package enrichment

import (
	"context"
	"log/slog"
	"os"
	"testing"

	"github.com/git-pkgs/purl"
	"github.com/git-pkgs/vulns"
)

type recordingVulnerabilitySource struct {
	purls []*purl.PURL
}

func (s *recordingVulnerabilitySource) Name() string {
	return "recording"
}

func (s *recordingVulnerabilitySource) Query(context.Context, *purl.PURL) ([]vulns.Vulnerability, error) {
	return nil, nil
}

func (s *recordingVulnerabilitySource) QueryBatch(_ context.Context, purls []*purl.PURL) ([][]vulns.Vulnerability, error) {
	s.purls = purls
	results := make([][]vulns.Vulnerability, len(purls))
	for i := range results {
		results[i] = []vulns.Vulnerability{{ID: "TEST-1"}}
	}
	return results, nil
}

func (s *recordingVulnerabilitySource) Get(context.Context, string) (*vulns.Vulnerability, error) {
	return nil, nil
}

func TestNew(t *testing.T) {
	logger := slog.New(slog.NewTextHandler(os.Stdout, nil))
	svc := New(logger)

	if svc == nil {
		t.Fatal("New() returned nil")
	}

	if svc.regClient == nil {
		t.Error("regClient is nil")
	}

	if svc.vulnSource == nil {
		t.Error("vulnSource is nil")
	}
}

func TestSwiftRegistryIdentitySkipsPURLDependentLookups(t *testing.T) {
	svc := New(slog.New(slog.NewTextHandler(os.Stdout, nil)))
	ctx := context.Background()

	packageInfo, err := svc.EnrichPackage(ctx, "swift", "apple/example")
	if err != nil || packageInfo != nil {
		t.Errorf("EnrichPackage() = %#v, %v; want nil, nil", packageInfo, err)
	}

	versionInfo, err := svc.EnrichVersion(ctx, "swift", "apple/example", "1.2.3")
	if err != nil || versionInfo != nil {
		t.Errorf("EnrichVersion() = %#v, %v; want nil, nil", versionInfo, err)
	}

	vulnerabilities, err := svc.CheckVulnerabilities(ctx, "swift", "apple/example", "1.2.3")
	if err != nil || vulnerabilities != nil {
		t.Errorf("CheckVulnerabilities() = %#v, %v; want nil, nil", vulnerabilities, err)
	}

	latest, err := svc.GetLatestVersion(ctx, "swift", "apple/example")
	if err != nil || latest != "" {
		t.Errorf("GetLatestVersion() = %q, %v; want empty string, nil", latest, err)
	}

	packages := []struct{ Ecosystem, Name string }{{Ecosystem: "swift", Name: "apple/example"}}
	if got := svc.BulkEnrichPackages(ctx, packages); len(got) != 0 {
		t.Errorf("BulkEnrichPackages() = %#v, want empty result", got)
	}

	versions := []struct{ Ecosystem, Name, Version string }{
		{Ecosystem: "swift", Name: "apple/example", Version: "1.2.3"},
	}
	got, err := svc.BulkCheckVulnerabilities(ctx, versions)
	if err != nil || len(got) != 0 {
		t.Errorf("BulkCheckVulnerabilities() = %#v, %v; want empty result, nil", got, err)
	}
}

func TestBulkCheckVulnerabilitiesFiltersUnsupportedPackageIdentities(t *testing.T) {
	source := &recordingVulnerabilitySource{}
	svc := New(slog.New(slog.NewTextHandler(os.Stdout, nil)))
	svc.vulnSource = source
	packages := []struct{ Ecosystem, Name, Version string }{
		{Ecosystem: "swift", Name: "apple/example", Version: "1.2.3"},
		{Ecosystem: "npm", Name: "lodash", Version: "4.17.21"},
	}

	got, err := svc.BulkCheckVulnerabilities(context.Background(), packages)
	if err != nil {
		t.Fatalf("BulkCheckVulnerabilities() error = %v", err)
	}
	if len(source.purls) != 1 || source.purls[0].String() != "pkg:npm/lodash@4.17.21" {
		t.Fatalf("queried PURLs = %#v, want only lodash", source.purls)
	}
	if len(got["pkg:npm/lodash@4.17.21"]) != 1 {
		t.Errorf("result = %#v, want lodash vulnerability", got)
	}
	if _, exists := got[""]; exists {
		t.Error("result contains an empty PURL key")
	}
}

func TestIsOutdated(t *testing.T) {
	logger := slog.New(slog.NewTextHandler(os.Stdout, nil))
	svc := New(logger)

	tests := []struct {
		current  string
		latest   string
		expected bool
	}{
		{"1.0.0", "2.0.0", true},
		{"2.0.0", "2.0.0", false},
		{"2.0.0", "1.0.0", false},
		{"1.0.0", "", false},
		{"", "2.0.0", false},
		{"1.2.3", "1.2.4", true},
		{"1.2.4", "1.2.3", false},
	}

	for _, tc := range tests {
		result := svc.IsOutdated(tc.current, tc.latest)
		if result != tc.expected {
			t.Errorf("IsOutdated(%q, %q) = %v, want %v", tc.current, tc.latest, result, tc.expected)
		}
	}
}

func TestCategorizeLicense(t *testing.T) {
	logger := slog.New(slog.NewTextHandler(os.Stdout, nil))
	svc := New(logger)

	tests := []struct {
		license  string
		expected LicenseCategory
	}{
		{"MIT", LicensePermissive},
		{"Apache-2.0", LicensePermissive},
		{"BSD-3-Clause", LicensePermissive},
		{"GPL-3.0", LicenseCopyleft},
		{"AGPL-3.0", LicenseCopyleft},
		{"LGPL-2.1", LicenseCopyleft},
		{"", LicenseUnknown},
		{"Unknown", LicenseUnknown},
	}

	for _, tc := range tests {
		result := svc.CategorizeLicense(tc.license)
		if result != tc.expected {
			t.Errorf("CategorizeLicense(%q) = %v, want %v", tc.license, result, tc.expected)
		}
	}
}

func TestNormalizeLicense(t *testing.T) {
	logger := slog.New(slog.NewTextHandler(os.Stdout, nil))
	svc := New(logger)

	tests := []struct {
		input    string
		expected string
	}{
		{"MIT", "MIT"},
		{"Apache 2", "Apache-2.0"},
		{"Apache-2.0", "Apache-2.0"},
		{"", ""},
	}

	for _, tc := range tests {
		result := svc.NormalizeLicense(tc.input)
		if result != tc.expected {
			t.Errorf("NormalizeLicense(%q) = %q, want %q", tc.input, result, tc.expected)
		}
	}
}