// 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 (
	"context"
	"testing"

	"github.com/google/go-cmp/cmp"
	"golang.org/x/pkgsite/internal"
	"golang.org/x/pkgsite/internal/postgres"
	"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)
			}
		})
	}
}

func TestGetNestedModules(t *testing.T) {
	ctx, cancel := context.WithTimeout(context.Background(), testTimeout)
	defer cancel()
	defer postgres.ResetTestDB(testDB, t)

	for _, m := range []*internal.Module{
		sample.LegacyModule("cloud.google.com/go", "v0.46.2", "storage", "spanner", "pubsub"),
		sample.LegacyModule("cloud.google.com/go/pubsub", "v1.6.1", sample.Suffix),
		sample.LegacyModule("cloud.google.com/go/spanner", "v1.9.0", sample.Suffix),
		sample.LegacyModule("cloud.google.com/go/storage", "v1.10.0", sample.Suffix),
		sample.LegacyModule("cloud.google.com/go/storage/v11", "v11.0.0", sample.Suffix),
		sample.LegacyModule("cloud.google.com/go/storage/v9", "v9.0.0", sample.Suffix),
		sample.LegacyModule("cloud.google.com/go/storage/module", "v1.10.0", sample.Suffix),
		sample.LegacyModule("cloud.google.com/go/v2", "v2.0.0", "storage", "spanner", "pubsub"),
	} {
		if err := testDB.InsertModule(ctx, m); err != nil {
			t.Fatal(err)
		}
	}

	for _, tc := range []struct {
		modulePath string
		want       []*NestedModule
	}{
		{
			modulePath: "cloud.google.com/go",
			want: []*NestedModule{
				{
					Suffix: "pubsub",
					URL:    "/cloud.google.com/go/pubsub",
				},
				{
					Suffix: "spanner",
					URL:    "/cloud.google.com/go/spanner",
				},
				{
					Suffix: "storage",
					URL:    "/cloud.google.com/go/storage/v11",
				},
				{
					Suffix: "storage/module",
					URL:    "/cloud.google.com/go/storage/module",
				},
			},
		},
		{
			modulePath: "cloud.google.com/go/spanner",
		},
		{
			modulePath: "cloud.google.com/go/storage",
			want: []*NestedModule{
				{
					Suffix: "module",
					URL:    "/cloud.google.com/go/storage/module",
				},
			},
		},
	} {
		t.Run(tc.modulePath, func(t *testing.T) {
			got, err := getNestedModules(ctx, testDB, &internal.UnitMeta{
				Path:       tc.modulePath,
				ModulePath: tc.modulePath,
			})
			if err != nil {
				t.Fatal(err)
			}
			if diff := cmp.Diff(tc.want, got); diff != "" {
				t.Errorf("mismatch (-want +got):\n%s", diff)
			}
		})
	}
}