package metriccatalog

import (
	"bytes"
	"context"
	"encoding/json"
	"errors"
	"strings"
	"testing"

	"github.com/itworx/pulse/internal/datasource"
)

func TestDefaultContainerMetricsUseUnraidCAdvisorNameLabel(t *testing.T) {
	catalog, err := DefaultRegistry()
	if err != nil {
		t.Fatal(err)
	}
	for _, semanticName := range []string{"container.cpu.utilization", "container.memory.used"} {
		metric, ok := catalog.Find(semanticName)
		if !ok {
			t.Fatalf("metric %q missing", semanticName)
		}
		if !strings.Contains(metric.QueryTemplate, `name={{container}}`) || strings.Contains(metric.QueryTemplate, `container={{container}}`) {
			t.Fatalf("metric %q does not target the Unraid cAdvisor name label: %s", semanticName, metric.QueryTemplate)
		}
	}
}

func TestDefaultCatalogValidatesAndHasDeterministicVersion(t *testing.T) {
	first, err := DefaultRegistry()
	if err != nil {
		t.Fatal(err)
	}
	second, err := DefaultRegistry()
	if err != nil {
		t.Fatal(err)
	}
	if first.Version() == "" || first.Version() != second.Version() {
		t.Fatalf("versions are not deterministic: %q/%q", first.Version(), second.Version())
	}
	if len(first.Metrics()) < 1 || len(first.Bindings()) != len(first.Metrics()) {
		t.Fatal("catalog metrics/bindings mismatch")
	}
	for _, binding := range first.Bindings() {
		if binding.State != BindingUnsupported || len(binding.MissingCapabilities) == 0 {
			t.Fatalf("unconfigured binding was not explicit: %+v", binding)
		}
	}
}

func TestCapabilityBindingDistinguishesSupportedAndUnavailable(t *testing.T) {
	catalog, err := DefaultRegistry()
	if err != nil {
		t.Fatal(err)
	}
	metric := catalog.Metrics()[0]
	capability := metric.RequiredCapabilities[0]
	supported, err := New(Catalog{SchemaVersion: SchemaVersion, Metrics: []Definition{metric}}, datasource.CapabilitySet{{ID: capability, Version: "v1", State: datasource.CapabilityEnabled}})
	if err != nil {
		t.Fatal(err)
	}
	if got := supported.Bindings()[0].State; got != BindingSupported {
		t.Fatalf("state=%q", got)
	}
	unavailable, err := New(Catalog{SchemaVersion: SchemaVersion, Metrics: []Definition{metric}}, datasource.CapabilitySet{{ID: capability, Version: "v1", State: datasource.CapabilityUnavailable}})
	if err != nil {
		t.Fatal(err)
	}
	if got := unavailable.Bindings()[0].State; got != BindingUnavailable {
		t.Fatalf("state=%q", got)
	}
}

func TestCatalogVersionChangesWhenDefinitionChanges(t *testing.T) {
	original, err := DefaultRegistry()
	if err != nil {
		t.Fatal(err)
	}
	metrics := original.Metrics()
	metrics[0].Description += " changed"
	changed, err := New(Catalog{SchemaVersion: SchemaVersion, Metrics: metrics}, nil)
	if err != nil {
		t.Fatal(err)
	}
	if original.Version() == changed.Version() {
		t.Fatal("catalog version did not change")
	}
}

func TestLoadRejectsUnknownFieldsAndHonorsCancellation(t *testing.T) {
	ctx, cancel := context.WithCancel(context.Background())
	cancel()
	if _, err := Load(ctx, bytes.NewBufferString(`{"schemaVersion":1,"metrics":[]}`), nil); !errors.Is(err, context.Canceled) {
		t.Fatalf("cancel error=%v", err)
	}
	// Plain encoding/json intentionally tolerates unknown fields; only Load is strict.
	var catalog Catalog
	if err := json.Unmarshal([]byte(`{"schemaVersion":1,"metrics":[],"unexpected":true}`), &catalog); err != nil {
		t.Fatalf("direct unmarshal rejected an unknown field: %v", err)
	}
	if _, err := Load(context.Background(), bytes.NewBufferString(`{"schemaVersion":1,"metrics":[],"unexpected":true}`), nil); err == nil {
		t.Fatal("unknown field accepted")
	}
}

func TestValidationRejectsUnknownPlaceholderDuplicateAndInvalidLimit(t *testing.T) {
	base := Definition{SemanticName: "host.cpu.utilization", Version: 1, Description: "cpu", Unit: "percent", ValueKind: "gauge", SourceKind: "prometheus", QueryTemplate: "up{host={{not_allowed}}}", AllowedLabels: []string{"instance"}, CardinalityBudget: 1, Limits: Limits{MaxRangeSeconds: 60, MaxSeries: 1, MaxPoints: 10, TimeoutSeconds: 1}, AllowedVisualizations: []string{"stat"}, FreshnessSeconds: 1}
	if _, err := New(Catalog{SchemaVersion: SchemaVersion, Metrics: []Definition{base}}, nil); err == nil {
		t.Fatal("unknown placeholder accepted")
	}
	base.QueryTemplate = "up"
	base.AllowedLabels = []string{"instance", "instance"}
	if _, err := New(Catalog{SchemaVersion: SchemaVersion, Metrics: []Definition{base}}, nil); err == nil {
		t.Fatal("duplicate label accepted")
	}
	base.AllowedLabels = []string{"instance"}
	base.Limits.MaxPoints = 9
	if _, err := New(Catalog{SchemaVersion: SchemaVersion, Metrics: []Definition{base}}, nil); err == nil {
		t.Fatal("invalid points accepted")
	}
}