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

package analytics

import (
	"context"
	"errors"
	"fmt"
	"strings"
	"time"

	db "github.com/Rain-kl/Wavelet/internal/infra/persistence"
	"github.com/Rain-kl/Wavelet/internal/infra/persistence/idgen"
	analyticsmodel "github.com/Rain-kl/Wavelet/internal/model/analytics"
)

const edgeHealthStatusUnknown = "unknown"

// InsertNodeMetricSnapshot writes a single metric snapshot via the batch API.
func InsertNodeMetricSnapshot(ctx context.Context, snapshot analyticsmodel.NodeMetricSnapshot) error {
	if strings.TrimSpace(snapshot.NodeID) == "" {
		return nil
	}
	return BatchInsertNodeMetricSnapshots(ctx, []analyticsmodel.NodeMetricSnapshot{snapshot})
}

// BatchInsertNodeMetricSnapshots writes metric snapshots to ClickHouse.
func BatchInsertNodeMetricSnapshots(ctx context.Context, snapshots []analyticsmodel.NodeMetricSnapshot) error {
	if len(snapshots) == 0 {
		return nil
	}
	if db.ChConn == nil {
		return errors.New("clickhouse connection is not initialized")
	}

	batch, err := db.ChConn.PrepareBatch(ctx, analyticsmodel.NodeMetricSnapshot{}.BatchInsertSQL())
	if err != nil {
		return fmt.Errorf("prepare clickhouse batch: %w", err)
	}

	now := time.Now().UTC()
	for _, snapshot := range snapshots {
		nodeID := strings.TrimSpace(snapshot.NodeID)
		if nodeID == "" {
			continue
		}
		id := snapshot.ID
		if id == 0 {
			id = idgen.NextUint64ID()
		}
		createdAt := snapshot.CreatedAt
		if createdAt.IsZero() {
			createdAt = now
		}
		if err := batch.Append(
			id,
			nodeID,
			snapshot.CapturedAt.UTC(),
			snapshot.CPUUsagePercent,
			snapshot.MemoryUsedBytes,
			snapshot.MemoryTotalBytes,
			snapshot.StorageUsedBytes,
			snapshot.StorageTotalBytes,
			snapshot.DiskReadBytes,
			snapshot.DiskWriteBytes,
			snapshot.NetworkRxBytes,
			snapshot.NetworkTxBytes,
			createdAt.UTC(),
		); err != nil {
			return fmt.Errorf("append node metric snapshot to batch: %w", err)
		}
	}

	if batch.Rows() == 0 {
		return nil
	}
	if err := batch.Send(); err != nil {
		return fmt.Errorf("send clickhouse batch: %w", err)
	}
	return nil
}

func normalizeEdgeHealthStatus(status string) string {
	status = strings.TrimSpace(status)
	if status == "" {
		return edgeHealthStatusUnknown
	}
	return status
}

// InsertNodeEdgeHealth writes a single edge health snapshot.
func InsertNodeEdgeHealth(ctx context.Context, row analyticsmodel.NodeEdgeHealth) error {
	if strings.TrimSpace(row.NodeID) == "" {
		return nil
	}
	return BatchInsertNodeEdgeHealth(ctx, []analyticsmodel.NodeEdgeHealth{row})
}

// BatchInsertNodeEdgeHealth writes L2 OpenResty health snapshots to ClickHouse.
func BatchInsertNodeEdgeHealth(ctx context.Context, rows []analyticsmodel.NodeEdgeHealth) error {
	if len(rows) == 0 {
		return nil
	}
	if db.ChConn == nil {
		return errors.New("clickhouse connection is not initialized")
	}
	batch, err := db.ChConn.PrepareBatch(ctx, analyticsmodel.NodeEdgeHealth{}.BatchInsertSQL())
	if err != nil {
		return fmt.Errorf("prepare clickhouse batch: %w", err)
	}
	now := time.Now().UTC()
	for _, row := range rows {
		nodeID := strings.TrimSpace(row.NodeID)
		if nodeID == "" {
			continue
		}
		id := row.ID
		if id == 0 {
			id = idgen.NextUint64ID()
		}
		createdAt := row.CreatedAt
		if createdAt.IsZero() {
			createdAt = now
		}
		capturedAt := row.CapturedAt.UTC()
		if capturedAt.IsZero() {
			capturedAt = now
		}
		if err := batch.Append(
			id,
			nodeID,
			capturedAt,
			normalizeEdgeHealthStatus(row.Status),
			row.Connections,
			createdAt.UTC(),
		); err != nil {
			return fmt.Errorf("append node edge health to batch: %w", err)
		}
	}
	if batch.Rows() == 0 {
		return nil
	}
	if err := batch.Send(); err != nil {
		return fmt.Errorf("send clickhouse batch: %w", err)
	}
	return nil
}

