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package main

import (
	"flag"
	"os"
	"path/filepath"
	"slices"
	"testing"

	"rickub.com/turbo-editors/turbo-core/app"
	"rickub.com/turbo-editors/turbo-core/settings"

	"rickub.com/turbo-editors/turbo-golo/internal/gololang"
)

// withArgs runs the command line parser against a fixed argument list, and
// restores the real one afterwards so tests do not affect each other.
func withArgs(t *testing.T, args ...string) options {
	t.Helper()

	realArgs, realFlags := os.Args, flag.CommandLine
	t.Cleanup(func() { os.Args, flag.CommandLine = realArgs, realFlags })

	os.Args = append([]string{"turbo-golo"}, args...)
	flag.CommandLine = flag.NewFlagSet(os.Args[0], flag.ContinueOnError)
	return parseFlags()
}

func TestFilesAreWhatIsLeftAfterTheFlags(t *testing.T) {
	opts := withArgs(t, "-no-lsp", "main.golo", "lib/x.golo")

	if !opts.noLSP {
		t.Error("-no-lsp was not read")
	}
	if want := []string{"main.golo", "lib/x.golo"}; !slices.Equal(opts.files, want) {
		t.Errorf("files = %v, want %v", opts.files, want)
	}
}

func TestTheThemeFlagDefaultsToEmptyRatherThanToAName(t *testing.T) {
	// Empty is what lets "was -theme given?" still be answered afterwards, and
	// that is what lets the project's settings fill it in without overriding an
	// explicit choice.
	if opts := withArgs(t); opts.theme != "" {
		t.Errorf("theme = %q with no flag, want the empty string", opts.theme)
	}
}

func TestTheThemeFlagBeatsTheProjectSettings(t *testing.T) {
	project := settings.Default()
	project.Theme = "cobalt"

	if got := themeName(options{theme: "monochrome"}, project); got != "monochrome" {
		t.Errorf("themeName() = %q, want the flag's %q", got, "monochrome")
	}
}

func TestTheProjectSettingsBeatTheBuiltInDefault(t *testing.T) {
	project := settings.Default()
	project.Theme = "cobalt"

	if got := themeName(options{}, project); got != "cobalt" {
		t.Errorf("themeName() = %q, want the project's %q", got, "cobalt")
	}
}

func TestTheBuiltInDefaultIsUsedWhenNobodySaysOtherwise(t *testing.T) {
	if got := themeName(options{}, settings.Default()); got == "" {
		t.Error("themeName() = \"\" with nothing set, want the library's default")
	}
}

func TestTheProjectRootIsTheDirectoryOfTheFile(t *testing.T) {
	// app.ProjectRoot walks up looking for the profile's RootMarkers, and Golo
	// has none: a script is a file, and there is no manifest above it to find.
	// So the server is started in the file's own directory, however deep.
	root := t.TempDir()
	nested := filepath.Join(root, "scripts", "tools")
	if err := os.MkdirAll(nested, 0o755); err != nil {
		t.Fatal(err)
	}

	file := filepath.Join(nested, "main.golo")
	if got := app.ProjectRoot(gololang.Profile(), []string{file}); got != nested {
		t.Errorf("ProjectRoot(%q) = %q, want the file's own directory %q", file, got, nested)
	}
}

func TestNothingAboveTheFileChangesTheRoot(t *testing.T) {
	// A .git directory and a main.golo higher up are the two things somebody
	// might expect to count as a project. Neither is a marker here, so neither
	// moves the root: the rule is "no walk", and this pins it.
	root := t.TempDir()
	nested := filepath.Join(root, "lib")
	if err := os.MkdirAll(filepath.Join(root, ".git"), 0o755); err != nil {
		t.Fatal(err)
	}
	if err := os.MkdirAll(nested, 0o755); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(filepath.Join(root, "main.golo"), []byte("module m\n"), 0o644); err != nil {
		t.Fatal(err)
	}

	file := filepath.Join(nested, "helpers.golo")
	if got := app.ProjectRoot(gololang.Profile(), []string{file}); got != nested {
		t.Errorf("ProjectRoot(%q) = %q, want %q; something above the file was taken for a marker", file, got, nested)
	}
}

func TestWithNoFileTheRootIsTheWorkingDirectory(t *testing.T) {
	// `turbo-golo` with no file opens an empty window, and the server has to
	// be started somewhere. Where the editor was started is the only answer.
	dir := t.TempDir()
	t.Chdir(dir)

	got := app.ProjectRoot(gololang.Profile(), nil)
	want, err := os.Getwd()
	if err != nil {
		t.Fatal(err)
	}
	if got != want {
		t.Errorf("ProjectRoot() with no file = %q, want the working directory %q", got, want)
	}
}

func TestLoadingSettingsFromADirectoryWithNoneGivesTheDefaults(t *testing.T) {
	// A directory somebody merely started the editor in has said nothing, and
	// the editor must not write to it. The starter file turns autosave on; the
	// default leaves it off.
	dir := t.TempDir()
	t.Chdir(dir)

	project, loaded := loadProjectSettings(gololang.Profile())
	if project == "" {
		t.Error("loadProjectSettings returned no project directory")
	}
	if loaded.Autosave {
		t.Error("autosave is on with no settings file, want it off")
	}
}

func TestABrokenSettingsFileDoesNotStopTheEditorOpening(t *testing.T) {
	// A broken settings file must not stop the editor opening, because the
	// editor is how you would fix it.
	dir := t.TempDir()
	p := gololang.Profile()
	if err := os.MkdirAll(filepath.Join(dir, p.ProjectDir()), 0o755); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(settings.Path(p, dir), []byte("this is not ["), 0o644); err != nil {
		t.Fatal(err)
	}
	t.Chdir(dir)

	if _, loaded := loadProjectSettings(p); loaded != settings.Default() {
		t.Errorf("loadProjectSettings() = %+v with a broken file, want the defaults", loaded)
	}
}