"""E2E tests for session configuration including model capabilities overrides."""

import base64
import os
import uuid

import pytest

from copilot import ModelCapabilitiesOverride, ModelSupportsOverride
from copilot.session import PermissionHandler

from .testharness import E2ETestContext

pytestmark = pytest.mark.asyncio(loop_scope="module")

PROVIDER_HEADER_NAME = "x-copilot-sdk-provider-header"
CLIENT_NAME = "python-public-surface-client"


def has_image_url_content(exchanges: list[dict]) -> bool:
    """Check if any exchange contains an image_url content part in user messages."""
    for ex in exchanges:
        for msg in ex.get("request", {}).get("messages", []):
            if msg.get("role") == "user" and isinstance(msg.get("content"), list):
                if any(p.get("type") == "image_url" for p in msg["content"]):
                    return True
    return False


def _make_proxy_provider(proxy_url: str, header_value: str) -> dict:
    return {
        "type": "openai",
        "base_url": proxy_url,
        "api_key": "test-provider-key",
        "headers": {PROVIDER_HEADER_NAME: header_value},
    }


def _normalize_headers(headers) -> dict[str, str]:
    if isinstance(headers, list):
        flat: dict[str, str] = {}
        for entry in headers:
            if isinstance(entry, dict):
                key = entry.get("name") or entry.get("key")
                value = entry.get("value")
                if key is not None:
                    flat[str(key).lower()] = str(value)
        return flat
    if isinstance(headers, dict):
        flat = {}
        for key, value in headers.items():
            if isinstance(value, list):
                flat[str(key).lower()] = ", ".join(str(v) for v in value)
            else:
                flat[str(key).lower()] = str(value)
        return flat
    return {}


def _assert_header_contains(headers, name: str, expected: str) -> None:
    flat = _normalize_headers(headers)
    actual = flat.get(name.lower(), "")
    assert expected in actual, (
        f"Expected header {name!r} to contain {expected!r}; got {actual!r}. All headers: {flat!r}"
    )


def _get_system_message(exchange: dict) -> str:
    for msg in exchange.get("request", {}).get("messages", []):
        if msg.get("role") == "system":
            value = msg.get("content")
            if isinstance(value, str):
                return value
    return ""


def _get_tool_names(exchange: dict) -> list[str]:
    tools = exchange.get("request", {}).get("tools") or []
    names: list[str] = []
    for tool in tools:
        function = tool.get("function") if isinstance(tool, dict) else None
        if isinstance(function, dict):
            name = function.get("name")
            if isinstance(name, str):
                names.append(name)
    return names


PNG_1X1 = base64.b64decode(
    "iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+M9QDwADhgGAWjR9awAAAABJRU5ErkJggg=="
)
VIEW_IMAGE_PROMPT = "Use the view tool to look at the file test.png and describe what you see"


class TestSessionConfig:
    """Tests for session configuration including model capabilities overrides."""

    async def test_vision_disabled_then_enabled_via_setmodel(self, ctx: E2ETestContext):
        png_path = os.path.join(ctx.work_dir, "test.png")
        with open(png_path, "wb") as f:
            f.write(PNG_1X1)

        session = await ctx.client.create_session(
            on_permission_request=PermissionHandler.approve_all,
            model_capabilities=ModelCapabilitiesOverride(
                supports=ModelSupportsOverride(vision=False)
            ),
        )

        # Turn 1: vision off — no image_url expected
        await session.send_and_wait(VIEW_IMAGE_PROMPT)
        traffic_after_t1 = await ctx.get_exchanges()
        assert not has_image_url_content(traffic_after_t1)

        # Switch vision on
        await session.set_model(
            "claude-sonnet-4.5",
            model_capabilities=ModelCapabilitiesOverride(
                supports=ModelSupportsOverride(vision=True)
            ),
        )

