package noop

import (
	"context"
	"reflect"
	"testing"

	"gitea.maximumdirect.net/eric/notarius/internal/framework/contracts"
	"gitea.maximumdirect.net/eric/notarius/internal/framework/pipeline"
)

func TestModuleSpecAndRegister(t *testing.T) {
	want := pipeline.ModuleSpec{
		Key:      Key,
		Stage:    pipeline.StageNormalize,
		Requires: []string{"merged"},
		Provides: []string{"normalized"},
	}
	if got := ModuleSpec(); !reflect.DeepEqual(got, want) {
		t.Fatalf("ModuleSpec() = %#v, want %#v", got, want)
	}

	registry := pipeline.NewNormalizerRegistry()
	if err := Register(registry); err != nil {
		t.Fatalf("Register() error = %v, want nil", err)
	}
	spec, ok := registry.Spec(Key)
	if !ok {
		t.Fatalf("Spec(%q) ok = false, want true", Key)
	}
	if !reflect.DeepEqual(spec, want) {
		t.Fatalf("registered spec = %#v, want %#v", spec, want)
	}
	normalizer, err := registry.Build(Key)
	if err != nil {
		t.Fatalf("Build(%q) error = %v, want nil", Key, err)
	}
	if slots := normalizer.ReferenceSlots(); len(slots) != 0 {
		t.Fatalf("ReferenceSlots() = %#v, want none", slots)
	}
}

func TestNormalizePassesThroughMergeOutput(t *testing.T) {
	input := mergeOutput(`{"name":"original"}`)

	result, err := New().Normalize(context.Background(), contracts.NormalizeRequest{
		LaneID:      "events",
		MergeOutput: input,
	})
	if err != nil {
		t.Fatalf("Normalize() error = %v, want nil", err)
	}

	if result.Output.LaneID != "events" || result.Output.NormalizerKey != Key {
		t.Fatalf("output provenance = %#v, want lane and normalizer", result.Output)
	}
	if string(result.Output.Payload.Content) != `{"name":"original"}` {
		t.Fatalf("content = %s, want original content", result.Output.Payload.Content)
	}
	if result.Output.Payload.Metadata["name"] != "original" {
		t.Fatalf("metadata = %#v, want original metadata", result.Output.Payload.Metadata)
	}
}

func TestNormalizeDefensivelyCopiesRawPayload(t *testing.T) {
	input := mergeOutput(`{"name":"original"}`)

	result, err := New().Normalize(context.Background(), contracts.NormalizeRequest{
		LaneID:      "events",
		MergeOutput: input,
	})
	if err != nil {
		t.Fatalf("Normalize() error = %v, want nil", err)
	}

	input.Payload.Content[0] = '['
	input.Payload.Metadata["name"] = "changed"

	if string(result.Output.Payload.Content) != `{"name":"original"}` {
		t.Fatalf("content changed after input mutation: %s", result.Output.Payload.Content)
	}
	if result.Output.Payload.Metadata["name"] != "original" {
		t.Fatalf("metadata changed after input mutation: %#v", result.Output.Payload.Metadata)
	}
}

func mergeOutput(content string) contracts.MergeOutput {
	return contracts.MergeOutput{
		LaneID:    "events",
		MergerKey: "merge",
		SourceID:  "source-1",
		Schema:    contracts.ResponseSchema{ID: "schema-id", Name: "schema-name", Version: "v1"},
		Payload: contracts.RawPayload{
			Content:   []byte(content),
			MediaType: "application/json",
			Metadata:  map[string]any{"name": "original"},
		},
	}
}