#![warn(trivial_casts, trivial_numeric_casts)]
#![warn(unused_qualifications)]
#![warn(unused_results)]

extern crate ansi_term;
extern crate datetime;
extern crate getopts;
extern crate libc;
extern crate locale;
extern crate natord;
extern crate num_cpus;
extern crate number_prefix;
extern crate scoped_threadpool;
extern crate term_grid;
extern crate unicode_width;
extern crate users;
extern crate zoneinfo_compiled;

#[cfg(feature="git")] extern crate git2;
#[macro_use] extern crate lazy_static;

use std::env;
use std::io::{Write, stdout, Result as IOResult};
use std::path::{Component, Path};
use std::process;

use fs::{Dir, File};
use options::{Options, View};

mod fs;
mod info;
mod options;
mod output;
mod term;


/// The main program wrapper.
struct Exa<'w, W: Write + 'w> {

    /// List of command-line options, having been successfully parsed.
    options: Options,

    /// The output handle that we write to. When running the program normally,
    /// this will be `std::io::Stdout`, but it can accept any struct that’s
    /// `Write` so we can write into, say, a vector for testing.
    writer: &'w mut W,
}

impl<'w, W: Write + 'w> Exa<'w, W> {
    fn run(&mut self, mut args_file_names: Vec<String>) -> IOResult<()> {
        let mut files = Vec::new();
        let mut dirs = Vec::new();

        if args_file_names.is_empty() {
            args_file_names.push(".".to_owned());
        }

        for file_name in args_file_names.iter() {
            match File::from_path(Path::new(&file_name), None) {
                Err(e) => {
                    try!(writeln!(self.writer, "{}: {}", file_name, e));
                },
                Ok(f) => {
                    if f.is_directory() && !self.options.dir_action.treat_dirs_as_files() {
                        match f.to_dir(self.options.should_scan_for_git()) {
                            Ok(d) => dirs.push(d),
                            Err(e) => try!(writeln!(self.writer, "{}: {}", file_name, e)),
                        }
                    }
                    else {
                        files.push(f);
                    }
                },
            }
        }

        let no_files = files.is_empty();
        let is_only_dir = dirs.len() == 1 && no_files;

        if !no_files {
            try!(self.print_files(None, files));
        }

        self.print_dirs(dirs, no_files, is_only_dir)
    }

    fn print_dirs(&mut self, dir_files: Vec<Dir>, mut first: bool, is_only_dir: bool) -> IOResult<()> {
        for dir in dir_files {

            // Put a gap between directories, or between the list of files and the
            // first directory.
            if first {
                first = false;
            }
            else {
                try!(write!(self.writer, "\n"));
            }

            if !is_only_dir {
                try!(writeln!(self.writer, "{}:", dir.path.display()));
            }

            let mut children = Vec::new();
            for file in dir.files() {
                match file {
                    Ok(file)       => children.push(file),
                    Err((path, e)) => try!(writeln!(self.writer, "[{}: {}]", path.display(), e)),
                }
            };

            self.options.filter.filter_files(&mut children);
            self.options.filter.sort_files(&mut children);

            if let Some(recurse_opts) = self.options.dir_action.recurse_options() {
                let depth = dir.path.components().filter(|&c| c != Component::CurDir).count() + 1;
                if !recurse_opts.tree && !recurse_opts.is_too_deep(depth) {

                    let mut child_dirs = Vec::new();
                    for child_dir in children.iter().filter(|f| f.is_directory()) {
                        match child_dir.to_dir(false) {
                            Ok(d)  => child_dirs.push(d),
                            Err(e) => try!(writeln!(self.writer, "{}: {}", child_dir.path.display(), e)),
                        }
                    }

                    try!(self.print_files(Some(&dir), children));

                    if !child_dirs.is_empty() {
                        try!(self.print_dirs(child_dirs, false, false));
                    }

                    continue;
                }
            }

            try!(self.print_files(Some(&dir), children));
        }

        Ok(())
    }

    fn print_files(&mut self, dir: Option<&Dir>, files: Vec<File>) -> IOResult<()> {
        match self.options.view {
            View::Grid(g)         => g.view(&files, self.writer),
            View::Details(d)      => d.view(dir, files, self.writer),
            View::GridDetails(gd) => gd.view(dir, files, self.writer),
            View::Lines(l)        => l.view(files, self.writer),
        }
    }
}


fn main() {
    let args: Vec<String> = env::args().skip(1).collect();

    match Options::getopts(&args) {
        Ok((options, paths)) => {
            let mut stdout = stdout();
            let mut exa = Exa { options: options, writer: &mut stdout };
            exa.run(paths).expect("IO error");
        },
        Err(e) => {
            println!("{}", e);
            process::exit(e.error_code());
        },
    };
}