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package en
import (
"regexp"
"strconv"
"strings"
"time"
"github.com/AlekSi/pointer"
"github.com/olebedev/when/rules"
"github.com/pkg/errors"
)
func PastTime(s rules.Strategy) rules.Rule {
overwrite := s == rules.Override
return &rules.F{
RegExp: regexp.MustCompile(
"(?i)(?:\\W|^)\\s*" +
"(" + INTEGER_WORDS_PATTERN + "|[0-9]+|an?(?:\\s*few)?|half(?:\\s*an?)?)\\s*" +
"(seconds?|min(?:ute)?s?|hours?|days?|weeks?|months?|years?) (ago)\\s*" +
"(?:\\W|$)"),
Applier: func(m *rules.Match, c *rules.Context, o *rules.Options, ref time.Time) (bool, error) {
numStr := strings.TrimSpace(m.Captures[0])
var num int
var err error
if n, ok := INTEGER_WORDS[numStr]; ok {
num = n
} else if numStr == "a" || numStr == "an" {
num = 1
} else if strings.Contains(numStr, "few") {
num = 3
} else if strings.Contains(numStr, "half") {
// pass
} else {
num, err = strconv.Atoi(numStr)
if err != nil {
return false, errors.Wrapf(err, "convert '%s' to int", numStr)
}
}
exponent := strings.TrimSpace(m.Captures[1])
if !strings.Contains(numStr, "half") {
switch {
case strings.Contains(exponent, "second"):
if c.Duration == 0 || overwrite {
c.Duration = -(time.Duration(num) * time.Second)
}
case strings.Contains(exponent, "min"):
if c.Duration == 0 || overwrite {
c.Duration = -(time.Duration(num) * time.Minute)
}
case strings.Contains(exponent, "hour"):
if c.Duration == 0 || overwrite {
c.Duration = -(time.Duration(num) * time.Hour)
}
case strings.Contains(exponent, "day"):
if c.Duration == 0 || overwrite {
c.Duration = -(time.Duration(num) * 24 * time.Hour)
}
case strings.Contains(exponent, "week"):
if c.Duration == 0 || overwrite {
c.Duration = -(time.Duration(num) * 7 * 24 * time.Hour)
}
case strings.Contains(exponent, "month"):
if c.Month == nil || overwrite {
c.Month = pointer.ToInt((int(ref.Month()) - num) % 12)
}
case strings.Contains(exponent, "year"):
if c.Year == nil || overwrite {
c.Year = pointer.ToInt(ref.Year() - num)
}
}
} else {
switch {
case strings.Contains(exponent, "hour"):
if c.Duration == 0 || overwrite {
c.Duration = -(30 * time.Minute)
}
case strings.Contains(exponent, "day"):
if c.Duration == 0 || overwrite {
c.Duration = -(12 * time.Hour)
}
case strings.Contains(exponent, "week"):
if c.Duration == 0 || overwrite {
c.Duration = -(7 * 12 * time.Hour)
}
case strings.Contains(exponent, "month"):
if c.Duration == 0 || overwrite {
// 2 weeks
c.Duration = -(14 * 24 * time.Hour)
}
case strings.Contains(exponent, "year"):
if c.Month == nil || overwrite {
c.Month = pointer.ToInt((int(ref.Month()) - 6) % 12)
}
}
}
return true, nil
},
}
}
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