package pipeline

import (
	"strings"
	"testing"

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

func TestValidateModuleSpecAllowsReferenceSlotsForEligibleStages(t *testing.T) {
	tests := []struct {
		name  string
		kind  string
		stage ModuleStage
	}{
		{name: "chunker", kind: "chunker", stage: StageChunk},
		{name: "extractor", kind: "extractor", stage: StageExtract},
		{name: "normalizer", kind: "normalizer", stage: StageNormalize},
	}

	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			spec := normalizeModuleSpec(ModuleSpec{
				Key:   "module",
				Stage: test.stage,
				ReferenceSlots: []contracts.ReferenceSlot{
					{Name: "roster", Description: "Character roster", MaxBytes: 1024},
				},
			})
			err := validateModuleSpec(test.kind, test.stage, spec)
			if err != nil {
				t.Fatalf("validateModuleSpec() error = %v, want nil", err)
			}
		})
	}
}

func TestValidateModuleSpecRejectsReferenceSlotsForIneligibleStages(t *testing.T) {
	tests := []struct {
		name  string
		kind  string
		stage ModuleStage
	}{
		{name: "input", kind: "input adapter", stage: StageInput},
		{name: "merge", kind: "merger", stage: StageMerge},
		{name: "validate", kind: "validator", stage: StageValidate},
		{name: "output", kind: "output encoder", stage: StageOutput},
	}

	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			spec := normalizeModuleSpec(ModuleSpec{
				Key:   "module",
				Stage: test.stage,
				ReferenceSlots: []contracts.ReferenceSlot{
					{Name: "roster"},
				},
			})
			err := validateModuleSpec(test.kind, test.stage, spec)
			if err == nil {
				t.Fatal("validateModuleSpec() error = nil, want error")
			}
			if !strings.Contains(err.Error(), "reference slots") {
				t.Fatalf("validateModuleSpec() error = %q, want reference slots context", err.Error())
			}
		})
	}
}

func TestValidateModuleSpecRejectsInvalidReferenceSlotsForEligibleStages(t *testing.T) {
	invalidSlots := []struct {
		name  string
		slots []contracts.ReferenceSlot
		want  string
	}{
		{
			name:  "empty name",
			slots: []contracts.ReferenceSlot{{Name: " "}},
			want:  "name",
		},
		{
			name: "duplicate name after trim",
			slots: []contracts.ReferenceSlot{
				{Name: "roster"},
				{Name: " roster "},
			},
			want: "duplicated",
		},
		{
			name:  "negative max bytes",
			slots: []contracts.ReferenceSlot{{Name: "roster", MaxBytes: -1}},
			want:  "max_bytes",
		},
	}
	eligibleStages := []struct {
		name  string
		kind  string
		stage ModuleStage
	}{
		{name: "chunk", kind: "chunker", stage: StageChunk},
		{name: "extract", kind: "extractor", stage: StageExtract},
		{name: "normalize", kind: "normalizer", stage: StageNormalize},
	}

	for _, stage := range eligibleStages {
		for _, invalid := range invalidSlots {
			t.Run(stage.name+"/"+invalid.name, func(t *testing.T) {
				spec := normalizeModuleSpec(ModuleSpec{
					Key:            "module",
					Stage:          stage.stage,
					ReferenceSlots: invalid.slots,
				})
				err := validateModuleSpec(stage.kind, stage.stage, spec)
				if err == nil {
					t.Fatal("validateModuleSpec() error = nil, want error")
				}
				if !strings.Contains(err.Error(), invalid.want) {
					t.Fatalf("validateModuleSpec() error = %q, want %q", err.Error(), invalid.want)
				}
			})
		}
	}
}