#!/usr/bin/env python3
"""Weryfikacja zmiany http:// -> https:// po fakcie (poprawne parowanie hunkow).

Git w obrebie hunka wypisuje najpierw wszystkie linie '-', potem wszystkie '+',
wiec parujemy je per-hunk, a nie linia-po-linii.
"""
import subprocess
import sys

R = "/var/lib/pagan-sync/recipes"


def git(*a):
    return subprocess.run(["git", "-C", R] + list(a), capture_output=True, text=True).stdout


diff = git("diff", "-U0", "--no-color")
if not diff.strip():
    print("brak zmian w git diff")
    sys.exit(0)

minus, plus = [], []
pairs_ok = 0
bad = []
len_mismatch = []


def flush(fname):
    global minus, plus, pairs_ok
    if not minus and not plus:
        minus, plus = [], []
        return
    if len(minus) != len(plus):
        len_mismatch.append((fname, len(minus), len(plus), list(minus), list(plus)))
    else:
        for m, p in zip(minus, plus):
            expect = m.replace("http://", "https://", 1)
            if p == expect:
                pairs_ok += 1
            else:
                bad.append((fname, m, p))
    minus, plus = [], []


fname = "?"
for line in diff.splitlines():
    if line.startswith("diff --git"):
        flush(fname)
        fname = line.split(" b/")[-1]
        continue
    if line.startswith("@@"):
        flush(fname)
        continue
    if line.startswith(("--- ", "+++ ", "index ", "new file", "deleted", "old mode", "new mode",
                        "similarity", "rename", "Binary")):
        continue
    if line.startswith("-"):
        minus.append(line[1:])
    elif line.startswith("+"):
        plus.append(line[1:])
flush(fname)

print(f"par -/+ zgodnych z zamiana schematu: {pairs_ok}")
print(f"par niezgodnych (tresc sie zmienila inaczej): {len(bad)}")
for f, m, p in bad[:20]:
    print(f"   [{f}]")
    print("     MINUS:", m[:120])
    print("     PLUS :", p[:120])
print(f"hunkow z rozna liczba -/+ (dodane/usuniete linie): {len(len_mismatch)}")
for f, a, b, ms, ps in len_mismatch[:10]:
    print(f"   [{f}] -={a} +={b}")
    for x in ms[:6]:
        print("      M:", x[:110])
    for x in ps[:6]:
        print("      P:", x[:110])