// Copyright (c) The OpenTofu Authors
// SPDX-License-Identifier: MPL-2.0
// Copyright (c) 2023 HashiCorp, Inc.
// SPDX-License-Identifier: MPL-2.0

package tofu

import (
	"strings"
	"testing"

	"github.com/google/go-cmp/cmp"
	"github.com/opentofu/opentofu/internal/addrs"
)

func TestConfigTransformer_nilModule(t *testing.T) {
	g := Graph{Path: addrs.RootModuleInstance}
	tf := &ConfigTransformer{}
	if err := tf.Transform(t.Context(), &g); err != nil {
		t.Fatalf("err: %s", err)
	}

	if len(g.Vertices()) > 0 {
		t.Fatalf("graph is not empty: %s", g.String())
	}
}

func TestConfigTransformer(t *testing.T) {
	g := Graph{Path: addrs.RootModuleInstance}
	tf := &ConfigTransformer{Config: testModule(t, "graph-basic")}
	if err := tf.Transform(t.Context(), &g); err != nil {
		t.Fatalf("err: %s", err)
	}

	actual := strings.TrimSpace(g.String())
	expected := strings.TrimSpace(testConfigTransformerGraphBasicStr)
	if actual != expected {
		t.Fatalf("bad:\n\n%s", actual)
	}
}

func TestConfigTransformer_mode(t *testing.T) {
	cases := map[string]struct {
		filterFunc    func(mode addrs.ResourceMode) bool
		expectedGraph string
	}{
		"no filter": {
			filterFunc: nil,
			expectedGraph: `aws_instance.web
data.aws_ami.foo
ephemeral.aws_secret.secret`,
		},
		"allow all": {
			filterFunc: func(mode addrs.ResourceMode) bool {
				return false
			},
			expectedGraph: `aws_instance.web
data.aws_ami.foo
ephemeral.aws_secret.secret`,
		},
		"only managed resources": {
			filterFunc: func(mode addrs.ResourceMode) bool {
				return mode != addrs.ManagedResourceMode
			},
			expectedGraph: `aws_instance.web`,
		},
		"only data sources": {
			filterFunc: func(mode addrs.ResourceMode) bool {
				return mode != addrs.DataResourceMode
			},
			expectedGraph: `data.aws_ami.foo`,
		},
		"only ephemeral resources": {
			filterFunc: func(mode addrs.ResourceMode) bool {
				return mode != addrs.EphemeralResourceMode
			},
			expectedGraph: `ephemeral.aws_secret.secret`,
		},
	}
	for name, tt := range cases {
		t.Run(name, func(t *testing.T) {
			g := Graph{Path: addrs.RootModuleInstance}
			tf := &ConfigTransformer{
				Config:     testModule(t, "transform-config-mode-data"),
				ModeFilter: tt.filterFunc,
			}
			if err := tf.Transform(t.Context(), &g); err != nil {
				t.Fatalf("err: %s", err)
			}

			actual := strings.TrimSpace(g.String())
			expected := strings.TrimSpace(tt.expectedGraph)
			if diff := cmp.Diff(expected, actual); diff != "" {
				t.Errorf("wrong graph:\n\n%s", diff)
			}
		})
	}
}

func TestConfigTransformer_nonUnique(t *testing.T) {
	g := Graph{Path: addrs.RootModuleInstance}
	g.Add(NewNodeAbstractResource(
		addrs.RootModule.Resource(
			addrs.ManagedResourceMode, "aws_instance", "web",
		),
	))
	tf := &ConfigTransformer{Config: testModule(t, "graph-basic")}
	if err := tf.Transform(t.Context(), &g); err != nil {
		t.Fatalf("err: %s", err)
	}

	actual := strings.TrimSpace(g.String())
	expected := strings.TrimSpace(`
aws_instance.web
aws_instance.web
aws_load_balancer.weblb
aws_security_group.firewall
openstack_floating_ip.random
`)
	if actual != expected {
		t.Fatalf("bad:\n\n%s", actual)
	}
}

const testConfigTransformerGraphBasicStr = `
aws_instance.web
aws_load_balancer.weblb
aws_security_group.firewall
openstack_floating_ip.random
`
