extern crate mdbook;
#[macro_use]
extern crate pretty_assertions;
extern crate select;
extern crate walkdir;

mod dummy_book;

use dummy_book::{assert_contains_strings, DummyBook};

use std::path::Path;
use std::ffi::OsStr;
use walkdir::{DirEntry, WalkDir, WalkDirIterator};
use select::document::Document;
use select::predicate::{Class, Name, Predicate};
use mdbook::errors::*;
use mdbook::utils::fs::file_to_string;
use mdbook::MDBook;


const BOOK_ROOT: &'static str = concat!(env!("CARGO_MANIFEST_DIR"), "/tests/dummy_book");
const TOC_TOP_LEVEL: &[&'static str] = &["1. First Chapter",
                                         "2. Second Chapter",
                                         "Conclusion",
                                         "Introduction"];
const TOC_SECOND_LEVEL: &[&'static str] = &["1.1. Nested Chapter"];

/// Make sure you can load the dummy book and build it without panicking.
#[test]
fn build_the_dummy_book() {
    let temp = DummyBook::new().build().unwrap();
    let mut md = MDBook::new(temp.path());

    md.build().unwrap();
}

#[test]
fn by_default_mdbook_generates_rendered_content_in_the_book_directory() {
    let temp = DummyBook::new().build().unwrap();
    let mut md = MDBook::new(temp.path());

    assert!(!temp.path().join("book").exists());
    md.build().unwrap();

    assert!(temp.path().join("book").exists());
    assert!(temp.path().join("book").join("index.html").exists());
}

#[test]
fn make_sure_bottom_level_files_contain_links_to_chapters() {
    let temp = DummyBook::new().build().unwrap();
    let mut md = MDBook::new(temp.path());
    md.build().unwrap();

    let dest = temp.path().join("book");
    let links = vec![r#"href="intro.html""#,
                     r#"href="./first/index.html""#,
                     r#"href="./first/nested.html""#,
                     r#"href="./second.html""#,
                     r#"href="./conclusion.html""#];

    let files_in_bottom_dir = vec!["index.html", "intro.html", "second.html", "conclusion.html"];

    for filename in files_in_bottom_dir {
        assert_contains_strings(dest.join(filename), &links);
    }
}

#[test]
fn check_correct_cross_links_in_nested_dir() {
    let temp = DummyBook::new().build().unwrap();
    let mut md = MDBook::new(temp.path());
    md.build().unwrap();

    let first = temp.path().join("book").join("first");
    let links = vec![r#"<base href="../">"#,
                     r#"href="intro.html""#,
                     r#"href="./first/index.html""#,
                     r#"href="./first/nested.html""#,
                     r#"href="./second.html""#,
                     r#"href="./conclusion.html""#];

    let files_in_nested_dir = vec!["index.html", "nested.html"];

    for filename in files_in_nested_dir {
        assert_contains_strings(first.join(filename), &links);
    }

    assert_contains_strings(first.join("index.html"),
                            &[r##"href="./first/index.html#some-section" id="some-section""##]);

    assert_contains_strings(first.join("nested.html"),
                            &[r##"href="./first/nested.html#some-section" id="some-section""##]);
}

#[test]
fn rendered_code_has_playpen_stuff() {
    let temp = DummyBook::new().build().unwrap();
    let mut md = MDBook::new(temp.path());
    md.build().unwrap();

    let nested = temp.path().join("book/first/nested.html");
    let playpen_class = vec![r#"class="playpen""#];

    assert_contains_strings(nested, &playpen_class);

    let book_js = temp.path().join("book/book.js");
    assert_contains_strings(book_js, &[".playpen"]);
}

#[test]
fn chapter_content_appears_in_rendered_document() {
    let content = vec![("index.html", "Here's some interesting text"),
                       ("second.html", "Second Chapter"),
                       ("first/nested.html", "testable code"),
                       ("first/index.html", "more text"),
                       ("conclusion.html", "Conclusion")];

    let temp = DummyBook::new().build().unwrap();
    let mut md = MDBook::new(temp.path());
    md.build().unwrap();

    let destination = temp.path().join("book");

    for (filename, text) in content {
        let path = destination.join(filename);
        assert_contains_strings(path, &[text]);
    }
}


/// Apply a series of predicates to some root predicate, where each
/// successive predicate is the descendant of the last one. Similar to how you
/// might do `ul.foo li a` in CSS to access all anchor tags in the `foo` list.
macro_rules! descendants {
    ($root:expr, $($child:expr),*) => {
        $root
        $(
            .descendant($child)
        )*
    };
}


/// Make sure that all `*.md` files (excluding `SUMMARY.md`) were rendered
/// and placed in the `book` directory with their extensions set to `*.html`.
#[test]
fn chapter_files_were_rendered_to_html() {
    let temp = DummyBook::new().build().unwrap();
    let src = Path::new(BOOK_ROOT).join("src");

    let chapter_files = WalkDir::new(&src).into_iter()
                                          .filter_entry(|entry| entry_ends_with(entry, ".md"))
                                          .filter_map(|entry| entry.ok())
                                          .map(|entry| entry.path().to_path_buf())
                                          .filter(|path| {
                                                      path.file_name().and_then(OsStr::to_str)
                                                          != Some("SUMMARY.md")
                                                  });

    for chapter in chapter_files {
        let rendered_location = temp.path().join(chapter.strip_prefix(&src).unwrap())
                                    .with_extension("html");
        assert!(rendered_location.exists(),
                "{} doesn't exits",
                rendered_location.display());
    }
}

fn entry_ends_with(entry: &DirEntry, ending: &str) -> bool {
    entry.file_name().to_string_lossy().ends_with(ending)
}

/// Read the main page (`book/index.html`) and expose it as a DOM which we
/// can search with the `select` crate
fn root_index_html() -> Result<Document> {
    let temp = DummyBook::new().build()
                               .chain_err(|| "Couldn't create the dummy book")?;
    MDBook::new(temp.path()).build()
                            .chain_err(|| "Book building failed")?;

    let index_page = temp.path().join("book").join("index.html");
    let html = file_to_string(&index_page).chain_err(|| "Unable to read index.html")?;

    Ok(Document::from(html.as_str()))
}

#[test]
fn check_second_toc_level() {
    let doc = root_index_html().unwrap();
    let mut should_be = Vec::from(TOC_SECOND_LEVEL);
    should_be.sort();

    let pred = descendants!(Class("chapter"), Name("li"), Name("li"), Name("a"));

    let mut children_of_children: Vec<_> =
        doc.find(pred).map(|elem| elem.text().trim().to_string())
           .collect();
    children_of_children.sort();

    assert_eq!(children_of_children, should_be);
}

#[test]
fn check_first_toc_level() {
    let doc = root_index_html().unwrap();
    let mut should_be = Vec::from(TOC_TOP_LEVEL);

    should_be.extend(TOC_SECOND_LEVEL);
    should_be.sort();

    let pred = descendants!(Class("chapter"), Name("li"), Name("a"));

    let mut children: Vec<_> = doc.find(pred).map(|elem| elem.text().trim().to_string())
                                       .collect();
    children.sort();

    assert_eq!(children, should_be);
}

#[test]
fn check_spacers() {
    let doc = root_index_html().unwrap();
    let should_be = 1;

    let num_spacers =
        doc.find(Class("chapter").descendant(Name("li").and(Class("spacer")))).count();
    assert_eq!(num_spacers, should_be);
}