// Copyright 2021 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 integration

import (
	"context"
	"encoding/json"
	"fmt"
	"testing"

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

func TestFrontendVersionsPage(t *testing.T) {
	defer postgres.ResetTestDB(testDB, t)
	for _, exp := range []struct {
		name string
		exps []string
	}{
		{
			"no experiment",
			[]string{
				internal.ExperimentSymbolHistoryVersionsPage,
			},
		},
		{
			"experiment insert and read symbol_history",
			[]string{
				internal.ExperimentReadSymbolHistory,
				internal.ExperimentSymbolHistoryVersionsPage,
			},
		},
	} {
		t.Run(exp.name, func(t *testing.T) {
			exps := exp.exps
			processVersions(
				experiment.NewContext(context.Background(), exps...),
				t, testModules)

			const modulePath = "example.com/symbols"
			for _, test := range []struct {
				name, pkgPath string
				want          []*frontend.VersionList
			}{
				{"versions page symbols - one version all symbols", modulePath, versionsPageSymbols},
				{"versions page hello - multi GOOS", modulePath + "/hello", versionsPageHello},
				{"versions page - test symbol signature is different for different build context", modulePath + "/multigoos", versionsPageMultiGoos},
				{"versions page - test symbol is introduced at different versions for different build context and changes across versions",
					modulePath + "/duplicate", versionsPageMultiGoosDuplicates},
			} {
				t.Run(test.name, func(t *testing.T) {
					urlPath := fmt.Sprintf("/%s?tab=versions&m=json", test.pkgPath)
					body := getFrontendPage(t, urlPath, exps...)
					var got frontend.VersionsDetails
					if err := json.Unmarshal([]byte(body), &got); err != nil {
						t.Fatalf("json.Unmarshal: %v", err)
					}
					if diff := cmp.Diff(test.want, got.ThisModule, cmpopts.IgnoreUnexported(frontend.Symbol{})); diff != "" {
						t.Errorf("mismatch (-want, got):\n%s", diff)
					}
				})
			}
		})
	}
}