import { createSupabaseServiceRoleClient } from "@/lib/supabase/service-role";

export type PublicGalleryPhotoRow = {
    id: string;
    unsplash_id: string;
    slug: string | null;
    description: string | null;
    alt_description: string | null;
    width: number | null;
    height: number | null;
    color: string | null;
    color_family: string | null;
    likes: number | null;
    urls: Record<string, unknown>;
    user_info: Record<string, unknown>;
    photo_created_at: string | null;
    picked_at: string | null;
    oss_url: string | null;
};

export const publicGalleryPhotoSelect =
    "id,unsplash_id,slug,description,alt_description,width,height,color,color_family,likes,urls,user_info,photo_created_at,picked_at,oss_url";

export function getPublicPhotoUrl(photo: PublicGalleryPhotoRow) {
    const candidates = [
        photo.oss_url,
        photo.urls?.regular,
        photo.urls?.small,
        photo.urls?.raw,
        photo.urls?.thumb,
    ];

    for (const candidate of candidates) {
        if (typeof candidate === "string" && candidate.length > 0) {
            return candidate;
        }
    }

    return null;
}

export async function getFavoritePhotoIds({
    photoIds,
    userId,
}: {
    photoIds: string[];
    userId: string | null;
}) {
    if (!userId || photoIds.length === 0) {
        return new Set<string>();
    }

    const supabase = createSupabaseServiceRoleClient();
    const { data, error } = await supabase
        .from("wg_user_favorites")
        .select("photo_id")
        .eq("user_id", userId)
        .in("photo_id", photoIds);

    if (error) {
        throw error;
    }

    return new Set((data ?? []).map((favorite) => favorite.photo_id));
}

export function mapPublicGalleryPhoto({
    favoritePhotoIds,
    photo,
}: {
    favoritePhotoIds?: Set<string>;
    photo: PublicGalleryPhotoRow;
}) {
    return {
        id: photo.id,
        unsplashId: photo.unsplash_id,
        slug: photo.slug,
        description: photo.description,
        altDescription: photo.alt_description,
        width: photo.width,
        height: photo.height,
        color: photo.color,
        colorFamily: photo.color_family,
        likes: photo.likes,
        url: getPublicPhotoUrl(photo),
        sourceUrl: getPublicPhotoUrl({ ...photo, oss_url: null }),
        user: photo.user_info,
        photoCreatedAt: photo.photo_created_at,
        pickedAt: photo.picked_at,
        isFavorited: favoritePhotoIds?.has(photo.id) ?? false,
    };
}

export async function listPickedGalleryPhotos({
    colorFamily,
    page,
    pageSize,
    userId,
}: {
    colorFamily: string | null;
    page: number;
    pageSize: number;
    userId: string | null;
}) {
    const supabase = createSupabaseServiceRoleClient();
    let query = supabase
        .from("wg_gallery_photos")
        .select(publicGalleryPhotoSelect, { count: "exact" })
        .eq("is_picked", true);

    if (colorFamily && colorFamily !== "all") {
        query = query.eq("color_family", colorFamily);
    }

    const { data, error, count } = await query
        .order("picked_at", { ascending: false, nullsFirst: false })
        .order("photo_created_at", { ascending: false })
        .range((page - 1) * pageSize, page * pageSize - 1);

    if (error) {
        throw error;
    }

    const photos = (data ?? []) as PublicGalleryPhotoRow[];
    const favoritePhotoIds = await getFavoritePhotoIds({
        userId,
        photoIds: photos.map((photo) => photo.id),
    });

    return {
        data: photos.map((photo) =>
            mapPublicGalleryPhoto({ photo, favoritePhotoIds }),
        ),
        total: count ?? 0,
    };
}

export async function getPickedGalleryPhotoById({
    id,
    userId,
}: {
    id: string;
    userId: string | null;
}) {
    const supabase = createSupabaseServiceRoleClient();
    const { data, error } = await supabase
        .from("wg_gallery_photos")
        .select(publicGalleryPhotoSelect)
        .eq("id", id)
        .eq("is_picked", true)
        .maybeSingle<PublicGalleryPhotoRow>();

    if (error) {
        throw error;
    }

    if (!data) {
        return null;
    }

    const favoritePhotoIds = await getFavoritePhotoIds({
        userId,
        photoIds: [data.id],
    });

    return mapPublicGalleryPhoto({ photo: data, favoritePhotoIds });
}