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package main

import (
    "encoding/json""fmt""html/template""net/http""strconv"
)

type Article struct {
    ID      int    `json:"id"`
    Title   string `json:"title"`
    Content string `json:"content"`
}

var articles []Article

func homePage(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintf(w, "Welcome to the home page!")
}

func viewArticle(w http.ResponseWriter, r *http.Request) {
    id, err := strconv.Atoi(r.URL.Query().Get("id"))
    if err != nil || id < 1 || id > len(articles) {
        http.NotFound(w, r)
        return
    }

    article := articles[id-1]

    tpl := template.Must(template.ParseFiles("article.html"))
    tpl.Execute(w, article)
}

func createArticle(w http.ResponseWriter, r *http.Request) {
    if r.Method == "GET" {
        tpl := template.Must(template.ParseFiles("create.html"))
        tpl.Execute(w, nil)
    } else {
        title := r.FormValue("title")
        content := r.FormValue("content")
        articles = append(articles, Article{ID: len(articles) + 1, Title: title, Content: content})
        http.Redirect(w, r, "/", http.StatusSeeOther)
    }
}

func updateArticle(w http.ResponseWriter, r *http.Request) {
    id, err := strconv.Atoi(r.URL.Query().Get("id"))
    if err != nil || id < 1 || id > len(articles) {
        http.NotFound(w, r)
        return
    }

    article := &articles[id-1]

    if r.Method == "GET" {
        tpl := template.Must(template.ParseFiles("update.html"))
        tpl.Execute(w, article)
    } else {
        title := r.FormValue("title")
        content := r.FormValue("content")
        article.Title = title
        article.Content = content
        http.Redirect(w, r, "/", http.StatusSeeOther)
    }
}

func main() {
    // Retrieve articles from external API
    response, err := http.Get("https://jsonplaceholder.typicode.com/posts")
    if err != nil {
        panic(err)
    }
    defer response.Body.Close()

    err = json.NewDecoder(response.Body).Decode(&articles)
    if err != nil {
        panic(err)
    }

    // Define routes
    http.HandleFunc("/", homePage)
    http.HandleFunc("/article", viewArticle)
    http.HandleFunc("/create", createArticle)
    http.HandleFunc("/update", updateArticle)

    // Start server
    fmt.Println("Server started on http://localhost:8080")
    http.ListenAndServe(":8080", nil)
}