"""Integration tests for src/my_deepagent/persistence/ (DB engine + ORM models)."""

from __future__ import annotations

import subprocess
import sys
import uuid
from pathlib import Path
from typing import Any

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

from my_deepagent.persistence.db import Database
from my_deepagent.persistence.models import (
    AgentPersonaRow,
    RunEventRow,
    RunInputRow,
    RunPhaseRow,
    RunRow,
    WorkflowTemplateRow,
)

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

_NOW = "2026-05-15T00:00:00+00:00"


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


def _workflow_template_row(template_id: str) -> WorkflowTemplateRow:
    """Return a WorkflowTemplateRow that satisfies the runs.template_id FK."""
    return WorkflowTemplateRow(
        id=template_id,
        name="test-wf",
        version=1,
        hash=template_id,  # unique per invocation
        definition={},
        created_at=_NOW,
    )


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


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


@pytest.fixture()
def db_url(tmp_path: Path) -> str:
    return f"sqlite+aiosqlite:///{tmp_path}/test.db"


@pytest_asyncio.fixture()
async def db(db_url: str) -> Database:  # type: ignore[misc]
    database = Database(db_url)
    await database.init_schema()
    yield database  # type: ignore[misc]
    await database.dispose()


# ---------------------------------------------------------------------------
# A.1: All 18 tables exist after init_schema
# ---------------------------------------------------------------------------

EXPECTED_TABLES = {
    "workflow_templates",
    "agent_personas",
    "runs",
    "run_inputs",
    "run_bindings",
    "run_phases",
    "run_events",
    "approval_requests",
    "approval_decisions",
    "artifacts",
    "interactive_sessions",
    "tool_calls",
    "llm_calls",
    "model_pricing",
    "budget_ledger",
    "persona_consents",
    "phase_feedback",
    "run_commands",
}


@pytest.mark.asyncio
async def test_init_schema_creates_all_tables(db: Database) -> None:
    """All expected tables must exist in sqlite_master after init_schema."""
    async with db.session() as session:
        result = await session.execute(
            text("SELECT name FROM sqlite_master WHERE type='table' ORDER BY name")
        )
        table_names = {row[0] for row in result.fetchall()}
    table_names.discard("alembic_version")
    assert EXPECTED_TABLES <= table_names, f"Missing tables: {EXPECTED_TABLES - table_names}"


# ---------------------------------------------------------------------------
# A.2: WAL mode active
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_wal_mode_active(db: Database) -> None:
    """journal_mode PRAGMA must return 'wal' after connection."""
    async with db.session() as session:
        result = await session.execute(text("PRAGMA journal_mode"))
        mode = result.scalar()
    assert mode == "wal", f"Expected 'wal', got {mode!r}"


# ---------------------------------------------------------------------------
# A.3: busy_timeout active
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_busy_timeout_active(db: Database) -> None:
    """busy_timeout PRAGMA must return 5000."""
    async with db.session() as session:
        result = await session.execute(text("PRAGMA busy_timeout"))
        timeout = result.scalar()
    assert timeout == 5000, f"Expected 5000, got {timeout!r}"


# ---------------------------------------------------------------------------
# A.4: foreign_keys active
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_foreign_keys_active(db: Database) -> None:
    """foreign_keys PRAGMA must return 1."""
    async with db.session() as session:
        result = await session.execute(text("PRAGMA foreign_keys"))
        fk = result.scalar()
    assert fk == 1, f"Expected 1, got {fk!r}"


# ---------------------------------------------------------------------------
# A.5: basic insert + select round-trip
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_run_row_insert_and_select(db: Database) -> None:
    """RunRow insert then SELECT must return the same state."""
    rid = _make_id()
    tid = _make_id()
    template = _workflow_template_row(tid)
    run = _run_row(rid, template_id=tid)
    async with db.session() as session:
        session.add(template)
        await session.flush()
        session.add(run)
    async with db.session() as session:
        fetched = await session.get(RunRow, rid)
    assert fetched is not None
    assert fetched.id == rid
    assert fetched.state == "pending"


@pytest.mark.asyncio
async def test_agent_persona_row_insert_and_select(db: Database) -> None:
    """AgentPersonaRow insert then SELECT must return the same record."""
    persona_id = _make_id()
    persona = AgentPersonaRow(
        id=persona_id,
        name="test-persona",
        version=1,
        hash="b" * 64,
        definition={"model": "test"},
        created_at=_NOW,
    )
    async with db.session() as session:
        session.add(persona)
    async with db.session() as session:
        fetched = await session.get(AgentPersonaRow, persona_id)
    assert fetched is not None
    assert fetched.name == "test-persona"
    assert fetched.version == 1


