package internal

import (
	"bufio"
	"bytes"
	"errors"
	"fmt"
	"github.com/antonmedv/expr"
	"github.com/chainreactors/files"
	"github.com/chainreactors/logs"
	"github.com/chainreactors/parsers"
	"github.com/chainreactors/spray/internal/ihttp"
	"github.com/chainreactors/spray/internal/pool"
	"github.com/chainreactors/spray/pkg"
	"github.com/chainreactors/utils"
	"github.com/chainreactors/utils/iutils"
	"github.com/chainreactors/words/mask"
	"github.com/chainreactors/words/rule"
	"github.com/vbauerster/mpb/v8"
	"io/ioutil"
	"net/http"
	"net/url"
	"os"
	"path/filepath"
	"regexp"
	"strconv"
	"strings"
	"sync"
	"time"
)

var (
	DefaultThreads = 20
	SkipChar       = "%SKIP%"
)

type Option struct {
	InputOptions    `group:"Input Options" config:"input" `
	FunctionOptions `group:"Function Options" config:"functions" `
	OutputOptions   `group:"Output Options" config:"output"`
	PluginOptions   `group:"Plugin Options" config:"plugins"`
	RequestOptions  `group:"Request Options" config:"request"`
	ModeOptions     `group:"Modify Options" config:"mode"`
	MiscOptions     `group:"Miscellaneous Options" config:"misc"`
}

type InputOptions struct {
	ResumeFrom   string   `long:"resume" description:"File, resume filename" `
	Config       string   `short:"c" long:"config" description:"File, config filename"`
	URL          []string `short:"u" long:"url" description:"Strings, input baseurl, e.g.: http://google.com"`
	URLFile      string   `short:"l" long:"list" description:"File, input filename"`
	PortRange    string   `short:"p" long:"port" description:"String, input port range, e.g.: 80,8080-8090,db"`
	CIDRs        string   `long:"cidr" description:"String, input cidr, e.g.: 1.1.1.1/24 "`
	RawFile      string   `long:"raw" description:"File, input raw request filename"`
	Dictionaries []string `short:"d" long:"dict" description:"Files, Multi,dict files, e.g.: -d 1.txt -d 2.txt" config:"dictionaries"`
	NoDict       bool     `long:"no-dict" description:"Bool, no dictionary" config:"no-dict"`
	Word         string   `short:"w" long:"word" description:"String, word generate dsl, e.g.: -w test{?ld#4}" config:"word"`
	Rules        []string `short:"r" long:"rules" description:"Files, rule files, e.g.: -r rule1.txt -r rule2.txt" config:"rules"`
	AppendRule   []string `long:"append-rule" description:"Files, when found valid path , use append rule generator new word with current path" config:"append-rules"`
	FilterRule   string   `long:"filter-rule" description:"String, filter rule, e.g.: --rule-filter '>8 <4'" config:"filter-rule"`
	AppendFile   []string `long:"append-file" description:"Files, when found valid path , use append file new word with current path" config:"append-files"`
	Offset       int      `long:"offset" description:"Int, wordlist offset"`
	Limit        int      `long:"limit" description:"Int, wordlist limit, start with offset. e.g.: --offset 1000 --limit 100"`
}

type FunctionOptions struct {
	Extensions        string            `short:"e" long:"extension" description:"String, add extensions (separated by commas), e.g.: -e jsp,jspx" config:"extension"`
	ForceExtension    bool              `long:"force-extension" description:"Bool, force add extensions" config:"force-extension"`
	ExcludeExtensions string            `long:"exclude-extension" description:"String, exclude extensions (separated by commas), e.g.: --exclude-extension jsp,jspx" config:"exclude-extension"`
	RemoveExtensions  string            `long:"remove-extension" description:"String, remove extensions (separated by commas), e.g.: --remove-extension jsp,jspx" config:"remove-extension"`
	Uppercase         bool              `short:"U" long:"uppercase" description:"Bool, upper wordlist, e.g.: --uppercase" config:"upper"`
	Lowercase         bool              `short:"L" long:"lowercase" description:"Bool, lower wordlist, e.g.: --lowercase" config:"lower"`
	Prefixes          []string          `long:"prefix" description:"Strings, add prefix, e.g.: --prefix aaa --prefix bbb" config:"prefix"`
	Suffixes          []string          `long:"suffix" description:"Strings, add suffix, e.g.: --suffix aaa --suffix bbb" config:"suffix"`
	Replaces          map[string]string `long:"replace" description:"Strings, replace string, e.g.: --replace aaa:bbb --replace ccc:ddd" config:"replace"`
	Skips             []string          `long:"skip" description:"String, skip word when generate. rule, e.g.: --skip aaa" config:"skip"`
	//SkipEval          string            `long:"skip-eval" description:"String, skip word when generate. rule, e.g.: --skip-eval 'current.Length < 4'"`
}

