"""Tests for the focused failure summary shown in the error window."""

from devedeng.error import error_window


class FakeProc:
    def __init__(self, text="", command_var=None, stderr_data="", stdout_data=""):
        self.text = text
        self.command_var = command_var or []
        self.stderr_data = stderr_data
        self.stdout_data = stdout_data


def test_stderr_tail_takes_last_lines():
    raw = "\n".join("line %d" % i for i in range(100))
    tail = error_window._stderr_tail(FakeProc(stderr_data=raw), max_lines=5)
    assert tail.splitlines() == ["line 95", "line 96", "line 97",
                                 "line 98", "line 99"]


def test_stderr_tail_handles_carriage_returns():
    raw = "p 1\rp 2\rp 3\ndone\n"
    tail = error_window._stderr_tail(FakeProc(stderr_data=raw))
    assert tail.splitlines()[-2:] == ["p 3", "done"]


def test_stderr_tail_skips_blank_lines():
    raw = "real\n\n   \n\nlast\n"
    assert error_window._stderr_tail(FakeProc(stderr_data=raw)) == "real\nlast"


def test_stderr_tail_falls_back_to_stdout():
    p = FakeProc(stderr_data="", stdout_data="only on stdout\n")
    assert error_window._stderr_tail(p) == "only on stdout"


def test_stderr_tail_truncates_long_lines():
    raw = "x" * 500
    tail = error_window._stderr_tail(FakeProc(stderr_data=raw), max_line_len=200)
    assert tail.endswith(" ...")
    assert len(tail) <= 210


def test_build_summary_includes_step_command_and_tail():
    p = FakeProc(
        text="Converting My Movie",
        command_var=["nice", "-n", "10", "ffmpeg", "-i", "in.mkv", "out.mpg"],
        stderr_data="some warning\nfatal: invalid data found\n",
    )
    s = error_window.build_summary(p)
    assert "Converting My Movie" in s
    assert "ffmpeg" in s
    assert "invalid data found" in s
    # headline is present and markup is well-formed (bold tag closed)
    assert "<b>" in s and "</b>" in s


def test_build_summary_escapes_markup_special_chars():
    # a path with & and < must be escaped so set_markup doesn't choke
    p = FakeProc(text="Converting A & B <x>",
                 command_var=["ffmpeg", "-i", "a&b<x>.mkv"],
                 stderr_data="error: <bad> & worse\n")
    s = error_window.build_summary(p)
    assert "&amp;" in s
    assert "&lt;" in s
    # the raw unescaped sequences should not appear in dynamic content
    assert "a&b<x>.mkv" not in s


def test_build_summary_without_stderr_still_works():
    p = FakeProc(text="Creating ISO image", command_var=["mkisofs", "-o", "x"])
    s = error_window.build_summary(p)
    assert "Creating ISO image" in s
    assert "mkisofs" in s