from types import SimpleNamespace
from unittest.mock import AsyncMock, MagicMock
import sys

import pytest

from gateway.config import PlatformConfig


def _ensure_discord_mock():
    if "discord" in sys.modules and hasattr(sys.modules["discord"], "__file__"):
        return

    discord_mod = MagicMock()
    discord_mod.Intents.default.return_value = MagicMock()
    discord_mod.Client = MagicMock
    discord_mod.File = MagicMock
    discord_mod.DMChannel = type("DMChannel", (), {})
    discord_mod.Thread = type("Thread", (), {})
    discord_mod.ForumChannel = type("ForumChannel", (), {})
    discord_mod.ui = SimpleNamespace(View=object, button=lambda *a, **k: (lambda fn: fn), Button=object)
    discord_mod.ButtonStyle = SimpleNamespace(success=1, primary=2, secondary=2, danger=3, green=1, grey=2, blurple=2, red=3)
    discord_mod.Color = SimpleNamespace(orange=lambda: 1, green=lambda: 2, blue=lambda: 3, red=lambda: 4, purple=lambda: 5)
    discord_mod.Interaction = object
    discord_mod.Embed = MagicMock
    discord_mod.app_commands = SimpleNamespace(
        describe=lambda **kwargs: (lambda fn: fn),
        choices=lambda **kwargs: (lambda fn: fn),
        Choice=lambda **kwargs: SimpleNamespace(**kwargs),
    )

    ext_mod = MagicMock()
    commands_mod = MagicMock()
    commands_mod.Bot = MagicMock
    ext_mod.commands = commands_mod

    sys.modules.setdefault("discord", discord_mod)
    sys.modules.setdefault("discord.ext", ext_mod)
    sys.modules.setdefault("discord.ext.commands", commands_mod)


_ensure_discord_mock()

from gateway.platforms.discord import DiscordAdapter  # noqa: E402


@pytest.mark.asyncio
async def test_send_retries_without_reference_when_reply_target_is_system_message():
    adapter = DiscordAdapter(PlatformConfig(enabled=True, token="***"))

    reference_obj = object()
    ref_msg = SimpleNamespace(id=99, to_reference=MagicMock(return_value=reference_obj))
    sent_msg = SimpleNamespace(id=1234)
    send_calls = []

    async def fake_send(*, content, reference=None):
        send_calls.append({"content": content, "reference": reference})
        if len(send_calls) == 1:
            raise RuntimeError(
                "400 Bad Request (error code: 50035): Invalid Form Body\n"
                "In message_reference: Cannot reply to a system message"
            )
        return sent_msg

    channel = SimpleNamespace(
        fetch_message=AsyncMock(return_value=ref_msg),
        send=AsyncMock(side_effect=fake_send),
    )
    adapter._client = SimpleNamespace(
        get_channel=lambda _chat_id: channel,
        fetch_channel=AsyncMock(),
    )

    result = await adapter.send("555", "hello", reply_to="99")

    assert result.success is True
    assert result.message_id == "1234"
    assert channel.fetch_message.await_count == 1
    assert channel.send.await_count == 2
    ref_msg.to_reference.assert_called_once_with(fail_if_not_exists=False)
    assert send_calls[0]["reference"] is reference_obj
    assert send_calls[1]["reference"] is None


@pytest.mark.asyncio
async def test_send_retries_without_reference_when_reply_target_is_deleted():
    adapter = DiscordAdapter(PlatformConfig(enabled=True, token="***"))

    reference_obj = object()
    ref_msg = SimpleNamespace(id=99, to_reference=MagicMock(return_value=reference_obj))
    sent_msgs = [SimpleNamespace(id=1001), SimpleNamespace(id=1002)]
    send_calls = []

    async def fake_send(*, content, reference=None):
        send_calls.append({"content": content, "reference": reference})
        if len(send_calls) == 1:
            raise RuntimeError(
                "400 Bad Request (error code: 10008): Unknown Message"
            )
        return sent_msgs[len(send_calls) - 2]

    channel = SimpleNamespace(
        fetch_message=AsyncMock(return_value=ref_msg),
        send=AsyncMock(side_effect=fake_send),
    )
    adapter._client = SimpleNamespace(
        get_channel=lambda _chat_id: channel,
        fetch_channel=AsyncMock(),
    )

    long_text = "A" * (adapter.MAX_MESSAGE_LENGTH + 50)
    result = await adapter.send("555", long_text, reply_to="99")

    assert result.success is True
    assert result.message_id == "1001"
    assert channel.fetch_message.await_count == 1
    assert channel.send.await_count == 3
    ref_msg.to_reference.assert_called_once_with(fail_if_not_exists=False)
    assert send_calls[0]["reference"] is reference_obj
    assert send_calls[1]["reference"] is None
    assert send_calls[2]["reference"] is None


@pytest.mark.asyncio
async def test_send_does_not_retry_on_unrelated_errors():
    """Regression guard: errors unrelated to the reply reference (e.g. 50013
    Missing Permissions) must NOT trigger the no-reference retry path — they
    should propagate out of the per-chunk loop and surface as a failed
    SendResult so the caller sees the real problem instead of a silent retry.
    """
    adapter = DiscordAdapter(PlatformConfig(enabled=True, token="***"))

    reference_obj = object()
    ref_msg = SimpleNamespace(id=99, to_reference=MagicMock(return_value=reference_obj))
    send_calls = []

    async def fake_send(*, content, reference=None):
        send_calls.append({"content": content, "reference": reference})
        raise RuntimeError(
            "403 Forbidden (error code: 50013): Missing Permissions"
        )

    channel = SimpleNamespace(
        fetch_message=AsyncMock(return_value=ref_msg),
        send=AsyncMock(side_effect=fake_send),
    )
    adapter._client = SimpleNamespace(
        get_channel=lambda _chat_id: channel,
        fetch_channel=AsyncMock(),
    )

    result = await adapter.send("555", "hello", reply_to="99")

    # Outer except in adapter.send() wraps propagated errors as SendResult.
    assert result.success is False
    assert "50013" in (result.error or "")
    # Only the first attempt happens — no reference-retry replay.
    assert channel.send.await_count == 1
    assert send_calls[0]["reference"] is reference_obj