package curl2info

import (
	"container/heap"
)

// parseQueue for Heap, Container List
type parseQueue []*parseFunction

// parseFunction 优先执行参数
type parseFunction struct {
	ExecuteFunction func(u *CURL, soption string)
	ParamCURL       *CURL
	ParamData       string
	Priority        int
}

// Execute 执行 函数
func (pf *parseFunction) Execute() {
	pf.ExecuteFunction(pf.ParamCURL, pf.ParamData)
}

// Swap 实现sort.Iterface
func (nodes *parseQueue) Swap(i, j int) {
	ns := *nodes
	ns[i], ns[j] = ns[j], ns[i]
}

// Less Priority Want Less
func (nodes *parseQueue) Less(i, j int) bool {
	ns := *nodes
	return ns[i].Priority < ns[j].Priority
}

// Push 实现heap.Interface接口定义的额外方法
func (nodes *parseQueue) Push(exec interface{}) {
	*nodes = append(*nodes, exec.(*parseFunction))
}

// Pop 堆顶
func (nodes *parseQueue) Pop() (exec interface{}) {
	nlen := nodes.Len()
	exec = (*nodes)[nlen-1]    // 返回删除的元素
	*nodes = (*nodes)[:nlen-1] // [n:m]不包括下标为m的元素
	return exec
}

// Len len(nodes)
func (nodes *parseQueue) Len() int {
	return len(*nodes)
}

// pQueueExecute 优先函数队列
type pQueueExecute struct {
	nodes parseQueue
}

// newPQueueExecute Create A pQueueExecute
func newPQueueExecute() *pQueueExecute {
	pe := &pQueueExecute{}
	pe.nodes = make(parseQueue, 0)
	heap.Init(&pe.nodes)
	return pe
}

// Push Create A pQueueExecute
func (pqe *pQueueExecute) Push(exec *parseFunction) {
	heap.Push(&pqe.nodes, exec)
}

// Pop Create A pQueueExecute
func (pqe *pQueueExecute) Pop() *parseFunction {
	return heap.Pop(&pqe.nodes).(*parseFunction)
}

// Len Create A pQueueExecute
func (pqe *pQueueExecute) Len() int {
	return pqe.nodes.Len()
}

// func (pqe *pQueueExecute) String() string {
// 	content := ""
// 	for _, node := range pqe.nodes {
// 		content += strconv.Itoa(node.Prioty)
// 		content += " "
// 	}
// 	return content
// }