#!/usr/bin/env python3
"""Tests for the extractability classifier. Pure python, no deps."""
import sys
from pathlib import Path
sys.path.insert(0, str(Path(__file__).resolve().parents[1]))
from src.extractability import classify, normalise, is_subsequence, PAIRS

PASS = FAIL = 0
def chk(c, l, d=""):
    global PASS, FAIL
    if c: PASS += 1; print(f"  ok   {l}")
    else:  FAIL += 1; print(f"  FAIL {l}  {d}")

print("[exact]")
chk(classify("$9,438.", "the average cost was $9,438. in 1980") == "exact", "literal substring")
chk(classify("Average low of 73.3 degrees",
             "Caribbean: Average low of 73.3 degrees to a high of 82.9") == "exact", "longer span")
chk(classify("$9,438", "the cost was $ 9,438 that year") in ("subseq", "exact"),
    "punctuation-insensitive")

print("\n[subsequence]")
chk(classify("infections of the oil glands",
             "Styes are caused by infections of the eyelid oil glands") == "subseq",
    "tokens in order with insertion")

print("\n[overlap80]")
chk(classify("staphylococcus bacteria infections eyelid",
             "eyelid infections from bacteria such as staphylococcus") == "overlap80",
    "reordered tokens")

print("\n[none = abstractive]")
chk(classify("Yes, it improves sleep quality.",
             "Participants reported feeling more rested after the trial.") == "none",
    "paraphrase is not extractive")

print("\n[unicode / indic]")
chk(classify("७३.३ डिग्री", "औसत ७३.३ डिग्री तापमान") == "exact", "devanagari substring")
chk(normalise("  A  B C ") == "a b c", "NFKC + whitespace collapse")

print("\n[edge cases]")
chk(classify("", "anything") == "none", "empty answer")
chk(classify("x", "") == "none", "empty passage")
chk(is_subsequence(["a", "c"], ["a", "b", "c"]), "subsequence helper")
chk(not is_subsequence(["c", "a"], ["a", "b", "c"]), "order matters")

print("\n[pair selection]")
chk(set(PAIRS) == {"english", "translated"}, "both pairs registered")
chk(PAIRS["english"] == ("answer_en", "text_en"), "english pair maps to the English fields")
chk(PAIRS["translated"] == ("answer", "text"),
    "translated pair maps to what the reader actually reads")

# The whole point of --pair translated: a paraphrased translation destroys the
# verbatim span even when the English original had one.
chk(classify("73.3 degrees", "Average low of 73.3 degrees to a high of 82.9") == "exact",
    "English original is a clean span")
chk(classify("तापमान ७३.३ डिग्री तक गिर जाता है",
             "कैरिबियन में न्यूनतम औसत ७३.३ डिग्री और अधिकतम ८२.९ डिग्री रहता है") == "none",
    "same fact, reworded translation -> not extractive")

print(f"\n{'='*50}\n  {PASS} passed, {FAIL} failed\n{'='*50}")
sys.exit(1 if FAIL else 0)