type OutputOptions struct {
	Match       string `long:"match" description:"String, custom match function, e.g.: --match 'current.Status != 200''" config:"match" `
	Filter      string `long:"filter" description:"String, custom filter function, e.g.: --filter 'current.Body contains \"hello\"'" config:"filter"`
	Fuzzy       bool   `long:"fuzzy" description:"String, open fuzzy output" config:"fuzzy"`
	OutputFile  string `short:"f" long:"file" description:"String, output filename" json:"output_file,omitempty" config:"output-file"`
	FuzzyFile   string `long:"fuzzy-file" description:"String, fuzzy output filename" json:"fuzzy_file,omitempty" config:"fuzzy-file"`
	DumpFile    string `long:"dump-file" description:"String, dump all request, and write to filename" config:"dump-file"`
	Dump        bool   `long:"dump" description:"Bool, dump all request" config:"dump"`
	AutoFile    bool   `long:"auto-file" description:"Bool, auto generator output and fuzzy filename" config:"auto-file"`
	Format      string `short:"F" long:"format" description:"String, output format, e.g.: --format 1.json" config:"format"`
	OutputProbe string `short:"o" long:"probe" description:"String, output format" config:"output_probe"`
	Quiet       bool   `short:"q" long:"quiet" description:"Bool, Quiet" config:"quiet"`
	NoColor     bool   `long:"no-color" description:"Bool, no color" config:"no-color"`
	NoBar       bool   `long:"no-bar" description:"Bool, No progress bar" config:"no-bar"`
}

type RequestOptions struct {
	Method          string   `short:"x" long:"method" default:"GET" description:"String, request method, e.g.: --method POST" config:"method"`
	Headers         []string `long:"header" description:"Strings, custom headers, e.g.: --headers 'Auth: example_auth'" config:"headers"`
	UserAgent       string   `long:"user-agent" description:"String, custom user-agent, e.g.: --user-agent Custom" config:"useragent"`
	RandomUserAgent bool     `long:"random-agent" description:"Bool, use random with default user-agent" config:"random-useragent"`
	Cookie          []string `long:"cookie" description:"Strings, custom cookie" config:"cookies"`
	ReadAll         bool     `long:"read-all" description:"Bool, read all response body" config:"read-all"`
	MaxBodyLength   int64    `long:"max-length" default:"100" description:"Int, max response body length (kb), -1 read-all, 0 not read body, default 100k, e.g. --max-length 1000" config:"max-length"`
}

type PluginOptions struct {
	Advance       bool     `short:"a" long:"advance" description:"Bool, enable all plugin" config:"all" `
	Extracts      []string `long:"extract" description:"Strings, extract response, e.g.: --extract js --extract ip --extract version:(.*?)" config:"extract"`
	ExtractConfig string   `long:"extract-config" description:"String, extract config filename" config:"extract-config"`
	Recon         bool     `long:"recon" description:"Bool, enable recon" config:"recon"`
	Finger        bool     `long:"finger" description:"Bool, enable active finger detect" config:"finger"`
	Bak           bool     `long:"bak" description:"Bool, enable bak found" config:"bak"`
	FileBak       bool     `long:"file-bak" description:"Bool, enable valid result bak found, equal --append-rule rule/filebak.txt" config:"file-bak"`
	Common        bool     `long:"common" description:"Bool, enable common file found" config:"common"`
	Crawl         bool     `long:"crawl" description:"Bool, enable crawl" config:"crawl"`
	CrawlDepth    int      `long:"crawl-depth" default:"3" description:"Int, crawl depth" config:"crawl-depth"`
}

