sqlly-datatable 1.0.2

//! `GridState` plus all non-paint behaviour: input, scrollbars, drag,
//! sort/filter, scrolling, hit-testing, edge-scroll coordination, filter-prompt
//! cursor handling.

use crate::compare_cells;
use crate::data::{CellValue, GridData};
use crate::format::{cell_matches_filter, format_cell};
use crate::grid::state::state_inner::apply_edge_scroll;
use crate::grid::theme::GridTheme;

use crate::config::{GridConfig, ResolvedColumnFormat};
use gpui::{px, App, Bounds, FocusHandle, Keystroke, MouseButton, Pixels, Point, ScrollHandle};

// Pull selection / menu types into scope unqualified for this module's impl.
use crate::grid::menu as menu_mod;
#[allow(unused_imports)]
pub(crate) use crate::grid::menu::{ContextMenu, MenuAction, MenuItem};
use crate::grid::selection::{
    screen_to_content, HitResult, ScrollbarAxis, Selection, SortDirection,
};

/// Inline constructor / state mutators used by the widget's render loop.
/// Kept in its own submodule so this module remains the public surface while
/// its helpers are exposed for unit tests.
pub mod state_inner {
    use super::{
        format_cell, CellValue, GridState, HitResult, Pixels, Point, ResolvedColumnFormat,
    };
    pub use crate::grid::selection::screen_to_content;
    use std::fmt::Write as _;

    /// Returns the per-tick edge-scroll velocity in pixels (positive scrolls
    /// the content forward; the caller applies sign).
    pub fn edge_scroll_speed(dist_from_edge: f32) -> f32 {
        if dist_from_edge > 150.0 {
            return 0.0;
        }
        if dist_from_edge < 0.0 {
            return (24.0 + (-dist_from_edge) * 0.6).min(80.0);
        }
        if dist_from_edge < 25.0 {
            12.0
        } else if dist_from_edge < 50.0 {
            6.0
        } else if dist_from_edge < 100.0 {
            3.0
        } else {
            1.0
        }
    }

    pub fn apply_edge_scroll(state: &mut GridState) -> bool {
        if !state.is_dragging {
            return false;
        }
        let Some(pos) = state.last_mouse_pos else {
            return false;
        };
        let bounds = state.bounds;
        let (x, y) = screen_to_content(pos, bounds.origin, state.scroll_handle.offset());
        let vw: f32 = bounds.size.width.into();
        let vh: f32 = bounds.size.height.into();
        let right_dist = vw - x;
        let left_dist = x - state.row_header_width;
        let bottom_dist = vh - y;
        let top_dist = y - state.header_height;
        let mut dx = 0.0_f32;
        let mut dy = 0.0_f32;
        if right_dist < 150.0 && right_dist <= left_dist {
            dx = edge_scroll_speed(right_dist);
        } else if left_dist < 150.0 {
            dx = -edge_scroll_speed(left_dist);
        }
        if bottom_dist < 150.0 && bottom_dist <= top_dist {
            dy = edge_scroll_speed(bottom_dist);
        } else if top_dist < 150.0 {
            dy = -edge_scroll_speed(top_dist);
        }
        if dx == 0.0 && dy == 0.0 {
            return false;
        }
        state.scroll_one_edge_tick(dx, dy);
        if state.drag_start.is_some() {
            state.update_drag_from_last();
        }
        true
    }

    #[must_use]
    pub fn format_current_status(state: &GridState) -> String {
        let scroll = state.scroll_handle.offset();
        let (click_col, click_row) = col_row_from_hit(state.click_hit);
        let (hover_col, hover_row) = col_row_from_hit(state.hover_hit);
        let mut out = String::new();
        let _ = write!(
            out,
            "Click: {}  Scroll@Click: {}  Cell: {}  |  Cur: {}  Scroll: {}  Over: {}",
            fmt_point(state.click_pos),
            fmt_point(state.scroll_at_click),
            fmt_cr(click_col, click_row),
            fmt_point(state.last_mouse_pos),
            fmt_point(Some(scroll)),
            fmt_cr(hover_col, hover_row),
        );
        out
    }

    fn col_row_from_hit(hit: Option<HitResult>) -> (Option<usize>, Option<usize>) {
        match hit {
            Some(HitResult::Cell(r, c)) => (Some(c), Some(r)),
            Some(HitResult::RowHeader(r)) => (None, Some(r)),
            Some(HitResult::ColumnHeader(c)) | Some(HitResult::SortButton(c)) => (Some(c), None),
            _ => (None, None),
        }
    }

    fn fmt_point(p: Option<Point<Pixels>>) -> String {
        match p {
            Some(p) => format!("({:.0}, {:.0})", f32::from(p.x), f32::from(p.y)),
            None => "—".into(),
        }
    }

    fn fmt_cr(c: Option<usize>, r: Option<usize>) -> String {
        match (c, r) {
            (Some(c), Some(r)) => format!("(col {c}, row {r})"),
            (Some(c), None) => format!("(col {c})"),
            (None, Some(r)) => format!("(row {r})"),
            (None, None) => "—".into(),
        }
    }

    #[must_use]
    pub fn cell_text(cell: &CellValue, fmt: &ResolvedColumnFormat) -> String {
        format_cell(cell, fmt).0
    }
}

/// Width, in pixels, of vertical and horizontal scrollbar strips.
pub const SCROLLBAR_SIZE: f32 = 20.0;
/// Polling interval used to drive auto-scroll during drag.
pub const EDGE_SCROLL_TICK_MS: u64 = 16;

