"""Unit tests for the executor's pure helpers (encoding, pagination, redaction)."""

from __future__ import annotations

import pytest

from aegis_gitea_mcp.gitea.encoding import (
    SLASH_PATH_PARAMS,
    ArgumentError,
    check_segments,
    render_path,
    render_raw_path,
    sensitive_body_values,
    validate_sudo,
)
from aegis_gitea_mcp.gitea.pagination import build_pagination, parse_link_header
from aegis_gitea_mcp.gitea.redaction import normalize_secrets, redact_exact, redact_text
from tests.test_executor_helpers import GET_BRANCH, GET_RAW_FILE, PULL_DIFF

# Encoding


def test_slash_parameter_set_is_documented_and_minimal() -> None:
    assert {"filepath", "branch", "ref", "basehead", "head", "tag"} == SLASH_PATH_PARAMS


def test_render_path_returns_encoded_and_display_forms() -> None:
    encoded, display = render_path(
        GET_RAW_FILE, {"owner": "o", "repo": "r", "filepath": "a b/c#"[:-1]}
    )

    assert encoded == "/repos/o/r/raw/a%20b/c"
    assert display == "/repos/o/r/raw/a b/c"


def test_render_path_repeated_use_of_integers() -> None:
    encoded, _ = render_path(PULL_DIFF, {"owner": "o", "repo": "r", "index": 3, "diffType": "diff"})

    assert encoded == "/repos/o/r/pulls/3.diff"


def test_branch_with_slashes_is_not_quoted_but_other_chars_are() -> None:
    encoded, _ = render_path(GET_BRANCH, {"owner": "o", "repo": "r", "branch": "fix/a+b c"})

    assert encoded.endswith("/branches/fix/a%2Bb%20c")


@pytest.mark.parametrize("path", ["/user", "/repos/o/r/issues", "/a/b.c/d-e_f"])
def test_raw_path_accepts_plain_paths(path: str) -> None:
    assert render_raw_path(path) == (path, path)


def test_raw_path_encodes_non_ascii_but_displays_it_raw() -> None:
    assert render_raw_path("/repos/ö/r") == ("/repos/%C3%B6/r", "/repos/ö/r")


@pytest.mark.parametrize("value", ["a", "a b", "ünï", "a.b", "a..b", ".hidden", "-x"])
def test_check_segments_accepts(value: str) -> None:
    check_segments(value, "v")


@pytest.mark.parametrize("value", ["", ".", "..", "a/./b", "a/../b", "/a", "a/", "a\\b", "a%b"])
def test_check_segments_rejects(value: str) -> None:
    with pytest.raises(ArgumentError):
        check_segments(value, "v")


def test_validate_sudo() -> None:
    assert validate_sudo(None) is None
    assert validate_sudo("Bob_1.x-y") == "Bob_1.x-y"
    with pytest.raises(ArgumentError):
        validate_sudo("bob@example.com")


def test_sensitive_body_values_variants() -> None:
    assert sensitive_body_values({"data": 5}, secret_data=True) == []
    assert sensitive_body_values({"data": ""}, secret_data=True) == []
    assert sensitive_body_values("text", secret_data=True) == []
    assert sensitive_body_values({"data": "x"}, secret_data=False) == []
    assert sensitive_body_values({"data": "xy"}, secret_data=True) == ["xy"]
    assert sensitive_body_values({"PassWord": "abcd", "n": 1}, secret_data=False) == ["abcd"]
    assert sensitive_body_values({"password": "abc"}, secret_data=False) == []
    assert sensitive_body_values({"password": 12345}, secret_data=False) == []


# Pagination


def test_parse_link_header() -> None:
    header = (
        '<https://g/api?page=2&limit=5>; rel="next", <https://g/api?page=9>; rel=last, '
        '<https://g/api?page=x&limit=0>; rel="prev first", <https://g/api?page=3>; title="t"'
    )

    links = parse_link_header(header)

    assert links["next"] == {"page": 2, "limit": 5}
    assert links["last"] == {"page": 9, "limit": None}
    assert links["prev"] == {"page": None, "limit": None}
    assert links["first"] == links["prev"]
    assert len(links) == 4
    assert parse_link_header(None) == {}
    assert parse_link_header("garbage") == {}


def test_build_pagination_nothing_to_report() -> None:
    assert build_pagination({}, requested_page=None, requested_limit=None, paginated=False) is None


def test_build_pagination_limit_from_links_and_garbage_total() -> None:
    result = build_pagination(
        {"link": '<https://g/?page=2&limit=7>; rel="last"', "x-total-count": "many"},
        requested_page="x",
        requested_limit=None,
        paginated=True,
    )

    assert result == {
        "page": 1,
        "limit": 7,
        "total_count": None,
        "next_page": None,
        "last_page": 2,
    }


def test_build_pagination_page_derived_from_next_of_two() -> None:
    result = build_pagination(
        {"link": '<https://g/?page=1>; rel="next"'},
        requested_page=None,
        requested_limit=None,
        paginated=True,
    )

    assert result is not None
    assert result["page"] == 1


# Redaction


def test_normalize_secrets_orders_longest_first_and_drops_empty() -> None:
    assert normalize_secrets(["ab", None, "", "abcd", "ab"]) == ("abcd", "ab")


def test_redact_text_prefers_longer_secret() -> None:
    assert redact_text("xx abcd ab", ("abcd", "ab")) == "xx [REDACTED] [REDACTED]"


def test_redact_exact_covers_all_container_types() -> None:
    value = {"k-sec": ("sec", ["sec", 1, None, True]), "n": 2.5}

    assert redact_exact(value, ("sec",)) == {
        "k-[REDACTED]": ["[REDACTED]", ["[REDACTED]", 1, None, True]],
        "n": 2.5,
    }
    assert redact_exact(value, ()) is value