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use vantage_expressions::traits::selectable::Selectable;
/// Pagination configuration for tables
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct Pagination {
page: i64,
items_per_page: i64,
}
impl Pagination {
/// Create new pagination with page number and items per page
pub fn new(page: i64, items_per_page: i64) -> Self {
Self {
page: page.max(1),
items_per_page: items_per_page.max(1),
}
}
/// Set the current page number (1-based)
pub fn set_page(&mut self, page: i64) {
self.page = page.max(1);
}
/// Set items per page
/// When changing page size, adjusts current page to keep focused item visible
pub fn set_ipp(&mut self, items_per_page: i64) {
let items_per_page = items_per_page.max(1);
// Calculate which item is currently at the top of the page
let first_item_index = (self.page - 1) * self.items_per_page;
// Calculate which page that item would be on with the new page size
self.page = (first_item_index / items_per_page) + 1;
self.items_per_page = items_per_page;
}
/// Get the current page number (1-based)
pub fn get_page(&self) -> i64 {
self.page
}
/// Get items per page
pub fn get_ipp(&self) -> i64 {
self.items_per_page
}
/// Calculate limit value for queries
pub fn limit(&self) -> i64 {
self.items_per_page
}
/// Calculate skip/offset value for queries
pub fn skip(&self) -> i64 {
(self.page - 1) * self.items_per_page
}
/// Apply pagination to a select query
pub fn apply_on_select<S, E>(&self, select: &mut S)
where
S: Selectable<E>,
{
select.set_limit(Some(self.limit()), Some(self.skip()));
}
}
impl Default for Pagination {
fn default() -> Self {
Self {
page: 1,
items_per_page: 50,
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_new_pagination() {
let p = Pagination::new(2, 25);
assert_eq!(p.get_page(), 2);
assert_eq!(p.get_ipp(), 25);
assert_eq!(p.limit(), 25);
assert_eq!(p.skip(), 25);
}
#[test]
fn test_pagination_bounds() {
let p = Pagination::new(0, 0);
assert_eq!(p.get_page(), 1);
assert_eq!(p.get_ipp(), 1);
}
#[test]
fn test_set_page() {
let mut p = Pagination::new(1, 10);
p.set_page(3);
assert_eq!(p.get_page(), 3);
assert_eq!(p.skip(), 20);
}
#[test]
fn test_set_ipp_keeps_focus() {
let mut p = Pagination::new(3, 10);
// Page 3 with 10 items means items 20-29 are visible
// First item is at index 20
p.set_ipp(5);
// With 5 items per page, item 20 should be on page 5 (items 20-24)
assert_eq!(p.get_page(), 5);
assert_eq!(p.get_ipp(), 5);
assert_eq!(p.skip(), 20);
}
#[test]
fn test_set_ipp_larger_page_size() {
let mut p = Pagination::new(5, 5);
// Page 5 with 5 items means items 20-24 are visible
p.set_ipp(25);
// With 25 items per page, item 20 should be on page 1 (items 0-24)
assert_eq!(p.get_page(), 1);
assert_eq!(p.get_ipp(), 25);
assert_eq!(p.skip(), 0);
}
#[test]
fn test_default_pagination() {
let p = Pagination::default();
assert_eq!(p.get_page(), 1);
assert_eq!(p.get_ipp(), 50);
assert_eq!(p.skip(), 0);
}
// #[test]
// fn test_with_table() {
// use crate::{Table, TableLike, any::AnyTable, mocks::MockTableSource};
// let ds = MockTableSource::new();
// let table = Table::new("users", ds);
// let mut any_table = AnyTable::new(table);
// // Set pagination using callback
// // Note: set_ipp before set_page to avoid page recalculation
// any_table.with_pagination(|p| {
// p.set_ipp(25);
// p.set_page(3);
// });
// let pagination = any_table.get_pagination().unwrap();
// assert_eq!(pagination.get_page(), 3);
// assert_eq!(pagination.get_ipp(), 25);
// assert_eq!(pagination.skip(), 50);
// assert_eq!(pagination.limit(), 25);
// }
// #[test]
// fn test_table_pagination_direct_set() {
// use crate::{Table, TableLike, mocks::MockTableSource};
// let ds = MockTableSource::new();
// let mut table = Table::new("products", ds);
// // Set pagination directly via TableLike trait
// table.set_pagination(Some(Pagination::new(2, 10)));
// let pagination = table.get_pagination().unwrap();
// assert_eq!(pagination.get_page(), 2);
// assert_eq!(pagination.get_ipp(), 10);
// // Remove pagination
// table.set_pagination(None);
// assert!(table.get_pagination().is_none());
// }
}