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use std::ffi::OsStr;
use std::fs::remove_file;
use std::process::{Command, Stdio};

use anyhow::anyhow;
use bczhc_lib::str::GenericOsStrExt;
use colored::Colorize;
use indicatif::{ProgressBar, ProgressStyle};

use crate::cli::DedupeArgs;
use crate::group::collect_and_group_files;
use crate::{parse_input_file, print_redundant_size};

macro_rules! os_str {
    ($s:expr) => {
        OsStr::new($s)
    };
}

pub fn main(args: DedupeArgs) -> anyhow::Result<()> {
    let groups = match args.common.input_file {
        None => collect_and_group_files(&args.common)?,
        Some(f) => parse_input_file(&f)?,
    };

    print_redundant_size(&groups);

    let operation_count = groups.iter().map(|x| x.files.len() as u64 - 1).sum::<u64>();
    let pb = if args.dry_run {
        None
    } else {
        let pb = ProgressBar::new(operation_count);
        pb.set_style(
            ProgressStyle::default_bar()
                .template("{msg} {bar:50} {pos}/{len}")
                .unwrap(),
        );
        pb.set_message("Reflinking".cyan().bold().to_string());
        Some(pb)
    };

    // TODO: to many messy branches
    for group in groups {
        let files = &group.files;
        let src = &files[0];
        for dest in files.iter().skip(1) {
            pb.then(|x| x.inc(1));
            let result: anyhow::Result<()> = try {
                if args.use_cp_cmd.yes() {
                    // use `cp` command
                    let cmd = [
                        os_str!("cp"),
                        os_str!("--reflink"),
                        // archive mode
                        os_str!("-a"),
                        src.as_os_str(),
                        dest.as_os_str(),
                    ];

                    if args.dry_run {
                        println!("{:?}", cmd);
                    } else {
                        let child = Command::new(cmd[0])
                            .args(&cmd[1..])
                            .stdin(Stdio::null())
                            .stderr(Stdio::piped())
                            .stdout(Stdio::piped())
                            .spawn()?;
                        let output = child.wait_with_output()?;
                        if !output.stderr.is_empty() {
                            pb.then(|x| {
                                x.println(format!(
                                    "cmd stderr: {}",
                                    String::from_utf8_lossy(&output.stderr)
                                ));
                            });
                        }
                        if !output.stdout.is_empty() {
                            pb.then(|x| {
                                x.println(format!(
                                    "cmd stdout: {}",
                                    String::from_utf8_lossy(&output.stdout)
                                ))
                            });
                        };
                        if !output.status.success() {
                            Err(anyhow!(
                                "Program exited with non-zero status: {}; cmd: {:?}",
                                output.status,
                                cmd
                            ))?;
                        }
                    }
                } else {
                    // use `reflink` crate
                    // TODO: by this approach I'm not familiar about its internal details
                    //  and have some trouble preserving the file timestamp, which is
                    //  important in my use case. So I by default choose using
                    //  `ls --reflink -a` command.
                    if args.dry_run {
                        println!("{:?} -> {:?}", src, dest);
                    } else {
                        // first the dest file should be deleted
                        remove_file(dest)
                            .map_err(|e| anyhow!("Dest file lost: {}, {:?}", e, dest))?;
                        reflink::reflink(src, dest)?;
                        if !dest.exists() {
                            Err(anyhow!(
                                "Check failed: destination file doesn't exist: {:?}",
                                dest
                            ))?;
                        }
                    }
                }
            };
            if let Err(e) = result && let Some(ref b) = pb {
                b.println(format!(
                    "Reflinking error: ({} -> {}) {}",
                    src.escape(),
                    dest.escape(),
                    e
                ));
            }
        }
    }

    Ok(())
}

trait OptionThen<T> {
    fn then<F>(&self, f: F)
    where
        F: Fn(&T);
}

impl<T> OptionThen<T> for Option<T> {
    #[inline]
    fn then<F>(&self, f: F)
    where
        F: Fn(&T),
    {
        if let Some(s) = self {
            f(s)
        }
    }
}