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use crate::error::OciSpecError;
use derive_builder::Builder;
use getset::{CopyGetters, Getters, MutGetters, Setters};
use serde::{Deserialize, Serialize};
use std::path::PathBuf;

#[derive(
    Builder, Clone, CopyGetters, Debug, Deserialize, Eq, Getters, Setters, PartialEq, Serialize,
)]
#[builder(
    default,
    pattern = "owned",
    setter(into, strip_option),
    build_fn(error = "OciSpecError")
)]
/// Root contains information about the container's root filesystem on the
/// host.
pub struct Root {
    /// Path is the absolute path to the container's root filesystem.
    #[serde(default)]
    #[getset(get = "pub", set = "pub")]
    path: PathBuf,

    /// Readonly makes the root filesystem for the container readonly before
    /// the process is executed.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    #[getset(get_copy = "pub", set = "pub")]
    readonly: Option<bool>,
}

/// Default path for container root is "./rootfs" from config.json, with
/// readonly true
impl Default for Root {
    fn default() -> Self {
        Root {
            path: PathBuf::from("rootfs"),
            readonly: true.into(),
        }
    }
}

#[derive(
    Builder,
    Clone,
    Debug,
    Default,
    Deserialize,
    Eq,
    Getters,
    MutGetters,
    Setters,
    PartialEq,
    Serialize,
)]
#[builder(
    default,
    pattern = "owned",
    setter(into, strip_option),
    build_fn(error = "OciSpecError")
)]
#[getset(get_mut = "pub", get = "pub", set = "pub")]
/// Mount specifies a mount for a container.
pub struct Mount {
    /// Destination is the absolute path where the mount will be placed in
    /// the container.
    destination: PathBuf,

    #[serde(default, skip_serializing_if = "Option::is_none", rename = "type")]
    /// Type specifies the mount kind.
    typ: Option<String>,

    #[serde(default, skip_serializing_if = "Option::is_none")]
    /// Source specifies the source path of the mount.
    source: Option<PathBuf>,

    #[serde(default, skip_serializing_if = "Option::is_none")]
    /// Options are fstab style mount options.
    options: Option<Vec<String>>,
}

/// utility function to generate default config for mounts.
pub fn get_default_mounts() -> Vec<Mount> {
    vec![
        Mount {
            destination: PathBuf::from("/proc"),
            typ: "proc".to_string().into(),
            source: PathBuf::from("proc").into(),
            options: None,
        },
        Mount {
            destination: PathBuf::from("/dev"),
            typ: "tmpfs".to_string().into(),
            source: PathBuf::from("tmpfs").into(),
            options: vec![
                "nosuid".into(),
                "strictatime".into(),
                "mode=755".into(),
                "size=65536k".into(),
            ]
            .into(),
        },
        Mount {
            destination: PathBuf::from("/dev/pts"),
            typ: "devpts".to_string().into(),
            source: PathBuf::from("devpts").into(),
            options: vec![
                "nosuid".into(),
                "noexec".into(),
                "newinstance".into(),
                "ptmxmode=0666".into(),
                "mode=0620".into(),
                "gid=5".into(),
            ]
            .into(),
        },
        Mount {
            destination: PathBuf::from("/dev/shm"),
            typ: "tmpfs".to_string().into(),
            source: PathBuf::from("shm").into(),
            options: vec![
                "nosuid".into(),
                "noexec".into(),
                "nodev".into(),
                "mode=1777".into(),
                "size=65536k".into(),
            ]
            .into(),
        },
        Mount {
            destination: PathBuf::from("/dev/mqueue"),
            typ: "mqueue".to_string().into(),
            source: PathBuf::from("mqueue").into(),
            options: vec!["nosuid".into(), "noexec".into(), "nodev".into()].into(),
        },
        Mount {
            destination: PathBuf::from("/sys"),
            typ: "sysfs".to_string().into(),
            source: PathBuf::from("sysfs").into(),
            options: vec![
                "nosuid".into(),
                "noexec".into(),
                "nodev".into(),
                "ro".into(),
            ]
            .into(),
        },
        Mount {
            destination: PathBuf::from("/sys/fs/cgroup"),
            typ: "cgroup".to_string().into(),
            source: PathBuf::from("cgroup").into(),
            options: vec![
                "nosuid".into(),
                "noexec".into(),
                "nodev".into(),
                "relatime".into(),
                "ro".into(),
            ]
            .into(),
        },
    ]
}

/// utility function to generate default rootless config for mounts.
pub fn get_rootless_mounts() -> Vec<Mount> {
    let mut mounts = get_default_mounts();
    mounts
        .iter_mut()
        .find(|m| m.destination.to_string_lossy() == "/dev/pts")
        .map(|m| {
            if let Some(opts) = &mut m.options {
                opts.retain(|o| o != "gid=5")
            }
            m
        });
    mounts
        .iter_mut()
        .find(|m| m.destination.to_string_lossy() == "/sys")
        .map(|m| {
            m.typ = Some("none".to_string());
            m.source = Some("/sys".into());
            if let Some(o) = m.options.as_mut() {
                o.push("rbind".to_string())
            }
            m
        });
    mounts
}