// Minimal jim-bot web interface wrapper which generates 10 random
// corporate gibberish sentences on page load.
package main

import (
  "encoding/json"
  "log"
  "net/http"
  "strings"

  "pablotron.org/jim-bot/bot"
)

// Send response as JSON-encoded array.
func doHomeJson(w http.ResponseWriter) {
  // generate sentences
  sentences := bot.N(10)

  // write response header and body
  w.Header().Add("Content-Type", "application/json")
  if err := json.NewEncoder(w).Encode(sentences); err != nil {
    log.Print(err)
  }
}

// Send response as newline-delimited text.
func doHomeText(w http.ResponseWriter) {
  // generate response body
  body := []byte(strings.Join(bot.N(10), "\n") + "\n")

  // write response header and body
  w.Header().Add("Content-Type", "text/plain")
  if _, err := w.Write(body); err != nil {
    log.Print(err)
  }
}

// Home page handler.
//
// By default this handler responds with a newline-delimited list of
// sentences.  However if both of the following conditions are true,
// then the response is a JSON-encoded array of sentences:
//
// - The request method is POST
// - The request Accept header is "application/json"
func doHome(w http.ResponseWriter, r *http.Request) {
  if r.Method == http.MethodPost && r.Header.Get("Accept") == "application/json" {
    doHomeJson(w) // send json
  } else {
    doHomeText(w) // send text
  }
}

func main() {
  http.HandleFunc("/", doHome)
  http.ListenAndServe(":8080", nil)
}