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use std::path;
use std::fs;
use std::io::Write;

use liquid;

use error::*;
use config::Config;
use datetime;
use files;
use legacy::wildwest;
use slug;

const COBALT_YML: &'static str = "name: cobalt blog
source: \".\"
dest: \"./_site\"
";

const DEFAULT_LAYOUT: &'static str = "<!DOCTYPE html>
<html>
    <head>
        <meta charset=\"utf-8\">
        {% if is_post %}
          <title>{{ title }}</title>
        {% else %}
          <title>Cobalt.rs Blog</title>
        {% endif %}
    </head>
    <body>
    <div>
      {% if is_post %}
        {% include '_layouts/post.liquid' %}
      {% else %}
        {{ content }}
      {% endif %}
    </div>
  </body>
</html>
";

const POST_LAYOUT: &'static str = "<div>
  <h2>{{ title }}</h2>
  <p>
    {{content}}
  </p>
</div>
";

const POST_MD: &'static str = "extends: default.liquid

title: First Post
draft: true
---

# This is our first Post!

Welcome to the first post ever on cobalt.rs!
";

const INDEX_MD: &'static str = "extends: default.liquid
---
## Blog!

{% for post in posts %}
#### {{post.title}}

#### [{{ post.title }}]({{ post.path }})
{% endfor %}
";

pub fn create_new_project<P: AsRef<path::Path>>(dest: P) -> Result<()> {
    create_new_project_for_path(dest.as_ref())
}

pub fn create_new_project_for_path(dest: &path::Path) -> Result<()> {
    fs::create_dir_all(dest)?;

    create_file(&dest.join(".cobalt.yml"), COBALT_YML)?;
    create_file(&dest.join("index.md"), INDEX_MD)?;

    fs::create_dir_all(&dest.join("_layouts"))?;
    create_file(&dest.join("_layouts/default.liquid"), DEFAULT_LAYOUT)?;
    create_file(&dest.join("_layouts/post.liquid"), POST_LAYOUT)?;

    fs::create_dir_all(&dest.join("posts"))?;
    create_file(&dest.join("posts/post-1.md"), POST_MD)?;

    Ok(())
}

pub fn create_new_document(config: &Config, title: &str, file: path::PathBuf) -> Result<()> {
    let file = if file.extension().is_none() {
        let file_name = format!("{}.md", slug::slugify(title));
        let mut file = file;
        file.push(path::Path::new(&file_name));
        file
    } else {
        file
    };

    let rel_file = file.strip_prefix(&config.source)
        .map_err(|_| {
                     format!("New file {:?} not project directory ({:?})",
                             file,
                             config.source)
                 })?;

    let (file_type, doc) = if rel_file.starts_with(path::Path::new(&config.posts.dir)) ||
                              config
                                  .posts
                                  .drafts_dir
                                  .as_ref()
                                  .map(|dir| rel_file.starts_with(path::Path::new(dir)))
                                  .unwrap_or(false) {
        ("post", POST_MD)
    } else {
        ("page", INDEX_MD)
    };

    let doc = wildwest::DocumentBuilder::parse(doc)?;
    let wildwest::DocumentBuilder { front, content } = doc;
    let mut front = front.object();
    front.insert("title".to_owned(), liquid::Value::str(title));
    let front = wildwest::FrontmatterBuilder::with_object(front);
    let doc = wildwest::DocumentBuilder { front, content };
    let doc = doc.to_string();

    create_file(&file, &doc)?;
    info!("Created new {} {:?}", file_type, rel_file);

    Ok(())
}

fn create_file<P: AsRef<path::Path>>(path: P, content: &str) -> Result<()> {
    create_file_for_path(path.as_ref(), content)
}

fn create_file_for_path(path: &path::Path, content: &str) -> Result<()> {
    trace!("Creating file {:?}", path);

    let mut file = fs::OpenOptions::new()
        .write(true)
        .create_new(true)
        .open(path)
        .chain_err(|| format!("Failed to create file {:?}", path))?;

    file.write_all(content.as_bytes())?;

    Ok(())
}

pub fn publish_document(file: &path::Path) -> Result<()> {
    let doc = files::read_file(file)?;
    let doc = wildwest::DocumentBuilder::parse(&doc)?;
    let wildwest::DocumentBuilder { front, content } = doc;

    let date = datetime::DateTime::now();
    let date = date.format();

    let mut front = front.object();
    front.remove("draft");
    front.insert("date".to_owned(), liquid::Value::Str(date));

    let front = wildwest::FrontmatterBuilder::with_object(front);
    let doc = wildwest::DocumentBuilder { front, content };
    let doc = doc.to_string();

    files::write_document_file(doc, file)?;

    Ok(())
}