import { ApiError, request } from './client';

/** A private per-user taste signal on a manga. */
export type Reaction = 'like' | 'dislike';

export type MangaReaction = {
    manga_id: string;
    reaction: Reaction | null;
};

/** PUT /v1/mangas/:id/reaction — set (or switch) the user's reaction. */
export async function setReaction(mangaId: string, reaction: Reaction): Promise<MangaReaction> {
    return request<MangaReaction>(`/v1/mangas/${encodeURIComponent(mangaId)}/reaction`, {
        method: 'PUT',
        headers: { 'content-type': 'application/json' },
        body: JSON.stringify({ reaction })
    });
}

/** DELETE /v1/mangas/:id/reaction — clear the user's reaction (idempotent). */
export async function clearReaction(mangaId: string): Promise<void> {
    await request<void>(`/v1/mangas/${encodeURIComponent(mangaId)}/reaction`, {
        method: 'DELETE'
    });
}

/**
 * Returns the user's reaction for a manga, or `null` when they haven't
 * reacted (or aren't signed in). Used by the detail page to seed the
 * like/dislike toggle.
 */
export async function getMyReactionForManga(mangaId: string): Promise<Reaction | null> {
    try {
        const r = await request<MangaReaction>(
            `/v1/me/reactions/${encodeURIComponent(mangaId)}`
        );
        return r.reaction;
    } catch (e) {
        if (e instanceof ApiError && (e.status === 401 || e.status === 404)) return null;
        throw e;
    }
}