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extern crate byteorder;
#[macro_use]
extern crate enum_primitive;
extern crate num;

use num::FromPrimitive;

use byteorder::{ReadBytesExt, WriteBytesExt, BigEndian, LittleEndian};
use std::io::{Read, Seek};
use std::collections::{HashMap, HashSet};
use std::io::Result;
use std::fmt;

mod lowlevel;
mod reader;
pub mod tiff;

use tiff::*;
use reader::*;
pub use tiff::TIFF;

/// The GeoTIFF library reads `.tiff` files.
///
/// It is primarily used within a routing application that needs to parse digital elevation models.
/// As such, other use cases are NOT tested (for now).
impl TIFF {
    /// Opens a `.tiff` file at the location indicated by `filename`.
    pub fn open(filename: &str) -> Result<Box<TIFF>> {
        let tiff_reader = TIFFReader;
        tiff_reader.load(filename)
    }

    /// Gets the value at a given coordinate (in pixels).
    pub fn get_value_at(&self, lon: usize, lat: usize) -> usize {
        self.image_data[lon][lat][0]
    }
}

/// Overwrite default display function.
impl fmt::Display for TIFF {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "TIFF(Image size: [{}, {}, {}], Tag data: {:?})",
               self.image_data.len(), self.image_data[0].len(),
               self.image_data[0][0].len(), self.ifds)
    }
}