package main

import (
	"bytes"
	_ "embed"
	"encoding/json"
	"fmt"
	"os"
	"os/exec"
	"text/template"
)

const statsPath = "/usr/local/bin/stats"

//go:embed feed.tmpl.xml
var feedTmpl string

type newsEntry struct {
	Title   string // Title of entry
	Pubdate string // Human readable date
	Content string // HTML of entry
}

type tildeData struct {
	News        []newsEntry
}

func _main() error {
	data, err := stats()
	if err != nil {
		return err
	}

	type tmplData struct {
		News   []newsEntry
	}

	td := &tmplData{
		News:   data.News,
	}

	t, err := template.New("feed").Parse(feedTmpl)
	if err != nil {
		return fmt.Errorf("failed to parse the feed template: %w", err)
	}

	out := bytes.Buffer{}
	if err = t.Execute(&out, td); err != nil {
		return fmt.Errorf("failed to render feed template: %w", err)
	}

	fmt.Println(out.String())

	return nil
}

func stats() (*tildeData, error) {
	sout := bytes.Buffer{}
	cmd := exec.Command(statsPath)
	cmd.Stdout = &sout

	err := cmd.Run()
	if err != nil {
		return nil, err
	}

	var data tildeData

	err = json.Unmarshal(sout.Bytes(), &data)
	if err != nil {
		return nil, err
	}

	return &data, nil
}

func main() {
	err := _main()
	if err != nil {
		fmt.Fprintf(os.Stderr, "error: %s\n", err)
		os.Exit(1)
	}
}