novel-cli 0.17.0

use std::env;
use std::path::PathBuf;
use std::process::Command;

use clap::Args;
use color_eyre::eyre::{self, Result};
use fluent_templates::Loader;
use fs_extra::dir::CopyOptions;
use mdbook_driver::MDBook;
use walkdir::WalkDir;

use crate::utils::{self, CurrentDir};
use crate::{LANG_ID, LOCALES};

#[must_use]
#[derive(Args)]
#[command(arg_required_else_help = true,
    about = LOCALES.lookup(&LANG_ID, "build_command"))]
pub struct Build {
    #[arg(help = LOCALES.lookup(&LANG_ID, "build_path"))]
    pub build_path: PathBuf,

    #[arg(short, long, default_value_t = false,
        help = LOCALES.lookup(&LANG_ID, "delete"))]
    pub delete: bool,

    #[arg(short, long, default_value_t = false,
        help = LOCALES.lookup(&LANG_ID, "open"))]
    pub open: bool,
}

pub fn execute(config: Build) -> Result<()> {
    if utils::is_mdbook_dir(&config.build_path)? {
        execute_mdbook(config)?;
    } else {
        execute_pandoc(config)?;
    }
    println!("{}", utils::locales("build_complete_msg", "👌"));

    Ok(())
}

fn execute_mdbook(config: Build) -> Result<()> {
    println!("{}", utils::locales_with_arg("build_msg", "📚", "mdBook"));

    let input_mdbook_dir_path = dunce::canonicalize(&config.build_path)?;
    tracing::info!(
        "Input mdBook directory path: `{}`",
        input_mdbook_dir_path.display()
    );

    let book_path = input_mdbook_dir_path.join("book");

    if book_path.try_exists()? {
        tracing::warn!("The mdBook output directory already exists and will be deleted");
        utils::remove_file_or_dir(&book_path)?;
    }

    match MDBook::load(&input_mdbook_dir_path) {
        Ok(mdbook) => {
            if let Err(error) = mdbook.build() {
                eyre::bail!("mdBook failed to build: {error}");
            }
        }
        Err(error) => {
            eyre::bail!("mdBook failed to load: {error}");
        }
    }

    if config.delete {
        for entry in WalkDir::new(&input_mdbook_dir_path).max_depth(1) {
            let path = entry?.path().to_path_buf();

            if path != input_mdbook_dir_path && path != book_path {
                utils::remove_file_or_dir(path)?;
            }
        }

        let mut options = CopyOptions::new();
        options.copy_inside = true;
        options.content_only = true;
        fs_extra::dir::move_dir(&book_path, &input_mdbook_dir_path, &options)?;
    }

    if config.open {
        let index_html_path = if config.delete {
            input_mdbook_dir_path.join("index.html")
        } else {
            book_path.join("index.html")
        };

        open::that(index_html_path)?;
    }

    Ok(())
}

fn execute_pandoc(config: Build) -> Result<()> {
    utils::ensure_executable_exists("pandoc")?;

    let input_file_path;
    let input_file_parent_path;
    let mut in_directory = false;

    if utils::is_markdown_or_txt_file(&config.build_path)? {
        input_file_path = dunce::canonicalize(&config.build_path)?;
        input_file_parent_path = input_file_path.parent().unwrap().to_path_buf();
    } else if let Ok(Some(path)) =
        utils::try_get_markdown_or_txt_file_name_in_dir(&config.build_path)
    {
        in_directory = true;

        input_file_path = path;
        input_file_parent_path = dunce::canonicalize(&config.build_path)?;
    } else {
        eyre::bail!("Invalid input path: `{}`", config.build_path.display());
    }
    tracing::info!("Input file path: `{}`", input_file_path.display());
    println!("{}", utils::locales_with_arg("build_msg", "📚", "Pandoc"));

    let output_epub_file_path =
        env::current_dir()?.join(utils::read_markdown_to_epub_file_name(&input_file_path)?);
    tracing::info!(
        "Output epub file path: `{}`",
        output_epub_file_path.display()
    );

    if output_epub_file_path.try_exists()? {
        tracing::warn!("The epub output file already exists and will be deleted");
        utils::remove_file_or_dir(&output_epub_file_path)?;
    }

    let current_dir = CurrentDir::new(&input_file_parent_path)?;
    let output = Command::new("pandoc")
        .arg("--from=commonmark+yaml_metadata_block")
        .arg("--to=epub3")
        .arg("--split-level=2")
        .arg("--epub-title-page=false")
        .args(["-o", output_epub_file_path.to_str().unwrap()])
        .arg(&input_file_path)
        .output()?;

    tracing::info!("{}", simdutf8::basic::from_utf8(&output.stdout)?);

    if !output.status.success() {
        tracing::error!("{}", simdutf8::basic::from_utf8(&output.stderr)?);
        eyre::bail!("`pandoc` failed to execute");
    }

    if config.delete {
        if in_directory {
            // On Windows, the current working directory will be occupied and cannot be deleted
            current_dir.restore()?;
            utils::remove_file_or_dir(input_file_parent_path)?;
        } else {
            let images = utils::read_markdown_to_images(&input_file_path)?;
            utils::remove_file_or_dir_all(&images)?;

            utils::remove_file_or_dir(input_file_path)?;

            current_dir.restore()?;
        }
    }

    if config.open {
        open::that(output_epub_file_path)?;
    }

    Ok(())
}