dbtui 0.1.4

Terminal database client with Vim-style navigation
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use ratatui::Frame;
use ratatui::layout::{Constraint, Rect};
use ratatui::style::{Modifier, Style};
use ratatui::text::Text;
use ratatui::widgets::{Block, Borders, Cell, Row, Table};

use crate::core::models::QueryResult;
use crate::ui::state::Mode;
use crate::ui::tabs::WorkspaceTab;
use crate::ui::theme::Theme;

pub fn render_for_tab(
    frame: &mut Frame,
    tab: &mut WorkspaceTab,
    focused: bool,
    theme: &Theme,
    area: Rect,
    mode: &Mode,
) {
    let is_table_view = matches!(tab.kind, crate::ui::tabs::TabKind::Table { .. });
    let grid_active = focused && (is_table_view || tab.grid_focused);
    let border_style = theme.border_style(grid_active, mode);

    if tab.query_result.is_none() {
        let block = Block::default()
            .title(" Data ")
            .borders(Borders::ALL)
            .border_style(border_style)
            .style(Style::default().bg(theme.editor_bg));
        let empty_rows: Vec<Row> = vec![];
        let empty = Table::new(empty_rows, &[Constraint::Min(1)]).block(block);
        frame.render_widget(empty, area);
        return;
    }

    let visible_height = area.height.saturating_sub(4) as usize;
    tab.grid_visible_height = visible_height.max(1);
    let available_width = area.width.saturating_sub(2) as usize;

    // Compute widths and scroll (mutable access to tab)
    let col_widths = compute_smart_widths(tab.query_result.as_ref().expect("checked"));
    ensure_col_visible(tab, &col_widths, available_width);

    // Now immutably borrow result for rendering
    let result = tab.query_result.as_ref().expect("checked");
    let total_rows = result.rows.len();
    let total_cols = result.columns.len();

    let scroll_col = tab.grid_scroll_col;

    // Determine which columns fit on screen starting from scroll_col
    let (vis_col_start, vis_col_end) = visible_col_range(&col_widths, scroll_col, available_width);

    // Selection range
    let sel_range: Option<((usize, usize), (usize, usize))> =
        tab.grid_selection_anchor.map(|(ar, ac)| {
            let cur = (tab.grid_selected_row, tab.grid_selected_col);
            let anchor = (ar, ac);
            if anchor <= cur {
                (anchor, cur)
            } else {
                (cur, anchor)
            }
        });

    let visual_tag = if tab.grid_visual_mode { " VISUAL " } else { "" };
    let col_info = if total_cols > vis_col_end - vis_col_start {
        format!(" cols {}-{}/{}", vis_col_start + 1, vis_col_end, total_cols)
    } else {
        String::new()
    };
    let status = format!(
        " Data [{}-{} of {}]{col_info} {visual_tag}",
        if total_rows > 0 {
            tab.grid_scroll_row + 1
        } else {
            0
        },
        (tab.grid_scroll_row + visible_height).min(total_rows),
        total_rows
    );

    let block = Block::default()
        .title(status)
        .borders(Borders::ALL)
        .border_style(border_style)
        .style(Style::default().bg(theme.editor_bg));

    // Build constraints for visible columns only
    let vis_constraints: Vec<Constraint> = col_widths[vis_col_start..vis_col_end]
        .iter()
        .map(|&w| Constraint::Min(w as u16))
        .collect();

    // Header (visible columns only)
    let header_cells: Vec<Cell> = result.columns[vis_col_start..vis_col_end]
        .iter()
        .map(|c| Cell::from(Text::from(c.as_str())).style(theme.grid_header_style()))
        .collect();
    let header = Row::new(header_cells)
        .height(1)
        .style(Style::default().bg(theme.grid_header_bg));

    let selected_col = tab.grid_selected_col;
    let is_grid_focused = grid_active;

