// 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 frontend

import (
	"testing"

	"github.com/google/go-cmp/cmp"
	"golang.org/x/pkgsite/internal"
	"golang.org/x/pkgsite/internal/stdlib"
	"golang.org/x/pkgsite/internal/testing/sample"
)

type testUnitPage struct {
	unit       *internal.UnitMeta
	name       string
	wantTitle  string
	wantType   string
	wantLabels []string
}

func TestPageTitlePageTypePageLabels(t *testing.T) {

	var tests []*testUnitPage
	m := sample.LegacyModule("golang.org/x/tools", "v1.0.0", "go/packages", "cmd/godoc")
	for _, u := range m.Units {
		um := &u.UnitMeta
		switch um.Path {
		case "golang.org/x/tools":
			tests = append(tests, &testUnitPage{um, "module golang.org/x/tools", "tools", pageTypeModule, []string{pageTypeModule}})
		case "golang.org/x/tools/go/packages":
			tests = append(tests, &testUnitPage{um, "package golang.org/x/tools/go/packages", "packages", pageTypePackage, []string{pageTypePackage}})
		case "golang.org/x/tools/go":
			tests = append(tests, &testUnitPage{um, "directory golang.org/x/tools/go", "go/", pageTypeDirectory, []string{pageTypeDirectory}})
		case "golang.org/x/tools/cmd/godoc":
			um.Name = "main"
			tests = append(tests, &testUnitPage{um, "package golang.org/x/tools/cmd/godoc", "godoc", pageTypeCommand, []string{pageTypeCommand}})
		case "golang.org/x/tools/cmd":
			tests = append(tests, &testUnitPage{um, "directory golang.org/x/tools/cmd", "cmd/", pageTypeDirectory, []string{pageTypeDirectory}})
		default:
			t.Fatalf("Unexpected path: %q", um.Path)
		}
	}

	m2 := sample.LegacyModule("golang.org/x/tools/gopls", "v1.0.0", "")
	m2.Units[0].Name = "main"
	tests = append(tests, &testUnitPage{&m2.Units[0].UnitMeta, "module golang.org/x/tools/gopls", "gopls", pageTypeCommand, []string{pageTypeCommand, pageTypeModule}})

	std := sample.LegacyModule(stdlib.ModulePath, "v1.0.0", "cmd/go")
	for _, u := range std.Units {
		um := &u.UnitMeta
		switch um.Path {
		case stdlib.ModulePath:
			tests = append(tests, &testUnitPage{um, "module std", "Standard library", pageTypeModuleStd, nil})
		case "cmd":
			tests = append(tests, &testUnitPage{um, "directory cmd", "cmd/", pageTypeDirectory, []string{pageTypeDirectory, pageTypeStdlib}})
		case "cmd/go":
			um.Name = "main"
			tests = append(tests, &testUnitPage{um, "command go", "go", pageTypeCommand, []string{pageTypeCommand, pageTypeStdlib}})
		default:
			t.Fatalf("Unexpected path: %q", um.Path)
		}
	}

	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			gotTitle := pageTitle(test.unit)
			if gotTitle != test.wantTitle {
				t.Errorf("pageTitle(%q): %q; want = %q", test.unit.Path, gotTitle, test.wantTitle)
			}
			gotType := pageType(test.unit)
			if gotType != test.wantType {
				t.Errorf("pageType(%q): %q; want = %q", test.unit.Path, gotType, test.wantType)
			}
			gotLabels := pageLabels(test.unit)
			if diff := cmp.Diff(test.wantLabels, gotLabels); diff != "" {
				t.Errorf("mismatch on pageLabels (-want +got):\n%s", diff)
			}
		})
	}
}