use crate::notes::{Note, BaseNote, Notes, NoteValue, ProcerNote, ProcerNotes};
use std::collections::VecDeque;
use std::io::Write;
use std::fmt::{Debug};
use realfft::FftNum;
//use clap::{Args,Subcommand};

//use std::io;
use crossterm::terminal;
use crossterm::style::{Stylize, Color};
use tui::{backend::CrosstermBackend, Terminal};
use serde::{Serialize, Deserialize};
use ansi_colours::rgb_from_ansi256;


trait ToRgbVal {
    fn to_rgb_value(&self) -> (u8, u8, u8);
}

impl ToRgbVal for Color {
    fn to_rgb_value(&self) -> (u8, u8, u8) {
        match self {
            Color::Rgb {r, g, b} => (*r, *g, *b),
            // I'll use the tango colours for the colour constants
            // but the Ansi lookup table for the Ansi versions
            Color::Reset => (0, 0, 0),
            Color::Black => (0, 0, 0),
            Color::DarkRed => (204, 0, 0),
            Color::DarkGreen => (78, 154, 6),
            Color::DarkYellow => (196, 160, 0),
            Color::DarkBlue => (54, 101, 164),
            Color::DarkMagenta => (117, 80, 123),
            Color::DarkCyan => (6, 152, 154),
            Color::Grey => (211, 215, 207),
            Color::DarkGrey => (85, 87, 83),
            Color::Red => (239, 41, 41),
            Color::Green => (138, 226, 52),
            Color::Yellow => (252, 233, 79),
            Color::Blue => (114, 159, 207),
            Color::Magenta => (173, 127, 168),
            Color::Cyan => (52, 226, 226),
            Color::White => (238, 238, 236),
            Color::AnsiValue(ansi) => rgb_from_ansi256(*ansi),
        }
    }
}

#[derive(Clone, Serialize, Deserialize)]
pub struct ColourScheme {
    pub a: Color, pub as_: Color,
    pub b: Color,
    pub c: Color, pub cs: Color,
    pub d: Color, pub ds: Color,
    pub e: Color,
    pub f: Color, pub fs: Color,
    pub g: Color, pub gs: Color,
}

impl ColourScheme {
    fn get_colour(&self, note: Notes) -> Color {
        match note {
            Notes::C => self.c,
            Notes::Cs => self.cs,
            Notes::D => self.d,
            Notes::Ds => self.ds,
            Notes::E => self.e,
            Notes::F => self.f,
            Notes::Fs => self.fs,
            Notes::G => self.g,
            Notes::Gs => self.gs,
            Notes::A => self.a,
            Notes::As => self.as_,
            Notes::B => self.b,
        }
    }
}

impl Default for ColourScheme {
    fn default() -> Self {
        let c = Color::Rgb {r: 140, g: 255, b: 210};
        return Self {
            a: c, as_: c,
            b: c,
            c: c, cs: c,
            d: c, ds: c,
            e: c,
            f: c, fs: c,
            g: c, gs: c,
        }
    }
}

pub trait Outputer<I: FftNum + NoteValue> {
    fn setup(&mut self);
    fn handle_pnotes(&mut self, notes: &mut ProcerNotes<I>);
}

pub enum Outputers {
    Simple(SimpleOutputer),
    LineLayout(LineLayout),
    Tui(TuiOutputer),
}

pub struct SimpleOutputer;
pub struct LineLayout {
    term_width: usize,
    notes_per_line: usize,
    last_line: String,
    empty: String,
    last_was_empty: bool,
    use_colour: bool,
    //max_c: (f32, f32, f32),
    colours: ColourScheme,
    max_threshold: f32,
    //threshold: f32,
}
pub struct TuiOutputer {
    terminal: Terminal<tui::backend::CrosstermBackend<std::io::Stdout>>,
}

impl<I: FftNum + NoteValue> Outputer<I> for SimpleOutputer {
    fn setup(&mut self) {}
    fn handle_pnotes(&mut self, notes: &mut ProcerNotes<I>) {
        notes.0.sort_unstable_by(|pn1, pn2| (-(pn1.3)).partial_cmp(&-(pn2.3)).unwrap());
        print!("\r{:-80}", notes);
        std::io::stdout().flush().unwrap();
    }
}

