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use std::io::{Read, Write};
use std::path::PathBuf;
use serde_json::json;
use tera::{Context, Tera};
use crate::error::{Error, Raise};
use crate::project::{Chapter, Cover, Language, Project};
use std::collections::HashSet;
use std::fs::File;
use zip::write::FileOptions;
use zip::ZipWriter;
use crate::assets::{fonts_dir, template_dir};
use crate::writer::BookWriter;
const EPUB_MIMETYPE : &'static str = "application/epub+zip";
pub trait EpubWriter: BookWriter {
fn create_mimetype(&mut self) -> Result<(), Error> {
self.write_bytes(&PathBuf::from("mimetype"), EPUB_MIMETYPE.as_bytes())
}
fn create_container(&mut self, tera : &Tera) -> Result<(), Error> {
self.write_template(
&PathBuf::from("META-INF/container.xml"),
tera,
"epub/container.xml",
&Context::default(),
)
}
fn create_chapters(
&mut self,
tera : &Tera,
chapters : &Vec<Chapter<String>>,
numbering : bool,
lang : &Language,
) -> Result<(), Error> {
chapters
.iter()
.enumerate()
.map(|(idx, c)| {
let mut ctx = Context::new();
ctx.insert("number", &(idx + 1));
ctx.insert("chapter", &c);
ctx.insert("numbering", &numbering);
ctx.insert("language", &lang);
let path : String = format!("{}.xhtml", idx);
self.write_template(
&PathBuf::from(format!("OEBPS/Text/{}", path)),
tera,
"epub/chapter.xhtml",
&ctx,
)?;
Ok(path)
})
.collect::<Result<Vec<String>, Error>>()?;
Ok(())
}
fn install_fonts(&mut self, assets : &PathBuf, fonts : &Vec<&str>) -> Result<(), Error> {
for f in fonts {
let src = fonts_dir(assets)?.join(f);
let dst = PathBuf::from("OEBPS/Fonts").join(f);
self.write_file(&dst, &src)?;
}
Ok(())
}
fn install_cover(&mut self, cover : &Cover) -> Result<(), Error> {
let dst = PathBuf::from("OEBPS").join(format!("cover.{}", cover.extension));
self.write_bytes(&dst, cover.content.as_slice())
}
fn generate_epub(
&mut self,
project : &Project<Cover, String>,
assets : &PathBuf,
) -> Result<(), Error> {
let tera =
Tera::new(template_dir(assets)?.as_str()).or_raise("Could not build templates")?;
self.create_mimetype()?;
self.create_container(&tera)?;
self.create_chapters(
&tera,
&project.chapters,
project.numbering.unwrap_or(false),
&project.language,
)?;
self.write_template(
&PathBuf::from("OEBPS/Style/main.css"),
&tera,
"epub/main.css",
&Context::new(),
)?;
if let Some(ref cov) = project.cover {
self.install_cover(cov)?;
}
let fonts = vec![
"et-book-roman-line-figures.ttf",
"et-book-bold-line-figures.ttf",
"et-book-display-italic-old-style-figures.ttf",
];
self.install_fonts(assets, &fonts)?;
let files = project
.chapters
.iter()
.enumerate()
.map(|(idx, _)| idx)
.collect::<Vec<usize>>();
let mut ctx = Context::new();
ctx.insert("title", &project.title);
ctx.insert("author", &project.author);
ctx.insert(
"cover_extension",
&project.cover.as_ref().map(|x| x.extension.clone()),
);
ctx.insert("files", &files);
ctx.insert("fonts", &fonts);
ctx.insert("language", &project.language);
self.write_template(
&PathBuf::from("OEBPS/content.opf"),
&tera,
"epub/content.opf",
&ctx,
)?;
let chaps : Vec<_> = project
.chapters
.iter()
.enumerate()
.map(|(idx, chapter)| {
json!({
"index": idx,
"title": chapter.title,
})
})
.collect();
let mut ctx = Context::new();
ctx.insert("chapters", &chaps);
self.write_template(&PathBuf::from("OEBPS/toc.ncx"), &tera, "epub/toc.ncx", &ctx)?;
Ok(())
}
}
impl<W> EpubWriter for W where W : BookWriter {}
pub struct Zip {
output : ZipWriter<File>,
dirs : HashSet<PathBuf>,
}
impl Zip {
pub fn init() -> Result<Zip, Error> {
let file = File::create("Book.epub").or_raise("Could not create Book.epub")?;
Ok(Zip {
output : ZipWriter::new(file),
dirs : HashSet::new(),
})
}
fn create_parent(&mut self, dst : &PathBuf) -> Result<(), Error> {
if let Some(dir) = dst.parent() {
if self.dirs.contains(dir) {
self.output
.add_directory_from_path(dir, FileOptions::default())
.or_raise(&format!("Could not create directory {:?}", dir))?;
self.dirs.insert(dir.to_path_buf());
}
}
Ok(())
}
}
impl BookWriter for Zip {
fn write_bytes(&mut self, dst : &PathBuf, input : &[u8]) -> Result<(), Error> {
self.create_parent(dst)?;
self.output
.start_file_from_path(dst, FileOptions::default())
.or_raise(&format!("Could not add file {:?} to archive", dst))?;
self.output
.write_all(input)
.or_raise(&format!("Could not write {:?} content", dst))?;
Ok(())
}
fn write_file(&mut self, dst : &PathBuf, src : &PathBuf) -> Result<(), Error> {
let mut buffer = Vec::new();
let mut f = File::open(src).or_raise(&format!("Could not open {:?}", src))?;
f.read_to_end(&mut buffer)
.or_raise(&format!("Could not read {:?} content", src))?;
self.create_parent(dst)?;
self.output
.start_file_from_path(dst, FileOptions::default())
.or_raise(&format!("Could not add file {:?} to archive", dst))?;
self.output
.write_all(buffer.as_ref())
.or_raise(&format!("Could not write {:?} content", dst))?;
Ok(())
}
}
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