"""Comprehensive coverage tests for json_utils and type_utils.

Tests every public and private function in:
- local_deep_research.utilities.json_utils
- local_deep_research.utilities.type_utils

Pure-function tests -- no complex mocks required.
"""

import json
from unittest.mock import MagicMock

import pytest

from local_deep_research.utilities.json_utils import (
    _clean_llm_json_artifacts,
    _extract_by_brackets,
    _remove_think_tags,
    _strip_code_fences,
    extract_json,
    get_llm_response_text,
)
from local_deep_research.utilities.type_utils import to_bool

MODULE_JSON = "local_deep_research.utilities.json_utils"
MODULE_TYPE = "local_deep_research.utilities.type_utils"


# ===================================================================
# get_llm_response_text
# ===================================================================


class TestGetLlmResponseText:
    """Cover .content, .text, str() fallback, think-tag removal, None."""

    def test_content_attribute_string(self):
        obj = MagicMock()
        obj.content = "hello from content"
        assert get_llm_response_text(obj) == "hello from content"

    def test_text_attribute_string(self):
        """Falls to .text when .content is absent."""
        obj = MagicMock(spec=[])  # spec=[] -> no .content
        obj.text = "hello from text"
        result = get_llm_response_text(obj)
        assert result == "hello from text"

    def test_plain_string_passthrough(self):
        assert get_llm_response_text("raw string") == "raw string"

    def test_think_tags_removed_from_content(self):
        obj = MagicMock()
        obj.content = "<think>internal reasoning</think>visible answer"
        assert get_llm_response_text(obj) == "visible answer"

    def test_none_returns_empty_string(self):
        assert get_llm_response_text(None) == ""

    def test_content_none_falls_to_text(self):
        """When .content is None, the .text branch is tried."""
        obj = MagicMock()
        obj.content = None
        obj.text = "fallback text"
        assert get_llm_response_text(obj) == "fallback text"

    def test_text_none_falls_to_str(self):
        """When both .content and .text are None, str(response) is used."""
        obj = MagicMock(spec=[])
        obj.text = None
        result = get_llm_response_text(obj)
        assert isinstance(result, str)

    def test_non_string_content_converted(self):
        """Non-string .content is converted via str()."""
        obj = MagicMock()
        obj.content = 12345
        assert get_llm_response_text(obj) == "12345"

    def test_integer_input_uses_str(self):
        assert get_llm_response_text(42) == "42"

    def test_multiple_think_blocks(self):
        obj = MagicMock()
        obj.content = "<think>a</think>X<think>b</think>Y"
        assert get_llm_response_text(obj) == "XY"


# ===================================================================
# extract_json
# ===================================================================


class TestExtractJson:
    """Cover valid JSON, code-fenced JSON, surrounding text, malformed
    JSON, expected_type filtering, empty/None inputs."""

    # --- valid JSON -------------------------------------------------

    def test_valid_dict(self):
        assert extract_json('{"a": 1}') == {"a": 1}

    def test_valid_list(self):
        assert extract_json("[1, 2, 3]") == [1, 2, 3]

    def test_valid_nested(self):
        text = '{"x": [1, {"y": 2}]}'
        assert extract_json(text) == {"x": [1, {"y": 2}]}

    # --- JSON inside code fences ------------------------------------

    def test_json_in_json_fence(self):
        text = '```json\n{"key": "val"}\n```'
        assert extract_json(text) == {"key": "val"}

    def test_json_in_plain_fence(self):
        text = '```\n{"key": "val"}\n```'
        assert extract_json(text) == {"key": "val"}

    # --- JSON with surrounding prose --------------------------------

    def test_prose_around_dict(self):
        text = 'Here is the result: {"score": 9} -- done.'
        assert extract_json(text) == {"score": 9}

    def test_prose_around_list(self):
        text = "The indices are: [0, 3, 5] as computed."
        assert extract_json(text, expected_type=list) == [0, 3, 5]