# ---------------------------------------------------------------------------
# A.6: UNIQUE constraint — workflow_templates.hash duplicate
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_workflow_template_hash_unique_constraint(db: Database) -> None:
    """Inserting two WorkflowTemplateRows with the same hash must raise IntegrityError."""

    def make_template(tid: str) -> WorkflowTemplateRow:
        return WorkflowTemplateRow(
            id=tid,
            name="my-wf",
            version=1,
            hash="c" * 64,  # same hash for both
            definition={},
            created_at=_NOW,
        )

    t1 = make_template(_make_id())
    async with db.session() as session:
        session.add(t1)

    t2 = make_template(_make_id())
    with pytest.raises(IntegrityError):
        async with db.session() as session:
            session.add(t2)


# ---------------------------------------------------------------------------
# A.7: FK CASCADE — RunRow delete cascades to RunInputRow
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_fk_cascade_run_delete_cascades_run_input(db: Database) -> None:
    """Deleting a RunRow must cascade-delete its RunInputRow."""
    rid = _make_id()
    tid = _make_id()
    template = _workflow_template_row(tid)
    run = _run_row(rid, template_id=tid)
    inp = RunInputRow(
        id=_make_id(),
        run_id=rid,
        requirements_md="# Requirements",
        objective={"goal": "test"},
        extra={},
        input_hash="d" * 64,
    )
    # Insert parent and child in the same transaction so FK is satisfied.
    async with db.session() as session:
        session.add(template)
        await session.flush()  # persist template before run references it
        session.add(run)
        await session.flush()  # persist run before inp references it
        session.add(inp)

    async with db.session() as session:
        fetched_run = await session.get(RunRow, rid)
        assert fetched_run is not None
        await session.delete(fetched_run)

    async with db.session() as session:
        result = await session.execute(
            text("SELECT id FROM run_inputs WHERE run_id = :rid"),
            {"rid": rid},
        )
        rows = result.fetchall()
    assert rows == [], f"Expected cascade delete of run_inputs, got {rows}"


# ---------------------------------------------------------------------------
# A.8: JSON column round-trip
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_json_column_round_trip(db: Database) -> None:
    """RunEventRow.payload nested dict must survive DB round-trip intact."""
    rid = _make_id()
    tid = _make_id()
    template = _workflow_template_row(tid)
    run = _run_row(rid, template_id=tid)
    payload: dict[str, Any] = {
        "nested": {"list": [1, 2, 3], "flag": True},
        "msg": "hello",
    }
    event = RunEventRow(
        run_id=rid,
        seq=1,
        type="phase_started",
        payload=payload,
        idempotency_key="idem-1",
        ts=_NOW,
    )
    async with db.session() as session:
        session.add(template)
        await session.flush()  # persist template before run references it
        session.add(run)
        await session.flush()  # persist run before event references it
        session.add(event)
    async with db.session() as session:
        result = await session.execute(
            text("SELECT payload FROM run_events WHERE run_id = :rid"), {"rid": rid}
        )
        raw = result.scalar()
    import json as _json

    restored = _json.loads(raw) if isinstance(raw, str) else raw
    assert restored == payload


# ---------------------------------------------------------------------------
# A.9: UUID string column round-trip
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_uuid_column_round_trip(db: Database) -> None:
    """UUID primary key stored as string must compare equal after retrieval."""
    expected_id = str(uuid.uuid4())
    tid = _make_id()
    template = _workflow_template_row(tid)
    run = RunRow(
        id=expected_id,
        template_id=tid,
        template_hash="e" * 64,
        state="running",
        repo_path="/r",
        base_branch="main",
        worktree_root="/w",
        created_at=_NOW,
        updated_at=_NOW,
    )
    async with db.session() as session:
        session.add(template)
        await session.flush()
        session.add(run)
    async with db.session() as session:
        fetched = await session.get(RunRow, expected_id)
    assert fetched is not None
    assert fetched.id == expected_id


