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use std::process;

use errors::dump_buffer;
use errors::OutputError;
use errors::OutputResult;

/// Converts a type to an [`OutputResult`].
///
/// This is for example implemented on [`std::process::Output`].
///
/// # Examples
///
/// ```rust
/// use assert_cmd::prelude::*;
///
/// use std::process::Command;
///
/// let result = Command::new("echo")
///     .args(&["42"])
///     .ok();
/// assert!(result.is_ok());
/// ```
///
/// [`std::process::Output`]: https://doc.rust-lang.org/std/process/struct.Output.html
/// [`OutputResult`]: type.OutputResult.html
pub trait OutputOkExt
where
    Self: ::std::marker::Sized,
{
    /// Convert an [`Output`][Output] to an [`OutputResult`][OutputResult].
    ///
    /// # Examples
    ///
    /// ```rust
    /// use assert_cmd::prelude::*;
    ///
    /// use std::process::Command;
    ///
    /// let result = Command::new("echo")
    ///     .args(&["42"])
    ///     .ok();
    /// assert!(result.is_ok());
    /// ```
    ///
    /// [Output]: https://doc.rust-lang.org/std/process/struct.Output.html
    /// [OutputResult]: type.OutputResult.html
    fn ok(self) -> OutputResult;

    /// Unwrap a [`Output`][Output] but with a prettier message than `.ok().unwrap()`.
    ///
    /// # Examples
    ///
    /// ```rust
    /// use assert_cmd::prelude::*;
    ///
    /// use std::process::Command;
    ///
    /// let output = Command::new("echo")
    ///     .args(&["42"])
    ///     .unwrap();
    /// ```
    ///
    /// [Output]: https://doc.rust-lang.org/std/process/struct.Output.html
    fn unwrap(self) -> process::Output {
        match self.ok() {
            Ok(output) => output,
            Err(err) => panic!("{}", err),
        }
    }

    /// Unwrap a [`Output`][Output] but with a prettier message than `ok().err().unwrap()`.
    ///
    /// # Examples
    ///
    /// ```rust
    /// use assert_cmd::prelude::*;
    ///
    /// use std::process::Command;
    ///
    /// let err = Command::main_binary()
    ///     .unwrap()
    ///     .env("exit", "42")
    ///     .unwrap_err();
    /// ```
    ///
    /// [Output]: https://doc.rust-lang.org/std/process/struct.Output.html
    fn unwrap_err(self) -> OutputError {
        match self.ok() {
            Ok(output) => panic!(
                "Command completed successfully\nstdout=```{}```",
                dump_buffer(&output.stdout)
            ),
            Err(err) => err,
        }
    }
}

impl OutputOkExt for process::Output {
    fn ok(self) -> OutputResult {
        if self.status.success() {
            Ok(self)
        } else {
            let error = OutputError::new(self);
            Err(error)
        }
    }
}

impl<'c> OutputOkExt for &'c mut process::Command {
    fn ok(self) -> OutputResult {
        let output = self.output().map_err(OutputError::with_cause)?;
        if output.status.success() {
            Ok(output)
        } else {
            let error = OutputError::new(output).set_cmd(format!("{:?}", self));
            Err(error)
        }
    }

    fn unwrap_err(self) -> OutputError {
        match self.ok() {
            Ok(output) => panic!(
                "Completed successfully:\ncommand=`{:?}`\nstdout=```{}```",
                self,
                dump_buffer(&output.stdout)
            ),
            Err(err) => err,
        }
    }
}