package chore
import (
"encoding/json"
"fmt"
"math"
"math/rand"
"strings"
"time"
chModel "donetick.com/core/internal/chore/model"
)
func scheduleNextDueDate(chore *chModel.Chore, completedDate time.Time) (*time.Time, error) {
// if Chore is rolling then the next due date calculated from the completed date, otherwise it's calculated from the due date
var nextDueDate time.Time
var baseDate time.Time
var frequencyMetadata chModel.FrequencyMetadata
err := json.Unmarshal([]byte(*chore.FrequencyMetadata), &frequencyMetadata)
if err != nil {
return nil, fmt.Errorf("error unmarshalling frequency metadata")
}
if chore.FrequencyType == "once" {
return nil, nil
}
if chore.NextDueDate != nil {
// no due date set, use the current date
baseDate = chore.NextDueDate.UTC()
} else {
baseDate = completedDate.UTC()
}
if chore.FrequencyType == "day_of_the_month" || chore.FrequencyType == "days_of_the_week" || chore.FrequencyType == "interval" {
// time in frequency metadata stored as RFC3339 format like `2024-07-07T13:27:00-04:00`
// parse it to time.Time:
t, err := time.Parse(time.RFC3339, frequencyMetadata.Time)
if err != nil {
return nil, fmt.Errorf("error parsing time in frequency metadata")
}
// set the time to the time in the frequency metadata:
baseDate = time.Date(baseDate.Year(), baseDate.Month(), baseDate.Day(), t.Hour(), t.Minute(), 0, 0, t.Location())
}
if chore.IsRolling && chore.NextDueDate.Before(completedDate) {
// we need to check if chore due date is before the completed date to handle this senario:
// if user trying to complete chore due in future (multiple time for insance) due date will be calculated
// from the last completed date and due date change only in seconds.
// this make sure that the due date is always in future if the chore is rolling
baseDate = completedDate.UTC()
}
if chore.FrequencyType == "daily" {
nextDueDate = baseDate.AddDate(0, 0, 1)
} else if chore.FrequencyType == "weekly" {
nextDueDate = baseDate.AddDate(0, 0, 7)
} else if chore.FrequencyType == "monthly" {
nextDueDate = baseDate.AddDate(0, 1, 0)
} else if chore.FrequencyType == "yearly" {
nextDueDate = baseDate.AddDate(1, 0, 0)
} else if chore.FrequencyType == "adaptive" {
// TODO: calculate next due date based on the history of the chore
// calculate the difference between the due date and now in days:
diff := completedDate.UTC().Sub(chore.NextDueDate.UTC())
nextDueDate = completedDate.UTC().Add(diff)
} else if chore.FrequencyType == "once" {
// if the chore is a one-time chore, then the next due date is nil
} else if chore.FrequencyType == "interval" {
// calculate the difference between the due date and now in days:
if *frequencyMetadata.Unit == "hours" {
nextDueDate = baseDate.UTC().Add(time.Hour * time.Duration(chore.Frequency))
} else if *frequencyMetadata.Unit == "days" {
nextDueDate = baseDate.UTC().AddDate(0, 0, chore.Frequency)
} else if *frequencyMetadata.Unit == "weeks" {
nextDueDate = baseDate.UTC().AddDate(0, 0, chore.Frequency*7)
} else if *frequencyMetadata.Unit == "months" {
nextDueDate = baseDate.UTC().AddDate(0, chore.Frequency, 0)
} else if *frequencyMetadata.Unit == "years" {
nextDueDate = baseDate.UTC().AddDate(chore.Frequency, 0, 0)
} else {
return nil, fmt.Errorf("invalid frequency unit, cannot calculate next due date")
}
} else if chore.FrequencyType == "days_of_the_week" {
// TODO : this logic is bad, need to be refactored and be better.
// coding at night is almost always bad idea.
// calculate the difference between the due date and now in days:
var frequencyMetadata chModel.FrequencyMetadata
err := json.Unmarshal([]byte(*chore.FrequencyMetadata), &frequencyMetadata)
if err != nil {
return nil, fmt.Errorf("error unmarshalling frequency metadata")
}
//we can only assign to days of the week that part of the frequency metadata.days
//it's array of days of the week, for example ["monday", "tuesday", "wednesday"]
// we need to find the next day of the week in the frequency metadata.days that we can schedule
// if this the last or there is only one. will use same otherwise find the next one:
// find the index of the chore day in the frequency metadata.days
// loop for next 7 days from the base, if the day in the frequency metadata.days then we can schedule it:
for i := 1; i <= 7; i++ {
nextDueDate = baseDate.AddDate(0, 0, i)
nextDay := strings.ToLower(nextDueDate.Weekday().String())
for _, day := range frequencyMetadata.Days {
if strings.ToLower(*day) == nextDay {
nextDate := nextDueDate.UTC()
return &nextDate, nil
}
}
}
} else if chore.FrequencyType == "day_of_the_month" {
var frequencyMetadata chModel.FrequencyMetadata
err := json.Unmarshal([]byte(*chore.FrequencyMetadata), &frequencyMetadata)
if err != nil {
return nil, fmt.Errorf("error unmarshalling frequency metadata")
}
for i := 1; i <= 12; i++ {
nextDueDate = baseDate.AddDate(0, i, 0)
// set the date to the first day of the month:
nextDueDate = time.Date(nextDueDate.Year(), nextDueDate.Month(), chore.Frequency, nextDueDate.Hour(), nextDueDate.Minute(), 0, 0, nextDueDate.Location())
nextMonth := strings.ToLower(nextDueDate.Month().String())
for _, month := range frequencyMetadata.Months {
if *month == nextMonth {
nextDate := nextDueDate.UTC()
return &nextDate, nil
}
}
}
} else if chore.FrequencyType == "no_repeat" {
return nil, nil
} else if chore.FrequencyType == "trigger" {
// if the chore is a trigger chore, then the next due date is nil
return nil, nil
} else {
return nil, fmt.Errorf("invalid frequency type, cannot calculate next due date")
}
return &nextDueDate, nil
}
func scheduleAdaptiveNextDueDate(chore *chModel.Chore, completedDate time.Time, history []*chModel.ChoreHistory) (*time.Time, error) {
history = append([]*chModel.ChoreHistory{
{
CompletedAt: &completedDate,
},
}, history...)
if len(history) < 2 {
if chore.NextDueDate != nil {
diff := completedDate.UTC().Sub(chore.NextDueDate.UTC())
nextDueDate := completedDate.UTC().Add(diff)
return &nextDueDate, nil
}
return nil, nil
}
var totalDelay float64
var totalWeight float64
decayFactor := 0.5 // Adjust this value to control the decay rate
for i := 0; i < len(history)-1; i++ {
delay := history[i].CompletedAt.UTC().Sub(history[i+1].CompletedAt.UTC()).Seconds()
weight := math.Pow(decayFactor, float64(i))
totalDelay += delay * weight
totalWeight += weight
}
averageDelay := totalDelay / totalWeight
nextDueDate := completedDate.UTC().Add(time.Duration(averageDelay) * time.Second)
return &nextDueDate, nil
}
func RemoveAssigneeAndReassign(chore *chModel.Chore, userID int) {
for i, assignee := range chore.Assignees {
if assignee.UserID == userID {
chore.Assignees = append(chore.Assignees[:i], chore.Assignees[i+1:]...)
break
}
}
if len(chore.Assignees) == 0 {
chore.AssignedTo = chore.CreatedBy
} else {
chore.AssignedTo = chore.Assignees[rand.Intn(len(chore.Assignees))].UserID
}
chore.UpdatedAt = time.Now()
}
