"""Characterization tests locking the intelligent-eval state machine.

Locks the ``_TRANSITIONS`` table through the public lifecycle API before the
module is split into phase sub-modules, so the split cannot silently change
which transitions are allowed:

  draft → planning → pending_approval → executing → completed
                                                  → cancelled
                                                  → failed
  pending_approval → planning (reject, with feedback)
  pending_approval / executing → cancelled
  completed / cancelled / failed → deleted
"""

import json

import pytest
from agenteval.intelligent_eval import lifecycle
from agenteval.intelligent_eval.models import IntelligentEvalSessionStatus, IntelligentEvalStatus
from agenteval.models import ChannelType, EvalTarget, PlatformType, TargetStatus
from agenteval.storage.db import IntelligentEvalSessionDB, utc_now
from agenteval.storage.repository import TargetRepository
from sqlmodel import Session


def _seed_target(session: Session, target_id: str = "t-1") -> None:
    TargetRepository(session).create(
        EvalTarget(
            id=target_id,
            name="ie-target",
            platform=PlatformType.AI_DIGITAL_EMPLOYEE,
            channel_type=ChannelType.TUTU_API,
            channel_config={
                "base_url": "http://mock", "token": "x",
                "tenant": "t", "chat_channel_id": "c", "chat_contact_id": "u",
            },
            status=TargetStatus.ACTIVE,
        )
    )


def _create(session: Session) -> str:
    ev = lifecycle.create_eval(
        session,
        name="char-eval",
        target_id="t-1",
        goal="评估服务质量",
        seeds={},
        intent="关注售后",
        role_description="客服数字员工",
    )
    return ev.id


def _to_pending(session: Session) -> str:
    eval_id = _create(session)
    lifecycle.submit_plan(session, eval_id, {"estimated_sessions": 2})
    return eval_id


def _to_executing(session: Session) -> str:
    eval_id = _to_pending(session)
    lifecycle.approve(session, eval_id)
    return eval_id


@pytest.fixture()
def seeded(db_session):
    _seed_target(db_session)
    return db_session


def test_create_enters_planning(seeded):
    ev = lifecycle.get_eval(seeded, _create(seeded))
    assert ev.status is IntelligentEvalStatus.PLANNING


def test_happy_path_to_completed(seeded):
    eval_id = _to_executing(seeded)
    ev = lifecycle.submit_report(seeded, eval_id, {"summary": "整体良好"})
    assert ev.status is IntelligentEvalStatus.COMPLETED


def test_submit_plan_moves_to_pending_approval(seeded):
    ev = lifecycle.submit_plan(seeded, _create(seeded), {"estimated_sessions": 1})
    assert ev.status is IntelligentEvalStatus.PENDING_APPROVAL


def test_reject_returns_to_planning_with_feedback(seeded):
    eval_id = _to_pending(seeded)
    ev = lifecycle.reject(seeded, eval_id, "计划太粗，补充时段分布")
    assert ev.status is IntelligentEvalStatus.PLANNING
    assert ev.plan_feedback == "计划太粗，补充时段分布"


def test_cancel_from_pending_approval(seeded):
    eval_id = _to_pending(seeded)
    assert lifecycle.cancel(seeded, eval_id).status is IntelligentEvalStatus.CANCELLED


def test_cancel_from_executing(seeded):
    eval_id = _to_executing(seeded)
    assert lifecycle.cancel(seeded, eval_id).status is IntelligentEvalStatus.CANCELLED


@pytest.mark.parametrize(
    "make_state,action",
    [
        (_create, lambda s, i: lifecycle.approve(s, i)),            # planning → executing 非法
        (_to_executing, lambda s, i: lifecycle.submit_plan(s, i, {})),  # executing → planning 非法
        (_to_pending, lambda s, i: lifecycle.submit_report(s, i, {})),  # pending → completed 非法
    ],
    ids=["approve-during-planning", "submit-plan-during-executing", "report-during-pending"],
)
def test_illegal_transitions_raise(seeded, make_state, action):
    eval_id = make_state(seeded)
    with pytest.raises(lifecycle.IntelligentEvalTransitionError):
        action(seeded, eval_id)


def test_cancel_rejected_in_planning_and_completed(seeded):
    planning_id = _create(seeded)
    with pytest.raises(lifecycle.IntelligentEvalTransitionError):
        lifecycle.cancel(seeded, planning_id)

    completed_id = _to_executing(seeded)
    lifecycle.submit_report(seeded, completed_id, {})
    with pytest.raises(lifecycle.IntelligentEvalTransitionError):
        lifecycle.cancel(seeded, completed_id)


def test_delete_from_each_terminal_state(seeded):
    # completed
    completed_id = _to_executing(seeded)
    lifecycle.submit_report(seeded, completed_id, {})
    assert lifecycle.delete_eval(seeded, completed_id).status is IntelligentEvalStatus.DELETED
    # cancelled
    cancelled_id = _to_pending(seeded)
    lifecycle.cancel(seeded, cancelled_id)
    assert lifecycle.delete_eval(seeded, cancelled_id).status is IntelligentEvalStatus.DELETED


def test_delete_rejected_while_executing(seeded):
    eval_id = _to_executing(seeded)
    with pytest.raises(lifecycle.IntelligentEvalTransitionError):
        lifecycle.delete_eval(seeded, eval_id)


def test_delete_is_idempotent(seeded):
    completed_id = _to_executing(seeded)
    lifecycle.submit_report(seeded, completed_id, {})
    lifecycle.delete_eval(seeded, completed_id)
    assert lifecycle.delete_eval(seeded, completed_id).status is IntelligentEvalStatus.DELETED


def test_submit_report_blocked_by_running_session(seeded):
    eval_id = _to_executing(seeded)
    seeded.add(
        IntelligentEvalSessionDB(
            eval_id=eval_id,
            target_id="t-1",
            persona=json.dumps({"name": "老客户"}),
            goal="退货",
            status=IntelligentEvalSessionStatus.RUNNING.value,
            created_at=utc_now(),
        )
    )
    seeded.commit()
    with pytest.raises(lifecycle.IntelligentEvalTransitionError, match="进行中的会话"):
        lifecycle.submit_report(seeded, eval_id, {"summary": "x"})


def test_missing_eval_raises_not_found(seeded):
    with pytest.raises(lifecycle.IntelligentEvalNotFoundError):
        lifecycle.approve(seeded, "no-such-eval")