// This file is part of Deja-Vu.
//
// Deja-Vu is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Deja-Vu is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Deja-Vu. If not, see <https://www.gnu.org/licenses/>.
//
use color_eyre::Result;
use ratatui::{
    Frame,
    layout::{Alignment, Rect},
    style::{Color, Style, Stylize},
    text::{Line, Span},
    widgets::{Block, Borders, Clear, Paragraph},
};
use tracing::info;

use core::{
    action::{Action, DiagResult},
    components::Component,
    state::Mode,
};

#[derive(Debug, Clone)]
struct ProgressLine {
    name: String,
    text: String,
    result: DiagResult,
    running: bool,
}

impl ProgressLine {
    pub fn len_name(&self) -> usize {
        self.name.chars().count()
    }
}

#[derive(Default, Debug, Clone)]
pub struct Progress {
    // command_tx: Option<UnboundedSender<Action>>,
    // config: Config,
    lines: Vec<ProgressLine>,
    mode: Mode,
}

impl Progress {
    #[must_use]
    pub fn new() -> Self {
        Self::default()
    }

    // fn register_action_handler(&mut self, tx: UnboundedSender<Action>) -> Result<()> {
    //     self.command_tx = Some(tx);
    //     Ok(())
    // }

    // fn register_config_handler(&mut self, config: Config) -> Result<()> {
    //     self.config = config;
    //     Ok(())
    // }
}

impl Component for Progress {
    fn update(&mut self, action: Action) -> Result<Option<Action>> {
        match action {
            Action::DiagLineStart { text } => {
                info!("Caught Action::DiagLineStart {{ \"{}\" }}", &text);
                self.lines.push(ProgressLine {
                    name: text,
                    text: String::from("OK"),
                    result: DiagResult::Pass,
                    running: true,
                });
            }
            Action::DiagLineUpdate { result, text } => {
                info!(
                    "Caught Action::DiagLineUpdate {{ {}, \"{}\" }}",
                    &result, &text
                );
                if let Some(line) = self.lines.last_mut() {
                    line.result = result;
                    line.text = text;
                }
            }
            Action::DiagLineEnd { text } => {
                info!("Caught Action::DiagLineEnd {{ \"{}\" }}", &text);
                if let Some(line) = self.lines.last_mut() {
                    line.running = false;
                }
            }
            Action::SetMode(mode) => {
                self.mode = mode;
                self.lines.clear();
            }
            _ => {}
        };
        Ok(None)
    }

    fn draw(&mut self, frame: &mut Frame, area: Rect) -> Result<()> {
        if self.mode != Mode::BootScan {
            return Ok(());
        }

        let mut body_text = Vec::with_capacity(20); // TODO: Needs fine tuning?
        body_text.push(Line::default());

        // Add line(s)
        self.lines.iter().for_each(|line| {
            //.for_each(|(part, color)| spans.push(Span::styled(part, Style::default().fg(color))));
            //Line::from(spans)
            let color = match line.result {
                DiagResult::Pass => Color::Green,
                DiagResult::Fail => Color::Red,
                DiagResult::Warn => Color::Yellow,
            };
            let text = if line.running || line.text.is_empty() {
                String::from("...")
            } else {
                line.text.clone()
            };
            let text = format!("  [ {text} ] ");
            let width = area.width as usize - line.len_name() - 1 - text.chars().count() - 7; // '  [  ]'
            let spans = vec![
                Span::raw(format!("{} {:.<width$}", &line.name, "")),
                Span::styled(text, Style::default().fg(color)),
            ];
            body_text.push(Line::from(spans).centered());
            body_text.push(Line::default());
            body_text.push(Line::default());
        });

        // Build block
        let outer_block = Block::default()
            .borders(Borders::ALL)
            .style(Style::default().bold());
        let inner_block = Block::default()
            .borders(Borders::NONE)
            .style(Style::default().bold())
            .title("Progress")
            .title_alignment(Alignment::Center);
        let inner = outer_block.inner(area);
        let body = Paragraph::new(body_text).block(inner_block);
        frame.render_widget(Clear, area);
        frame.render_widget(outer_block, area);
        frame.render_widget(body, inner);
        Ok(())
    }
}