"""E2E: Backup and restore flow.

Tests creating entities, backing up (SQLite .db file), deleting, then restoring.
"""

import io


class TestBackupRestoreFlow:
    """A user backs up their configuration and restores it."""

    def _create_device(self, client, name="Backup Device") -> str:
        resp = client.post("/api/v1/devices", json={
            "name": name,
            "url": "mock://backup",
            "device_type": "mock",
            "led_count": 30,
        })
        assert resp.status_code == 201
        return resp.json()["id"]

    def _create_css(self, client, name="Backup CSS") -> str:
        resp = client.post("/api/v1/color-strip-sources", json={
            "name": name,
            "source_type": "static",
            "color": [255, 0, 0],
            "led_count": 30,
        })
        assert resp.status_code == 201
        return resp.json()["id"]

    def test_backup_and_restore_roundtrip(self, client):
        # 1. Create some entities
        device_id = self._create_device(client, "Device for Backup")
        css_id = self._create_css(client, "CSS for Backup")

        # Verify entities exist
        resp = client.get("/api/v1/devices")
        assert resp.json()["count"] == 1
        resp = client.get("/api/v1/color-strip-sources")
        assert resp.json()["count"] == 1

        # 2. Create a backup (GET returns a SQLite .db file)
        resp = client.get("/api/v1/system/backup")
        assert resp.status_code == 200
        backup_bytes = resp.content
        # SQLite files start with this magic header
        assert backup_bytes[:16].startswith(b"SQLite format 3")

        # 3. Delete all created entities
        resp = client.delete(f"/api/v1/color-strip-sources/{css_id}")
        assert resp.status_code == 204
        resp = client.delete(f"/api/v1/devices/{device_id}")
        assert resp.status_code == 204

        # Verify they're gone
        resp = client.get("/api/v1/devices")
        assert resp.json()["count"] == 0
        resp = client.get("/api/v1/color-strip-sources")
        assert resp.json()["count"] == 0

        # 4. Restore from backup (POST with the .db file upload)
        resp = client.post(
            "/api/v1/system/restore",
            files={"file": ("backup.db", io.BytesIO(backup_bytes), "application/octet-stream")},
        )
        assert resp.status_code == 200, f"Restore failed: {resp.text}"
        restore_result = resp.json()
        assert restore_result["status"] == "restored"
        assert restore_result["restart_scheduled"] is True

    def test_backup_is_valid_sqlite(self, client):
        """Backup response is a valid SQLite database file."""
        resp = client.get("/api/v1/system/backup")
        assert resp.status_code == 200
        assert resp.content[:16].startswith(b"SQLite format 3")
        # Should have Content-Disposition header for download
        assert "attachment" in resp.headers.get("content-disposition", "")

    def test_restore_rejects_invalid_format(self, client):
        """Uploading a non-SQLite file should fail validation."""
        bad_data = b"not a database file at all, just random text content"
        resp = client.post(
            "/api/v1/system/restore",
            files={"file": ("bad.db", io.BytesIO(bad_data), "application/octet-stream")},
        )
        assert resp.status_code == 400

    def test_restore_rejects_empty_file(self, client):
        """A tiny file should fail validation."""
        resp = client.post(
            "/api/v1/system/restore",
            files={"file": ("tiny.db", io.BytesIO(b"x" * 50), "application/octet-stream")},
        )
        assert resp.status_code == 400