# Licensed under a 3-clause BSD style license - see LICENSE.rst
# -*- coding: utf-8 -*-

import datetime
from collections import OrderedDict

import pytest

import numpy as np

from astropy import time
from astropy import __minimum_asdf_version__

asdf = pytest.importorskip('asdf', minversion=__minimum_asdf_version__)
from asdf import AsdfFile, yamlutil, tagged
from asdf.tests import helpers
import asdf.schema as asdf_schema


def _flatten_combiners(schema):
    newschema = OrderedDict()

    def add_entry(path, schema, combiner):
        # TODO: Simplify?
        cursor = newschema
        for i in range(len(path)):
            part = path[i]
            if isinstance(part, int):
                cursor = cursor.setdefault('items', [])
                while len(cursor) <= part:
                    cursor.append({})
                cursor = cursor[part]
            elif part == 'items':
                cursor = cursor.setdefault('items', OrderedDict())
            else:
                cursor = cursor.setdefault('properties', OrderedDict())
                if i < len(path) - 1 and isinstance(path[i+1], int):
                    cursor = cursor.setdefault(part, [])
                else:
                    cursor = cursor.setdefault(part, OrderedDict())

        cursor.update(schema)


def test_time(tmpdir):
    time_array = time.Time(
        np.arange(100), format="unix")

    tree = {
        'large_time_array': time_array
    }

    helpers.assert_roundtrip_tree(tree, tmpdir)


def test_time_with_location(tmpdir):
    # See https://github.com/spacetelescope/asdf/issues/341
    from astropy import units as u
    from astropy.coordinates.earth import EarthLocation

    location = EarthLocation(x=[1,2]*u.m, y=[3,4]*u.m, z=[5,6]*u.m)

    t = time.Time([1,2], location=location, format='cxcsec')

    tree = {'time': t}

    helpers.assert_roundtrip_tree(tree, tmpdir)


def test_isot(tmpdir):
    tree = {
        'time': time.Time('2000-01-01T00:00:00.000')
    }

    helpers.assert_roundtrip_tree(tree, tmpdir)

    ff = asdf.AsdfFile(tree)
    tree = yamlutil.custom_tree_to_tagged_tree(ff.tree, ff)
    assert isinstance(tree['time'], str)


def test_isot_array(tmpdir):

    tree = {
        'time': time.Time(['2001-01-02T12:34:56', '2001-02-03T00:01:02'])
    }

    helpers.assert_roundtrip_tree(tree, tmpdir)


def test_time_tag():
    schema = asdf_schema.load_schema(
        'http://stsci.edu/schemas/asdf/time/time-1.1.0',
        resolve_references=True)
    schema = _flatten_combiners(schema)

    date = time.Time(datetime.datetime.now())
    tree = {'date': date}
    asdf = AsdfFile(tree=tree)
    instance = yamlutil.custom_tree_to_tagged_tree(tree['date'], asdf)

    asdf_schema.validate(instance, schema=schema)

    tag = 'tag:stsci.edu:asdf/time/time-1.1.0'
    date = tagged.tag_object(tag, date)
    tree = {'date': date}
    asdf = AsdfFile(tree=tree)
    instance = yamlutil.custom_tree_to_tagged_tree(tree['date'], asdf)

    asdf_schema.validate(instance, schema=schema)
