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use std::fmt::Display;

use notation_core::prelude::EntryPassMode;
use serde::{Deserialize, Serialize};

use crate::prelude::Units;

#[derive(Copy, Clone, PartialEq, Serialize, Deserialize, Debug)]
pub struct TabPosition {
    pub in_tab_pos: Units,
}
impl Display for TabPosition {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "<TabPosition>({})", self.in_tab_pos.0)
    }
}
impl TabPosition {
    pub const ZERO: Self = Self {
        in_tab_pos: Units(0.0),
    };
    pub fn new(in_tab_pos: Units) -> Self {
        Self { in_tab_pos }
    }
}
impl From<TabPosition> for Units {
    fn from(v: TabPosition) -> Self {
        v.in_tab_pos
    }
}

#[derive(Copy, Clone, PartialEq, Serialize, Deserialize, Debug)]
pub struct BarPosition {
    pub bar_units: Units,
    pub bar_ordinal: usize,
    pub in_bar_pos: Units,
}
impl Display for BarPosition {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(
            f,
            "<BarPosition>({}:{})",
            self.bar_ordinal, self.in_bar_pos.0
        )
    }
}
impl From<BarPosition> for Units {
    fn from(v: BarPosition) -> Self {
        v.bar_pos() + v.in_bar_pos
    }
}
impl BarPosition {
    pub const ZERO: Self = Self {
        bar_units: Units(0.0),
        bar_ordinal: 0,
        in_bar_pos: Units(0.0),
    };
    pub fn new(bar_units: Units, bar_ordinal: usize, in_bar_pos: Units) -> Self {
        Self {
            bar_units,
            bar_ordinal,
            in_bar_pos,
        }
    }
    pub fn with_in_bar_pos(&self, in_bar_pos: Units) -> Self {
        Self::new(self.bar_units, self.bar_ordinal, in_bar_pos)
    }
    pub fn with_delay(&self, delay: Units) -> Self {
        Self::new(self.bar_units, self.bar_ordinal, self.in_bar_pos + delay)
    }
    pub fn bar_pos(&self) -> Units {
        Units(self.bar_ordinal as f32 * self.bar_units.0)
    }
}

#[derive(Copy, Clone, PartialEq, Serialize, Deserialize, Debug)]
pub struct Position {
    pub tab: TabPosition,
    pub bar: BarPosition,
}
impl Display for Position {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(
            f,
            "<Position>(tab:{}, bar:{}:{})",
            self.tab.in_tab_pos.0, self.bar.bar_ordinal, self.bar.in_bar_pos.0
        )
    }
}
impl From<Position> for Units {
    fn from(v: Position) -> Self {
        v.tab.in_tab_pos
    }
}

impl Position {
    pub fn new(bar_units: Units) -> Self {
        Self {
            tab: TabPosition::new(Units(0.0)),
            bar: BarPosition::new(bar_units, 0, Units(0.0)),
        }
    }
    pub fn calc_bar_ordinal(&self, pos: Units) -> usize {
        let bar = pos.0 / self.bar.bar_units.0;
        bar.trunc() as usize
    }
    pub fn cal_bar_pos(&self, bar_ordinal: usize) -> Units {
        Units(bar_ordinal as f32 * self.bar.bar_units.0)
    }
    pub fn set_in_tab(&mut self, pos: Units) {
        self.tab = TabPosition::new(pos);
        self.bar.bar_ordinal = self.calc_bar_ordinal(pos);
        self.bar.in_bar_pos = self.tab.in_tab_pos - self.cal_bar_pos(self.bar.bar_ordinal);
    }
    pub fn set_in_bar(&mut self, bar_ordinal: usize, in_bar_pos: Units) {
        self.tab = TabPosition::new(self.cal_bar_pos(bar_ordinal) + in_bar_pos);
        self.bar.bar_ordinal = bar_ordinal;
        self.bar.in_bar_pos = in_bar_pos;
    }
    pub fn _is_passed(&self, pass_mode: EntryPassMode, in_tab_pos: Units) -> bool {
        match pass_mode {
            EntryPassMode::Immediate => in_tab_pos.0 <= self.tab.in_tab_pos.0,
            EntryPassMode::Delayed => in_tab_pos.0 < self.tab.in_tab_pos.0,
        }
    }
    pub fn is_passed(&self, pass_mode: EntryPassMode, pos: &BarPosition) -> bool {
        let in_tab_pos = self.cal_bar_pos(pos.bar_ordinal) + pos.in_bar_pos;
        self._is_passed(pass_mode, in_tab_pos)
    }
    pub fn is_passed_with(
        &self,
        pass_mode: EntryPassMode,
        pos: &BarPosition,
        units: Units,
    ) -> bool {
        let in_tab_pos = self.cal_bar_pos(pos.bar_ordinal) + pos.in_bar_pos + units;
        self._is_passed(pass_mode, in_tab_pos)
    }
}

impl From<BarPosition> for TabPosition {
    fn from(v: BarPosition) -> Self {
        TabPosition::new(Units::from(v))
    }
}

impl From<BarPosition> for Position {
    fn from(v: BarPosition) -> Self {
        Position {
            tab: TabPosition::from(v),
            bar: v,
        }
    }
}