pub fn line_note_char(note: &Note) -> char {
    match note.note.0 {
        Notes::C => 'c',
        Notes::Cs => match note.octave % 10 {
            0 => '0',
            1 => '1',
            2 => '2',
            3 => '3',
            4 => '4',
            5 => '5',
            6 => '6',
            7 => '7',
            8 => '8',
            9 => '9',
            _ => ' ',
        },
        Notes::D => 'd',
        Notes::Ds => ' ',
        Notes::E => 'e',
        Notes::F => 'f',
        Notes::Fs => ' ',
        Notes::G => 'g',
        Notes::Gs => ' ',
        Notes::A => 'a',
        Notes::As => ' ',
        Notes::B => 'b'
    }
}

impl LineLayout {
    pub fn new(max_threshold: f32, use_colour: bool, colours: ColourScheme, notes: &[Note]) -> Self {
        let term_width = terminal::size().unwrap().0 as usize;
        let note_count = std::cmp::min(notes.len(), term_width);
        return Self {
            term_width, use_colour, colours, max_threshold, notes_per_line: note_count,
            last_line: notes[0..note_count].iter().map(line_note_char).collect(),
            empty: " ".repeat(term_width),
            last_was_empty: true,
        }
    }

    pub fn line_bw<I: FftNum + NoteValue>(&self, note_count: usize, notes: &ProcerNotes<I>) {
        print!("\r");
        let itx: String = notes.0[0..note_count].iter().map(|note| {
            if note.3 >= notes.1 {
                '▉'
            } else {
                ' '
            }
        }).collect();
        print!("{}\n{}", itx, self.last_line);
        std::io::stdout().flush().unwrap();
    }

    pub fn line_colour<I: FftNum + NoteValue>(&self, note_count: usize, notes: &ProcerNotes<I>) {
        print!("\r");
        // TODO: do grouping to avoid excessive control characters
        // for now this just does the simplest thing though
        for note in &notes.0[0..note_count] {
            if note.3 >= notes.1 {
                let mut bright: f32 = note.3.to_f32().unwrap() / self.max_threshold;
                if bright > 1.0 {
                    bright = 1.0;
                }
                let (r, g, b) = self.colours.get_colour(note.0.note.0).to_rgb_value();
                print!("{}", ' '.on(Color::Rgb {
                    r: (r as f32 * bright) as u8,
                    g: (g as f32 * bright) as u8,
                    b: (b as f32 * bright) as u8,
                }));
            } else {
                print!(" ");
            }
        }
        print!("\n{}", self.last_line);
        std::io::stdout().flush().unwrap();
    }
}

impl<I: FftNum + NoteValue> Outputer<I> for LineLayout {
    fn setup(&mut self) {}
    fn handle_pnotes(&mut self, notes: &mut ProcerNotes<I>) {
        let notes_len = notes.0.len();
        let note_count = std::cmp::min(notes_len, self.notes_per_line);
        if notes.0[0..note_count].iter().all(|note| note.3 < notes.1) {
            if self.last_was_empty {
                return
            } else {
                self.last_was_empty = true;
            }
        } else {
            self.last_was_empty = false;
        }
        match self.use_colour {
            true => self.line_colour(note_count, notes),
            false => self.line_bw(note_count, notes)
        }
    }
}

impl TuiOutputer {
    pub fn new() -> Result<Self, std::io::Error> {
        let stdout = std::io::stdout();
        let backend = CrosstermBackend::new(stdout);
        let mut terminal = Terminal::new(backend)?;
        return Ok(Self {
            terminal,
        })
    }
}

impl<I: FftNum + NoteValue> Outputer<I> for TuiOutputer {
    fn setup(&mut self) {}
    fn handle_pnotes(&mut self, notes: &mut ProcerNotes<I>) {
        //self.terminal.draw(|frame| {})
    }
}


impl<I: FftNum + NoteValue> Outputer<I> for Outputers {
    fn setup(&mut self) {
        match self {
            Outputers::Simple(so) => <SimpleOutputer as Outputer<I>>::setup(so),
            Outputers::LineLayout(llo) => <LineLayout as Outputer<I>>::setup(llo),
            Outputers::Tui(to) => <TuiOutputer as Outputer<I>>::setup(to)
        }
    }

    fn handle_pnotes(&mut self, notes: &mut ProcerNotes<I>) {
        match self {
            Outputers::Simple(so) => so.handle_pnotes(notes),
            Outputers::LineLayout(llo) => llo.handle_pnotes(notes),
            Outputers::Tui(to) => to.handle_pnotes(notes),
        }
    }
}