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use failure::Error;
use std::fmt;

use formatting;
use steps::check_errors::CompilerMessage;

pub type Result<T> = ::std::result::Result<T, Error>;

#[derive(Debug, Fail)]
pub enum TestingError {
    UnexpectedBuildSuccess,

    CrateBuildFailed {
        stdout: String,
        stderr: String,
    },

    MessageExpectationsFailed {
        unexpected: Vec<CompilerMessage>,
        missing: Vec<CompilerMessage>,
    },
}

struct ErrorDisplay<S1, S2>
where
    S1: AsRef<str>,
    S2: AsRef<str>,
{
    header: S1,
    content: Option<S2>,
}

impl fmt::Display for TestingError {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        let display = match self {
            TestingError::UnexpectedBuildSuccess => ErrorDisplay {
                header: "Expected the crate to build with error, but the build was succesful!",
                content: None,
            },

            TestingError::CrateBuildFailed { stdout, stderr } => ErrorDisplay {
                header: "Unable to build the crate!",
                content: Some({
                    let mut output = String::new();

                    if stdout.len() > 0 {
                        output += &format!("{}\n", formatting::display_block("stdout:", stdout));
                    }

                    if stderr.len() > 0 {
                        output += &format!("{}", formatting::display_block("stderr:", stderr));
                    }

                    output
                }),
            },

            TestingError::MessageExpectationsFailed {
                unexpected,
                missing,
            } => ErrorDisplay {
                header: "Compiler messages don't fulfill expectations!",
                content: Some(format!(
                    "Unexpected messages:\n{}\nMissing messages:\n{}\n",
                    formatting::display_list(unexpected),
                    formatting::display_list(missing)
                )),
            },
        };

        display.fmt(f)
    }
}

impl<S1, S2> fmt::Display for ErrorDisplay<S1, S2>
where
    S1: AsRef<str>,
    S2: AsRef<str>,
{
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "{}", self.header.as_ref())?;

        if let Some(ref content) = self.content {
            write!(f, "\n\n{}", content.as_ref())?;
        }

        Ok(())
    }
}