/*
 * This file is part of espanso.
 *
 * Copyright (C) 2020 Federico Terzi
 *
 * espanso 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.
 *
 * espanso 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 espanso.  If not, see <https://www.gnu.org/licenses/>.
 */

use std::path::Path;

#[cfg(target_os = "linux")]
fn default_editor() -> String {
    "/bin/nano".to_owned()
}
#[cfg(target_os = "macos")]
fn default_editor() -> String {
    "/usr/bin/nano".to_owned()
}
#[cfg(target_os = "windows")]
fn default_editor() -> String {
    "C:\\Windows\\System32\\notepad.exe".to_owned()
}

pub fn open_editor(file_path: &Path) -> bool {
    use std::process::Command;

    // Check if another editor is defined in the environment variables
    let editor_var = std::env::var_os("EDITOR");
    let visual_var = std::env::var_os("VISUAL");

    // Prioritize the editors specified by the environment variable, use the default one
    let editor: String = if let Some(editor_var) = editor_var {
        editor_var.to_string_lossy().to_string()
    } else if let Some(visual_var) = visual_var {
        visual_var.to_string_lossy().to_string()
    } else {
        default_editor()
    };

    // Start the editor and wait for its termination
    let status = if cfg!(target_os = "windows") {
        Command::new(&editor).arg(file_path).spawn()
    } else {
        // On Unix, spawn the editor using the shell so that it can
        // accept parameters. See issue #245
        Command::new("/bin/bash")
            .arg("-c")
            .arg(format!("{} '{}'", editor, file_path.to_string_lossy()))
            .spawn()
    };

    if let Ok(mut child) = status {
        // Wait for the user to edit the configuration
        let result = child.wait();

        if let Ok(exit_status) = result {
            exit_status.success()
        } else {
            false
        }
    } else {
        println!("Error: could not start editor at: {}", &editor);
        false
    }
}