use std::net::Ipv4Addr;
use std::path::{Path, PathBuf};

use based::asset::AssetRoutes;
use based::auth::User;
use based::get_pg;
use based::ui::components::prelude::Shell;
use based::ui::prelude::*;
use cli::PaccoCLI;
use cmd_lib::{run_cmd, run_fun};
use config::Config;
use pacco::pkg::arch::Architecture;
use pacco::pkg::package::run_command;
use pacco::pkg::{Package, Repository};
use rocket::data::ToByteUnit;
use rocket::{routes, tokio};

pub mod cli;
pub mod config;
pub mod routes;

async fn launch(config: String) {
    env_logger::init();

    let pg = get_pg!();
    sqlx::migrate!("./migrations").run(pg).await.unwrap();

    let config: Config =
        toml::from_str(&std::fs::read_to_string(&config).unwrap_or_default()).unwrap_or_default();

    let _ = User::create("admin".to_string(), "admin", based::auth::UserRole::Admin).await;

    let shell = Shell::new(
        Nothing(),
        Nothing(),
        Background(MinHeight(
            ScreenValue::screen,
            Padding(Text("").color(&Gray::_200)).all(ScreenValue::_10),
        ))
        .color(Gray::_900),
    )
    .use_ui();

    rocket::build()
        .configure(rocket::Config {
            limits: rocket::data::Limits::new()
                .limit("bytes", 8.kibibytes())
                .limit("data-form", 10.gigabytes())
                .limit("file", 10.gigabytes())
                .limit("form", 32.kibibytes())
                .limit("json", 1.mebibytes())
                .limit("msgpack", 1.mebibytes())
                .limit("string", 8.kibibytes()),
            address: std::net::IpAddr::V4(Ipv4Addr::new(0, 0, 0, 0)),
            port: 8000,
            ..Default::default()
        })
        .mount_assets()
        .mount(
            "/",
            routes![
                routes::index_page,
                routes::pkg_route,
                routes::push::upload_pkg,
                routes::user::login,
                routes::user::login_post,
                routes::user::account_page,
                routes::ui::pkg_ui,
                routes::ui::repo_ui,
                routes::user::new_api_key,
                routes::user::end_session,
                routes::user::change_password,
                routes::user::change_password_post
            ],
        )
        .manage(config)
        .manage(shell)
        .launch()
        .await
        .unwrap();
}

use std::process::{Command, Stdio};

pub fn build(image: &str, ci: bool) {
    // Get current directory
    let current_dir = std::env::current_dir().expect("Failed to get current directory");
    let uid = nix::unistd::Uid::current().as_raw();

    let move_pkg = format!("rsync -a --chown={uid}:{uid} /build/*.pkg.tar.* /workdir/");

    let sign_key = std::env::var("SIGN_KEY");

    // Build the Docker command
    let mut docker_script = vec![
        "set -e".to_string(),
        "pacman -Syu --noconfirm".to_string(),
        "pacman -S --noconfirm rsync base-devel".to_string(),
    ];

    if ci {
        let symlink_cmd = format!(
            "ln -s {} /build",
            std::env::current_dir().unwrap().display()
        );
        docker_script.extend([symlink_cmd]);
    } else {
        docker_script.extend(["rsync -a /workdir/ /build/".to_string()]);
    };

    docker_script.extend([
        "useradd -m build".to_string(),
        "echo 'ALL ALL=(ALL) NOPASSWD: ALL' >> /etc/sudoers".to_string(),
        "chown -R build /build".to_string(),
    ]);

    if ci {
        if std::fs::exists("./pacman.conf").unwrap() {
            println!("-> Using custom pacman.conf");
            docker_script.extend(["cp -v ./workdir/pacman.conf /etc/pacman.conf".to_string()]);
        }

        if std::fs::exists("./makepkg.conf").unwrap() {
            println!("-> Using custom makepkg.conf");
            docker_script.extend(["cp -v ./workdir/pacman.conf /etc/makepkg.conf".to_string()]);
        }
    }

