// Copyright 2020 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package regtest

import (
	"testing"

	"golang.org/x/tools/internal/lsp/fake"
	"golang.org/x/tools/internal/lsp/protocol"
	"golang.org/x/tools/internal/lsp/source"
	"golang.org/x/tools/internal/lsp/tests"
	"golang.org/x/tools/internal/testenv"
)

func TestDisablingCodeLens(t *testing.T) {
	const workspace = `
-- go.mod --
module codelens.test
-- lib.go --
package lib

type Number int

const (
	Zero Number = iota
	One
	Two
)

//go:generate stringer -type=Number
`
	tests := []struct {
		label        string
		enabled      map[string]bool
		wantCodeLens bool
	}{
		{
			label:        "default",
			wantCodeLens: true,
		},
		{
			label:        "generate disabled",
			enabled:      map[string]bool{source.CommandGenerate.Name: false},
			wantCodeLens: false,
		},
	}
	for _, test := range tests {
		t.Run(test.label, func(t *testing.T) {
			runner.Run(t, workspace, func(t *testing.T, env *Env) {
				env.OpenFile("lib.go")
				lens := env.CodeLens("lib.go")
				if gotCodeLens := len(lens) > 0; gotCodeLens != test.wantCodeLens {
					t.Errorf("got codeLens: %t, want %t", gotCodeLens, test.wantCodeLens)
				}
			}, WithEditorConfig(fake.EditorConfig{CodeLens: test.enabled}))
		})
	}
}

// This test confirms the full functionality of the code lenses for updating
// dependencies in a go.mod file. It checks for the code lens that suggests
// an update and then executes the command associated with that code lens. A
// regression test for golang/go#39446.
func TestUpdateCodelens(t *testing.T) {
	const proxyWithLatest = `
-- golang.org/x/hello@v1.3.3/go.mod --
module golang.org/x/hello

go 1.14
-- golang.org/x/hello@v1.3.3/hi/hi.go --
package hi

var Goodbye error
	-- golang.org/x/hello@v1.2.3/go.mod --
module golang.org/x/hello

go 1.14
-- golang.org/x/hello@v1.2.3/hi/hi.go --
package hi

var Goodbye error
`

	const shouldUpdateDep = `
-- go.mod --
module mod.com

go 1.14

require golang.org/x/hello v1.2.3
-- main.go --
package main

import "golang.org/x/hello/hi"

func main() {
	_ = hi.Goodbye
}
`
	runner.Run(t, shouldUpdateDep, func(t *testing.T, env *Env) {
		env.OpenFile("go.mod")
		lenses := env.CodeLens("go.mod")
		want := "Upgrade dependency to v1.3.3"
		var found protocol.CodeLens
		for _, lens := range lenses {
			if lens.Command.Title == want {
				found = lens
				break
			}
		}
		if found.Command.Command == "" {
			t.Fatalf("did not find lens %q, got %v", want, lenses)
		}
		if _, err := env.Editor.Server.ExecuteCommand(env.Ctx, &protocol.ExecuteCommandParams{
			Command:   found.Command.Command,
			Arguments: found.Command.Arguments,
		}); err != nil {
			t.Fatal(err)
		}
		env.Await(NoOutstandingWork())
		got := env.ReadWorkspaceFile("go.mod")
		const wantGoMod = `module mod.com

go 1.14

require golang.org/x/hello v1.3.3
`
		if got != wantGoMod {
			t.Fatalf("go.mod upgrade failed:\n%s", tests.Diff(wantGoMod, got))
		}
	}, WithProxyFiles(proxyWithLatest))
}

func TestUnusedDependenciesCodelens(t *testing.T) {
	testenv.NeedsGo1Point(t, 14)
	const proxy = `
-- golang.org/x/hello@v1.0.0/go.mod --
module golang.org/x/hello

go 1.14
-- golang.org/x/hello@v1.0.0/hi/hi.go --
package hi

var Goodbye error
-- golang.org/x/unused@v1.0.0/go.mod --
module golang.org/x/unused

go 1.14
-- golang.org/x/unused@v1.0.0/nouse/nouse.go --
package nouse

var NotUsed error
`

	const shouldRemoveDep = `
-- go.mod --
module mod.com

go 1.14

require golang.org/x/hello v1.0.0
require golang.org/x/unused v1.0.0
-- main.go --
package main

import "golang.org/x/hello/hi"

func main() {
	_ = hi.Goodbye
}
`
	runner.Run(t, shouldRemoveDep, func(t *testing.T, env *Env) {
		env.OpenFile("go.mod")
		lenses := env.CodeLens("go.mod")
		want := "Tidy module"
		var found protocol.CodeLens
		for _, lens := range lenses {
			if lens.Command.Title == want {
				found = lens
				break
			}
		}
		if found.Command.Command == "" {
			t.Fatalf("did not find lens %q, got %v", want, found.Command)
		}
		if _, err := env.Editor.Server.ExecuteCommand(env.Ctx, &protocol.ExecuteCommandParams{
			Command:   found.Command.Command,
			Arguments: found.Command.Arguments,
		}); err != nil {
			t.Fatal(err)
		}
		env.Await(NoOutstandingWork())
		got := env.ReadWorkspaceFile("go.mod")
		const wantGoMod = `module mod.com

go 1.14

require golang.org/x/hello v1.0.0
`
		if got != wantGoMod {
			t.Fatalf("go.mod tidy failed:\n%s", tests.Diff(wantGoMod, got))
		}
	}, WithProxyFiles(proxy))
}

func TestRegenerateCgo(t *testing.T) {
	testenv.NeedsTool(t, "cgo")
	testenv.NeedsGo1Point(t, 15)

	const workspace = `
-- go.mod --
module example.com
-- cgo.go --
package x

/*
int fortythree() { return 42; }
*/
import "C"

func Foo() {
	print(C.fortytwo())
}
`
	runner.Run(t, workspace, func(t *testing.T, env *Env) {
		// Open the file. We should have a nonexistant symbol.
		env.OpenFile("cgo.go")
		env.Await(env.DiagnosticAtRegexp("cgo.go", `C\.(fortytwo)`)) // could not determine kind of name for C.fortytwo

		// Fix the C function name. We haven't regenerated cgo, so nothing should be fixed.
		env.RegexpReplace("cgo.go", `int fortythree`, "int fortytwo")
		env.SaveBuffer("cgo.go")
		env.Await(env.DiagnosticAtRegexp("cgo.go", `C\.(fortytwo)`))

		// Regenerate cgo, fixing the diagnostic.
		lenses := env.CodeLens("cgo.go")
		var lens protocol.CodeLens
		for _, l := range lenses {
			if l.Command.Command == source.CommandRegenerateCgo.Name {
				lens = l
			}
		}
		if _, err := env.Editor.Server.ExecuteCommand(env.Ctx, &protocol.ExecuteCommandParams{
			Command:   lens.Command.Command,
			Arguments: lens.Command.Arguments,
		}); err != nil {
			t.Fatal(err)
		}
		env.Await(EmptyDiagnostics("cgo.go"))
	})
}