type ModeOptions struct {
	RateLimit       int      `long:"rate-limit" default:"0" description:"Int, request rate limit (rate/s), e.g.: --rate-limit 100" config:"rate-limit"`
	Force           bool     `long:"force" description:"Bool, skip error break" config:"force"`
	CheckOnly       bool     `long:"check-only" description:"Bool, check only" config:"check-only"`
	NoScope         bool     `long:"no-scope" description:"Bool, no scope" config:"no-scope"`
	Scope           []string `long:"scope" description:"String, custom scope, e.g.: --scope *.example.com" config:"scope"`
	Recursive       string   `long:"recursive" default:"current.IsDir()" description:"String,custom recursive rule, e.g.: --recursive current.IsDir()" config:"recursive"`
	Depth           int      `long:"depth" default:"0" description:"Int, recursive depth" config:"depth"`
	Index           string   `long:"index" default:"/" description:"String, custom index path" config:"index"`
	Random          string   `long:"random" default:"" description:"String, custom random path" config:"random"`
	CheckPeriod     int      `long:"check-period" default:"200" description:"Int, check period when request" config:"check-period"`
	ErrPeriod       int      `long:"error-period" default:"10" description:"Int, check period when error" config:"error-period"`
	BreakThreshold  int      `long:"error-threshold" default:"20" description:"Int, break when the error exceeds the threshold" config:"error-threshold"`
	BlackStatus     string   `long:"black-status" default:"400,410" description:"Strings (comma split),custom black status" config:"black-status"`
	WhiteStatus     string   `long:"white-status" default:"200" description:"Strings (comma split), custom white status" config:"white-status"`
	FuzzyStatus     string   `long:"fuzzy-status" default:"500,501,502,503" description:"Strings (comma split), custom fuzzy status" config:"fuzzy-status"`
	UniqueStatus    string   `long:"unique-status" default:"403,200,404" description:"Strings (comma split), custom unique status" config:"unique-status"`
	Unique          bool     `long:"unique" description:"Bool, unique response" config:"unique"`
	RetryCount      int      `long:"retry" default:"0" description:"Int, retry count" config:"retry"`
	SimhashDistance int      `long:"distance" default:"5" config:"distance"`
}

type MiscOptions struct {
	Mod        string `short:"m" long:"mod" default:"path" choice:"path" choice:"host" description:"String, path/host spray" config:"mod"`
	Client     string `short:"C" long:"client" default:"auto" choice:"fast" choice:"standard" choice:"auto" description:"String, Client type" config:"client"`
	Deadline   int    `long:"deadline" default:"999999" description:"Int, deadline (seconds)" config:"deadline"` // todo 总的超时时间,适配云函数的deadline
	Timeout    int    `long:"timeout" default:"5" description:"Int, timeout with request (seconds)" config:"timeout"`
	PoolSize   int    `short:"P" long:"pool" default:"5" description:"Int, Pool size" config:"pool"`
	Threads    int    `short:"t" long:"thread" default:"20" description:"Int, number of threads per pool" config:"thread"`
	Debug      bool   `long:"debug" description:"Bool, output debug info" config:"debug"`
	Version    bool   `long:"version" description:"Bool, show version"`
	Verbose    []bool `short:"v" description:"Bool, log verbose level ,default 0, level1: -v level2 -vv " config:"verbose"`
	Proxy      string `long:"proxy" description:"String, proxy address, e.g.: --proxy socks5://127.0.0.1:1080" config:"proxy"`
	InitConfig bool   `long:"init" description:"Bool, init config file"`
}

