package snippets

import (
	"bytes"
	"context"
	"go/ast"
	"net/http"
	"sort"

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

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

	var _ *[]int = in //@snippet(" //", litIntSliceAddr, "&[]int{$0\\}", "&[]int{$0\\}")
	var _ **[]int = in //@complete(" //")

	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 } //@item(myStructType, "myStruct", "struct{...}", "struct")

	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 myStructCopy struct { i int } //@item(myStructCopyType, "myStructCopy", "struct{...}", "struct")

	// Don't offer literal completion for convertible structs.
	ms = myStruct //@complete(" //", litStruct, myStructType, myStructCopyType)
}

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, fun) //@complete(")", litFunc),snippet(")", litFunc, "func(i, j int) bool {$0\\}", "func(i, j int) bool {$0\\}")

	http.HandleFunc("", f) //@snippet(")", litFunc, "func(w http.ResponseWriter, r *http.Request) {$0\\}", "func(${1:w} 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(w http.ResponseWriter, r *http.Request) {$0\\}", "func(${1:w} 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(mi1 myImpl, i int, mi2 myImpl) {$0\\}", "func(${1:mi1} myImpl, ${2:i} int, ${3:mi2} myImpl) {$0\\}")

	type aliasImpl = myImpl
	var aliasParams func(aliasImpl) aliasImpl
	aliasParams = f //@snippet(" //", litFunc, "func(ai aliasImpl) aliasImpl {$0\\}", "func(${1:ai} aliasImpl) aliasImpl {$0\\}")

	const two = 2
	var builtinTypes func([]int, [two]bool, map[string]string, struct{ i int }, interface{ foo() }, <-chan int)
	builtinTypes = f //@snippet(" //", litFunc, "func(i1 []int, b [two]bool, m map[string]string, s struct{ i int \\}, i2 interface{ foo() \\}, c <-chan int) {$0\\}", "func(${1:i1} []int, ${2:b} [two]bool, ${3:m} map[string]string, ${4:s} struct{ i int \\}, ${5:i2} interface{ foo() \\}, ${6:c} <-chan int) {$0\\}")

	var _ func(ast.Node) = f //@snippet(" //", litFunc, "func(n ast.Node) {$0\\}", "func(${1:n} ast.Node) {$0\\}")
	var _ func(error) = f //@snippet(" //", litFunc, "func(err error) {$0\\}", "func(${1:err} error) {$0\\}")
	var _ func(context.Context) = f //@snippet(" //", litFunc, "func(ctx context.Context) {$0\\}", "func(${1:ctx} context.Context) {$0\\}")

	type context struct {}
	var _ func(context) = f //@snippet(" //", litFunc, "func(ctx context) {$0\\}", "func(${1:ctx} context) {$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\\}")
}

func _() {
	float64() //@item(litFloat64, "float64()", "float64", "var")

	// don't complete to "&float64()"
	var _ *float64 = float64 //@complete(" //")

	var f float64
	f = fl //@complete(" //", litFloat64),snippet(" //", litFloat64, "float64($0)", "float64($0)")

	type myInt int
	myInt() //@item(litMyInt, "myInt()", "", "var")

	var mi myInt
	mi = my //@snippet(" //", litMyInt, "myInt($0)", "myInt($0)")
}

func _() {
	type ptrStruct struct {
		p *ptrStruct
	}

	ptrStruct{} //@item(litPtrStruct, "ptrStruct{}", "", "var")

	ptrStruct{
		p: &ptrSt, //@rank(",", litPtrStruct)
	}

	&ptrStruct{} //@item(litPtrStructPtr, "&ptrStruct{}", "", "var")

	&ptrStruct{
		p: ptrSt, //@rank(",", litPtrStructPtr)
	}
}

func _() {
	f := func(...[]int) {}
	f() //@snippet(")", litIntSlice, "[]int{$0\\}", "[]int{$0\\}")
}


func _() {
	// don't complete to "untyped int()"
	[]int{}[untyped] //@complete("] //")
}