from __future__ import annotations

import json
from typing import Any

import pytest
from typing_extensions import TypedDict

from cai.sdk.agents import (
    Agent,
    GuardrailFunctionOutput,
    Handoff,
    HandoffInputData,
    InputGuardrail,
    InputGuardrailTripwireTriggered,
    OutputGuardrail,
    OutputGuardrailTripwireTriggered,
    RunContextWrapper,
    Runner,
    UserError,
    handoff,
)
from cai.sdk.agents.items import RunItem
from cai.sdk.agents.run import RunConfig
from cai.sdk.agents.stream_events import AgentUpdatedStreamEvent

from tests.fake_model import FakeModel
from tests.core.test_responses import (
    get_final_output_message,
    get_function_tool,
    get_function_tool_call,
    get_handoff_tool_call,
    get_text_input_item,
    get_text_message,
)


@pytest.mark.asyncio
async def test_simple_first_run():
    model = FakeModel()
    agent = Agent(
        name="test",
        model=model,
    )
    model.set_next_output([get_text_message("first")])

    result = Runner.run_streamed(agent, input="test")
    async for _ in result.stream_events():
        pass

    assert result.input == "test"
    assert len(result.new_items) == 1, "exactly one item should be generated"
    assert result.final_output == "first"
    assert len(result.raw_responses) == 1, "exactly one model response should be generated"
    assert result.raw_responses[0].output == [get_text_message("first")]
    assert result.last_agent == agent

    assert len(result.to_input_list()) == 2, "should have original input and generated item"

    model.set_next_output([get_text_message("second")])

    result = Runner.run_streamed(
        agent, input=[get_text_input_item("message"), get_text_input_item("another_message")]
    )
    async for _ in result.stream_events():
        pass

    assert len(result.new_items) == 1, "exactly one item should be generated"
    assert result.final_output == "second"
    assert len(result.raw_responses) == 1, "exactly one model response should be generated"
    assert len(result.to_input_list()) == 3, "should have original input and generated item"


@pytest.mark.asyncio
async def test_subsequent_runs():
    model = FakeModel()
    agent = Agent(
        name="test",
        model=model,
    )
    model.set_next_output([get_text_message("third")])

    result = Runner.run_streamed(agent, input="test")
    async for _ in result.stream_events():
        pass

    assert result.input == "test"
    assert len(result.new_items) == 1, "exactly one item should be generated"
    assert len(result.to_input_list()) == 2, "should have original input and generated item"

    model.set_next_output([get_text_message("fourth")])

    result = Runner.run_streamed(agent, input=result.to_input_list())
    async for _ in result.stream_events():
        pass

    assert len(result.input) == 2, f"should have previous input but got {result.input}"
    assert len(result.new_items) == 1, "exactly one item should be generated"
    assert result.final_output == "fourth"
    assert len(result.raw_responses) == 1, "exactly one model response should be generated"
    assert result.raw_responses[0].output == [get_text_message("fourth")]
    assert result.last_agent == agent
    assert len(result.to_input_list()) == 3, "should have original input and generated items"


@pytest.mark.asyncio
async def test_tool_call_runs():
    model = FakeModel()
    agent = Agent(
        name="test",
        model=model,
        tools=[get_function_tool("foo", "tool_result")],
    )

    model.add_multiple_turn_outputs(
        [
            # First turn: a message and tool call
            [get_text_message("a_message"), get_function_tool_call("foo", json.dumps({"a": "b"}))],
            # Second turn: text message
            [get_text_message("done")],
        ]
    )

    result = Runner.run_streamed(agent, input="user_message")
    async for _ in result.stream_events():
        pass

    assert result.final_output == "done"
    assert len(result.raw_responses) == 2, (
        "should have two responses: the first which produces a tool call, and the second which"
        "handles the tool result"
    )

    assert len(result.to_input_list()) == 5, (
        "should have five inputs: the original input, the message, the tool call, the tool result "
        "and the done message"
    )


@pytest.mark.asyncio
async def test_handoffs():
    model = FakeModel()
    agent_1 = Agent(
        name="test",
        model=model,
    )
    agent_2 = Agent(
        name="test",
        model=model,
    )
    agent_3 = Agent(
        name="test",
        model=model,
        handoffs=[agent_1, agent_2],
        tools=[get_function_tool("some_function", "result")],
    )

    model.add_multiple_turn_outputs(
        [
            # First turn: a tool call
            [get_function_tool_call("some_function", json.dumps({"a": "b"}))],
            # Second turn: a message and a handoff
            [get_text_message("a_message"), get_handoff_tool_call(agent_1)],
            # Third turn: text message
            [get_text_message("done")],
        ]
    )

    result = Runner.run_streamed(agent_3, input="user_message")
    async for _ in result.stream_events():
        pass