/// Complete grid state owned by a GPUI `Entity<GridState>`.
#[derive(Debug)]
pub struct GridState {
    pub data: GridData,
    pub config: GridConfig,
    /// Cached resolved-format list, kept in sync with `data.columns` and
    /// `config`. Paint, copy, and filter read this directly instead of
    /// recomputing per cell.
    pub resolved_formats: Vec<ResolvedColumnFormat>,
    pub display_indices: Vec<usize>,
    pub selection: Selection,
    pub sort: Option<(usize, SortDirection)>,
    pub filters: Vec<String>,
    pub scroll_handle: ScrollHandle,
    pub focus_handle: FocusHandle,
    pub bounds: Bounds<Pixels>,
    pub row_height: f32,
    pub header_height: f32,
    pub row_header_width: f32,
    pub font_size: f32,
    pub char_width: f32,
    pub theme: GridTheme,
    pub is_dragging: bool,
    pub drag_start: Option<Point<Pixels>>,
    pub drag_start_hit: Option<HitResult>,
    pub scroll_at_click: Option<Point<Pixels>>,
    pub last_mouse_pos: Option<Point<Pixels>>,
    pub status_bar_height: f32,
    pub click_pos: Option<Point<Pixels>>,
    pub click_hit: Option<HitResult>,
    pub hover_hit: Option<HitResult>,
    pub resizing_col: Option<usize>,
    pub resize_start_x: f32,
    pub resize_start_width: f32,
    pub context_menu: Option<ContextMenu>,
    pub filter_prompt: Option<FilterPrompt>,
    pub pending_action: Option<(MenuAction, usize)>,
    pub scrollbar_drag: Option<ScrollbarAxis>,
    pub scrollbar_drag_start_offset: f32,
    pub scrollbar_drag_start_pos: f32,
}

/// Filter-prompt input. Cursor is tracked as a **char count**, not a byte
/// offset, so multi-byte input never panics on grapheme-misaligned inserts.
#[derive(Clone, Debug)]
pub struct FilterPrompt {
    pub col: usize,
    pub anchor: Point<Pixels>,
    pub input: String,
    pub cursor_chars: usize,
}

impl FilterPrompt {
    fn new(col: usize, anchor: Point<Pixels>, input: String) -> Self {
        let cursor_chars = input.chars().count();
        Self {
            col,
            anchor,
            input,
            cursor_chars,
        }
    }

    fn clamp_cursor(&mut self) {
        let total = self.input.chars().count();
        if self.cursor_chars > total {
            self.cursor_chars = total;
        }
    }

    fn insert_char(&mut self, ch: char) {
        let byte_idx = byte_index_for_char(&self.input, self.cursor_chars);
        self.input.insert(byte_idx, ch);
        self.cursor_chars += 1;
    }

    fn backspace(&mut self) {
        if self.cursor_chars == 0 {
            return;
        }
        let end = byte_index_for_char(&self.input, self.cursor_chars);
        let start = byte_index_for_char(&self.input, self.cursor_chars - 1);
        self.input.replace_range(start..end, "");
        self.cursor_chars -= 1;
    }
}

fn byte_index_for_char(input: &str, char_idx: usize) -> usize {
    input
        .char_indices()
        .nth(char_idx)
        .map_or(input.len(), |(idx, _)| idx)
}

impl GridState {
    #[must_use]
    pub fn new(data: GridData, config: GridConfig, focus_handle: FocusHandle) -> Self {
        let resolved_formats = config.resolve_all(&data.columns);
        let col_count = data.columns.len();
        let display_indices = (0..data.rows.len()).collect();
        Self {
            data,
            config,
            resolved_formats,
            display_indices,
            selection: Selection::None,
            sort: None,
            filters: vec![String::new(); col_count],
            scroll_handle: ScrollHandle::new(),
            focus_handle,
            bounds: Bounds::default(),
            row_height: 24.0,
            header_height: 32.0,
            row_header_width: 50.0,
            font_size: 14.0,
            char_width: 7.6,
            theme: GridTheme::default(),
            is_dragging: false,
            drag_start: None,
            drag_start_hit: None,
            scroll_at_click: None,
            last_mouse_pos: None,
            status_bar_height: 24.0,
            click_pos: None,
            click_hit: None,
            hover_hit: None,
            resizing_col: None,
            resize_start_x: 0.0,
            resize_start_width: 0.0,
            context_menu: None,
            filter_prompt: None,
            pending_action: None,
            scrollbar_drag: None,
            scrollbar_drag_start_offset: 0.0,
            scrollbar_drag_start_pos: 0.0,
        }
    }

    pub fn set_config(&mut self, config: GridConfig) {
        self.config = config;
        self.rebuild_resolved_formats();
        self.recompute();
    }

    fn rebuild_resolved_formats(&mut self) {
        self.resolved_formats = self.config.resolve_all(&self.data.columns);
    }

    pub fn recompute(&mut self) {
        let mut indices: Vec<usize> = (0..self.data.rows.len())
            .filter(|&row_idx| {
                self.data.columns.iter().enumerate().all(|(col_idx, _col)| {
                    let filter = &self.filters[col_idx];
                    if filter.is_empty() {
                        return true;
                    }
                    let cell = &self.data.rows[row_idx][col_idx];
                    cell_matches_filter(cell, &self.resolved_formats[col_idx], filter)
                })
            })
            .collect();

