use crate::{CliprdrError, CliprdrServiceContext};

#[cfg(target_os = "windows")]
pub mod windows;
#[cfg(target_os = "windows")]
pub fn create_cliprdr_context(
    enable_files: bool,
    enable_others: bool,
    response_wait_timeout_secs: u32,
) -> crate::ResultType<Box<dyn crate::CliprdrServiceContext>> {
    let boxed =
        windows::create_cliprdr_context(enable_files, enable_others, response_wait_timeout_secs)?
            as Box<_>;
    Ok(boxed)
}

#[cfg(any(target_os = "linux", target_os = "macos"))]
/// use FUSE for file pasting on these platforms
pub mod fuse;
#[cfg(target_os = "linux")]
pub mod linux;
#[cfg(target_os = "linux")]
pub fn create_cliprdr_context(
    enable_files: bool,
    _enable_others: bool,
    response_wait_timeout_secs: u32,
) -> crate::ResultType<Box<dyn crate::CliprdrServiceContext>> {
    use hbb_common::log;

    if !enable_files {
        return Ok(Box::new(DummyCliprdrContext {}) as Box<_>);
    }

    let timeout = std::time::Duration::from_secs(response_wait_timeout_secs as u64);
    let mut tmp_path = std::env::temp_dir();
    tmp_path.push("rustdesk-cliprdr");

    log::info!("clear previously mounted cliprdr FUSE");
    if let Err(e) = std::process::Command::new("umount").arg(&tmp_path).status() {
        log::warn!("umount {:?} may fail: {:?}", tmp_path, e);
    }

    let rd_mnt = if !tmp_path.exists() {
        log::info!("create mount point: {}", tmp_path.display());
        std::fs::create_dir_all(tmp_path.clone())?;
        tmp_path
    } else if !tmp_path.is_dir() {
        log::error!("{} is occupied and is not a directory", tmp_path.display());
        return Err(CliprdrError::CliprdrInit.into());
    } else {
        tmp_path
    };

    let linux_ctx = linux::ClipboardContext::new(timeout, rd_mnt)?;
    log::debug!("start cliprdr FUSE");
    linux_ctx.run().expect("failed to start cliprdr FUSE");

    Ok(Box::new(linux_ctx) as Box<_>)
}

struct DummyCliprdrContext {}

impl CliprdrServiceContext for DummyCliprdrContext {
    fn set_is_stopped(&mut self) -> Result<(), CliprdrError> {
        Ok(())
    }
    fn empty_clipboard(&mut self, _conn_id: i32) -> Result<bool, CliprdrError> {
        Ok(true)
    }
    fn server_clip_file(
        &mut self,
        _conn_id: i32,
        _msg: crate::ClipboardFile,
    ) -> Result<(), crate::CliprdrError> {
        Ok(())
    }
}

// begin of epoch used by microsoft
// 1601-01-01 00:00:00 + LDAP_EPOCH_DELTA*(100 ns) = 1970-01-01 00:00:00
#[cfg(target_os = "linux")]
const LDAP_EPOCH_DELTA: u64 = 116444772610000000;