import os
import json
from datetime import datetime, timezone
from unittest.mock import AsyncMock, patch, MagicMock
from uuid import uuid4

import pytest
from httpx import AsyncClient
from tests.conftest import get_auth_headers


MOCK_REMOTE_EQUIPMENT = [
    {
        "id": "dt-001",
        "equipmentName": "Press Machine 1",
        "equipmentId": "PM-001",
        "model": "XM-200",
        "manufacturer": "TestCorp",
        "installationDate": "2024-01-15T00:00:00Z",
        "location": "Bay 1",
        "capacity": "200t",
        "powerConsumption": "50kW",
        "updatedAt": "2025-01-01T00:00:00Z",
    },
    {
        "id": "dt-002",
        "equipmentName": "Press Machine 2",
        "equipmentId": "PM-002",
        "model": "XM-300",
        "manufacturer": "TestCorp",
        "installationDate": "2024-06-01T00:00:00Z",
        "location": "Bay 2",
        "capacity": "300t",
        "powerConsumption": "75kW",
        "updatedAt": "2025-01-01T00:00:00Z",
    },
]


@pytest.mark.asyncio
async def test_import_preview(client: AsyncClient, seeded_db):
    headers = await get_auth_headers(client)

    with patch(
        "src.services.equipment_sync.EquipmentSyncService.fetch_remote_equipment",
        new_callable=AsyncMock,
    ) as mock_fetch:
        mock_fetch.return_value = MOCK_REMOTE_EQUIPMENT

        with patch.dict(os.environ, {"DIGITAL_TWIN_API_URL": "http://mock-api"}):
            resp = await client.get(
                "/api/test-co/machines/import/preview", headers=headers
            )

    assert resp.status_code == 200
    data = resp.json()
    assert "equipment" in data
    assert data["total"] == 2
    assert len(data["equipment"]) == 2
    assert data["equipment"][0]["id"] == "dt-001"
    assert data["equipment"][0]["name"] == "Press Machine 1"
    assert data["equipment"][0]["equipment_code"] == "PM-001"
    assert data["equipment"][0]["already_imported"] is False


@pytest.mark.asyncio
async def test_import_preview_marks_existing_as_imported(
    client: AsyncClient, seeded_db
):
    headers = await get_auth_headers(client)

    create_resp = await client.post(
        "/api/test-co/machines",
        json={"name": "Press Machine 1", "equipment_code": "PM-001"},
        headers=headers,
    )
    machine_id = create_resp.json()["id"]

    from sqlalchemy import select
    from src.database.models import Machine

    stmt = select(Machine).where(Machine.id == machine_id)
    machine = (await seeded_db.execute(stmt)).scalar_one()
    machine.external_id = "dt-001"
    machine.source = "digital-twin"
    await seeded_db.commit()

    with patch(
        "src.services.equipment_sync.EquipmentSyncService.fetch_remote_equipment",
        new_callable=AsyncMock,
    ) as mock_fetch:
        mock_fetch.return_value = MOCK_REMOTE_EQUIPMENT

        with patch.dict(os.environ, {"DIGITAL_TWIN_API_URL": "http://mock-api"}):
            resp = await client.get(
                "/api/test-co/machines/import/preview", headers=headers
            )

    assert resp.status_code == 200
    data = resp.json()
    assert data["equipment"][0]["already_imported"] is True
    assert data["equipment"][1]["already_imported"] is False


@pytest.mark.asyncio
async def test_import_equipment(client: AsyncClient, seeded_db):
    headers = await get_auth_headers(client)

    with patch(
        "src.services.equipment_sync.EquipmentSyncService.fetch_remote_equipment",
        new_callable=AsyncMock,
    ) as mock_fetch:
        mock_fetch.return_value = MOCK_REMOTE_EQUIPMENT

        with patch.dict(os.environ, {"DIGITAL_TWIN_API_URL": "http://mock-api"}):
            resp = await client.post(
                "/api/test-co/machines/import",
                json={},
                headers=headers,
            )

    assert resp.status_code == 200
    data = resp.json()
    assert data["imported_count"] == 2
    assert data["skipped_count"] == 0
    assert len(data["errors"]) == 0

    list_resp = await client.get("/api/test-co/machines", headers=headers)
    machines = list_resp.json()["machines"]
    assert len(machines) == 2
    assert machines[0]["source"] == "digital-twin"
    assert machines[0]["external_id"] == "dt-001"