        if let Some((sort_col, direction)) = self.sort {
            indices.sort_by(|&a, &b| {
                let cell_a = &self.data.rows[a][sort_col];
                let cell_b = &self.data.rows[b][sort_col];
                let ord = compare_cells(cell_a, cell_b);
                match direction {
                    SortDirection::Ascending => ord,
                    SortDirection::Descending => ord.reverse(),
                }
            });
        }
        self.display_indices = indices;
    }

    fn content_size(&self) -> (f32, f32) {
        let cw: f32 = self.data.columns.iter().map(|c| c.width).sum();
        let ch = self.display_indices.len() as f32 * self.row_height;
        (cw, ch)
    }

    pub(crate) fn max_scroll(&self) -> (f32, f32) {
        let (cw, ch) = self.content_size();
        let (rw, rh) = self.scrollbar_reserved();
        let vw: f32 = self.bounds.size.width.into();
        let vh: f32 = self.bounds.size.height.into();
        let vw = vw - self.row_header_width - rw;
        let vh = vh - self.header_height - rh;
        ((cw - vw).max(0.0), (ch - vh).max(0.0))
    }

    fn scrollbar_reserved(&self) -> (f32, f32) {
        let (cw, ch) = self.content_size();
        let vw: f32 = self.bounds.size.width.into();
        let vh: f32 = self.bounds.size.height.into();
        let vw = vw - self.row_header_width;
        let vh = vh - self.header_height;
        let reserved_w = if ch > vh { SCROLLBAR_SIZE } else { 0.0 };
        let reserved_h = if cw > vw { SCROLLBAR_SIZE } else { 0.0 };
        (reserved_w, reserved_h)
    }

    fn vbar_geom(&self) -> Option<(f32, f32, f32, f32, f32)> {
        let (_, ch) = self.content_size();
        let (_, rh) = self.scrollbar_reserved();
        let vh: f32 = self.bounds.size.height.into();
        let vh = vh - self.header_height - rh;
        if ch <= vh {
            return None;
        }
        let ox: f32 = self.bounds.origin.x.into();
        let oy: f32 = self.bounds.origin.y.into();
        let sw: f32 = self.bounds.size.width.into();
        let sh: f32 = self.bounds.size.height.into();
        let track_x = ox + sw - SCROLLBAR_SIZE;
        let track_y = oy + self.header_height;
        let track_h = sh - self.header_height - rh;
        let thumb_h = ((track_h * (vh / ch)).max(20.0)).min(track_h);
        Some((track_x, track_y, SCROLLBAR_SIZE, track_h, thumb_h))
    }

    fn hbar_geom(&self) -> Option<(f32, f32, f32, f32, f32)> {
        let (cw, _) = self.content_size();
        let (rw, _) = self.scrollbar_reserved();
        let vw: f32 = self.bounds.size.width.into();
        let vw = vw - self.row_header_width - rw;
        if cw <= vw {
            return None;
        }
        let ox: f32 = self.bounds.origin.x.into();
        let oy: f32 = self.bounds.origin.y.into();
        let sw: f32 = self.bounds.size.width.into();
        let sh: f32 = self.bounds.size.height.into();
        let track_x = ox + self.row_header_width;
        let track_y = oy + sh - SCROLLBAR_SIZE;
        let track_w = sw - self.row_header_width - rw;
        let thumb_w = ((track_w * (vw / cw)).max(20.0)).min(track_w);
        Some((track_x, track_y, track_w, SCROLLBAR_SIZE, thumb_w))
    }

    pub(crate) fn scroll_to_vbar(&mut self, mouse_y: f32) {
        if let Some((_, track_y, _, track_h, thumb_h)) = self.vbar_geom() {
            let (_, max_y) = self.max_scroll();
            let range = (track_h - thumb_h).max(0.0);
            let rel = (mouse_y - track_y - thumb_h * 0.5).clamp(0.0, range);
            let frac = if range > 0.0 { rel / range } else { 0.0 };
            let new_y = frac * max_y;
            let x = self.scroll_handle.offset().x;
            self.scroll_handle.set_offset(Point { x, y: px(new_y) });
        }
    }

    pub(crate) fn scroll_to_hbar(&mut self, mouse_x: f32) {
        if let Some((track_x, _, track_w, _, thumb_w)) = self.hbar_geom() {
            let (max_x, _) = self.max_scroll();
            let range = (track_w - thumb_w).max(0.0);
            let rel = (mouse_x - track_x - thumb_w * 0.5).clamp(0.0, range);
            let frac = if range > 0.0 { rel / range } else { 0.0 };
            let new_x = frac * max_x;
            let y = self.scroll_handle.offset().y;
            self.scroll_handle.set_offset(Point { x: px(new_x), y });
        }
    }

    pub(crate) fn scroll_one_edge_tick(&mut self, dx: f32, dy: f32) {
        let (mx, my) = self.max_scroll();
        let s = self.scroll_handle.offset();
        let new_x: f32 = (f32::from(s.x) + dx).clamp(0.0, mx);
        let new_y: f32 = (f32::from(s.y) + dy).clamp(0.0, my);
        self.scroll_handle.set_offset(Point {
            x: px(new_x),
            y: px(new_y),
        });
    }

