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use crate::config::CONFIG_INSTANCE;
use crate::constants::{PHOTO_BASE_XY, PHOTO_FULLSIZE_XY, PHOTO_THUMBNAIL_XY};
use crate::error::DichroismError;
use crate::models::{Photo, PhotoSet};
use base64::decode;
use image::imageops::FilterType;
use image::DynamicImage;
use image::GenericImageView;
use once_cell::sync::Lazy;
use regex::Regex;
use std::path::PathBuf;
use uuid::Uuid;
static DATA_URI_RE: Lazy<Regex> = Lazy::new(|| {
Regex::new("^data:image/(png|jpeg);base64,(?P<data>.+)")
.expect("Couldn't parse data URI Regex.")
});
pub fn generate_photo_set(uri: &str) -> Result<PhotoSet, DichroismError> {
let data = DATA_URI_RE
.captures(uri)
.ok_or_else(|| DichroismError::UriDataExtract("Failed to parse URI".to_string()))?
.name("data")
.ok_or_else(|| DichroismError::UriDataExtract("Failed to extract data".to_string()))?
.as_str();
let original = image::load_from_memory(&decode(data)?)?;
let fullsize = original.resize(PHOTO_FULLSIZE_XY, PHOTO_FULLSIZE_XY, FilterType::Lanczos3);
let base = original.resize(PHOTO_BASE_XY, PHOTO_BASE_XY, FilterType::Lanczos3);
let (width, height) = original.dimensions();
let thumbnail = if width > height {
let offset = (width - height) / 2;
original.crop_imm(offset, 0, width - offset * 2, height)
} else {
let offset = (height - width) / 2;
original.crop_imm(0, offset, width, height - offset * 2)
}
.resize(PHOTO_THUMBNAIL_XY, PHOTO_THUMBNAIL_XY, FilterType::Lanczos3);
Ok(PhotoSet {
id: None,
original: generate_photo(&original)?,
fullsize: generate_photo(&fullsize)?,
base: generate_photo(&base)?,
thumbnail: generate_photo(&thumbnail)?,
})
}
fn generate_photo(image: &DynamicImage) -> Result<Photo, DichroismError> {
let base_name = Uuid::new_v3(&Uuid::NAMESPACE_OID, &image.to_bytes())
.to_hyphenated()
.to_string();
let mut path = PathBuf::from(&CONFIG_INSTANCE.img_root);
path.push(base_name);
path.set_extension("jpg");
image.save(&path)?;
let id = path
.file_name()
.ok_or_else(|| {
DichroismError::ImageWrite("Error extracting filename from path".to_string())
})?
.to_str()
.ok_or_else(|| {
DichroismError::ImageWrite("Error converting filename to slice".to_string())
})?;
Ok(Photo::new(String::from(id)))
}
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