extern crate mdbook;
extern crate tempdir;

use std::fs::File;
use std::io::Write;

use mdbook::MDBook;
use tempdir::TempDir;

// Tests that config values unspecified in the configuration file do not overwrite
// values specified earlier.
#[test]
fn do_not_overwrite_unspecified_config_values() {
    let dir = TempDir::new("mdbook").expect("Could not create a temp dir");

    let book = MDBook::new(dir.path()).with_source("bar")
                                      .with_destination("baz")
                                      .with_mathjax_support(true);

    assert_eq!(book.get_root(), dir.path());
    assert_eq!(book.get_source(), dir.path().join("bar"));
    assert_eq!(book.get_destination(), dir.path().join("baz"));

    // Test when trying to read a config file that does not exist
    let book = book.read_config().expect("Error reading the config file");

    assert_eq!(book.get_root(), dir.path());
    assert_eq!(book.get_source(), dir.path().join("bar"));
    assert_eq!(book.get_destination(), dir.path().join("baz"));
    assert_eq!(book.get_mathjax_support(), true);

    // Try with a partial config file
    let file_path = dir.path().join("book.toml");
    let mut f = File::create(file_path).expect("Could not create config file");
    f.write_all(br#"source = "barbaz""#)
     .expect("Could not write to config file");
    f.sync_all().expect("Could not sync the file");

    let book = book.read_config().expect("Error reading the config file");

    assert_eq!(book.get_root(), dir.path());
    assert_eq!(book.get_source(), dir.path().join("barbaz"));
    assert_eq!(book.get_destination(), dir.path().join("baz"));
    assert_eq!(book.get_mathjax_support(), true);
}