func (opt *Option) PrepareRunner() (*Runner, error) {
	err := opt.Validate()
	if err != nil {
		return nil, err
	}
	r := &Runner{
		Threads:         opt.Threads,
		PoolSize:        opt.PoolSize,
		Mod:             opt.Mod,
		Timeout:         opt.Timeout,
		RateLimit:       opt.RateLimit,
		Deadline:        opt.Deadline,
		Headers:         make(map[string]string),
		Method:          opt.Method,
		Offset:          opt.Offset,
		Total:           opt.Limit,
		taskCh:          make(chan *Task),
		outputCh:        make(chan *pkg.Baseline, 100),
		outwg:           &sync.WaitGroup{},
		fuzzyCh:         make(chan *pkg.Baseline, 100),
		Fuzzy:           opt.Fuzzy,
		Force:           opt.Force,
		CheckOnly:       opt.CheckOnly,
		CheckPeriod:     opt.CheckPeriod,
		ErrPeriod:       opt.ErrPeriod,
		BreakThreshold:  opt.BreakThreshold,
		Crawl:           opt.Crawl,
		Scope:           opt.Scope,
		Finger:          opt.Finger,
		Bak:             opt.Bak,
		Common:          opt.Common,
		RetryCount:      opt.RetryCount,
		RandomUserAgent: opt.RandomUserAgent,
		Random:          opt.Random,
		Index:           opt.Index,
		Proxy:           opt.Proxy,
	}

	// log and bar
	if !opt.NoColor {
		logs.Log.SetColor(true)
		r.Color = true
	}
	if opt.Quiet {
		logs.Log.SetQuiet(true)
		logs.Log.SetColor(false)
		r.Color = false
	}
	if !(opt.Quiet || opt.NoBar) {
		r.Progress = mpb.New(mpb.WithRefreshRate(100 * time.Millisecond))
		logs.Log.SetOutput(r.Progress)
	}

	// configuration
	if opt.Force {
		// 如果开启了force模式, 将关闭check机制, err积累到一定数量自动退出机制
		r.BreakThreshold = MAX
		r.CheckPeriod = MAX
		r.ErrPeriod = MAX
	}

	// 选择client
	if opt.Client == "auto" {
		r.ClientType = ihttp.Auto
	} else if opt.Client == "fast" {
		r.ClientType = ihttp.FAST
	} else if opt.Client == "standard" || opt.Client == "base" || opt.Client == "http" {
		r.ClientType = ihttp.STANDARD
	}

	if opt.Threads == DefaultThreads && opt.CheckOnly {
		r.Threads = 1000
	}

	if opt.Extracts != nil {
		for _, e := range opt.Extracts {
			if reg, ok := pkg.ExtractRegexps[e]; ok {
				pkg.Extractors[e] = reg
			} else {
				pkg.Extractors[e] = []*parsers.Extractor{
					&parsers.Extractor{
						Name:            e,
						CompiledRegexps: []*regexp.Regexp{regexp.MustCompile(e)},
					},
				}
			}
		}
	}
	if opt.ExtractConfig != "" {
		extracts, err := pkg.LoadExtractorConfig(opt.ExtractConfig)
		if err != nil {
			return nil, err
		}
		pkg.Extractors[opt.ExtractConfig] = extracts
	}

	if opt.Recon {
		pkg.Extractors["recon"] = pkg.ExtractRegexps["pentest"]
	}

	if opt.Advance {
		r.Crawl = true
		r.Finger = true
		r.Bak = true
		r.Common = true
		pkg.EnableAllFingerEngine = true
		pkg.Extractors["recon"] = pkg.ExtractRegexps["pentest"]
		opt.AppendRule = append(opt.AppendRule, "filebak")
	} else if opt.FileBak {
		opt.AppendRule = append(opt.AppendRule, "filebak")
	}

	var s strings.Builder
	if r.Crawl {
		s.WriteString("crawl enable; ")
	}
	if r.Finger {
		r.AppendWords = append(r.AppendWords, pkg.ActivePath...)
		pkg.EnableAllFingerEngine = true
		s.WriteString("active fingerprint enable; ")
	}
	if r.Bak {
		s.WriteString("bak file enable; ")
	}
	if r.Common {
		r.AppendWords = append(r.AppendWords, mask.SpecialWords["common_file"]...)
		s.WriteString("common file enable; ")
	}
	if opt.Recon {
		s.WriteString("recon enable; ")
	}
	if len(opt.AppendRule) > 0 {
		s.WriteString("file bak enable; ")
	}