@pytest.mark.asyncio
async def test_import_equipment_with_specific_ids(client: AsyncClient, seeded_db):
    headers = await get_auth_headers(client)

    with patch(
        "src.services.equipment_sync.EquipmentSyncService.fetch_remote_equipment",
        new_callable=AsyncMock,
    ) as mock_fetch:
        mock_fetch.return_value = MOCK_REMOTE_EQUIPMENT

        with patch.dict(os.environ, {"DIGITAL_TWIN_API_URL": "http://mock-api"}):
            resp = await client.post(
                "/api/test-co/machines/import",
                json={"external_ids": ["dt-001"]},
                headers=headers,
            )

    assert resp.status_code == 200
    data = resp.json()
    assert data["imported_count"] == 1
    assert data["skipped_count"] == 0

    list_resp = await client.get("/api/test-co/machines", headers=headers)
    machines = list_resp.json()["machines"]
    assert len(machines) == 1
    assert machines[0]["name"] == "Press Machine 1"


@pytest.mark.asyncio
async def test_import_skips_duplicates(client: AsyncClient, seeded_db):
    headers = await get_auth_headers(client)

    with patch(
        "src.services.equipment_sync.EquipmentSyncService.fetch_remote_equipment",
        new_callable=AsyncMock,
    ) as mock_fetch:
        mock_fetch.return_value = MOCK_REMOTE_EQUIPMENT

        with patch.dict(os.environ, {"DIGITAL_TWIN_API_URL": "http://mock-api"}):
            resp1 = await client.post(
                "/api/test-co/machines/import",
                json={},
                headers=headers,
            )

    assert resp1.status_code == 200
    assert resp1.json()["imported_count"] == 2

    with patch(
        "src.services.equipment_sync.EquipmentSyncService.fetch_remote_equipment",
        new_callable=AsyncMock,
    ) as mock_fetch:
        mock_fetch.return_value = MOCK_REMOTE_EQUIPMENT

        with patch.dict(os.environ, {"DIGITAL_TWIN_API_URL": "http://mock-api"}):
            resp2 = await client.post(
                "/api/test-co/machines/import",
                json={},
                headers=headers,
            )

    assert resp2.status_code == 200
    assert resp2.json()["imported_count"] == 0
    assert resp2.json()["skipped_count"] == 2


@pytest.mark.asyncio
async def test_sync_endpoint(client: AsyncClient, seeded_db):
    headers = await get_auth_headers(client)

    with patch(
        "src.services.equipment_sync.EquipmentSyncService.fetch_remote_equipment",
        new_callable=AsyncMock,
    ) as mock_fetch:
        mock_fetch.return_value = MOCK_REMOTE_EQUIPMENT

        with patch.dict(os.environ, {"DIGITAL_TWIN_API_URL": "http://mock-api"}):
            await client.post(
                "/api/test-co/machines/import",
                json={},
                headers=headers,
            )

    updated_equipment = [
        {
            "id": "dt-001",
            "equipmentName": "Press Machine 1 Updated",
            "equipmentId": "PM-001",
            "model": "XM-200-V2",
            "manufacturer": "TestCorp",
            "installationDate": "2024-01-15T00:00:00Z",
            "location": "Bay 1",
            "capacity": "200t",
            "powerConsumption": "50kW",
            "updatedAt": "2025-02-01T00:00:00Z",
        },
    ]

    with patch(
        "src.services.equipment_sync.EquipmentSyncService.fetch_remote_equipment",
        new_callable=AsyncMock,
    ) as mock_fetch:
        mock_fetch.return_value = updated_equipment

        with patch(
            "src.services.equipment_sync.EquipmentSyncService.push_to_remote",
            new_callable=AsyncMock,
        ) as mock_push:
            from src.services.equipment_sync import PushResult

            mock_push.return_value = PushResult(success=True, fields_pushed=["name"])

            with patch.dict(os.environ, {"DIGITAL_TWIN_API_URL": "http://mock-api"}):
                resp = await client.post(
                    "/api/test-co/machines/sync",
                    headers=headers,
                )

    assert resp.status_code == 200
    data = resp.json()
    assert "pull" in data
    assert "push_count" in data
    assert data["pull"]["synced_count"] == 1
    assert data["pull"]["fields_updated"] == 1


