from __future__ import with_statement
import random, time, threading

import pytest

from whoosh import analysis, fields, query, writing
from whoosh.compat import b, u, xrange, text_type
from whoosh.filedb.filestore import RamStorage
from whoosh.util.testing import TempIndex


def test_no_stored():
    schema = fields.Schema(id=fields.ID, text=fields.TEXT)
    with TempIndex(schema, "nostored") as ix:
        domain = (u("alfa"), u("bravo"), u("charlie"), u("delta"), u("echo"),
                  u("foxtrot"), u("golf"), u("hotel"), u("india"))

        w = ix.writer()
        for i in xrange(20):
            w.add_document(id=text_type(i),
                           text=u(" ").join(random.sample(domain, 5)))
        w.commit()

        with ix.reader() as r:
            assert sorted([int(id) for id in r.lexicon("id")]) == list(range(20))


def test_asyncwriter():
    schema = fields.Schema(id=fields.ID(stored=True), text=fields.TEXT)
    with TempIndex(schema, "asyncwriter") as ix:
        domain = (u("alfa"), u("bravo"), u("charlie"), u("delta"), u("echo"),
                  u("foxtrot"), u("golf"), u("hotel"), u("india"))

        writers = []
        # Simulate doing 20 (near-)simultaneous commits. If we weren't using
        # AsyncWriter, at least some of these would fail because the first
        # writer wouldn't be finished yet.
        for i in xrange(20):
            w = writing.AsyncWriter(ix)
            writers.append(w)
            w.add_document(id=text_type(i),
                           text=u(" ").join(random.sample(domain, 5)))
            w.commit()

        # Wait for all writers to finish before checking the results
        for w in writers:
            if w.running:
                w.join()

        # Check whether all documents made it into the index.
        with ix.reader() as r:
            assert sorted([int(id) for id in r.lexicon("id")]) == list(range(20))


def test_asyncwriter_no_stored():
    schema = fields.Schema(id=fields.ID, text=fields.TEXT)
    with TempIndex(schema, "asyncnostored") as ix:
        domain = (u("alfa"), u("bravo"), u("charlie"), u("delta"), u("echo"),
                  u("foxtrot"), u("golf"), u("hotel"), u("india"))

        writers = []
        # Simulate doing 20 (near-)simultaneous commits. If we weren't using
        # AsyncWriter, at least some of these would fail because the first
        # writer wouldn't be finished yet.
        for i in xrange(20):
            w = writing.AsyncWriter(ix)
            writers.append(w)
            w.add_document(id=text_type(i),
                           text=u(" ").join(random.sample(domain, 5)))
            w.commit()

        # Wait for all writers to finish before checking the results
        for w in writers:
            if w.running:
                w.join()

        # Check whether all documents made it into the index.
        with ix.reader() as r:
            assert sorted([int(id) for id in r.lexicon("id")]) == list(range(20))


def test_updates():
    schema = fields.Schema(id=fields.ID(unique=True, stored=True))
    ix = RamStorage().create_index(schema)
    for _ in xrange(10):
        with ix.writer() as w:
            w.update_document(id=u("a"))
    assert ix.doc_count() == 1


def test_buffered():
    schema = fields.Schema(id=fields.ID, text=fields.TEXT)
    with TempIndex(schema, "buffered") as ix:
        domain = u("alfa bravo charlie delta echo foxtrot golf hotel india")
        domain = domain.split()

        w = writing.BufferedWriter(ix, period=None, limit=10,
                                   commitargs={"merge": False})
        for i in xrange(20):
            w.add_document(id=text_type(i),
                           text=u(" ").join(random.sample(domain, 5)))
        time.sleep(0.1)
        w.close()

        assert len(ix._segments()) == 2


def test_buffered_search():
    schema = fields.Schema(id=fields.STORED, text=fields.TEXT)
    with TempIndex(schema, "bufferedsearch") as ix:
        w = writing.BufferedWriter(ix, period=None, limit=5)
        w.add_document(id=1, text=u("alfa bravo charlie"))
        w.add_document(id=2, text=u("bravo tango delta"))
        w.add_document(id=3, text=u("tango delta echo"))
        w.add_document(id=4, text=u("charlie delta echo"))

        with w.searcher() as s:
            r = s.search(query.Term("text", u("tango")))
            assert sorted([d["id"] for d in r]) == [2, 3]

        w.add_document(id=5, text=u("foxtrot golf hotel"))
        w.add_document(id=6, text=u("india tango juliet"))
        w.add_document(id=7, text=u("tango kilo lima"))
        w.add_document(id=8, text=u("mike november echo"))

        with w.searcher() as s:
            r = s.search(query.Term("text", u("tango")))
            assert sorted([d["id"] for d in r]) == [2, 3, 6, 7]

        w.close()


