#[macro_use]
extern crate clap;
extern crate ansi_term;
extern crate atty;
extern crate regex;
extern crate ignore;
extern crate num_cpus;

pub mod lscolors;
pub mod fshelper;
mod app;
mod internal;
mod output;
mod walk;

use std::env;
use std::error::Error;
use std::path::Path;
use std::sync::Arc;
use std::time;

use atty::Stream;
use regex::RegexBuilder;

use internal::{error, FdOptions, PathDisplay, ROOT_DIR};
use lscolors::LsColors;
use walk::FileType;

fn main() {
    let matches = app::build_app().get_matches();

    // Get the search pattern
    let empty_pattern = String::new();
    let pattern = matches.value_of("pattern").unwrap_or(&empty_pattern);

    // Get the current working directory
    let current_dir_buf = match env::current_dir() {
        Ok(cd) => cd,
        Err(_) => error("Error: could not get current directory.")
    };
    let current_dir = current_dir_buf.as_path();

    // Get the root directory for the search
    let mut root_dir_is_absolute = false;
    let root_dir_buf = if let Some(rd) = matches.value_of("path") {
        let path = Path::new(rd);

        root_dir_is_absolute = path.is_absolute();

        fshelper::absolute_path(path).unwrap_or_else(
            |_| error(&format!("Error: could not find directory '{}'.", rd))
        )
    } else {
        current_dir_buf.clone()
    };

    if !root_dir_buf.is_dir() {
        error(&format!("Error: '{}' is not a directory.", root_dir_buf.to_string_lossy()));
    }

    let root_dir = root_dir_buf.as_path();

    // The search will be case-sensitive if the command line flag is set or
    // if the pattern has an uppercase character (smart case).
    let case_sensitive = if !matches.is_present("ignore-case") {
        matches.is_present("case-sensitive") || pattern.chars().any(char::is_uppercase)
    } else {
        false
    };

    let colored_output = match matches.value_of("color") {
        Some("always") => true,
        Some("never") => false,
        _ => atty::is(Stream::Stdout)
    };

    let ls_colors =
        if colored_output {
            Some(
                env::var("LS_COLORS")
                    .ok()
                    .map(|val| LsColors::from_string(&val))
                    .unwrap_or_default()
            )
        } else {
            None
        };

    let config = FdOptions {
        case_sensitive:    case_sensitive,
        search_full_path:  matches.is_present("full-path"),
        ignore_hidden:     !(matches.is_present("hidden") || matches.occurrences_of("rg-alias-hidden-ignore") >= 2),
        read_ignore:       !(matches.is_present("no-ignore") || matches.is_present("rg-alias-hidden-ignore")),
        follow_links:      matches.is_present("follow"),
        null_separator:    matches.is_present("null_separator"),
        max_depth:         matches.value_of("depth")
                                   .and_then(|n| usize::from_str_radix(n, 10).ok()),
        threads:           std::cmp::max(
                             matches.value_of("threads")
                                    .and_then(|n| usize::from_str_radix(n, 10).ok())
                                    .unwrap_or_else(num_cpus::get),
                             1
                           ),
        max_buffer_time:   matches.value_of("max-buffer-time")
                                  .and_then(|n| u64::from_str_radix(n, 10).ok())
                                  .map(time::Duration::from_millis),
        path_display:      if matches.is_present("absolute-path") || root_dir_is_absolute {
                               PathDisplay::Absolute
                           } else {
                               PathDisplay::Relative
                           },
        ls_colors:         ls_colors,
        file_type:         match matches.value_of("file-type") {
                               Some("f") | Some("file") => FileType::RegularFile,
                               Some("d") | Some("directory") => FileType::Directory,
                               Some("l") | Some("symlink") => FileType::SymLink,
                               _  => FileType::Any,
                           },
        extension:         matches.value_of("extension")
                                  .map(|e| e.trim_left_matches('.').to_lowercase()),
    };

    let root = Path::new(ROOT_DIR);
    let base = match config.path_display {
        PathDisplay::Relative => current_dir,
        PathDisplay::Absolute => root
    };

    match RegexBuilder::new(pattern)
              .case_insensitive(!config.case_sensitive)
              .build() {
        Ok(re)   => walk::scan(root_dir, Arc::new(re), base, Arc::new(config)),
        Err(err) => error(err.description())
    }
}