"""Integration tests for crash recovery sweep (sweep_orphan_runs)."""

from __future__ import annotations

import uuid
from collections.abc import AsyncGenerator
from pathlib import Path

import pytest
import pytest_asyncio
from sqlalchemy import select
from sqlalchemy.exc import IntegrityError

from my_deepagent.enums import RunPhaseState, RunState
from my_deepagent.persistence.db import Database
from my_deepagent.persistence.models import (
    RunEventRow,
    RunPhaseRow,
    RunRow,
    WorkflowTemplateRow,
)
from my_deepagent.recovery import SweepReport, sweep_orphan_runs
from my_deepagent.run_event import RunEventType

# ---------------------------------------------------------------------------
# Helpers
# ---------------------------------------------------------------------------

_NOW = "2026-05-14T00:00:00+00:00"


def _make_id() -> str:
    return str(uuid.uuid4())


def _template_row(template_id: str | None = None) -> WorkflowTemplateRow:
    tid = template_id or _make_id()
    return WorkflowTemplateRow(
        id=tid,
        name="test-wf",
        version=1,
        hash=tid,
        definition={},
        created_at=_NOW,
    )


def _run_row(
    *,
    run_id: str | None = None,
    template_id: str,
    state: str = RunState.EXECUTING.value,
    repo_path: str = "/repo",
    base_branch: str = "main",
) -> RunRow:
    rid = run_id or _make_id()
    return RunRow(
        id=rid,
        template_id=template_id,
        template_hash="a" * 64,
        state=state,
        repo_path=repo_path,
        base_branch=base_branch,
        worktree_root="/wt",
        created_at=_NOW,
        updated_at=_NOW,
    )


def _phase_row(run_id: str, state: str = RunPhaseState.RUNNING.value) -> RunPhaseRow:
    return RunPhaseRow(
        id=_make_id(),
        run_id=run_id,
        phase_key="spec",
        seq=0,
        state=state,
        attempts=1,
        started_at=_NOW,
    )


# ---------------------------------------------------------------------------
# Fixtures
# ---------------------------------------------------------------------------


@pytest_asyncio.fixture()
async def db(tmp_path: Path) -> AsyncGenerator[Database, None]:
    url = f"sqlite+aiosqlite:///{tmp_path}/test.db"
    database = Database(url)
    await database.init_schema()
    yield database
    await database.dispose()


# ---------------------------------------------------------------------------
# Tests
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_sweep_with_no_orphans_returns_empty_report(db: Database) -> None:
    """Sweep on empty DB returns SweepReport with zero counts."""
    report = await sweep_orphan_runs(db)
    assert isinstance(report, SweepReport)
    assert report.total == 0
    assert report.failed_runs == ()
    assert report.failed_phases == ()


@pytest.mark.asyncio
async def test_sweep_marks_executing_run_as_failed(db: Database) -> None:
    """A run in EXECUTING state is marked FAILED after sweep."""
    tid = _make_id()
    run = _run_row(template_id=tid, state=RunState.EXECUTING.value)
    async with db.session() as s:
        s.add(_template_row(tid))
    async with db.session() as s:
        s.add(run)

    report = await sweep_orphan_runs(db)
    assert len(report.failed_runs) == 1

    async with db.session() as s:
        refreshed = await s.get(RunRow, run.id)
    assert refreshed is not None
    assert refreshed.state == RunState.FAILED.value
    assert refreshed.ended_at is not None


@pytest.mark.asyncio
async def test_sweep_marks_paused_run_as_failed(db: Database) -> None:
    """A run in PAUSED state is marked FAILED after sweep."""
    tid = _make_id()
    run = _run_row(template_id=tid, state=RunState.PAUSED.value)
    async with db.session() as s:
        s.add(_template_row(tid))
    async with db.session() as s:
        s.add(run)

    report = await sweep_orphan_runs(db)
    assert len(report.failed_runs) == 1

    async with db.session() as s:
        refreshed = await s.get(RunRow, run.id)
    assert refreshed is not None
    assert refreshed.state == RunState.FAILED.value


@pytest.mark.asyncio
async def test_sweep_leaves_completed_run_alone(db: Database) -> None:
    """A run in COMPLETED state is NOT touched by the sweep."""
    tid = _make_id()
    run = _run_row(template_id=tid, state=RunState.COMPLETED.value)
    async with db.session() as s:
        s.add(_template_row(tid))
    async with db.session() as s:
        s.add(run)

    report = await sweep_orphan_runs(db)
    assert report.total == 0

    async with db.session() as s:
        refreshed = await s.get(RunRow, run.id)
    assert refreshed is not None
    assert refreshed.state == RunState.COMPLETED.value


