package tsm1

import (
	"fmt"
	"sort"
)

{{range .}}

// {{.Name}}Values represents a slice of {{.Name}} values.
type {{.Name}}Values []{{.Name}}Value

func (a {{.Name}}Values) MinTime() int64 {
	return a[0].UnixNano()
}

func (a {{.Name}}Values) MaxTime() int64 {
	return a[len(a)-1].UnixNano()
}

func (a {{.Name}}Values) Size() int {
	sz := 0
	for _, v := range a {
		sz += v.Size()
	}
	return sz
}

func (a {{.Name}}Values) ordered() bool {
	if len(a) <= 1 {
		return true
	}
	for i := 1; i < len(a); i++ {
		if av, ab := a[i-1].UnixNano(), a[i].UnixNano(); av >= ab {
			return false
		}
	}
	return true
}

func (a {{.Name}}Values) assertOrdered() {
	if len(a) <= 1 {
		return
	}
	for i := 1; i < len(a); i++ {
		if av, ab := a[i-1].UnixNano(), a[i].UnixNano(); av >= ab {
			panic(fmt.Sprintf("not ordered: %d %d >= %d", i, av, ab))
		}
	}
}


// Deduplicate returns a new slice with any values that have the same timestamp removed.
// The Value that appears last in the slice is the one that is kept.
func (a {{.Name}}Values) Deduplicate() {{.Name}}Values {
	m := make(map[int64]{{.Name}}Value)
	for _, val := range a {
		m[val.UnixNano()] = val
	}

	other := make({{.Name}}Values, 0, len(m))
	for _, val := range m {
		other = append(other, val)
	}

	sort.Sort(other)
	return other
}

//  Exclude returns the subset of values not in [min, max]
func (a {{.Name}}Values) Exclude(min, max int64) {{.Name}}Values {
	var i int
	for j := 0; j < len(a); j++ {
		if a[j].UnixNano() >= min && a[j].UnixNano() <= max {
			continue
		}

		a[i] = a[j]
		i++
	}
	return a[:i]
}

// Include returns the subset values between min and max inclusive.
func (a {{.Name}}Values) Include(min, max int64) {{.Name}}Values {
	var i int
	for j := 0; j < len(a); j++ {
		if a[j].UnixNano() < min || a[j].UnixNano() > max {
			continue
		}

		a[i] = a[j]
		i++
	}
	return a[:i]
}

// Merge overlays b to top of a.  If two values conflict with
// the same timestamp, b is used.  Both a and b must be sorted
// in ascending order.
func (a {{.Name}}Values) Merge(b {{.Name}}Values) {{.Name}}Values {
	if len(a) == 0 {
		return b
	}

	if len(b) == 0 {
		return a
	}

	// Normally, both a and b should not contain duplicates.  Due to a bug in older versions, it's
	// possible stored blocks might contain duplicate values.  Remove them if they exists before
	// merging.
	if !a.ordered() {
		a = a.Deduplicate()
	}

	if !b.ordered() {
		b = b.Deduplicate()
	}

	if a[len(a)-1].UnixNano() < b[0].UnixNano() {
		return append(a, b...)
	}

	if b[len(b)-1].UnixNano() < a[0].UnixNano() {
		return append(b, a...)
	}

	for i := 0; i < len(a) && len(b) > 0; i++ {
		av, bv := a[i].UnixNano(), b[0].UnixNano()
		// Value in a is greater than B, we need to merge
		if av > bv {
			// Save value in a
			temp := a[i]

			// Overwrite a with b
			a[i] = b[0]

			// Slide all values of b down 1
			copy(b, b[1:])
			b = b[:len(b)-1]

			var k int
			if len(b) > 0 && av > b[len(b)-1].UnixNano() {
				// Fast path where a is after b, we skip the search
				k = len(b)
			} else {
				// See where value we save from a should be inserted in b to keep b sorted
				k = sort.Search(len(b), func(i int) bool { return b[i].UnixNano() >= temp.UnixNano() })
			}

			if k == len(b) {
				// Last position?
				b = append(b, temp)
			} else if b[k].UnixNano() != temp.UnixNano() {
				// Save the last element, since it will get overwritten
				last := b[len(b)-1]
				// Somewhere in the middle of b, insert it only if it's not a duplicate
				copy(b[k+1:], b[k:])
				// Add the last vale to the end
				b = append(b, last)
				b[k] = temp
			}
		} else if av == bv {
			// Value in a an b are the same, use b
			a[i] = b[0]
			b = b[1:]
		}
	}

	if len(b) > 0 {
		return append(a, b...)
	}
	return a
}

// Sort methods
func (a {{.Name}}Values) Len() int           { return len(a) }
func (a {{.Name}}Values) Swap(i, j int)      { a[i], a[j] = a[j], a[i] }
func (a {{.Name}}Values) Less(i, j int) bool { return a[i].UnixNano() < a[j].UnixNano() }


{{ end }}