package main

import (
	"encoding/csv"
	"encoding/json"
	"fmt"
	"io/ioutil"
	"os"
)

type Tweets []struct {
	Fullname  string `json:"fullname"`
	ID        string `json:"id"`
	Text      string `json:"text"`
	Timestamp string `json:"timestamp"`
	User      string `json:"user"`
}

func main() {
	if len(os.Args) < 3 {
		fmt.Printf("Usage: %s infile.json outfile.csv (order is important, name doesn't matter)", os.Args[0])
		os.Exit(1)
	}

	infile, err := ioutil.ReadFile(os.Args[1])
	if err != nil {
		panic(err)
	}

	var JSONTweets Tweets
	err = json.Unmarshal([]byte(infile), &JSONTweets)
	if err != nil {
		panic(err)
	}

	out, err := os.Create(os.Args[2])
	if err != nil {
		panic(err)
	}
	defer out.Close()

	w := csv.NewWriter(out)

	w.Write([]string{"timestamp", "text"})
	for _, obj := range JSONTweets {
		var record []string
		record = append(record, obj.Timestamp)
		record = append(record, obj.Text)
		w.Write(record)
	}
	w.Flush()
}