@pytest.mark.asyncio
async def test_machine_history_endpoint(client: AsyncClient, seeded_db):
    headers = await get_auth_headers(client)

    create_resp = await client.post(
        "/api/test-co/machines",
        json={"name": "Test Machine", "equipment_code": "TM-001"},
        headers=headers,
    )
    machine_id = create_resp.json()["id"]

    await client.put(
        f"/api/test-co/machines/{machine_id}",
        json={"name": "Test Machine Updated"},
        headers=headers,
    )

    resp = await client.get(
        f"/api/test-co/machines/{machine_id}/history",
        headers=headers,
    )

    assert resp.status_code == 200
    data = resp.json()
    assert "history" in data
    assert "total" in data
    assert data["total"] >= 1
    assert any(h["field_name"] == "name" for h in data["history"])


@pytest.mark.asyncio
async def test_machine_history_pagination(client: AsyncClient, seeded_db):
    headers = await get_auth_headers(client)

    create_resp = await client.post(
        "/api/test-co/machines",
        json={"name": "Test Machine", "equipment_code": "TM-001"},
        headers=headers,
    )
    machine_id = create_resp.json()["id"]

    for i in range(5):
        await client.put(
            f"/api/test-co/machines/{machine_id}",
            json={"description": f"Update {i}"},
            headers=headers,
        )

    resp = await client.get(
        f"/api/test-co/machines/{machine_id}/history?limit=2&offset=0",
        headers=headers,
    )

    assert resp.status_code == 200
    data = resp.json()
    assert len(data["history"]) == 2
    assert data["total"] >= 5


@pytest.mark.asyncio
async def test_update_machine_records_history(client: AsyncClient, seeded_db):
    headers = await get_auth_headers(client)

    create_resp = await client.post(
        "/api/test-co/machines",
        json={"name": "Original Name", "equipment_code": "OM-001"},
        headers=headers,
    )
    machine_id = create_resp.json()["id"]

    update_resp = await client.put(
        f"/api/test-co/machines/{machine_id}",
        json={
            "name": "Updated Name",
            "equipment_code": "UM-001",
            "model": "Model-X",
        },
        headers=headers,
    )

    assert update_resp.status_code == 200

    history_resp = await client.get(
        f"/api/test-co/machines/{machine_id}/history",
        headers=headers,
    )

    history = history_resp.json()["history"]
    assert len(history) >= 3

    name_change = next((h for h in history if h["field_name"] == "name"), None)
    assert name_change is not None
    assert name_change["old_value"] == "Original Name"
    assert name_change["new_value"] == "Updated Name"
    assert name_change["change_source"] == "local"

    code_change = next(
        (h for h in history if h["field_name"] == "equipment_code"), None
    )
    assert code_change is not None
    assert code_change["old_value"] == "OM-001"
    assert code_change["new_value"] == "UM-001"


@pytest.mark.asyncio
async def test_sync_without_config_returns_503(client: AsyncClient, seeded_db):
    headers = await get_auth_headers(client)

    with patch.dict(os.environ, {}, clear=False):
        if "DIGITAL_TWIN_API_URL" in os.environ:
            del os.environ["DIGITAL_TWIN_API_URL"]

        resp = await client.post(
            "/api/test-co/machines/sync",
            headers=headers,
        )

    assert resp.status_code == 503
    assert "DIGITAL_TWIN_API_URL" in resp.json()["detail"]


@pytest.mark.asyncio
async def test_import_without_config_returns_503(client: AsyncClient, seeded_db):
    headers = await get_auth_headers(client)

    with patch.dict(os.environ, {}, clear=False):
        if "DIGITAL_TWIN_API_URL" in os.environ:
            del os.environ["DIGITAL_TWIN_API_URL"]

        resp = await client.post(
            "/api/test-co/machines/import",
            json={},
            headers=headers,
        )

    assert resp.status_code == 503
    assert "DIGITAL_TWIN_API_URL" in resp.json()["detail"]


@pytest.mark.asyncio
async def test_import_preview_without_config_returns_503(
    client: AsyncClient, seeded_db
):
    headers = await get_auth_headers(client)

    with patch.dict(os.environ, {}, clear=False):
        if "DIGITAL_TWIN_API_URL" in os.environ:
            del os.environ["DIGITAL_TWIN_API_URL"]

        resp = await client.get(
            "/api/test-co/machines/import/preview",
            headers=headers,
        )

    assert resp.status_code == 503
    assert "DIGITAL_TWIN_API_URL" in resp.json()["detail"]


