use crossterm::event::{KeyCode, KeyEvent, KeyModifiers};
use ratatui::{
layout::{Constraint, Direction, Layout},
style::{Color, Modifier, Style},
text::{Line, Span, Text},
widgets::{Block, Borders, Paragraph, Wrap},
Frame,
};
use crate::db::types::ColumnSchema;
const NAME_W: usize = 20;
const BADGE_W: usize = 14;
pub enum EditFieldMode {
Navigate,
Editing,
}
pub enum EditRecordAction {
None,
Back,
Save(String),
}
pub struct EditRecordScreen {
pub table_name: String,
pub schema: Vec<ColumnSchema>,
pub original_values: Vec<String>,
pub current_values: Vec<String>,
pub selected_field: usize,
pub cursor_pos: usize,
pub mode: EditFieldMode,
pub scroll_offset: usize,
pub status: Option<String>,
}
impl EditRecordScreen {
pub fn new(table_name: String, schema: Vec<ColumnSchema>, values: Vec<String>) -> Self {
Self {
table_name,
original_values: values.clone(),
current_values: values,
schema,
selected_field: 0,
cursor_pos: 0,
mode: EditFieldMode::Navigate,
scroll_offset: 0,
status: None,
}
}
pub fn set_error(&mut self, msg: String) {
self.status = Some(format!("Error: {msg}"));
self.mode = EditFieldMode::Navigate;
}
pub fn handle_key(&mut self, key: KeyEvent) -> EditRecordAction {
match self.mode {
EditFieldMode::Navigate => self.handle_navigate(key),
EditFieldMode::Editing => self.handle_edit(key),
}
}
fn handle_navigate(&mut self, key: KeyEvent) -> EditRecordAction {
match key.code {
KeyCode::Char('q') | KeyCode::Esc => EditRecordAction::Back,
KeyCode::Char('j') | KeyCode::Down => {
self.move_field(1);
EditRecordAction::None
}
KeyCode::Char('k') | KeyCode::Up => {
self.move_field(-1);
EditRecordAction::None
}
KeyCode::Enter | KeyCode::Char('i') => {
if let Some(col) = self.schema.get(self.selected_field) {
if !col.is_pk {
self.cursor_pos = self.current_values[self.selected_field].chars().count();
self.mode = EditFieldMode::Editing;
self.status = None;
}
}
EditRecordAction::None
}
KeyCode::Char('s') if key.modifiers.contains(KeyModifiers::CONTROL) => {
let sql = self.build_update_sql();
if sql.starts_with("-- ") {
self.status = Some(sql);
EditRecordAction::None
} else {
EditRecordAction::Save(sql)
}
}
_ => EditRecordAction::None,
}
}
fn handle_edit(&mut self, key: KeyEvent) -> EditRecordAction {
match key.code {
KeyCode::Esc | KeyCode::Enter => {
self.mode = EditFieldMode::Navigate;
}
KeyCode::Left => {
if self.cursor_pos > 0 {
self.cursor_pos -= 1;
}
}
KeyCode::Right => {
let len = self.current_values[self.selected_field].chars().count();
if self.cursor_pos < len {
self.cursor_pos += 1;
}
}
KeyCode::Home => {
self.cursor_pos = 0;
}
KeyCode::End => {
self.cursor_pos = self.current_values[self.selected_field].chars().count();
}
KeyCode::Backspace => {
if self.cursor_pos > 0 {
let val = &mut self.current_values[self.selected_field];
let mut chars: Vec<char> = val.chars().collect();
chars.remove(self.cursor_pos - 1);
*val = chars.into_iter().collect();
self.cursor_pos -= 1;
}
}
KeyCode::Delete => {
let val = &mut self.current_values[self.selected_field];
let len = val.chars().count();
if self.cursor_pos < len {
let mut chars: Vec<char> = val.chars().collect();
chars.remove(self.cursor_pos);
*val = chars.into_iter().collect();
}
}
KeyCode::Char(c) if !key.modifiers.contains(KeyModifiers::CONTROL) => {
let val = &mut self.current_values[self.selected_field];
let mut chars: Vec<char> = val.chars().collect();
chars.insert(self.cursor_pos, c);
*val = chars.into_iter().collect();
self.cursor_pos += 1;
}
_ => {}
}
EditRecordAction::None
}
fn move_field(&mut self, delta: i64) {
let count = self.schema.len();
if count == 0 { return; }
let next = (self.selected_field as i64 + delta).clamp(0, count as i64 - 1) as usize;
self.selected_field = next;
}
pub fn build_update_sql(&self) -> String {
let Some(pk_idx) = self.schema.iter().position(|c| c.is_pk) else {
return "-- No primary key: cannot generate UPDATE".to_string();
};
let pk_col = &self.schema[pk_idx].name;
let pk_orig = &self.original_values[pk_idx];
let changes: Vec<String> = self.schema.iter()
.zip(self.current_values.iter())
.zip(self.original_values.iter())
.filter(|((col, cur), orig)| !col.is_pk && *cur != *orig)
.map(|((col, cur), _)| {
format!("\"{}\" = {}", col.name, sql_literal(cur, &col.type_name))
})
.collect();
if changes.is_empty() {
return "-- No changes".to_string();
}
format!(
"UPDATE \"{}\" SET {} WHERE \"{}\" = {}",
self.table_name,
changes.join(", "),
pk_col,
sql_literal(pk_orig, &self.schema[pk_idx].type_name)
)
}
