"""Unit tests for canonical flow files (export.py). No DB or LFX needed."""

import json

import pytest

from app.flows import export


@pytest.mark.parametrize(
    ("name", "expected"),
    [
        ("simple_rule", "simple_rule"),
        ("test_flow", "test_flow"),
        ("Gehaltserhöhung", "Gehaltserhöhung"),
        ("Dachsanierung 200k", "Dachsanierung 200k"),
        ("  A/B\\C  ", "A-B-C"),
        ('a:b*c?d"e<f>g|h', "a-b-c-d-e-f-g-h"),
        ("trailing...", "trailing"),
        ("", "flow"),
    ],
)
def test_filename_stem_keeps_original_names(name, expected):
    assert export.filename_stem(name) == expected


def test_canonical_bytes_stable_under_key_reorder():
    doc = {"name": "x", "data": {"nodes": [], "edges": []}, "tags": ["b", "a"]}
    shuffled = {"tags": ["b", "a"], "data": {"edges": [], "nodes": []}, "name": "x"}
    assert export.canonical_bytes(shuffled) == export.canonical_bytes(doc)
    assert export.content_hash(doc) == export.content_hash(shuffled)


def test_write_and_read_roundtrip_is_byte_stable(tmp_path):
    doc = {"name": "My Flow", "data": {"nodes": [], "edges": []}}
    path = export.write_flow_file(tmp_path, doc)
    assert path == tmp_path / "My Flow.json"
    assert json.loads(path.read_text()) == doc
    # Rewriting identical content is byte-identical (no phantom git diffs).
    before = path.read_bytes()
    export.write_flow_file(tmp_path, doc)
    assert path.read_bytes() == before


def test_iter_flow_files_only_top_level_json(tmp_path):
    (tmp_path / "a.json").write_text("{}")
    (tmp_path / "b.txt").write_text("{}")
    sub = tmp_path / "sub"
    sub.mkdir()
    (sub / "c.json").write_text("{}")
    assert export.iter_flow_files(tmp_path) == [tmp_path / "a.json"]


def test_flowsignore_parsing_and_filtering(tmp_path):
    assert export.ignored_stems(tmp_path) == set()
    (tmp_path / export.IGNORE_FILENAME).write_text(
        "# experiments stay Langflow-only\n\ni_love_this_app\n", encoding="utf-8"
    )
    assert export.ignored_stems(tmp_path) == {"i_love_this_app"}
    (tmp_path / "a.json").write_text("{}")
    (tmp_path / "i_love_this_app.json").write_text("{}")
    assert export.iter_flow_files(tmp_path) == [tmp_path / "a.json"]
    # Explicit override still works.
    assert export.iter_flow_files(tmp_path, ignored=set()) == [
        tmp_path / "a.json",
        tmp_path / "i_love_this_app.json",
    ]


def test_find_reuse_path_ignores_ignored_files(tmp_path):
    (tmp_path / export.IGNORE_FILENAME).write_text("alt\n", encoding="utf-8")
    (tmp_path / "alt.json").write_text(json.dumps({"name": "Neu"}))
    assert export.find_reuse_path(tmp_path, {"name": "Neu"}) == (None, False)


def test_find_reuse_path_matches_identical_content_first(tmp_path):
    doc = {"name": "Simple Rule", "data": {"nodes": [], "edges": []}}
    other = tmp_path / "other-name.json"
    other.write_text(export.canonical_bytes(doc).decode())
    path, identical = export.find_reuse_path(tmp_path, dict(doc))
    assert (path, identical) == (other, True)


def test_find_reuse_path_matches_same_name(tmp_path):
    old = {"name": "Simple Rule", "data": {"nodes": [], "edges": []}, "extra": 1}
    (tmp_path / "simple_rule.json").write_text(json.dumps(old))
    new = {"name": "Simple Rule", "data": {"nodes": [], "edges": []}}
    path, identical = export.find_reuse_path(tmp_path, new)
    assert (path, identical) == (tmp_path / "simple_rule.json", False)


def test_find_reuse_path_no_match_and_missing_dir(tmp_path):
    (tmp_path / "a.json").write_text(json.dumps({"name": "Other"}))
    assert export.find_reuse_path(tmp_path, {"name": "Neu"}) == (None, False)
    assert export.find_reuse_path(tmp_path / "gibts-nicht", {"name": "Neu"}) == (None, False)


def test_find_reuse_path_skips_unreadable_files(tmp_path):
    (tmp_path / "kaputt.json").write_text("{kein json")
    assert export.find_reuse_path(tmp_path, {"name": "Neu"}) == (None, False)


def test_write_flow_file_is_world_readable(tmp_path):
    import os
    import stat

    doc = {"name": "Lesbar", "data": {"nodes": [], "edges": []}}
    path = export.write_flow_file(tmp_path, doc)
    mode = stat.S_IMODE(os.stat(path).st_mode)
    # Read bits for user/group/other (mkstemp defaults to 0o600; on Windows
    # chmod maps to 0o666, so only assert the read bits, not the exact mode).
    assert mode & 0o444 == 0o444, f"expected world-readable, got {oct(mode)}"