from datetime import timedelta
from pathlib import Path
from unittest.mock import patch

import pytest
from django.core.management import call_command
from django.utils import timezone

from finance.models import Dataset, FormulaExport

pytestmark = pytest.mark.django_db


def test_worker_processes_queued_import_and_reports_export_failure(workspace):
    ds, *_ = workspace
    ds.status = "queued"
    ds.save(update_fields=["status"])
    with patch(
        "finance.management.commands.import_worker.process_dataset", return_value=ds
    ) as process_import:
        call_command("import_worker", once=True)
    process_import.assert_called_once_with(ds.pk)
    # PostgreSQL 上 worker 持咨询锁会立即重认领 processing 任务：模拟导入完成，
    # 否则第二次 --once 又被它抢占，轮不到下面的导出任务（SQLite 无咨询锁，
    # 不走立即恢复路径，两种后端行为一致）。
    Dataset.objects.filter(pk=ds.pk).update(status="ready")

    export = FormulaExport.objects.create(dataset=ds, user=ds.created_by, context={})
    with patch(
        "finance.management.commands.import_worker.process_formula_export",
        side_effect=ValueError("invalid export"),
    ):
        call_command("import_worker", once=True)
    export.refresh_from_db()
    assert export.status == "processing"


def _export_job(ds, **kwargs):
    return FormulaExport.objects.create(
        dataset=ds,
        user=ds.created_by,
        context={"start": "2026-08", "end": "2026-08", "comparison": "yoy", "group": "department"},
        **kwargs,
    )


def test_worker_refuses_export_after_role_revocation(workspace):
    from finance.exporting import process_formula_export

    ds, member, *_ = workspace
    job = _export_job(ds, status="processing")
    member.role = "viewer"
    member.save(update_fields=["role"])

    with pytest.raises(PermissionError, match="角色"):
        process_formula_export(job.pk)

    job.refresh_from_db()
    assert job.status == "failed"
    assert not job.path
    assert not list(Path(ds.file.storage.location).rglob(f"{job.pk}*"))


def test_worker_refuses_export_after_account_deactivation(workspace):
    from finance.exporting import process_formula_export

    ds, _, _, _, _ = workspace
    user = ds.created_by
    user.is_active = False
    user.save(update_fields=["is_active"])
    job = _export_job(ds, status="processing")

    with pytest.raises(PermissionError, match="停用"):
        process_formula_export(job.pk)

    job.refresh_from_db()
    assert job.status == "failed"


def test_status_and_download_deny_revoked_viewer(workspace, settings):
    ds, member, client, *_ = workspace
    job = _export_job(
        ds,
        status="succeeded",
        finished_at=timezone.now(),
        expires_at=timezone.now() + timedelta(hours=1),
    )
    target = Path(settings.MEDIA_ROOT) / "formula-exports" / str(job.user_id) / f"{job.pk}.xlsx"
    target.parent.mkdir(parents=True)
    target.write_bytes(b"PK workbook")
    job.path = str(target)
    job.save(update_fields=["path"])

    assert client.get(f"/api/datasets/{ds.pk}/formula-exports/{job.pk}").status_code == 200
    assert (
        client.get(f"/api/datasets/{ds.pk}/formula-exports/{job.pk}/download").status_code == 200
    )

    member.role = "viewer"
    member.save(update_fields=["role"])
    assert client.get(f"/api/datasets/{ds.pk}/formula-exports/{job.pk}").status_code == 403
    assert (
        client.get(f"/api/datasets/{ds.pk}/formula-exports/{job.pk}/download").status_code == 403
    )


def test_half_finished_export_cannot_be_downloaded(workspace, settings):
    ds, _, client, *_ = workspace
    for status, code in (("processing", 409), ("failed", 409), ("queued", 409)):
        job = _export_job(ds, status=status)
        assert (
            client.get(f"/api/datasets/{ds.pk}/formula-exports/{job.pk}/download").status_code
            == code
        ), status
    succeeded = _export_job(
        ds,
        status="succeeded",
        path=str(Path(settings.MEDIA_ROOT) / "nowhere.xlsx"),
        finished_at=timezone.now(),
        expires_at=timezone.now() + timedelta(hours=1),
    )
    assert (
        client.get(f"/api/datasets/{ds.pk}/formula-exports/{succeeded.pk}/download").status_code
        == 410
    )


def test_stale_processing_export_is_reclaimed_after_timeout(workspace):
    ds, *_ = workspace
    job = _export_job(ds, status="processing")
    FormulaExport.objects.filter(pk=job.pk).update(
        created_at=timezone.now() - timedelta(minutes=20)
    )

    call_command("import_worker", once=True)

    job.refresh_from_db()
    assert job.status == "succeeded"
    assert Path(job.path).read_bytes()[:2] == b"PK"
    assert not list(Path(job.path).parent.glob(f"{job.pk}.*.tmp"))


def test_recent_processing_export_is_not_reclaimed(workspace):
    ds, *_ = workspace
    job = _export_job(ds, status="processing")

    call_command("import_worker", once=True)

    job.refresh_from_db()
    assert job.status == "processing"