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// Copyright 2024 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
package coveragedb
import (
"errors"
"fmt"
"slices"
"sort"
"cloud.google.com/go/civil"
)
type TimePeriod struct {
DateTo civil.Date
Days int
Type string // DayPeriod, MonthPeriod, QuarterPeriod.
}
// DatesFromTo returns the closed range [fromDate, toDate].
func (tp *TimePeriod) DatesFromTo() (civil.Date, civil.Date) {
return tp.DateTo.AddDays(-tp.Days + 1), tp.DateTo
}
func MakeTimePeriod(targetDate civil.Date, periodType string) (TimePeriod, error) {
pOps, err := PeriodOps(periodType)
if err != nil {
return TimePeriod{}, err
}
tp := TimePeriod{DateTo: targetDate, Days: pOps.pointedPeriodDays(targetDate), Type: periodType}
if !pOps.IsValidPeriod(tp) {
return TimePeriod{}, fmt.Errorf("date %s doesn't point the period(%s) end", targetDate.String(), periodType)
}
return tp, nil
}
const (
DayPeriod = "day"
MonthPeriod = "month"
QuarterPeriod = "quarter"
)
var AllPeriods = []string{DayPeriod, MonthPeriod, QuarterPeriod}
var errUnknownTimePeriodType = errors.New("unknown time period type")
func MinMaxDays(periodType string) (int, int, error) {
switch periodType {
case DayPeriod:
return 1, 1, nil
case MonthPeriod:
return 28, 31, nil
case QuarterPeriod:
return 31 + 28 + 31, 31 + 30 + 31, nil
default:
return 0, 0, errUnknownTimePeriodType
}
}
func PeriodOps(periodType string) (periodOps, error) {
switch periodType {
case DayPeriod:
return &DayPeriodOps{}, nil
case MonthPeriod:
return &MonthPeriodOps{}, nil
case QuarterPeriod:
return &QuarterPeriodOps{}, nil
default:
return nil, errUnknownTimePeriodType
}
}
type periodOps interface {
IsValidPeriod(p TimePeriod) bool
lastPeriodDate(d civil.Date) civil.Date
pointedPeriodDays(d civil.Date) int
}
func GenNPeriodsTill(n int, d civil.Date, periodType string) ([]TimePeriod, error) {
pOps, err := PeriodOps(periodType)
if err != nil {
return nil, err
}
var res []TimePeriod
for i := 0; i < n; i++ {
d = pOps.lastPeriodDate(d)
res = append(res, TimePeriod{DateTo: d, Days: pOps.pointedPeriodDays(d), Type: periodType})
d = d.AddDays(-pOps.pointedPeriodDays(d))
}
slices.Reverse(res)
return res, nil
}
type DayPeriodOps struct{}
func (dpo *DayPeriodOps) lastPeriodDate(d civil.Date) civil.Date {
return d
}
func (dpo *DayPeriodOps) IsValidPeriod(p TimePeriod) bool {
return p.Days == 1
}
func (dpo *DayPeriodOps) pointedPeriodDays(d civil.Date) int {
return 1
}
type MonthPeriodOps struct{}
func (m *MonthPeriodOps) lastPeriodDate(d civil.Date) civil.Date {
d.Day = 1
d = d.AddDays(32)
d.Day = 1
return d.AddDays(-1)
}
func (m *MonthPeriodOps) IsValidPeriod(p TimePeriod) bool {
lmd := m.lastPeriodDate(p.DateTo)
return lmd == p.DateTo && p.Days == lmd.Day
}
func (m *MonthPeriodOps) pointedPeriodDays(d civil.Date) int {
return m.lastPeriodDate(d).Day
}
type QuarterPeriodOps struct{}
func (q *QuarterPeriodOps) IsValidPeriod(p TimePeriod) bool {
lmd := q.lastPeriodDate(p.DateTo)
return lmd == p.DateTo && p.Days == q.pointedPeriodDays(lmd)
}
func (q *QuarterPeriodOps) lastPeriodDate(d civil.Date) civil.Date {
d.Month = ((d.Month-1)/3)*3 + 3
d.Day = 1
return (&MonthPeriodOps{}).lastPeriodDate(d)
}
func (q *QuarterPeriodOps) pointedPeriodDays(d civil.Date) int {
d = q.lastPeriodDate(d)
d.Day = 1
res := 0
for i := 0; i < 3; i++ {
res += (&MonthPeriodOps{}).pointedPeriodDays(d)
d.Month--
}
return res
}
func PeriodsToMerge(srcDates, mergedPeriods []TimePeriod, srcRows, mergedRows []int64, ops periodOps) []TimePeriod {
periodRows := map[civil.Date]int64{}
for i, srcDate := range srcDates {
periodID := ops.lastPeriodDate(srcDate.DateTo)
periodRows[periodID] += srcRows[i]
}
for i, period := range mergedPeriods {
if !ops.IsValidPeriod(period) {
continue
}
mergerPeriodID := period.DateTo
if rowsAvailable, ok := periodRows[mergerPeriodID]; ok && rowsAvailable == mergedRows[i] {
delete(periodRows, mergerPeriodID)
}
}
periods := []TimePeriod{}
for periodEndDate := range periodRows {
periods = append(periods,
TimePeriod{DateTo: periodEndDate, Days: ops.pointedPeriodDays(periodEndDate)})
}
sort.Slice(periods, func(i, j int) bool {
return periods[i].DateTo.After(periods[j].DateTo)
})
return periods
}
func AtMostNLatestPeriods(periods []TimePeriod, n int) []TimePeriod {
sort.Slice(periods, func(i, j int) bool {
return periods[i].DateTo.After(periods[j].DateTo)
})
if len(periods) <= n {
return periods
}
return periods[:n]
}
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