#!/usr/bin/env python3
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# Copyright 2024 The Dawn & Tint Authors
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"""Asserts that all expectation file headers are in sync."""

import os

TAG_HEADER_START = '# BEGIN TAG HEADER'
TAG_HEADER_END = '# END TAG HEADER'

EXPECTATION_FILES = [
    os.path.realpath(
        os.path.join(os.path.dirname(__file__), '..', 'expectations.txt')),
    os.path.realpath(
        os.path.join(os.path.dirname(__file__), '..',
                     'compat-expectations.txt')),
]

tag_headers = {}
for ef in EXPECTATION_FILES:
    with open(ef, encoding='utf-8') as infile:
        content = infile.read()

    header_lines = []
    in_header = False
    for line in content.splitlines():
        line = line.strip()
        if line.startswith(TAG_HEADER_START):
            in_header = True
            continue
        if not in_header:
            continue
        if line.startswith(TAG_HEADER_END):
            break
        header_lines.append(line)
    tag_headers[ef] = '\n'.join(header_lines)

for left_ef, left_header in tag_headers.items():
    for right_ef, right_header in tag_headers.items():
        if left_ef == right_ef:
            continue
        if left_header != right_header:
            raise RuntimeError(
                f'The tag headers in {left_ef} and {right_ef} are out of sync')