use std::fs;
use std::path::{Path, PathBuf};
use std::process::{Command, Stdio};
use std::process;
use std::os::unix::fs::MetadataExt;

use crate::utils::parser;
use crate::commands::link::link;


pub fn install(repo: &String, pkgname: &String) -> Result<(), bool> {
    let var_path = super::get_var_path();
    let pkg_md_path = var_path.join(format!("{}/{}.md", &repo, &pkgname));
    let builded_pkg_md_path = PathBuf::from("/pkg").join(&repo).join(&pkgname).join("build-script.md");

    if !pkg_md_path.exists() {
        upload_from_repo(&repo, &pkgname, &pkg_md_path)?;
    }

    if builded_pkg_md_path.exists() {
        if fs::metadata(&builded_pkg_md_path).unwrap().ino() == fs::metadata(&pkg_md_path).unwrap().ino() {
            println!("package {} already installed in {} repo", &pkgname, &repo);
            return Ok(())
        }
    }

    check_build_dependency(&repo, &pkg_md_path)?;
    check_run_dependency(&pkg_md_path)?;
    download(&pkgname, &pkg_md_path)?;

    let src_dir = PathBuf::from("/pkg/src").join(&pkgname);
    patch(&pkgname, &src_dir, &pkg_md_path)?;
    build(&repo, &pkgname, &src_dir, &pkg_md_path)?;
    link(&repo, &pkgname).expect("Failed link package");
    hook(&repo, &pkgname);
    config(&src_dir, &pkg_md_path)?;

    let src_remove_flag = match std::env::var("src_remove") {
        Ok(value) => value != "false",
        Err(_) => true,
    };

    if src_remove_flag {
        if let Err(e) = fs::remove_dir_all(&src_dir) {
            eprintln!("Failed to remove source directory: {}", e);
            return Err(false);
        }
    }

    println!("Package {} installed successfully from repo {}", pkgname, repo);
    Ok(())
}


pub fn install_all(pkgname: &String) {
    let repos = match parser::get_repo_list() {
        Ok(repos) => repos,
        Err(e) => {
            eprintln!("Failed to get repository list: {}", e);
            return;
        }
    };

    let mut success = false;
    for repo in repos {
        println!("Trying to install {} from repo {}...", pkgname, repo);

        match install(&repo, pkgname) {
            Ok(()) => {
                success = true;
                break;
            }
            Err(no_repo_package) => {
                if no_repo_package {
                    continue;
                } else {
                    process::exit(1)
                }
            }
        }
    }
    if !success {
        eprintln!("Package {} not found in any available repository", pkgname);
    }
}


fn upload_from_repo(repo: &String, pkgname: &String, pkg_md_path: &Path) -> Result<(), bool> {
    match parser::get_repo_addr(repo) {
        Ok(repo_addr) => {
            let rsync_command = format!(
                "rsync --include='{}.md' --exclude='*' {} {}",
                pkgname,
                repo_addr,
                pkg_md_path.to_str().unwrap()
            );
            let rsync_output = Command::new("sh")
                .arg("-c")
                .arg(rsync_command)
                .output()
                .expect("Failed to execute rsync");

            if !rsync_output.status.success()  {
                eprintln!("broken repo: {}", repo);
                return Err(false);
            }
            if !pkg_md_path.exists()  {
                eprintln!("not found {} in {} repo", pkgname, repo);
                return Err(true);
            }

            Ok(())
        }
        Err(e) => {
            eprintln!("Repository {} not found: {}", repo, e);
            return Err(true);
        }
    }
}

fn check_build_dependency(repo: &String, pkg_md_path: &Path) -> Result<(), bool> {
    let deps = match parser::get_build_deps(&pkg_md_path) {
        Ok(deps) => deps,
        Err(_) => { return Ok(()) }
    };

    for dependency in deps.lines() {
        if !dependency.trim().is_empty() {
            if !Path::new("/pkg").join(repo).join(dependency).exists() {
                match install(repo, &dependency.to_string()) {
                    Ok(()) => {}
                    Err(_) => {process::exit(1) }
                }
            }
        }
    }

