)
        return
    }

    params, err := getParams(r)
    if err != nil {
        quickerrors.MalformedRequest(w, "Assembly is not boolean")
        return
    }

    belltimes := getBellTimes(
        params["term"].(string),
        params["day"].(string),
        params["assembly"].(bool))

    // Return the error
    util.HTTPResponse(200, "OK", belltimes, "Response", w)
}