	if r.RetryCount > 0 {
		s.WriteString("Retry Count: " + strconv.Itoa(r.RetryCount))
	}
	if s.Len() > 0 {
		logs.Log.Important(s.String())
	}

	if opt.NoScope {
		r.Scope = []string{"*"}
	}

	pkg.BlackStatus = parseStatus(pkg.BlackStatus, opt.BlackStatus)
	pkg.WhiteStatus = parseStatus(pkg.WhiteStatus, opt.WhiteStatus)
	if opt.FuzzyStatus == "all" {
		pool.EnableAllFuzzy = true
	} else {
		pkg.FuzzyStatus = parseStatus(pkg.FuzzyStatus, opt.FuzzyStatus)
	}

	if opt.Unique {
		pool.EnableAllUnique = true
	} else {
		pkg.UniqueStatus = parseStatus(pkg.UniqueStatus, opt.UniqueStatus)
	}

	// prepare word
	dicts := make([][]string, len(opt.Dictionaries))
	if len(opt.Dictionaries) == 0 && opt.Word == "" && !opt.NoDict {
		dicts = append(dicts, pkg.LoadDefaultDict())
		logs.Log.Warn("not set any dictionary, use default dictionary: https://github.com/maurosoria/dirsearch/blob/master/db/dicc.txt")
	} else {
		for i, f := range opt.Dictionaries {
			dicts[i], err = loadFileToSlice(f)
			if opt.ResumeFrom != "" {
				dictCache[f] = dicts[i]
			}
			if err != nil {
				return nil, err
			}

			logs.Log.Logf(pkg.LogVerbose, "Loaded %d word from %s", len(dicts[i]), f)
		}
	}

	if opt.Word == "" {
		opt.Word = "{?"
		for i, _ := range dicts {
			opt.Word += strconv.Itoa(i)
		}
		opt.Word += "}"
	}

	if len(opt.Suffixes) != 0 {
		mask.SpecialWords["suffix"] = opt.Suffixes
		opt.Word += "{@suffix}"
	}
	if len(opt.Prefixes) != 0 {
		mask.SpecialWords["prefix"] = opt.Prefixes
		opt.Word = "{@prefix}" + opt.Word
	}

	if opt.ForceExtension && opt.Extensions != "" {
		exts := strings.Split(opt.Extensions, ",")
		for i, e := range exts {
			if !strings.HasPrefix(e, ".") {
				exts[i] = "." + e
			}
		}
		mask.SpecialWords["ext"] = exts
		opt.Word += "{@ext}"
	}

	r.Wordlist, err = mask.Run(opt.Word, dicts, nil)
	if err != nil {
		return nil, fmt.Errorf("%s %w", opt.Word, err)
	}
	if len(r.Wordlist) > 0 {
		logs.Log.Logf(pkg.LogVerbose, "Parsed %d words by %s", len(r.Wordlist), opt.Word)
	}

	if len(opt.Rules) != 0 {
		rules, err := loadRuleAndCombine(opt.Rules)
		if err != nil {
			return nil, err
		}
		r.Rules = rule.Compile(rules, opt.FilterRule)
	} else if opt.FilterRule != "" {
		// if filter rule is not empty, set rules to ":", force to open filter mode
		r.Rules = rule.Compile(":", opt.FilterRule)
	} else {
		r.Rules = new(rule.Program)
	}

	if len(r.Rules.Expressions) > 0 {
		r.Total = len(r.Wordlist) * len(r.Rules.Expressions)
	} else {
		r.Total = len(r.Wordlist)
	}

	pkg.DefaultStatistor = pkg.Statistor{
		Word:         opt.Word,
		WordCount:    len(r.Wordlist),
		Dictionaries: opt.Dictionaries,
		Offset:       opt.Offset,
		RuleFiles:    opt.Rules,
		RuleFilter:   opt.FilterRule,
		Total:        r.Total,
	}

