// Copyright 2026 Arctel.net
// SPDX-License-Identifier: Apache-2.0

package tasks

import (
	"context"
	"testing"
	"time"

	"github.com/Rain-kl/Wavelet/internal/db"
	"github.com/Rain-kl/Wavelet/internal/model"
	"github.com/Rain-kl/Wavelet/internal/repository"
	"github.com/glebarez/sqlite"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"gorm.io/gorm"
)

func setupDatabaseCleanupTestDB(t *testing.T) context.Context {
	t.Helper()

	sqliteDB, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{
		DisableForeignKeyConstraintWhenMigrating: true,
	})
	require.NoError(t, err)
	require.NoError(t, sqliteDB.AutoMigrate(&model.SystemConfig{}))
	db.SetDB(sqliteDB)
	resetAccessLogStore := model.SetAccessLogStoreForTest(model.NewMemoryAccessLogStore())
	resetObservabilityStore := model.SetObservabilityStoreForTest(model.NewMemoryObservabilityStore())
	t.Cleanup(func() {
		resetObservabilityStore()
		resetAccessLogStore()
		db.SetDB(nil)
	})
	return context.Background()
}

func TestCleanupDatabaseObservabilityDeletesTargetedRows(t *testing.T) {
	ctx := setupDatabaseCleanupTestDB(t)
	now := time.Now().UTC()

	require.NoError(t, model.InsertOpenFlareMetricSnapshot(ctx, &model.OpenFlareMetricSnapshot{
		NodeID:          "node-a",
		CapturedAt:      now.Add(-10 * 24 * time.Hour),
		CPUUsagePercent: 10,
	}))
	require.NoError(t, model.InsertOpenFlareMetricSnapshot(ctx, &model.OpenFlareMetricSnapshot{
		NodeID:          "node-a",
		CapturedAt:      now.Add(-12 * time.Hour),
		CPUUsagePercent: 20,
	}))

	retentionDays := 7
	result, err := CleanupDatabaseObservability(ctx, DatabaseCleanupInput{
		Target:        DatabaseCleanupTargetMetricSnapshots,
		RetentionDays: &retentionDays,
	})
	require.NoError(t, err)
	assert.False(t, result.DeleteAll)
	assert.Equal(t, int64(1), result.DeletedCount)

	rows, err := model.ListOpenFlareMetricSnapshotsSince(ctx, "", time.Time{}, 0)
	require.NoError(t, err)
	require.Len(t, rows, 1)
	assert.Equal(t, float64(20), rows[0].CPUUsagePercent)
}

func TestCleanupDatabaseObservabilityDeletesAllRowsWhenRetentionMissing(t *testing.T) {
	ctx := setupDatabaseCleanupTestDB(t)
	now := time.Now().UTC()

	require.NoError(t, model.InsertOpenFlareAccessLogsBatch(ctx, []*model.OpenFlareAccessLog{
		{
			NodeID:     "node-a",
			LoggedAt:   now.Add(-3 * time.Hour),
			RemoteAddr: "203.0.113.1",
			Host:       "example.com",
			Path:       "/one",
			StatusCode: 200,
		},
		{
			NodeID:     "node-a",
			LoggedAt:   now.Add(-2 * time.Hour),
			RemoteAddr: "203.0.113.2",
			Host:       "example.com",
			Path:       "/two",
			StatusCode: 502,
		},
	}))

	result, err := CleanupDatabaseObservability(ctx, DatabaseCleanupInput{
		Target: DatabaseCleanupTargetAccessLogs,
	})
	require.NoError(t, err)
	assert.True(t, result.DeleteAll)
	assert.Equal(t, int64(2), result.DeletedCount)

	rows, err := model.ListOpenFlareAccessLogs(ctx, model.OpenFlareAccessLogQuery{Page: 0, PageSize: 10})
	require.NoError(t, err)
	assert.Empty(t, rows)
}

func TestRunDatabaseAutoCleanupOnceDeletesAllObservabilityTargets(t *testing.T) {
	ctx := setupDatabaseCleanupTestDB(t)
	now := time.Now().UTC()

	require.NoError(t, model.InsertOpenFlareAccessLogsBatch(ctx, []*model.OpenFlareAccessLog{{
		NodeID:     "node-a",
		LoggedAt:   now.Add(-48 * time.Hour),
		RemoteAddr: "203.0.113.10",
		Host:       "example.com",
		Path:       "/access",
		StatusCode: 200,
	}}))
	require.NoError(t, model.InsertOpenFlareMetricSnapshot(ctx, &model.OpenFlareMetricSnapshot{
		NodeID:          "node-a",
		CapturedAt:      now.Add(-48 * time.Hour),
		CPUUsagePercent: 10,
	}))
	require.NoError(t, model.InsertOpenFlareRequestReport(ctx, &model.OpenFlareRequestReport{
		NodeID:          "node-a",
		WindowStartedAt: now.Add(-49 * time.Hour),
		WindowEndedAt:   now.Add(-48 * time.Hour),
		RequestCount:    15,
	}))

	require.NoError(t, repository.SaveOrUpdateSystemConfig(ctx, model.ConfigKeyDatabaseAutoCleanupEnabled, "true"))
	require.NoError(t, repository.SaveOrUpdateSystemConfig(ctx, model.ConfigKeyDatabaseAutoCleanupRetentionDays, "1"))

	summary, err := RunDatabaseAutoCleanupOnce(ctx, now)
	require.NoError(t, err)
	require.NotNil(t, summary)
	require.Len(t, summary.Results, 3)

	accessLogs, err := model.ListOpenFlareAccessLogs(ctx, model.OpenFlareAccessLogQuery{Page: 0, PageSize: 10})
	require.NoError(t, err)
	assert.Empty(t, accessLogs)

	metricSnapshots, err := model.ListOpenFlareMetricSnapshotsSince(ctx, "", time.Time{}, 0)
	require.NoError(t, err)
	assert.Empty(t, metricSnapshots)

	requestReports, err := model.ListOpenFlareRequestReportsSince(ctx, "", time.Time{}, 0)
	require.NoError(t, err)
	assert.Empty(t, requestReports)
}