1 files changed, 358 insertions, 0 deletions
diff --git a/src/widgets/sheetview/mod.rs b/src/widgets/sheetview/mod.rs
new file mode 100644
index 0000000..37e3d16
--- /dev/null
+++ b/src/widgets/sheetview/mod.rs
@@ -0,0 +1,358 @@
+use std::thread::JoinHandle;
+
+use ratatui::{
+    crossterm::event::{KeyCode, KeyEvent, KeyModifiers},
+    prelude::*,
+    style::Stylize,
+    text::ToLine,
+    widgets::{Block, Borders, Clear, Gauge, Paragraph, Widget, Wrap},
+};
+
+use crate::{config::GlobalConfig, sheet::{
+    eval::EvalFunction,
+    register::{Register, SheetId},
+    Sheet,
+}};
+
+use super::luaeditor::LuaEditor;
+
+const DEFAULT_COLUMN_WIDTH: u16 = 10;
+
+pub struct SheetView<'a> {
+    block: Block<'a>,
+    luaeditor: Option<LuaEditor<'a>>,
+    sheet: SheetId,
+    selection: Option<(u16, u16)>,
+    cursor: (u16, u16),
+    scroll: (u16, u16),
+    error_window: Option<String>,
+    process_handle: Option<JoinHandle<Result<Sheet, String>>>,
+}
+
+impl<'a> SheetView<'a> {
+    pub fn new(sheet: SheetId) -> Self {
+        Self {
+            block: Block::default()
+                .title_bottom(" Sheet ")
+                .title_style(Style::default().on_magenta().black())
+                .borders(Borders::BOTTOM)
+                .border_style(
+                    Style::default()
+                        .bg(Color::Rgb(29, 32, 33))
+                        .fg(Color::Rgb(29, 32, 33)),
+                ),
+            luaeditor: None,
+            sheet,
+            selection: None,
+            cursor: (0, 0),
+            scroll: (0, 0),
+            error_window: None,
+            process_handle: None,
+        }
+    }
+
+    pub fn sheet(mut self, sheet: SheetId) -> Self {
+        self.sheet = sheet;
+        self
+    }
+
+    pub fn move_cursor_by(&mut self, delta: (i32, i32)) {
+        let lock = Register::get(self.sheet).unwrap();
+        let sheet = lock.read().unwrap();
+
+        self.cursor.0 = ((self.cursor.0 as i32) + delta.0)
+            .max(0)
+            .min(sheet.height() as i32 - 1) as u16;
+        self.cursor.1 = ((self.cursor.1 as i32) + delta.1)
+            .max(0)
+            .min(sheet.width() as i32 - 1) as u16;
+    }
+
+    pub fn select_mode(&mut self, flag: bool) {
+        if flag {
+            self.selection = Some(self.cursor);
+        } else {
+            self.selection = None;
+        }
+    }
+
+    pub fn is_select_mode(&self) -> bool {
+        self.selection.is_some()
+    }
+
+    pub fn toggle_select_mode(&mut self) {
+        self.select_mode(!self.is_select_mode());
+    }
+
+    pub fn selection(&self) -> Vec<(u16, u16)> {
+        let mut selection = Vec::new();
+
+        if let Some((row, column)) = self.selection_range() {
+            for i in row.0..=row.1 {
+                for j in column.0..=column.1 {
+                    selection.push((i, j))
+                }
+            }
+        }
+
+        selection
+    }
+
+    fn is_in_selection(&mut self, row: u16, column: u16) -> bool {
+        if let Some((row_range, column_range)) = self.selection_range() {
+            row >= row_range.0
+                && row <= row_range.1
+                && column >= column_range.0
+                && column <= column_range.1
+        } else {
+            false
+        }
+    }
+
+    fn selection_range(&self) -> Option<((u16, u16), (u16, u16))> {
+        if let Some(selection) = self.selection {
+            let row = if selection.0 > self.cursor.0 {
+                (self.cursor.0, selection.0)
+            } else {
+                (selection.0, self.cursor.0)
+            };
+
+            let column = if selection.1 > self.cursor.1 {
+                (self.cursor.1, selection.1)
+            } else {
+                (selection.1, self.cursor.1)
+            };
+
+            Some((row, column))
+        } else {
+            None
+        }
+    }
+
+    fn join_process_handle_on_finished(&mut self) {
+        if let Some(handle) = self.process_handle.take() {
+            if handle.is_finished() {
+                match handle.join().unwrap() {
+                    Ok(sheet) => Register::get(self.sheet)
+                        .unwrap()
+                        .write()
+                        .unwrap()