	if len(opt.AppendRule) != 0 {
		content, err := loadRuleAndCombine(opt.AppendRule)
		if err != nil {
			return nil, err
		}
		r.AppendRules = rule.Compile(string(content), "")
	}

	if len(opt.AppendFile) != 0 {
		var bs bytes.Buffer
		for _, f := range opt.AppendFile {
			content, err := ioutil.ReadFile(f)
			if err != nil {
				return nil, err
			}
			bs.Write(bytes.TrimSpace(content))
			bs.WriteString("\n")
		}
		lines := strings.Split(bs.String(), "\n")
		for i, line := range lines {
			lines[i] = strings.TrimSpace(line)
		}
		r.AppendWords = append(r.AppendWords, lines...)
	}

	ports := utils.ParsePort(opt.PortRange)
	// prepare task
	tasks := make(chan *Task, opt.PoolSize)
	var taskfrom string
	if opt.ResumeFrom != "" {
		stats, err := pkg.ReadStatistors(opt.ResumeFrom)
		if err != nil {
			logs.Log.Error(err.Error())
		}
		r.Count = len(stats)
		taskfrom = "resume " + opt.ResumeFrom
		go func() {
			for _, stat := range stats {
				tasks <- &Task{baseUrl: stat.BaseUrl, origin: NewOrigin(stat)}
			}
			close(tasks)
		}()
	} else {
		var file *os.File

		// 根据不同的输入类型生成任务
		if len(opt.URL) == 1 {
			u, err := url.Parse(opt.URL[0])
			if err != nil {
				u, _ = url.Parse("http://" + opt.URL[0])
			}
			go func() {
				opt.GenerateTasks(tasks, u.String(), ports)
				close(tasks)
			}()
			taskfrom = u.Host
			r.Count = 1
		} else if len(opt.URL) > 1 {
			go func() {
				for _, u := range opt.URL {
					opt.GenerateTasks(tasks, u, ports)
				}
				close(tasks)
			}()

			taskfrom = "cmd"
			r.Count = len(opt.URL)
		} else if opt.RawFile != "" {
			raw, err := os.Open(opt.RawFile)
			if err != nil {
				return nil, err
			}

			req, err := http.ReadRequest(bufio.NewReader(raw))
			if err != nil {
				return nil, err
			}
			go func() {
				opt.GenerateTasks(tasks, fmt.Sprintf("http://%s%s", req.Host, req.URL.String()), ports)
				close(tasks)
			}()
			r.Method = req.Method
			for k, _ := range req.Header {
				r.Headers[k] = req.Header.Get(k)
			}
		} else if opt.CIDRs != "" {
			if len(ports) == 0 {
				ports = []string{"80", "443"}
			}

			for _, cidr := range strings.Split(opt.CIDRs, ",") {
				ips := utils.ParseCIDR(cidr)
				if ips != nil {
					r.Count += ips.Count()
				}
			}
			go func() {
				for _, cidr := range strings.Split(opt.CIDRs, ",") {
					ips := utils.ParseCIDR(cidr)
					if ips == nil {
						logs.Log.Error("cidr format error: " + cidr)
					}
					for ip := range ips.Range() {
						opt.GenerateTasks(tasks, ip.String(), ports)
					}
				}
				close(tasks)
			}()
			taskfrom = "cidr"
		} else if opt.URLFile != "" {
			file, err = os.Open(opt.URLFile)
			if err != nil {
				return nil, err
			}
			taskfrom = filepath.Base(opt.URLFile)
		} else if files.HasStdin() {
			file = os.Stdin
			taskfrom = "stdin"
		}
		if file != nil {
			content, err := ioutil.ReadAll(file)
			if err != nil {
				return nil, err
			}
			urls := strings.Split(strings.TrimSpace(string(content)), "\n")
			for _, u := range urls {
				u = strings.TrimSpace(u)
				if _, err := url.Parse(u); err == nil {
					r.Count++
				} else if ip := utils.ParseIP(u); ip != nil {
					r.Count++
				} else if cidr := utils.ParseCIDR(u); cidr != nil {
					r.Count += cidr.Count()
				}
			}

