// Copyright 2019 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 postgres

import (
	"context"
	"database/sql"
	"errors"
	"net/http"
	"testing"
	"time"

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

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

	// verify that latest index timestamp works
	initialTime, err := testDB.LatestIndexTimestamp(ctx)
	if err != nil {
		t.Fatal(err)
	}
	if want := (time.Time{}); initialTime != want {
		t.Errorf("testDB.LatestIndexTimestamp(ctx) = %v, want %v", initialTime, want)
	}

	now := sample.NowTruncated()
	latest := now.Add(10 * time.Second)
	// insert a FooVersion with no Timestamp, to ensure that it is later updated
	// on conflict.
	initialFooVersion := &internal.IndexVersion{
		Path:    "foo.com/bar",
		Version: "v1.0.0",
	}
	if err := testDB.InsertIndexVersions(ctx, []*internal.IndexVersion{initialFooVersion}); err != nil {
		t.Fatal(err)
	}
	fooVersion := &internal.IndexVersion{
		Path:      "foo.com/bar",
		Version:   "v1.0.0",
		Timestamp: now,
	}
	bazVersion := &internal.IndexVersion{
		Path:      "baz.com/quux",
		Version:   "v2.0.1",
		Timestamp: latest,
	}
	versions := []*internal.IndexVersion{fooVersion, bazVersion}
	if err := testDB.InsertIndexVersions(ctx, versions); err != nil {
		t.Fatal(err)
	}

	gotVersions, err := testDB.GetNextModulesToFetch(ctx, 10)
	if err != nil {
		t.Fatal(err)
	}

	wantVersions := []*internal.ModuleVersionState{
		{ModulePath: "baz.com/quux", Version: "v2.0.1", IndexTimestamp: bazVersion.Timestamp},
		{ModulePath: "foo.com/bar", Version: "v1.0.0", IndexTimestamp: fooVersion.Timestamp},
	}
	ignore := cmpopts.IgnoreFields(internal.ModuleVersionState{}, "CreatedAt", "LastProcessedAt", "NextProcessedAfter")
	if diff := cmp.Diff(wantVersions, gotVersions, ignore); diff != "" {
		t.Fatalf("testDB.GetVersionsToFetch(ctx, 10) mismatch (-want +got):\n%s", diff)
	}

	var (
		statusCode      = 500
		fetchErr        = errors.New("bad request")
		goModPath       = "goModPath"
		pkgVersionState = &internal.PackageVersionState{
			ModulePath:  "foo.com/bar",
			PackagePath: "foo.com/bar/foo",
			Version:     "v1.0.0",
			Status:      500,
		}
	)
	if err := testDB.UpsertModuleVersionState(ctx, fooVersion.Path, fooVersion.Version, "", fooVersion.Timestamp, statusCode, goModPath, fetchErr, []*internal.PackageVersionState{pkgVersionState}); err != nil {
		t.Fatal(err)
	}
	errString := fetchErr.Error()
	numPackages := 1
	wantFooState := &internal.ModuleVersionState{
		ModulePath:     "foo.com/bar",
		Version:        "v1.0.0",
		IndexTimestamp: now,
		TryCount:       1,
		GoModPath:      goModPath,
		Error:          errString,
		Status:         statusCode,
		NumPackages:    &numPackages,
	}
	gotFooState, err := testDB.GetModuleVersionState(ctx, wantFooState.ModulePath, wantFooState.Version)
	if err != nil {
		t.Fatal(err)
	}
	if diff := cmp.Diff(wantFooState, gotFooState, ignore); diff != "" {
		t.Errorf("testDB.GetModuleVersionState(ctx, %q, %q) mismatch (-want +got)\n%s", wantFooState.ModulePath, wantFooState.Version, diff)
	}

	gotPVS, err := testDB.GetPackageVersionState(ctx, pkgVersionState.PackagePath, pkgVersionState.ModulePath, pkgVersionState.Version)
	if err != nil {
		t.Fatal(err)
	}
	if diff := cmp.Diff(pkgVersionState, gotPVS); diff != "" {
		t.Errorf("testDB.GetPackageVersionStates(ctx, %q, %q) mismatch (-want +got)\n%s", wantFooState.ModulePath, wantFooState.Version, diff)
	}

	gotPkgVersionStates, err := testDB.GetPackageVersionStatesForModule(ctx,
		wantFooState.ModulePath, wantFooState.Version)
	if err != nil {
		t.Fatal(err)
	}
	if diff := cmp.Diff([]*internal.PackageVersionState{pkgVersionState}, gotPkgVersionStates); diff != "" {
		t.Errorf("testDB.GetPackageVersionStates(ctx, %q, %q) mismatch (-want +got)\n%s", wantFooState.ModulePath, wantFooState.Version, diff)
	}

