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use std::process::{Command, Output};

use crate::{model::OsWindows, Matcher, MatcherExt, Result};

use super::CommandOutput;

/// Represents the "ls" remote command: kitty @ ls
#[derive(Debug, PartialEq)]
pub struct Ls {
    matcher: Option<Matcher>,
}

impl Ls {
    #[must_use]
    #[allow(clippy::new_without_default)]
    pub fn new() -> Self {
        Self { matcher: None }
    }
}

impl MatcherExt for Ls {
    fn matcher(&mut self, matcher: Matcher) -> &Self {
        self.matcher = Some(matcher);
        self
    }
}

impl CommandOutput for Ls {
    type R = OsWindows;
    fn result(output: &Output) -> Result<Self::R> {
        if output.status.success() {
            let ls_output = serde_json::from_slice::<OsWindows>(&output.stdout)?;

            Ok(ls_output)
        } else {
            Err(crate::Error::ErrorExit("kitty @ ls".to_string()))
        }
    }
}

impl<'a> From<&'a Ls> for Command {
    fn from(value: &Ls) -> Self {
        let mut cmd = Command::new("kitty");
        cmd.args(["@", "ls"]);

        if let Some(Matcher::Id(id)) = value.matcher {
            cmd.arg("--match");
            cmd.arg(format!("id:{}", id.0));
        }

        cmd
    }
}

#[cfg(test)]
mod tests {

    use core::panic;
    use std::{
        os::unix::process::ExitStatusExt,
        process::{Command, ExitStatus, Output},
    };

    use pretty_assertions::assert_eq;

    use crate::{
        model::{test_fixture, WindowId},
        remote_command::CommandOutput,
        Matcher, MatcherExt,
    };

    use super::Ls;

    #[test]
    fn test_ls_command_default() {
        let cmd = Command::from(&Ls::new());

        assert_eq!(cmd.get_program(), "kitty");
        assert_eq!(cmd.get_args().collect::<Vec<_>>(), vec!["@", "ls"]);
    }

    #[test]
    fn test_ls_command_match_id() {
        let cmd = Command::from(Ls::new().matcher(Matcher::Id(WindowId(13))));

        assert_eq!(cmd.get_program(), "kitty");
        assert_eq!(
            cmd.get_args().collect::<Vec<_>>(),
            vec!["@", "ls", "--match", "id:13"]
        );
    }

    #[test]
    fn test_ls_output_success() {
        let output = Output {
            status: ExitStatus::from_raw(0),
            stdout: test_fixture::LS_OUTPUT_JSON.as_bytes().to_vec(),
            stderr: "debug info".as_bytes().to_vec(),
        };

        let result = Ls::result(&output).expect("Succesful output was expected");

        assert_eq!(result, *test_fixture::LS_OUTPUT);
    }

    #[test]
    fn test_ls_output_error() {
        let output = Output {
            status: ExitStatus::from_raw(1),
            stdout: "some out put".as_bytes().to_vec(),
            stderr: "debug info".as_bytes().to_vec(),
        };

        let result = Ls::result(&output);

        match result {
            Err(crate::Error::ErrorExit(process)) => assert_eq!(process, "kitty @ ls"),
            r => panic!("Unexpected result: {r:?}"),
        };
    }
}