refactor: simplify main.go and introduce central router with modular handlers

internal/handlers/anime.go

@@ -0,0 +1,137 @@
+package handlers
+
+import (
+	"log"
+	"net/http"
+	"strconv"
+
+	"malago/internal/database"
+	"malago/internal/jikan"
+	"malago/internal/middleware"
+	"malago/internal/templates"
+)
+
+type AnimeHandler struct {
+	jikan *jikan.Client
+	db    *database.Queries
+}
+
+func NewAnimeHandler(jikan *jikan.Client, db *database.Queries) *AnimeHandler {
+	return &AnimeHandler{jikan: jikan, db: db}
+}
+
+func (h *AnimeHandler) HandleCatalog(w http.ResponseWriter, r *http.Request) {
+	if r.URL.Path != "/" {
+		http.NotFound(w, r)
+		return
+	}
+	templates.Catalog().Render(r.Context(), w)
+}
+
+func (h *AnimeHandler) HandleSearch(w http.ResponseWriter, r *http.Request) {
+	query := r.URL.Query().Get("q")
+	if query == "" {
+		templates.Search("").Render(r.Context(), w)
+		return
+	}
+
+	// Check if HTMX request for results only
+	if r.Header.Get("HX-Request") == "true" {
+		res, err := h.jikan.Search(query, 1)
+		if err != nil {
+			log.Printf("search error: %v", err)
+			http.Error(w, "Failed to search anime", http.StatusInternalServerError)
+			return
+		}
+		templates.SearchResultsWrapper(query, res.Animes, 2, res.HasNextPage).Render(r.Context(), w)
+		return
+	}
+
+	// Full page with query
+	templates.Search(query).Render(r.Context(), w)
+}
+
+func (h *AnimeHandler) HandleAPISearch(w http.ResponseWriter, r *http.Request) {
+	query := r.URL.Query().Get("q")
+	pageStr := r.URL.Query().Get("page")
+	page, _ := strconv.Atoi(pageStr)
+	if page < 1 {
+		page = 1
+	}
+
+	res, err := h.jikan.Search(query, page)
+	if err != nil {
+		log.Printf("search pagination error: %v", err)
+		http.Error(w, "Failed to fetch search page", http.StatusInternalServerError)
+		return
+	}
+
+	templates.SearchItems(query, res.Animes, page+1, res.HasNextPage).Render(r.Context(), w)
+}
+
+func (h *AnimeHandler) HandleAPICatalog(w http.ResponseWriter, r *http.Request) {
+	pageStr := r.URL.Query().Get("page")
+	page, _ := strconv.Atoi(pageStr)
+	if page < 1 {
+		page = 1
+	}
+
+	res, err := h.jikan.GetTopAnime(page)
+	if err != nil {
+		log.Printf("top anime error: %v", err)
+		http.Error(w, "Failed to fetch top anime", http.StatusInternalServerError)
+		return
+	}
+
+	templates.CatalogItems(res.Animes, page+1, res.HasNextPage).Render(r.Context(), w)
+}
+
+func (h *AnimeHandler) HandleAnimeDetails(w http.ResponseWriter, r *http.Request) {
+	idStr := r.URL.Path[len("/anime/"):]
+	id, err := strconv.Atoi(idStr)
+	if err != nil || id <= 0 {
+		http.NotFound(w, r)
+		return
+	}
+
+	anime, err := h.jikan.GetAnimeByID(id)
+	if err != nil {
+		log.Printf("anime fetch error for %d: %v", id, err)
+		http.Error(w, "Failed to fetch anime details", http.StatusInternalServerError)
+		return
+	}
+
+	// Get current watchlist status if user is logged in
+	currentStatus := ""
+	if user := middleware.GetUser(r.Context()); user != nil {
+		entry, err := h.db.GetWatchListEntry(r.Context(), database.GetWatchListEntryParams{
+			UserID:  user.ID,
+			AnimeID: int64(id),
+		})
+		if err == nil {
+			currentStatus = entry.Status
+		}
+	}
+
+	templates.AnimeDetails(anime, currentStatus).Render(r.Context(), w)
+}
+
+func (h *AnimeHandler) HandleAPIAnimeRelations(w http.ResponseWriter, r *http.Request) {
+	path := r.URL.Path[len("/api/anime/"):]
+	idStr := ""
+	for i, c := range path {
+		if c == '/' {
+			idStr = path[:i]
+			break
+		}
+	}
+
+	id, _ := strconv.Atoi(idStr)
+	if id <= 0 {
+		http.Error(w, "invalid id", http.StatusBadRequest)
+		return
+	}
+
+	relations := h.jikan.GetFullRelations(id)
+	templates.AnimeRelationsList(relations).Render(r.Context(), w)
+}