        # Turn 2: vision on — image_url expected in new exchanges
        await session.send_and_wait(VIEW_IMAGE_PROMPT)
        traffic_after_t2 = await ctx.get_exchanges()
        new_exchanges = traffic_after_t2[len(traffic_after_t1) :]
        assert has_image_url_content(new_exchanges)

        await session.disconnect()

    async def test_vision_enabled_then_disabled_via_setmodel(self, ctx: E2ETestContext):
        png_path = os.path.join(ctx.work_dir, "test.png")
        with open(png_path, "wb") as f:
            f.write(PNG_1X1)

        session = await ctx.client.create_session(
            on_permission_request=PermissionHandler.approve_all,
            model_capabilities=ModelCapabilitiesOverride(
                supports=ModelSupportsOverride(vision=True)
            ),
        )

        # Turn 1: vision on — image_url expected
        await session.send_and_wait(VIEW_IMAGE_PROMPT)
        traffic_after_t1 = await ctx.get_exchanges()
        assert has_image_url_content(traffic_after_t1)

        # Switch vision off
        await session.set_model(
            "claude-sonnet-4.5",
            model_capabilities=ModelCapabilitiesOverride(
                supports=ModelSupportsOverride(vision=False)
            ),
        )

        # Turn 2: vision off — no image_url expected in new exchanges
        await session.send_and_wait(VIEW_IMAGE_PROMPT)
        traffic_after_t2 = await ctx.get_exchanges()
        new_exchanges = traffic_after_t2[len(traffic_after_t1) :]
        assert not has_image_url_content(new_exchanges)

        await session.disconnect()

    async def test_should_use_custom_sessionid(self, ctx: E2ETestContext):
        from copilot.generated.session_events import SessionStartData

        requested_session_id = str(uuid.uuid4())
        session = await ctx.client.create_session(
            on_permission_request=PermissionHandler.approve_all,
            session_id=requested_session_id,
        )
        assert session.session_id == requested_session_id

        messages = await session.get_events()
        assert messages
        start_event = messages[0]
        assert isinstance(start_event.data, SessionStartData)
        assert start_event.data.session_id == requested_session_id

        await session.disconnect()

    async def test_should_forward_clientname_in_useragent(self, ctx: E2ETestContext):
        session = await ctx.client.create_session(
            on_permission_request=PermissionHandler.approve_all,
            client_name=CLIENT_NAME,
        )

        await session.send_and_wait("What is 1+1?")

        exchanges = await ctx.get_exchanges()
        assert exchanges
        _assert_header_contains(exchanges[-1].get("requestHeaders"), "user-agent", CLIENT_NAME)

        await session.disconnect()

    async def test_should_forward_custom_provider_headers_on_create(self, ctx: E2ETestContext):
        session = await ctx.client.create_session(
            on_permission_request=PermissionHandler.approve_all,
            model="claude-sonnet-4.5",
            provider=_make_proxy_provider(ctx.proxy_url, "create-provider-header"),
        )

        message = await session.send_and_wait("What is 1+1?")
        assert "2" in (message.data.content or "")

        exchanges = await ctx.get_exchanges()
        assert exchanges
        headers = exchanges[-1].get("requestHeaders")
        _assert_header_contains(headers, "authorization", "Bearer test-provider-key")
        _assert_header_contains(headers, PROVIDER_HEADER_NAME, "create-provider-header")

        await session.disconnect()

    async def test_should_forward_custom_provider_headers_on_resume(self, ctx: E2ETestContext):
        session1 = await ctx.client.create_session(
            on_permission_request=PermissionHandler.approve_all,
        )
        session_id = session1.session_id

        session2 = await ctx.client.resume_session(
            session_id,
            on_permission_request=PermissionHandler.approve_all,
            model="claude-sonnet-4.5",
            provider=_make_proxy_provider(ctx.proxy_url, "resume-provider-header"),
        )

        message = await session2.send_and_wait("What is 2+2?")
        assert "4" in (message.data.content or "")