    Ok(())
}

fn check_run_dependency(pkg_md_path: &Path) -> Result<(), bool> {
    let deps = match parser::get_run_deps(pkg_md_path) {
        Ok(deps) => deps,
        Err(_) => { return Ok(()) }
    };

    let repo_list = match parser::get_repo_list() {
        Ok(repos) => repos,
        Err(e) => {
            eprintln!("Failed to get repository list: {}", e);
            return Err(false)
        }
    };
    for dependency in deps.split_whitespace() {
        let mut found = false;

        for repo_name in &repo_list {
            let path = format!("/pkg/{}/{}/", repo_name, dependency);
            if Path::new(&path).exists() {
                found = true;
                break;
            }
        }

        if !found {
            install_all(&dependency.to_string());
        }
    }

    Ok(())
}


fn download(pkgname: &String, pkg_md_path: &Path) -> Result<(), bool> {
    let url = match parser::get_url(pkg_md_path) {
        Ok(url) => url,
        Err(e) => {
            eprintln!("Failed to parse URL: {}", e);
            return Err(false);
        }
    };

    let src = PathBuf::from("/pkg/src").join(pkgname);
    if src.exists() {
        let src_url = fs::read_to_string(src.join("aeropkg.download-url")).unwrap_or("".to_string());
        if url == src_url {
            return Ok(())
        } else {
            println!("url:\n{}\nend url", url);
            println!("src url:\n{}\nend src url", src_url);
            fs::remove_dir_all(&src).unwrap();
        }
    }

    if let Err(e) = fs::create_dir_all(&src) {
        eprintln!("Failed to create directory {}: {}", &src.display(), e);
        return Err(false);
    }

    if !url.ends_with(".git") {
        let compress_flag = if url.ends_with(".bz2") {
            "--bzip2"
        } else if url.ends_with(".xz") {
            "--xz"
        } else if url.ends_with(".lz") {
            "--lzip"
        } else if url.ends_with(".lzma") {
            "--lzma"
        } else if url.ends_with(".lzo") {
            "--lzop"
        } else if url.ends_with(".zst") {
            "--zstd"
        } else if url.ends_with(".gz") {
            "--gzip"
        } else {
            eprintln!("Unsupported compression format for URL: {}", url);
            return Err(false);
        };

        let wget_output = Command::new("wget")
            .arg("-O-")
            .arg("-q")
            .arg("--show-progress")
            .arg(&url)
            .stdout(Stdio::piped())
            .spawn();

        let tar_input = match wget_output {
            Ok(child) => child.stdout.unwrap(),
            Err(e) => {
                eprintln!("Failed to execute wget: {}", e);
                return Err(false);
            }
        };

        let tar_status = Command::new("tar")
            .arg("-x")
            .arg(compress_flag)
            .arg("-C")
            .arg(&src)
            .stdin(tar_input)
            .status();

        if tar_status.is_err() || !tar_status.unwrap().success() {
            eprintln!("Failed to extract archive from URL: {}", url);
            return Err(false);
        }

        let entries = fs::read_dir(&src).unwrap();
        let dirs: Vec<_> = entries
            .filter_map(|entry| entry.ok())
            .filter(|entry| entry.file_type().map_or(false, |ft| ft.is_dir()))
            .collect();

        if dirs.len() == 1 {
            let single_dir = dirs[0].path();

            for entry in fs::read_dir(&single_dir).unwrap() {
                let entry = entry.unwrap();
                let dest = src.join(entry.file_name());
                fs::rename(entry.path(), dest).unwrap();
            }

            fs::remove_dir(single_dir).unwrap();
        }
    } else {
        let git_status = Command::new("git")
            .arg("clone")
            .arg(&url)
            .arg(&src)
            .status();

        if git_status.is_err() || !git_status.unwrap().success() {
            eprintln!("Failed to clone git repository from URL: {}", url);
            return Err(false);
        }
    }

    fs::write(src.join("aeropkg.download-url"), &url).unwrap();