    # --- malformed JSON cleaned up ----------------------------------

    def test_trailing_comma_in_dict(self):
        text = '{"a": 1, "b": 2,}'
        assert extract_json(text) == {"a": 1, "b": 2}

    def test_trailing_comma_in_list(self):
        text = "[1, 2, 3,]"
        assert extract_json(text) == [1, 2, 3]

    def test_js_line_comments(self):
        text = '{\n"a": 1, // first\n"b": 2 // second\n}'
        assert extract_json(text) == {"a": 1, "b": 2}

    def test_ellipsis_entry_removed(self):
        text = "[1, 2, 3, ...]"
        assert extract_json(text, expected_type=list) == [1, 2, 3]

    # --- expected_type filtering ------------------------------------

    def test_expected_dict_returns_dict(self):
        assert extract_json('{"k": 1}', expected_type=dict) == {"k": 1}

    def test_expected_list_returns_list(self):
        assert extract_json("[1]", expected_type=list) == [1]

    def test_expected_list_but_got_dict_falls_to_bracket(self):
        """Direct parse gives dict; bracket extraction for [] finds inner list."""
        text = '{"items": [10, 20]}'
        result = extract_json(text, expected_type=list)
        assert result == [10, 20]

    def test_expected_dict_but_got_list_returns_none(self):
        """Plain list when dict expected and no inner dict exists."""
        assert extract_json("[1, 2]", expected_type=dict) is None

    # --- empty / None -----------------------------------------------

    def test_empty_string(self):
        assert extract_json("") is None

    def test_whitespace_only(self):
        assert extract_json("   \n\t  ") is None

    def test_none_input(self):
        assert extract_json(None) is None

    # --- scalar JSON values are not returned ------------------------

    def test_scalar_number(self):
        assert extract_json("42") is None

    def test_scalar_string(self):
        assert extract_json('"hello"') is None

    def test_scalar_bool(self):
        assert extract_json("true") is None

    def test_scalar_null(self):
        assert extract_json("null") is None

    # --- deepseek-style think+fence pattern -------------------------

    def test_think_then_fence(self):
        text = '<think>reasoning</think>\n```json\n{"answer": "yes"}\n```'
        assert extract_json(text) == {"answer": "yes"}

    # --- completely invalid text ------------------------------------

    def test_no_json_at_all(self):
        assert extract_json("Hello, this is plain text.") is None

    def test_brackets_with_garbage(self):
        assert extract_json("{not json at all!}") is None


# ===================================================================
# _remove_think_tags
# ===================================================================


class TestRemoveThinkTags:
    """Paired tags, orphaned tags, no tags, empty input."""

    def test_paired_tags_removed(self):
        assert _remove_think_tags("<think>x</think>y") == "y"

    def test_multiline_content_removed(self):
        text = "<think>\nline1\nline2\n</think>result"
        assert _remove_think_tags(text) == "result"

    def test_orphaned_closing_tag(self):
        assert _remove_think_tags("before</think>after") == "beforeafter"

    def test_orphaned_opening_tag(self):
        assert _remove_think_tags("before<think>after") == "beforeafter"

    def test_no_tags(self):
        assert _remove_think_tags("no tags here") == "no tags here"

    def test_empty_string(self):
        assert _remove_think_tags("") == ""

    def test_multiple_paired_blocks(self):
        text = "<think>a</think>X<think>b</think>Y"
        assert _remove_think_tags(text) == "XY"

    def test_only_think_tags_returns_empty(self):
        assert _remove_think_tags("<think>all gone</think>") == ""

    def test_result_is_stripped(self):
        assert _remove_think_tags("  <think>x</think>  y  ") == "y"


# ===================================================================
# _strip_code_fences
# ===================================================================


class TestStripCodeFences:
    """```json fences, plain ``` fences, no fences."""