    assert result.final_output == "done"
    assert len(result.raw_responses) == 3, "should have three model responses"
    assert len(result.to_input_list()) == 7, (
        "should have 7 inputs: orig input, tool call, tool result, message, handoff, handoff"
        "result, and done message"
    )
    assert result.last_agent == agent_1, "should have handed off to agent_1"


class Foo(TypedDict):
    bar: str


@pytest.mark.asyncio
async def test_structured_output():
    model = FakeModel()
    agent_1 = Agent(
        name="test",
        model=model,
        tools=[get_function_tool("bar", "bar_result")],
        output_type=Foo,
    )

    agent_2 = Agent(
        name="test",
        model=model,
        tools=[get_function_tool("foo", "foo_result")],
        handoffs=[agent_1],
    )

    model.add_multiple_turn_outputs(
        [
            # First turn: a tool call
            [get_function_tool_call("foo", json.dumps({"bar": "baz"}))],
            # Second turn: a message and a handoff
            [get_text_message("a_message"), get_handoff_tool_call(agent_1)],
            # Third turn: tool call and structured output
            [
                get_function_tool_call("bar", json.dumps({"bar": "baz"})),
                get_final_output_message(json.dumps(Foo(bar="baz"))),
            ],
        ]
    )

    result = Runner.run_streamed(
        agent_2,
        input=[
            get_text_input_item("user_message"),
            get_text_input_item("another_message"),
        ],
    )
    async for _ in result.stream_events():
        pass

    assert result.final_output == Foo(bar="baz")
    assert len(result.raw_responses) == 3, "should have three model responses"
    assert len(result.to_input_list()) == 10, (
        "should have input: 2 orig inputs, function call, function call result, message, handoff, "
        "handoff output, tool call, tool call result, final output"
    )

    assert result.last_agent == agent_1, "should have handed off to agent_1"
    assert result.final_output == Foo(bar="baz"), "should have structured output"


def remove_new_items(handoff_input_data: HandoffInputData) -> HandoffInputData:
    return HandoffInputData(
        input_history=handoff_input_data.input_history,
        pre_handoff_items=(),
        new_items=(),
    )


@pytest.mark.asyncio
async def test_handoff_filters():
    model = FakeModel()
    agent_1 = Agent(
        name="test",
        model=model,
    )
    agent_2 = Agent(
        name="test",
        model=model,
        handoffs=[
            handoff(
                agent=agent_1,
                input_filter=remove_new_items,
            )
        ],
    )

    model.add_multiple_turn_outputs(
        [
            [get_text_message("1"), get_text_message("2"), get_handoff_tool_call(agent_1)],
            [get_text_message("last")],
        ]
    )

    result = Runner.run_streamed(agent_2, input="user_message")
    async for _ in result.stream_events():
        pass

    assert result.final_output == "last"
    assert len(result.raw_responses) == 2, "should have two model responses"
    assert (
        len(result.to_input_list()) == 2
    ), "should only have 2 inputs: orig input and last message"


@pytest.mark.asyncio
async def test_async_input_filter_fails():
    # DO NOT rename this without updating pyproject.toml

    model = FakeModel()
    agent_1 = Agent(
        name="test",
        model=model,
    )

    async def on_invoke_handoff(_ctx: RunContextWrapper[Any], _input: str) -> Agent[Any]:
        return agent_1

    async def invalid_input_filter(data: HandoffInputData) -> HandoffInputData:
        return data  # pragma: no cover

    agent_2 = Agent[None](
        name="test",
        model=model,
        handoffs=[
            Handoff(
                tool_name=Handoff.default_tool_name(agent_1),
                tool_description=Handoff.default_tool_description(agent_1),
                input_json_schema={},
                on_invoke_handoff=on_invoke_handoff,
                agent_name=agent_1.name,
                # Purposely ignoring the type error here to simulate invalid input
                input_filter=invalid_input_filter,  # type: ignore
            )
        ],
    )

    model.add_multiple_turn_outputs(
        [
            [get_text_message("1"), get_text_message("2"), get_handoff_tool_call(agent_1)],
            [get_text_message("last")],
        ]
    )

    with pytest.raises(UserError):
        result = Runner.run_streamed(agent_2, input="user_message")
        async for _ in result.stream_events():
            pass