        exchanges = await ctx.get_exchanges()
        assert exchanges
        headers = exchanges[-1].get("requestHeaders")
        _assert_header_contains(headers, "authorization", "Bearer test-provider-key")
        _assert_header_contains(headers, PROVIDER_HEADER_NAME, "resume-provider-header")

        await session2.disconnect()
        await session1.disconnect()

    async def test_should_forward_provider_wire_model(self, ctx: E2ETestContext):
        # Verifies that ProviderConfig.wire_model overrides the model name sent
        # to the provider API, while SessionConfig.model still drives runtime
        # configuration lookup (capabilities, prompts, reasoning behavior).
        # max_output_tokens is also set here to confirm the SDK accepts it
        # without serialization errors; the CLI does not echo it as
        # `max_tokens` on the OpenAI-style wire request, so we don't assert on
        # it directly (see unit tests for serialization coverage).
        session = await ctx.client.create_session(
            on_permission_request=PermissionHandler.approve_all,
            model="claude-sonnet-4.5",
            provider={
                "type": "openai",
                "base_url": ctx.proxy_url,
                "api_key": "test-provider-key",
                "wire_model": "test-wire-model",
                "max_output_tokens": 1024,
            },
        )

        await session.send_and_wait("What is 1+1?")

        exchanges = await ctx.get_exchanges()
        assert len(exchanges) == 1
        request = exchanges[0]["request"]
        assert request["model"] == "test-wire-model"

        await session.disconnect()

    async def test_should_use_provider_model_id_as_wire_model(self, ctx: E2ETestContext):
        # ProviderConfig.model_id drives both the runtime resolved model AND the wire
        # model when wire_model is not specified. SessionConfig.model is intentionally
        # omitted so that model_id is the only model source.
        session = await ctx.client.create_session(
            on_permission_request=PermissionHandler.approve_all,
            provider={
                "type": "openai",
                "base_url": ctx.proxy_url,
                "api_key": "test-provider-key",
                "model_id": "claude-sonnet-4.5",
            },
        )

        await session.send_and_wait("What is 1+1?")

        exchanges = await ctx.get_exchanges()
        assert len(exchanges) == 1
        assert exchanges[0]["request"]["model"] == "claude-sonnet-4.5"

        await session.disconnect()

    async def test_should_use_workingdirectory_for_tool_execution(self, ctx: E2ETestContext):
        sub_dir = os.path.join(ctx.work_dir, "subproject")
        os.makedirs(sub_dir, exist_ok=True)
        with open(os.path.join(sub_dir, "marker.txt"), "w", encoding="utf-8") as f:
            f.write("I am in the subdirectory")

        session = await ctx.client.create_session(
            on_permission_request=PermissionHandler.approve_all,
            working_directory=sub_dir,
        )

        message = await session.send_and_wait("Read the file marker.txt and tell me what it says")
        assert "subdirectory" in (message.data.content or "")

        await session.disconnect()

    async def test_should_apply_workingdirectory_on_session_resume(self, ctx: E2ETestContext):
        sub_dir = os.path.join(ctx.work_dir, "resume-subproject")
        os.makedirs(sub_dir, exist_ok=True)
        with open(os.path.join(sub_dir, "resume-marker.txt"), "w", encoding="utf-8") as f:
            f.write("I am in the resume working directory")

        session1 = await ctx.client.create_session(
            on_permission_request=PermissionHandler.approve_all,
        )
        session_id = session1.session_id

        session2 = await ctx.client.resume_session(
            session_id,
            on_permission_request=PermissionHandler.approve_all,
            working_directory=sub_dir,
        )

        message = await session2.send_and_wait(
            "Read the file resume-marker.txt and tell me what it says"
        )
        assert "resume working directory" in (message.data.content or "")

        await session2.disconnect()
        await session1.disconnect()