+                        .apply(sheet),
+                    Err(message) => self.error_window = Some(message),
+                };
+                self.process_handle = None;
+            } else {
+                self.process_handle = Some(handle);
+            }
+        }
+    }
+
+    pub fn handle_key_event(&mut self, event: KeyEvent) {
+        if self.process_handle.is_some() {
+            self.join_process_handle_on_finished()
+        } else if let Some(_) = &self.error_window {
+            self.error_window = None;
+        } else if let Some(textarea) = &mut self.luaeditor {
+            match event.code {
+                KeyCode::Char('r') if event.modifiers == KeyModifiers::CONTROL => {
+                    let script = textarea.text();
+
+                    let (width, height) = {
+                        let lock = Register::get(self.sheet).unwrap();
+                        let sheet = lock.read().unwrap();
+                        (sheet.width(), sheet.height())
+                    };
+
+                    let mut cells = Vec::new();
+
+                    if let Some(_) = self.selection {
+                        cells = self
+                            .selection()
+                            .iter()
+                            .map(|(r, c)| (*r as usize, *c as usize))
+                            .collect()
+                    } else {
+                        for row in 0..height {
+                            for column in 0..width {
+                                cells.push((row, column));
+                            }
+                        }
+                    }
+
+                    self.process_handle = Some(
+                        Register::get(self.sheet)
+                            .unwrap()
+                            .eval_function(script, cells),
+                    );
+                }
+                KeyCode::Esc => {
+                    self.luaeditor = None;
+                }
+                _ => {
+                    textarea.handle_key_event(event);
+                }
+            }
+        } else {
+            match event.code {
+                KeyCode::Char('j') => self.move_cursor_by((1, 0)),
+                KeyCode::Char('k') => self.move_cursor_by((-1, 0)),
+                KeyCode::Char('h') => self.move_cursor_by((0, -1)),
+                KeyCode::Char('l') => self.move_cursor_by((0, 1)),
+                KeyCode::Char('v') => self.toggle_select_mode(),
+                KeyCode::Char('s') => {
+                    let editor = LuaEditor::new("function(cell)\n\treturn \"\"\nend");
+                    self.luaeditor = Some(editor)
+                }
+                _ => {}
+            }
+        }
+    }
+
+    fn areas(&self, area: Rect) -> (Rect, Rect, Rect, Rect) {
+        let mut sheet = area;
+        let mut editor = Rect::default();
+        let mut error = Rect::default();
+        let mut progress = Rect::default();
+
+        if self.luaeditor.is_some() {
+            let layout =
+                Layout::horizontal([Constraint::Min(1), Constraint::Length(50)]).split(sheet);
+            sheet = layout[0];
+            editor = layout[1];
+
+            if self.error_window.is_some() {
+                let layout =
+                    Layout::vertical([Constraint::Min(1), Constraint::Length(10)]).split(editor);
+                editor = layout[0];
+                error = layout[1];
+            }
+
+            if self.process_handle.is_some() {
+                let layout =
+                    Layout::vertical([Constraint::Min(1), Constraint::Length(1)]).split(editor);
+                editor = layout[0];
+                progress = layout[1];
+            }
+        }
+
+        (sheet, editor, error, progress)
+    }
+}
+
+impl Widget for &mut SheetView<'_> {
+    fn render(self, area: ratatui::prelude::Rect, buf: &mut ratatui::prelude::Buffer)
+    where
+        Self: Sized,
+    {
+        let theme = GlobalConfig::instance().theme.sheetview.clone();
+        let progress;
+        let (sheet_area, editor_area, error_area, progress_area) = self.areas(area);
+        let separator = Block::default().borders(Borders::RIGHT).border_style(
+            Style::default()
