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use crate::{
    conn::{tty, Headers, Payload},
    opts,
    util::url,
    Result,
};

use futures_util::future::TryFutureExt;
use futures_util::stream::Stream;

impl_api_ty!(Exec => id);

impl<'podman> Exec<'podman> {
    api_doc! {
    Exec => StartLibpod
    /// Starts a previously set up exec instance. If `detach` is true, this endpoint returns
    /// immediately after starting the command. Otherwise, it sets up an interactive session
    /// with the command.
    ///
    /// To create an exec instance use [`Container::create_exec`](crate::api::Container::create_exec).
    ///
    /// Examples:
    ///
    /// ```no_run
    /// use futures_util::StreamExt;
    /// let podman = Podman::unix("/run/user/1000/podman/podman.sock");
    /// let container = podman.containers().get("451b27c6b9d3");
    ///
    /// let exec = container
    ///     .create_exec(
    ///         &podman_api::opts::ExecCreateOpts::builder()
    ///             .command(["cat", "/some/path/in/container"])
    ///             .build(),
    ///     )
    ///     .await
    ///     .unwrap();
    ///
    /// let stream = exec.start();
    ///
    /// while let Some(chunk) = stream.next().await {
    ///     println!("{:?}", chunk.unwrap());
    /// }
    /// ```
    |
    pub fn start(
        &'podman self,
        opts: &'podman opts::ExecStartOpts,
    ) -> impl Stream<Item = Result<tty::TtyChunk>> + 'podman {
        let ep = format!("/libpod/exec/{}/start", &self.id);
        Box::pin(
            async move {
                let payload = Payload::Json(opts.serialize()?);
                let stream = Box::pin(self.podman.stream_post(ep, payload, Headers::none()));

                Ok(tty::decode(stream))
            }
            .try_flatten_stream(),
        )
    }}

    api_doc! {
    Exec => InspectLibpod
    /// Returns low-level information about an exec instance.
    ///
    /// Examples:
    ///
    /// ```no_run
    /// use futures_util::StreamExt;
    /// let podman = Podman::unix("/run/user/1000/podman/podman.sock");
    /// let container = podman.containers().get("451b27c6b9d3");
    ///
    /// let exec = container
    ///     .create_exec(
    ///         &podman_api::opts::ExecCreateOpts::builder()
    ///             .command(["cat", "/some/path/in/container"])
    ///             .build(),
    ///     )
    ///     .await
    ///     .unwrap();
    ///
    /// match exec.inspect().await {
    ///     Ok(info) => println!("{:?}", info),
    ///     Err(e) => eprintln!("{}", e)
    /// }
    /// ```
    |
    pub async fn inspect(
        &self,
    ) -> Result<serde_json::Value> {
        let ep = format!("/libpod/exec/{}/json", &self.id);
        self.podman.get_json(&ep).await
    }}

    api_doc! {
    Exec => ResizeLibpod
    /// Resize the TTY session used by an exec instance. This endpoint only works if
    /// tty was specified as part of creating and starting the exec instance.
    ///
    /// Examples:
    ///
    /// ```no_run
    /// use futures_util::StreamExt;
    /// let podman = Podman::unix("/run/user/1000/podman/podman.sock");
    /// let container = podman.containers().get("451b27c6b9d3");
    ///
    /// let exec = container
    ///     .create_exec(
    ///         &podman_api::opts::ExecCreateOpts::builder()
    ///             .command(["cat", "/some/path/in/container"])
    ///             .build(),
    ///     )
    ///     .await
    ///     .unwrap();
    ///
    /// if let Err(e) = exec.resize(1280, 720).await {
    ///     eprintln!("{}", e);
    /// }
    /// ```
    |
    pub async fn resize(&self, width: usize, heigth: usize) -> Result<()> {
        let ep = url::construct_ep(
            format!("/libpod/exec/{}/resize", &self.id),
            Some(url::encoded_pairs([
                ("h", heigth.to_string()),
                ("w", width.to_string()),
            ])),
        );
        self.podman.get_json(&ep).await
    }}
}