// Package redisadapter provides the Redis client helpers used by Notification
// Service runtime wiring.
package redisadapter

import (
	"context"
	"fmt"

	"galaxy/notification/internal/config"
	"galaxy/notification/internal/telemetry"

	"github.com/redis/go-redis/extra/redisotel/v9"
	"github.com/redis/go-redis/v9"
)

// NewClient constructs one Redis client from cfg.
func NewClient(cfg config.RedisConfig) *redis.Client {
	return redis.NewClient(&redis.Options{
		Addr:         cfg.Addr,
		Username:     cfg.Username,
		Password:     cfg.Password,
		DB:           cfg.DB,
		TLSConfig:    cfg.TLSConfig(),
		DialTimeout:  cfg.OperationTimeout,
		ReadTimeout:  cfg.OperationTimeout,
		WriteTimeout: cfg.OperationTimeout,
	})
}

// InstrumentClient attaches Redis tracing and metrics exporters to client when
// telemetryRuntime is available.
func InstrumentClient(client *redis.Client, telemetryRuntime *telemetry.Runtime) error {
	if client == nil {
		return fmt.Errorf("instrument redis client: nil client")
	}
	if telemetryRuntime == nil {
		return nil
	}

	if err := redisotel.InstrumentTracing(
		client,
		redisotel.WithTracerProvider(telemetryRuntime.TracerProvider()),
		redisotel.WithDBStatement(false),
	); err != nil {
		return fmt.Errorf("instrument redis client tracing: %w", err)
	}
	if err := redisotel.InstrumentMetrics(
		client,
		redisotel.WithMeterProvider(telemetryRuntime.MeterProvider()),
	); err != nil {
		return fmt.Errorf("instrument redis client metrics: %w", err)
	}

	return nil
}

// Ping performs the startup Redis connectivity check bounded by
// cfg.OperationTimeout.
func Ping(ctx context.Context, cfg config.RedisConfig, client *redis.Client) error {
	if client == nil {
		return fmt.Errorf("ping redis: nil client")
	}

	pingCtx, cancel := context.WithTimeout(ctx, cfg.OperationTimeout)
	defer cancel()

	if err := client.Ping(pingCtx).Err(); err != nil {
		return fmt.Errorf("ping redis: %w", err)
	}

	return nil
}