from types import SimpleNamespace

from agent.codex_runtime import _record_codex_app_server_compaction
from agent.conversation_compression import COMPACTION_STATUS, compress_context
from agent.transports.codex_app_server_session import TurnResult


class FakeCodexSession:
    def __init__(self, result):
        self.result = result
        self.calls = 0
        self.closed = False

    def compact_thread(self):
        self.calls += 1
        return self.result

    def close(self):
        self.closed = True


class DummyAgent:
    def __init__(
        self,
        result,
        *,
        auto_compaction="native",
        codex_native_compaction=True,
    ):
        self.api_mode = "codex_app_server"
        self.codex_native_compaction_enabled = codex_native_compaction
        self.codex_app_server_auto_compaction = auto_compaction
        self.session_id = "hermes-session-1"
        self.platform = "cli"
        self._cached_system_prompt = "cached prompt"
        self._codex_session = FakeCodexSession(result)
        self.context_compressor = SimpleNamespace(
            compression_count=0,
            last_compression_rough_tokens=0,
            last_prompt_tokens=123,
            last_completion_tokens=45,
            awaiting_real_usage_after_compression=False,
        )
        self.statuses = []
        self.warnings = []
        self.events = []
        self.built_prompts = []

    def _emit_status(self, message):
        self.statuses.append(message)

    def _emit_warning(self, message):
        self.warnings.append(message)

    def _build_system_prompt(self, system_message):
        self.built_prompts.append(system_message)
        return "built prompt"

    def event_callback(self, name, payload):
        self.events.append((name, payload))


def test_codex_app_server_native_auto_mode_leaves_thread_compaction_to_codex():
    agent = DummyAgent(
        TurnResult(thread_id="thread-1", turn_id="compact-turn-1")
    )
    messages = [{"role": "user", "content": "hi"}]

    returned, prompt = compress_context(
        agent,
        messages,
        "system",
        approx_tokens=100000,
        task_id="test",
    )

    assert returned is messages
    assert prompt == "cached prompt"
    assert agent._codex_session.calls == 0
    assert agent.context_compressor.compression_count == 0
    assert agent.events == []


def test_codex_app_server_manual_compression_routes_to_codex_thread():
    agent = DummyAgent(
        TurnResult(thread_id="thread-1", turn_id="compact-turn-1")
    )
    messages = [
        {"role": "user", "content": "hi"},
        {"role": "assistant", "content": "hello"},
    ]

    returned, prompt = compress_context(
        agent,
        messages,
        "system",
        approx_tokens=100000,
        task_id="test",
        force=True,
    )

    assert returned is messages
    assert prompt == "cached prompt"
    assert agent._codex_session.calls == 1
    assert agent.context_compressor.compression_count == 1
    assert agent.context_compressor.last_compression_rough_tokens == 100000
    assert agent.context_compressor.last_prompt_tokens == -1
    assert agent.context_compressor.last_completion_tokens == 0
    assert agent.context_compressor.awaiting_real_usage_after_compression is True
    assert agent.events == [
        (
            "session:compress",
            {
                "platform": "cli",
                "session_id": "hermes-session-1",
                "old_session_id": "",
                "in_place": False,
                "compression_count": 1,
                "runtime": "codex_app_server",
                "thread_id": "thread-1",
                "turn_id": "compact-turn-1",
            },
        )
    ]


def test_codex_app_server_hermes_mode_auto_compression_routes_to_codex_thread():
    agent = DummyAgent(
        TurnResult(thread_id="thread-1", turn_id="compact-turn-1"),
        auto_compaction="hermes",
    )
    messages = [{"role": "user", "content": "hi"}]

    returned, prompt = compress_context(
        agent,
        messages,
        "system",
        approx_tokens=100000,
    )

    assert returned is messages
    assert prompt == "cached prompt"
    assert agent._codex_session.calls == 1
    assert agent.context_compressor.compression_count == 1


def test_codex_app_server_compression_failure_preserves_bookkeeping():
    agent = DummyAgent(TurnResult(error="compact failed"))
    messages = [{"role": "user", "content": "hi"}]

    returned, prompt = compress_context(
        agent,
        messages,
        "system",
        approx_tokens=100000,
        force=True,
    )

    assert returned is messages
    assert prompt == "cached prompt"
    assert agent._codex_session.calls == 1
    assert agent.context_compressor.compression_count == 0
    assert agent.context_compressor.last_prompt_tokens == 123
    assert agent.warnings


def test_codex_app_server_native_compaction_notice_emits_status_and_event():
    agent = DummyAgent(
        TurnResult(thread_id="thread-1", turn_id="normal-turn-1")
    )
    turn = TurnResult(
        thread_id="thread-1",
        turn_id="normal-turn-1",
        compacted=True,
    )

    recorded = _record_codex_app_server_compaction(agent, turn)

    assert recorded is True
    assert agent.context_compressor.compression_count == 1
    assert agent.statuses == [COMPACTION_STATUS]
    assert agent.events == [
        (
            "session:compress",
            {
                "platform": "cli",
                "session_id": "hermes-session-1",
                "old_session_id": "",
                "in_place": False,
                "compression_count": 1,
                "runtime": "codex_app_server",
                "thread_id": "thread-1",
                "turn_id": "normal-turn-1",
            },
        )
    ]