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package connections
import (
"fmt"
"github.com/MichaelMure/git-bug/graphql/models"
"github.com/cheekybits/genny/generic"
)
type NodeType generic.Type
type EdgeType generic.Type
type ConnectionType generic.Type
type NodeTypeEdger func(value NodeType, offset int) Edge
type NodeTypeConMaker func(edges []EdgeType, info models.PageInfo, totalCount int) (ConnectionType, error)
func NodeTypeCon(source []NodeType, edger NodeTypeEdger, conMaker NodeTypeConMaker, input models.ConnectionInput) (ConnectionType, error) {
var edges []EdgeType
var pageInfo models.PageInfo
emptyCon, _ := conMaker(edges, pageInfo, 0)
offset := 0
if input.After != nil {
for i, value := range source {
edge := edger(value, i)
if edge.GetCursor() == *input.After {
// remove all previous element including the "after" one
source = source[i+1:]
offset = i + 1
break
}
}
}
if input.Before != nil {
for i, value := range source {
edge := edger(value, i+offset)
if edge.GetCursor() == *input.Before {
// remove all after element including the "before" one
break
}
edges = append(edges, edge.(EdgeType))
}
} else {
edges = make([]EdgeType, len(source))
for i, value := range source {
edges[i] = edger(value, i+offset).(EdgeType)
}
}
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]
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:]
pageInfo.HasPreviousPage = true
}
}
return conMaker(edges, pageInfo, len(source))
}
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