package snippets

import (
	"bytes"
	"net/http"
	"sort"

	"golang.org/x/tools/internal/lsp/foo"
)

func _() {
	[]int{}        //@item(litIntSlice, "[]int{}", "", "var")
	make([]int, 0) //@item(makeIntSlice, "make([]int, 0)", "", "func")

	var slice []int
	slice = i //@snippet(" //", litIntSlice, "[]int{$0\\}", "[]int{$0\\}")
	slice = m //@snippet(" //", makeIntSlice, "make([]int, ${1:})", "make([]int, ${1:0})")
}

func _() {
	type namedInt []int

	namedInt{}        //@item(litNamedSlice, "namedInt{}", "", "var")
	make(namedInt, 0) //@item(makeNamedSlice, "make(namedInt, 0)", "", "func")

	var namedSlice namedInt
	namedSlice = n //@snippet(" //", litNamedSlice, "namedInt{$0\\}", "namedInt{$0\\}")
	namedSlice = m //@snippet(" //", makeNamedSlice, "make(namedInt, ${1:})", "make(namedInt, ${1:0})")
}

func _() {
	make(chan int) //@item(makeChan, "make(chan int)", "", "func")

	var ch chan int
	ch = m //@snippet(" //", makeChan, "make(chan int)", "make(chan int)")
}

func _() {
	map[string]struct{}{}     //@item(litMap, "map[string]struct{}{}", "", "var")
	make(map[string]struct{}) //@item(makeMap, "make(map[string]struct{})", "", "func")

	var m map[string]struct{}
	m = m //@snippet(" //", litMap, "map[string]struct{\\}{$0\\}", "map[string]struct{\\}{$0\\}")
	m = m //@snippet(" //", makeMap, "make(map[string]struct{\\})", "make(map[string]struct{\\})")

	struct{}{} //@item(litEmptyStruct, "struct{}{}", "", "var")

	m["hi"] = s //@snippet(" //", litEmptyStruct, "struct{\\}{\\}", "struct{\\}{\\}")
}

func _() {
	type myStruct struct{ i int }

	myStruct{}  //@item(litStruct, "myStruct{}", "", "var")
	&myStruct{} //@item(litStructPtr, "&myStruct{}", "", "var")

	var ms myStruct
	ms = m //@snippet(" //", litStruct, "myStruct{$0\\}", "myStruct{$0\\}")

	var msPtr *myStruct
	msPtr = m //@snippet(" //", litStructPtr, "&myStruct{$0\\}", "&myStruct{$0\\}")

	msPtr = &m //@snippet(" //", litStruct, "myStruct{$0\\}", "myStruct{$0\\}")
}

type myImpl struct{}

func (myImpl) foo() {}

func (*myImpl) bar() {}

type myBasicImpl string

func (myBasicImpl) foo() {}

func _() {
	type myIntf interface {
		foo()
	}

	myImpl{} //@item(litImpl, "myImpl{}", "", "var")

	var mi myIntf
	mi = m //@snippet(" //", litImpl, "myImpl{\\}", "myImpl{\\}")

	myBasicImpl() //@item(litBasicImpl, "myBasicImpl()", "string", "var")

	mi = m //@snippet(" //", litBasicImpl, "myBasicImpl($0)", "myBasicImpl($0)")

	// only satisfied by pointer to myImpl
	type myPtrIntf interface {
		bar()
	}

	&myImpl{} //@item(litImplPtr, "&myImpl{}", "", "var")

	var mpi myPtrIntf
	mpi = m //@snippet(" //", litImplPtr, "&myImpl{\\}", "&myImpl{\\}")
}

func _() {
	var s struct{ i []int } //@item(litSliceField, "i", "[]int", "field")
	var foo []int
	// no literal completions after selector
	foo = s.i //@complete(" //", litSliceField)
}

func _() {
	type myStruct struct{ i int } //@item(litMyStructType, "myStruct", "struct{...}", "struct")
	myStruct{} //@item(litMyStruct, "myStruct{}", "", "var")

	foo := func(s string, args ...myStruct) {}
	// Don't give literal slice candidate for variadic arg.
	// Do give literal candidates for variadic element.
	foo("", myStruct) //@complete(")", litMyStruct, litMyStructType)
}

func _() {
	Buffer{} //@item(litBuffer, "Buffer{}", "", "var")

	var b *bytes.Buffer
	b = bytes.Bu //@snippet(" //", litBuffer, "Buffer{\\}", "Buffer{\\}")
}

func _() {
	_ = "func(...) {}" //@item(litFunc, "func(...) {}", "", "var")

	sort.Slice(nil, f) //@snippet(")", litFunc, "func(i, j int) bool {$0\\}", "func(i, j int) bool {$0\\}")

	http.HandleFunc("", f) //@snippet(")", litFunc, "", "func(${1:rw} http.ResponseWriter, ${2:r} *http.Request) {$0\\}")

	// no literal "func" completions
	http.Handle("", fun) //@complete(")")

	http.HandlerFunc() //@item(handlerFunc, "http.HandlerFunc()", "", "var")
	http.Handle("", h) //@snippet(")", handlerFunc, "http.HandlerFunc($0)", "http.HandlerFunc($0)")
	http.Handle("", http.HandlerFunc()) //@snippet("))", litFunc, "", "func(${1:rw} http.ResponseWriter, ${2:r} *http.Request) {$0\\}")

	var namedReturn func(s string) (b bool)
	namedReturn = f //@snippet(" //", litFunc, "func(s string) (b bool) {$0\\}", "func(s string) (b bool) {$0\\}")

	var multiReturn func() (bool, int)
	multiReturn = f //@snippet(" //", litFunc, "func() (bool, int) {$0\\}", "func() (bool, int) {$0\\}")

	var multiNamedReturn func() (b bool, i int)
	multiNamedReturn = f //@snippet(" //", litFunc, "func() (b bool, i int) {$0\\}", "func() (b bool, i int) {$0\\}")

	var duplicateParams func(myImpl, int, myImpl)
	duplicateParams = f //@snippet(" //", litFunc, "", "func(${1:mi} myImpl, ${2:_} int, ${3:_} myImpl) {$0\\}")
}

func _() {
	StructFoo{} //@item(litStructFoo, "StructFoo{}", "struct{...}", "struct")

	var sfp *foo.StructFoo
	// Don't insert the "&" before "StructFoo{}".
	sfp = foo.Str //@snippet(" //", litStructFoo, "StructFoo{$0\\}", "StructFoo{$0\\}")

	var sf foo.StructFoo
	sf = foo.Str //@snippet(" //", litStructFoo, "StructFoo{$0\\}", "StructFoo{$0\\}")
	sf = foo. //@snippet(" //", litStructFoo, "StructFoo{$0\\}", "StructFoo{$0\\}")
}