# ---------------------------------------------------------------------------
# A.10: UNIQUE(run_id, seq) on run_events
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_run_events_unique_run_seq(db: Database) -> None:
    """Two RunEventRows with the same (run_id, seq) must raise IntegrityError."""
    rid = _make_id()
    tid = _make_id()
    template = _workflow_template_row(tid)
    run = _run_row(rid, template_id=tid)
    async with db.session() as session:
        session.add(template)
        await session.flush()
        session.add(run)
        await session.flush()
        session.add(
            RunEventRow(
                run_id=rid,
                seq=1,
                type="x",
                payload={},
                idempotency_key="key-a",
                ts=_NOW,
            )
        )

    with pytest.raises(IntegrityError):
        async with db.session() as session:
            session.add(
                RunEventRow(
                    run_id=rid,
                    seq=1,  # same seq → collision on (run_id, seq)
                    type="x",
                    payload={},
                    idempotency_key="key-b",
                    ts=_NOW,
                )
            )


# ---------------------------------------------------------------------------
# A.11: UNIQUE(run_id, idempotency_key) on run_events
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_run_events_unique_idempotency_key(db: Database) -> None:
    """Two RunEventRows with the same (run_id, idempotency_key) must raise IntegrityError."""
    rid = _make_id()
    tid = _make_id()
    template = _workflow_template_row(tid)
    run = _run_row(rid, template_id=tid)
    async with db.session() as session:
        session.add(template)
        await session.flush()
        session.add(run)
        await session.flush()
        session.add(
            RunEventRow(
                run_id=rid,
                seq=1,
                type="x",
                payload={},
                idempotency_key="shared-key",
                ts=_NOW,
            )
        )

    with pytest.raises(IntegrityError):
        async with db.session() as session:
            session.add(
                RunEventRow(
                    run_id=rid,
                    seq=2,  # different seq
                    type="x",
                    payload={},
                    idempotency_key="shared-key",  # same idem key → collision
                    ts=_NOW,
                )
            )


# ---------------------------------------------------------------------------
# A.12: Index existence on run_events
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_run_events_index_exists(db: Database) -> None:
    """The run_events_run_id_ts_idx index must exist in sqlite_master."""
    async with db.session() as session:
        result = await session.execute(
            text(
                "SELECT name FROM sqlite_master "
                "WHERE type='index' AND name='run_events_run_id_ts_idx'"
            )
        )
        names = [row[0] for row in result.fetchall()]
    assert "run_events_run_id_ts_idx" in names


# ---------------------------------------------------------------------------
# A.13: dispose + new session works
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_dispose_and_reconnect(db_url: str) -> None:
    """After dispose(), creating a new Database and querying must succeed."""
    db1 = Database(db_url)
    await db1.init_schema()
    await db1.dispose()

    db2 = Database(db_url)
    async with db2.session() as session:
        result = await session.execute(
            text("SELECT name FROM sqlite_master WHERE type='table' ORDER BY name")
        )
        tables = [row[0] for row in result.fetchall()]
    await db2.dispose()
    assert "runs" in tables


# ---------------------------------------------------------------------------
# A.14: Alembic upgrade head produces valid schema
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_alembic_upgrade_head_produces_valid_schema(tmp_path: Path) -> None:
    """Running alembic upgrade head on a fresh DB must create the expected tables."""
    db_path = tmp_path / "alembic_test.db"
    db_url = f"sqlite:///{db_path}"  # sync URL for alembic env.py

    project_root = Path(__file__).parent.parent.parent

    result = subprocess.run(
        [
            sys.executable,
            "-m",
            "alembic",
            "upgrade",
            "head",
        ],
        cwd=str(project_root),
        env={**__import__("os").environ, "DATABASE_URL": db_url},
        capture_output=True,
        text=True,
    )
    assert result.returncode == 0, (
        f"alembic upgrade head failed:\nSTDOUT:\n{result.stdout}\nSTDERR:\n{result.stderr}"
    )

    import sqlite3

    with sqlite3.connect(str(db_path)) as conn:
        cur = conn.execute("SELECT name FROM sqlite_master WHERE type='table' ORDER BY name")
        tables = {row[0] for row in cur.fetchall()}

    tables.discard("alembic_version")
    assert EXPECTED_TABLES <= tables, f"Missing after alembic upgrade: {EXPECTED_TABLES - tables}"


