use serde::{Deserialize, Serialize};

use crate::config::{DEFAULT_LENGTH, MAX_BANKS, MAX_PATTERNS, MAX_STEPS};

#[derive(Clone, Copy, Serialize, Deserialize, Default, PartialEq)]
pub enum PatternSpeed {
    Eighth,  // 1/8x
    Quarter, // 1/4x
    Half,    // 1/2x
    #[default]
    Normal, // 1x
    Double,  // 2x
    Quad,    // 4x
    Octo,    // 8x
}

impl PatternSpeed {
    pub fn multiplier(&self) -> f64 {
        match self {
            Self::Eighth => 0.125,
            Self::Quarter => 0.25,
            Self::Half => 0.5,
            Self::Normal => 1.0,
            Self::Double => 2.0,
            Self::Quad => 4.0,
            Self::Octo => 8.0,
        }
    }

    pub fn label(&self) -> &'static str {
        match self {
            Self::Eighth => "1/8x",
            Self::Quarter => "1/4x",
            Self::Half => "1/2x",
            Self::Normal => "1x",
            Self::Double => "2x",
            Self::Quad => "4x",
            Self::Octo => "8x",
        }
    }

    pub fn next(&self) -> Self {
        match self {
            Self::Eighth => Self::Quarter,
            Self::Quarter => Self::Half,
            Self::Half => Self::Normal,
            Self::Normal => Self::Double,
            Self::Double => Self::Quad,
            Self::Quad => Self::Octo,
            Self::Octo => Self::Octo,
        }
    }

    pub fn prev(&self) -> Self {
        match self {
            Self::Eighth => Self::Eighth,
            Self::Quarter => Self::Eighth,
            Self::Half => Self::Quarter,
            Self::Normal => Self::Half,
            Self::Double => Self::Normal,
            Self::Quad => Self::Double,
            Self::Octo => Self::Quad,
        }
    }

    pub fn from_label(s: &str) -> Option<Self> {
        match s.trim() {
            "1/8x" | "1/8" | "0.125x" => Some(Self::Eighth),
            "1/4x" | "1/4" | "0.25x" => Some(Self::Quarter),
            "1/2x" | "1/2" | "0.5x" => Some(Self::Half),
            "1x" | "1" => Some(Self::Normal),
            "2x" | "2" => Some(Self::Double),
            "4x" | "4" => Some(Self::Quad),
            "8x" | "8" => Some(Self::Octo),
            _ => None,
        }
    }
}

#[derive(Clone, Serialize, Deserialize)]
pub struct Step {
    pub active: bool,
    pub script: String,
    #[serde(skip)]
    pub command: Option<String>,
}

impl Default for Step {
    fn default() -> Self {
        Self {
            active: true,
            script: String::new(),
            command: None,
        }
    }
}

#[derive(Clone, Serialize, Deserialize)]
pub struct Pattern {
    pub steps: Vec<Step>,
    pub length: usize,
    #[serde(default)]
    pub speed: PatternSpeed,
    #[serde(default)]
    pub name: Option<String>,
}

impl Default for Pattern {
    fn default() -> Self {
        Self {
            steps: (0..MAX_STEPS).map(|_| Step::default()).collect(),
            length: DEFAULT_LENGTH,
            speed: PatternSpeed::default(),
            name: None,
        }
    }
}

impl Pattern {
    pub fn step(&self, index: usize) -> Option<&Step> {
        self.steps.get(index)
    }

    pub fn step_mut(&mut self, index: usize) -> Option<&mut Step> {
        self.steps.get_mut(index)
    }

    pub fn set_length(&mut self, length: usize) {
        let length = length.clamp(2, MAX_STEPS);
        while self.steps.len() < length {
            self.steps.push(Step::default());
        }
        self.length = length;
    }
}

#[derive(Clone, Serialize, Deserialize)]
pub struct Bank {
    pub patterns: Vec<Pattern>,
    #[serde(default)]
    pub name: Option<String>,
}

impl Default for Bank {
    fn default() -> Self {
        Self {
            patterns: (0..MAX_PATTERNS).map(|_| Pattern::default()).collect(),
            name: None,
        }
    }
}

#[derive(Clone, Serialize, Deserialize)]
pub struct Project {
    pub banks: Vec<Bank>,
}

impl Default for Project {
    fn default() -> Self {
        Self {
            banks: (0..MAX_BANKS).map(|_| Bank::default()).collect(),
        }
    }
}

impl Project {
    pub fn pattern_at(&self, bank: usize, pattern: usize) -> &Pattern {
        &self.banks[bank].patterns[pattern]
    }

    pub fn pattern_at_mut(&mut self, bank: usize, pattern: usize) -> &mut Pattern {
        &mut self.banks[bank].patterns[pattern]
    }
}