use serde::{Deserialize, Serialize};

pub const DEFAULT_PAGE: u64 = 0;
pub const DEFAULT_PER_PAGE: u64 = 25;

#[derive(Deserialize)]
pub struct Query {
    pub page: Option<u64>,
    pub per_page: Option<u64>,
}

#[derive(Serialize)]
pub struct PaginatedResponse<T>
where
    T: for<'de> Serialize,
{
    pub page: u64,
    pub per_page: u64,
    pub total_pages: u64,
    pub count: usize,
    pub items: Vec<T>,
}

impl Query {
    pub fn res<T: for<'de> Serialize>(
        self,
        total_pages: u64,
        items: Vec<T>,
    ) -> PaginatedResponse<T> {
        PaginatedResponse {
            page: self.page.unwrap_or(DEFAULT_PAGE),
            per_page: self.per_page.unwrap_or(DEFAULT_PER_PAGE),
            total_pages,
            count: items.len(),
            items,
        }
    }
}