    pub fn toggle_sort(&mut self, col: usize) {
        self.sort = match self.sort {
            Some((c, SortDirection::Ascending)) if c == col => {
                Some((col, SortDirection::Descending))
            }
            Some((c, SortDirection::Descending)) if c == col => None,
            _ => Some((col, SortDirection::Ascending)),
        };
        self.recompute();
    }

    pub fn handle_mouse_down(&mut self, pos: Point<Pixels>, shift: bool) {
        let hit = self.hit_test(pos);
        self.click_pos = Some(pos);
        self.click_hit = Some(hit);
        match hit {
            HitResult::VerticalScrollbar => {
                self.scrollbar_drag = Some(ScrollbarAxis::Vertical);
                self.scroll_to_vbar(f32::from(pos.y));
                self.clear_drag();
            }
            HitResult::HorizontalScrollbar => {
                self.scrollbar_drag = Some(ScrollbarAxis::Horizontal);
                self.scroll_to_hbar(f32::from(pos.x));
                self.clear_drag();
            }
            HitResult::ColumnBorder(col) => {
                self.resizing_col = Some(col);
                self.resize_start_x = f32::from(pos.x);
                self.resize_start_width = self.data.columns[col].width;
                self.clear_drag();
            }
            HitResult::ColumnHeader(col) => {
                self.selection = Selection::Column(col);
                self.clear_drag();
            }
            HitResult::SortButton(col) => {
                self.selection = Selection::Column(col);
                self.toggle_sort(col);
                self.clear_drag();
            }
            HitResult::ContextMenuItem(_) => {}
            HitResult::RowHeader(row) => {
                self.selection = if shift {
                    if let Selection::Row(prev) = self.selection {
                        let (s, e) = (prev, row);
                        Selection::RowRange(s.min(e), s.max(e))
                    } else {
                        Selection::Row(row)
                    }
                } else {
                    Selection::Row(row)
                };
                self.start_drag(pos);
                self.drag_start_hit = Some(HitResult::RowHeader(row));
            }
            HitResult::Cell(row, col) => {
                self.selection = if shift {
                    if let Selection::Cell(pr, pc) = self.selection {
                        Selection::CellRange(pr.min(row), pc.min(col), pr.max(row), pc.max(col))
                    } else {
                        Selection::Cell(row, col)
                    }
                } else {
                    Selection::Cell(row, col)
                };
                self.start_drag(pos);
                self.drag_start_hit = Some(HitResult::Cell(row, col));
            }
            HitResult::Corner | HitResult::None => {
                self.selection = Selection::None;
                self.context_menu = None;
                self.filter_prompt = None;
                self.clear_drag();
            }
        }
    }

    fn start_drag(&mut self, pos: Point<Pixels>) {
        self.is_dragging = false;
        self.drag_start = Some(pos);
        self.scroll_at_click = Some(self.scroll_handle.offset());
        self.last_mouse_pos = Some(pos);
    }

    pub(crate) fn open_context_menu(&mut self, col: usize, anchor: Point<Pixels>) {
        self.context_menu = Some(menu_mod::ContextMenu::standard(col, anchor));
        self.filter_prompt = None;
    }

    pub fn execute_action(&mut self, action: MenuAction, col: usize, cx: &mut App) {
        match action {
            MenuAction::SelectColumn => {
                self.selection = Selection::Column(col);
            }
            MenuAction::CopyColumn => {
                let text = self.column_text(col);
                cx.write_to_clipboard(gpui::ClipboardItem::new_string(text));
            }
            MenuAction::CopyColumnWithHeaders => {
                let mut text = String::new();
                text.push_str(&self.data.columns[col].name);
                text.push('\n');
                text.push_str(&self.column_text(col));
                cx.write_to_clipboard(gpui::ClipboardItem::new_string(text));
            }
            MenuAction::SortAscending => {
                self.sort = Some((col, SortDirection::Ascending));
                self.recompute();
            }
            MenuAction::SortDescending => {
                self.sort = Some((col, SortDirection::Descending));
                self.recompute();
            }
            MenuAction::ClearSort => {
                self.sort = None;
                self.recompute();
            }
            MenuAction::FilterPrompt => {
                let anchor = self.last_mouse_pos.unwrap_or(Point {
                    x: px(0.0),
                    y: px(0.0),
                });
                let existing = self.filters.get(col).cloned().unwrap_or_default();
                self.filter_prompt = Some(FilterPrompt::new(col, anchor, existing));
            }
            MenuAction::ClearFilter => {
                if col < self.filters.len() {
                    self.filters[col].clear();
                    self.recompute();
                }
            }
        }
        self.context_menu = None;
    }

    fn column_text(&self, col: usize) -> String {
        let mut text = String::new();
        let fmt = &self.resolved_formats[col];
        for &row_idx in &self.display_indices {
            let cell = &self.data.rows[row_idx][col];
            let (s, _) = format_cell(cell, fmt);
            text.push_str(&s);
            text.push('\n');
        }
        text
    }

    fn clear_drag(&mut self) {
        self.is_dragging = false;
        self.drag_start = None;
        self.drag_start_hit = None;
        self.scroll_at_click = None;
    }

