package publock

import (
	"time"

	"gitlink.org.cn/cloudream/jcs-pub/client/internal/publock/reqbuilder"
	"gitlink.org.cn/cloudream/jcs-pub/client/internal/publock/types"
)

type Reentrant struct {
	reqbuilder.LockRequestBuilder[*Reentrant]
	p      *PubLock
	reqs   []types.LockRequest
	locked []LockedRequest
}

func (r *Reentrant) Lock(opts ...AcquireOptionFn) error {
	var opt = types.AcquireOption{
		Timeout: time.Second * 10,
	}
	for _, fn := range opts {
		fn(&opt)
	}

	var willLock []types.Lock

loop:
	for _, lock := range r.LockRequestBuilder.Locks {
		for _, req := range r.reqs {
			for _, locked := range req.Locks {
				if locked.Equals(lock) {
					continue loop
				}
			}
		}

		willLock = append(willLock, lock)
	}
	r.LockRequestBuilder.Locks = nil

	if len(willLock) == 0 {
		return nil
	}

	newReq := types.LockRequest{
		Locks: willLock,
	}

	m, err := r.p.Acquire(newReq, opt)
	if err != nil {
		return err
	}

	r.reqs = append(r.reqs, newReq)
	r.locked = append(r.locked, m)

	return nil
}

func (r *Reentrant) Unlock() {
	for i := len(r.reqs) - 1; i >= 0; i-- {
		r.p.Release(r.locked[i].ReqID)
	}
	r.locked = nil
	r.reqs = nil
}