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package task
import (
"sort"
"strings"
"time"
)
// SortTasks orders tasks by start status, priority, due date, tag names and id.
// Started tasks are always placed before non-started ones. Tasks without a due
// date are placed after tasks with a due date. Overdue tasks are placed at the
// very top regardless of other properties.
//
// The sort order is:
// 1. Overdue tasks (oldest due date first)
// 2. Started tasks (not completed)
// 3. High priority tasks
// 4. Tasks with earlier due dates
// 5. Tasks sorted alphabetically by tags
// 6. Tasks sorted by ID (oldest first)
func SortTasks(tasks []Task) {
now := time.Now()
sort.Slice(tasks, func(i, j int) bool {
ti, tj := tasks[i], tasks[j]
if oi, oj := isOverdue(ti, now), isOverdue(tj, now); oi != oj {
return oi
}
startedI := ti.Start != "" && ti.Status != "completed"
startedJ := tj.Start != "" && tj.Status != "completed"
if startedI != startedJ {
return startedI
}
pi, pj := priorityRank(ti.Priority), priorityRank(tj.Priority)
if pi != pj {
return pi > pj
}
di, iok := parseDueDate(ti.Due)
dj, jok := parseDueDate(tj.Due)
if iok && !jok {
return true
}
if !iok && jok {
return false
}
if iok && jok && !di.Equal(dj) {
return di.Before(dj)
}
tgI, tgJ := joinTags(ti.Tags), joinTags(tj.Tags)
if tgI != tgJ {
return tgI < tgJ
}
return ti.ID < tj.ID
})
}
func joinTags(tags []string) string {
if len(tags) == 0 {
return ""
}
cpy := append([]string(nil), tags...)
sort.Strings(cpy)
return strings.Join(cpy, " ")
}
func priorityRank(priority string) int {
switch priority {
case "H":
return 3
case "M":
return 2
case "L":
return 1
default:
return 0
}
}
func parseDueDate(value string) (time.Time, bool) {
if value == "" {
return time.Time{}, false
}
parsed, err := time.Parse(DateFormat, value)
if err != nil {
return time.Time{}, false
}
return parsed, true
}
func isOverdue(task Task, now time.Time) bool {
due, ok := parseDueDate(task.Due)
return ok && now.After(due)
}
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