"""Tests for data retention and lifecycle controls.

Validates retention policy resolution, expired object detection,
cleanup logic, and DB record cleanup.

Requirements: N3
"""
from datetime import datetime, timedelta, timezone
from unittest.mock import MagicMock

from services.shared.config import RetentionConfig
from services.shared.retention import (
    RetentionPolicy,
    cleanup_bucket,
    cutoff_date,
    default_retention_days,
    delete_expired_objects,
    list_expired_objects,
    merge_policies,
    resolve_policies,
)


class TestDefaultRetentionDays:
    def test_known_buckets(self):
        config = RetentionConfig()
        assert default_retention_days("stonks-raw-market", config) == 90
        assert default_retention_days("stonks-raw-news", config) == 180
        assert default_retention_days("stonks-raw-filings", config) == 365
        assert default_retention_days("stonks-lakehouse", config) == 730
        assert default_retention_days("stonks-audit", config) == 730

    def test_unknown_bucket_defaults_to_365(self):
        config = RetentionConfig()
        assert default_retention_days("unknown-bucket", config) == 365

    def test_custom_config_values(self):
        config = RetentionConfig(raw_market_days=30, audit_days=1000)
        assert default_retention_days("stonks-raw-market", config) == 30
        assert default_retention_days("stonks-audit", config) == 1000


class TestResolvePolicies:
    def test_returns_policy_per_bucket(self):
        config = RetentionConfig()
        policies = resolve_policies(config)
        bucket_names = [p.bucket_name for p in policies]
        assert "stonks-raw-market" in bucket_names
        assert "stonks-lakehouse" in bucket_names
        assert len(policies) == 8

    def test_uses_config_values(self):
        config = RetentionConfig(raw_news_days=60)
        policies = resolve_policies(config)
        news_policy = next(p for p in policies if p.bucket_name == "stonks-raw-news")
        assert news_policy.retention_days == 60


class TestMergePolicies:
    def test_db_overrides_config(self):
        config_policies = [
            RetentionPolicy("stonks-raw-market", 90),
            RetentionPolicy("stonks-raw-news", 180),
        ]
        db_policies = {
            "stonks-raw-market": RetentionPolicy("stonks-raw-market", 30),
        }
        merged = merge_policies(config_policies, db_policies)
        market = next(p for p in merged if p.bucket_name == "stonks-raw-market")
        news = next(p for p in merged if p.bucket_name == "stonks-raw-news")
        assert market.retention_days == 30  # DB override
        assert news.retention_days == 180  # config default

    def test_empty_db_uses_all_config(self):
        config_policies = [RetentionPolicy("stonks-audit", 730)]
        merged = merge_policies(config_policies, {})
        assert len(merged) == 1
        assert merged[0].retention_days == 730


class TestCutoffDate:
    def test_calculates_cutoff(self):
        now = datetime(2026, 4, 11, 12, 0, 0, tzinfo=timezone.utc)
        cutoff = cutoff_date(90, now)
        expected = now - timedelta(days=90)
        assert cutoff == expected

    def test_uses_current_time_when_none(self):
        cutoff = cutoff_date(30)
        assert cutoff < datetime.now(timezone.utc)


class TestListExpiredObjects:
    def test_finds_expired_objects(self):
        client = MagicMock()
        now = datetime(2026, 4, 11, 12, 0, 0, tzinfo=timezone.utc)

        old_obj = MagicMock()
        old_obj.object_name = "old/file.json"
        old_obj.last_modified = now - timedelta(days=100)

        new_obj = MagicMock()
        new_obj.object_name = "new/file.json"
        new_obj.last_modified = now - timedelta(days=10)

        client.list_objects.return_value = [old_obj, new_obj]

        expired = list_expired_objects(client, "stonks-raw-market", 90, now=now)
        assert expired == ["old/file.json"]

    def test_respects_batch_size(self):
        client = MagicMock()
        now = datetime(2026, 4, 11, 12, 0, 0, tzinfo=timezone.utc)

        objects = []
        for i in range(10):
            obj = MagicMock()
            obj.object_name = f"file_{i}.json"
            obj.last_modified = now - timedelta(days=200)
            objects.append(obj)

        client.list_objects.return_value = objects
        expired = list_expired_objects(client, "test-bucket", 90, batch_size=3, now=now)
        assert len(expired) == 3

    def test_handles_list_error(self):
        client = MagicMock()
        client.list_objects.side_effect = Exception("connection error")
        expired = list_expired_objects(client, "test-bucket", 90)
        assert expired == []


class TestDeleteExpiredObjects:
    def test_deletes_all(self):
        client = MagicMock()
        count = delete_expired_objects(client, "test-bucket", ["a.json", "b.json"])
        assert count == 2
        assert client.remove_object.call_count == 2

    def test_handles_partial_failure(self):
        client = MagicMock()
        client.remove_object.side_effect = [None, Exception("fail"), None]
        count = delete_expired_objects(client, "test-bucket", ["a", "b", "c"])
        assert count == 2


class TestCleanupBucket:
    def test_full_cleanup_flow(self):
        client = MagicMock()
        now = datetime(2026, 4, 11, 12, 0, 0, tzinfo=timezone.utc)

        old_obj = MagicMock()
        old_obj.object_name = "expired.json"
        old_obj.last_modified = now - timedelta(days=200)
        client.list_objects.return_value = [old_obj]

        policy = RetentionPolicy("stonks-raw-market", 90)
        result = cleanup_bucket(client, policy, now=now)

        assert result.bucket_name == "stonks-raw-market"
        assert result.objects_scanned == 1
        assert result.objects_deleted == 1

    def test_no_expired_objects(self):
        client = MagicMock()
        client.list_objects.return_value = []

        policy = RetentionPolicy("stonks-raw-news", 180)
        result = cleanup_bucket(client, policy)

        assert result.objects_scanned == 0
        assert result.objects_deleted == 0