package main

import (
	"encoding/json"
	"fmt"
	"net/http"
	"os"
	"path/filepath"
	"sort"
	"strings"
	"time"
)

type NewsItem struct {
	Timestamp time.Time `json:"timestamp"`
	Title     string    `json:"title"`
	Content   string    `json:"content"`
	Author    string    `json:"author"`
}

// Função para listar e ordenar arquivos .md
func getMarkdownFiles() ([]NewsItem, error) {
	dirPath := "./news" // Assumindo que os arquivos .md estão na pasta 'news'
	var newsItems []NewsItem

	err := filepath.Walk(dirPath, func(path string, info os.FileInfo, err error) error {
		if err != nil {
			return err
		}

		if !info.IsDir() && strings.HasSuffix(info.Name(), ".md") {
			parts := strings.Split(info.Name(), "-")
			if len(parts) < 7 {
				return nil // Ignora arquivos que não estão no formato esperado
			}

			year, month, day := parts[0], parts[1], parts[2]
			hour, minute := parts[3], parts[4]
			author := strings.ReplaceAll(parts[5], "_", " ")
			title := strings.TrimSuffix(strings.ReplaceAll(parts[6], "_", " "), ".md")

			timestamp, err := time.Parse("2006-01-02T15:04", fmt.Sprintf("%s-%s-%sT%s:%s", year, month, day, hour, minute))
			if err != nil {
				return err
			}

			content, err := os.ReadFile(path)
			if err != nil {
				return err
			}

			newsItems = append(newsItems, NewsItem{
				Timestamp: timestamp,
				Title:     title,
				Content:   string(content),
				Author:    author,
			})
		}
		return nil
	})

	if err != nil {
		return nil, err
	}

	// Ordena os arquivos por timestamp em ordem decrescente
	sort.Slice(newsItems, func(i, j int) bool {
		return newsItems[i].Timestamp.After(newsItems[j].Timestamp)
	})

	return newsItems, nil
}

// Endpoint para retornar a lista de arquivos .md como JSON
func newsHandler(w http.ResponseWriter, r *http.Request) {
	newsItems, err := getMarkdownFiles()
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(newsItems)
}