    if let Ok(sign_key) = sign_key {
        println!("Found signing key. Package will be signed.");
        let sign_key = sign_key.trim();
        let sign_key = sign_key.replace('\n', "\\n");
        let import_cmd = format!("echo -e '{sign_key}'|gpg --import");
        let import_cmd_user = format!("su build -c \"echo -e '{sign_key}'|gpg --import\"");
        let export_var_cmd = format!(
            "export GPGKEY=$(gpg --list-secret-keys --with-colons | awk -F: '/^fpr/ {{ print $10 }}'|head -n1)"
        );
        let trust_cmd = format!(
            "su build -w GPGKEY -c sh -c 'echo -e \"5\" | gpg --batch --yes --no-tty --command-fd 0 --edit-key $GPGKEY trust'"
        );
        docker_script.extend([
            import_cmd,
            import_cmd_user,
            export_var_cmd,
            trust_cmd,
            "su build -w GPGKEY -c 'cd /build && makepkg -s -C -c --skippgpcheck --sign --noconfirm'".to_string(),
        ]);
    } else {
        docker_script.extend([
            "su build -w GPGKEY -c 'cd /build && makepkg -c -C -s --noconfirm --skippgpcheck'"
                .to_string(),
        ]);
    }

    docker_script.extend([move_pkg]);

    // Build the Docker run command
    let status = if ci {
        Command::new("bash")
            .stderr(Stdio::inherit())
            .stdout(Stdio::inherit())
            .args([
                "-c",
                &format!("mkdir /build && {}", docker_script.join(";")),
            ])
            .status()
            .expect("Failed to run build")
    } else {
        // TODO : mount custom pacman.conf + makepkg.conf

        let workdir_vol = format!("{}:/workdir", current_dir.display());
        let mut args = vec![
            "run",
            "--rm", // Remove container after exit
            "-v",
            &workdir_vol, // Mount current dir to /workdir
        ];

        let mut extra_vols = Vec::new();

        if std::fs::exists("./pacman.conf").unwrap() {
            println!("-> Using custom pacman.conf");
            extra_vols.push(format!(
                "{}:/pacman.conf",
                current_dir.join("pacman.conf").display()
            ));
        }

        if std::fs::exists("./makepkg.conf").unwrap() {
            println!("-> Using custom makepkg.conf");
            extra_vols.push(format!(
                "{}:/makepkg.conf",
                current_dir.join("makepkg.conf").display()
            ));
        }

        for vol in &extra_vols {
            args.extend([vol.as_str()]);
        }

        let cmd = format!(
            // We mount /workdir and work inside the container
            "mkdir /build && {}",
            docker_script.join(";")
        );

        args.extend([
            "-w", "/workdir", // Set working directory
            image,      // Docker Base Image
            "bash", "-c", &cmd,
        ]);

        Command::new("docker")
            .stderr(Stdio::inherit())
            .stdout(Stdio::inherit())
            .args(args)
            .status()
            .expect("Failed to start Docker")
    };

    if !status.success() {
        eprintln!("Build failed with status: {:?}", status);
    }
}

pub fn find_package_files() -> Vec<String> {
    let output = Command::new("sh")
        .arg("-c")
        .arg("ls -1 *.pkg.tar.*")
        .output()
        .expect("failed to execute process");

    let res = String::from_utf8_lossy(&output.stdout).to_string();
    res.split("\n")
        .filter_map(|x| {
            let x = x.trim();
            if x.is_empty() {
                None
            } else {
                if x.ends_with(".sig") {
                    return None;
                }
                Some(x.to_string())
            }
        })
        .collect()
}

pub fn pacco_push(package: &str, repo: &str, signed: bool) {
    let pacco_domain = std::env::var("PACCO_HOST").unwrap();
    let pkg = package;
    let repo = repo;
    let pkgstr = format!("pkg=@{pkg}");
    let sigstr = format!("sig=@{pkg}.sig");
    let domainstr = format!("{pacco_domain}/pkg/{repo}/upload");
    let token = std::env::var("PACCO_TOKEN").unwrap();
    let tokenstr = format!("Token: {token}");
    println!("Pushing package {package} to {repo} @ {pacco_domain}");
    if signed {
        run_cmd!(curl -X POST -H $tokenstr -F $pkgstr -F $sigstr $domainstr).unwrap();
    } else {
        run_cmd!(curl -X POST -H $tokenstr -F $pkgstr $domainstr).unwrap();
    }
}