	stats, err := testDB.GetVersionStats(ctx)
	if err != nil {
		t.Fatal(err)
	}
	wantStats := &VersionStats{
		LatestTimestamp: latest,
		VersionCounts: map[int]int{
			0:   1,
			500: 1,
		},
	}
	if diff := cmp.Diff(wantStats, stats); diff != "" {
		t.Errorf("testDB.GetVersionStats(ctx) mismatch (-want +got):\n%s", diff)
	}

	if _, err := testDB.GetRecentFailedVersions(ctx, 10); err != nil {
		t.Fatal(err)
	}
}

func TestUpsertModuleVersionStates(t *testing.T) {
	ctx, cancel := context.WithTimeout(context.Background(), testTimeout)
	defer cancel()

	m := sample.DefaultModule()
	appVersion := time.Now().String()

	for _, test := range []struct {
		name                  string
		shouldInsertModule    bool
		insertModuleBeforeMVS bool
		status                int
		wantUpsertMVSError    bool
		wantMVSStatus         int
		wantModulesStatus     int
	}{
		{
			name:                  "upsert mvs without inserting module, status 200",
			shouldInsertModule:    false,
			insertModuleBeforeMVS: false,
			status:                http.StatusOK,
			wantUpsertMVSError:    false,
			wantMVSStatus:         http.StatusOK,
			wantModulesStatus:     0,
		},
		{
			name:                  "upsert mvs without inserting module, status 400",
			shouldInsertModule:    false,
			insertModuleBeforeMVS: false,
			status:                http.StatusBadRequest,
			wantUpsertMVSError:    false,
			wantMVSStatus:         http.StatusBadRequest,
			wantModulesStatus:     0,
		},
		{
			name:                  "upsert mvs after inserting module, status 200",
			shouldInsertModule:    true,
			insertModuleBeforeMVS: true,
			status:                http.StatusOK,
			wantUpsertMVSError:    false,
			wantMVSStatus:         http.StatusOK,
			wantModulesStatus:     http.StatusOK,
		},
		{
			name:                  "upsert mvs after inserting module, status 400",
			shouldInsertModule:    true,
			insertModuleBeforeMVS: true,
			status:                http.StatusBadRequest,
			wantUpsertMVSError:    false,
			wantMVSStatus:         http.StatusBadRequest,
			wantModulesStatus:     http.StatusBadRequest,
		},
		{
			name:                  "upsert mvs before inserting module, status 200",
			shouldInsertModule:    true,
			insertModuleBeforeMVS: false,
			status:                http.StatusOK,
			wantUpsertMVSError:    false,
			wantMVSStatus:         http.StatusOK,
			wantModulesStatus:     0,
		},
	} {
		t.Run(test.name, func(t *testing.T) {
			defer ResetTestDB(testDB, t)

			if test.insertModuleBeforeMVS && test.shouldInsertModule {
				if err := testDB.InsertModule(ctx, m); err != nil {
					t.Fatalf("testDB.InsertModule(): %v", err)
				}
			}

			err := testDB.UpsertModuleVersionState(ctx, m.ModulePath, m.Version, appVersion, time.Now(), test.status, "", nil, nil)
			if test.wantUpsertMVSError != (err != nil) {
				t.Fatalf("db.UpsertModuleVersionState(): %v, want error: %t", err, test.wantUpsertMVSError)
			}
			mvs, err := testDB.GetModuleVersionState(ctx, m.ModulePath, m.Version)
			if err != nil {
				t.Fatalf("db.GetModuleVersionState(): %v", err)
			}
			if mvs.Status != test.wantMVSStatus {
				t.Errorf("module_version_states.status = %d, want %d", mvs.Status, test.wantMVSStatus)
			}

			if !test.insertModuleBeforeMVS && test.shouldInsertModule {
				if err := testDB.InsertModule(ctx, m); err != nil {
					t.Fatalf("testDB.InsertModule(): %v", err)
				}
			}

			if !test.shouldInsertModule {
				return
			}

			var gotStatus sql.NullInt64
			err = testDB.db.QueryRow(ctx, `
                    SELECT status
                    FROM modules
                    WHERE module_path = $1 AND version = $2;`,
				m.ModulePath, m.Version).Scan(&gotStatus)
			if err != nil {
				t.Fatalf("db.QueryRow(): %v", err)
			}
			if test.insertModuleBeforeMVS != gotStatus.Valid {
				t.Fatalf("modules.Status = %+v, want status: %t", gotStatus, test.insertModuleBeforeMVS)
			}
			if int(gotStatus.Int64) != test.wantModulesStatus {
				t.Errorf("modules.status = %d, want %d", gotStatus.Int64, test.wantModulesStatus)
			}
		})
	}

}