// Copyright 2020 The LUCI 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 build

import (
	"context"
	"testing"

	. "github.com/smartystreets/goconvey/convey"

	"go.chromium.org/luci/common/logging"
	"go.chromium.org/luci/common/logging/memlogger"
	. "go.chromium.org/luci/common/testing/assertions"
	"go.chromium.org/luci/luciexe/build/internal/testpb"
)

func TestPropertiesNoop(t *testing.T) {
	// Intentionally forgo t.Parallel() due to global reservation structures.

	Convey(`Properties Noop`, t, func() {
		// reset `reservations` after each test
		defer propReaderReservations.clear()
		defer propModifierReservations.clear()

		Convey(`MakePropertyReader`, func() {
			Convey(`simple`, func() {
				var fn func(context.Context) *testpb.Module
				MakePropertyReader("ns", &fn)

				So(fn, ShouldNotBeNil)

				msg := fn(context.Background())
				So(msg, ShouldBeNil)
			})

			Convey(`bad args`, func() {
				Convey(`empty ns`, func() {
					var fn func(context.Context) *testpb.Module
					So(func() {
						MakePropertyReader("", &fn)
					}, ShouldPanicLike, "empty namespace not allowed")
				})

				Convey(`duplicate namespace`, func() {
					var fn func(context.Context) *testpb.Module
					MakePropertyReader("ns", &fn)

					So(func() {
						MakePropertyReader("ns", &fn)
					}, ShouldPanicLike, "cannot reserve PropertyReader namespace")
				})

				Convey(`not pointer`, func() {
					var fn func(context.Context) *testpb.Module
					So(func() {
						MakePropertyReader("ns", fn)
					}, ShouldPanicLike, "fnptr is not")
				})

				Convey(`not function`, func() {
					var fn int
					So(func() {
						MakePropertyReader("ns", &fn)
					}, ShouldPanicLike, "fnptr is not")
				})

				Convey(`bad in arg count`, func() {
					var fn func()
					So(func() {
						MakePropertyReader("ns", &fn)
					}, ShouldPanicLike, "fnptr is not")
				})

				Convey(`bad out arg count`, func() {
					var fn func(context.Context)
					So(func() {
						MakePropertyReader("ns", &fn)
					}, ShouldPanicLike, "fnptr is not")
				})

				Convey(`bad in arg type`, func() {
					var fn func(int)
					So(func() {
						MakePropertyReader("ns", &fn)
					}, ShouldPanicLike, "fnptr is not")
				})

				Convey(`bad proto type`, func() {
					// testpb.Module doesn't implement proto.Message (missing *)
					var fn func(context.Context) testpb.Module
					So(func() {
						MakePropertyReader("ns", &fn)
					}, ShouldPanicLike, "fnptr is not")
				})
			})
		})

		Convey(`MakePropertyModifier`, func() {
			ctx := memlogger.Use(context.Background())
			logs := logging.Get(ctx).(*memlogger.MemLogger)

			Convey(`working`, func() {
				var writer func(context.Context, *testpb.Module)
				var merger func(context.Context, *testpb.Module)
				So(func() {
					MakePropertyModifier("ns", &writer, &merger)
				}, ShouldNotPanic)

				Convey(`write nil`, func() {
					writer(ctx, nil)
					So(logs.Messages(), ShouldBeEmpty)
				})

				Convey(`merge nil`, func() {
					merger(ctx, nil)
					So(logs.Messages(), ShouldBeEmpty)
				})

				Convey(`write msg`, func() {
					writer(ctx, &testpb.Module{Field: "hidey-ho"})
					So(logs, memlogger.ShouldHaveLog, logging.Info,
						"writing output property \"ns\": \"{\\\"field\\\":\\\"hidey-ho\\\"}\"")
				})

				Convey(`merge msg`, func() {
					merger(ctx, &testpb.Module{Field: "hidey-ho"})
					So(logs, memlogger.ShouldHaveLog, logging.Info, "merging output property \"ns\"")
				})
			})
		})
	})
}