// InsertNodeObsFrps writes a single FRPS observation via the batch API.
func InsertNodeObsFrps(ctx context.Context, obs analyticsmodel.NodeObsFrps) error {
	if strings.TrimSpace(obs.NodeID) == "" {
		return nil
	}
	return BatchInsertNodeObsFrps(ctx, []analyticsmodel.NodeObsFrps{obs})
}

// BatchInsertNodeObsFrps writes FRPS observations to ClickHouse.
func BatchInsertNodeObsFrps(ctx context.Context, observations []analyticsmodel.NodeObsFrps) error {
	if len(observations) == 0 {
		return nil
	}
	if db.ChConn == nil {
		return errors.New("clickhouse connection is not initialized")
	}

	batch, err := db.ChConn.PrepareBatch(ctx, analyticsmodel.NodeObsFrps{}.BatchInsertSQL())
	if err != nil {
		return fmt.Errorf("prepare clickhouse batch: %w", err)
	}

	now := time.Now().UTC()
	for _, obs := range observations {
		nodeID := strings.TrimSpace(obs.NodeID)
		if nodeID == "" {
			continue
		}
		id := obs.ID
		if id == 0 {
			id = idgen.NextUint64ID()
		}
		createdAt := obs.CreatedAt
		if createdAt.IsZero() {
			createdAt = now
		}
		capturedAt := obs.CapturedAt.UTC()
		if capturedAt.IsZero() {
			capturedAt = now
		}
		if err := batch.Append(
			id,
			nodeID,
			capturedAt,
			obs.FrpsConnections,
			obs.FrpsProxyCount,
			obs.FrpsClientCount,
			obs.FrpsProxies,
			createdAt.UTC(),
		); err != nil {
			return fmt.Errorf("append node frps observation to batch: %w", err)
		}
	}

	if batch.Rows() == 0 {
		return nil
	}
	if err := batch.Send(); err != nil {
		return fmt.Errorf("send clickhouse batch: %w", err)
	}
	return nil
}

// InsertNodeObsFrpc writes a single FRPC observation via the batch API.
func InsertNodeObsFrpc(ctx context.Context, obs analyticsmodel.NodeObsFrpc) error {
	if strings.TrimSpace(obs.NodeID) == "" {
		return nil
	}
	return BatchInsertNodeObsFrpc(ctx, []analyticsmodel.NodeObsFrpc{obs})
}

// BatchInsertNodeObsFrpc writes FRPC observations to ClickHouse.
func BatchInsertNodeObsFrpc(ctx context.Context, observations []analyticsmodel.NodeObsFrpc) error {
	if len(observations) == 0 {
		return nil
	}
	if db.ChConn == nil {
		return errors.New("clickhouse connection is not initialized")
	}

	batch, err := db.ChConn.PrepareBatch(ctx, analyticsmodel.NodeObsFrpc{}.BatchInsertSQL())
	if err != nil {
		return fmt.Errorf("prepare clickhouse batch: %w", err)
	}

	now := time.Now().UTC()
	for _, obs := range observations {
		nodeID := strings.TrimSpace(obs.NodeID)
		if nodeID == "" {
			continue
		}
		id := obs.ID
		if id == 0 {
			id = idgen.NextUint64ID()
		}
		createdAt := obs.CreatedAt
		if createdAt.IsZero() {
			createdAt = now
		}
		capturedAt := obs.CapturedAt.UTC()
		if capturedAt.IsZero() {
			capturedAt = now
		}
		if err := batch.Append(
			id,
			nodeID,
			capturedAt,
			obs.TunnelStatus,
			obs.ConnectedRelaysCount,
			createdAt.UTC(),
		); err != nil {
			return fmt.Errorf("append node frpc observation to batch: %w", err)
		}
	}

	if batch.Rows() == 0 {
		return nil
	}
	if err := batch.Send(); err != nil {
		return fmt.Errorf("send clickhouse batch: %w", err)
	}
	return nil
}