pub fn draw(f: &mut Frame<'_>, screen: &mut EditRecordScreen) {
let area = f.size();
let chunks = Layout::default()
.direction(Direction::Vertical)
.constraints([
Constraint::Min(0), Constraint::Length(4), Constraint::Length(3), ])
.split(area);
let visible_rows = (chunks[0].height as usize).saturating_sub(2);
if screen.selected_field < screen.scroll_offset {
screen.scroll_offset = screen.selected_field;
} else if screen.selected_field >= screen.scroll_offset + visible_rows && visible_rows > 0 {
screen.scroll_offset = screen.selected_field - visible_rows + 1;
}
let val_w = (chunks[0].width as usize).saturating_sub(2 + NAME_W + BADGE_W);
let mut lines: Vec<Line> = vec![];
let end = (screen.scroll_offset + visible_rows).min(screen.schema.len());
for i in screen.scroll_offset..end {
let col = &screen.schema[i];
let is_sel = i == screen.selected_field;
let is_editing = is_sel && matches!(screen.mode, EditFieldMode::Editing);
let cur_val = &screen.current_values[i];
let orig_val = &screen.original_values[i];
let changed = cur_val != orig_val && !col.is_pk;
let sel_str = if is_sel { "> " } else { " " };
let name_str = format!("{:<width$}", col.name, width = NAME_W - 2);
let (badge_str, badge_style) = if col.is_pk {
(
format!("{:<BADGE_W$}", "[PK]"),
Style::default().fg(Color::Cyan),
)
} else if let Some(ref fk) = col.fk {
let max_t = BADGE_W.saturating_sub(4);
let t = if fk.table.len() > max_t { &fk.table[..max_t] } else { &fk.table };
(
format!("[→{:<width$}]", t, width = BADGE_W - 3),
Style::default().fg(Color::Magenta),
)
} else {
(
format!("{:<BADGE_W$}", ""),
Style::default(),
)
};
let display_val = if cur_val.chars().count() > val_w && val_w > 0 {
let s: String = cur_val.chars().take(val_w.saturating_sub(1)).collect();
format!("{s}…")
} else {
cur_val.clone()
};
let name_style = if col.is_pk {
Style::default().fg(Color::DarkGray)
} else if is_sel {
Style::default().fg(Color::Yellow).add_modifier(Modifier::BOLD)
} else if changed {
Style::default().fg(Color::Green)
} else {
Style::default()
};
let val_style = if col.is_pk {
Style::default().fg(Color::DarkGray)
} else if is_editing {
Style::default().fg(Color::White).bg(Color::DarkGray)
} else if is_sel {
Style::default().fg(Color::White).add_modifier(Modifier::BOLD)
} else if cur_val == "NULL" {
Style::default().fg(Color::DarkGray)
} else if changed {
Style::default().fg(Color::Green)
} else {
Style::default()
};
lines.push(Line::from(vec![
Span::styled(format!("{sel_str}{name_str}"), name_style),
Span::styled(badge_str, badge_style),
Span::styled(display_val, val_style),
]));
}
let title_suffix = screen.status.as_deref()
.map(|s| format!(" — {s}"))
.unwrap_or_default();
let title = format!(" Edit: {}{} ", screen.table_name, title_suffix);
f.render_widget(
Paragraph::new(Text::from(lines))
.block(
Block::default()
.borders(Borders::ALL)
.title(title)
.title_style(Style::default().fg(Color::Cyan).add_modifier(Modifier::BOLD)),
),
chunks[0],
);
if matches!(screen.mode, EditFieldMode::Editing) {
let field_row = screen.selected_field.saturating_sub(screen.scroll_offset);
let visible_cursor = screen.cursor_pos.min(val_w);
let cursor_x = chunks[0].x + 1 + (NAME_W + BADGE_W) as u16 + visible_cursor as u16;
let cursor_y = chunks[0].y + 1 + field_row as u16;
if cursor_y < chunks[0].y + chunks[0].height.saturating_sub(1) {
f.set_cursor(cursor_x, cursor_y);
}
}
let sql = screen.build_update_sql();
let sql_style = if sql.starts_with("-- ") {
Style::default().fg(Color::DarkGray)
} else {
Style::default().fg(Color::Green)
};
f.render_widget(
Paragraph::new(sql.as_str())
.block(Block::default().borders(Borders::ALL).title(" SQL Preview "))
.style(sql_style)
.wrap(Wrap { trim: false }),
chunks[1],
);
let help = if matches!(screen.mode, EditFieldMode::Editing) {
" ← →: cursor Backspace/Del: delete Enter/Esc: done"
} else {
" j/k: field Enter/i: edit Ctrl+S: save Esc: back"
};
f.render_widget(
Paragraph::new(help)
.block(Block::default().borders(Borders::ALL))
.style(Style::default().fg(Color::DarkGray)),
chunks[2],
);
}
}
fn sql_literal(val: &str, type_name: &str) -> String {
if val == "NULL" {
return "NULL".to_string();
}
let tn = type_name.to_uppercase();
let is_num = tn.contains("INT") || tn.contains("FLOAT") || tn.contains("REAL")
|| tn.contains("NUMERIC") || tn.contains("DECIMAL") || tn.contains("DOUBLE")
|| tn.contains("NUMBER");
if is_num && val.parse::<f64>().is_ok() {
val.to_string()
} else {
format!("'{}'", val.replace('\'', "''"))
}
}