use rs_ws281x::RawColor;
use std::{
    vec::Vec,
    string::String
};

type ParseError = Box<dyn std::error::Error>;

trait Pattern {
    fn execute(&self, values: &mut [RawColor]);
    fn parse(args: Vec<String>) -> Result<Self, ParseError>;
}

impl TryFrom<Vec<String>> for Box<dyn Pattern> {
    fn try_from(s: Vec<String>) -> Result<Self, ParseError> {
        match s[0].as_str() {
            "unit" => Unit::parse(s)
            "val" => Value::parse(s)
            _ => Err("No Match".into())
        }
    }
}

struct Unit;
impl<'a> Pattern for Unit<'a> {
    fn execute(&self, values: &'a mut [RawColor]) {}
    fn parse(args: Vec<String>) -> Result<Self, ParseError> {
        Ok(Unit {})
    }
}

struct Value {
    r: Option<u8>,
    g: Option<u8>,
    b: Option<u8>
};
impl<'a> Pattern for Value<'a> {
    fn execute(&self, values: &'a mut [RawColor]) {
        for i in 0..crate::LED_SIZE {
            let color: RawColor = values[i];
            if self.r.is_some() {
                color[0] = self.r.unwrap();   
            }
            if self.g.is_some() {
                color[0] = self.g.unwrap();   
            }
            if self.b.is_some() {
                color[0] = self.b.unwrap();   
            }
            values[i]
        }
    }
    fn parse(args: Vec<String>) -> Result<Self, ParseError> {
        let param1 = params[1].parse::<u8>();
        let param2 = params[2].parse::<u8>();
        let param3 = params[2].parse::<u8>();
        if param1.is_ok() && param2.is_ok() && param3.is_ok() {
            Ok(Value{
                r: param1.unwrap(),
                g: param2.unwrap(),
                b: param3.unwrap()
            })
        }
        else {
            match param2 {
                Ok(i) => match params[1].as_str() {
                    "r" => {
                        Ok(i) => Ok(Value {
                            r: Some(i),
                            g: None,
                            b: None
                        })
                    },
                    "g" => {
                        Ok(Value {
                            r: None,
                            g: Some(i),
                            b: None
                        })
                    },
                    "b" => {
                        Ok(i) => Ok(Value {
                            r: None,
                            g: None,
                            b: Some(i)
                        })
                    }
                },
                Err() => Err() 
            }
        }
    }
}

pub fn parse_line(v: Vec<String>) -> Result<Box<dyn Pattern>, ParseError> {

}