use crate::theme;
use ratatui::buffer::Buffer;
use ratatui::layout::Rect;
use ratatui::widgets::Widget;

#[derive(Clone, Copy, PartialEq, Eq)]
pub enum MuteStatus {
    Normal,
    Muted,
    Soloed,
    EffectivelyMuted, // Solo active on another pattern
}

pub struct ActivePatterns<'a> {
    patterns: &'a [(usize, usize, usize)], // (bank, pattern, iter)
    mute_status: Option<&'a [MuteStatus]>,
    current_step: Option<(usize, usize)>,  // (current_step, total_steps)
}

impl<'a> ActivePatterns<'a> {
    pub fn new(patterns: &'a [(usize, usize, usize)]) -> Self {
        Self {
            patterns,
            mute_status: None,
            current_step: None,
        }
    }

    pub fn with_step(mut self, current: usize, total: usize) -> Self {
        self.current_step = Some((current, total));
        self
    }

    pub fn with_mute_status(mut self, status: &'a [MuteStatus]) -> Self {
        self.mute_status = Some(status);
        self
    }
}

impl Widget for ActivePatterns<'_> {
    fn render(self, area: Rect, buf: &mut Buffer) {
        if area.width < 10 || area.height == 0 {
            return;
        }
        let theme = theme::get();

        let max_pattern_rows = if self.current_step.is_some() {
            area.height.saturating_sub(1) as usize
        } else {
            area.height as usize
        };

        for (row, &(bank, pattern, iter)) in self.patterns.iter().enumerate() {
            if row >= max_pattern_rows {
                break;
            }

            let mute_status = self
                .mute_status
                .and_then(|s| s.get(row))
                .copied()
                .unwrap_or(MuteStatus::Normal);

            let (prefix, fg, bg) = match mute_status {
                MuteStatus::Soloed => ("S", theme.list.soloed_fg, theme.list.soloed_bg),
                MuteStatus::Muted => ("M", theme.list.muted_fg, theme.list.muted_bg),
                MuteStatus::EffectivelyMuted => (" ", theme.list.muted_fg, theme.list.muted_bg),
                MuteStatus::Normal => {
                    let bg = if row % 2 == 0 {
                        theme.table.row_even
                    } else {
                        theme.table.row_odd
                    };
                    (" ", theme.ui.text_primary, bg)
                }
            };

            let text = format!("{}B{:02}:{:02}({:02})", prefix, bank + 1, pattern + 1, iter.min(99));
            let y = area.y + row as u16;

            let mut chars = text.chars();
            for col in 0..area.width as usize {
                let ch = chars.next().unwrap_or(' ');
                buf[(area.x + col as u16, y)]
                    .set_char(ch)
                    .set_fg(fg)
                    .set_bg(bg);
            }
        }

        if let Some((current, total)) = self.current_step {
            let text = format!("{:02}/{:02}", current + 1, total);
            let y = area.y + area.height.saturating_sub(1);
            let mut chars = text.chars();
            for col in 0..area.width as usize {
                let ch = chars.next().unwrap_or(' ');
                buf[(area.x + col as u16, y)]
                    .set_char(ch)
                    .set_fg(theme.ui.text_primary)
                    .set_bg(theme.table.row_even);
            }
        }
    }
}