			go func() {
				for _, u := range urls {
					u = strings.TrimSpace(u)
					if _, err := url.Parse(u); err == nil {
						opt.GenerateTasks(tasks, u, ports)
					} else if ip := utils.ParseIP(u); ip != nil {
						opt.GenerateTasks(tasks, u, ports)
					} else if cidr := utils.ParseCIDR(u); cidr != nil {
						for ip := range cidr.Range() {
							opt.GenerateTasks(tasks, ip.String(), ports)
						}
					}
				}
				close(tasks)
			}()
		}
	}

	if len(ports) > 0 {
		r.Count = r.Count * len(ports)
	}

	r.Tasks = tasks
	logs.Log.Logf(pkg.LogVerbose, "Loaded %d urls from %s", len(tasks), taskfrom)

	//  类似dirsearch中的
	if opt.Extensions != "" {
		r.AppendFunction(func(s string) []string {
			exts := strings.Split(opt.Extensions, ",")
			ss := make([]string, len(exts))
			for i, e := range exts {
				if strings.Contains(s, "%EXT%") {
					ss[i] = strings.Replace(s, "%EXT%", e, -1)
				}
			}
			return ss
		})
	} else {
		r.AppendFunction(func(s string) []string {
			if strings.Contains(s, "%EXT%") {
				return nil
			}
			return []string{s}
		})
	}

	if opt.Uppercase {
		r.AppendFunction(wrapWordsFunc(strings.ToUpper))
	}
	if opt.Lowercase {
		r.AppendFunction(wrapWordsFunc(strings.ToLower))
	}

	if opt.RemoveExtensions != "" {
		rexts := strings.Split(opt.ExcludeExtensions, ",")
		r.AppendFunction(func(s string) []string {
			if ext := parseExtension(s); iutils.StringsContains(rexts, ext) {
				return []string{strings.TrimSuffix(s, "."+ext)}
			}
			return []string{s}
		})
	}

	if opt.ExcludeExtensions != "" {
		exexts := strings.Split(opt.ExcludeExtensions, ",")
		r.AppendFunction(func(s string) []string {
			if ext := parseExtension(s); iutils.StringsContains(exexts, ext) {
				return nil
			}
			return []string{s}
		})
	}

	if len(opt.Replaces) > 0 {
		r.AppendFunction(func(s string) []string {
			for k, v := range opt.Replaces {
				s = strings.Replace(s, k, v, -1)
			}
			return []string{s}
		})
	}

	// default skip function, skip %EXT%
	r.AppendFunction(func(s string) []string {
		if strings.Contains(s, "%EXT%") {
			return nil
		}
		return []string{s}
	})
	if len(opt.Skips) > 0 {
		r.AppendFunction(func(s string) []string {
			for _, skip := range opt.Skips {
				if strings.Contains(s, skip) {
					return nil
				}
			}
			return []string{s}
		})
	}

	logs.Log.Logf(pkg.LogVerbose, "Loaded %d dictionaries and %d decorators", len(opt.Dictionaries), len(r.Fns))

	if opt.Match != "" {
		exp, err := expr.Compile(opt.Match, expr.Patch(&bytesPatcher{}))
		if err != nil {
			return nil, err
		}
		r.MatchExpr = exp
	}

	if opt.Filter != "" {
		exp, err := expr.Compile(opt.Filter, expr.Patch(&bytesPatcher{}))
		if err != nil {
			return nil, err
		}
		r.FilterExpr = exp
	}

	// 初始化递归
	var express string
	if opt.Recursive != "current.IsDir()" && opt.Depth != 0 {
		// 默认不打开递归, 除非指定了非默认的递归表达式
		pool.MaxRecursion = 1
		express = opt.Recursive
	}

	if opt.Depth != 0 {
		// 手动设置的depth优先级高于默认
		pool.MaxRecursion = opt.Depth
		express = opt.Recursive
	}

	if express != "" {
		exp, err := expr.Compile(express, expr.Patch(&bytesPatcher{}))
		if err != nil {
			return nil, err
		}
		r.RecursiveExpr = exp
	}

