use crate::prelude::*;
use super::*;
pub struct LauncherGridView<'a> {
    state:     &'a Launcher,
    buf:       &'a mut Buffer,
    area:      Rect,
    focused:   bool,
    separator: String
}
impl<'a> LauncherGridView<'a> {
    pub fn new (state: &'a Launcher, buf: &'a mut Buffer, area: Rect, focused: bool) -> Self {
        let separator = format!("├{}┤", "-".repeat((area.width - 2).into()));
        Self { state, buf, area, separator, focused }
    }
    pub fn draw (&mut self) -> Usually<Rect> {
        //self.separator_h(0, false);
        //self.separator_h(2, false);
        //self.separator_h((self.state.cursor.1 * 2) as u16, true);
        //self.separator_h(((self.state.cursor.1 + 1) * 2) as u16, true);
        self.area.height = self.state.scenes.len() as u16 + 2;
        let style = Some(Style::default().green().dim());
        if self.focused {
            let Rect { x, y, width, height } = self.area;
            lozenge_left(self.buf, x, y, height, style);
            lozenge_right(self.buf, x + width - 1, y, height, style);
        }

        let columns = self.column_names();

        let mut x = self.area.x;
        for (i, w) in self.column_widths().iter().enumerate() {
            if x >= self.area.x + self.area.width {
                break
            }
            self.separator_v(x, i == self.state.cursor.0);
            x = x + w;
            self.separator_v(x, i == self.state.cursor.0);
        }

        let (mut x, y) = (self.area.x, self.area.y);
        for (i, title) in columns.iter().enumerate() {
            if x >= self.area.x + self.area.width {
                break
            }
            title.blit(
                self.buf, x+1, y, Some(self.highlight(i == self.state.cursor.0).bold())
            );
            if i == 0 {
                self.scenes(x+1, y + 1);
            } else if i < columns.len() {
                self.clips(x+1, y + 1, i - 1);
            }
            let w = (title.len() as u16).max(10) + 3;
            x = x + w;
        }

        "＋Add track…".blit(self.buf, x + 2, y, Some(Style::default().dim()));
        Ok(self.area)
    }

    fn column_names (&self) -> Vec<&'a str> {
        let mut columns = vec![self.state.name.as_str()];
        for track in self.state.tracks.iter() {
            columns.push(track.name.as_str());
        }
        columns
    }

    fn column_widths (&self) -> Vec<u16> {
        self.column_names().iter().map(|name|(name.len() as u16).max(10) + 3).collect()
    }

    fn scenes (&mut self, x: u16, y: u16) -> u16 {
        let mut index = 0usize;
        loop {
            if index >= self.state.scenes.len() {
                break
            }
            if y + index as u16 >= self.area.height {
                break
            }
            if let Some(scene) = self.state.scenes.get(index) {
                let style = Some(self.highlight(
                    (0 == self.state.cursor.0) && (index + 1 == self.state.cursor.1)
                ).bold());
                "⯈".blit(self.buf, x, y + index as u16, style);
                scene.name.blit(self.buf, x+1, y + index as u16, style);
            }
            index = index + 1;
        }
        let hi = (0 == self.state.cursor.0) &&
                 (self.state.scenes.len() + 1 == self.state.cursor.1);
        "＋Add scene…".blit(self.buf, x, y + index as u16, Some(if hi {
            self.highlight(true)
        } else {
            Style::default().dim()
        }));
        index as u16
    }

    fn clips (&mut self, x: u16, y: u16, track: usize) -> u16 {
        let mut index = 0;
        loop {
            if index >= self.state.scenes.len() {
                break
            }
            if y + index as u16 >= self.area.height {
                break
            }
            if let Some(scene) = self.state.scenes.get(index) {
                let hi = (track + 1 == self.state.cursor.0) &&
                         (index + 1 == self.state.cursor.1);
                let style = Some(self.highlight(hi));
                let clip  = scene.clips.get(track);
                let index = index as u16;
                let label = if let Some(Some(clip)) = clip {
                    let track  = self.state.tracks[track].sequencer.state();
                    let phrase = track.phrases.get(*clip);
                    if let Some(phrase) = phrase {
                        format!("⯈{}", phrase.name)
                    } else {
                        format!("????")
                    }
                } else {
                    format!("  ·········")
                };
                label.blit(self.buf, x, y + index, style);
            }
            index = index + 1;
        }
        let hi = (track + 1 == self.state.cursor.0) &&
                 (self.state.scenes.len() + 1 == self.state.cursor.1);
        " + Add clip".blit(self.buf, x, y + index as u16, Some(if hi {
            self.highlight(true)
        } else {
            Style::default().dim()
        }));
        index as u16
    }

    fn highlight (&self, highlight: bool) -> Style {
        if highlight {
            if self.focused {
                Style::default().green().not_dim()
            } else {
                Style::default().green().dim()
            }
        } else {
            Style::default()
        }
    }

    fn separator_h (&mut self, y: u16, highlight: bool) {
        let style = Some(self.highlight(highlight));
        self.separator.blit(self.buf, self.area.x, self.area.y + y, style);
    }

    fn separator_v (&mut self, x: u16, highlight: bool) {
        let style = Some(self.highlight(highlight));
        //"┬".blit(self.buf, x, self.area.y + 0, style);
        for y in self.area.y+1..self.area.y+self.area.height-1 {
            "┊".blit(self.buf, x, y, style);
        }
        //"┴".blit(self.buf, x, self.area.y+self.area.height-1, style);
    }
}