+                .bg(Color::Rgb(29, 32, 33))
+                .fg(Color::Rgb(29, 32, 33)),
+        );
+
+        {
+            let lock = Register::get(self.sheet).unwrap();
+            let sheet = lock.read().unwrap();
+
+            let mut sheet_area_inner = self.block.inner(sheet_area);
+
+            if self.luaeditor.is_some() {
+                sheet_area_inner = separator.inner(sheet_area_inner);
+            }
+
+            let viewport_rows = sheet.height().min(sheet_area.height as usize);
+            let viewport_columns = sheet
+                .width()
+                .min((sheet_area_inner.width / DEFAULT_COLUMN_WIDTH) as usize);
+
+            if self.cursor.0 >= viewport_rows as u16 + self.scroll.0 {
+                self.scroll.0 = self.cursor.0 - viewport_rows as u16 + 1;
+            } else if self.cursor.0 < self.scroll.0 {
+                self.scroll.0 = self.cursor.0;
+            }
+
+            if self.cursor.1 >= viewport_columns as u16 + self.scroll.1 {
+                self.scroll.1 = self.cursor.1 - viewport_columns as u16 + 1;
+            } else if self.cursor.1 < self.scroll.1 {
+                self.scroll.1 = self.cursor.1;
+            }
+
+            for row in 0..viewport_rows as u16 {
+                for column in 0..(viewport_columns + 1) as u16 {
+                    let (cell_pos_y, cell_pos_x) = (row + self.scroll.0, column + self.scroll.1);
+
+                    if let Some(cell) = sheet.get_cell(cell_pos_y as usize, cell_pos_x as usize) {
+                        let cell = cell.to_string() + " ";
+
+                        let line = if (cell_pos_y, cell_pos_x) == self.cursor {
+                            theme.cursor.apply(cell.to_line())
+                        } else if self.is_in_selection(cell_pos_y, cell_pos_x) {
+                            theme.selection.apply(cell.to_line())
+                        } else if (row + column) % 2 == 0 {
+                            theme.cell.0.apply(cell.to_line())
+                        } else {
+                            theme.cell.1.apply(cell.to_line())
+                        };
+
+                        let rect = Rect::new(
+                            sheet_area_inner.x + column * DEFAULT_COLUMN_WIDTH,
+                            sheet_area_inner.y + row,
+                            (sheet_area_inner.width - column * DEFAULT_COLUMN_WIDTH)
+                                .min(DEFAULT_COLUMN_WIDTH),
+                            1,
+                        );
+
+                        line.render(rect, buf);
+                    }
+                }
+            }
+
+            self.block.clone().render(sheet_area, buf);
+
+            if let Some(textarea) = &mut self.luaeditor {
+                separator.render(self.block.inner(sheet_area), buf);
+                textarea.render(editor_area, buf)
+            }
+
+            if let Some(error_msg) = &self.error_window {
+                let lines = error_msg.lines().collect::<Vec<_>>();
+
+                let block = Block::default()
+                    .title_bottom(" Error ")
+                    .title_style(Style::default().on_red())
+                    .border_style(Style::default().black().on_black())
+                    .borders(Borders::BOTTOM);
+                let error_inner = block.inner(error_area);
+                block.render(error_area, buf);
+
+                let text = Text::from_iter(lines.iter().map(|s| s.to_line().white()));
+
+                Paragraph::new(text)
+                    .wrap(Wrap { trim: true })
+                    .bg(Color::Rgb(70, 25, 25))
+                    .render(error_inner, buf);
+            }
+
+            progress = sheet.progress();
+        }
+
+        self.join_process_handle_on_finished();
+
+        if self.process_handle.is_some() {
+            let gauge = Gauge::default()
+                .gauge_style(
+                    Style::default()
+                        .fg(Color::White)
+                        .bg(Color::DarkGray)
+                        .add_modifier(Modifier::ITALIC),
+                )
+                .percent(progress as u16);
+
+            Clear::default().render(progress_area, buf);
+            gauge.render(progress_area, buf);
+        }
+    }
+}