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package backend
import (
"fmt"
"html/template"
"log/slog"
"net/http"
"os"
"path/filepath"
"strconv"
"git.anhgelus.world/anhgelus/small-world/markdown"
"github.com/go-chi/chi/v5"
)
const maxLogsPerPage = 5
var (
sortedLogs []*logData
rootContent = map[string]template.HTML{}
)
type homeData struct {
*data
Logs []*logData
PagesNumber int
CurrentPage int
}
func (h *homeData) SetData(d *data) {
h.data = d
}
func HandleHome(r *chi.Mux) {
r.Get("/", func(w http.ResponseWriter, r *http.Request) {
d := handleGenericLogsDisplay(w, r)
if d == nil {
return
}
d.handleGeneric(w, r, "home", d)
})
}
func Handle404(r *chi.Mux) {
r.NotFound(notFound)
}
func notFound(w http.ResponseWriter, r *http.Request) {
d := new(data)
d.title = "404"
w.WriteHeader(http.StatusNotFound)
d.handleGeneric(w, r, "404", d)
}
type rootData struct {
*data
Content template.HTML
}
func (l *rootData) SetData(d *data) {
l.data = d
}
func HandleRoot(r *chi.Mux, cfg *Config) {
err := os.Mkdir(cfg.RootFolder, 0774)
if err != nil && !os.IsExist(err) {
panic(err)
}
r.Get("/{name:[a-zA-Z-]+}", func(w http.ResponseWriter, r *http.Request) {
handleGenericRoot(w, r, chi.URLParam(r, "name"))
})
}
func handleGenericRoot(w http.ResponseWriter, r *http.Request, name string) {
d := new(rootData)
d.data = new(data)
if c, ok := rootContent[name]; ok {
d.Content = c
} else {
cfg := r.Context().Value(configKey).(*Config)
path := filepath.Join(cfg.RootFolder, name+".md")
b, err := os.ReadFile(path)
if err != nil {
if os.IsNotExist(err) {
notFound(w, r)
return
}
panic(err)
}
var errMd *markdown.ParseError
d.Content, errMd = markdown.ParseBytes(b)
if errMd != nil {
slog.Error("parsing markdown", "path", path)
fmt.Println(errMd.Pretty())
w.WriteHeader(http.StatusInternalServerError)
return
}
rootContent[name] = d.Content
}
d.handleGeneric(w, r, "simple", d)
}
func handleGenericLogsDisplay(w http.ResponseWriter, r *http.Request) *homeData {
rawPage := r.URL.Query().Get("page")
page := 1
if rawPage != "" {
var err error
page, err = strconv.Atoi(rawPage)
if err != nil || page < 1 {
slog.Warn("invalid page number", "rawPage", rawPage)
w.WriteHeader(http.StatusBadRequest)
return nil
}
}
d := new(homeData)
d.data = new(data)
if sortedLogs == nil {
sortLogs()
}
d.CurrentPage = page
d.PagesNumber = len(sortedLogs)/maxLogsPerPage + 1
if d.PagesNumber < page {
notFound(w, r)
return nil
}
d.Logs = sortedLogs[(page-1)*maxLogsPerPage : min(page*maxLogsPerPage, len(sortedLogs))]
return d
}
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