import os, sys
sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
from minhash_dedup import *

def test_shingles_basic():
    sh = shingles("abcde", 3)
    assert " abc" in sh or "abc" in sh or len(sh) > 0
    assert len(shingles("hello world", 4)) > 0

def test_identical_lines_high_similarity():
    a = "the quick brown fox jumps over the lazy dog"
    b = "the quick brown fox jumps over the lazy dog"
    sa = minhash_signature(shingles(a))
    sb = minhash_signature(shingles(b))
    assert jaccard_est(sa, sb) == 1.0

def test_distinct_lines_low_similarity():
    a = "the quick brown fox jumps over the lazy dog"
    b = "completely unrelated sentence about databases and servers"
    sa = minhash_signature(shingles(a))
    sb = minhash_signature(shingles(b))
    assert jaccard_est(sa, sb) < 0.5

def test_find_duplicates_detects_near_dup():
    lines = [
        "error: connection refused to host 10.0.0.1 port 5432",
        "error: connection refused to host 10.0.0.2 port 5432",
        "totally different line",
    ]
    dups = find_duplicates(lines, threshold=0.3)
    assert any((i,j)==(0,1) for i,j,_ in dups), dups

def test_candidate_pairs_self():
    sigs = [minhash_signature(shingles("abc"*10)), minhash_signature(shingles("abc"*10))]
    pairs = candidate_pairs(sigs, bands=8)
    assert (0,1) in pairs

def test_empty_shingle_set():
    sig = minhash_signature(set())
    assert all(x == 2**64-1 for x in sig)

def test_jaccard_length_mismatch():
    try:
        jaccard_est([1,2],[1,2,3])
        raise AssertionError("expected ValueError")
    except ValueError:
        pass

def test_threshold_filter():
    lines = ["aaaa", "bbbb", "cccc"]
    dups = find_duplicates(lines, threshold=0.99)
    # distinct short strings may or may not collide; just ensure no crash and type
    assert isinstance(dups, list)

if __name__ == "__main__":
    # minimal runner without pytest
    import traceback
    tests = [v for k,v in globals().items() if k.startswith("test_")]
    fails = 0
    for t in tests:
        try:
            t()
            print("PASS", t.__name__)
        except Exception as e:
            fails += 1
            print("FAIL", t.__name__, repr(e))
            traceback.print_exc()
    print("FAILS:", fails)
    sys.exit(1 if fails else 0)