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use serde_derive::Deserialize;

mod changelog;
mod cli;
mod error;
mod git;

pub use crate::changelog::{format, stats};
pub use crate::cli::Cli;
pub use crate::error::{Error, ErrorKind, Result};
pub use crate::git::{all_commits, full_diff, Commit, Tag};

use failure::ResultExt;
use mktemp::Temp;
use std::env;
use std::fs::{self, File, OpenOptions};
use std::io::{self, Write};
use std::path::PathBuf;

#[derive(Deserialize)]
struct Config {
  package: Package,
}

#[derive(Deserialize)]
struct Package {
  repository: String,
}

/// Get the repository name from `Cargo.toml`.
/// Fallbacks to directory name if `Cargo.toml` does not exists.
pub fn read_repo(dir: &str) -> crate::Result<String> {
  let mut dir = PathBuf::from(dir);
  dir.push("Cargo.toml");

  let config = if dir.exists() {
    let cargo_toml =
      fs::read_to_string(dir).context(crate::ErrorKind::Other)?;
    toml::from_str(&cargo_toml).context(crate::ErrorKind::Other)?
  } else {
    dir.pop();
    Config {
      package: Package {
        repository: read_path_name(&dir).context(crate::ErrorKind::Other)?,
      },
    }
  };
  Ok(config.package.repository)
}

/// Read the path name from a PathBuf
pub fn read_path_name(dir: &PathBuf) -> crate::Result<String> {
  // executable was called with the default path
  let path_name = if dir.eq(&PathBuf::from(".")) {
    let path = env::current_dir()?;

    String::from(
      path
        .file_name()
        .ok_or_else(|| crate::ErrorKind::Other)?
        .to_str()
        .ok_or_else(|| crate::ErrorKind::Other)?,
    )
  } else {
    String::from(
      dir
        .file_name()
        .ok_or_else(|| crate::ErrorKind::Other)?
        .to_str()
        .ok_or_else(|| crate::ErrorKind::Other)?,
    )
  };

  Ok(path_name)
}

/// Prepend a changelog to a file.
pub fn prepend_file(file_path: &str, data: &str) -> crate::Result<()> {
  let file_path = PathBuf::from(file_path);

  // Touch new file if it doesn't exist already
  let file = OpenOptions::new()
    .create(true)
    .append(true)
    .open(&file_path)
    .context(crate::ErrorKind::Other)?;
  file.sync_all().context(crate::ErrorKind::Other)?;

  // Setup temp file & path
  let tmp_path = Temp::new_file().context(crate::ErrorKind::Other)?;
  let mut tmp = File::create(&tmp_path).context(crate::ErrorKind::Other)?;
  let mut src = File::open(&file_path).context(crate::ErrorKind::Other)?;

  // Prepend data
  tmp
    .write_all(data.as_bytes())
    .context(crate::ErrorKind::Other)?;
  tmp.write(b"\n\n").context(crate::ErrorKind::Other)?;
  io::copy(&mut src, &mut tmp).context(crate::ErrorKind::Other)?;

  // Cleanup
  fs::remove_file(&file_path).context(crate::ErrorKind::Other)?;
  fs::copy(&tmp_path, &file_path).context(crate::ErrorKind::Other)?;

  Ok(())
}