    // Rows (visible columns only)
    let rows: Vec<Row> = result
        .rows
        .iter()
        .skip(tab.grid_scroll_row)
        .take(visible_height)
        .enumerate()
        .map(|(vis_idx, row_data)| {
            let absolute_idx = tab.grid_scroll_row + vis_idx;
            let row_style = theme.grid_row_style(absolute_idx);

            let cells: Vec<Cell> = (vis_col_start..vis_col_end)
                .map(|col_idx| {
                    let val = row_data.get(col_idx).map(|s| s.as_str()).unwrap_or("");
                    let base_style = if val == "NULL" {
                        theme.null_style()
                    } else if val.parse::<f64>().is_ok() {
                        Style::default().fg(theme.grid_number)
                    } else {
                        Style::default()
                    };

                    let is_cursor = is_grid_focused
                        && absolute_idx == tab.grid_selected_row
                        && col_idx == selected_col;

                    let in_selection = sel_range.is_some_and(|((sr, sc), (er, ec))| {
                        absolute_idx >= sr && absolute_idx <= er && col_idx >= sc && col_idx <= ec
                    });

                    if is_cursor {
                        Cell::from(Text::from(val)).style(
                            base_style
                                .bg(theme.grid_selected_bg)
                                .fg(theme.grid_selected_fg)
                                .add_modifier(Modifier::BOLD),
                        )
                    } else if in_selection {
                        Cell::from(Text::from(val)).style(
                            base_style
                                .bg(ratatui::style::Color::Rgb(40, 50, 70))
                                .fg(ratatui::style::Color::Rgb(200, 210, 230)),
                        )
                    } else {
                        Cell::from(Text::from(val)).style(base_style)
                    }
                })
                .collect();
            Row::new(cells).style(row_style)
        })
        .collect();

    let table = Table::new(rows, &vis_constraints)
        .header(header)
        .block(block)
        .column_spacing(1);

    frame.render_widget(table, area);
}

/// Compute column widths based on header + content (capped at 40)
fn compute_smart_widths(result: &QueryResult) -> Vec<usize> {
    let mut widths: Vec<usize> = result
        .columns
        .iter()
        .map(|c| c.len().max(4)) // min 4, start with header width
        .collect();

    // Sample first 100 rows to determine max content width
    for row in result.rows.iter().take(100) {
        for (i, val) in row.iter().enumerate() {
            if i < widths.len() {
                widths[i] = widths[i].max(val.len());
            }
        }
    }

    // Cap at 40 characters per column
    for w in &mut widths {
        *w = (*w).min(40);
    }

    widths
}

/// Ensure the selected column is visible by adjusting grid_scroll_col
fn ensure_col_visible(tab: &mut WorkspaceTab, col_widths: &[usize], available: usize) {
    let sel = tab.grid_selected_col;

    // If selected column is before scroll, scroll left
    if sel < tab.grid_scroll_col {
        tab.grid_scroll_col = sel;
        return;
    }

    // If selected column is past visible range, scroll right
    let mut used = 0;
    for (i, &w) in col_widths.iter().enumerate().skip(tab.grid_scroll_col) {
        used += w + 1; // +1 for column spacing
        if i == sel {
            if used > available {
                // Need to scroll right
                tab.grid_scroll_col = sel;
                // Try to show a few columns before too
                let mut back_used = 0;
                let mut new_start = sel;
                for j in (0..sel).rev() {
                    back_used += col_widths[j] + 1;
                    if back_used + col_widths[sel] + 1 > available {
                        break;
                    }
                    new_start = j;
                }
                tab.grid_scroll_col = new_start;
            }
            return;
        }
    }
}

/// Determine which columns are visible given scroll offset and available width
fn visible_col_range(col_widths: &[usize], scroll_col: usize, available: usize) -> (usize, usize) {
    let start = scroll_col.min(col_widths.len());
    let mut used = 0;
    let mut end = start;
    for &w in &col_widths[start..] {
        if used + w + 1 > available && end > start {
            break;
        }
        used += w + 1;
        end += 1;
    }
    (start, end)
}