@pytest.mark.asyncio
async def test_invalid_input_filter_fails():
    model = FakeModel()
    agent_1 = Agent(
        name="test",
        model=model,
    )

    async def on_invoke_handoff(_ctx: RunContextWrapper[Any], _input: str) -> Agent[Any]:
        return agent_1

    def invalid_input_filter(data: HandoffInputData) -> HandoffInputData:
        # Purposely returning a string to simulate invalid output
        return "foo"  # type: ignore

    agent_2 = Agent[None](
        name="test",
        model=model,
        handoffs=[
            Handoff(
                tool_name=Handoff.default_tool_name(agent_1),
                tool_description=Handoff.default_tool_description(agent_1),
                input_json_schema={},
                on_invoke_handoff=on_invoke_handoff,
                agent_name=agent_1.name,
                input_filter=invalid_input_filter,
            )
        ],
    )

    model.add_multiple_turn_outputs(
        [
            [get_text_message("1"), get_text_message("2"), get_handoff_tool_call(agent_1)],
            [get_text_message("last")],
        ]
    )

    with pytest.raises(UserError):
        result = Runner.run_streamed(agent_2, input="user_message")
        async for _ in result.stream_events():
            pass


@pytest.mark.asyncio
async def test_non_callable_input_filter_causes_error():
    model = FakeModel()
    agent_1 = Agent(
        name="test",
        model=model,
    )

    async def on_invoke_handoff(_ctx: RunContextWrapper[Any], _input: str) -> Agent[Any]:
        return agent_1

    agent_2 = Agent[None](
        name="test",
        model=model,
        handoffs=[
            Handoff(
                tool_name=Handoff.default_tool_name(agent_1),
                tool_description=Handoff.default_tool_description(agent_1),
                input_json_schema={},
                on_invoke_handoff=on_invoke_handoff,
                agent_name=agent_1.name,
                # Purposely ignoring the type error here to simulate invalid input
                input_filter="foo",  # type: ignore
            )
        ],
    )

    model.add_multiple_turn_outputs(
        [
            [get_text_message("1"), get_text_message("2"), get_handoff_tool_call(agent_1)],
            [get_text_message("last")],
        ]
    )

    with pytest.raises(UserError):
        result = Runner.run_streamed(agent_2, input="user_message")
        async for _ in result.stream_events():
            pass


@pytest.mark.asyncio
async def test_handoff_on_input():
    call_output: str | None = None

    def on_input(_ctx: RunContextWrapper[Any], data: Foo) -> None:
        nonlocal call_output
        call_output = data["bar"]

    model = FakeModel()
    agent_1 = Agent(
        name="test",
        model=model,
    )

    agent_2 = Agent(
        name="test",
        model=model,
        handoffs=[
            handoff(
                agent=agent_1,
                on_handoff=on_input,
                input_type=Foo,
            )
        ],
    )

    model.add_multiple_turn_outputs(
        [
            [
                get_text_message("1"),
                get_text_message("2"),
                get_handoff_tool_call(agent_1, args=json.dumps(Foo(bar="test_input"))),
            ],
            [get_text_message("last")],
        ]
    )

    result = Runner.run_streamed(agent_2, input="user_message")
    async for _ in result.stream_events():
        pass

    assert result.final_output == "last"

    assert call_output == "test_input", "should have called the handoff with the correct input"


@pytest.mark.asyncio
async def test_async_handoff_on_input():
    call_output: str | None = None

    async def on_input(_ctx: RunContextWrapper[Any], data: Foo) -> None:
        nonlocal call_output
        call_output = data["bar"]

    model = FakeModel()
    agent_1 = Agent(
        name="test",
        model=model,
    )

    agent_2 = Agent(
        name="test",
        model=model,
        handoffs=[
            handoff(
                agent=agent_1,
                on_handoff=on_input,
                input_type=Foo,
            )
        ],
    )

    model.add_multiple_turn_outputs(
        [
            [
                get_text_message("1"),
                get_text_message("2"),
                get_handoff_tool_call(agent_1, args=json.dumps(Foo(bar="test_input"))),
            ],
            [get_text_message("last")],
        ]
    )

    result = Runner.run_streamed(agent_2, input="user_message")
    async for _ in result.stream_events():
        pass

    assert result.final_output == "last"

    assert call_output == "test_input", "should have called the handoff with the correct input"


@pytest.mark.asyncio
async def test_input_guardrail_tripwire_triggered_causes_exception_streamed():
    def guardrail_function(
        context: RunContextWrapper[Any], agent: Agent[Any], input: Any
    ) -> GuardrailFunctionOutput:
        return GuardrailFunctionOutput(
            output_info=None,
            tripwire_triggered=True,
        )

    agent = Agent(
        name="test",
        input_guardrails=[InputGuardrail(guardrail_function=guardrail_function)],
        model=FakeModel(),
    )

    with pytest.raises(InputGuardrailTripwireTriggered):
        result = Runner.run_streamed(agent, input="user_message")
        async for _ in result.stream_events():
            pass