	// prepare header
	for _, h := range opt.Headers {
		i := strings.Index(h, ":")
		if i == -1 {
			logs.Log.Warn("invalid header")
		} else {
			r.Headers[h[:i]] = h[i+2:]
		}
	}

	if opt.UserAgent != "" {
		r.Headers["User-Agent"] = opt.UserAgent
	}
	if opt.Cookie != nil {
		r.Headers["Cookie"] = strings.Join(opt.Cookie, "; ")
	}

	if opt.OutputProbe != "" {
		r.Probes = strings.Split(opt.OutputProbe, ",")
	}

	// init output file
	if opt.OutputFile != "" {
		r.OutputFile, err = files.NewFile(opt.OutputFile, false, false, true)
		if err != nil {
			return nil, err
		}
	} else if opt.AutoFile {
		r.OutputFile, err = files.NewFile("result.json", false, false, true)
		if err != nil {
			return nil, err
		}
	}

	if opt.FuzzyFile != "" {
		r.FuzzyFile, err = files.NewFile(opt.FuzzyFile, false, false, true)
		if err != nil {
			return nil, err
		}
	} else if opt.AutoFile {
		r.FuzzyFile, err = files.NewFile("fuzzy.json", false, false, true)
		if err != nil {
			return nil, err
		}
	}

	if opt.DumpFile != "" {
		r.DumpFile, err = files.NewFile(opt.DumpFile, false, false, true)
		if err != nil {
			return nil, err
		}
	} else if opt.Dump {
		r.DumpFile, err = files.NewFile("dump.json", false, false, true)
		if err != nil {
			return nil, err
		}
	}
	if opt.ResumeFrom != "" {
		r.StatFile, err = files.NewFile(opt.ResumeFrom, false, true, true)
	} else {
		r.StatFile, err = files.NewFile(strings.ReplaceAll(taskfrom, ":", "_")+".stat", false, true, true)
	}
	if err != nil {
		return nil, err
	}
	r.StatFile.Mod = os.O_WRONLY | os.O_CREATE
	err = r.StatFile.Init()
	if err != nil {
		return nil, err
	}
	return r, nil
}

func (opt *Option) Validate() error {
	if opt.Uppercase && opt.Lowercase {
		return errors.New("cannot set -U and -L at the same time")
	}

	if (opt.Offset != 0 || opt.Limit != 0) && opt.Depth > 0 {
		// 偏移和上限与递归同时使用时也会造成混淆.
		return errors.New("--offset and --limit cannot be used with --depth at the same time")
	}

	if opt.Depth > 0 && opt.ResumeFrom != "" {
		// 递归与断点续传会造成混淆, 断点续传的word与rule不是通过命令行获取的

		return errors.New("--resume and --depth cannot be used at the same time")
	}

	if opt.ResumeFrom == "" && opt.URL == nil && opt.URLFile == "" && opt.CIDRs == "" && opt.RawFile == "" {
		return fmt.Errorf("without any target, please use -u/-l/-c/--resume to set targets")
	}
	return nil
}

// Generate Tasks
func (opt *Option) GenerateTasks(ch chan *Task, u string, ports []string) {
	parsed, err := url.Parse(u)
	if err != nil {
		logs.Log.Warn(err.Error())
		return
	}

	if parsed.Scheme == "" {
		if parsed.Port() == "443" {
			parsed.Scheme = "https"
		} else {
			parsed.Scheme = "http"
		}
	}

	if len(ports) == 0 {
		ch <- &Task{baseUrl: u}
		return
	}

	for _, p := range ports {
		if parsed.Host == "" {
			ch <- &Task{baseUrl: fmt.Sprintf("%s://%s:%s", parsed.Scheme, parsed.Path, p)}
		} else {
			ch <- &Task{baseUrl: fmt.Sprintf("%s://%s:%s/%s", parsed.Scheme, parsed.Host, p, parsed.Path)}
		}
	}
}