use std::path::{Path, PathBuf};
use std::fs;
use std::io;
use image::open as image_open;
use image::{FilterType, GenericImage, ImageError, ImageFormat};
use rexif::{self, ExifData};

use rphotos::models::Photo;

pub struct PhotosDir {
    basedir: PathBuf,
}

impl PhotosDir {
    pub fn new(basedir: PathBuf) -> Self {
        PhotosDir { basedir: basedir }
    }

    #[allow(dead_code)]
    pub fn get_scaled_image(&self,
                            photo: Photo,
                            width: u32,
                            height: u32)
                            -> Result<Vec<u8>, ImageError> {
        let path = self.basedir.join(photo.path);
        info!("Should open {:?}", path);
        let img = try!(image_open(path));
        let img = if width < img.width() || height < img.height() {
            img.resize(width, height, FilterType::CatmullRom)
        } else {
            img
        };
        let img = match photo.rotation {
            _x @ 0...44 => img,
            _x @ 45...134 => img.rotate90(),
            _x @ 135...224 => img.rotate180(),
            _x @ 225...314 => img.rotate270(),
            _x @ 315...360 => img,
            x => {
                warn!("Should rotate photo {} deg, which is unsupported", x);
                img
            }
        };
        // TODO Put the icon in some kind of cache!
        let mut buf = Vec::new();
        try!(img.save(&mut buf, ImageFormat::JPEG));
        Ok(buf)
    }

    #[allow(dead_code)]
    pub fn find_files(&self,
                      dir: &Path,
                      cb: &Fn(&str, &ExifData))
                      -> io::Result<()> {
        let absdir = self.basedir.join(dir);
        if try!(fs::metadata(&absdir)).is_dir() {
            let bl = self.basedir.to_str().unwrap().len() + 1;
            debug!("Should look in {:?}", absdir);
            for entry in try!(fs::read_dir(absdir)) {
                let entry = try!(entry);
                if try!(fs::metadata(entry.path())).is_dir() {
                    try!(self.find_files(&entry.path(), cb));
                } else {
                    let p1 = entry.path();
                    if let Ok(exif) = rexif::parse_file(&p1.to_str().unwrap()) {
                        let path = p1.to_str().unwrap();
                        cb(&path[bl..], &exif);
                    }
                }
            }
        }
        Ok(())
    }
}