use anyhow::{Context as _, Result};
use client::ZED_URL_SCHEME;
use gpui::{AppContext as _, AsyncApp, Context, PromptLevel, Window, actions};
use release_channel::ReleaseChannel;
use std::ops::Deref;
use std::path::{Path, PathBuf};
use util::ResultExt;
use workspace::notifications::{DetachAndPromptErr, NotificationId};
use workspace::{Toast, Workspace};

actions!(cli, [Install, RegisterZedScheme]);

async fn install_script(cx: &AsyncApp) -> Result<PathBuf> {
    let cli_path = cx.update(|cx| cx.path_for_auxiliary_executable("cli"))??;
    let link_path = Path::new("/usr/local/bin/zed");
    let bin_dir_path = link_path.parent().unwrap();

    // Don't re-create symlink if it points to the same CLI binary.
    if smol::fs::read_link(link_path).await.ok().as_ref() == Some(&cli_path) {
        return Ok(link_path.into());
    }

    // If the symlink is not there or is outdated, first try replacing it
    // without escalating.
    smol::fs::remove_file(link_path).await.log_err();
    // todo("windows")
    #[cfg(not(windows))]
    {
        if smol::fs::unix::symlink(&cli_path, link_path)
            .await
            .log_err()
            .is_some()
        {
            return Ok(link_path.into());
        }
    }

    // The symlink could not be created, so use osascript with admin privileges
    // to create it.
    let status = smol::process::Command::new("/usr/bin/osascript")
        .args([
            "-e",
            &format!(
                "do shell script \" \
                    mkdir -p \'{}\' && \
                    ln -sf \'{}\' \'{}\' \
                \" with administrator privileges",
                bin_dir_path.to_string_lossy(),
                cli_path.to_string_lossy(),
                link_path.to_string_lossy(),
            ),
        ])
        .stdout(smol::process::Stdio::inherit())
        .stderr(smol::process::Stdio::inherit())
        .output()
        .await?
        .status;
    anyhow::ensure!(status.success(), "error running osascript");
    Ok(link_path.into())
}

pub async fn register_zed_scheme(cx: &AsyncApp) -> anyhow::Result<()> {
    cx.update(|cx| cx.register_url_scheme(ZED_URL_SCHEME))?
        .await
}

pub fn install_cli(window: &mut Window, cx: &mut Context<Workspace>) {
    const LINUX_PROMPT_DETAIL: &str = "If you installed Zed from our official release add ~/.local/bin to your PATH.\n\nIf you installed Zed from a different source like your package manager, then you may need to create an alias/symlink manually.\n\nDepending on your package manager, the CLI might be named zeditor, zedit, zed-editor or something else.";

    cx.spawn_in(window, async move |workspace, cx| {
        if cfg!(any(target_os = "linux", target_os = "freebsd")) {
            let prompt = cx.prompt(
                PromptLevel::Warning,
                "CLI should already be installed",
                Some(LINUX_PROMPT_DETAIL),
                &["Ok"],
            );
            cx.background_spawn(prompt).detach();
            return Ok(());
        }
        let path = install_script(cx.deref())
            .await
            .context("error creating CLI symlink")?;

        workspace.update_in(cx, |workspace, _, cx| {
            struct InstalledZedCli;

            workspace.show_toast(
                Toast::new(
                    NotificationId::unique::<InstalledZedCli>(),
                    format!(
                        "Installed `zed` to {}. You can launch {} from your terminal.",
                        path.to_string_lossy(),
                        ReleaseChannel::global(cx).display_name()
                    ),
                ),
                cx,
            )
        })?;
        register_zed_scheme(&cx).await.log_err();
        Ok(())
    })
    .detach_and_prompt_err("Error installing zed cli", window, cx, |_, _, _| None);
}