// Copyright 2016 Joe Wilm, The Alacritty Project Contributors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
extern crate log;
use clap::{Arg, App};
use index::{Line, Column};

const DEFAULT_TITLE: &'static str = "Alacritty";

/// Options specified on the command line
pub struct Options {
    pub print_events: bool,
    pub ref_test: bool,
    pub columns: Column,
    pub lines: Line,
    pub title: String,
    pub log_level: log::LogLevelFilter
}

impl Default for Options {
    fn default() -> Options {
        Options {
            print_events: false,
            ref_test: false,
            columns: Column(80),
            lines: Line(24),
            title: DEFAULT_TITLE.to_owned(),
            log_level: log::LogLevelFilter::Warn
        }
    }
}

impl Options {
    /// Build `Options` from command line arguments
    pub fn load() -> Options {
        let mut options = Options::default();

        let matches = App::new(crate_name!())
            .version(crate_version!())
            .author(crate_authors!("\n"))
            .about(crate_description!())
            .arg(Arg::with_name("ref-test")
                .long("ref-test")
                .help("Generates ref test"))
            .arg(Arg::with_name("print-events")
                .long("print-events"))
            .arg(Arg::with_name("dimensions")
                .long("dimensions")
                .short("d")
                .value_names(&["columns", "lines"])
                .help("Defines the window dimensions [default: 80x24]"))
            .arg(Arg::with_name("title")
                .long("title")
                .short("t")
                .default_value(DEFAULT_TITLE)
                .help("Defines the window title"))
            .arg(Arg::with_name("q")
                .short("q")
                .multiple(true)
                .conflicts_with("v")
                .help("Reduces the level of verbosity (the min level is -qq)"))
            .arg(Arg::with_name("v")
                .short("v")
                .multiple(true)
                .conflicts_with("q")
                .help("Increases the level of verbosity (the max level is -vvv)"))
            .get_matches();

        if matches.is_present("ref-test") {
            options.ref_test = true;
        }

        if matches.is_present("print-events") {
            options.print_events = true;
        }

        if let Some(mut dimensions) = matches.values_of("dimensions") {
            dimensions.next().map(|w| w.parse().map(|w| options.columns = Column(w)));
            dimensions.next().map(|h| h.parse().map(|h| options.lines = Line(h)));
        }

        if let Some(title) = matches.value_of("title") {
            options.title = title.to_owned();
        }

        match matches.occurrences_of("q") {
            0 => {},
            1 => options.log_level = log::LogLevelFilter::Error,
            2 | _ => options.log_level = log::LogLevelFilter::Off
        }

        match matches.occurrences_of("v") {
            0 => {},
            1 => options.log_level = log::LogLevelFilter::Info,
            2 => options.log_level = log::LogLevelFilter::Debug,
            3 | _ => options.log_level = log::LogLevelFilter::Trace
        }

        options
    }

    pub fn lines_u32(&self) -> u32 {
        self.lines.0 as u32
    }

    pub fn columns_u32(&self) -> u32 {
        self.columns.0 as u32
    }
}