    fn drag_world_corners(&self) -> Option<(Point<Pixels>, Point<Pixels>)> {
        let start = self.drag_start?;
        let mouse = self.last_mouse_pos?;
        let click_scroll = self
            .scroll_at_click
            .unwrap_or_else(|| self.scroll_handle.offset());
        let scroll = self.scroll_handle.offset();
        let sx_click: f32 = click_scroll.x.into();
        let sy_click: f32 = click_scroll.y.into();
        let sx: f32 = scroll.x.into();
        let sy: f32 = scroll.y.into();
        let sx0: f32 = start.x.into();
        let sy0: f32 = start.y.into();
        let mx: f32 = mouse.x.into();
        let my: f32 = mouse.y.into();
        let start_world = Point {
            x: px(sx0 + sx_click),
            y: px(sy0 + sy_click),
        };
        let end_world = Point {
            x: px(mx + sx),
            y: px(my + sy),
        };
        Some((start_world, end_world))
    }

    pub fn drag_screen_rect(&self) -> Option<(Point<Pixels>, Point<Pixels>)> {
        if !self.is_dragging {
            return None;
        }
        let (start_world, end_world) = self.drag_world_corners()?;
        let scroll = self.scroll_handle.offset();
        let sx: f32 = scroll.x.into();
        let sy: f32 = scroll.y.into();
        let start_screen = Point {
            x: px(f32::from(start_world.x) - sx),
            y: px(f32::from(start_world.y) - sy),
        };
        let end_screen = Point {
            x: px(f32::from(end_world.x) - sx),
            y: px(f32::from(end_world.y) - sy),
        };
        Some((start_screen, end_screen))
    }

    fn update_drag(&mut self) {
        let (start_world, end_world) = match self.drag_world_corners() {
            Some(c) => c,
            None => return,
        };
        if !self.is_dragging {
            let dx = f32::from(end_world.x) - f32::from(start_world.x);
            let dy = f32::from(end_world.y) - f32::from(start_world.y);
            if dx * dx + dy * dy <= 400.0 {
                return;
            }
            self.is_dragging = true;
        }
        let r1 = match self.drag_start_hit {
            Some(h) => h,
            None => return,
        };
        let ox: f32 = self.bounds.origin.x.into();
        let oy: f32 = self.bounds.origin.y.into();
        let r2 = self.hit_test_content(
            f32::from(end_world.x) - ox,
            f32::from(end_world.y) - oy,
            0.0,
            0.0,
        );
        match (r1, r2) {
            (HitResult::Cell(r1c, c1), HitResult::Cell(r2c, c2)) => {
                self.selection =
                    Selection::CellRange(r1c.min(r2c), c1.min(c2), r1c.max(r2c), c1.max(c2));
            }
            (HitResult::RowHeader(r1r), HitResult::RowHeader(r2r)) => {
                self.selection = Selection::RowRange(r1r.min(r2r), r1r.max(r2r));
            }
            _ => {}
        }
    }

    fn update_drag_from_last(&mut self) {
        self.update_drag();
    }

    pub fn handle_mouse_move(&mut self, pos: Point<Pixels>, pressed_button: Option<MouseButton>) {
        if self.is_dragging && pressed_button != Some(MouseButton::Left) {
            self.handle_mouse_up();
            return;
        }
        if let Some(col) = self.resizing_col {
            if pressed_button != Some(MouseButton::Left) {
                self.resizing_col = None;
                return;
            }
            let new_w =
                (self.resize_start_width + (f32::from(pos.x) - self.resize_start_x)).max(40.0);
            self.data.columns[col].width = new_w;
            return;
        }
        if let Some(axis) = self.scrollbar_drag {
            if pressed_button != Some(MouseButton::Left) {
                self.scrollbar_drag = None;
                return;
            }
            match axis {
                ScrollbarAxis::Vertical => self.scroll_to_vbar(f32::from(pos.y)),
                ScrollbarAxis::Horizontal => self.scroll_to_hbar(f32::from(pos.x)),
            }
            self.last_mouse_pos = Some(pos);
            return;
        }
        self.last_mouse_pos = Some(pos);
        if let Some(menu) = self.context_menu.clone() {
            let cw = self.char_width;
            let (x_rel, y_rel) =
                screen_to_content(pos, self.bounds.origin, self.scroll_handle.offset());
            let hovered = menu_mod::hover_at(&menu, x_rel, y_rel, cw);
            if let Some(menu_mut) = self.context_menu.as_mut() {
                menu_mut.hovered = hovered;
            }
            self.hover_hit = Some(self.hit_test(pos));
            return;
        }
        self.hover_hit = Some(self.hit_test(pos));
        if self.drag_start.is_none() {
            return;
        }
        self.update_drag();
    }

    pub fn handle_scroll_drag(&mut self) {
        if self.drag_start.is_some() && self.last_mouse_pos.is_some() {
            self.update_drag();
        }
    }

    pub fn handle_mouse_up(&mut self) {
        self.resizing_col = None;
        self.scrollbar_drag = None;
        self.clear_drag();
    }

    pub fn apply_edge_scroll(&mut self) -> bool {
        apply_edge_scroll(self)
    }

    pub fn select_all(&mut self) {
        let nrows = self.display_indices.len();
        let ncols = self.data.columns.len();
        if nrows > 0 && ncols > 0 {
            self.selection = Selection::CellRange(0, 0, nrows - 1, ncols - 1);
        }
    }

