//! Example of how to use the raw bindings
//!

extern crate failure;
extern crate openslide;

use openslide::{bindings, utils};
use std::path::Path;
use failure::Error;

fn basic_usage(
    filename: &str
) -> Result<(), Error> {

    let vendor = bindings::detect_vendor(filename)?;
    println!("Vendor: {}", vendor);

    let osr = bindings::open(filename)?;

    let levels = bindings::get_level_count(osr)?;
    println!("Slide has {} levels", levels);

    let (height, width) = bindings::get_level0_dimensions(osr)?;
    println!("Slide has dimension {} x {} at level 0", height, width);

    let level = 0;
    let (height, width) = bindings::get_level_dimensions(osr, level)?;
    println!("Slide has dimension {} x {} at level {}", height, width, level);

    let factor = bindings::get_level_downsample(osr, level)?;
    println!("Slide at level {} is downsampled with factor {}", level, factor);

    let downsample_factor = 5.6;
    let level = bindings::get_best_level_for_downsample(osr, downsample_factor)?;
    println!("Best level for downsample factor {} is {}", downsample_factor, level);

    let x = 1000;
    let y = 1500;
    let level = 0;
    let h = 512;
    let w = 512;
    let word_repr = utils::WordRepresentation::BigEndian;
    let buffer = bindings::read_region(osr, x, y, level, w, h)?;
    let im = utils::decode_buffer(&buffer, h as u32, w as u32, word_repr)?;
    im.save(Path::new("/tmp/wsi_region_1.png"))?;
    println!("Region is written");

    // Test error
    //let factor = bindings::get_level_downsample(osr, 2)?;
    //println!("{:?}", bindings::get_error(osr));

    bindings::close(osr);

    Ok(())
}

fn properties(
    filename: &str
) -> Result<(), Error> {
    let osr = bindings::open(filename)?;

    println!("Slide in {} has the following properties:", filename);
    println!("{0:<40} {1}", "Property key", "Property value");
    for name in bindings::get_property_names(osr)? {
        println!("{0:<40} {1}", name, bindings::get_property_value(osr, &name)?);
    }

    bindings::close(osr);
    Ok(())
}

fn main() {
    let filename = "assets/CMU-1-Small-Region.svs";
    println!("Analyzing {}", filename);

    match basic_usage(filename) {
        Ok(_) => println!("Basic usage functions are working okay"),
        Err(msg) => {
            println!("Basic usage functions not working");
            println!("{}", msg);
        },
    }

    match properties(filename) {
        Ok(_) => println!("Property functions are working okay"),
        Err(msg) => {
            println!("Property functions not working");
            println!("{}", msg);
        },
    }

    println!("Example program is terminated");
}