/*
   Copyright Docker attest authors

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/

package policy_test

import (
	"context"
	"testing"

	"github.com/docker/attest/internal/test"
	"github.com/docker/attest/policy"
	"github.com/docker/attest/tuf"
	v1 "github.com/google/go-containerregistry/pkg/v1"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func TestResolvePolicy(t *testing.T) {
	localPolicyPath := "testdata/policies/allow"
	tufPolicyPath := "testdata/policies/allow-canonical"
	noLocalPolicyPath := "testdata/policies/no-policy"
	testPolicyID := "docker-official-images"
	testImageName := "localhost:5001/test/repo:tag"
	defaultPlatform, err := v1.ParsePlatform("linux/amd64")
	require.NoError(t, err)
	testCases := []struct {
		name              string
		policyPath        string
		policyID          string
		localOverridesTUF bool // if a policy is provided locally, it should override TUF
		DisableTUF        bool
	}{
		{name: "resolve by id (TUF only)", policyID: testPolicyID, DisableTUF: false},
		{name: "resolve by id (local mapping, TUF policy)", policyPath: noLocalPolicyPath, policyID: testPolicyID, DisableTUF: false},
		{name: "resolve by id (local mapping, local policy, no TUF)", policyPath: localPolicyPath, policyID: testPolicyID, DisableTUF: true},
		{name: "resolve by id (local mapping, local policy)", policyPath: localPolicyPath, policyID: testPolicyID, DisableTUF: false, localOverridesTUF: true},
		{name: "resolve by match (TUF only)", DisableTUF: false},
		{name: "resolve by match (local mapping, TUF policy)", policyPath: noLocalPolicyPath, DisableTUF: false},
		{name: "resolve by match (local mapping, local policy, no TUF)", policyPath: localPolicyPath, DisableTUF: true},
		{name: "resolve by match (local mapping, local policy)", policyPath: localPolicyPath, DisableTUF: false, localOverridesTUF: true},
	}

	var tufClient tuf.Downloader
	for _, tc := range testCases {
		t.Run(tc.name, func(t *testing.T) {
			opts := &policy.Options{}
			tempDir := test.CreateTempDir(t, "", "tuf-dest")
			if !tc.DisableTUF {
				tufClient = tuf.NewMockTufClient(tufPolicyPath)
			}
			if tc.policyID != "" {
				opts.PolicyID = tc.policyID
			}
			if tc.policyPath != "" {
				opts.LocalPolicyDir = tc.policyPath
			}
			opts.DisableTUF = tc.DisableTUF
			opts.LocalTargetsDir = tempDir
			resolver := policy.NewResolver(tufClient, opts)
			policy, err := resolver.ResolvePolicy(context.Background(), testImageName, defaultPlatform)
			require.NoError(t, err)
			assert.NotNil(t, policy)
			if tc.DisableTUF || tc.localOverridesTUF {
				assert.Contains(t, policy.URI, localPolicyPath)
			} else {
				assert.Contains(t, policy.URI, tufPolicyPath)
			}
		})
	}
}