#[tokio::main]
async fn main() {
    let cli: PaccoCLI = argh::from_env();
    match cli.cmd {
        cli::PaccoCLICommands::Serve(serve_command) => {
            launch(serve_command.config.unwrap_or("config.toml".to_string())).await;
        }
        cli::PaccoCLICommands::Build(build_command) => {
            // todo : check for presence of pkgbuild
            build(&build_command.image, build_command.ci);
            let pkgs = find_package_files();
            for pkg in &pkgs {
                println!("-> Successfully built {pkg}");
            }

            if let Some(push) = build_command.push {
                for pkg in &pkgs {
                    pacco_push(pkg, &push, std::env::var("SIGN_KEY").is_ok());
                }
            }

            if let Some(out) = build_command.out {
                for pkg in &pkgs {
                    run_cmd!(mv -v $pkg $out).unwrap();
                    if std::env::var("SIGN_KEY").is_ok() {
                        let sig = format!("{pkg}.sig");
                        run_cmd!(mv -v $sig $out).unwrap();
                    }
                }
            }
        }
        cli::PaccoCLICommands::Package(package_command) => match package_command.cmd {
            cli::PackageCommands::Init(package_init_command) => {
                std::fs::copy("/usr/share/pacman/PKGBUILD.proto", "PKGBUILD").unwrap();
            }
            cli::PackageCommands::Info(package_info_command) => {
                run_cmd!(makepkg - -printsrcinfo - -sync).unwrap();
            }
            cli::PackageCommands::Push(package_push_command) => {
                pacco_push(
                    &package_push_command.package,
                    &package_push_command.repo,
                    package_push_command.signed,
                );
            }
        },
        cli::PaccoCLICommands::Repo(repo_command) => {
            match repo_command.cmd {
                cli::RepoCommands::Add(repo_add) => {
                    let pkg = repo_add.package;

                    let pkg_filename = Path::new(&pkg).file_name().unwrap().to_str().unwrap();
                    let (_, _, _, arch, _) = Package::extract_pkg_name(pkg_filename).unwrap();

                    let repo = Repository::new_at(
                        &infer_repo(&repo_add.repo.unwrap_or(".".to_string()))
                            .expect("No repository found"),
                    );

                    println!("Using repository {:?}", repo.directory);

                    if matches!(arch, Architecture::any) {
                        let archs = repo.arch();
                        for a in archs {
                            let db = repo.db_path(a);
                            run_cmd!(repo-add $db $pkg).unwrap();
                        }
                    } else {
                        let db = repo.db_path(arch);
                        run_cmd!(repo-add $db $pkg).unwrap();
                    }
                }
                cli::RepoCommands::Rm(repo_rm) => {
                    let pkg = repo_rm.package;

                    let pkg_filename = Path::new(&pkg).file_name().unwrap().to_str().unwrap();
                    let (pkg_name, _, _, arch, _) =
                        Package::extract_pkg_name(pkg_filename).unwrap();

                    let repo = Repository::new_at(
                        &infer_repo(&repo_rm.repo.unwrap_or(".".to_string()))
                            .expect("No repository found"),
                    );

                    println!("Using repository {:?}", repo.directory);

                    let archs = repo.arch();
                    for a in archs {
                        let db = repo.db_path(a);
                        run_cmd!(repo-remove $db $pkg_name).unwrap();
                    }
                }
                cli::RepoCommands::Init(repo_init) => {
                    let archs: Vec<_> = repo_init
                        .arch
                        .into_iter()
                        .map(|x| Architecture::parse(&x).expect("no valid arch"))
                        .collect();
                    let archs = if archs.is_empty() {
                        println!(
                            "No architectures specified. Using {}",
                            Architecture::own().to_string()
                        );
                        vec![Architecture::own()]
                    } else {
                        archs
                    };

                    Repository::create_at(
                        std::env::current_dir().unwrap().join(&repo_init.name),
                        archs,
                    );
                }
                cli::RepoCommands::Index(repo_index) => {
                    // reindex all packages
                    let repo = Repository::new_at(
                        &infer_repo(&repo_index.repo.unwrap_or(".".to_string()))
                            .expect("No repository found"),
                    );

                    for arch in repo.arch() {
                        // todo : implement
                    }
                }
            }
        }
    }
}

/// Checks if the given directory is a repo base by looking for known arch subdirectories.
fn is_repo_base(path: &Path) -> bool {
    let arch_dirs = ["x86_64", "aarch64", "any"];
    arch_dirs.iter().any(|dir| path.join(dir).is_dir())
}

/// Infers the base path of a repository from any path within it.
/// Searches upward for up to 4 levels, looking for a folder containing known arch dirs.
pub fn infer_repo(path: &str) -> Option<String> {
    let mut current = Path::new(path)
        .canonicalize()
        .unwrap_or_else(|_| PathBuf::from(path));
    let mut steps = 0;

    while current.exists() && steps < 4 {
        if is_repo_base(&current) {
            return Some(current.to_string_lossy().to_string());
        }
        if let Some(parent) = current.parent() {
            current = parent.to_path_buf();
            steps += 1;
        } else {
            break;
        }
    }

    None
}