// 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 (
	"context"
	"testing"

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

const sharedProgram = `
-- go.mod --
module mod

go 1.12
-- main.go --
package main

import "fmt"

func main() {
	fmt.Println("Hello World.")
}`

func runShared(t *testing.T, program string, testFunc func(ctx context.Context, t *testing.T, env1 *Env, env2 *Env)) {
	// Only run these tests in forwarded modes.
	modes := runner.Modes() & (Forwarded | SeparateProcess)
	runner.RunInMode(modes, t, sharedProgram, func(ctx context.Context, t *testing.T, env1 *Env) {
		// Create a second test session connected to the same workspace and server
		// as the first.
		env2 := NewEnv(ctx, t, env1.W, env1.Server)
		testFunc(ctx, t, env1, env2)
	})
}

func TestSimultaneousEdits(t *testing.T) {
	runShared(t, exampleProgram, func(ctx context.Context, t *testing.T, env1 *Env, env2 *Env) {
		// In editor #1, break fmt.Println as before.
		edit1 := fake.NewEdit(5, 11, 5, 12, "")
		env1.OpenFile("main.go")
		env1.EditBuffer("main.go", edit1)
		// In editor #2 remove the closing brace.
		edit2 := fake.NewEdit(6, 0, 6, 1, "")
		env2.OpenFile("main.go")
		env2.EditBuffer("main.go", edit2)

		// Now check that we got different diagnostics in each environment.
		env1.Await(DiagnosticAt("main.go", 5, 5))
		env2.Await(DiagnosticAt("main.go", 7, 0))
	})
}

func TestShutdown(t *testing.T) {
	runShared(t, sharedProgram, func(ctx context.Context, t *testing.T, env1 *Env, env2 *Env) {
		env1.CloseEditor()
		// Now make an edit in editor #2 to trigger diagnostics.
		edit2 := fake.NewEdit(6, 0, 6, 1, "")
		env2.OpenFile("main.go")
		env2.EditBuffer("main.go", edit2)
		env2.Await(DiagnosticAt("main.go", 7, 0))
	})
}