    def test_json_fence(self):
        text = '```json\n{"a": 1}\n```'
        assert _strip_code_fences(text) == '{"a": 1}'

    def test_plain_fence(self):
        text = '```\n{"a": 1}\n```'
        assert _strip_code_fences(text) == '{"a": 1}'

    def test_no_fences(self):
        text = '{"a": 1}'
        assert _strip_code_fences(text) == '{"a": 1}'

    def test_json_fence_preferred_over_plain(self):
        """```json is checked before plain ```."""
        text = '```json\n{"first": 1}\n```\n```\n{"second": 2}\n```'
        result = _strip_code_fences(text)
        assert '{"first": 1}' in result

    def test_only_two_backtick_groups_returns_original(self):
        """Single ``` without a matching close returns original text."""
        text = "some ``` text"
        assert _strip_code_fences(text) == text

    def test_json_fence_no_closing(self):
        text = '```json\n{"key": "val"}'
        result = _strip_code_fences(text)
        assert '{"key": "val"}' in result

    def test_json_fence_with_whitespace(self):
        text = '```json\n  {"a": 1}  \n```'
        assert _strip_code_fences(text) == '{"a": 1}'


# ===================================================================
# _extract_by_brackets
# ===================================================================


class TestExtractByBrackets:
    """Dict brackets, list brackets, nested, no brackets."""

    def test_dict_brackets(self):
        assert _extract_by_brackets('x{"a":1}y', "{", "}") == '{"a":1}'

    def test_list_brackets(self):
        assert _extract_by_brackets("x[1,2]y", "[", "]") == "[1,2]"

    def test_nested_brackets(self):
        text = '{"a": {"b": 1}}'
        assert _extract_by_brackets(text, "{", "}") == text

    def test_no_opening_bracket(self):
        assert _extract_by_brackets("no brackets", "{", "}") is None

    def test_no_closing_bracket(self):
        assert _extract_by_brackets("{no close", "{", "}") is None

    def test_close_before_open(self):
        """Closing bracket appears before opening -- end <= start."""
        assert _extract_by_brackets("}text{", "{", "}") is None

    def test_empty_string(self):
        assert _extract_by_brackets("", "{", "}") is None

    def test_adjacent_brackets(self):
        assert _extract_by_brackets("prefix{}suffix", "{", "}") == "{}"

    def test_multiple_opens_uses_first(self):
        text = "{ extra { inner }}"
        result = _extract_by_brackets(text, "{", "}")
        assert result.startswith("{")

    def test_multiple_closes_uses_last(self):
        text = '{"a": {"b": 1}} }'
        result = _extract_by_brackets(text, "{", "}")
        assert result.endswith("}")


# ===================================================================
# _clean_llm_json_artifacts
# ===================================================================


class TestCleanLlmJsonArtifacts:
    """Trailing commas, JS comments, ellipsis entries."""

    def test_trailing_comma_before_close_brace(self):
        text = '{"a": 1,}'
        result = _clean_llm_json_artifacts(text)
        assert json.loads(result) == {"a": 1}

    def test_trailing_comma_before_close_bracket(self):
        text = "[1, 2,]"
        result = _clean_llm_json_artifacts(text)
        assert json.loads(result) == [1, 2]

    def test_trailing_comma_with_whitespace(self):
        text = '{"a": 1 ,  \n  }'
        result = _clean_llm_json_artifacts(text)
        assert json.loads(result) == {"a": 1}

    def test_inline_comment_removed(self):
        text = '{"a": 1 // comment\n}'
        result = _clean_llm_json_artifacts(text)
        assert "//" not in result
        assert json.loads(result) == {"a": 1}

    def test_multiple_comments(self):
        text = '{\n"a": 1, // first\n"b": 2 // second\n}'
        result = _clean_llm_json_artifacts(text)
        assert json.loads(result) == {"a": 1, "b": 2}

    def test_trailing_ellipsis_removed(self):
        text = "[1, 2, ...]"
        result = _clean_llm_json_artifacts(text)
        assert "..." not in result

