package cronFormat

import (
	"strings"

	cherryError "github.com/cherry-game/cherry/error"
	cherryString "github.com/cherry-game/cherry/extend/string"
	"github.com/spf13/cast"
)

const (
	questionMarkChar = "?"
	asteriskChar     = "*"
	hyphenChar       = "-"
	commaChar        = ","
	slashChar        = "/"
	colonChar        = ":"
)

func getSpecHour(spec string) (int32, int32, error) {
	strSplit := strings.Split(spec, hyphenChar)
	if len(strSplit) != 2 {
		return 0, 0, cherryError.Errorf("parse error! [value = %s]", spec)
	}

	var (
		starOK       bool
		endOK        bool
		startSeconds int32
		endSeconds   int32
	)

	startSeconds, starOK = toSeconds(strSplit[0])
	endSeconds, endOK = toSeconds(strSplit[1])
	if !starOK || !endOK {
		return 0, 0, cherryError.Errorf("parse error! [value = %s]", spec)
	}

	return startSeconds, endSeconds, nil
}

func toSeconds(specHour string) (int32, bool) {
	strSplit := strings.Split(specHour, colonChar)
	if len(strSplit) != 2 {
		return 0, false
	}

	hour, ok := cherryString.ToInt(strSplit[0])
	if !ok {
		return 0, false
	}

	if !hours.inRange(hour) {
		return 0, false
	}

	minute, ok := cherryString.ToInt(strSplit[1])
	if !ok {
		return 0, false
	}

	if !minutes.inRange(minute) {
		return 0, false
	}

	return int32((hour*60 + minute) * 60), true
}

func getSpec(spec string, b bounds) ([]int, error) {
	val, ok := isValue(spec, b)
	if ok {
		return val, nil
	}

	val, ok = isQuestionMark(spec, b)
	if ok {
		return val, nil
	}

	val, ok = isAsterisk(spec, b)
	if ok {
		return val, nil
	}

	val, ok = isHyphen(spec, b)
	if ok {
		return val, nil
	}

	val, ok = isComma(spec, b)
	if ok {
		return val, nil
	}

	val, ok = isSlash(spec, b)
	if ok {
		return val, nil
	}

	err := cherryError.Errorf("parse error! [value = %s]", spec)
	return nil, err
}

// isValue 解析 正常值格式
func isValue(str string, b bounds) ([]int, bool) {
	intValue, ok := cherryString.ToInt(str)
	if !ok {
		return nil, false
	}

	if !b.inRange(intValue) {
		return nil, false
	}

	return []int{intValue}, true
}

// isQuestionMark 解析 ? 格式
func isQuestionMark(str string, _ bounds) ([]int, bool) {
	if str == questionMarkChar {
		return []int{}, true
	}
	return nil, false
}

// isAsterisk 解析 * 格式
func isAsterisk(str string, b bounds) ([]int, bool) {
	if str == asteriskChar {
		return b.all, true
	}

	return nil, false
}

// isHyphen 解析 - 格式
func isHyphen(str string, b bounds) ([]int, bool) {
	if !strings.Contains(str, hyphenChar) {
		return nil, false
	}

	strSplit := strings.Split(str, hyphenChar)
	if len(strSplit) != 2 {
		return nil, false
	}

	start, e1 := cast.ToIntE(strSplit[0])
	end, e2 := cast.ToIntE(strSplit[1])
	if e1 != nil || e2 != nil {
		return nil, false
	}

	if start > end {
		return nil, false
	}

	if !b.inRange(start) {
		return nil, false
	}

	if !b.inRange(end) {
		return nil, false
	}

	var values []int
	for i := start; i <= end; i++ {
		values = append(values, i)
	}

	return values, true
}

// isComma 解析 , 格式
func isComma(str string, b bounds) ([]int, bool) {
	if !strings.Contains(str, commaChar) {
		return nil, false
	}

	strSplit := strings.Split(str, commaChar)
	if len(strSplit) < 1 {
		return nil, false
	}

	var values []int

	for _, s := range strSplit {
		v, err := cast.ToIntE(s)
		if err != nil {
			return nil, false
		}

		if !b.inRange(v) {
			return nil, false
		}

		values = append(values, v)
	}

	return values, true
}

// isSlash 解析 / 格式
func isSlash(str string, b bounds) ([]int, bool) {
	if !strings.Contains(str, slashChar) {
		return nil, false
	}

	strSplit := strings.Split(str, slashChar)
	if len(strSplit) != 2 {
		return nil, false
	}

	var values []int

	for _, s := range strSplit {
		v, err := cast.ToIntE(s)
		if err != nil {
			return nil, false
		}

		if !b.inRange(v) {
			return nil, false
		}

		values = append(values, v)
	}

	return values, true
}