"""Tests for tagsync.platform_windows: sidecar writer + support matrix.

Runs on any OS — the Windows-specific online-only stat test is skipped
except on Windows.
"""
from __future__ import annotations

import json
from pathlib import Path

import pytest

from tagsync.platform_windows import (
    XMP_WRITABLE_EXTS,
    WindowsWriter,
)


# --- supports() --------------------------------------------------------------


def test_supports_xmp_formats():
    w = WindowsWriter(exiftool="exiftool", write_sidecars=False)
    for ext in (".jpg", ".pdf", ".docx", ".mp4"):
        assert w.supports(Path(f"foo{ext}")), f"expected support for {ext}"


def test_supports_rejects_unknown_without_sidecars():
    w = WindowsWriter(exiftool="exiftool", write_sidecars=False)
    assert not w.supports(Path("archive.zip"))
    assert not w.supports(Path("notes.txt"))


def test_supports_accepts_unknown_with_sidecars():
    w = WindowsWriter(exiftool="exiftool", write_sidecars=True)
    assert w.supports(Path("archive.zip"))
    assert w.supports(Path("notes.txt"))


def test_supports_is_case_insensitive():
    w = WindowsWriter(exiftool="exiftool", write_sidecars=False)
    assert w.supports(Path("IMAGE.JPG"))
    assert w.supports(Path("report.PDF"))


# --- sidecar writer ---------------------------------------------------------


def test_sidecar_written_for_unsupported_type(tmp_path):
    w = WindowsWriter(exiftool="exiftool", write_sidecars=True)
    target = tmp_path / "archive.zip"
    target.touch()

    w.write_tags(target, ["project-alpha", "urgent"])

    sidecar = tmp_path / "archive.zip.tags.json"
    assert sidecar.exists()
    data = json.loads(sidecar.read_text())
    assert data == {"tags": ["project-alpha", "urgent"]}


def test_sidecar_cleared_when_tags_empty(tmp_path):
    w = WindowsWriter(exiftool="exiftool", write_sidecars=True)
    target = tmp_path / "archive.zip"
    target.touch()
    (tmp_path / "archive.zip.tags.json").write_text('{"tags": ["x"]}')

    w.write_tags(target, [])
    assert not (tmp_path / "archive.zip.tags.json").exists()


def test_sidecar_clear_nonexistent_is_ok(tmp_path):
    w = WindowsWriter(exiftool="exiftool", write_sidecars=True)
    target = tmp_path / "archive.zip"
    target.touch()
    # Should not raise even though no sidecar exists.
    w.write_tags(target, [])


def test_unsupported_without_sidecars_raises(tmp_path):
    w = WindowsWriter(exiftool="exiftool", write_sidecars=False)
    target = tmp_path / "archive.zip"
    target.touch()
    with pytest.raises(RuntimeError):
        w.write_tags(target, ["tag"])


# --- exiftool invocation ----------------------------------------------------
#
# We don't actually run exiftool; monkeypatch subprocess.run to capture args.


def test_exiftool_args_are_well_formed(tmp_path, monkeypatch):
    captured = {}

    def fake_run(args, **kwargs):
        captured["args"] = args
        class R:
            returncode = 0
            stderr = ""
        return R()

    import tagsync.platform_windows as pw
    monkeypatch.setattr(pw.subprocess, "run", fake_run)

    w = WindowsWriter(exiftool="exiftool", write_sidecars=False)
    target = tmp_path / "pic.jpg"
    target.touch()
    w.write_tags(target, ["alpha", "beta"])

    args = captured["args"]
    assert args[0] == "exiftool"
    assert "-overwrite_original" in args
    # Subject should be cleared then appended for each tag.
    assert "-XMP-dc:Subject=" in args
    assert "-XMP-dc:Subject+=alpha" in args
    assert "-XMP-dc:Subject+=beta" in args
    assert str(target) in args


def test_exiftool_failure_raises(tmp_path, monkeypatch):
    def fake_run(args, **kwargs):
        class R:
            returncode = 1
            stderr = "bad things happened"
        return R()

    import tagsync.platform_windows as pw
    monkeypatch.setattr(pw.subprocess, "run", fake_run)

    w = WindowsWriter(exiftool="exiftool", write_sidecars=False)
    target = tmp_path / "pic.jpg"
    target.touch()
    with pytest.raises(RuntimeError, match="bad things happened"):
        w.write_tags(target, ["x"])


# --- online-only detection --------------------------------------------------


@pytest.mark.windows
def test_is_online_only_returns_false_for_normal_files(tmp_path):
    w = WindowsWriter(exiftool="exiftool")
    f = tmp_path / "regular.txt"
    f.touch()
    assert w.is_online_only(f) is False


def test_is_online_only_returns_false_when_attribute_unavailable(tmp_path):
    """On non-Windows, st_file_attributes doesn't exist -> should return False."""
    w = WindowsWriter(exiftool="exiftool")
    f = tmp_path / "regular.txt"
    f.touch()
    assert w.is_online_only(f) is False