// Copyright 2023 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 database

import (
	"testing"
	"time"

	"github.com/google/go-cmp/cmp"
	"golang.org/x/vuln/osv"
)

var (
	jan1999  = time.Date(1999, 1, 1, 0, 0, 0, 0, time.UTC)
	jan2000  = time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC)
	jan2002  = time.Date(2002, 1, 1, 0, 0, 0, 0, time.UTC)
	jan2003  = time.Date(2003, 1, 1, 0, 0, 0, 0, time.UTC)
	testOSV1 = osv.Entry{
		ID:        "GO-1999-0001",
		Published: jan1999,
		Modified:  jan2000,
		Aliases:   []string{"CVE-1999-1111"},
		Details:   "Some details",
		Affected: []osv.Affected{
			{
				Package: osv.Package{
					Name:      "stdlib",
					Ecosystem: "Go",
				},
				Ranges: osv.Affects{
					osv.AffectsRange{
						Type: "SEMVER",
						Events: []osv.RangeEvent{
							{Introduced: "0"}, {Fixed: "1.1.0"},
							{Introduced: "1.2.0"},
							{Fixed: "1.2.2"},
						}}},
				DatabaseSpecific: osv.DatabaseSpecific{
					URL: "https://pkg.go.dev/vuln/GO-1999-0001"},
				EcosystemSpecific: osv.EcosystemSpecific{
					Imports: []osv.EcosystemSpecificImport{{Path: "package", Symbols: []string{"Symbol"}}}}},
		},
		References: []osv.Reference{
			{Type: "FIX", URL: "https://example.com/cl/123"},
		}}
	testOSV2 = osv.Entry{
		ID:        "GO-2000-0002",
		Published: jan2000,
		Modified:  jan2002,
		Aliases:   []string{"CVE-1999-2222"},
		Details:   "Some details",
		Affected: []osv.Affected{
			{
				Package: osv.Package{
					Name:      "example.com/module",
					Ecosystem: "Go",
				},
				Ranges: osv.Affects{
					osv.AffectsRange{
						Type: "SEMVER", Events: []osv.RangeEvent{{Introduced: "0"},
							{Fixed: "1.2.0"},
						}}},
				DatabaseSpecific: osv.DatabaseSpecific{URL: "https://pkg.go.dev/vuln/GO-2000-0002"}, EcosystemSpecific: osv.EcosystemSpecific{
					Imports: []osv.EcosystemSpecificImport{{Path: "example.com/module/package",
						Symbols: []string{"Symbol"},
					}}}}},
		References: []osv.Reference{
			{Type: "FIX", URL: "https://example.com/cl/543"},
		}}
	testOSV3 = osv.Entry{
		ID:        "GO-2000-0003",
		Published: jan2000,
		Modified:  jan2003,
		Aliases:   []string{"CVE-1999-3333", "GHSA-xxxx-yyyy-zzzz"},
		Details:   "Some details",
		Affected: []osv.Affected{
			{
				Package: osv.Package{
					Name:      "example.com/module",
					Ecosystem: "Go",
				},
				Ranges: osv.Affects{
					osv.AffectsRange{
						Type: "SEMVER",
						Events: []osv.RangeEvent{
							{Introduced: "0"}, {Fixed: "1.1.0"},
						}}},
				DatabaseSpecific: osv.DatabaseSpecific{
					URL: "https://pkg.go.dev/vuln/GO-2000-0003",
				},
				EcosystemSpecific: osv.EcosystemSpecific{Imports: []osv.EcosystemSpecificImport{
					{
						Path:    "example.com/module/package",
						Symbols: []string{"Symbol"},
					}}}}},
		References: []osv.Reference{
			{Type: "FIX", URL: "https://example.com/cl/000"},
		}}
	valid = &Database{
		DB: DBMeta{Modified: Time{jan2003}},
		Modules: ModulesIndex{
			"example.com/module": &Module{Path: "example.com/module", Vulns: []ModuleVuln{{ID: "GO-2000-0002", Modified: Time{jan2002}, Fixed: "1.2.0"}, {ID: "GO-2000-0003", Modified: Time{jan2003}, Fixed: "1.1.0"}}}, "stdlib": &Module{Path: "stdlib", Vulns: []ModuleVuln{{ID: "GO-1999-0001", Modified: Time{jan2000}, Fixed: "1.2.2"}}},
		},
		Vulns: VulnsIndex{
			"GO-1999-0001": &Vuln{ID: "GO-1999-0001", Modified: Time{jan2000}, Aliases: []string{"CVE-1999-1111"}}, "GO-2000-0002": &Vuln{ID: "GO-2000-0002", Modified: Time{jan2002}, Aliases: []string{"CVE-1999-2222"}}, "GO-2000-0003": &Vuln{ID: "GO-2000-0003", Modified: Time{jan2003}, Aliases: []string{"CVE-1999-3333", "GHSA-xxxx-yyyy-zzzz"}},
		},
		Entries: []osv.Entry{testOSV1, testOSV2, testOSV3}}
)

func TestNew(t *testing.T) {
	got, err := New(testOSV1, testOSV2, testOSV3)
	if err != nil {
		t.Fatal(err)
	}
	want := valid
	if diff := cmp.Diff(want, got); diff != "" {
		t.Errorf("New: unexpected diff (-want, +got):\n%v", diff)
	}
}

func TestLatestFixedVerion(t *testing.T) {
	tests := []struct {
		name   string
		ranges []osv.AffectsRange
		want   string
	}{
		{
			name:   "empty",
			ranges: []osv.AffectsRange{},
			want:   "",
		},
		{
			name: "no fix",
			ranges: []osv.AffectsRange{{
				Type: osv.TypeSemver,
				Events: []osv.RangeEvent{
					{
						Introduced: "0",
					},
				},
			}},
			want: "",
		},
		{
			name: "unsorted",
			ranges: []osv.AffectsRange{{
				Type: osv.TypeSemver,
				Events: []osv.RangeEvent{
					{
						Fixed: "1.0.0",
					},
					{
						Introduced: "0",
					},
					{
						Fixed: "0.1.0",
					},
					{
						Introduced: "0.5.0",
					},
				},
			}},
			want: "1.0.0",
		},
		{
			name: "multiple ranges",
			ranges: []osv.AffectsRange{{
				Type: osv.TypeSemver,
				Events: []osv.RangeEvent{
					{
						Introduced: "0",
					},
					{
						Fixed: "0.1.0",
					},
				},
			},
				{
					Type: osv.TypeSemver,
					Events: []osv.RangeEvent{
						{
							Introduced: "0",
						},
						{
							Fixed: "0.2.0",
						},
					},
				}},
			want: "0.2.0",
		},
		{
			name: "pseudoversion",
			ranges: []osv.AffectsRange{{
				Type: osv.TypeSemver,
				Events: []osv.RangeEvent{
					{
						Introduced: "0",
					},
					{
						Fixed: "0.0.0-20220824120805-abc",
					},
					{
						Introduced: "0.0.0-20230824120805-efg",
					},
					{
						Fixed: "0.0.0-20240824120805-hij",
					},
				},
			}},
			want: "0.0.0-20240824120805-hij",
		},
	}

	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			latestFixedVersion(test.ranges)
		})
	}
}