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use super::{image::QEMU_IMG_DEFAULT_FORMAT, traits::ConfigStorageHandler, vm::VM};
use crate::util::path_exists;
use anyhow::{anyhow, Result};
use std::{path::PathBuf, sync::Arc};

#[derive(Debug, Clone)]
pub struct XDGConfigStorage {
    base: PathBuf,
}

impl Default for XDGConfigStorage {
    fn default() -> Self {
        let dir = dirs::data_dir().unwrap_or(dirs::home_dir().unwrap());
        let root = dir.join("emu");

        std::fs::create_dir_all(root.clone()).unwrap_or(());

        Self { base: root }
    }
}

impl ConfigStorageHandler for XDGConfigStorage {
    fn rename(&self, old: &VM, new: &VM) -> Result<()> {
        Ok(std::fs::rename(self.vm_root(old), self.vm_root(new))?)
    }

    fn vm_root(&self, vm: &VM) -> PathBuf {
        self.base_path().join(vm.name())
    }

    fn vm_list(&self) -> Result<Vec<VM>> {
        match std::fs::read_dir(self.base_path()) {
            Ok(rd) => {
                let mut ret = Vec::new();
                for dir in rd {
                    match dir {
                        Ok(dir) => match dir.file_name().into_string() {
                            Ok(s) => ret.push(VM::new(s, Arc::new(Box::new(self.clone())))),
                            Err(_) => {
                                return Err(anyhow!(
                                "could not iterate base directory; some vm filenames are invalid"
                            ))
                            }
                        },
                        Err(e) => return Err(anyhow!("could not iterate directory: {}", e)),
                    }
                }

                Ok(ret)
            }
            Err(e) => Err(anyhow!(e)),
        }
    }

    fn vm_path(&self, vm: &VM, filename: &str) -> PathBuf {
        self.vm_root(vm).join(filename)
    }

    fn vm_path_exists(&self, vm: &VM, filename: &str) -> bool {
        path_exists(self.vm_path(vm, filename))
    }

    fn pidfile(&self, vm: &VM) -> PathBuf {
        self.vm_path(&vm, "pid")
    }

    fn base_path(&self) -> PathBuf {
        self.base.clone()
    }

    fn vm_exists(&self, vm: &VM) -> bool {
        path_exists(self.vm_root(vm))
    }

    fn disk_list(&self, vm: &VM) -> Result<Vec<PathBuf>> {
        if !self.vm_exists(vm) {
            return Err(anyhow!("vm does not exist"));
        }

        let mut v = Vec::new();

        let dir = std::fs::read_dir(self.vm_root(vm))?;
        for item in dir {
            if let Ok(item) = item {
                if item
                    .path()
                    .to_str()
                    .unwrap()
                    .ends_with(&format!(".{}", QEMU_IMG_DEFAULT_FORMAT))
                {
                    v.push(item.path());
                }
            }
        }

        v.sort();

        Ok(v)
    }

    fn config_path(&self, vm: &VM) -> PathBuf {
        self.vm_path(vm, "config")
    }

    fn monitor_path(&self, vm: &VM) -> PathBuf {
        self.vm_path(vm, "mon")
    }

    fn write_config(&self, vm: VM) -> Result<()> {
        vm.config().to_file(self.config_path(&vm))
    }

    fn size(&self, vm: &VM) -> Result<usize> {
        let dir = std::fs::read_dir(self.vm_root(vm))?;
        let mut total = 0;
        let mut items = Vec::new();
        let mut dirs = vec![dir];
        while let Some(dir) = dirs.pop() {
            for item in dir {
                match item {
                    Ok(item) => {
                        let meta = item.metadata()?;
                        if meta.is_file() {
                            items.push(item);
                        }
                    }
                    _ => {}
                }
            }
        }

        for item in items {
            let meta = item.metadata()?;
            total += meta.len() as usize;
        }

        Ok(total)
    }
}