# emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
# vi: set ft=python sts=4 ts=4 sw=4 et:
import os
from tempfile import mkstemp, mkdtemp

from nipype.testing import assert_equal, assert_true, assert_false
from nipype.utils.filemanip import (save_json, load_json, loadflat,
                                    fname_presuffix, fnames_presuffix,
                                    hash_rename, check_forhash,
                                    copyfile, copyfiles,
                                    filename_to_list, list_to_filename,
                                    cleandir, split_filename)

import numpy as np

def test_split_filename():
    res = split_filename('foo.nii')
    yield assert_equal, res, ('', 'foo', '.nii')
    res = split_filename('foo.nii.gz')
    yield assert_equal, res, ('', 'foo', '.nii.gz')
    res = split_filename('/usr/local/foo.nii.gz')
    yield assert_equal, res, ('/usr/local', 'foo', '.nii.gz')
    res = split_filename('../usr/local/foo.nii')
    yield assert_equal, res, ('../usr/local', 'foo', '.nii')
    res = split_filename('/usr/local/foo.a.b.c.d')
    yield assert_equal, res, ('/usr/local', 'foo.a.b.c', '.d')

def test_fname_presuffix():
    fname = 'foo.nii'
    pth = fname_presuffix(fname, 'pre_', '_post', '/tmp')
    yield assert_equal, pth, '/tmp/pre_foo_post.nii'
    fname += '.gz'
    pth = fname_presuffix(fname, 'pre_', '_post', '/tmp')
    yield assert_equal, pth, '/tmp/pre_foo_post.nii.gz'
    pth = fname_presuffix(fname, 'pre_', '_post', '/tmp', use_ext=False)
    yield assert_equal, pth, '/tmp/pre_foo_post'

def test_fnames_presuffix():
    fnames = ['foo.nii', 'bar.nii']
    pths = fnames_presuffix(fnames, 'pre_', '_post', '/tmp')
    yield assert_equal, pths, ['/tmp/pre_foo_post.nii', '/tmp/pre_bar_post.nii']

def test_hash_rename():
    new_name = hash_rename('foobar.nii', 'abc123')
    yield assert_equal, new_name, 'foobar_0xabc123.nii'
    new_name = hash_rename('foobar.nii.gz', 'abc123')
    yield assert_equal, new_name, 'foobar_0xabc123.nii.gz'

def test_check_forhash():
    fname = 'foobar'
    orig_hash = '_0x4323dbcefdc51906decd8edcb3327943'
    hashed_name = ''.join((fname, orig_hash, '.nii'))
    result, hash = check_forhash(hashed_name)
    yield assert_true, result
    yield assert_equal, hash, [orig_hash]
    result, hash = check_forhash('foobar.nii')
    yield assert_false, result
    yield assert_equal, hash, None

def _temp_analyze_files():
    """Generate temporary analyze file pair."""
    fd, orig_img = mkstemp(suffix = '.img')
    orig_hdr = orig_img[:-4] + '.hdr'
    fp = file(orig_hdr, 'w+')
    fp.close()
    return orig_img, orig_hdr

def test_copyfile():
    orig_img, orig_hdr = _temp_analyze_files()
    pth, fname = os.path.split(orig_img)
    new_img = os.path.join(pth, 'newfile.img')
    new_hdr = os.path.join(pth, 'newfile.hdr')
    copyfile(orig_img, new_img)
    yield assert_true, os.path.exists(new_img)
    yield assert_true, os.path.exists(new_hdr)
    os.unlink(new_img)
    os.unlink(new_hdr)
    # final cleanup
    os.unlink(orig_img)
    os.unlink(orig_hdr)

def test_copyfile_true():
    orig_img, orig_hdr = _temp_analyze_files()
    pth, fname = os.path.split(orig_img)
    new_img = os.path.join(pth, 'newfile.img')
    new_hdr = os.path.join(pth, 'newfile.hdr')
    # Test with copy=True
    copyfile(orig_img, new_img, copy=True)
    yield assert_true, os.path.exists(new_img)
    yield assert_true, os.path.exists(new_hdr)
    os.unlink(new_img)
    os.unlink(new_hdr)
    # final cleanup
    os.unlink(orig_img)
    os.unlink(orig_hdr)

def test_copyfiles():
    orig_img1, orig_hdr1 = _temp_analyze_files()
    orig_img2, orig_hdr2 = _temp_analyze_files()
    pth, fname = os.path.split(orig_img1)
    new_img1 = os.path.join(pth, 'newfile.img')
    new_hdr1 = os.path.join(pth, 'newfile.hdr')
    pth, fname = os.path.split(orig_img2)
    new_img2 = os.path.join(pth, 'secondfile.img')
    new_hdr2 = os.path.join(pth, 'secondfile.hdr')
    newfiles = copyfiles([orig_img1, orig_img2], [new_img1, new_img2])
    yield assert_true, os.path.exists(new_img1)
    yield assert_true, os.path.exists(new_hdr1)
    yield assert_true, os.path.exists(new_img2)
    yield assert_true, os.path.exists(new_hdr2)
    # cleanup
    os.unlink(orig_img1)
    os.unlink(orig_hdr1)
    os.unlink(orig_img2)
    os.unlink(orig_hdr2)
    os.unlink(new_img1)
    os.unlink(new_hdr1)
    os.unlink(new_img2)
    os.unlink(new_hdr2)

def test_filename_to_list():
    x = filename_to_list('foo.nii')
    yield assert_equal, x, ['foo.nii']
    x = filename_to_list(['foo.nii'])
    yield assert_equal, x, ['foo.nii']
    x = filename_to_list(('foo', 'bar'))
    yield assert_equal, x, ['foo', 'bar']
    x = filename_to_list(12.34)
    yield assert_equal, x, None

def test_list_to_filename():
    x = list_to_filename(['foo.nii'])
    yield assert_equal, x, 'foo.nii'
    x = list_to_filename(['foo', 'bar'])
    yield assert_equal, x, ['foo', 'bar']

def test_cleandir():
    filetypes = ['*.nii','*.nii.gz','*.txt','*.img','*.hdr','*.mat','*.json']
    tmpdir = mkdtemp()
    def tmpfile(suffix, dir=tmpdir):
        _, name = mkstemp(suffix=suffix[1:], dir=dir)
        return name

    fnames = []
    for ft in filetypes:
        x = tmpfile(ft)
        fnames.append(x)
        yield assert_true, os.path.exists(x)

    cleandir(tmpdir)
    for fp in fnames:
        yield assert_false, os.path.exists(fp)

def test_json():
    # Simple roundtrip test of json files, just a sanity check.
    adict = dict(a='one', c='three', b='two')
    fd, name = mkstemp(suffix='.json')
    save_json(name, adict) # save_json closes the file
    new_dict = load_json(name)
    os.unlink(name)
    yield assert_equal, sorted(adict.items()), sorted(new_dict.items())

def test_loadflat():
    alist = [dict(a='one', c='three', b='two'),
             dict(a='one', c='three', b='two')]
    fd, name = mkstemp(suffix='.npz')
    np.savez(name,a=alist)
    aloaded = loadflat(name)['a']
    os.unlink(name)
    yield assert_equal, len(aloaded), 2
    yield assert_equal, sorted(aloaded[0].items()), sorted(alist[0].items())
    adict = dict(a='one', c='three', b='two')
    fd, name = mkstemp(suffix='.npz')
    np.savez(name,a=adict)
    aloaded = loadflat(name)['a']
    os.unlink(name)
    yield assert_true, isinstance(aloaded, dict)
    yield assert_equal, sorted(aloaded.items()), sorted(adict.items())
    