    pub fn copy_selection(&self, with_headers: bool, cx: &mut App) {
        let Some((raw_r1, raw_c1, raw_r2, raw_c2)) = self.selection.normalized_bounds() else {
            return;
        };
        if self.display_indices.is_empty() || self.data.columns.is_empty() {
            return;
        }
        let last_row = self.display_indices.len() - 1;
        let last_col = self.data.columns.len() - 1;
        let r1 = raw_r1.min(last_row);
        let r2 = raw_r2.min(last_row);
        let c1 = raw_c1.min(last_col);
        let c2 = raw_c2.min(last_col);
        let mut text = String::new();
        if with_headers {
            for c in c1..=c2 {
                if c > c1 {
                    text.push('\t');
                }
                text.push_str(&self.data.columns[c].name);
            }
            text.push('\n');
        }
        for dr in r1..=r2 {
            let row_idx = self.display_indices[dr];
            for c in c1..=c2 {
                if c > c1 {
                    text.push('\t');
                }
                let cell = &self.data.rows[row_idx][c];
                let (s, _) = format_cell(cell, &self.resolved_formats[c]);
                text.push_str(&s);
            }
            text.push('\n');
        }
        cx.write_to_clipboard(gpui::ClipboardItem::new_string(text));
    }

    pub fn page_up(&mut self) {
        let vh: f32 = self.bounds.size.height.into();
        let rows = ((vh - self.header_height) / self.row_height) as i32;
        self.move_selection(0, -rows);
    }

    pub fn page_down(&mut self) {
        let vh: f32 = self.bounds.size.height.into();
        let rows = ((vh - self.header_height) / self.row_height) as i32;
        self.move_selection(0, rows);
    }

    pub fn handle_key(&mut self, keystroke: &Keystroke) {
        if let Some(prompt) = &mut self.filter_prompt {
            match keystroke.key.as_str() {
                "escape" => self.filter_prompt = None,
                "enter" => {
                    let col = prompt.col;
                    self.filters[col] = prompt.input.clone();
                    self.filter_prompt = None;
                    self.recompute();
                }
                "backspace" => prompt.backspace(),
                "left" => {
                    if prompt.cursor_chars > 0 {
                        prompt.cursor_chars -= 1;
                    }
                }
                "right" => {
                    prompt.clamp_cursor();
                    if prompt.cursor_chars < prompt.input.chars().count() {
                        prompt.cursor_chars += 1;
                    }
                }
                _ => {
                    if let Some(ch) = keystroke_to_char(keystroke) {
                        prompt.insert_char(ch);
                    }
                }
            }
            return;
        }
        if self.context_menu.is_some() {
            if keystroke.key.as_str() == "escape" {
                self.context_menu = None;
            }
            return;
        }
        match keystroke.key.as_str() {
            "up" => self.move_selection(0, -1),
            "down" => self.move_selection(0, 1),
            "left" => self.move_selection(-1, 0),
            "right" => self.move_selection(1, 0),
            "escape" => self.selection = Selection::None,
            _ => {}
        }
    }

    fn move_selection(&mut self, dx: i32, dy: i32) {
        let nrows = self.display_indices.len() as i32;
        let ncols = self.data.columns.len() as i32;
        if nrows == 0 || ncols == 0 {
            return;
        }
        let last_row = nrows - 1;
        let last_col = ncols - 1;
        match self.selection {
            Selection::Cell(row, col) => {
                let nr = (row as i32 + dy).clamp(0, last_row) as usize;
                let nc = (col as i32 + dx).clamp(0, last_col) as usize;
                self.selection = Selection::Cell(nr, nc);
            }
            Selection::Row(row) if dy != 0 => {
                let nr = (row as i32 + dy).clamp(0, last_row) as usize;
                self.selection = Selection::Row(nr);
            }
            Selection::Column(col) if dx != 0 => {
                let nc = (col as i32 + dx).clamp(0, last_col) as usize;
                self.selection = Selection::Column(nc);
            }
            _ => self.selection = Selection::Cell(0, 0),
        }
    }

    pub(crate) fn hit_test(&self, pos: Point<Pixels>) -> HitResult {
        let bounds = self.bounds;
        let (sx, sy) = (
            f32::from(self.scroll_handle.offset().x),
            f32::from(self.scroll_handle.offset().y),
        );
        let bw: f32 = bounds.size.width.into();
        let bh: f32 = bounds.size.height.into();
        let (mx, my) = self.max_scroll();
        if let Some(menu) = &self.context_menu {
            let cw = self.char_width;
            let (x_rel, y_rel) = screen_to_content(pos, bounds.origin, self.scroll_handle.offset());
            if let Some(idx) = menu_mod::hover_at(menu, x_rel, y_rel, cw) {
                return HitResult::ContextMenuItem(idx);
            }
        }
        if my > 0.0
            && f32::from(pos.x) >= bw - SCROLLBAR_SIZE
            && f32::from(pos.y) >= self.header_height
        {
            return HitResult::VerticalScrollbar;
        }
        if mx > 0.0
            && f32::from(pos.y) >= bh - SCROLLBAR_SIZE
            && f32::from(pos.x) >= self.row_header_width
        {
            return HitResult::HorizontalScrollbar;
        }
        let (cx, cy) = screen_to_content(pos, bounds.origin, self.scroll_handle.offset());
        if cx < 0.0 || cy < 0.0 || cx > bw || cy > bh {
            return HitResult::None;
        }
        self.hit_test_content(cx, cy, sx, sy)
    }

