package cache

import "fmt"

var drivers = make(map[string]Driver)

func Register(name string, driver Driver) {
	if driver == nil {
		panic("cache: Register driver is nil")
	}
	if _, dup := drivers[name]; dup {
		panic("cache: Register called twice for driver " + name)
	}
	drivers[name] = driver
}

func Open(config *Config) (Cache, error) {
	if config.Driver == "redis" {
		return NewRedis(config)
	}

	driver, ok := drivers[config.Driver]
	if !ok {
		return nil, fmt.Errorf("unknown driver %q (forgotten import?)", config.Driver)
	}

	return driver.Cache(config)
}