"""Tests for backend tool-call summary extraction used by WebUI session persistence."""
import json
import pathlib
import sys

REPO_ROOT = pathlib.Path(__file__).parent.parent.resolve()
sys.path.insert(0, str(REPO_ROOT))

from api.streaming import _extract_tool_calls_from_messages, _tool_result_snippet


def test_extract_tool_calls_from_openai_message_linkage():
    messages = [
        {"role": "user", "content": "ls"},
        {
            "role": "assistant",
            "content": "",
            "tool_calls": [{
                "id": "call-1",
                "function": {"name": "terminal", "arguments": '{"command":"ls"}'},
            }],
        },
        {
            "role": "tool",
            "tool_call_id": "call-1",
            "content": '{"output":"file.txt","exit_code":0}',
        },
    ]
    result = _extract_tool_calls_from_messages(messages)
    assert len(result) == 1
    assert result[0]["name"] == "terminal"
    assert result[0]["assistant_msg_idx"] == 1
    assert result[0]["snippet"] == "file.txt"


def test_tool_result_snippet_allows_frontend_show_more_threshold_but_stays_bounded():
    """Persisted snippets should be long enough for frontend Show more but capped."""
    medium_output = "m" * 1200
    huge_output = "h" * 5000

    medium_snippet = _tool_result_snippet(json.dumps({"output": medium_output}))
    huge_snippet = _tool_result_snippet(json.dumps({"output": huge_output}))

    assert len(medium_snippet) == 1200
    assert len(medium_snippet) > 800
    assert len(huge_snippet) == 4000


def test_extract_tool_calls_persists_show_more_sized_snippets_with_bounded_cap():
    """Tool-call summaries should store >800-char snippets without growing unbounded."""
    long_output = "x" * 1200
    huge_output = "y" * 5000
    messages = [
        {
            "role": "assistant",
            "content": "",
            "tool_calls": [
                {
                    "id": "call-long",
                    "function": {
                        "name": "read_file",
                        "arguments": '{"path":"/tmp/medium.log"}',
                    },
                },
                {
                    "id": "call-huge",
                    "function": {
                        "name": "terminal",
                        "arguments": '{"command":"yes"}',
                    },
                },
            ],
        },
        {
            "role": "tool",
            "tool_call_id": "call-long",
            "content": json.dumps({"output": long_output}),
        },
        {
            "role": "tool",
            "tool_call_id": "call-huge",
            "content": json.dumps({"output": huge_output}),
        },
    ]

    result = _extract_tool_calls_from_messages(messages)

    assert len(result) == 2
    assert len(result[0]["snippet"]) == 1200
    assert len(result[0]["snippet"]) > 800
    assert len(result[1]["snippet"]) == 4000


def test_extract_tool_calls_falls_back_to_live_progress_when_ids_missing():
    messages = [
        {"role": "user", "content": "write spec"},
        {"role": "assistant", "content": "Starting."},
        {"role": "tool", "content": '{"bytes_written":4955}'},
        {"role": "assistant", "content": ""},
    ]
    live_tool_calls = [{"name": "write_file", "args": {"path": "/tmp/SPEC.md"}}]
    result = _extract_tool_calls_from_messages(messages, live_tool_calls=live_tool_calls)
    assert len(result) == 1
    assert result[0]["name"] == "write_file"
    assert result[0]["assistant_msg_idx"] == 1
    assert "bytes_written" in result[0]["snippet"]
    assert result[0]["args"]["path"] == "/tmp/SPEC.md"


def test_extract_tool_calls_preserves_mixed_linked_and_fallback_results():
    messages = [
        {
            "role": "assistant",
            "content": "",
            "tool_calls": [{"id": "call-1", "function": {"name": "terminal", "arguments": '{"command":"pwd"}'}}],
        },
        {"role": "tool", "tool_call_id": "call-1", "content": '{"output":"/tmp"}'},
        {"role": "assistant", "content": "Next"},
        {"role": "tool", "content": '{"result":"saved"}'},
    ]
    live_tool_calls = [
        {"name": "terminal", "args": {"command": "pwd"}},
        {"name": "write_file", "args": {"path": "/tmp/out.txt"}},
    ]
    result = _extract_tool_calls_from_messages(messages, live_tool_calls=live_tool_calls)
    assert len(result) == 2
    assert result[0]["name"] == "terminal"
    assert result[1]["name"] == "write_file"
    assert result[1]["assistant_msg_idx"] == 2
    assert result[1]["snippet"] == "saved"