import { apiPut, ReadingProgress } from "../../api";

interface ExtendedProgress {
  character?: number;
  chapter?: number;
  percentage?: number;
}

export async function updateReadingProgress(
  mediaItemId: string,
  progress: ReadingProgress,
  extended?: ExtendedProgress,
): Promise<void> {
  if (!mediaItemId || mediaItemId === "undefined") {
    console.warn("Skipping progress update - no valid mediaItemId");
    return;
  }

  const payload: ReadingProgress = {
    current_page: progress.current_page,
    total_pages: progress.total_pages,
    cfi: progress.cfi || "",
    percentage: extended?.percentage || 0,
    last_read_at: new Date().toISOString(),
  };
  const response = await apiPut(
    `/media-items/${mediaItemId}/progress`,
    payload,
  );
  if (!response.ok) {
    const clonedResponse = response.clone();
    const errorText = await clonedResponse.text();
    console.warn("Progress update failed:", clonedResponse.status, errorText);
    return;
  }
}

export function getChapterNavigation(chapters: Chapter[]) {
  return {
    getNextChapter: (currentPage: number) => {
      for (let i = 0; i < chapters.length - 1; i++) {
        const chapter = chapters[i];
        const nextChapter = chapters[i + 1];

        if (
          currentPage >= chapter.start_page &&
          currentPage < nextChapter.start_page
        ) {
          return nextChapter.start_page;
        }
      }
      return null;
    },

    getPreviousChapter: (currentPage: number) => {
      for (let i = 1; i < chapters.length; i++) {
        const chapter = chapters[i];

        if (
          currentPage >= chapter.start_page &&
          currentPage < chapter.start_page + chapter.page_count
        ) {
          return chapters[i - 1].start_page;
        }
      }

      if (currentPage < chapters[0].start_page) {
        return null;
      }

      return chapters[0].start_page;
    },
  };
}