    fn hit_test_content(&self, x: f32, y: f32, sx: f32, sy: f32) -> HitResult {
        if y < self.header_height {
            if x < self.row_header_width {
                return HitResult::Corner;
            }
            let col_x = x - self.row_header_width + sx;
            let mut acc = 0.0;
            for (i, col) in self.data.columns.iter().enumerate() {
                let right = acc + col.width;
                if i + 1 < self.data.columns.len() && col_x >= right - 5.0 && col_x <= right + 5.0 {
                    return HitResult::ColumnBorder(i);
                }
                if col_x >= acc && col_x < right {
                    if col_x >= right - 20.0 {
                        return HitResult::SortButton(i);
                    }
                    return HitResult::ColumnHeader(i);
                }
                acc = right;
            }
            return HitResult::None;
        }
        if x < self.row_header_width {
            let row_y = y - self.header_height + sy;
            if row_y < 0.0 {
                return HitResult::None;
            }
            let row_idx = (row_y / self.row_height) as usize;
            if row_idx < self.display_indices.len() {
                return HitResult::RowHeader(row_idx);
            }
            return HitResult::None;
        }
        let col_x = x - self.row_header_width + sx;
        let row_y = y - self.header_height + sy;
        if row_y < 0.0 {
            return HitResult::None;
        }
        let row_idx = (row_y / self.row_height) as usize;
        if row_idx >= self.display_indices.len() {
            return HitResult::None;
        }
        let mut acc = 0.0;
        for (i, col) in self.data.columns.iter().enumerate() {
            if col_x >= acc && col_x < acc + col.width {
                return HitResult::Cell(row_idx, i);
            }
            acc += col.width;
        }
        HitResult::None
    }

    #[must_use]
    pub fn wants_edge_scroll_tick(&self) -> bool {
        self.is_dragging
    }
}

fn keystroke_to_char(k: &Keystroke) -> Option<char> {
    if k.modifiers.control || k.modifiers.platform || k.modifiers.alt {
        return None;
    }
    if let Some(key_char) = k.key_char.as_ref() {
        return key_char.chars().next();
    }
    if k.key.chars().count() == 1 {
        let c = k.key.chars().next()?;
        if k.modifiers.shift {
            Some(c.to_ascii_uppercase())
        } else {
            Some(c)
        }
    } else {
        None
    }
}

#[cfg(test)]
#[allow(
    clippy::unwrap_used,
    clippy::expect_used,
    clippy::field_reassign_with_default
)]
mod tests {
    use super::*;
    use crate::data::{CellValue, Column, ColumnKind};
    use crate::grid::state::state_inner::{edge_scroll_speed, format_current_status};

    fn anchor() -> Point<Pixels> {
        Point {
            x: px(0.0),
            y: px(0.0),
        }
    }

    fn prompt_with(text: &str, cursor: usize) -> FilterPrompt {
        let mut p = FilterPrompt::new(0, anchor(), text.to_owned());
        p.cursor_chars = cursor;
        p
    }

    #[test]
    fn filter_prompt_new_cursors_at_char_count_not_bytes() {
        // "hé🙂" is 3 chars but 7 bytes (h=1, é=2, 🙂=4).
        let p = FilterPrompt::new(0, anchor(), "hé🙂".into());
        assert_eq!(p.cursor_chars, 3);
        assert_eq!(p.input.len(), 7);
    }

    #[test]
    fn filter_prompt_insert_emoji_at_start_does_not_panic() {
        let mut p = prompt_with("ab", 0);
        p.insert_char('\u{1F600}');
        assert_eq!(p.input, "\u{1F600}ab");
        assert_eq!(p.cursor_chars, 1);
    }

    #[test]
    fn filter_prompt_insert_in_middle_keeps_cursor_at_char_position() {
        let mut p = prompt_with("helloworld", 5);
        p.insert_char(' ');
        assert_eq!(p.input, "hello world");
        assert_eq!(p.cursor_chars, 6);
    }

    #[test]
    fn filter_prompt_backspace_at_zero_is_noop() {
        let mut p = prompt_with("abc", 0);
        p.backspace();
        assert_eq!(p.input, "abc");
        assert_eq!(p.cursor_chars, 0);
    }

    #[test]
    fn filter_prompt_backspace_removes_one_char_value() {
        // Cursor sits after "hé" (2 chars); backspace should delete "é" only.
        let mut p = prompt_with("héx", 2);
        p.backspace();
        assert_eq!(p.input, "hx");
        assert_eq!(p.cursor_chars, 1);
    }

    #[test]
    fn filter_prompt_clamp_cursor_pulls_back_past_end() {
        let mut p = prompt_with("abc", 99);
        p.clamp_cursor();
        assert_eq!(p.cursor_chars, 3);
    }

    #[test]
    fn edge_scroll_speed_stops_outside_band() {
        assert_eq!(edge_scroll_speed(200.0), 0.0);
        assert_eq!(edge_scroll_speed(-100.0), 80.0); // clamps at cap
        assert_eq!(edge_scroll_speed(0.0), 12.0); // < 25
        assert_eq!(edge_scroll_speed(24.99), 12.0);
        assert_eq!(edge_scroll_speed(25.0), 6.0); // < 50
        assert_eq!(edge_scroll_speed(49.99), 6.0);
        assert_eq!(edge_scroll_speed(50.0), 3.0); // < 100
        assert_eq!(edge_scroll_speed(99.99), 3.0);
        assert_eq!(edge_scroll_speed(100.0), 1.0); // < 150
        assert_eq!(edge_scroll_speed(149.99), 1.0);
    }