def test_buffered_update():
    schema = fields.Schema(id=fields.ID(stored=True, unique=True),
                           payload=fields.STORED)
    with TempIndex(schema, "bufferedupdate") as ix:
        w = writing.BufferedWriter(ix, period=None, limit=5)
        for i in xrange(10):
            for char in u("abc"):
                fs = dict(id=char, payload=text_type(i) + char)
                w.update_document(**fs)

        with w.reader() as r:
            sfs = [sf for _, sf in r.iter_docs()]
            sfs = sorted(sfs, key=lambda x: x["id"])
            assert sfs == [{'id': u('a'), 'payload': u('9a')},
                           {'id': u('b'), 'payload': u('9b')},
                           {'id': u('c'), 'payload': u('9c')}]
            assert r.doc_count() == 3

        w.close()


def test_buffered_threads():
    domain = u("alfa bravo charlie delta").split()
    schema = fields.Schema(name=fields.ID(unique=True, stored=True))
    with TempIndex(schema, "buffthreads") as ix:
        class SimWriter(threading.Thread):
            def run(self):
                for _ in xrange(5):
                    w.update_document(name=random.choice(domain))
                    time.sleep(random.uniform(0.01, 0.1))

        w = writing.BufferedWriter(ix, limit=10)
        threads = [SimWriter() for _ in xrange(5)]
        for thread in threads:
            thread.start()
        for thread in threads:
            thread.join()
        w.close()

        with ix.reader() as r:
            assert r.doc_count() == 4
            assert sorted([d["name"] for d in r.all_stored_fields()]) == domain


def test_fractional_weights():
    ana = analysis.RegexTokenizer(r"\S+") | analysis.DelimitedAttributeFilter()

    # With Positions format
    schema = fields.Schema(f=fields.TEXT(analyzer=ana))
    ix = RamStorage().create_index(schema)
    w = ix.writer()
    w.add_document(f=u("alfa^0.5 bravo^1.5 charlie^2.0 delta^1.5"))
    w.commit()

    with ix.searcher() as s:
        wts = []
        for word in s.lexicon("f"):
            p = s.postings("f", word)
            wts.append(p.weight())
        assert wts == [0.5, 1.5, 2.0, 1.5]

    # Try again with Frequency format
    schema = fields.Schema(f=fields.TEXT(analyzer=ana, phrase=False))
    ix = RamStorage().create_index(schema)
    w = ix.writer()
    w.add_document(f=u("alfa^0.5 bravo^1.5 charlie^2.0 delta^1.5"))
    w.commit()

    with ix.searcher() as s:
        wts = []
        for word in s.lexicon("f"):
            p = s.postings("f", word)
            wts.append(p.weight())
        assert wts == [0.5, 1.5, 2.0, 1.5]


def test_cancel_delete():
    schema = fields.Schema(id=fields.ID(stored=True))
    # Single segment
    with TempIndex(schema, "canceldelete1") as ix:
        w = ix.writer()
        for char in u("ABCD"):
            w.add_document(id=char)
        w.commit()

        with ix.reader() as r:
            assert not r.has_deletions()

        w = ix.writer()
        w.delete_document(2)
        w.delete_document(3)
        w.cancel()

        with ix.reader() as r:
            assert not r.has_deletions()
            assert not r.is_deleted(2)
            assert not r.is_deleted(3)

    # Multiple segments
    with TempIndex(schema, "canceldelete2") as ix:
        for char in u("ABCD"):
            w = ix.writer()
            w.add_document(id=char)
            w.commit(merge=False)

        with ix.reader() as r:
            assert not r.has_deletions()

        w = ix.writer()
        w.delete_document(2)
        w.delete_document(3)
        w.cancel()

        with ix.reader() as r:
            assert not r.has_deletions()
            assert not r.is_deleted(2)
            assert not r.is_deleted(3)


def test_delete_nonexistant():
    from whoosh.writing import IndexingError

    schema = fields.Schema(id=fields.ID(stored=True))
    # Single segment
    with TempIndex(schema, "deletenon1") as ix:
        w = ix.writer()
        for char in u("ABC"):
            w.add_document(id=char)
        w.commit()

        try:
            w = ix.writer()
            with pytest.raises(IndexingError):
                w.delete_document(5)
        finally:
            w.cancel()

