use crate::core::*;
use std::path::{Path, PathBuf};
use std::fs::{File, create_dir_all};

const CONFIG_FILE_NAME:  &'static str = "tek.toml";
const PROJECT_FILE_NAME: &'static str = "project.toml";

pub struct AppPaths {
    config_dir:   PathBuf,
    config_file:  PathBuf,
    data_dir:     PathBuf,
    project_file: PathBuf,
}
impl AppPaths {
    pub fn new (xdg: &XdgApp) -> Usually<Self> {
        let config_dir   = PathBuf::from(xdg.app_config()?);
        let config_file  = PathBuf::from(config_dir.join(CONFIG_FILE_NAME));
        let data_dir     = PathBuf::from(xdg.app_data()?);
        let project_file = PathBuf::from(data_dir.join(PROJECT_FILE_NAME));
        Ok(Self { config_dir, config_file, data_dir, project_file })
    }
    pub fn should_create (&self) -> bool {
        for path in [
            &self.config_dir,
            &self.config_file,
            &self.data_dir,
            &self.project_file,
        ].iter() {
            if !Path::new(path).exists() {
                return true
            }
        }
        false
    }
    pub fn create (&self) -> Usually<()> {
        for dir in [&self.config_dir, &self.data_dir].iter() {
            if !Path::new(dir).exists() {
                create_dir_all(&dir)?;
            }
        }
        for file in [&self.config_file, &self.project_file].iter() {
            if !Path::new(file).exists() {
                File::create_new(&file)?;
            }
        }
        Ok(())
    }
}

pub struct SetupModal(pub Option<Arc<XdgApp>>);

render!(SetupModal |self, buf, area| {
    for cell in buf.content.iter_mut() {
        cell.fg = ratatui::style::Color::Gray;
        cell.modifier = ratatui::style::Modifier::DIM;
    }
    let lines = [
        ("                           ", Style::default().white().on_black().not_dim().bold()),
        (" Welcome to TEK!           ", Style::default().white().on_black().not_dim().bold()),
        ("                           ", Style::default().white().on_black().not_dim().bold()),
        (" Press ENTER to create the ", Style::default().white().on_black().not_dim()),
        (" following directories:    ", Style::default().white().on_black().not_dim()),
        ("                           ", Style::default().white().on_black().not_dim().bold()),
        (" Configuration directory:  ", Style::default().white().on_black().not_dim()),
        ("   ~/.config/tek           ", Style::default().white().on_black().not_dim().bold()),
        ("                           ", Style::default().white().on_black().not_dim()),
        (" Data directory:           ", Style::default().white().on_black().not_dim()),
        ("   ~/.local/share/tek      ", Style::default().white().on_black().not_dim().bold()),
        ("                           ", Style::default().white().on_black().not_dim().bold()),
        (" Or press CTRL-C to exit.  ", Style::default().white().on_black().not_dim()),
        ("                           ", Style::default().white().on_black().not_dim()),
    ];
    let width = lines[0].0.len() as u16;
    let x = area.x + (area.width - width) / 2;
    for (i, (line, style)) in lines.iter().enumerate() {
        line.blit(buf, x, area.y + area.height / 2 - (lines.len() / 2) as u16 + i as u16, Some(*style));
    }
    Ok(area)
});
handle!(SetupModal |self, e| {
    if let AppEvent::Input(::crossterm::event::Event::Key(KeyEvent {
        code: KeyCode::Enter,
        ..
    })) = e {
        AppPaths::new(&self.0.as_ref().unwrap())?.create()?;
        self.0 = None;
        Ok(true)
    } else {
        Ok(false)
    }
});