from __future__ import annotations

import runpy
from pathlib import Path

import pytest


ROOT = Path(__file__).resolve().parents[3]
SMOKE = runpy.run_path(ROOT / "scripts" / "smoke-python-runtime.py")


@pytest.mark.parametrize(
    ("prompt_name", "expected"),
    [
        ("SNAPSHOT_DIRECT_CHILD_PROMPT", "DIRECT_CHILD_OK"),
        ("SNAPSHOT_WORKFLOW_CHILD_PROMPT", "WORKFLOW_CHILD_OK"),
    ],
)
def test_child_prompt_precedes_runtime_context(prompt_name: str, expected: str) -> None:
    chunks = SMOKE["completion_chunks"]({
        "messages": [
            {"role": "user", "content": SMOKE[prompt_name]},
            {"role": "user", "content": "Current runtime context"},
        ],
    })

    assert any(
        choice.get("delta", {}).get("content") == expected
        for chunk in chunks
        for choice in chunk.get("choices", [])
    )


def test_mcp_smoke_requests_the_discovered_tool() -> None:
    chunks = SMOKE["completion_chunks"]({
        "messages": [{"role": "user", "content": SMOKE["MCP_PROMPT"]}],
        "tools": [{"type": "function", "function": {"name": "mcp__fixture__add"}}],
    })

    calls = [
        call
        for chunk in chunks
        for choice in chunk.get("choices", [])
        for call in choice.get("delta", {}).get("tool_calls", [])
    ]
    assert calls[0]["function"] == {
        "name": "mcp__fixture__add",
        "arguments": '{"a": 19, "b": 23}',
    }


def test_mcp_smoke_accepts_the_external_server_result() -> None:
    chunks = SMOKE["completion_chunks"]({
        "messages": [
            {"role": "user", "content": SMOKE["MCP_PROMPT"]},
            {
                "role": "assistant",
                "tool_calls": [{
                    "id": "mcp-add",
                    "type": "function",
                    "function": {"name": "mcp__fixture__add", "arguments": '{}'},
                }],
            },
            {"role": "tool", "tool_call_id": "mcp-add", "content": "42"},
        ],
    })

    assert any(
        choice.get("delta", {}).get("content") == SMOKE["MCP_TEXT"]
        for chunk in chunks
        for choice in chunk.get("choices", [])
    )


def test_snapshot_comparison_normalizes_only_session_generation_provenance() -> None:
    normalize = SMOKE["normalize_session_format_comparison"]
    expected = {
        "header": {"type": "session", "version": 0, "otherVersion": 7},
        "accepted": {
            "type": "session-log-deepseek/delivery-accepted",
            "data": {"sessionId": "s", "throughSeq": 4},
        },
        "source": {
            "kind": "session-reference",
            "references": [{"sessionId": "other", "capturedThroughSeq": 8}],
        },
    }
    actual = {
        "header": {"type": "session", "version": 1, "otherVersion": 7},
        "accepted": {
            "type": "session-log-deepseek/delivery-accepted",
            "data": {"sessionId": "s", "sessionFormatVersion": 1, "throughSeq": 4},
        },
        "source": {
            "kind": "session-reference",
            "references": [{
                "sessionId": "other",
                "capturedFormatVersion": 1,
                "capturedThroughSeq": 8,
            }],
        },
    }

    assert normalize(expected) == normalize(actual)
    assert normalize(expected)["header"]["otherVersion"] == 7


def test_snapshot_generation_names_select_highest_role_without_double_counting(
    tmp_path: Path,
) -> None:
    render = SMOKE["snapshot_session_filename"]
    select = SMOKE["selected_snapshot_session_files"]
    assert render(0, 0) == "session.jsonl"
    assert render(0, 2) == "session.v2.jsonl"
    assert render(3, 0) == "session.3.jsonl"
    assert render(3, 2) == "session.3.v2.jsonl"

    (tmp_path / "session.jsonl").write_text(
        '{"type":"session","version":0}\n', encoding="utf-8",
    )
    (tmp_path / "session.v1.jsonl").write_text(
        '{"type":"session","version":1}\n', encoding="utf-8",
    )
    (tmp_path / "session.1.jsonl").write_text(
        '{"type":"session","version":0}\n', encoding="utf-8",
    )

    assert {index: path.name for index, path in select(tmp_path).items()} == {
        0: "session.v1.jsonl",
        1: "session.1.jsonl",
    }


def test_snapshot_generation_filename_must_match_header(tmp_path: Path) -> None:
    (tmp_path / "session.v1.jsonl").write_text(
        '{"type":"session","version":0}\n', encoding="utf-8",
    )

    with pytest.raises(AssertionError, match="filename declares Session format v1"):
        SMOKE["selected_snapshot_session_files"](tmp_path)