"""Tests for bin/inject-hashed-filenames.py rewrite() (#3).

Pinned behaviour: the rewrite is tag-aware — only `<script src="…">` and
`<link href="…">` attribute values are replaced. Inert occurrences of the
old src in HTML comments, JSON literals, or unrelated attributes must be
left alone (the previous `html.replace` was substring-blind).
"""
import importlib.util
import os
import sys

HERE = os.path.dirname(os.path.abspath(__file__))
SCRIPT = os.path.join(os.path.dirname(HERE), "bin", "inject-hashed-filenames.py")

spec = importlib.util.spec_from_file_location("ihf", SCRIPT)
ihf = importlib.util.module_from_spec(spec)
sys.modules["ihf"] = ihf
spec.loader.exec_module(ihf)


def test_rewrites_script_src_double_quoted():
    html = '<script src="/static/dist/app.js"></script>'
    out, n = ihf.rewrite(html, "/static/dist/app.js", "/static/dist/app.abc123.js")
    assert n == 1
    assert out == '<script src="/static/dist/app.abc123.js"></script>'


def test_rewrites_script_src_single_quoted():
    html = "<script src='/static/dist/app.js'></script>"
    out, n = ihf.rewrite(html, "/static/dist/app.js", "/static/dist/app.abc123.js")
    assert n == 1
    assert "/static/dist/app.abc123.js" in out


def test_rewrites_link_href():
    html = '<link rel="stylesheet" href="/static/dist/app.css">'
    out, n = ihf.rewrite(html, "/static/dist/app.css", "/static/dist/app.abc123.css")
    assert n == 1
    assert '/static/dist/app.abc123.css' in out


def test_does_not_rewrite_inside_html_comment():
    html = '<!-- old script was at /static/dist/app.js --><script src="/other.js"></script>'
    out, n = ihf.rewrite(html, "/static/dist/app.js", "/static/dist/app.abc123.js")
    assert n == 0
    assert "/static/dist/app.js" in out
    assert "/static/dist/app.abc123.js" not in out


def test_does_not_rewrite_inside_json_literal():
    html = '<pre>{ "src": "/static/dist/app.js" }</pre>'
    out, n = ihf.rewrite(html, "/static/dist/app.js", "/static/dist/app.abc123.js")
    assert n == 0
    assert out == html


def test_does_not_rewrite_unrelated_attribute():
    html = '<img data-bundle="/static/dist/app.js">'
    out, n = ihf.rewrite(html, "/static/dist/app.js", "/static/dist/app.abc123.js")
    assert n == 0
    assert out == html


def test_does_not_rewrite_anchor_href():
    # Even though <a href="…"> is a `href` attribute, it isn't a <link>.
    html = '<a href="/static/dist/app.js">debug link</a>'
    out, n = ihf.rewrite(html, "/static/dist/app.js", "/static/dist/app.abc123.js")
    assert n == 0
    assert out == html


def test_rewrites_with_extra_attributes_around_src():
    html = '<script type="module" src="/static/dist/app.js" defer></script>'
    out, n = ihf.rewrite(html, "/static/dist/app.js", "/static/dist/app.abc123.js")
    assert n == 1
    assert '/static/dist/app.abc123.js' in out
    assert 'type="module"' in out and 'defer' in out