package gime

import "fmt"

// TimeEntryCollection is a collection of Time Entries for gomobile bindings
type TimeEntryCollection struct {
	list []TimeEntry
}

// Length returns how many time entries are in the collection
func (tc *TimeEntryCollection) Length() int {
	return len(tc.list)
}

// Get returns the TimeEntry at idx or a nil entry
func (tc *TimeEntryCollection) Get(idx int) *TimeEntry {
	if idx <= tc.Length() {
		return &tc.list[idx]
	}
	return nil
}

// Clear empties the list of TimeEntries
func (tc *TimeEntryCollection) Clear() {
	tc.list = tc.list[:0]
}

// Index finds the index of the given TimeEntry or -1 if not found
func (tc *TimeEntryCollection) Index(t *TimeEntry) int {
	for i, tst := range tc.list {
		if tst.Equals(t) {
			return i
		}
	}
	return -1
}

// Insert inserts a TimeEntry into the collection at i
func (tc *TimeEntryCollection) Insert(i int, t *TimeEntry) {
	if i < 0 || i > tc.Length() {
		fmt.Println("gime: Attempted to insert time entry at invalid index")
	}
	tc.list = append(tc.list, TimeEntry{})
	copy(tc.list[i+1:], tc.list[i:])
	tc.list[i] = *t
}

// Remove removes the TimeEntry at i from the collection
func (tc *TimeEntryCollection) Remove(i int) {
	if i < 0 || i >= tc.Length() {
		fmt.Println("gime: Attempted to remove time entry at invalid index")
	}
	copy(tc.list[i:], tc.list[i+1:])
	tc.list[len(tc.list)-1] = TimeEntry{}
	tc.list = tc.list[:len(tc.list)-1]
}

// Push adds an element to the end of the collection
func (tc *TimeEntryCollection) Push(t *TimeEntry) {
	tc.Insert(tc.Length(), t)
}

// Pop removes the last element from the collection
func (tc *TimeEntryCollection) Pop() *TimeEntry {
	ret := tc.list[tc.Length()-1]
	tc.Remove(tc.Length() - 1)
	return &ret
}

// Unshift adds an element to the front of the collection
func (tc *TimeEntryCollection) Unshift(t *TimeEntry) {
	tc.Insert(0, t)
}

// Shift removes an element from the front of the collection
func (tc *TimeEntryCollection) Shift(t *TimeEntry) *TimeEntry {
	ret := tc.list[0]
	tc.Remove(0)
	return &ret
}