import time

import numpy as np
import pandas as pd
import pandas.testing as tm
import pytest
import requests

from pandas_datareader._testing import skip_on_exception
from pandas_datareader._utils import RemoteDataError
from pandas_datareader.wb import (
    WorldBankReader,
    download,
    get_countries,
    get_indicators,
    search,
)

pytestmark = pytest.mark.stable


class TestWB(object):
    def test_wdi_search(self):

        # Test that a name column exists, and that some results were returned
        # ...without being too strict about what the actual contents of the
        # results actually are.  The fact that there are some, is good enough.

        result = search("gdp.*capita.*constant")
        assert result.name.str.contains("GDP").any()

        # check cache returns the results within 0.5 sec
        current_time = time.time()
        result = search("gdp.*capita.*constant")
        assert result.name.str.contains("GDP").any()
        assert time.time() - current_time < 0.5

        result2 = WorldBankReader().search("gdp.*capita.*constant")
        session = requests.Session()

        result3 = search("gdp.*capita.*constant", session=session)
        result4 = WorldBankReader(session=session).search("gdp.*capita.*constant")

        for result in [result2, result3, result4]:
            assert result.name.str.contains("GDP").any()

    def test_wdi_download(self):

        # Test a bad indicator with double (US), triple (USA),
        # standard (CA, MX), non standard (KSV),
        # duplicated (US, US, USA), and unknown (BLA) country codes

        # ...but NOT a crash inducing country code (World Bank strips pandas
        #    users of the luxury of laziness because they create their
        #    own exceptions, and don't clean up legacy country codes.
        # ...but NOT a retired indicator (user should want it to error).

        cntry_codes = ["CA", "MX", "USA", "US", "US", "KSV", "BLA"]
        inds = ["NY.GDP.PCAP.CD", "BAD.INDICATOR"]

        # These are the expected results, rounded (robust against
        # data revisions in the future).
        expected = {
            "NY.GDP.PCAP.CD": {
                ("Canada", "2004"): 32000.0,
                ("Canada", "2003"): 28000.0,
                ("Kosovo", "2004"): 2000.0,
                ("Kosovo", "2003"): 2000.0,
                ("Mexico", "2004"): 7000.0,
                ("Mexico", "2003"): 7000.0,
                ("United States", "2004"): 42000.0,
                ("United States", "2003"): 39000.0,
            }
        }
        expected = pd.DataFrame(expected)
        expected = expected.sort_index()

        result = download(
            country=cntry_codes, indicator=inds, start=2003, end=2004, errors="ignore"
        )
        result = result.sort_index()

        # Round, to ignore revisions to data.
        result = np.round(result, decimals=-3)

        expected.index.names = ["country", "year"]
        tm.assert_frame_equal(result, expected)

        # pass start and end as string
        result = download(
            country=cntry_codes,
            indicator=inds,
            start="2003",
            end="2004",
            errors="ignore",
        )
        result = result.sort_index()

        # Round, to ignore revisions to data.
        result = np.round(result, decimals=-3)
        tm.assert_frame_equal(result, expected)

    def test_wdi_download_str(self):

        # These are the expected results, rounded (robust against
        # data revisions in the future).
        expected = {
            "NY.GDP.PCAP.CD": {
                ("Japan", "2004"): 38000.0,
                ("Japan", "2003"): 35000.0,
                ("Japan", "2002"): 32000.0,
                ("Japan", "2001"): 34000.0,
                ("Japan", "2000"): 39000.0,
            }
        }
        expected = pd.DataFrame(expected)
        expected = expected.sort_index()

        cntry_codes = "JP"
        inds = "NY.GDP.PCAP.CD"
        result = download(
            country=cntry_codes, indicator=inds, start=2000, end=2004, errors="ignore"
        )
        result = result.sort_index()
        result = np.round(result, decimals=-3)

        expected.index.names = ["country", "year"]
        tm.assert_frame_equal(result, expected)

        result = WorldBankReader(
            inds, countries=cntry_codes, start=2000, end=2004, errors="ignore"
        ).read()
        result = result.sort_index()
        result = np.round(result, decimals=-3)
        tm.assert_frame_equal(result, expected)

    def test_wdi_download_error_handling(self):
        cntry_codes = ["USA", "XX"]
        inds = "NY.GDP.PCAP.CD"

        msg = "Invalid Country Code\\(s\\): XX"
        with pytest.raises(ValueError, match=msg):
            download(
                country=cntry_codes,
                indicator=inds,
                start=2003,
                end=2004,
                errors="raise",
            )

        with pytest.warns(Warning):
            result = download(
                country=cntry_codes, indicator=inds, start=2003, end=2004, errors="warn"
            )
            assert isinstance(result, pd.DataFrame)
            assert len(result), 2

        cntry_codes = ["USA"]
        inds = ["NY.GDP.PCAP.CD", "BAD_INDICATOR"]

        msg = "The provided parameter value is not valid\\. " "Indicator: BAD_INDICATOR"
        with pytest.raises(ValueError, match=msg):
            download(
                country=cntry_codes,
                indicator=inds,
                start=2003,
                end=2004,
                errors="raise",
            )

        with pytest.warns(Warning):
            result = download(
                country=cntry_codes, indicator=inds, start=2003, end=2004, errors="warn"
            )
            assert isinstance(result, pd.DataFrame)
            assert len(result) == 2

    def test_wdi_download_w_retired_indicator(self):

        cntry_codes = ["CA", "MX", "US"]
        # Despite showing up in the search feature, and being listed online,
        # the api calls to GDPPCKD don't work in their own query builder, nor
        # pandas module.  GDPPCKD used to be a common symbol.
        #
        # This test is written to ensure that error messages to pandas users
        # continue to make sense, rather than a user getting some missing
        # key error, cause their JSON message format changed.  If
        #
        # World bank ever finishes the deprecation of this symbol,
        # this test should still pass.

