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use std::str::FromStr;
use std::result;

use thiserror::Error;

use apigpio::*;
use crate::ledpins;

struct Sequence {
  desc : String,
  pulses : Vec<Pulse>,
}

type SeqTime = u32;

static START_BIT   : SeqTime = 1540;
static START_DELAY : SeqTime = 80;
static SPACE       : SeqTime = 1040;
static ZERO_BIT    : SeqTime = 220;
static ZERO_DELAY  : SeqTime = SPACE - ZERO_BIT;
static ONE_BIT     : SeqTime = 740;
static ONE_DELAY   : SeqTime = SPACE - ONE_BIT;
static EOS_DELAY   : SeqTime = 7600;

pub const GPIO : u32 = ledpins::XMIT;

#[derive(Copy,Clone,Debug,Eq,PartialEq)]
pub struct CollarKey (pub u16);

#[derive(Error,Debug,Copy,Clone,Eq,PartialEq)]
pub enum CollarKeyParseError {
  #[error("collar key is wrong length, should be 4 characters")]
  WrongLength,
  #[error("collar contains invalid hex digits")]
  BadCharacters,
}

impl FromStr for CollarKey {
  type Err = CollarKeyParseError;
  fn from_str(s : &str) -> result::Result<Self, Self::Err>
  {
    use CollarKeyParseError::*;
    if s.len() != 4 { Err(WrongLength)? }
    Ok(CollarKey( u16::from_str_radix(s, 16).map_err(|_| BadCharacters)? ))
  }
}

impl Sequence {
  fn new() -> Sequence {
    let mut s = Sequence {
      desc : String::new(),
      pulses : Vec::with_capacity(100),
    };
    s.pulse_onoff(START_BIT, START_DELAY, "START");
    s
  }
  fn finish(mut self) -> (Vec<Pulse>, String) {
    self.desc += " EOS";
    self.pulses.push(Pulse { on_mask : 0,
                             off_mask : 0,
                             us_delay : EOS_DELAY });
    (self.pulses, self.desc)
  }
  fn pulse_on(&mut self, us : SeqTime) {
    self.pulses.push(Pulse { on_mask : 1 << GPIO,
                             off_mask : 0,
                             us_delay : us });
  }
  fn pulse_off(&mut self, us : SeqTime) {
    self.pulses.push(Pulse { on_mask : 0,
                             off_mask : 1 << GPIO,
                             us_delay : us });
  }
  fn pulse_onoff(&mut self, on_time : SeqTime, off_time : SeqTime,
                 what : &str) {
    self.desc += what;
    self.pulse_on(on_time);
    self.pulse_off(off_time);
  }
  fn pulse_bit(&mut self, bit : bool) {
    match bit {
    false => self.pulse_onoff(ZERO_BIT, ZERO_DELAY, "0"),
    true => self.pulse_onoff(ONE_BIT, ONE_DELAY, "1"),
    }
  }
  fn pulse_bits(&mut self, count : usize, bits : u32) {
    self.desc += " ";
    assert!(count > 0);
    for i in (0..count).rev() {
      self.pulse_bit( bits & (1 << i) != 0 );
    }
  }
  fn pulse_bits_rev(&mut self, count : usize, bits : u32) {
    self.desc += " ";
    assert!(count > 0);
    for i in 0..count {
      self.pulse_bit( bits & (1 << i) == 0 );
    }
  }
}


#[derive(Debug,Copy,Clone)]
pub enum Mode {
  Flash,
  Beep,
  Vibrate,
  Shock,
}
use Mode::*;

impl Mode {
  pub fn needs_power(self) -> bool {
    match self {
      Flash   => false,
      Vibrate => true,
      Beep    => false,
      Shock   => true,
    }
  }
}

#[derive(Debug)]
pub struct ParseModeError ();

impl std::str::FromStr for Mode {
  type Err = ParseModeError;
  fn from_str(s: &str) -> std::result::Result<Self, Self::Err> {
    Ok(match s.to_ascii_lowercase().as_ref() {
      "f" | "flash"   => Flash,
      "b" | "beep"    => Beep,
      "v" | "vibrate" => Vibrate,
            "shock"   => Shock,
      _ => Err(ParseModeError())?,
    })
  }
}

pub struct Command {
  pub key : CollarKey,
  pub channel : u8,
  pub mode : Mode,
  pub power : u8,
}

pub fn mk_pulses(c : &Command) -> (Vec<Pulse>, String) {
  let chanseq : u32 = match c.channel {
    0 => 0b000,
    1 => 0b111,
    _ => panic!("bad channel"),
  };
  let modeseq : u32 = match c.mode {
    Flash   => 0b1000,
    Beep    => 0b0100,
    Vibrate => 0b0010,
    Shock   => 0b0001,
  };
  assert!( c.power <= 100 );

  let mut seq = Sequence::new();
  seq.pulse_bits(1, 0b1);
  seq.pulse_bits(3, chanseq);
  seq.pulse_bits(4, modeseq);
  seq.pulse_bits(16, c.key.0 as u32);
  seq.pulse_bits(8, c.power as u32);
  seq.pulse_bits_rev(4, modeseq);
  seq.pulse_bits_rev(3, chanseq);
  seq.pulse_bits(2, 0b00);
  seq.finish()
}