//! The demo document must be one a visitor can *type into* (improvise-bck),
//! asked as the browser asks it. `context/test-evidence/tui.md`.

use improvise::protocol::CellId;
use improvise_command::ui::app::App;
use improvise_command::ui::project::{Viewport, grid_of};

fn demo_app() -> App {
    let path = std::path::Path::new(env!("CARGO_MANIFEST_DIR")).join("web/demo.improv");
    let workbook = improvise::persistence::load(&path).expect("web/demo.improv loads");
    App::new(workbook, Some(path))
}

/// Every cell the page paints is either one the visitor may change or one a
/// formula owns — never an aggregate. `context/test-evidence/tui.md`.
#[test]
fn every_web_demo_cell_is_settable_except_the_column_a_formula_owns() {
    let app = demo_app();
    let (rows, cols) = (app.layout.row_count(), app.layout.col_count());
    assert!(rows > 0 && cols > 0, "the demo grid must not be empty");

    let grid = grid_of(
        &app,
        Viewport {
            row_offset: 0,
            col_offset: 0,
            rows,
            cols,
        },
    );

    for r in 0..rows {
        for c in 0..cols {
            let cell = grid.cell(r, c).expect("a projected cell at every position");
            let expected_derived = grid
                .col_frame
                .item(c)
                .is_some_and(|t| t.as_slice() == ["Profit"]);
            let ok = match (&cell.id, expected_derived) {
                (Some(CellId::Record(_)), false) => true,
                (Some(CellId::Derived { target }), true) => target == "Profit",
                _ => false,
            };
            assert!(
                ok,
                "cell ({r},{c}) — row {:?}, column {:?} — is {:?}; the two raw columns must be \
                 Records the page offers, and Profit must be Derived so it does not",
                grid.row_frame.item(r),
                grid.col_frame.item(c),
                cell.id,
            );
        }
    }
}

/// The payoff a visitor should see without pressing a key: a formula column
/// beside the two columns that feed it, so an edit visibly moves it.
#[test]
fn the_web_demo_shows_a_formula_beside_its_inputs() {
    let app = demo_app();
    let grid = grid_of(
        &app,
        Viewport {
            row_offset: 0,
            col_offset: 0,
            rows: app.layout.row_count(),
            cols: app.layout.col_count(),
        },
    );
    assert_eq!(
        grid.col_frame.leaf_labels(),
        vec!["Revenue", "Cost", "Profit"]
    );
    assert_eq!(
        grid.row_frame.leaf_labels(),
        vec!["Espresso", "Latte", "Cold Brew", "Pastry"]
    );
    let profit = grid.cell(0, 2).expect("the Profit cell");
    assert_eq!(
        profit.text, "12,200.00",
        "18,400 - 6,200, recomputed on load, under the decimal default"
    );
}