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use crate::{features::FeatureMatrix, Error};
use lazy_static::lazy_static;
use std::{
    env, ffi::OsString, io::Write, path::Path, process::Command, process::Stdio,
};
use yansi::Color::*;

pub(crate) struct Task<'t> {
    matrix: FeatureMatrix<'t>,
    manifest_path: Option<&'t Path>,
    package_name: &'t str,
    args: &'t [String],
    command: &'t str,
    kind: TaskKind,
}

#[derive(Copy, Clone)]
pub enum TaskKind {
    DryRun,
    PrintJobs,
    Execute,
}

impl<'t> Task<'t> {
    pub(crate) fn new(
        kind: TaskKind,
        command: &'t str,
        manifest_path: Option<&'t Path>,
        package_name: &'t str,
        args: &'t [String],
        matrix: FeatureMatrix<'t>,
    ) -> Self {
        Self {
            matrix,
            manifest_path,
            package_name,
            args,
            command,
            kind,
        }
    }

    pub(crate) fn run(self) -> Result<(), Error> {
        match self.kind {
            TaskKind::DryRun => self.execute(true),
            TaskKind::PrintJobs => {
                self.print_jobs();
                Ok(())
            }
            TaskKind::Execute => self.execute(false),
        }
    }

    fn execute(self, dry_run: bool) -> Result<(), Error> {
        let mut exit_status = None;
        for feature_set in self.matrix {
            let feature_set = feature_set.to_string();

            let cmd = if dry_run {
                None
            } else {
                let mut cmd = Command::new(CARGO.as_os_str());
                cmd.arg(self.command)
                    .args(self.args.iter())
                    .stderr(Stdio::piped())
                    .stdout(Stdio::piped())
                    .arg("--package")
                    .arg(self.package_name);

                if let Some(manifest_path) = self.manifest_path {
                    cmd.arg("--manifest-path").arg(manifest_path);
                }

                if !feature_set.is_empty() {
                    cmd.arg("--features").arg(&feature_set);
                }

                Some(cmd)
            };

            print!(
                "{}{} {}{} {}{}{}......",
                Cyan.paint("running: cmd="),
                self.command,
                Cyan.paint("package="),
                self.package_name,
                Cyan.paint("features=["),
                feature_set,
                Cyan.paint("]")
            );

            let on_success =
                || println!("{}", Black.style().bg(Green).paint("OK"));

            match cmd {
                None => on_success(),
                Some(mut cmd) => {
                    let output = cmd.output().map_err(|err| Error::Io {
                        message: "failed to get output of cargo command",
                        source: err,
                    })?;
                    if output.status.success() {
                        on_success();
                    } else {
                        println!("{}", Black.style().bg(Red).paint("Fail"));
                        exit_status = Some(output.status);
                        std::io::stderr()
                            .write_all(&output.stderr)
                            .expect("failed to write to stderr");
                        std::io::stdout()
                            .write_all(&output.stdout)
                            .expect("failed to write to stdout");
                    }
                }
            };
        }

        match exit_status {
            Some(exit_status) => Err(Error::Fail(exit_status)),
            None => Ok(()),
        }
    }

    fn print_jobs(self) {
        let prefix = format!(
            "{} {} --package {} {}",
            CARGO.to_string_lossy(),
            self.command,
            self.package_name,
            self.args.join(" ")
        );
        for feature_set in self.matrix {
            if feature_set.is_empty() {
                println!("{}", prefix);
            } else {
                println!("{} --features {}", prefix, feature_set);
            }
        }
    }
}

lazy_static! {
    static ref CARGO: OsString =
        env::var_os("CARGO").unwrap_or_else(|| "cargo".into());
}