    async def test_should_apply_systemmessage_on_session_resume(self, ctx: E2ETestContext):
        session1 = await ctx.client.create_session(
            on_permission_request=PermissionHandler.approve_all,
        )
        session_id = session1.session_id

        resume_instruction = "End the response with RESUME_SYSTEM_MESSAGE_SENTINEL."
        session2 = await ctx.client.resume_session(
            session_id,
            on_permission_request=PermissionHandler.approve_all,
            system_message={"mode": "append", "content": resume_instruction},
        )

        message = await session2.send_and_wait("What is 1+1?")
        assert "RESUME_SYSTEM_MESSAGE_SENTINEL" in (message.data.content or "")

        exchanges = await ctx.get_exchanges()
        assert exchanges
        assert resume_instruction in _get_system_message(exchanges[-1])

        await session2.disconnect()
        await session1.disconnect()

    async def test_should_apply_instruction_directories_on_create(self, ctx: E2ETestContext):
        project_dir = os.path.join(ctx.work_dir, "instruction-create-project")
        instruction_dir = os.path.join(ctx.work_dir, "extra-create-instructions")
        instruction_files_dir = os.path.join(instruction_dir, ".github", "instructions")
        sentinel = "PY_CREATE_INSTRUCTION_DIRECTORIES_SENTINEL"
        os.makedirs(project_dir, exist_ok=True)
        os.makedirs(instruction_files_dir, exist_ok=True)
        with open(
            os.path.join(instruction_files_dir, "extra.instructions.md"), "w", encoding="utf-8"
        ) as f:
            f.write(f"Always include {sentinel}.")

        session = await ctx.client.create_session(
            on_permission_request=PermissionHandler.approve_all,
            working_directory=project_dir,
            instruction_directories=[instruction_dir],
        )

        await session.send_and_wait("What is 1+1?")

        exchanges = await ctx.get_exchanges()
        assert exchanges
        assert sentinel in _get_system_message(exchanges[-1])

        await session.disconnect()

    async def test_should_apply_instruction_directories_on_resume(self, ctx: E2ETestContext):
        project_dir = os.path.join(ctx.work_dir, "instruction-resume-project")
        instruction_dir = os.path.join(ctx.work_dir, "extra-resume-instructions")
        instruction_files_dir = os.path.join(instruction_dir, ".github", "instructions")
        sentinel = "PY_RESUME_INSTRUCTION_DIRECTORIES_SENTINEL"
        os.makedirs(project_dir, exist_ok=True)
        os.makedirs(instruction_files_dir, exist_ok=True)
        with open(
            os.path.join(instruction_files_dir, "extra.instructions.md"), "w", encoding="utf-8"
        ) as f:
            f.write(f"Always include {sentinel}.")

        session1 = await ctx.client.create_session(
            on_permission_request=PermissionHandler.approve_all,
            working_directory=project_dir,
        )

        session2 = await ctx.client.resume_session(
            session1.session_id,
            on_permission_request=PermissionHandler.approve_all,
            working_directory=project_dir,
            instruction_directories=[instruction_dir],
        )

        await session2.send_and_wait("What is 1+1?")

        exchanges = await ctx.get_exchanges()
        assert exchanges
        assert sentinel in _get_system_message(exchanges[-1])

        await session2.disconnect()
        await session1.disconnect()

    async def test_should_apply_availabletools_on_session_resume(self, ctx: E2ETestContext):
        session1 = await ctx.client.create_session(
            on_permission_request=PermissionHandler.approve_all,
        )
        session_id = session1.session_id

        session2 = await ctx.client.resume_session(
            session_id,
            on_permission_request=PermissionHandler.approve_all,
            available_tools=["view"],
        )

        try:
            await session2.send("What is 1+1?")

            exchanges = await ctx.wait_for_exchanges()
            assert _get_tool_names(exchanges[-1]) == ["view"]
        finally:
            await session2.disconnect()
            await session1.disconnect()