from types import SimpleNamespace

import pytest

from app.application.agent import (
    compose_system_messages,
    next_step_for_tool,
    step_event_payload,
    task_from_deliberative_plan,
    task_plan_payload,
)
from app.application.agent.skill_loader import load_skill_manifests
from app.modules.agent import (
    AgentDefinition,
    AgentTask,
    ExecutionPolicy,
    Plan,
    PlanStep,
    ToolPolicy,
)
from app.modules.planner import DeliberativePlan
from app.modules.planner import PlanStep as DeliberativePlanStep
from app.modules.skills import parse_skill_manifest


def test_agent_definition_keeps_minimal_execution_and_tool_policy() -> None:
    agent = AgentDefinition(
        name="工师",
        system_prompt="完成已授权的工程任务。",
        skill_refs=("代码审查",),
        tool_policy=ToolPolicy(("read_file", "shell")),
        execution_policy=ExecutionPolicy(max_iterations=3),
    )

    assert agent.skill_refs == ("代码审查",)
    assert agent.tool_policy.allowed_tools == ("read_file", "shell")
    assert agent.execution_policy.max_iterations == 3


def test_agent_task_keeps_plan_as_runtime_only_contract() -> None:
    task = AgentTask(
        id="task_1",
        objective="审查当前变更",
        agent_name="工师",
        plan=Plan(
            steps=(PlanStep(id="step_1", title="读取变更", tool="read_file"),),
            status="approved",
        ),
    )

    assert task.status == "queued"
    assert task.plan is not None
    assert task.plan.steps[0].status == "pending"


def test_deliberative_plan_becomes_traceable_agent_task() -> None:
    task = task_from_deliberative_plan(
        DeliberativePlan(
            title="调研计划",
            steps=[
                DeliberativePlanStep(
                    id=1,
                    title="检索资料",
                    description="读取相关资料",
                    tool="fetch_url",
                    risk_level="L2",
                )
            ],
            assumptions=["资料可访问"],
            risks=["来源不完整"],
        ),
        run_id="run_1",
        agent_name="学士",
        objective="调研主题",
    )

    assert task.status == "running"
    assert task.plan is not None
    assert task.plan.steps[0].id == "1"
    assert task_plan_payload(task)["steps"] == [
        {
            "id": "1",
            "title": "检索资料",
            "description": "读取相关资料",
            "tool": "fetch_url",
            "risk_level": "L2",
            "status": "pending",
        }
    ]


def test_tool_maps_only_to_its_next_uncompleted_plan_step() -> None:
    task = AgentTask(
        id="task_1",
        objective="执行计划",
        agent_name="工师",
        plan=Plan(
            steps=(
                PlanStep(id="1", title="读取", tool="read_file"),
                PlanStep(id="2", title="再次读取", tool="read_file"),
            )
        ),
    )

    first = next_step_for_tool(task, "read_file", set())
    second = next_step_for_tool(task, "read_file", {"1"})

    assert first is not None and first.id == "1"
    assert second is not None and second.id == "2"
    assert next_step_for_tool(task, "shell", set()) is None
    assert step_event_payload(task, first, status="completed", result_summary="读取成功") == {
        "task_id": "task_1",
        "step_id": "1",
        "title": "读取",
        "tool": "read_file",
        "risk_level": "L2",
        "status": "completed",
        "result_summary": "读取成功",
    }


def test_execution_policy_rejects_invalid_iteration_limit() -> None:
    with pytest.raises(ValueError, match="max_iterations"):
        ExecutionPolicy(max_iterations=0)


def test_manifest_and_prompt_composer_keep_stable_order() -> None:
    skill = SimpleNamespace(
        name="代码审查",
        description="审查变更",
        trigger="审查, review",
        prompt_fragment="先理解调用路径，再报告问题。",
        risk_level="L1",
        status="enabled",
        tool_bindings_json='["read_file"]',
    )
    manifest = parse_skill_manifest(skill, ["read_file"])

    messages = compose_system_messages(
        ["全局约束"],
        AgentDefinition(name="工师", system_prompt="只执行已授权任务。"),
        [manifest],
    )

    assert manifest.triggers == ("审查", "review")
    assert messages == [
        "全局约束",
        "【Agent：工师】\n只执行已授权任务。",
        "【代码审查·能力注入】\n先理解调用路径，再报告问题。",
    ]


def test_default_tools_filters_explicit_allowlist() -> None:
    from app.application.agent.tools import default_tools

    tools = default_tools(allowed_tools=("read_file",))

    assert [tool["function"]["name"] for tool in tools] == ["read_file"]


async def test_skill_loader_unions_matches_with_explicit_references(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    skills = [
        SimpleNamespace(
            name="代码审查",
            description="审查",
            trigger="审查",
            prompt_fragment="审查流程",
            risk_level="L1",
            status="enabled",
            tool_bindings_json='["read_file"]',
        ),
        SimpleNamespace(
            name="网页研究",
            description="研究",
            trigger="研究",
            prompt_fragment="研究流程",
            risk_level="L2",
            status="enabled",
            tool_bindings_json='["web_search"]',
        ),
    ]

    async def fake_match_active_skills(_context: str):
        return [skills[0]]

    async def fake_get_enabled_skills_by_names(names: tuple[str, ...]):
        return [skill for skill in skills if skill.name in names]

    monkeypatch.setattr(
        "app.application.agent.skill_loader.match_active_skills",
        fake_match_active_skills,
    )
    monkeypatch.setattr(
        "app.application.agent.skill_loader.get_enabled_skills_by_names",
        fake_get_enabled_skills_by_names,
    )

    manifests = await load_skill_manifests("请审查", skill_refs=("网页研究",))

    assert [manifest.name for manifest in manifests] == ["代码审查", "网页研究"]
    assert manifests[0].allowed_tools == ("read_file",)