use std::path::{PathBuf, Path};
use std::fs;
use std::os::unix::fs::MetadataExt;
use std::ffi::OsString;
use std::collections::HashMap;

//use crate::log;

#[derive(Debug)]
pub struct Entry {
    base_dir: PathBuf,
    pub name: OsString
}

#[derive(Debug)]
pub struct Task {
    pub name: OsString,
    pub bin: PathBuf,
    pub source: Option<String>,
    pub dvcs: Option<String>,
    pub config: HashMap<String, String>,
    pub branch: Option<String>,
    pub host: Option<String>,
    pub cloned: bool,
}

impl Task {
    pub fn new(base_dir: PathBuf, name: OsString) -> Task {
        let t = Entry::new(base_dir, name.clone());
        let source = t.source();
        let cloned = source.clone().map_or(false, |src| {
            let mut path = t.base_dir.clone();
            path.push(format!(".{}", t.name.to_str().expect("WTF")));
            path.is_dir()
        });
        Task {
            name: name.clone(),
            bin: PathBuf::from(name.clone()),
            source,
            dvcs: t.dvcs(),
            config: HashMap::new(),
            branch: t.branch(),
            host: t.host(),
            cloned,

        }
    }
}

impl Entry {
    pub fn new(base_dir: PathBuf, name: OsString) -> Entry {
        Entry {
            base_dir,
            name
        }
    }

    fn read_setting(&self, setting: &str) -> Option<String> {
        let mut path = self.base_dir.clone();
        path.push(&self.name);
        path.set_extension(setting);
        read_or_none(&path)
    }

    pub fn source(&self) -> Option<String> {
        self.read_setting("source")
    }

    pub fn dvcs(&self) -> Option<String> {
        self.read_setting("dvcs")
    }

    pub fn branch(&self) -> Option<String> {
        self.read_setting("branch")
    }

    pub fn host(&self) -> Option<String> {
        self.read_setting("branch")
    }

    pub fn has_dir(&self, name: &str) -> bool {
        let mut path = self.base_dir.clone();
        path.push(name);
        return path.is_dir();
    }
}

pub struct Database {
    base_dir: PathBuf
}

impl Database {
    pub fn from_folder(p: &str) -> Database {
        let path = PathBuf::from(&p);
        if !path.is_dir() {
            panic!("Folder {} not found", &p);
        }
        Database {
            base_dir: path
        }
    }

    pub fn tasks(&self) -> Vec<Task> {
        // If database doesn't exist, simply return an empty vec
        let mut res = Vec::new();
        for file in list_files(&self.base_dir) {
            if is_executable(&file) {
                res.push(
                    Task::new(self.base_dir.clone(), file.file_name().expect("WTF").to_os_string())
                );
            }
            println!("{:?}", file);
        }
        
        return res;
    }

    pub fn task(&self, name: &str) -> Option<Task> {
        let mut path = self.base_dir.clone();
        path.push(name);
        if !path.is_file() {
            return None;
        }

        return Some(
            Task::new(self.base_dir.clone(), path.file_name().expect("WTF").to_os_string())
        );
    }


}

/// Reads the file and strips whitespace (newline including)
/// Useful for file-based key-value store
fn read_or_none(path: &Path) -> Option<String> {
    if !path.is_file() {
        return None;
    }
    match fs::read_to_string(path) {
        Ok(content) => {
            // Remove trailing space/newlines
            Some(content.trim().to_string())
        },
        Err(e) => {
            eprintln!("IO ERROR: {}", e);
            None
        }
    }

}

fn list_files(path: &Path) -> Vec<PathBuf> {
    let mut res = Vec::new();
    match fs::read_dir(path) {
        Ok(files) => {
            for r in files {
                match r {
                    Ok(entry) => {
                        let file = entry.path();
                        if file.is_file() {
                            res.push(file);
                        }
                    },
                    Err(e) => {
                        eprintln!("IOERROR: {}", e)
                    }
                }
            }
        },
        Err(e) => {
            eprintln!("IOERROR: {}", e);
        }
    }
    return res;
}


// If the file doesn't exist or fails, return false
fn is_executable(path: &Path) -> bool {
    match fs::metadata(path) {
        Ok(stat) => {
            let mode = stat.mode();
            // Check user exec permission)
            if (mode & 0o100) == 0o100 {
                true
            } else {
                false
            }
        },
        Err(e) => {
            eprintln!("IO Error: {}", e);
            false
        }
    }
}