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import { Layout, type PageFragment } from '$gql/graphql';
import { getContext, setContext } from 'svelte';
import { writable, type Writable } from 'svelte/store';
export interface Chunk {
main: PageFragment;
secondary?: PageFragment;
index: number;
}
class ReaderContext {
visible = false;
sidebar = false;
pages: PageFragment[] = [];
page = 0;
open(page: number) {
this.page = page;
this.visible = true;
return this;
}
}
export function initReaderContext() {
return setContext<Writable<ReaderContext>>('reader', writable(new ReaderContext()));
}
export function getReaderContext() {
return getContext<Writable<ReaderContext>>('reader');
}
export function partition(pages: PageFragment[], layout: Layout): [Chunk[], number[]] {
const single = layout === Layout.Single;
const offset = layout === Layout.DoubleOffset;
const chunks: Chunk[] = [];
const lookup: number[] = Array<number>(pages.length);
for (let chunkIndex = 0, pageIndex = 0; pageIndex < pages.length; chunkIndex++) {
const wide = () => pages[pageIndex].image.aspectRatio > 1;
const nextPage = () => {
lookup[pageIndex] = chunkIndex;
return pages[pageIndex++];
};
const offsetFirst = pageIndex === 0 && offset;
const full = single || wide() || offsetFirst;
const chunk: Chunk = { index: pageIndex, main: nextPage() };
if (!full && pageIndex < pages.length) {
if (!wide()) {
chunk.secondary = nextPage();
}
}
chunks.push(chunk);
}
return [chunks, lookup];
}
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