@pytest.mark.asyncio
async def test_output_guardrail_tripwire_triggered_causes_exception_streamed():
    def guardrail_function(
        context: RunContextWrapper[Any], agent: Agent[Any], agent_output: Any
    ) -> GuardrailFunctionOutput:
        return GuardrailFunctionOutput(
            output_info=None,
            tripwire_triggered=True,
        )

    model = FakeModel(initial_output=[get_text_message("first_test")])

    agent = Agent(
        name="test",
        output_guardrails=[OutputGuardrail(guardrail_function=guardrail_function)],
        model=model,
    )

    with pytest.raises(OutputGuardrailTripwireTriggered):
        result = Runner.run_streamed(agent, input="user_message")
        async for _ in result.stream_events():
            pass


@pytest.mark.asyncio
async def test_run_input_guardrail_tripwire_triggered_causes_exception_streamed():
    def guardrail_function(
        context: RunContextWrapper[Any], agent: Agent[Any], input: Any
    ) -> GuardrailFunctionOutput:
        return GuardrailFunctionOutput(
            output_info=None,
            tripwire_triggered=True,
        )

    agent = Agent(
        name="test",
        model=FakeModel(),
    )

    with pytest.raises(InputGuardrailTripwireTriggered):
        result = Runner.run_streamed(
            agent,
            input="user_message",
            run_config=RunConfig(
                input_guardrails=[InputGuardrail(guardrail_function=guardrail_function)]
            ),
        )
        async for _ in result.stream_events():
            pass


@pytest.mark.asyncio
async def test_run_output_guardrail_tripwire_triggered_causes_exception_streamed():
    def guardrail_function(
        context: RunContextWrapper[Any], agent: Agent[Any], agent_output: Any
    ) -> GuardrailFunctionOutput:
        return GuardrailFunctionOutput(
            output_info=None,
            tripwire_triggered=True,
        )

    model = FakeModel(initial_output=[get_text_message("first_test")])

    agent = Agent(
        name="test",
        model=model,
    )

    with pytest.raises(OutputGuardrailTripwireTriggered):
        result = Runner.run_streamed(
            agent,
            input="user_message",
            run_config=RunConfig(
                output_guardrails=[OutputGuardrail(guardrail_function=guardrail_function)]
            ),
        )
        async for _ in result.stream_events():
            pass


@pytest.mark.asyncio
async def test_streaming_events():
    model = FakeModel()
    agent_1 = Agent(
        name="test",
        model=model,
        tools=[get_function_tool("bar", "bar_result")],
        output_type=Foo,
    )

    agent_2 = Agent(
        name="test",
        model=model,
        tools=[get_function_tool("foo", "foo_result")],
        handoffs=[agent_1],
    )

    model.add_multiple_turn_outputs(
        [
            # First turn: a tool call
            [get_function_tool_call("foo", json.dumps({"bar": "baz"}))],
            # Second turn: a message and a handoff
            [get_text_message("a_message"), get_handoff_tool_call(agent_1)],
            # Third turn: tool call and structured output
            [
                get_function_tool_call("bar", json.dumps({"bar": "baz"})),
                get_final_output_message(json.dumps(Foo(bar="baz"))),
            ],
        ]
    )

    # event_type: (count, event)
    event_counts: dict[str, int] = {}
    item_data: list[RunItem] = []
    agent_data: list[AgentUpdatedStreamEvent] = []

    result = Runner.run_streamed(
        agent_2,
        input=[
            get_text_input_item("user_message"),
            get_text_input_item("another_message"),
        ],
    )
    async for event in result.stream_events():
        event_counts[event.type] = event_counts.get(event.type, 0) + 1
        if event.type == "run_item_stream_event":
            item_data.append(event.item)
        elif event.type == "agent_updated_stream_event":
            agent_data.append(event)

    assert result.final_output == Foo(bar="baz")
    assert len(result.raw_responses) == 3, "should have three model responses"
    assert len(result.to_input_list()) == 10, (
        "should have input: 2 orig inputs, function call, function call result, message, handoff, "
        "handoff output, tool call, tool call result, final output"
    )

    assert result.last_agent == agent_1, "should have handed off to agent_1"
    assert result.final_output == Foo(bar="baz"), "should have structured output"

    # Now lets check the events

    expected_item_type_map = {
        "tool_call": 2,
        "tool_call_output": 2,
        "message": 2,
        "handoff": 1,
        "handoff_output": 1,
    }

    total_expected_item_count = sum(expected_item_type_map.values())

    assert event_counts["run_item_stream_event"] == total_expected_item_count, (
        f"Expected {total_expected_item_count} events, got {event_counts['run_item_stream_event']}"
        f"Expected events were: {expected_item_type_map}, got {event_counts}"
    )

    assert (
        len(item_data) == total_expected_item_count
    ), f"should have {total_expected_item_count} run items"
    assert len(agent_data) == 2, "should have 2 agent updated events"
    assert agent_data[0].new_agent == agent_2, "should have started with agent_2"
    assert agent_data[1].new_agent == agent_1, "should have handed off to agent_1"