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package main

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

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

	"rickub.com/turbo-editors/turbo-js/internal/jslang"
)

// 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-js"}, args...)
	flag.CommandLine = flag.NewFlagSet(os.Args[0], flag.ContinueOnError)
	return parseFlags()
}

func TestMainRegistersTheLanguageExplicitly(t *testing.T) {
	// "This editor knows JavaScript" is a line somebody can read in main.go,
	// not an init function somewhere. Every other test here calls Register
	// itself, so this is the only one that notices if run() stopped doing so.
	source, err := os.ReadFile("main.go")
	if err != nil {
		t.Fatalf("reading main.go: %v", err)
	}
	if !strings.Contains(string(source), "\n\tjslang.Register()\n") {
		t.Error("main.go no longer calls jslang.Register() as a statement of its own")
	}
}

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

	if !opts.noLSP {
		t.Error("-no-lsp was not read")
	}
	if want := []string{"main.js", "lib/x.mjs"}; !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 TestTheProjectRootIsTheDirectoryHoldingPackageJSON(t *testing.T) {
	// typescript-language-server is given the package's boundary, which is
	// where it resolves imports from. The walk itself is turbo-core's; what is
	// checked here is that Turbo JS's profile asks it to look for a
	// package.json.
	root := t.TempDir()
	if err := os.WriteFile(filepath.Join(root, "package.json"), []byte("{\"name\": \"x\"}\n"), 0o644); err != nil {
		t.Fatalf("writing package.json: %v", err)
	}
	nested := filepath.Join(root, "src", "deep")
	if err := os.MkdirAll(nested, 0o755); err != nil {
		t.Fatalf("creating the tree: %v", err)
	}
	file := filepath.Join(nested, "deep.js")
	if err := os.WriteFile(file, []byte("export const f = () => 1;\n"), 0o644); err != nil {
		t.Fatalf("writing the file: %v", err)
	}

	if got := app.ProjectRoot(jslang.Profile(), []string{file}); got != root {
		t.Errorf("ProjectRoot() = %q, want the package root %q", got, root)
	}
}

func TestTheNearestPackageJSONWinsInAMonorepo(t *testing.T) {
	// A workspace holds a package.json at its root and one per package. The
	// package being edited is the nearest one going up, and that is the
	// project the server should see.
	workspace := t.TempDir()
	pkg := filepath.Join(workspace, "packages", "api")
	if err := os.MkdirAll(filepath.Join(pkg, "src"), 0o755); err != nil {
		t.Fatalf("creating the tree: %v", err)
	}
	for _, dir := range []string{workspace, pkg} {
		if err := os.WriteFile(filepath.Join(dir, "package.json"), []byte("{}\n"), 0o644); err != nil {
			t.Fatalf("writing package.json: %v", err)
		}
	}
	file := filepath.Join(pkg, "src", "index.js")
	if err := os.WriteFile(file, []byte("\n"), 0o644); err != nil {
		t.Fatalf("writing the file: %v", err)
	}

	if got := app.ProjectRoot(jslang.Profile(), []string{file}); got != pkg {
		t.Errorf("ProjectRoot() = %q, want the nearest package %q", got, pkg)
	}
}

func TestThemeNamePrefersTheFlagOverTheProject(t *testing.T) {
	got := themeName(options{theme: "borland-light"}, settings.Settings{Theme: "turbo-dark"})

	if got != "borland-light" {
		t.Errorf("themeName() = %q; an explicit -theme must win over the project's", got)
	}
}

func TestThemeNameUsesTheProjectWhenNoFlagWasGiven(t *testing.T) {
	got := themeName(options{}, settings.Settings{Theme: "turbo-dark"})

	if got != "turbo-dark" {
		t.Errorf("themeName() = %q, want the project's theme", got)
	}
}

func TestThemeNameFallsBackToTheDefault(t *testing.T) {
	got := themeName(options{}, settings.Settings{})

	if got != theme.DefaultName {
		t.Errorf("themeName() = %q, want %q", got, theme.DefaultName)
	}
}

func TestLoadProjectSettingsReadsTheWorkingDirectory(t *testing.T) {
	project := t.TempDir()
	t.Chdir(project)
	if err := os.MkdirAll(settings.Dir(jslang.Profile(), project), 0o755); err != nil {
		t.Fatalf("creating the settings directory: %v", err)
	}
	contents := "[editor]\ntheme = \"turbo-dark\"\nautosave = true\n"
	if err := os.WriteFile(settings.Path(jslang.Profile(), project), []byte(contents), 0o644); err != nil {
		t.Fatalf("writing the settings file: %v", err)
	}

	_, loaded := loadProjectSettings(jslang.Profile())

	if loaded.Theme != "turbo-dark" {
		t.Errorf("Theme = %q, want turbo-dark", loaded.Theme)
	}
	if !loaded.Autosave {
		t.Error("Autosave = false, want the file's true")
	}
}

func TestLoadProjectSettingsDoesNotWalkUpToAParent(t *testing.T) {
	// "The project is where you started the editor" is the rule; a settings
	// file one directory up belongs to a different project.
	parent := t.TempDir()
	if err := os.MkdirAll(settings.Dir(jslang.Profile(), parent), 0o755); err != nil {
		t.Fatalf("creating the settings directory: %v", err)
	}
	if err := os.WriteFile(settings.Path(jslang.Profile(), parent), []byte("[editor]\ntheme = \"turbo-dark\"\n"), 0o644); err != nil {
		t.Fatalf("writing the settings file: %v", err)
	}
	child := filepath.Join(parent, "src")
	if err := os.Mkdir(child, 0o755); err != nil {
		t.Fatalf("creating the child directory: %v", err)
	}
	t.Chdir(child)

	_, loaded := loadProjectSettings(jslang.Profile())

	if loaded.Theme != "" {
		t.Errorf("Theme = %q; settings were read from a parent directory", loaded.Theme)
	}
}

func TestLoadProjectSettingsCarriesOnWithoutAFile(t *testing.T) {
	t.Chdir(t.TempDir())

	_, loaded := loadProjectSettings(jslang.Profile())

	if loaded != settings.Default() {
		t.Errorf("loadProjectSettings() = %+v, want the defaults", loaded)
	}
}

func TestABrokenSettingsFileDoesNotStopTheEditor(t *testing.T) {
	// The editor is how you would fix the file, so it has to open.
	project := t.TempDir()
	t.Chdir(project)
	if err := os.MkdirAll(settings.Dir(jslang.Profile(), project), 0o755); err != nil {
		t.Fatalf("creating the settings directory: %v", err)
	}
	if err := os.WriteFile(settings.Path(jslang.Profile(), project), []byte("[editor\nnot toml"), 0o644); err != nil {
		t.Fatalf("writing the settings file: %v", err)
	}

	_, loaded := loadProjectSettings(jslang.Profile())

	if loaded != settings.Default() {
		t.Errorf("loadProjectSettings() = %+v, want the defaults", loaded)
	}
}