    # Multiple segments
    with TempIndex(schema, "deletenon1") as ix:
        for char in u("ABC"):
            w = ix.writer()
            w.add_document(id=char)
            w.commit(merge=False)

        try:
            w = ix.writer()
            with pytest.raises(IndexingError):
                w.delete_document(5)
        finally:
            w.cancel()


def test_add_field():
    schema = fields.Schema(a=fields.TEXT)
    with TempIndex(schema, "addfield") as ix:
        with ix.writer() as w:
            w.add_document(a=u("alfa bravo charlie"))
        with ix.writer() as w:
            w.add_field("b", fields.ID(stored=True))
            w.add_field("c*", fields.ID(stored=True), glob=True)
            w.add_document(a=u("delta echo foxtrot"), b=u("india"), cat=u("juliet"))

        with ix.searcher() as s:
            fs = s.document(b=u("india"))
            assert fs == {"b": "india", "cat": "juliet"}


def test_add_reader():
    schema = fields.Schema(i=fields.ID(stored=True, unique=True),
                           a=fields.TEXT(stored=True, spelling=True),
                           b=fields.TEXT(vector=True))
    with TempIndex(schema, "addreader") as ix:
        with ix.writer() as w:
            w.add_document(i=u("0"), a=u("alfa bravo charlie delta"),
                           b=u("able baker coxwell dog"))
            w.add_document(i=u("1"), a=u("bravo charlie delta echo"),
                           b=u("elf fabio gong hiker"))
            w.add_document(i=u("2"), a=u("charlie delta echo foxtrot"),
                           b=u("india joker king loopy"))
            w.add_document(i=u("3"), a=u("delta echo foxtrot golf"),
                           b=u("mister noogie oompah pancake"))

        with ix.writer() as w:
            w.delete_by_term("i", "1")
            w.delete_by_term("i", "3")

        with ix.writer() as w:
            w.add_document(i=u("4"), a=u("hotel india juliet kilo"),
                           b=u("quick rhubarb soggy trap"))
            w.add_document(i=u("5"), a=u("india juliet kilo lima"),
                           b=u("umber violet weird xray"))

        with ix.reader() as r:
            assert r.doc_count_all() == 4

            sfs = list(r.all_stored_fields())
            assert sfs == [{"i": u("4"),
                            "a": u("hotel india juliet kilo")},
                           {"i": u("5"), "a":
                            u("india juliet kilo lima")},
                           {"i": u("0"), "a":
                            u("alfa bravo charlie delta")},
                           {"i": u("2"), "a":
                            u("charlie delta echo foxtrot")},
                           ]

            assert " ".join(r.field_terms("a")) == "alfa bravo charlie delta echo foxtrot hotel india juliet kilo lima"

            vs = []
            for docnum in r.all_doc_ids():
                v = r.vector(docnum, "b")
                vs.append(list(v.all_ids()))
            assert vs == [["quick", "rhubarb", "soggy", "trap"],
                          ["umber", "violet", "weird", "xray"],
                          ["able", "baker", "coxwell", "dog"],
                          ["india", "joker", "king", "loopy"]
                          ]

            gr = r.word_graph("a")
            assert list(gr.flatten_strings()) == ["alfa", "bravo", "charlie",
                                                  "delta", "echo", "foxtrot",
                                                  "hotel", "india", "juliet",
                                                  "kilo", "lima"]


def test_add_reader_spelling():
    # Test whether add_spell_word() items get copied over in a merge

    # Because b is stemming and spelled, it will use add_spell_word()
    ana = analysis.StemmingAnalyzer()
    schema = fields.Schema(a=fields.TEXT(spelling=True),
                           b=fields.TEXT(analyzer=ana, spelling=True))
    with TempIndex(schema, "addreadersp") as ix:
        with ix.writer() as w:
            w.add_document(a=u("rendering modeling compositing enabling"),
                           b=u("rendering modeling compositing enabling"))
            w.add_document(a=u("flying rolling tying quitting polling"),
                           b=u("flying rolling tying quitting polling"))

        with ix.writer() as w:
            w.add_document(a=u("writing eyeing ripping timing yelling"),
                           b=u("writing eyeing ripping timing yelling"))
            w.add_document(a=u("undoing indicating opening pressing"),
                           b=u("undoing indicating opening pressing"))

        with ix.searcher() as s:
            gr = s.reader().word_graph("a")
            assert " ".join(gr.flatten_strings()) == ("compositing enabling eyeing flying indicating "
                                                      "modeling opening polling pressing quitting "
                                                      "rendering ripping rolling timing tying undoing "
                                                      "writing yelling")

            gr = s.reader().word_graph("b")
            assert " ".join(gr.flatten_strings()) == ("compositing enabling eyeing flying indicating "
                                                      "modeling opening polling pressing quitting "
                                                      "rendering ripping rolling timing tying undoing "
                                                      "writing yelling")

def test_clear():
    schema = fields.Schema(a=fields.KEYWORD)
    ix = RamStorage().create_index(schema)

    # Add some segments
    with ix.writer() as w:
        w.add_document(a=u("one two three"))
        w.merge = False
    with ix.writer() as w:
        w.add_document(a=u("two three four"))
        w.merge = False
    with ix.writer() as w:
        w.add_document(a=u("three four five"))
        w.merge = False

    # Clear
    with ix.writer() as w:
        w.add_document(a=u("foo bar baz"))
        w.mergetype = writing.CLEAR

    with ix.searcher() as s:
        assert s.doc_count_all() == 1
        assert list(s.reader().lexicon("a")) == [b("bar"), b("baz"), b("foo")]