# ---------------------------------------------------------------------------
# P0-1: partial unique index ux_active_run_repo_base
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_active_run_unique_index_blocks_duplicate(db: Database) -> None:
    """Two active runs with the same (repo_path, base_branch) must raise IntegrityError."""
    tid = _make_id()
    template = _workflow_template_row(tid)
    rid1 = _make_id()
    run1 = _run_row(rid1, template_id=tid)
    run1.state = "running"

    rid2 = _make_id()
    run2 = _run_row(rid2, template_id=tid)
    run2.state = "pending"
    # Same repo_path and base_branch — both active → must violate unique index.

    async with db.session() as session:
        session.add(template)
        await session.flush()
        session.add(run1)

    with pytest.raises(IntegrityError):
        async with db.session() as session:
            session.add(run2)


@pytest.mark.asyncio
async def test_active_run_unique_index_allows_completed(db: Database) -> None:
    """A completed run allows a new active run with the same (repo_path, base_branch)."""
    tid = _make_id()
    template = _workflow_template_row(tid)
    rid1 = _make_id()
    run1 = _run_row(rid1, template_id=tid)
    run1.state = "completed"

    rid2 = _make_id()
    run2 = _run_row(rid2, template_id=tid)
    run2.state = "running"
    # Same repo/branch; run1 is completed (excluded) → run2 must succeed.

    async with db.session() as session:
        session.add(template)
        await session.flush()
        session.add(run1)

    async with db.session() as session:
        session.add(run2)

    async with db.session() as session:
        fetched = await session.get(RunRow, rid2)
    assert fetched is not None
    assert fetched.state == "running"


# ---------------------------------------------------------------------------
# P0-3: FK CASCADE — RunRow delete cascades to all audit children
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_fk_cascade_run_delete_cascades_phase_feedback(db: Database) -> None:
    """Deleting a RunRow cascades to phase_feedback and run_phases rows."""
    from my_deepagent.persistence.models import PhaseFeedbackRow

    tid = _make_id()
    rid = _make_id()
    phase_id = _make_id()
    template = _workflow_template_row(tid)
    run = _run_row(rid, template_id=tid)
    phase = RunPhaseRow(
        id=phase_id,
        run_id=rid,
        phase_key="plan",
        seq=1,
        state="completed",
        attempts=1,
    )
    feedback = PhaseFeedbackRow(
        run_id=rid,
        phase_id=phase_id,
        reaction="thumbs_up",
        created_at=_NOW,
    )

    async with db.session() as session:
        session.add(template)
        await session.flush()
        session.add(run)
        await session.flush()
        session.add(phase)
        await session.flush()
        session.add(feedback)

    async with db.session() as session:
        fetched_run = await session.get(RunRow, rid)
        assert fetched_run is not None
        await session.delete(fetched_run)

    async with db.session() as session:
        fb_result = await session.execute(
            text("SELECT id FROM phase_feedback WHERE run_id = :rid"), {"rid": rid}
        )
        ph_result = await session.execute(
            text("SELECT id FROM run_phases WHERE run_id = :rid"), {"rid": rid}
        )
    assert fb_result.fetchall() == [], "phase_feedback must cascade-delete with run"
    assert ph_result.fetchall() == [], "run_phases must cascade-delete with run"


# ---------------------------------------------------------------------------
# P0-3: FK RESTRICT — deleting WorkflowTemplateRow with runs is blocked
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_fk_restrict_template_delete_blocked_by_run(db: Database) -> None:
    """Deleting a WorkflowTemplateRow that has a referencing RunRow must raise IntegrityError."""
    tid = _make_id()
    rid = _make_id()
    template = _workflow_template_row(tid)
    run = _run_row(rid, template_id=tid)

    async with db.session() as session:
        session.add(template)
        await session.flush()
        session.add(run)

    with pytest.raises(IntegrityError):
        async with db.session() as session:
            fetched = await session.get(WorkflowTemplateRow, tid)
            assert fetched is not None
            await session.delete(fetched)


# ---------------------------------------------------------------------------
# P0-1: partial unique index exists in sqlite_master after init_schema
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_active_run_partial_index_exists_in_schema(db: Database) -> None:
    """ux_active_run_repo_base partial unique index must exist after init_schema."""
    async with db.session() as session:
        result = await session.execute(
            text(
                "SELECT sql FROM sqlite_master "
                "WHERE type='index' AND name='ux_active_run_repo_base'"
            )
        )
        row = result.fetchone()
    assert row is not None, "ux_active_run_repo_base index missing from sqlite_master"
    assert "WHERE" in (row[0] or ""), f"Expected WHERE clause in index SQL, got: {row[0]}"