package casbin

import (
	"git.noahlan.cn/noahlan/ntool-biz/core/config"
	"git.noahlan.cn/noahlan/ntool/nlog"
	"github.com/casbin/casbin/v2"
	"github.com/casbin/casbin/v2/model"
	"github.com/casbin/casbin/v2/persist"
	entadapter "github.com/casbin/ent-adapter"
	rediswatcher "github.com/casbin/redis-watcher/v2"
	redis2 "github.com/redis/go-redis/v9"
)

type CasbinConf struct {
	ModelText string `json:"ModelText,optional"`
}

func (l CasbinConf) NewCasbin(dbType, dsn string) (*casbin.Enforcer, error) {
	adapter, err := entadapter.NewAdapter(dbType, dsn)
	if err != nil {
		nlog.Errorf("NCasbin new ent-adapter err: %v", err)
		return nil, err
	}
	text := l.ModelText
	if l.ModelText == "" {
		text = `
		[request_definition]
		r = sub, obj, act
		
		[policy_definition]
		p = sub, obj, act
		
		[role_definition]
		g = _, _
		
		[policy_effect]
		e = some(where (p.eft == allow))
		
		[matchers]
		m = r.sub == p.sub && keyMatch2(r.obj,p.obj) && r.act == p.act
		`
	}

	m, err := model.NewModelFromString(text)
	if err != nil {
		nlog.Errorf("NCasbin new Model err: %v", err)
		return nil, err
	}

	enforcer, err := casbin.NewEnforcer(m, adapter)
	if err != nil {
		nlog.Errorf("NCasbin NewEnforcer err: %v", err)
		return nil, err
	}

	err = enforcer.LoadPolicy()
	if err != nil {
		nlog.Errorf("NCasbin LoadPolicy err: %v", err)
		return nil, err
	}

	return enforcer, nil
}

func (l CasbinConf) MustNewCasbin(dbType, dsn string) *casbin.Enforcer {
	csb, err := l.NewCasbin(dbType, dsn)
	nlog.Must(err)

	return csb
}

// MustNewRedisWatcher returns redis watcher. If there are errors, it will exist.
// f function will be called if the policies are updated.
func (l CasbinConf) MustNewRedisWatcher(c config.RedisConf, f func(string2 string)) persist.Watcher {
	w, err := rediswatcher.NewWatcher(c.Addr, rediswatcher.WatcherOptions{
		Options: redis2.Options{
			Network:  c.Network,
			Password: c.Password,
		},
		Channel:    "/casbin",
		IgnoreSelf: false,
	})
	nlog.Must(err)

	err = w.SetUpdateCallback(f)
	nlog.Must(err)

	return w
}

// MustNewCasbinWithRedisWatcher returns Casbin Enforcer with Redis watcher.
func (l CasbinConf) MustNewCasbinWithRedisWatcher(dbType, dsn string, c config.RedisConf) *casbin.Enforcer {
	cbn := l.MustNewCasbin(dbType, dsn)
	w := l.MustNewRedisWatcher(c, func(data string) {
		rediswatcher.DefaultUpdateCallback(cbn)(data)
	})
	err := cbn.SetWatcher(w)
	nlog.Must(err)

	err = cbn.SavePolicy()
	nlog.Must(err)

	return cbn
}