    def test_quoted_ellipsis_between_items(self):
        text = '[1, "...", 2]'
        result = _clean_llm_json_artifacts(text)
        assert "..." not in result

    def test_ellipsis_between_items_keeps_one_comma(self):
        """The comma-preserving regex handles , ... , correctly."""
        text = "[1, ..., 2]"
        result = _clean_llm_json_artifacts(text)
        assert "..." not in result

    def test_single_slash_not_touched(self):
        """A single / is not a comment."""
        text = '{"path": "/api/v1"}'
        assert _clean_llm_json_artifacts(text) == text

    def test_clean_json_unchanged(self):
        text = '{"a": 1, "b": [2, 3]}'
        assert _clean_llm_json_artifacts(text) == text

    def test_all_artifacts_combined(self):
        text = "[\n1, // comment\n2,\n...,\n]"
        result = _clean_llm_json_artifacts(text)
        assert "//" not in result
        assert "..." not in result
        parsed = json.loads(result)
        assert parsed == [1, 2]


# ===================================================================
# to_bool  (from type_utils)
# ===================================================================


class TestToBool:
    """Cover every documented truthy/falsy string, types, defaults."""

    # --- truthy strings ---------------------------------------------

    @pytest.mark.parametrize("val", ["true", "True", "TRUE", "tRuE"])
    def test_true_variants(self, val):
        assert to_bool(val) is True

    @pytest.mark.parametrize("val", ["yes", "Yes", "YES"])
    def test_yes_variants(self, val):
        assert to_bool(val) is True

    def test_one_string(self):
        assert to_bool("1") is True

    @pytest.mark.parametrize("val", ["on", "On", "ON"])
    def test_on_variants(self, val):
        assert to_bool(val) is True

    @pytest.mark.parametrize("val", ["enabled", "Enabled", "ENABLED"])
    def test_enabled_variants(self, val):
        assert to_bool(val) is True

    # --- falsy strings ----------------------------------------------

    @pytest.mark.parametrize("val", ["false", "False", "FALSE"])
    def test_false_variants(self, val):
        assert to_bool(val) is False

    @pytest.mark.parametrize("val", ["no", "No", "NO"])
    def test_no_variants(self, val):
        assert to_bool(val) is False

    def test_zero_string(self):
        assert to_bool("0") is False

    @pytest.mark.parametrize("val", ["off", "Off", "OFF"])
    def test_off_variants(self, val):
        assert to_bool(val) is False

    @pytest.mark.parametrize("val", ["disabled", "Disabled", "DISABLED"])
    def test_disabled_variants(self, val):
        assert to_bool(val) is False

    # --- whitespace handling ----------------------------------------

    def test_leading_trailing_whitespace(self):
        assert to_bool("  true  ") is True

    def test_whitespace_false(self):
        assert to_bool("  false  ") is False

    # --- None uses default ------------------------------------------

    def test_none_default_false(self):
        assert to_bool(None) is False

    def test_none_default_true(self):
        assert to_bool(None, default=True) is True

    # --- bool pass-through ------------------------------------------

    def test_bool_true_passthrough(self):
        assert to_bool(True) is True

    def test_bool_false_passthrough(self):
        assert to_bool(False) is False

    # --- integer input ----------------------------------------------

    def test_int_one(self):
        assert to_bool(1) is True

    def test_int_zero(self):
        assert to_bool(0) is False

    def test_int_negative(self):
        """Negative int is truthy via bool()."""
        assert to_bool(-1) is True

    # --- unknown strings use the truthy set -------------------------

    def test_unknown_string_returns_false(self):
        """A string not in the truthy set returns False."""
        assert to_bool("maybe") is False

    def test_empty_string_returns_false(self):
        assert to_bool("") is False

    # --- default ignored for non-None values ------------------------

    def test_default_ignored_for_string(self):
        assert to_bool("false", default=True) is False

    def test_default_ignored_for_bool(self):
        assert to_bool(False, default=True) is False