//! `include_frontmatter` (SPEC 16): the properties table renders at the top
//! of the page only when the option asks for it, and hostile property counts
//! are capped with an honest overflow line.

mod support;

use notescraft_pdf::{ExportOptions, NoAssets, export};
use support::{options, text};

/// Options with the properties option on.
fn properties() -> ExportOptions {
    let mut opts = options();
    opts.include_frontmatter = true;
    opts
}

/// The rendered text of one export.
fn render(source: &str, opts: &ExportOptions) -> String {
    let pdf = export(source, opts, &NoAssets).unwrap_or_else(|error| panic!("export: {error}"));
    text(&pdf)
}

#[test]
fn nothing_is_drawn_without_frontmatter_or_option() {
    let bare = render("# Just\n\nBody\n", &properties());
    assert_eq!(bare.find("tags"), None, "a note without frontmatter draws no table");

    let defaults = options();
    let hidden = render("---\ntags: blue\n---\n\n# T\n\nBody\n", &defaults);
    assert!(hidden.find("tags").is_none(), "frontmatter is hidden by default");
}

#[test]
fn keys_and_values_render_when_asked_for() {
    let shown = render("---\ncolor: blue\nsize: 10\n---\n# T\nBody", &properties());
    assert!(shown.contains("color"), "the key is drawn: {shown}");
    assert!(shown.contains("blue"), "the value is drawn: {shown}");
    assert!(shown.contains("size"), "the other key is drawn: {shown}");
    assert!(shown.contains("10"), "and its value");
}

/// A hostile note with 1000 properties: two hundred rows render, the rest is
/// reported as one overflow line instead of growing the page list.
#[test]
fn a_hostile_property_count_is_capped() {
    let mut frontmatter = String::from("---\n");
    for index in 0..1000 {
        let _ = std::fmt::Write::write_fmt(&mut frontmatter, format_args!("key{index}: value{index}\n"));
    }
    frontmatter.push_str("---\n# T\nBody\n");
    let shown = render(&frontmatter, &properties());
    assert!(shown.contains("key0"), "the first row renders");
    assert!(shown.contains("key199"), "and the two-hundredth");
    assert_eq!(shown.find("key200"), None, "no row beyond the cap");
    assert!(shown.contains("… 800 more"), "the overflow is reported: {shown}");
}