@pytest.mark.asyncio
async def test_tenant_isolation_sync(client: AsyncClient, seeded_db):
    headers = await get_auth_headers(client)

    with patch(
        "src.services.equipment_sync.EquipmentSyncService.fetch_remote_equipment",
        new_callable=AsyncMock,
    ) as mock_fetch:
        mock_fetch.return_value = MOCK_REMOTE_EQUIPMENT

        with patch.dict(os.environ, {"DIGITAL_TWIN_API_URL": "http://mock-api"}):
            resp_test = await client.post(
                "/api/test-co/machines/import",
                json={},
                headers=headers,
            )

    assert resp_test.status_code == 200
    assert resp_test.json()["imported_count"] == 2

    list_test = await client.get("/api/test-co/machines", headers=headers)
    list_other = await client.get("/api/other-co/machines", headers=headers)

    assert len(list_test.json()["machines"]) == 2
    assert len(list_other.json()["machines"]) == 0


@pytest.mark.asyncio
async def test_sync_lww_logic_remote_wins(client: AsyncClient, seeded_db):
    headers = await get_auth_headers(client)

    with patch(
        "src.services.equipment_sync.EquipmentSyncService.fetch_remote_equipment",
        new_callable=AsyncMock,
    ) as mock_fetch:
        mock_fetch.return_value = MOCK_REMOTE_EQUIPMENT

        with patch.dict(os.environ, {"DIGITAL_TWIN_API_URL": "http://mock-api"}):
            await client.post(
                "/api/test-co/machines/import",
                json={"external_ids": ["dt-001"]},
                headers=headers,
            )

    machines_resp = await client.get("/api/test-co/machines", headers=headers)
    machine_id = machines_resp.json()["machines"][0]["id"]

    await client.put(
        f"/api/test-co/machines/{machine_id}",
        json={"name": "Local Update"},
        headers=headers,
    )

    remote_updated = [
        {
            "id": "dt-001",
            "equipmentName": "Remote Update",
            "equipmentId": "PM-001",
            "model": "XM-200",
            "manufacturer": "TestCorp",
            "installationDate": "2024-01-15T00:00:00Z",
            "location": "Bay 1",
            "capacity": "200t",
            "powerConsumption": "50kW",
            "updatedAt": "2025-02-11T12:00:00Z",
        },
    ]

    with patch(
        "src.services.equipment_sync.EquipmentSyncService.fetch_remote_equipment",
        new_callable=AsyncMock,
    ) as mock_fetch:
        mock_fetch.return_value = remote_updated

        with patch.dict(os.environ, {"DIGITAL_TWIN_API_URL": "http://mock-api"}):
            sync_resp = await client.post(
                "/api/test-co/machines/sync",
                headers=headers,
            )

    assert sync_resp.status_code == 200
    assert sync_resp.json()["pull"]["synced_count"] == 1

    updated_machine = await client.get(
        f"/api/test-co/machines/{machine_id}",
        headers=headers,
    )
    assert updated_machine.json()["name"] == "Remote Update"


@pytest.mark.asyncio
async def test_sync_lww_logic_local_wins(client: AsyncClient, seeded_db):
    headers = await get_auth_headers(client)

    with patch(
        "src.services.equipment_sync.EquipmentSyncService.fetch_remote_equipment",
        new_callable=AsyncMock,
    ) as mock_fetch:
        mock_fetch.return_value = MOCK_REMOTE_EQUIPMENT

        with patch.dict(os.environ, {"DIGITAL_TWIN_API_URL": "http://mock-api"}):
            await client.post(
                "/api/test-co/machines/import",
                json={"external_ids": ["dt-001"]},
                headers=headers,
            )

    machines_resp = await client.get("/api/test-co/machines", headers=headers)
    machine_id = machines_resp.json()["machines"][0]["id"]

    await client.put(
        f"/api/test-co/machines/{machine_id}",
        json={"name": "Local Update"},
        headers=headers,
    )

    remote_old = [
        {
            "id": "dt-001",
            "equipmentName": "Remote Old",
            "equipmentId": "PM-001",
            "model": "XM-200",
            "manufacturer": "TestCorp",
            "installationDate": "2024-01-15T00:00:00Z",
            "location": "Bay 1",
            "capacity": "200t",
            "powerConsumption": "50kW",
            "updatedAt": "2025-01-01T00:00:00Z",
        },
    ]

    with patch(
        "src.services.equipment_sync.EquipmentSyncService.fetch_remote_equipment",
        new_callable=AsyncMock,
    ) as mock_fetch:
        mock_fetch.return_value = remote_old

        with patch.dict(os.environ, {"DIGITAL_TWIN_API_URL": "http://mock-api"}):
            sync_resp = await client.post(
                "/api/test-co/machines/sync",
                headers=headers,
            )

    assert sync_resp.status_code == 200
    assert sync_resp.json()["pull"]["synced_count"] == 0

    unchanged_machine = await client.get(
        f"/api/test-co/machines/{machine_id}",
        headers=headers,
    )
    assert unchanged_machine.json()["name"] == "Local Update"


