// Copyright 2019-2021 Tauri Programme within The Commons Conservancy
// SPDX-License-Identifier: Apache-2.0
// SPDX-License-Identifier: MIT

use auto_launch::{AutoLaunch, AutoLaunchBuilder};
use serde::{ser::Serializer, Serialize};
use tauri::{
    command,
    plugin::{Builder, TauriPlugin},
    Manager, Runtime, State,
};

use std::env::current_exe;

type Result<T> = std::result::Result<T, Error>;

#[derive(Debug, Copy, Clone)]
pub enum MacosLauncher {
    LaunchAgent,
    AppleScript,
}

#[derive(Debug, thiserror::Error)]
pub enum Error {
    #[error(transparent)]
    Io(#[from] std::io::Error),
    #[error("{0}")]
    Anyhow(String),
}

impl Serialize for Error {
    fn serialize<S>(&self, serializer: S) -> std::result::Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        serializer.serialize_str(self.to_string().as_ref())
    }
}

pub struct AutoLaunchManager(AutoLaunch);

impl AutoLaunchManager {
    pub fn enable(&self) -> Result<()> {
        self.0
            .enable()
            .map_err(|e| e.to_string())
            .map_err(Error::Anyhow)
    }

    pub fn disable(&self) -> Result<()> {
        self.0
            .disable()
            .map_err(|e| e.to_string())
            .map_err(Error::Anyhow)
    }

    pub fn is_enabled(&self) -> Result<bool> {
        self.0
            .is_enabled()
            .map_err(|e| e.to_string())
            .map_err(Error::Anyhow)
    }
}

pub trait ManagerExt<R: Runtime> {
    fn autolaunch(&self) -> State<'_, AutoLaunchManager>;
}

impl<R: Runtime, T: Manager<R>> ManagerExt<R> for T {
    fn autolaunch(&self) -> State<'_, AutoLaunchManager> {
        self.state::<AutoLaunchManager>()
    }
}

#[command]
async fn enable(manager: State<'_, AutoLaunchManager>) -> Result<()> {
    manager.enable()
}

#[command]
async fn disable(manager: State<'_, AutoLaunchManager>) -> Result<()> {
    manager.disable()
}

#[command]
async fn is_enabled(manager: State<'_, AutoLaunchManager>) -> Result<bool> {
    manager.is_enabled()
}

/// Initializes the plugin.
///
/// `args` - are passed to your app on startup.
pub fn init<R: Runtime>(
    macos_launcher: MacosLauncher,
    args: Option<Vec<&'static str>>,
) -> TauriPlugin<R> {
    Builder::new("autostart")
        .invoke_handler(tauri::generate_handler![enable, disable, is_enabled])
        .setup(move |app| {
            let mut builder = AutoLaunchBuilder::new();

            builder.set_app_name(&app.package_info().name);
            if let Some(args) = args {
                builder.set_args(&args);
            }
            builder.set_use_launch_agent(matches!(macos_launcher, MacosLauncher::LaunchAgent));

            let current_exe = current_exe()?;

            #[cfg(windows)]
            builder.set_app_path(&current_exe.display().to_string());
            #[cfg(target_os = "macos")]
            builder.set_app_path(&current_exe.canonicalize()?.display().to_string());
            #[cfg(target_os = "linux")]
            if let Some(appimage) = app
                .env()
                .appimage
                .and_then(|p| p.to_str().map(|s| s.to_string()))
            {
                builder.set_app_path(&appimage);
            } else {
                builder.set_app_path(&current_exe.display().to_string());
            }

            app.manage(AutoLaunchManager(
                builder.build().map_err(|e| e.to_string())?,
            ));
            Ok(())
        })
        .build()
}