package interceptor

import (
	ctxpkg "github.com/noahlann/nnet/pkg/context"
	interceptorpkg "github.com/noahlann/nnet/pkg/interceptor"
)

// chain 拦截器链实现
type chain struct {
	interceptors []interceptorpkg.Interceptor
	index        int
}

// NewChain 创建拦截器链
func NewChain(interceptors ...interceptorpkg.Interceptor) interceptorpkg.Chain {
	return &chain{
		interceptors: interceptors,
		index:        0,
	}
}

// Next 执行下一个拦截器
func (c *chain) Next(data []byte, ctx ctxpkg.Context) ([]byte, bool, error) {
	if c.index >= len(c.interceptors) {
		// 所有拦截器都执行完毕，返回原始数据
		return data, true, nil
	}

	interceptor := c.interceptors[c.index]
	c.index++

	// 创建新的链用于递归调用
	nextChain := &chain{
		interceptors: c.interceptors,
		index:        c.index,
	}

	return interceptor.Intercept(data, ctx, nextChain)
}

// Execute 执行拦截器链
func Execute(data []byte, ctx ctxpkg.Context, interceptors ...interceptorpkg.Interceptor) ([]byte, bool, error) {
	chain := NewChain(interceptors...)
	return chain.Next(data, ctx)
}