use std::path::Path;

use criterion::{black_box, criterion_group, criterion_main, Criterion};

use typst::eval::eval;
use typst::layout::layout;
use typst::loading::MemLoader;
use typst::parse::{parse, Scanner, TokenMode, Tokens};
use typst::source::SourceId;
use typst::Context;

const SRC: &str = include_str!("bench.typ");
const FONT: &[u8] = include_bytes!("../fonts/IBMPlexSans-Regular.ttf");

fn context() -> (Context, SourceId) {
    let loader = MemLoader::new().with(Path::new("font.ttf"), FONT).wrap();
    let mut ctx = Context::new(loader);
    let id = ctx.sources.provide(Path::new("src.typ"), SRC.to_string());
    (ctx, id)
}

fn bench_decode(c: &mut Criterion) {
    c.bench_function("decode", |b| {
        b.iter(|| {
            // We don't use chars().count() because that has a special
            // superfast implementation.
            let mut count = 0;
            let mut chars = black_box(SRC).chars();
            while let Some(_) = chars.next() {
                count += 1;
            }
            count
        })
    });
}

fn bench_scan(c: &mut Criterion) {
    c.bench_function("scan", |b| {
        b.iter(|| {
            let mut count = 0;
            let mut scanner = Scanner::new(black_box(SRC));
            while let Some(_) = scanner.eat() {
                count += 1;
            }
            count
        })
    });
}

fn bench_tokenize(c: &mut Criterion) {
    c.bench_function("tokenize", |b| {
        b.iter(|| Tokens::new(black_box(SRC), black_box(TokenMode::Markup)).count())
    });
}

fn bench_parse(c: &mut Criterion) {
    c.bench_function("parse", |b| b.iter(|| parse(SRC)));
}

fn bench_edit(c: &mut Criterion) {
    let (mut ctx, id) = context();
    c.bench_function("edit", |b| {
        b.iter(|| black_box(ctx.sources.edit(id, 1168 .. 1171, "_Uhr_")))
    });
}

fn bench_eval(c: &mut Criterion) {
    let (mut ctx, id) = context();
    let ast = ctx.sources.get(id).ast().unwrap();
    c.bench_function("eval", |b| b.iter(|| eval(&mut ctx, id, &ast).unwrap()));
}

fn bench_to_tree(c: &mut Criterion) {
    let (mut ctx, id) = context();
    let module = ctx.evaluate(id).unwrap();
    c.bench_function("to_tree", |b| {
        b.iter(|| module.template.to_pages(ctx.style()))
    });
}

fn bench_layout(c: &mut Criterion) {
    let (mut ctx, id) = context();
    let tree = ctx.execute(id).unwrap();
    c.bench_function("layout", |b| b.iter(|| layout(&mut ctx, &tree)));
}

criterion_group!(
    benches,
    bench_decode,
    bench_scan,
    bench_tokenize,
    bench_parse,
    bench_edit,
    bench_eval,
    bench_to_tree,
    bench_layout
);
criterion_main!(benches);