@pytest.mark.asyncio
async def test_unauthenticated_import_preview(client: AsyncClient, seeded_db):
    resp = await client.get("/api/test-co/machines/import/preview")
    assert resp.status_code == 401


@pytest.mark.asyncio
async def test_unauthenticated_import(client: AsyncClient, seeded_db):
    resp = await client.post("/api/test-co/machines/import", json={})
    assert resp.status_code == 401


@pytest.mark.asyncio
async def test_unauthenticated_sync(client: AsyncClient, seeded_db):
    resp = await client.post("/api/test-co/machines/sync")
    assert resp.status_code == 401


@pytest.mark.asyncio
async def test_tenant_access_denied_import_preview(client: AsyncClient, seeded_db):
    headers = await get_auth_headers(client, email="admin@test-co.com")

    resp = await client.get("/api/other-co/machines/import/preview", headers=headers)
    assert resp.status_code == 403


@pytest.mark.asyncio
async def test_tenant_access_denied_import(client: AsyncClient, seeded_db):
    headers = await get_auth_headers(client, email="admin@test-co.com")

    resp = await client.post(
        "/api/other-co/machines/import",
        json={},
        headers=headers,
    )
    assert resp.status_code == 403


@pytest.mark.asyncio
async def test_tenant_access_denied_sync(client: AsyncClient, seeded_db):
    headers = await get_auth_headers(client, email="admin@test-co.com")

    resp = await client.post("/api/other-co/machines/sync", headers=headers)
    assert resp.status_code == 403


@pytest.mark.asyncio
async def test_history_endpoint_empty_machine(client: AsyncClient, seeded_db):
    headers = await get_auth_headers(client)

    create_resp = await client.post(
        "/api/test-co/machines",
        json={"name": "No Changes Machine"},
        headers=headers,
    )
    machine_id = create_resp.json()["id"]

    resp = await client.get(
        f"/api/test-co/machines/{machine_id}/history",
        headers=headers,
    )

    assert resp.status_code == 200
    data = resp.json()
    assert data["total"] == 0
    assert len(data["history"]) == 0


@pytest.mark.asyncio
async def test_history_endpoint_nonexistent_machine(client: AsyncClient, seeded_db):
    headers = await get_auth_headers(client)

    fake_id = str(uuid4())
    resp = await client.get(
        f"/api/test-co/machines/{fake_id}/history",
        headers=headers,
    )

    assert resp.status_code == 200
    data = resp.json()
    assert data["total"] == 0
    assert len(data["history"]) == 0


@pytest.mark.asyncio
async def test_sync_version_increments(client: AsyncClient, seeded_db):
    headers = await get_auth_headers(client)

    with patch(
        "src.services.equipment_sync.EquipmentSyncService.fetch_remote_equipment",
        new_callable=AsyncMock,
    ) as mock_fetch:
        mock_fetch.return_value = MOCK_REMOTE_EQUIPMENT

        with patch.dict(os.environ, {"DIGITAL_TWIN_API_URL": "http://mock-api"}):
            await client.post(
                "/api/test-co/machines/import",
                json={"external_ids": ["dt-001"]},
                headers=headers,
            )

    machines_resp = await client.get("/api/test-co/machines", headers=headers)
    machine = machines_resp.json()["machines"][0]
    assert machine["sync_version"] == 1

    updated_equipment = [
        {
            "id": "dt-001",
            "equipmentName": "Press Machine 1 Updated",
            "equipmentId": "PM-001",
            "model": "XM-200-V2",
            "manufacturer": "TestCorp",
            "installationDate": "2024-01-15T00:00:00Z",
            "location": "Bay 1",
            "capacity": "200t",
            "powerConsumption": "50kW",
            "updatedAt": "2025-02-11T12:00:00Z",
        },
    ]

    with patch(
        "src.services.equipment_sync.EquipmentSyncService.fetch_remote_equipment",
        new_callable=AsyncMock,
    ) as mock_fetch:
        mock_fetch.return_value = updated_equipment

        with patch.dict(os.environ, {"DIGITAL_TWIN_API_URL": "http://mock-api"}):
            await client.post(
                "/api/test-co/machines/sync",
                headers=headers,
            )

    updated_resp = await client.get("/api/test-co/machines", headers=headers)
    updated_machine = updated_resp.json()["machines"][0]
    assert updated_machine["sync_version"] == 2