"""Unit tests for ``src.json_utils.parse_json``.

IMP-28 L4 — `_parse_json` dedup unit u2.

Pins the shared helper semantics that previously lived in
content_editor.py / design_director.py / kei_client.py (fuller form) and
pipeline.py (simple form). The fuller form is a strict superset of the
simple form; these tests cover both axes.
"""
from __future__ import annotations

from src.json_utils import parse_json


def test_parse_json_fenced_json_block():
    text = 'prefix\n```json\n{"a": 1, "b": "x"}\n```\nsuffix'
    assert parse_json(text) == {"a": 1, "b": "x"}


def test_parse_json_plain_fenced_block():
    text = 'prefix\n```\n{"x": 2}\n```\nsuffix'
    assert parse_json(text) == {"x": 2}


def test_parse_json_bare_braces():
    text = 'noise before {"y": 3, "z": [1, 2]} noise after'
    assert parse_json(text) == {"y": 3, "z": [1, 2]}


def test_parse_json_list_prefix_dash_cleanup():
    text = '- {"b": 4}'
    assert parse_json(text) == {"b": 4}


def test_parse_json_list_prefix_star_cleanup():
    text = '* {"c": 5}'
    assert parse_json(text) == {"c": 5}


def test_parse_json_no_json_returns_none():
    assert parse_json("no json here at all") is None


def test_parse_json_malformed_returns_none():
    assert parse_json("{ invalid json") is None


def test_parse_json_prefix_free_no_op():
    text = '{"d": 6}'
    assert parse_json(text) == {"d": 6}


def test_parse_json_fenced_preferred_over_bare_braces():
    text = 'outer {"outer": true} ```json\n{"inner": 1}\n```'
    assert parse_json(text) == {"inner": 1}