    #[test]
    fn edge_scroll_speed_caps_negative_runaway() {
        // -1000 should saturate to (24 + 600).min(80) = 80.
        assert_eq!(edge_scroll_speed(-1000.0), 80.0);
    }

    /// `GridState` requires a real GPUI `FocusHandle` from
    /// `gpui::Application`, but `gpui::Application::new()` panics on any
    /// thread other than `main`. Since Rust's test runner executes on a
    /// worker pool, the GPUI-backed assertions cannot run alongside pure
    /// tests. We mark this test `#[ignore]` so `cargo test` stays green; run
    /// it with `cargo test -- --ignored grid_state_behavior_under_application`
    /// from the workspace root on the test thread observable to GPUI.
    #[allow(clippy::expect_used, clippy::unwrap_used)]
    #[test]
    #[ignore = "requires gpui::Application which must run on the OS main thread; can only be executed under a custom main harness"]
    fn grid_state_behavior_under_application() {
        gpui::Application::new().run(|cx| {
            let focus = cx.focus_handle();

            // format_current_status_handles_initial_state
            let mut state = GridState::new(
                GridData::new(
                    vec![Column::new("n", ColumnKind::Integer, 100.0)],
                    vec![vec![CellValue::Integer(1)]],
                )
                .expect("rectangular"),
                crate::config::GridConfig::default(),
                focus.clone(),
            );
            let _ = format_current_status(&state);
            assert_eq!(state.selection, Selection::None);

            // format_current_status_replaces_with_supplied_pos
            state.last_mouse_pos = Some(Point {
                x: px(120.0),
                y: px(80.0),
            });
            let s = format_current_status(&state);
            assert!(s.contains("(120, 80)"), "missing positional, got: {s}");

            // recompute_filters_then_sorts_then_clears
            let mut state = GridState::new(
                GridData::new(
                    vec![Column::new("name", ColumnKind::Text, 100.0)],
                    vec![
                        vec![CellValue::Text("alpha".into())],
                        vec![CellValue::Text("beta".into())],
                        vec![CellValue::Text("gamma".into())],
                    ],
                )
                .expect("rectangular"),
                crate::config::GridConfig::default(),
                focus.clone(),
            );
            state.filters[0] = "a".into();
            state.toggle_sort(0);
            state.recompute();
            assert_eq!(state.display_indices, vec![0, 2]);
            state.toggle_sort(0);
            state.recompute();
            assert_eq!(state.display_indices, vec![2, 0]);
            state.filters[0].clear();
            state.toggle_sort(0);
            state.recompute();
            assert_eq!(state.display_indices, vec![0, 1, 2]);

            // toggle_sort_cycles_through_three_states
            let mut state = GridState::new(
                GridData::new(
                    vec![Column::new("v", ColumnKind::Integer, 80.0)],
                    vec![vec![CellValue::Integer(1)]],
                )
                .expect("rectangular"),
                crate::config::GridConfig::default(),
                focus.clone(),
            );
            state.toggle_sort(0);
            assert_eq!(state.sort, Some((0, SortDirection::Ascending)));
            state.toggle_sort(0);
            assert_eq!(state.sort, Some((0, SortDirection::Descending)));
            state.toggle_sort(0);
            assert_eq!(state.sort, None);

            // select_all_picks_full_range_when_data_present
            let mut state = GridState::new(
                GridData::new(
                    vec![
                        Column::new("a", ColumnKind::Integer, 80.0),
                        Column::new("b", ColumnKind::Integer, 80.0),
                    ],
                    vec![vec![CellValue::Integer(1), CellValue::Integer(2)]],
                )
                .expect("rectangular"),
                crate::config::GridConfig::default(),
                focus.clone(),
            );
            state.select_all();
            assert_eq!(state.selection, Selection::CellRange(0, 0, 0, 1));

            // select_all_is_noop_on_empty
            let mut state = GridState::new(
                GridData::new(vec![Column::new("a", ColumnKind::Integer, 80.0)], vec![])
                    .expect("rectangular"),
                crate::config::GridConfig::default(),
                focus.clone(),
            );
            state.select_all();
            assert_eq!(state.selection, Selection::None);

            // set_config_refreshes_resolved_formats
            let mut state = GridState::new(
                GridData::new(
                    vec![Column::new("v", ColumnKind::Decimal, 100.0)],
                    vec![vec![CellValue::Decimal(1.234)]],
                )
                .expect("rectangular"),
                crate::config::GridConfig::default(),
                focus.clone(),
            );
            assert_eq!(state.resolved_formats[0].number.decimals, 2);
            let mut cfg = crate::config::GridConfig::default();
            cfg.column_overrides = vec![crate::config::ColumnOverride {
                number: Some(crate::config::NumberFormat {
                    decimals: 6,
                    ..Default::default()
                }),
                ..Default::default()
            }];
            state.set_config(cfg);
            assert_eq!(state.resolved_formats[0].number.decimals, 6);

            // wants_edge_scroll_tick_mirrors_is_dragging
            let mut state = GridState::new(
                GridData::new(
                    vec![Column::new("a", ColumnKind::Integer, 80.0)],
                    vec![vec![CellValue::Integer(1)]],
                )
                .expect("rectangular"),
                crate::config::GridConfig::default(),
                focus.clone(),
            );
            assert!(!state.wants_edge_scroll_tick());
            state.is_dragging = true;
            assert!(state.wants_edge_scroll_tick());

            cx.quit();
        });
    }
}