        inds = ["GDPPCKD"]

        with pytest.raises(ValueError):
            result = download(
                country=cntry_codes,
                indicator=inds,
                start=2003,
                end=2004,
                errors="ignore",
            )

            # If it ever gets here, it means WB unretired the indicator.
            # even if they dropped it completely, it would still
            # get caught above
            # or the WB API changed somehow in a really
            # unexpected way.
            if len(result) > 0:  # pragma: no cover
                pytest.skip("Invalid results")

    def test_wdi_download_w_crash_inducing_countrycode(self):

        cntry_codes = ["CA", "MX", "US", "XXX"]
        inds = ["NY.GDP.PCAP.CD"]

        with pytest.raises(ValueError):
            result = download(
                country=cntry_codes,
                indicator=inds,
                start=2003,
                end=2004,
                errors="ignore",
            )

            # If it ever gets here, it means the country code XXX
            # got used by WB
            # or the WB API changed somehow in a really
            # unexpected way.
            if len(result) > 0:  # pragma: no cover
                pytest.skip("Invalid results")

    def test_wdi_get_countries(self):
        result1 = get_countries()
        result2 = WorldBankReader().get_countries()

        session = requests.Session()
        result3 = get_countries(session=session)
        result4 = WorldBankReader(session=session).get_countries()

        for result in [result1, result2, result3, result4]:
            assert "Zimbabwe" in list(result["name"])
            assert len(result) > 100
            assert pd.notnull(result.latitude.mean())
            assert pd.notnull(result.longitude.mean())

    def test_wdi_get_indicators(self):
        result1 = get_indicators()
        result2 = WorldBankReader().get_indicators()

        session = requests.Session()
        result3 = get_indicators(session=session)
        result4 = WorldBankReader(session=session).get_indicators()

        for result in [result1, result2, result3, result4]:
            exp_col = pd.Index(
                [
                    "id",
                    "name",
                    "unit",
                    "source",
                    "sourceNote",
                    "sourceOrganization",
                    "topics",
                ]
            )
            # Column order is version dependent, so check columns are present
            assert sorted(result.columns) == sorted(exp_col)
            assert len(result) > 10000

    @skip_on_exception(RemoteDataError)
    def test_wdi_download_monthly(self):
        expected = {
            "COPPER": {
                ("World", "2012M01"): 8040.47,
                ("World", "2011M12"): 7565.48,
                ("World", "2011M11"): 7581.02,
                ("World", "2011M10"): 7394.19,
                ("World", "2011M09"): 8300.14,
                ("World", "2011M08"): 9000.76,
                ("World", "2011M07"): 9650.46,
                ("World", "2011M06"): 9066.85,
                ("World", "2011M05"): 8959.90,
                ("World", "2011M04"): 9492.79,
                ("World", "2011M03"): 9503.36,
                ("World", "2011M02"): 9867.60,
                ("World", "2011M01"): 9555.70,
            }
        }
        expected = pd.DataFrame(expected)
        # Round, to ignore revisions to data.
        expected = np.round(expected, decimals=-3)
        expected = expected.sort_index()
        cntry_codes = "ALL"
        inds = "COPPER"
        result = download(
            country=cntry_codes,
            indicator=inds,
            start=2011,
            end=2012,
            freq="M",
            errors="ignore",
        )
        result = result.sort_index()
        result = np.round(result, decimals=-3)

        expected.index.names = ["country", "year"]
        tm.assert_frame_equal(result, expected)

        result = WorldBankReader(
            inds, countries=cntry_codes, start=2011, end=2012, freq="M", errors="ignore"
        ).read()
        result = result.sort_index()
        result = np.round(result, decimals=-3)
        tm.assert_frame_equal(result, expected)

    def test_wdi_download_quarterly(self):
        code = "DT.DOD.PUBS.CD.US"
        expected = {
            code: {
                ("Albania", "2012Q1"): 3240539817.18,
                ("Albania", "2011Q4"): 3213979715.15,
                ("Albania", "2011Q3"): 3187681048.95,
                ("Albania", "2011Q2"): 3248041513.86,
                ("Albania", "2011Q1"): 3137210567.92,
            }
        }
        expected = pd.DataFrame(expected)
        # Round, to ignore revisions to data.
        expected = np.round(expected, decimals=-3)
        expected = expected.sort_index()
        cntry_codes = "ALB"
        inds = "DT.DOD.PUBS.CD.US"
        result = download(
            country=cntry_codes,
            indicator=inds,
            start=2011,
            end=2012,
            freq="Q",
            errors="ignore",
        )
        result = result.sort_index()
        result = np.round(result, decimals=-3)

        expected.index.names = ["country", "year"]
        tm.assert_frame_equal(result, expected)

        result = WorldBankReader(
            inds, countries=cntry_codes, start=2011, end=2012, freq="Q", errors="ignore"
        ).read()
        result = result.sort_index()
        result = np.round(result, decimals=-1)
        tm.assert_frame_equal(result, expected)
