changed project structure, began web development

web/web.go

@@ -0,0 +1,153 @@
+package web
+
+import (
+	"context"
+	"fmt"
+	"html/template"
+	"net/http"
+	"os"
+	"strconv"
+
+	"github.com/go-chi/chi/v5"
+	"github.com/go-chi/chi/v5/middleware"
+	"github.com/jackc/pgtype"
+	"github.com/jackc/pgx/v5"
+)
+
+type PageData struct {
+	Content int
+	Artists []string
+	Titles  []string
+	Times   []string
+	Page    int
+}
+
+func Sub(a int, b int) int {
+	return a - b
+}
+
+func Add(a int, b int) int {
+	return a + b
+}
+
+func getTimes(conn *pgx.Conn, lim int, off int) []string {
+	var times []string
+	rows, err := conn.Query(context.Background(), "SELECT timestamp FROM history ORDER BY timestamp DESC LIMIT $1 OFFSET $2;", lim, off)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "SELECT COUNT failed: %v\n", err)
+		return nil
+	}
+	for rows.Next() {
+		var time pgtype.Timestamptz
+		err = rows.Scan(&time)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "Scanning time failed: %v\n", err)
+			return nil
+		}
+		times = append(times, time.Time.String())
+	}
+	return times
+}
+
+func getTitles(conn *pgx.Conn, lim int, off int) []string {
+	var titles []string
+	rows, err := conn.Query(context.Background(), "SELECT song_name FROM history ORDER BY timestamp DESC LIMIT $1 OFFSET $2;", lim, off)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "SELECT COUNT failed: %v\n", err)
+		return nil
+	}
+	for rows.Next() {
+		var title string
+		err = rows.Scan(&title)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "Scanning title failed: %v\n", err)
+			return nil
+		}
+		titles = append(titles, title)
+	}
+	return titles
+}
+
+func getArtists(conn *pgx.Conn, lim int, off int) []string {
+	var artists []string
+	rows, err := conn.Query(context.Background(), "SELECT artist FROM history ORDER BY timestamp DESC LIMIT $1 OFFSET $2;", lim, off)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "SELECT COUNT failed: %v\n", err)
+		return nil
+	}
+	for rows.Next() {
+		var artist string
+		err = rows.Scan(&artist)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "Scanning artist name failed: %v\n", err)
+			return nil
+		}
+		artists = append(artists, artist)
+	}
+	return artists
+}
+
+func getScrobbles(conn *pgx.Conn) int {
+	var count int
+	err := conn.QueryRow(context.Background(), "SELECT COUNT (*) FROM history;").Scan(&count)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "SELECT COUNT failed: %v\n", err)
+		return 0
+	}
+	return count
+}
+
+func tmp(w http.ResponseWriter, r *http.Request) {
+
+	conn, err := pgx.Connect(context.Background(), "postgres://postgres:postgres@localhost:5432/muzi")
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Cannot connect to muzi database: %v\n", err)
+		return
+	}
+	defer conn.Close(context.Background())
+
+	pageStr := r.URL.Query().Get("page")
+	pageInt, err := strconv.Atoi(pageStr)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Cannot convert page URL query from string to int: %v\n", err)
+		return
+	}
+
+	lim := 25
+	off := 0 + (25 * (pageInt - 1))
+
+	data := PageData{
+		Content: getScrobbles(conn),
+		Artists: getArtists(conn, lim, off),
+		Titles:  getTitles(conn, lim, off),
+		Times:   getTimes(conn, lim, off),
+		Page:    pageInt,
+	}
+
+	funcMap := template.FuncMap{
+		"Sub": Sub,
+		"Add": Add,
+	}
+
+	t, err := template.New("history.gohtml").Funcs(funcMap).ParseFiles("./templates/history.gohtml")
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	err = t.Execute(w, data)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+}
+
+func Start() {
+	r := chi.NewRouter()
+	r.Use(middleware.Logger)
+	r.Get("/static/style.css", func(w http.ResponseWriter, r *http.Request) {
+		http.ServeFile(w, r, "./static/style.css")
+	})
+	r.Get("/history", tmp)
+	http.ListenAndServe(":1234", r)
+}