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// This file was automatically generated by genny.
// Any changes will be lost if this file is regenerated.
// see https://github.com/cheekybits/genny
package connections
import (
"fmt"
"github.com/git-bug/git-bug/api/graphql/models"
"github.com/git-bug/git-bug/entity"
)
// LazyBugEdgeMaker define a function that take a entity.Id and an offset and
// create an Edge.
type LazyBugEdgeMaker func(value entity.Id, offset int) Edge
// LazyBugConMaker define a function that create a models.BugConnection
type LazyBugConMaker func(
edges []*LazyBugEdge,
nodes []entity.Id,
info *models.PageInfo,
totalCount int) (*models.BugConnection, error)
// LazyBugCon will paginate a source according to the input of a relay connection
func LazyBugCon(source []entity.Id, edgeMaker LazyBugEdgeMaker, conMaker LazyBugConMaker, input models.ConnectionInput) (*models.BugConnection, error) {
var nodes []entity.Id
var edges []*LazyBugEdge
var cursors []string
var pageInfo = &models.PageInfo{}
var totalCount = len(source)
emptyCon, _ := conMaker(edges, nodes, pageInfo, 0)
offset := 0
if input.After != nil {
for i, value := range source {
edge := edgeMaker(value, i)
if edge.GetCursor() == *input.After {
// remove all previous element including the "after" one
source = source[i+1:]
offset = i + 1
pageInfo.HasPreviousPage = true
break
}
}
}
if input.Before != nil {
for i, value := range source {
edge := edgeMaker(value, i+offset)
if edge.GetCursor() == *input.Before {
// remove all after element including the "before" one
pageInfo.HasNextPage = true
break
}
e := edge.(LazyBugEdge)
edges = append(edges, &e)
cursors = append(cursors, edge.GetCursor())
nodes = append(nodes, value)
}
} else {
edges = make([]*LazyBugEdge, len(source))
cursors = make([]string, len(source))
nodes = source
for i, value := range source {
edge := edgeMaker(value, i+offset)
e := edge.(LazyBugEdge)
edges[i] = &e
cursors[i] = edge.GetCursor()
}
}
if input.First != nil {
if *input.First < 0 {
return emptyCon, fmt.Errorf("first less than zero")
}
if len(edges) > *input.First {
// Slice result to be of length first by removing edges from the end
edges = edges[:*input.First]
cursors = cursors[:*input.First]
nodes = nodes[:*input.First]
pageInfo.HasNextPage = true
}
}
if input.Last != nil {
if *input.Last < 0 {
return emptyCon, fmt.Errorf("last less than zero")
}
if len(edges) > *input.Last {
// Slice result to be of length last by removing edges from the start
edges = edges[len(edges)-*input.Last:]
cursors = cursors[len(cursors)-*input.Last:]
nodes = nodes[len(nodes)-*input.Last:]
pageInfo.HasPreviousPage = true
}
}
// Fill up pageInfo cursors
if len(cursors) > 0 {
pageInfo.StartCursor = cursors[0]
pageInfo.EndCursor = cursors[len(cursors)-1]
}
return conMaker(edges, nodes, pageInfo, totalCount)
}
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