package automation

import (
	"reflect"
	"testing"
)

func TestParsePath(t *testing.T) {
	cases := map[string][]pathStep{
		"dns.nameserver":          {mapKeyStep{"dns"}, mapKeyStep{"nameserver"}},
		"rules":                   {mapKeyStep{"rules"}},
		"proxy-groups[0].proxies": {mapKeyStep{"proxy-groups"}, indexStep{0}, mapKeyStep{"proxies"}},
		"a[0][1]":                 {mapKeyStep{"a"}, indexStep{0}, indexStep{1}},
	}
	for path, want := range cases {
		got, err := parsePath(path)
		if err != nil {
			t.Fatalf("parsePath(%q) error = %v", path, err)
		}
		if !reflect.DeepEqual(got, want) {
			t.Fatalf("parsePath(%q) = %#v, want %#v", path, got, want)
		}
	}
}

func TestParsePath_Invalid(t *testing.T) {
	for _, path := range []string{"", "a..b", "a.[b]"} {
		if _, err := parsePath(path); err == nil {
			t.Fatalf("parsePath(%q): expected error, got nil", path)
		}
	}
}

func TestApplyPatch_ReplaceExistingKey(t *testing.T) {
	root := map[string]interface{}{
		"dns": map[string]interface{}{
			"nameserver": []interface{}{"114.114.114.114"},
		},
	}
	err := applyPatch(root, PatchRule{Path: "dns.nameserver", Op: "replace", Value: []interface{}{"1.1.1.1"}})
	if err != nil {
		t.Fatalf("applyPatch() error = %v", err)
	}
	dns := root["dns"].(map[string]interface{})
	if !reflect.DeepEqual(dns["nameserver"], []interface{}{"1.1.1.1"}) {
		t.Fatalf("got %#v", dns["nameserver"])
	}
}

func TestApplyPatch_AppendToList(t *testing.T) {
	root := map[string]interface{}{
		"rules": []interface{}{"MATCH,DIRECT"},
	}
	err := applyPatch(root, PatchRule{Path: "rules", Op: "append", Value: []interface{}{"DOMAIN,foo.com,PROXY"}})
	if err != nil {
		t.Fatalf("applyPatch() error = %v", err)
	}
	want := []interface{}{"MATCH,DIRECT", "DOMAIN,foo.com,PROXY"}
	if !reflect.DeepEqual(root["rules"], want) {
		t.Fatalf("got %#v, want %#v", root["rules"], want)
	}
}

func TestApplyPatch_PrependToList(t *testing.T) {
	root := map[string]interface{}{
		"rules": []interface{}{"MATCH,DIRECT"},
	}
	err := applyPatch(root, PatchRule{Path: "rules", Op: "prepend", Value: "DOMAIN,foo.com,PROXY"})
	if err != nil {
		t.Fatalf("applyPatch() error = %v", err)
	}
	want := []interface{}{"DOMAIN,foo.com,PROXY", "MATCH,DIRECT"}
	if !reflect.DeepEqual(root["rules"], want) {
		t.Fatalf("got %#v, want %#v", root["rules"], want)
	}
}

func TestApplyPatch_AutoVivifyIntermediateMaps(t *testing.T) {
	root := map[string]interface{}{}
	err := applyPatch(root, PatchRule{Path: "dns.nameserver", Op: "replace", Value: []interface{}{"1.1.1.1"}})
	if err != nil {
		t.Fatalf("applyPatch() error = %v", err)
	}
	dns, ok := root["dns"].(map[string]interface{})
	if !ok {
		t.Fatalf("expected dns to be auto-created as a map, got %#v", root["dns"])
	}
	if !reflect.DeepEqual(dns["nameserver"], []interface{}{"1.1.1.1"}) {
		t.Fatalf("got %#v", dns["nameserver"])
	}
}

func TestApplyPatch_AppendCreatesMissingKey(t *testing.T) {
	root := map[string]interface{}{}
	err := applyPatch(root, PatchRule{Path: "rules", Op: "append", Value: []interface{}{"MATCH,DIRECT"}})
	if err != nil {
		t.Fatalf("applyPatch() error = %v", err)
	}
	if !reflect.DeepEqual(root["rules"], []interface{}{"MATCH,DIRECT"}) {
		t.Fatalf("got %#v", root["rules"])
	}
}

func TestApplyPatch_IndexIntoList(t *testing.T) {
	root := map[string]interface{}{
		"proxy-groups": []interface{}{
			map[string]interface{}{"name": "g1", "proxies": []interface{}{"DIRECT"}},
		},
	}
	err := applyPatch(root, PatchRule{Path: "proxy-groups[0].proxies", Op: "prepend", Value: []interface{}{"REJECT"}})
	if err != nil {
		t.Fatalf("applyPatch() error = %v", err)
	}
	groups := root["proxy-groups"].([]interface{})
	g0 := groups[0].(map[string]interface{})
	want := []interface{}{"REJECT", "DIRECT"}
	if !reflect.DeepEqual(g0["proxies"], want) {
		t.Fatalf("got %#v, want %#v", g0["proxies"], want)
	}
}

func TestApplyPatch_IndexOutOfRange(t *testing.T) {
	root := map[string]interface{}{"proxy-groups": []interface{}{}}
	err := applyPatch(root, PatchRule{Path: "proxy-groups[0].proxies", Op: "replace", Value: []interface{}{}})
	if err == nil {
		t.Fatal("expected out-of-range error, got nil")
	}
}

func TestApplyPatch_MergeIntoMap(t *testing.T) {
	root := map[string]interface{}{
		"dns": map[string]interface{}{"enable": true, "listen": "0.0.0.0:53"},
	}
	err := applyPatch(root, PatchRule{
		Path: "dns",
		Op:   "append",
		Value: map[string]interface{}{
			"listen":        "127.0.0.1:53",
			"enhanced-mode": "fake-ip",
		},
	})
	if err != nil {
		t.Fatalf("applyPatch() error = %v", err)
	}
	dns := root["dns"].(map[string]interface{})
	if dns["enable"] != true || dns["listen"] != "127.0.0.1:53" || dns["enhanced-mode"] != "fake-ip" {
		t.Fatalf("got %#v", dns)
	}
}

func TestApplyPatch_UnknownOp(t *testing.T) {
	root := map[string]interface{}{"rules": []interface{}{}}
	if err := applyPatch(root, PatchRule{Path: "rules", Op: "delete", Value: nil}); err == nil {
		t.Fatal("expected error for unknown op, got nil")
	}
}

func TestApplyPatch_AppendToScalarErrors(t *testing.T) {
	root := map[string]interface{}{"mode": "rule"}
	if err := applyPatch(root, PatchRule{Path: "mode", Op: "append", Value: "x"}); err == nil {
		t.Fatal("expected error appending to a scalar, got nil")
	}
}