package pipeline_test

import (
	"context"
	"encoding/json"
	"testing"

	"gitea.maximumdirect.net/eric/notarius/internal/core/config"
	"gitea.maximumdirect.net/eric/notarius/internal/core/source"
	"gitea.maximumdirect.net/eric/notarius/internal/framework/contracts"
	"gitea.maximumdirect.net/eric/notarius/internal/framework/pipeline"
	"gitea.maximumdirect.net/eric/notarius/internal/modules/generic/chunk/units"
	"gitea.maximumdirect.net/eric/notarius/internal/modules/generic/merge/appendorder"
	"gitea.maximumdirect.net/eric/notarius/internal/modules/generic/normalize/noop"
	jsonoutput "gitea.maximumdirect.net/eric/notarius/internal/modules/generic/output/json"
)

func TestPipelineConfigResolvesWithProductionDefaultsRegistered(t *testing.T) {
	cfg := config.Default()
	cfg.Pipelines = map[string]pipeline.PipelineProfile{
		"defaults": {
			Input: pipeline.Binding("input"),
			Artifacts: map[string]pipeline.ArtifactLaneProfile{
				"events": {Extract: pipeline.Binding("extract")},
			},
		},
	}

	resolved, err := cfg.Resolve(config.ResolveInput{
		PipelineID: "defaults",
		Catalog:    defaultModuleCatalog(t),
	})
	if err != nil {
		t.Fatalf("Resolve() error = %v, want nil", err)
	}

	pipeline := resolved.ResolvedPipeline
	if pipeline.Chunk.Module != units.Key {
		t.Fatalf("Chunk.Module = %q, want %q", pipeline.Chunk.Module, units.Key)
	}
	if pipeline.Output.Module != jsonoutput.Key {
		t.Fatalf("Output.Module = %q, want %q", pipeline.Output.Module, jsonoutput.Key)
	}
	lane := pipeline.ArtifactLanes[0]
	if lane.Merge.Module != appendorder.Key {
		t.Fatalf("Merge.Module = %q, want %q", lane.Merge.Module, appendorder.Key)
	}
	if lane.Normalize.Module != noop.Key {
		t.Fatalf("Normalize.Module = %q, want %q", lane.Normalize.Module, noop.Key)
	}
}

func defaultModuleCatalog(t *testing.T) pipeline.ModuleCatalog {
	t.Helper()

	inputs := pipeline.NewInputAdapterRegistry()
	chunkers := pipeline.NewChunkerRegistry()
	extractors := pipeline.NewExtractorRegistry()
	mergers := pipeline.NewMergerRegistry()
	normalizers := pipeline.NewNormalizerRegistry()
	outputs := pipeline.NewOutputEncoderRegistry()

	if err := inputs.RegisterWithSpec(pipeline.ModuleSpec{
		Key:      "input",
		Stage:    pipeline.StageInput,
		Provides: []string{"source"},
	}, func() (contracts.InputAdapter, error) {
		return defaultInput{}, nil
	}); err != nil {
		t.Fatalf("register input: %v", err)
	}
	if err := units.Register(chunkers); err != nil {
		t.Fatalf("register generic chunker: %v", err)
	}
	if err := pipeline.RegisterExtractor[defaultArtifact](extractors, pipeline.ModuleSpec{
		Key:          "extract",
		Stage:        pipeline.StageExtract,
		ArtifactKind: defaultArtifactKind,
		Requires:     []string{"chunks"},
		Provides:     []string{"records"},
	}, func() (contracts.Extractor[defaultArtifact], error) {
		return defaultExtractor{}, nil
	}); err != nil {
		t.Fatalf("register extractor: %v", err)
	}
	if err := appendorder.RegisterTyped(mergers, defaultArtifactKind, func(values []defaultArtifact) (defaultArtifact, error) {
		if len(values) == 0 {
			return defaultArtifact{}, nil
		}
		return values[0], nil
	}); err != nil {
		t.Fatalf("register appendorder merger: %v", err)
	}
	if err := noop.RegisterTyped[defaultArtifact](normalizers, defaultArtifactKind); err != nil {
		t.Fatalf("register noop normalizer: %v", err)
	}
	if err := jsonoutput.Register(outputs); err != nil {
		t.Fatalf("register json output: %v", err)
	}

	codecs := pipeline.NewArtifactCodecRegistry()
	if err := pipeline.RegisterArtifactCodec(codecs, defaultArtifactCodec{}); err != nil {
		t.Fatalf("register artifact codec: %v", err)
	}
	return pipeline.ModuleCatalog{
		Inputs:          inputs,
		Chunkers:        chunkers,
		ArtifactCodecs:  codecs,
		Extractors:      extractors,
		Mergers:         mergers,
		Normalizers:     normalizers,
		ValidatorChains: pipeline.NewValidatorChainRegistry(),
		Outputs:         outputs,
	}
}

type defaultInput struct{}

func (defaultInput) Key() string { return "input" }

func (defaultInput) Parse(ctx context.Context, req contracts.ParseRequest) (*source.SourceDocument, error) {
	return nil, nil
}

type defaultExtractor struct{}

func (defaultExtractor) Key() string { return "extract" }

func (defaultExtractor) ReferenceSlots() []contracts.ReferenceSlot { return nil }

func (defaultExtractor) Extract(ctx context.Context, req contracts.TypedExtractionRequest) (contracts.TypedExtractionResult[defaultArtifact], error) {
	return contracts.TypedExtractionResult[defaultArtifact]{}, nil
}

const defaultArtifactKind contracts.ArtifactKind = "test/default"

type defaultArtifact struct {
	Value string `json:"value"`
}
type defaultArtifactCodec struct{}

func (defaultArtifactCodec) Kind() contracts.ArtifactKind { return defaultArtifactKind }
func (defaultArtifactCodec) Schema() contracts.ArtifactSchema {
	return contracts.ArtifactSchema{ID: "urn:notarius:test:default", Name: "default", Version: "1", JSONSchema: []byte(`{"type":"object"}`)}
}
func (defaultArtifactCodec) MediaType() string { return "application/json" }
func (defaultArtifactCodec) EncodeCandidate(value defaultArtifact) ([]byte, error) {
	return json.Marshal(value)
}
func (defaultArtifactCodec) Encode(value defaultArtifact) ([]byte, error) { return json.Marshal(value) }
func (defaultArtifactCodec) Decode(content []byte) (defaultArtifact, error) {
	var value defaultArtifact
	err := json.Unmarshal(content, &value)
	return value, err
}