from datetime import timedelta

from celery.exceptions import SoftTimeLimitExceeded
from django.utils import timezone

from apps.agents.models import AgentRun
from apps.agents.services import build_config_snapshot, execute_agent_run
from apps.agents.tasks import cleanup_expired_agent_runs
from apps.agents.tasks import execute_agent_run as execute_agent_run_task
from apps.audit.models import OperationAuditLog
from apps.modelhub.services import CompletionResult

from .helpers import create_agent


def create_run(version):
    return AgentRun.objects.create(
        definition=version.definition,
        agent_version=version,
        sandbox=version.status == "draft",
        input_payload={"problem": "无法登录"},
        config_snapshot=build_config_snapshot(version),
        total_steps=version.steps.count(),
    )


def test_ordered_runtime_records_steps_usage_and_final_output(db, monkeypatch):
    _, version = create_agent()
    outputs = iter(
        [
            CompletionResult('{"summary":"账号异常"}', 10, 5),
            CompletionResult('{"reply":"请重置密码"}', 12, 6),
        ]
    )
    monkeypatch.setattr(
        "apps.modelhub.services._request_completion",
        lambda *args, **kwargs: next(outputs),
    )
    run = create_run(version)

    execute_agent_run(run.id)

    run.refresh_from_db()
    assert run.status == "succeeded"
    assert run.final_output == {"reply": "请重置密码"}
    assert run.input_tokens == 22
    assert run.output_tokens == 11
    assert list(run.steps.values_list("code", flat=True)) == ["structure", "reply"]


def test_invalid_structure_is_repaired_once(db, monkeypatch):
    _, version = create_agent(two_steps=False)
    outputs = iter(
        [
            CompletionResult("not-json", 4, 2),
            CompletionResult('{"summary":"已修复"}', 5, 3),
        ]
    )
    monkeypatch.setattr(
        "apps.modelhub.services._request_completion",
        lambda *args, **kwargs: next(outputs),
    )
    run = create_run(version)

    execute_agent_run(run.id)

    run.refresh_from_db()
    step = run.steps.get()
    assert run.status == "succeeded"
    assert step.attempts.count() == 2
    assert list(step.attempts.values_list("attempt_type", flat=True)) == [
        "initial",
        "structure_repair",
    ]


def test_second_invalid_structure_fails_and_stops(db, monkeypatch):
    _, version = create_agent()
    outputs = iter(
        [
            CompletionResult("not-json", 4, 2),
            CompletionResult("still-not-json", 5, 3),
        ]
    )
    monkeypatch.setattr(
        "apps.modelhub.services._request_completion",
        lambda *args, **kwargs: next(outputs),
    )
    run = create_run(version)

    execute_agent_run(run.id)

    run.refresh_from_db()
    assert run.status == "failed"
    assert run.steps.count() == 1
    assert run.steps.get().status == "failed"


def test_cancellation_before_first_step_stops_run(db):
    _, version = create_agent()
    run = create_run(version)
    run.cancellation_requested_at = timezone.now()
    run.save(update_fields=["cancellation_requested_at"])

    execute_agent_run(run.id)

    run.refresh_from_db()
    assert run.status == "cancelled"
    assert run.steps.count() == 0


def test_cancellation_after_model_response_stops_following_steps(db, monkeypatch):
    _, version = create_agent()
    run = create_run(version)

    def request(*args, **kwargs):
        AgentRun.objects.filter(id=run.id).update(cancellation_requested_at=timezone.now())
        return CompletionResult('{"summary":"已完成当前请求"}', 3, 2)

    monkeypatch.setattr("apps.modelhub.services._request_completion", request)

    execute_agent_run(run.id)

    run.refresh_from_db()
    assert run.status == "cancelled"
    assert list(run.steps.values_list("code", flat=True)) == ["structure"]
    assert run.steps.get().status == "succeeded"
    assert run.final_output is None


def test_multimodal_request_keeps_base64_out_of_database_snapshots(db, monkeypatch):
    _, version = create_agent(two_steps=False)
    captured = {}

    def request(deployment, messages, **kwargs):
        captured["messages"] = messages
        return CompletionResult('{"summary":"识别到截图"}', 8, 3)

    monkeypatch.setattr("apps.modelhub.services._request_completion", request)
    run = create_run(version)
    run.input_payload["image_refs"] = [
        {"object_path": "ticket-drafts/proof.png", "mime_type": "image/png"}
    ]
    run.save(update_fields=["input_payload"])

    execute_agent_run(
        run.id,
        image_parts=[
            {
                "type": "image_url",
                "image_url": {"url": "data:image/png;base64,c2Vuc2l0aXZl"},
            }
        ],
    )

    invocation = run.steps.get().attempts.get(attempt_type="initial").model_invocation
    assert "base64" in str(captured["messages"])
    assert "base64" not in str(invocation.input_snapshot)
    assert invocation.input_snapshot["image_refs"][0]["object_path"].endswith("proof.png")


def test_soft_time_limit_marks_run_timed_out_and_audits(db, monkeypatch):
    _, version = create_agent()
    run = create_run(version)
    monkeypatch.setattr(
        "apps.agents.tasks.execute_agent_run_service",
        lambda *_: (_ for _ in ()).throw(SoftTimeLimitExceeded()),
    )

    execute_agent_run_task.run(run.id)

    run.refresh_from_db()
    assert run.status == "timed_out"
    assert run.error_code == "run_timeout"
    assert OperationAuditLog.objects.filter(
        target_id=str(run.public_id),
        action="run_finished",
        result="timed_out",
    ).exists()


def test_cleanup_removes_expired_runs_but_keeps_audit(db, settings):
    _, version = create_agent()
    run = create_run(version)
    AgentRun.objects.filter(id=run.id).update(created_at=timezone.now() - timedelta(days=91))

    deleted = cleanup_expired_agent_runs()

    assert deleted == 1
    assert not AgentRun.objects.filter(id=run.id).exists()
    assert OperationAuditLog.objects.filter(
        module="agents",
        action="cleanup_runs",
        request_snapshot__deleted_count=1,
    ).exists()