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use crate::event::Outcome;
use crate::{FTableState, TableSelection};
use rat_event::{ct_event, FocusKeys, HandleEvent, MouseOnly};
use ratatui::layout::Position;
use std::cmp::max;

/// Doesn't do any selection for the table.
///
/// But it implements scrolling via mouse and keyboard.
#[derive(Debug, Default, Clone)]
pub struct NoSelection;

impl TableSelection for NoSelection {
    fn is_selected_row(&self, _row: usize) -> bool {
        false
    }

    fn is_selected_column(&self, _column: usize) -> bool {
        false
    }

    fn is_selected_cell(&self, _column: usize, _row: usize) -> bool {
        false
    }

    fn lead_selection(&self) -> Option<(usize, usize)> {
        None
    }
}

impl HandleEvent<crossterm::event::Event, FocusKeys, Outcome> for FTableState<NoSelection> {
    fn handle(&mut self, event: &crossterm::event::Event, _keymap: FocusKeys) -> Outcome {
        let res = match event {
            ct_event!(keycode press Down) => self.scroll_down(1).into(),
            ct_event!(keycode press Up) => self.scroll_up(1).into(),
            ct_event!(keycode press CONTROL-Down) | ct_event!(keycode press End) => {
                self.set_vertical_offset(self.max_row_offset).into()
            }
            ct_event!(keycode press CONTROL-Up) | ct_event!(keycode press Home) => {
                self.set_vertical_offset(0).into()
            }
            ct_event!(keycode press PageUp) => self
                .scroll_up(self.vertical_page().saturating_sub(1))
                .into(),
            ct_event!(keycode press PageDown) => self
                .scroll_down(self.vertical_page().saturating_sub(1))
                .into(),
            ct_event!(keycode press Right) => self.scroll_right(1).into(),
            ct_event!(keycode press Left) => self.scroll_left(1).into(),
            ct_event!(keycode press CONTROL-Right) | ct_event!(keycode press SHIFT-End) => {
                self.set_horizontal_offset(self.max_col_offset).into()
            }
            ct_event!(keycode press CONTROL-Left) | ct_event!(keycode press SHIFT-Home) => {
                self.set_horizontal_offset(0).into()
            }
            _ => Outcome::NotUsed,
        };

        if res == Outcome::NotUsed {
            self.handle(event, MouseOnly)
        } else {
            res
        }
    }
}

impl HandleEvent<crossterm::event::Event, MouseOnly, Outcome> for FTableState<NoSelection> {
    fn handle(&mut self, event: &crossterm::event::Event, _keymap: MouseOnly) -> Outcome {
        match event {
            ct_event!(scroll down for column,row) => {
                if self.area.contains(Position::new(*column, *row)) {
                    self.scroll_down(max(self.row_page_len / 10, 1)).into()
                } else {
                    Outcome::NotUsed
                }
            }
            ct_event!(scroll up for column, row) => {
                if self.area.contains(Position::new(*column, *row)) {
                    self.scroll_up(max(self.row_page_len / 10, 1)).into()
                } else {
                    Outcome::NotUsed
                }
            }
            ct_event!(scroll ALT down for column,row) => {
                if self.area.contains(Position::new(*column, *row)) {
                    self.scroll_right(1).into()
                } else {
                    Outcome::NotUsed
                }
            }
            ct_event!(scroll ALT up for column, row) => {
                if self.area.contains(Position::new(*column, *row)) {
                    self.scroll_left(1).into()
                } else {
                    Outcome::NotUsed
                }
            }
            _ => Outcome::NotUsed,
        }
    }
}

/// Handle all events.
/// Table events are only processed if focus is true.
/// Mouse events are processed if they are in range.
pub fn handle_events(
    state: &mut FTableState<NoSelection>,
    focus: bool,
    event: &crossterm::event::Event,
) -> Outcome {
    if focus {
        state.handle(event, FocusKeys)
    } else {
        state.handle(event, MouseOnly)
    }
}

/// Handle only mouse-events.
pub fn handle_mouse_events(
    state: &mut FTableState<NoSelection>,
    event: &crossterm::event::Event,
) -> Outcome {
    state.handle(event, MouseOnly)
}