use std::path;

use crate::context::AppContext;
use crate::error::JoshutoResult;
use crate::history::DirectoryHistory;
use crate::tab::{JoshutoTab, TabHomePage};
use crate::util::load_child::LoadChild;

use crate::HOME_DIR;

use super::quit;

fn _tab_switch(new_index: usize, context: &mut AppContext) -> std::io::Result<()> {
    context.tab_context_mut().index = new_index;
    let cwd = context.tab_context_ref().curr_tab_ref().cwd().to_path_buf();
    std::env::set_current_dir(cwd.as_path())?;

    let entry_path = match context
        .tab_context_ref()
        .curr_tab_ref()
        .curr_list_ref()
        .and_then(|l| l.curr_entry_ref())
    {
        Some(entry) => {
            let file_path = entry.file_path();
            if file_path.is_dir() {
                Some(file_path.to_path_buf())
            } else {
                None
            }
        }
        None => None,
    };

    let options = context.config_ref().display_options_ref().clone();
    let history = context.tab_context_mut().curr_tab_mut().history_mut();
    history.create_or_soft_update(cwd.as_path(), &options)?;

    if let Some(file_path) = entry_path {
        history.create_or_soft_update(file_path.as_path(), &options)?;
    }

    Ok(())
}

pub fn tab_switch(offset: i32, context: &mut AppContext) -> std::io::Result<()> {
    let index = context.tab_context_ref().index;
    let num_tabs = context.tab_context_ref().len();
    let new_index = (index as i32 + num_tabs as i32 + offset) as usize % num_tabs;

    _tab_switch(new_index, context)
}

pub fn new_tab_home_path(context: &AppContext) -> path::PathBuf {
    match context.config_ref().tab_options_ref().home_page() {
        TabHomePage::Home => match HOME_DIR.as_ref() {
            Some(s) => s.clone(),
            None => path::PathBuf::from("/"),
        },
        TabHomePage::Inherit => context.tab_context_ref().curr_tab_ref().cwd().to_path_buf(),
        TabHomePage::Root => path::PathBuf::from("/"),
    }
}

pub fn new_tab(context: &mut AppContext) -> JoshutoResult<()> {
    let new_tab_path = new_tab_home_path(context);

    let tab = JoshutoTab::new(new_tab_path, context.config_ref().display_options_ref())?;
    context.tab_context_mut().push_tab(tab);
    let new_index = context.tab_context_ref().len() - 1;
    context.tab_context_mut().index = new_index;
    _tab_switch(new_index, context)?;
    LoadChild::load_child(context)?;
    Ok(())
}

pub fn close_tab(context: &mut AppContext) -> JoshutoResult<()> {
    if context.tab_context_ref().len() <= 1 {
        return quit::quit(context);
    }
    let mut tab_index = context.tab_context_ref().index;

    let _ = context.tab_context_mut().pop_tab(tab_index);
    let num_tabs = context.tab_context_ref().len();
    if tab_index >= num_tabs {
        tab_index = num_tabs - 1;
    }
    _tab_switch(tab_index, context)?;
    Ok(())
}