oxi-tui 0.8.1

//! Footer widget — 2줄 상태바: 모델/토큰/시간 + 경로/git

use ratatui::{
    buffer::Buffer,
    layout::{Alignment, Constraint, Direction, Layout, Rect},
    style::{Modifier, Style},
    text::{Line, Span},
    widgets::{Block, Borders, Paragraph, StatefulWidget},
};
use ratatui::widgets::Widget;
use crate::Theme;

/// Footer data — shared state for token counts and session info.
#[derive(Debug, Clone)]
pub struct FooterData {
    /// Active model name (full: "provider/model").
    pub model_name: String,
    /// Provider name.
    pub provider_name: String,
    /// Current git branch.
    pub git_branch: Option<String>,
    /// Git working tree dirty.
    pub git_dirty: bool,
    /// Current working directory.
    pub pwd: Option<String>,
    /// Input token count.
    pub input_tokens: u32,
    /// Output token count.
    pub output_tokens: u32,
    /// Cache read token count.
    pub cache_read_tokens: u32,
    /// Cache write token count.
    pub cache_write_tokens: u32,
    /// Context window usage percentage.
    pub context_window_pct: f32,
    /// Context window max tokens.
    pub context_window_max: u32,
    /// Current context tokens used.
    pub context_tokens: u32,
    /// Total session cost.
    pub total_cost: f64,
    /// Session duration in seconds.
    pub session_duration_secs: u64,
    /// Agent busy (streaming).
    pub is_busy: bool,
    /// Application version string.
    pub version: String,
}

impl Default for FooterData {
    fn default() -> Self {
        Self {
            model_name: String::new(),
            provider_name: String::new(),
            git_branch: None,
            git_dirty: false,
            pwd: None,
            input_tokens: 0,
            output_tokens: 0,
            cache_read_tokens: 0,
            cache_write_tokens: 0,
            context_window_pct: 0.0,
            context_window_max: 200_000,
            context_tokens: 0,
            total_cost: 0.0,
            session_duration_secs: 0,
            is_busy: false,
            version: String::new(),
        }
    }
}

impl FooterData {
    pub fn fmt_count(count: u32) -> String {
        if count < 1000 {
            count.to_string()
        } else if count < 1_000_000 {
            format!("{:.1}k", count as f32 / 1000.0)
        } else {
            format!("{:.1}M", count as f32 / 1_000_000.0)
        }
    }

    pub fn format_duration(secs: u64) -> String {
        if secs < 60 {
            format!("{}s", secs)
        } else if secs < 3600 {
            format!("{}m", secs / 60)
        } else {
            format!("{}h{}m", secs / 3600, (secs % 3600) / 60)
        }
    }
}

/// Footer state.
#[derive(Debug, Default)]
pub struct FooterState {
    pub data: FooterData,
}

/// Footer widget — 2줄 상태바.
pub struct Footer<'a> {
    theme: &'a Theme,
}

impl<'a> Footer<'a> {
    pub fn new(theme: &'a Theme) -> Self {
        Self { theme }
    }
}

impl Widget for Footer<'_> {
    fn render(self, area: Rect, buf: &mut Buffer) {
        let mut state = FooterState::default();
        StatefulWidget::render(self, area, buf, &mut state);
    }
}

impl StatefulWidget for Footer<'_> {
    type State = FooterState;

    fn render(self, area: Rect, buf: &mut Buffer, state: &mut Self::State) {
        if area.height < 2 || area.width < 4 {
            return;
        }

        let styles = self.theme.to_styles();
        let d = &state.data;

        // ── Split into 3 rows: separator, line 1, line 2 ──
        let rows = Layout::default()
            .direction(Direction::Vertical)
            .constraints([
                Constraint::Length(1), // separator
                Constraint::Length(1), // line 1: tokens/duration + model
                Constraint::Length(1), // line 2: path/git + version
            ])
            .split(area);

        // Row 0: separator line
        let separator = Block::default()
            .borders(Borders::TOP)
            .border_style(styles.border);
        separator.render(rows[0], buf);

        // ═══════════════════════════════════════════════════════
        // Row 1: left (tokens + duration) ... right (● model_name)
        // ═══════════════════════════════════════════════════════
        {
            // Build left-side content: tokens + duration
            let mut left_parts: Vec<String> = Vec::new();

            if d.input_tokens > 0 || d.output_tokens > 0 {
                let total = d.input_tokens + d.output_tokens
                    + d.cache_read_tokens + d.cache_write_tokens;
                if total > 0 && d.context_window_max > 0 {
                    let pct = (total as f32 / d.context_window_max as f32) * 100.0;
                    let max = FooterData::fmt_count(d.context_window_max);
                    left_parts.push(format!("{:.1}% / {}", pct, max));
                }
            }

            if d.session_duration_secs > 0 {
                left_parts.push(FooterData::format_duration(d.session_duration_secs));
            }

            let left_text = left_parts.join("  ");

