package app

import (
	"path/filepath"
	"testing"
)

// These tests cover what saving says to the language server. The defect they
// were written against: a window that started Untitled gains its path through
// Save As, afterSave sent only didSave, and a server ignores didSave for a
// document it was never told is open — so the window had no completion until
// the editor was restarted.

func TestSavingAnUntitledWindowAnnouncesItsDocument(t *testing.T) {
	project := t.TempDir()
	t.Chdir(project)
	a, _ := newTestApp(t)
	client, server := newFakeLanguage(t, a)
	connectLanguage(a, client)
	a.Tick() // the start-up announcement runs, and finds nothing to tell

	a.NewFile()
	typeText(a, "package main")
	path := filepath.Join(project, "main.go")
	a.save(a.ActiveView(), path)

	waitForMethod(t, server, "textDocument/didOpen")
	if got := server.methodCount("textDocument/didSave"); got != 0 {
		t.Errorf("didSave was sent %d times for a document the server was never told is open", got)
	}
	if !a.language.Knows(path) {
		t.Errorf("after the save, the server still does not know %q", path)
	}
}

func TestSaveAsUnderANewNameClosesTheOldDocument(t *testing.T) {
	project := t.TempDir()
	t.Chdir(project)
	a, _ := newTestApp(t)
	client, server := newFakeLanguage(t, a)
	connectLanguage(a, client)

	writeTestFile(t, filepath.Join(project, "old.go"), "package main\n")
	a.Open("old.go")
	waitForMethod(t, server, "textDocument/didOpen")

	newPath := filepath.Join(project, "new.go")
	a.save(a.ActiveView(), newPath)

	waitForMethod(t, server, "textDocument/didClose")
	if a.language.Knows("old.go") {
		t.Errorf("the old document is still open on the server after Save As gave the buffer a new name")
	}
	if !a.language.Knows(newPath) {
		t.Errorf("the new document was never announced to the server")
	}
}

func TestSaveAsToTheSamePathClosesNothing(t *testing.T) {
	// Save As offered the file's own name and the user accepted it: that is a
	// write, not a rename, however the dialog spelt the path.
	project := t.TempDir()
	t.Chdir(project)
	a, _ := newTestApp(t)
	client, server := newFakeLanguage(t, a)
	connectLanguage(a, client)

	writeTestFile(t, filepath.Join(project, "main.go"), "package main\n")
	a.Open("main.go") // relative, as the command line gives it
	waitForMethod(t, server, "textDocument/didOpen")

	a.save(a.ActiveView(), filepath.Join(project, "main.go")) // absolute, as the dialog gives it

	waitForMethod(t, server, "textDocument/didSave")
	if got := server.methodCount("textDocument/didClose"); got != 0 {
		t.Errorf("didClose was sent %d times for a save that renamed nothing", got)
	}
}

func TestSavingAKnownDocumentReportsTheWrite(t *testing.T) {
	project := t.TempDir()
	t.Chdir(project)
	a, _ := newTestApp(t)
	client, server := newFakeLanguage(t, a)
	connectLanguage(a, client)

	writeTestFile(t, filepath.Join(project, "main.go"), "package main\n")
	a.Open("main.go")
	waitForMethod(t, server, "textDocument/didOpen")

	a.save(a.ActiveView(), a.ActiveView().Buffer().Path())

	waitForMethod(t, server, "textDocument/didSave")
	if got := server.methodCount("textDocument/didOpen"); got != 1 {
		t.Errorf("didOpen was sent %d times; saving an open document must not re-announce it", got)
	}
}