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use std::path::{PathBuf, Path};
use std::fs;
use std::io;
use std::io::{Read, Seek};
use image::io::Reader as ImageReader;
use image::error::ImageError;
use image::imageops;
use serde::Serialize;
use chrono::naive::NaiveDateTime;
use crate::context::Context;
#[derive(Debug, thiserror::Error)]
pub enum LoadError {
#[error("not a valid path: `{0}`")]
PathError(String),
#[error("loading configuration file")]
Io {
#[from]
source: io::Error,
},
#[error("parsing exif data")]
ExifParser {
#[from]
source: exif::Error,
},
#[error("parsing taken datetime")]
ExifTimestamp {
#[from]
source: chrono::ParseError,
},
}
#[derive(Debug, thiserror::Error)]
pub enum ConversionError {
#[error("reading picture from file")]
Io {
#[from]
source: io::Error,
},
#[error("loading image")]
Image {
#[from]
source: ImageError,
},
}
#[derive(Debug, Serialize)]
pub struct Picture {
taken: Option<String>,
hash: String,
pub path: PathBuf,
pub file_name: String,
#[serde(skip)]
pub taken_chrono: Option<NaiveDateTime>,
}
pub struct Converter<'a> {
imgdata: Option<image::DynamicImage>,
pic: &'a Picture,
}
fn hash_reader<R: Read>(reader: &mut R) -> Result<String, io::Error> {
let mut hash = md5::Context::new();
let mut buff = [0; 1024];
loop {
let count = reader.read(&mut buff)?;
if count == 0 {
// Reached end, stopping
break
}
hash.consume(&buff[..count])
}
Ok(format!("{:?}", hash.compute()))
}
impl Picture {
/// Hash file content and load exif data.
pub fn new_from_file(path: &Path) -> Result<Self, LoadError> {
let file = fs::File::open(path)?;
let mut reader = io::BufReader::new(&file);
let taken = match exif::Reader::new().read_from_container(&mut reader) {
Ok(exif) => exif.get_field(exif::Tag::DateTimeOriginal, exif::In::PRIMARY)
.map(|field| field.display_value().with_unit(&exif).to_string()),
Err(err) => {
println!("Could not load exif data for {}: {}", path.to_str().unwrap(), err);
None
}
};
let taken = taken.map(|taken|
NaiveDateTime::parse_from_str(&taken, "%Y-%m-%d %H:%M:%S")
).transpose()?;
// Move back to start of file for hashing
reader.seek(io::SeekFrom::Start(0))?;
Ok(Picture {
taken_chrono: taken,
taken: taken.map(|taken| taken.format("%Y-%m-%d").to_string()),
hash: hash_reader(&mut reader)?,
path: path.to_path_buf(),
file_name: match path.file_name() {
Some(fname) => Ok(fname.to_string_lossy().to_string()),
None => Err(LoadError::PathError(path.to_string_lossy().to_string())),
}?,
})
}
pub fn convert(&self) -> Result<Converter, ConversionError> {
Ok(Converter {
imgdata: None,
pic: self,
})
}
}
impl Converter<'_> {
fn convert_image(&mut self, size: u32, dest: &Path) -> Result<(), ImageError> {
let scaled = self.get_imgdata()?.resize(
size,
std::u32::MAX,
imageops::FilterType::Lanczos3);
scaled.save(dest)
}
fn get_imgdata(&mut self) -> Result<&image::DynamicImage, ImageError> {
let picpath = &self.pic.path;
match self.imgdata {
None => self.imgdata = Some(
ImageReader::open(picpath)?.decode()?
),
_ => ()
}
Ok(self.imgdata.as_ref().unwrap())
}
pub fn get_size(&mut self, ctx: &Context, size: u32) -> Result<PathBuf, ImageError> {
let hash = md5::compute(format!("{},{},{}", size, ctx.options.ext, self.pic.hash));
let name = format!("{:?}.{}", hash, ctx.options.ext);
let path = ctx.imgdir.join(name);
match path.exists() {
true => {
println!("Image of size {} already exists", size);
Ok(path)
},
false => {
println!("Scaling image to size {}", size);
self.convert_image(size, &path)?;
Ok(path)
}
}
}
}
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