            // Build right-side: ● model_name
            let model_short = if d.model_name.is_empty() {
                "[no model]".to_string()
            } else {
                d.model_name.split('/').last().unwrap_or(&d.model_name).to_string()
            };

            let indicator_color = if d.is_busy {
                self.theme.colors.accent.to_ratatui()
            } else {
                self.theme.colors.success.to_ratatui()
            };

            let right_span = Line::from(vec![
                Span::styled("●", Style::default().fg(indicator_color)),
                Span::styled(
                    format!(" {}", model_short),
                    Style::default()
                        .fg(self.theme.colors.primary.to_ratatui())
                        .add_modifier(Modifier::BOLD),
                ),
            ]);

            // Horizontal split for left/right
            let cols = Layout::default()
                .direction(Direction::Horizontal)
                .constraints([Constraint::Min(1), Constraint::Min(1)])
                .split(rows[1]);

            // Left: tokens + duration (muted, left-aligned)
            let left_para = Paragraph::new(Line::from(Span::styled(
                format!(" {}", left_text),
                styles.muted,
            )))
            .alignment(Alignment::Left);
            left_para.render(cols[0], buf);

            // Right: ● model_name (right-aligned)
            let right_para = Paragraph::new(right_span).alignment(Alignment::Right);
            right_para.render(cols[1], buf);
        }

        // ═══════════════════════════════════════════════════════
        // Row 2: left (path + git branch + status) ... right (version)
        // ═══════════════════════════════════════════════════════
        {
            // Build left spans: path + git branch + status
            let mut left_spans: Vec<Span> = Vec::new();

            // Path display: replace $HOME with ~
            let home = std::env::var("HOME").unwrap_or_default();
            let pwd_display = if let Some(ref pwd) = d.pwd {
                if !home.is_empty() && pwd.starts_with(&home) {
                    format!(" ~{}", &pwd[home.len()..])
                } else {
                    format!(" {}", pwd)
                }
            } else {
                String::new()
            };
            left_spans.push(Span::styled(pwd_display, styles.muted));

            // Git branch (accent), dirty marker, ✓/✗ status
            if let Some(ref branch) = d.git_branch {
                if !branch.is_empty() {
                    let dirty_marker = if d.git_dirty { "*" } else { "" };
                    left_spans.push(Span::styled(
                        format!(" ({}){}", branch, dirty_marker),
                        Style::default().fg(self.theme.colors.accent.to_ratatui()),
                    ));

                    let (status_char, status_style) = if d.git_dirty {
                        (" ✗", Style::default().fg(self.theme.colors.error.to_ratatui()))
                    } else {
                        (" ✓", Style::default().fg(self.theme.colors.success.to_ratatui()))
                    };
                    left_spans.push(Span::styled(status_char, status_style));
                }
            }

            // Version tag (muted, right-aligned)
            let version_tag = if !d.version.is_empty() {
                format!(" v{} ", d.version)
            } else {
                String::new()
            };

            let cols = Layout::default()
                .direction(Direction::Horizontal)
                .constraints([Constraint::Min(1), Constraint::Min(1)])
                .split(rows[2]);

            // Left: path + git
            let left_para = Paragraph::new(Line::from(left_spans))
                .alignment(Alignment::Left);
            left_para.render(cols[0], buf);

            // Right: version
            let right_para = Paragraph::new(Line::from(Span::styled(
                version_tag,
                Style::default().fg(self.theme.colors.muted.to_ratatui()),
            )))
            .alignment(Alignment::Right);
            right_para.render(cols[1], buf);
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn footer_data_default() {
        let data = FooterData::default();
        assert!(data.model_name.is_empty());
        assert_eq!(data.input_tokens, 0);
    }

    #[test]
    fn footer_data_format_duration() {
        assert_eq!(FooterData::format_duration(30), "30s");
        assert_eq!(FooterData::format_duration(90), "1m");
        assert_eq!(FooterData::format_duration(3661), "1h1m");
    }

    #[test]
    fn footer_data_fmt_count() {
        assert_eq!(FooterData::fmt_count(500), "500");
        assert_eq!(FooterData::fmt_count(1500), "1.5k");
        assert_eq!(FooterData::fmt_count(1_500_000), "1.5M");
    }
}