@pytest.mark.asyncio
async def test_sweep_cascades_phase_states(db: Database) -> None:
    """Orphan phases belonging to a swept run are also marked FAILED."""
    tid = _make_id()
    run = _run_row(template_id=tid, state=RunState.EXECUTING.value)
    async with db.session() as s:
        s.add(_template_row(tid))
    async with db.session() as s:
        s.add(run)
    phase = _phase_row(run.id, state=RunPhaseState.RUNNING.value)
    async with db.session() as s:
        s.add(phase)

    report = await sweep_orphan_runs(db)
    assert len(report.failed_runs) == 1
    assert len(report.failed_phases) == 1

    async with db.session() as s:
        refreshed_phase = await s.get(RunPhaseRow, phase.id)
    assert refreshed_phase is not None
    assert refreshed_phase.state == RunPhaseState.FAILED.value
    assert refreshed_phase.ended_at is not None


@pytest.mark.asyncio
async def test_sweep_emits_run_failed_event(db: Database) -> None:
    """Sweep emits exactly one run.failed event per orphan run."""
    tid = _make_id()
    run = _run_row(template_id=tid, state=RunState.EXECUTING.value)
    async with db.session() as s:
        s.add(_template_row(tid))
    async with db.session() as s:
        s.add(run)

    await sweep_orphan_runs(db)

    async with db.session() as s:
        events = (
            (
                await s.execute(
                    select(RunEventRow)
                    .where(RunEventRow.run_id == run.id)
                    .where(RunEventRow.type == RunEventType.RUN_FAILED.value)
                )
            )
            .scalars()
            .all()
        )
    assert len(events) == 1
    assert events[0].payload.get("reason") == "process_restart_unrecovered"


@pytest.mark.asyncio
async def test_sweep_idempotent_no_duplicate_event(db: Database) -> None:
    """Running sweep twice does not create duplicate events (ON CONFLICT DO NOTHING)."""
    tid = _make_id()
    run = _run_row(template_id=tid, state=RunState.EXECUTING.value)
    async with db.session() as s:
        s.add(_template_row(tid))
    async with db.session() as s:
        s.add(run)

    # First sweep marks the run as failed.
    report1 = await sweep_orphan_runs(db)
    assert len(report1.failed_runs) == 1

    # Second sweep: no more non-terminal runs, no duplicate events.
    report2 = await sweep_orphan_runs(db)
    assert report2.total == 0

    async with db.session() as s:
        events = (
            (
                await s.execute(
                    select(RunEventRow)
                    .where(RunEventRow.run_id == run.id)
                    .where(RunEventRow.type == RunEventType.RUN_FAILED.value)
                )
            )
            .scalars()
            .all()
        )
    assert len(events) == 1


@pytest.mark.asyncio
async def test_sweep_frees_active_run_slot(db: Database) -> None:
    """After sweep, a second run with same (repo_path, base_branch) can be inserted.

    Without sweep: the partial unique index ux_active_run_repo_base prevents a second
    active run for the same (repo_path, base_branch). After sweep marks the first run
    FAILED, the uniqueness slot is freed and the second insert succeeds.
    """
    repo = "/unique-repo"
    branch = "main"
    tid1 = _make_id()
    tid2 = _make_id()
    run1 = _run_row(
        template_id=tid1,
        state=RunState.EXECUTING.value,
        repo_path=repo,
        base_branch=branch,
    )

    async with db.session() as s:
        s.add(_template_row(tid1))
        s.add(_template_row(tid2))
    async with db.session() as s:
        s.add(run1)

    # A second executing run for the same (repo, branch) must raise IntegrityError.
    run2 = _run_row(
        template_id=tid2,
        state=RunState.EXECUTING.value,
        repo_path=repo,
        base_branch=branch,
    )
    with pytest.raises(IntegrityError):
        async with db.session() as s:
            s.add(run2)

    # Sweep frees the slot.
    report = await sweep_orphan_runs(db)
    assert len(report.failed_runs) == 1

    # Now the second insert should succeed.
    run3 = _run_row(
        template_id=tid2,
        state=RunState.EXECUTING.value,
        repo_path=repo,
        base_branch=branch,
    )
    async with db.session() as s:
        s.add(run3)

    async with db.session() as s:
        refreshed = await s.get(RunRow, run3.id)
    assert refreshed is not None
    assert refreshed.state == RunState.EXECUTING.value