// Book Picker for Collections - multi-select book picker modal
// CRITICAL: Selection state must persist across HTMX grid updates

import { authHeaders } from "./storage";
import { Alpine } from "./alpine";
import { showToast } from "./toast";

// Alpine.store for global book picker state
// Using store ensures state persists across HTMX DOM swaps
Alpine.store("bookPicker", {
  isOpen: false,
  selectedBooks: new Set<string>(),
  // Picker scope (plan item 2.3): "books" (default) or "episodes" —
  // YOUR subscriptions' episodes. Pure client-local tab state; the
  // selection store is shared, ids never collide.
  scope: "books",

  open() {
    this.isOpen = true;
    this.selectedBooks.clear();
    this.scope = "books";
    this.loadBooks();
  },

  close() {
    this.isOpen = false;
    this.selectedBooks.clear();
  },

  switchScope(scope: "books" | "episodes") {
    this.scope = scope;
    if (scope === "episodes") {
      this.loadEpisodes();
    } else {
      this.loadBooks();
    }
  },

  toggleBook(bookId: string) {
    if (this.selectedBooks.has(bookId)) {
      this.selectedBooks.delete(bookId);
    } else {
      this.selectedBooks.add(bookId);
    }
    // Trigger Alpine reactivity by creating new Set
    this.selectedBooks = new Set(this.selectedBooks);
  },

  isSelected(bookId: string): boolean {
    return this.selectedBooks.has(bookId);
  },

  get selectedCount(): number {
    return this.selectedBooks.size;
  },

  async loadBooks() {
    const grid = document.getElementById("book-picker-grid");
    if (!grid) return;

    // Trigger initial HTMX load
    window.htmx.trigger(grid, "loadBooks");
  },

  async loadEpisodes() {
    const grid = document.getElementById("episode-picker-grid");
    if (!grid) return;
    window.htmx.trigger(grid, "loadEpisodes");
  },

  clearFilters() {
    const filterDiv = document.getElementById("book-picker-filters");
    if (!filterDiv) return;

    const inputs = filterDiv.querySelectorAll('input[type="text"]') as NodeListOf<HTMLInputElement>;
    inputs.forEach((input) => {
      input.value = "";
    });

    this.loadBooks();
  },

  async submit() {

    if (this.selectedBooks.size === 0) {
      showToast("No books selected", "error");
      return;
    }

    // Get collection ID from current page
    const pathParts = window.location.pathname.split("/");
    const collectionId = pathParts[pathParts.length - 1];

    try {
      const response = await fetch(`/api/collections/${collectionId}/books`, {
        method: "POST",
        headers: {
          ...authHeaders(),
          "Content-Type": "application/json",
        },
        body: JSON.stringify({
          book_ids: Array.from(this.selectedBooks),
        }),
      });

      if (response.ok) {
        showToast(`Added ${this.selectedBooks.size} items to collection`, "success");
        this.close();
        location.reload();
      } else {
        showToast("Failed to add items", "error");
      }
    } catch (error) {
      console.error("Failed to add books:", error);
      showToast("Error adding books", "error");
    }
  },
});

// Alpine component for book picker
// Provides methods for template to access store
Alpine.data("bookPicker", () => ({
  get isOpen() {
    return window.Alpine?.$store.bookPicker.isOpen;
  },

  get selectedCount() {
    return window.Alpine?.$store.bookPicker.selectedCount;
  },

  toggleBook(bookId: string) {
    window.Alpine?.$store.bookPicker.toggleBook(bookId);
  },

  isSelected(bookId: string): boolean {
    return window.Alpine?.$store.bookPicker.isSelected(bookId);
  },

  clearFilters() {
    window.Alpine?.$store.bookPicker.clearFilters();
  },

  close() {
    window.Alpine?.$store.bookPicker.close();
  },

  submit() {
    window.Alpine?.$store.bookPicker.submit();
  },
}));