/*
    hitomezashi-rs  Classic two-colored Hitomezashi stitch pattern generator
    Copyright (C) 2024  Nicholas Johnson

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/

use clap::Parser;
use std::ops::RangeInclusive;

#[derive(Parser)]
#[command(version, about, author, long_about = None)] // Read from `Cargo.toml`
struct Cli {
    /// Pattern width
    #[arg(value_parser = dimension_in_range)]
    width: usize,

    /// Pattern height
    #[arg(value_parser = dimension_in_range)]
    height: usize,

    /// Set skew. Skew values near 0 or 1 generate orderly patterns. Skew values near 0.5 generate chaotic patterns.
    #[arg(short, long)]
    #[arg(default_value_t = 0.5)]
    #[arg(value_parser = skew_in_range)]
    skew: f64,
}


const DIMENSION_RANGE: RangeInclusive<usize> = 1..=std::usize::MAX;

fn dimension_in_range(s: &str) -> Result<usize, String> {
    let dimension: usize = s
        .parse()
        .map_err(|_| format!("`{s}` isn't a dimension value!"))?;

    if DIMENSION_RANGE.contains(&dimension) {
        Ok(dimension)
    } else {
        Err(format!(
            "Dimension not in range {}-{}",
            DIMENSION_RANGE.start(),
            DIMENSION_RANGE.end()
        ))
    }
}

const SKEW_RANGE: RangeInclusive<f64> = 0.0..=1.0;

fn skew_in_range(s: &str) -> Result<f64, String> {
    let skew: f64 = s
        .parse()
        .map_err(|_| format!("`{s}` isn't a skew value!"))?;

    if SKEW_RANGE.contains(&skew) {
        Ok(skew)
    } else {
        Err(format!(
            "Skew not in range {}-{}",
            SKEW_RANGE.start(),
            SKEW_RANGE.end()
        ))
    }
}