// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

//! Implementation of the `build` subcommand, used to compile a book.

use std::os;
use std::old_io;
use std::old_io::{fs, File, BufferedWriter, TempDir, IoResult};

use subcommand::Subcommand;
use term::Term;
use error::{Error, CliResult, CommandResult};
use book;
use book::{Book, BookItem};
use css;
use javascript;

use rustdoc;

struct Build;

pub fn parse_cmd(name: &str) -> Option<Box<Subcommand>> {
    if name == "build" {
        Some(box Build as Box<Subcommand>)
    } else {
        None
    }
}

fn write_toc(book: &Book, path_to_root: &Path, out: &mut Writer) -> IoResult<()> {
    fn walk_items(items: &[BookItem],
                  section: &str,
                  path_to_root: &Path,
                  out: &mut Writer) -> IoResult<()> {
        for (i, item) in items.iter().enumerate() {
            try!(walk_item(item, &format!("{}{}.", section, i + 1)[], path_to_root, out));
        }
        Ok(())
    }
    fn walk_item(item: &BookItem,
                 section: &str,
                 path_to_root: &Path,
                 out: &mut Writer) -> IoResult<()> {
        try!(writeln!(out, "<li><a href='{}'><b>{}</b> {}</a>",
                 path_to_root.join(item.path.with_extension("html")).display(),
                 section,
                 item.title));
        if !item.children.is_empty() {
            try!(writeln!(out, "<ul class='section'>"));
            let _ = walk_items(&item.children[], section, path_to_root, out);
            try!(writeln!(out, "</ul>"));
        }
        try!(writeln!(out, "</li>"));

        Ok(())
    }

    try!(writeln!(out, "<div id='toc' class='mobile-hidden'>"));
    try!(writeln!(out, "<ul class='chapter'>"));
    try!(walk_items(&book.chapters[], "", path_to_root, out));
    try!(writeln!(out, "</ul>"));
    try!(writeln!(out, "</div>"));

    Ok(())
}

fn render(book: &Book, tgt: &Path) -> CliResult<()> {
    let tmp = try!(TempDir::new("rust-book"));

    for (section, item) in book.iter() {
        println!("{} {}", section, item.title);

        let out_path = tgt.join(item.path.dirname());

        let src;
        if os::args().len() < 3 {
            src = os::getcwd().unwrap().clone();
        } else {
            src = Path::new(os::args()[2].clone());
        }
        // preprocess the markdown, rerouting markdown references to html references
        let markdown_data = try!(File::open(&src.join(&item.path)).read_to_string());
        let preprocessed_path = tmp.path().join(item.path.filename().unwrap());
        {
            let urls = markdown_data.replace(".md)", ".html)");
            try!(File::create(&preprocessed_path)
                      .write_str(&urls[]));
        }

        // write the prelude to a temporary HTML file for rustdoc inclusion
        let prelude = tmp.path().join("prelude.html");
        {
            let mut toc = BufferedWriter::new(try!(File::create(&prelude)));
            try!(writeln!(&mut toc, r#"<div id="nav">
                <button id="toggle-nav">
                  <span class="sr-only">Toggle navigation</span>
                  <span class="bar"></span>
                  <span class="bar"></span>
                  <span class="bar"></span>
                </button>
              </div>"#));
            let _ = write_toc(book, &item.path_to_root, &mut toc);
            try!(writeln!(&mut toc, "<div id='page-wrapper'>"));
            try!(writeln!(&mut toc, "<div id='page'>"));
        }

        // write the postlude to a temporary HTML file for rustdoc inclusion
        let postlude = tmp.path().join("postlude.html");
        {
            let mut toc = BufferedWriter::new(try!(File::create(&postlude)));
            try!(toc.write_str(javascript::JAVASCRIPT));
            try!(writeln!(&mut toc, "</div></div>"));
        }

        try!(fs::mkdir_recursive(&out_path, old_io::USER_DIR));

        let rustdoc_args: &[String] = &[
            "".to_string(),
            preprocessed_path.display().to_string(),
            format!("-o{}", out_path.display()),
            format!("--html-before-content={}", prelude.display()),
            format!("--html-after-content={}", postlude.display()),
            format!("--markdown-css={}", item.path_to_root.join("rust-book.css").display()),
            "--markdown-no-toc".to_string(),
        ];
        let output_result = rustdoc::main_args(rustdoc_args);
        if output_result != 0 {
            let message = format!("Could not execute `rustdoc` with {:?}: {}",
                                  rustdoc_args, output_result);
            return Err(box message as Box<Error>);
        }
    }

    // create index.html from the root README
    try!(fs::copy(&tgt.join("README.html"), &tgt.join("index.html")));
    Ok(())
}

impl Subcommand for Build {
    fn parse_args(&mut self, _: &[String]) -> CliResult<()> {
        Ok(())
    }
    fn usage(&self) {}
    fn execute(&mut self, term: &mut Term) -> CommandResult<()> {
        let cwd = os::getcwd().unwrap();
        let src;
        let tgt;

        if os::args().len() < 3 {
            src = cwd.clone();
        } else {
            src = Path::new(os::args()[2].clone());
        }

        if os::args().len() < 4 {
            tgt = cwd.join("_book");
        } else {
            tgt = Path::new(os::args()[3].clone());
        }

        try!(fs::mkdir(&tgt, old_io::USER_DIR));

        try!(File::create(&tgt.join("rust-book.css")).write_str(css::STYLE));

        let summary = try!(File::open(&src.join("SUMMARY.md")));
        match book::parse_summary(summary, &src) {
            Ok(book) => {
                // execute rustdoc on the whole book
                render(&book, &tgt)
            }
            Err(errors) => {
                let n = errors.len();
                for err in errors {
                    term.err(&format!("error: {}", err)[]);
                }

                Err(box format!("{} errors occurred", n) as Box<Error>)
            }
        }
    }
}
