package main

import (
	"fmt"
	"os"
	"strings"
	"text/template"
)

type (
	blogRec struct {
		URL    string
		Title  string
		Author string
	}
)

func genRecs() {
	fmt.Println("Generating blog recommendations...")
	recList := genBlogRecs()
	fmt.Println("Generating blog recommendation RSS...")
	genRSSBlogRecs(recList)
}

func readBlogRecs() []blogRec {
	// read file
	content, err := os.ReadFile("templates/blogrecs.txt")
	if err != nil {
		fmt.Printf("ERROR reading blogrecs file: %s\n", err)
	}

	state := 0            // 1 url, 2 title, 3 author
	var b strings.Builder // builder for string parsing

	var recList []blogRec

	for _, char := range content {
		switch state {
		case 0:
			recList = append(recList, blogRec{})
			state = 1
		case 1:
			if char == '\n' {
				recList[len(recList)-1].URL = b.String()
				b.Reset()
				state = 2
			}
			b.WriteByte(char)
		case 2:
			if char == '\n' {
				recList[len(recList)-1].Title = b.String()
				b.Reset()
				state = 3
			}
			b.WriteByte(char)
		case 3:
			if char == '\n' {
				recList[len(recList)-1].Author = b.String()
				b.Reset()
				state = 0
			}
			b.WriteByte(char)
		}
	}

	return recList
}

func genBlogRecs() []blogRec {
	recList := readBlogRecs()

	// template
	tpl, err := template.ParseFiles("templates/blogrecs.html.gotmpl")
	if err != nil {
		fmt.Printf("ERROR creating template: %s\n", err)
	}

	f, err := os.Create("html/en/blogrecs.html")
	if err != nil {
		fmt.Printf("ERROR creating html: %s\n", err)
		panic(1)
	}

	err = tpl.ExecuteTemplate(f, "blogrecs.html.gotmpl", recList)
	if err != nil {
		fmt.Printf("ERROR executing template: %s\n", err)
	}

	return recList
}