package diagram

import (
	"context"

	distributed_lock "modelRT/distributedlock"
	locker "modelRT/distributedlock"
	"modelRT/logger"

	"github.com/redis/go-redis/v9"

	"go.uber.org/zap"
)

// RedisHash defines the encapsulation struct of redis hash type
type RedisHash struct {
	ctx           context.Context
	rwLocker      *locker.RedissionRWLocker
	storageClient *redis.Client
	logger        *zap.Logger
}

// NewRedisHash define func of new redis hash instance
func NewRedisHash(ctx context.Context, hashKey string, token string, lockLeaseTime uint64, needRefresh bool) *RedisHash {
	return &RedisHash{
		ctx:           ctx,
		rwLocker:      distributed_lock.InitRWLocker(hashKey, token, lockLeaseTime, needRefresh),
		storageClient: GetRedisClientInstance(),
		logger:        logger.GetLoggerInstance(),
	}
}

// SetRedisHashByMap define func of set redis hash by map struct
func (rh *RedisHash) SetRedisHashByMap(hashKey string, fields map[string]interface{}) error {
	err := rh.rwLocker.WLock(rh.ctx)
	if err != nil {
		rh.logger.Error("lock wLock by hashKey failed", zap.String("hashKey", hashKey), zap.Error(err))
		return err
	}
	defer rh.rwLocker.UnWLock(rh.ctx)

	err = rh.storageClient.HSet(rh.ctx, hashKey, fields).Err()
	if err != nil {
		rh.logger.Error("set hash by map failed", zap.String("hashKey", hashKey), zap.Any("fields", fields), zap.Error(err))
		return err
	}
	return nil
}

// SetRedisHashByKV define func of set redis hash by kv struct
func (rh *RedisHash) SetRedisHashByKV(hashKey string, field string, value interface{}) error {
	err := rh.rwLocker.WLock(rh.ctx)
	if err != nil {
		rh.logger.Error("lock wLock by hashKey failed", zap.String("hashKey", hashKey), zap.Error(err))
		return err
	}
	defer rh.rwLocker.UnWLock(rh.ctx)

	err = rh.storageClient.HSet(rh.ctx, hashKey, field, value).Err()
	if err != nil {
		rh.logger.Error("set hash by kv failed", zap.String("hashKey", hashKey), zap.String("field", field), zap.Any("value", value), zap.Error(err))
		return err
	}
	return nil
}

// HGet define func of get specified field value from redis hash by key and field name
func (rh *RedisHash) HGet(hashKey string, field string) (string, error) {
	err := rh.rwLocker.RLock(rh.ctx)
	if err != nil {
		rh.logger.Error("lock rLock by hashKey failed", zap.String("hashKey", hashKey), zap.Error(err))
		return "", err
	}
	defer rh.rwLocker.UnRLock(rh.ctx)

	result, err := rh.storageClient.HGet(rh.ctx, hashKey, field).Result()
	if err != nil {
		rh.logger.Error("set hash by kv failed", zap.String("hashKey", hashKey), zap.String("field", field), zap.Error(err))
		return "", err
	}
	return result, nil
}

// HGetAll define func of get all filelds from redis hash by key
func (rh *RedisHash) HGetAll(hashKey string) (map[string]string, error) {
	err := rh.rwLocker.RLock(rh.ctx)
	if err != nil {
		rh.logger.Error("lock rLock by hashKey failed", zap.String("hashKey", hashKey), zap.Error(err))
		return nil, err
	}
	defer rh.rwLocker.UnRLock(rh.ctx)

	result, err := rh.storageClient.HGetAll(rh.ctx, hashKey).Result()
	if err != nil {
		rh.logger.Error("get all hash field by hash key failed", zap.String("hashKey", hashKey), zap.Error(err))
		return nil, err
	}
	return result, nil
}