package server

import (
  "fmt"
  "http"
  "io"
  "json"
  "os"
  "path"
)

const kFrontEndFiles = "/Users/rsesek/Projects/armadillo/out/fe/"

func indexHandler(connection *http.Conn, request *http.Request) {
  fd, err := os.Open(path.Join(kFrontEndFiles, "index.html"), os.O_RDONLY, 0)
  if err != nil {
    fmt.Print("Error opening file ", err.String(), "\n")
    return
  }
  io.Copy(connection, fd)
}

func serviceHandler(connection *http.Conn, request *http.Request) {
  if request.Method != "POST" {
    io.WriteString(connection, "Error: Not a POST request")
    return
  }
  
  switch request.FormValue("action") {
    case "list":
      okResponse(connection, "Request received")
      return
  }
  
  errorResponse(connection, "Unhandled action")
}

func errorResponse(connection *http.Conn, message string) {
  response := map[string] string {
    "error": "-1",
    "message": message,
  }
  json_data, err := json.Marshal(response)

  connection.SetHeader("Content-Type", "text/json")
  if err != nil {
    io.WriteString(connection, "{\"error\":\"-9\",\"message\":\"Internal encoding error\"}")
  } else {
    connection.Write(json_data)
  }
}

func okResponse(connection *http.Conn, data interface{}) {
  connection.SetHeader("Content-Type", "text/json")
  json_data, err := json.Marshal(data)
  if err != nil {
    errorResponse(connection, "Internal encoding error")
  } else {
    connection.Write(json_data)
  }
}

func RunFrontEnd() {
  mux := http.NewServeMux()
  mux.HandleFunc("/", indexHandler)
  mux.Handle("/fe/", http.FileServer(kFrontEndFiles, "/fe/"))
  mux.HandleFunc("/service", serviceHandler)

  error := http.ListenAndServe(":8084", mux)
  fmt.Printf("error %v", error)
}