    Ok(())
}


fn patch(
    pkgname: &String,
    src_dir: &Path,
    pkg_md_path: &Path,
) -> Result<(), bool> {
    let patch_script = parser::get_patch_script(pkg_md_path).unwrap_or("".to_string());

    if src_dir.join("aeropkg.applied-patch").exists() {
        let src_patch = fs::read_to_string(src_dir.join("aeropkg.applied-patch")).unwrap_or("".to_string());
        if patch_script == src_patch {
            return Ok(())
        } else {
            println!("patch:\n{}\nend patch", patch_script);
            println!("src patch:\n{}\nend src patch", src_patch);
            fs::remove_dir_all(src_dir).unwrap();
            download(&pkgname, &pkg_md_path)?;
        }
    }

    if patch_script == "" { return Ok(()) }
    let output = Command::new("zsh")
        .arg("-c")
        .arg(&patch_script)
        .current_dir(src_dir)
        .output();

    if let Err(e) = output {
        eprintln!("Failed to execute patch script: {}", e);
        return Err(false);
    }

    let output = output.unwrap();
    if !output.status.success() {
        let stderr = String::from_utf8_lossy(&output.stderr);
        eprintln!("Script failed with error: {}", stderr);
        return Err(false);
    }

    fs::write(src_dir.join("aeropkg.applied-patch"), &patch_script).unwrap();

    Ok(())
}



fn build(
    repo: &String,
    pkgname: &String,
    src_dir: &Path,
    pkg_md_path: &Path,
) -> Result<(), bool> {
    let build_script = match parser::get_build_script(pkg_md_path) {
        Ok(script) => script,
        Err(error) => {
            eprintln!("Failed to parse build script: {}", error);
            return Err(false);
        }
    };

    if src_dir.join("aeropkg.applied-build").exists() {
        let src_build = fs::read_to_string(src_dir.join("aeropkg.applied-build")).unwrap_or("".to_string());
        if build_script == src_build {
            return Ok(())
        } else {
            println!("build:\n{}\nend build", build_script);
            println!("src build:\n{}\nend src build", src_build);
            fs::remove_dir_all(src_dir).unwrap();
            download(&pkgname, &pkg_md_path)?;
            patch(&pkgname, &src_dir, &pkg_md_path)?;
        }
    }

    let output = Command::new("zsh")
        .arg("-c")
        .arg(&build_script)
        .current_dir(src_dir)
        .output();

    if let Err(e) = output {
        eprintln!("Failed to execute build script: {}", e);
        return Err(false);
    }

    let output = output.unwrap();
    if !output.status.success() {
        let stderr = String::from_utf8_lossy(&output.stderr);
        eprintln!("Script failed with error:\n{}", stderr);
        std::process::exit(1);
    }

    let dest_dir = PathBuf::from("/pkg").join(repo).join(pkgname);
    if let Err(e) = fs::create_dir_all(&dest_dir) {
        eprintln!("Failed to create destination directory: {}", e);
        return Err(false);
    }

    let dest_path = dest_dir.join("build-script.md");
    fs::remove_file(&dest_path).expect("");
    if let Err(e) = fs::hard_link(pkg_md_path, &dest_path) {
        eprintln!("Failed to copy build script to destination: {}", e);
        return Err(false);
    }

    fs::write(src_dir.join("aeropkg.build-script"), &build_script).unwrap();

    Ok(())
}


fn config(
    src_dir: &Path,
    pkg_md_path: &Path
) -> Result<(), bool> {
    let config_script = match parser::get_config_script(pkg_md_path) {
        Ok(script) => script,
        Err(_) => { return Ok(()) }
    };

    let output = Command::new("zsh")
        .arg("-c")
        .arg(&config_script)
        .current_dir(src_dir)
        .output();

    if let Err(e) = output {
        eprintln!("Failed to execute config script: {}", e);
        return Err(false);
    }

    let output = output.unwrap();
    if !output.status.success() {
        let stderr = String::from_utf8_lossy(&output.stderr);
        eprintln!("Script failed with error: {}", stderr);
        return Err(false);
    }

    Ok(())
}

fn hook(repo: &String, pkgname: &String) {
    let pkg_dir = PathBuf::from("/pkg").join(&repo).join(&pkgname);
    let lib_dir = &pkg_dir.join("lib");
    let lib64_dir = &pkg_dir.join("lib64");
    let lib32_dir = &pkg_dir.join("lib32");
    crate::utils::mv::mv(&lib64_dir, &lib_dir).unwrap();
    crate::utils::mv::mv(&lib32_dir, &lib_dir).unwrap();
    fs::remove_dir_all(&lib64_dir).unwrap();
    fs::remove_dir_all(&lib32_dir).unwrap();
}