package chat

import (
	"strings"
	"testing"
	"time"

	"github.com/rcourtman/pulse-go-rewrite/internal/ai/modelboundary"
	"github.com/rcourtman/pulse-go-rewrite/internal/ai/providers"
	"github.com/rcourtman/pulse-go-rewrite/internal/ai/tools"
	"github.com/rcourtman/pulse-go-rewrite/internal/models"
	"github.com/rcourtman/pulse-go-rewrite/internal/unifiedresources"
)

// governedHomeAssistantMention returns a sensitive system-container mention with
// the same governed policy a real guest receives (local-first routing with
// hostname/IP/alias/path redaction), plus the cloud-routed @mention reference.
func governedHomeAssistantMention() ResourceMention {
	return ResourceMention{
		Name:          "homeassistant",
		ResourceType:  "system-container",
		ResourceID:    "101",
		TargetID:      "node1",
		AISafeSummary: "system container resource; status online; redacted for cloud summary",
		Policy: &unifiedresources.ResourcePolicy{
			Sensitivity: unifiedresources.ResourceSensitivitySensitive,
			Routing: unifiedresources.ResourceRoutingPolicy{
				Scope: unifiedresources.ResourceRoutingScopeLocalFirst,
				Redact: []unifiedresources.ResourceRedactionHint{
					unifiedresources.ResourceRedactionHostname,
					unifiedresources.ResourceRedactionIPAddress,
					unifiedresources.ResourceRedactionAlias,
					unifiedresources.ResourceRedactionPath,
				},
			},
		},
	}
}

// homeAssistantDiscovery mirrors what Discovery captures for the HA LXC. The
// Hostname/IP-bearing fields are present on the DTO precisely so the test can
// prove the cloud-safe path never emits them.
func homeAssistantDiscovery() *tools.ResourceDiscoveryInfo {
	return &tools.ResourceDiscoveryInfo{
		ID:           "system-container:node1:101",
		ResourceType: "system-container",
		ResourceID:   "101",
		TargetID:     "node1",
		Hostname:     "delly-ha-host", // PII: must never reach the cloud-safe context
		ServiceType:  "home-assistant",
		ServiceName:  "Home Assistant",
		Category:     "home-automation",
		CLIAccess:    "pct exec 101 -- docker exec homeassistant",
		ConfigPaths:  []string{"/config/configuration.yaml", "/config/automations.yaml"},
		LogPaths:     []string{"/config/home-assistant.log"},
		Ports: []tools.DiscoveryPortInfo{
			{Port: 8123, Protocol: "tcp", Address: "192.168.0.101"}, // bind addr is PII
		},
	}
}

func TestPrefetcherCloudContext_CloudSharesAccessPathWithoutPII(t *testing.T) {
	prefetcher := NewContextPrefetcher(newTestReadState(models.StateSnapshot{}), nil)

	// On a cloud turn, governed resources surface the PII-free operational context:
	// useful commands/paths/ports reach the model, identifying hostnames/IPs do not.
	summary, spans := prefetcher.formatContextSummaryWithPolicy(
		[]ResourceMention{governedHomeAssistantMention()},
		[]*tools.ResourceDiscoveryInfo{homeAssistantDiscovery()},
		CloudContextPolicy{CloudRouting: true},
	)

	// The operational access path reaches the model.
	if !strings.Contains(summary, "pct exec 101 -- docker exec homeassistant") {
		t.Fatalf("opt-in cloud summary must include the access path, got:\n%s", summary)
	}
	if !strings.Contains(summary, "/config/automations.yaml") {
		t.Fatalf("opt-in cloud summary must include config paths, got:\n%s", summary)
	}
	if !strings.Contains(summary, "8123") {
		t.Fatalf("opt-in cloud summary must include the port number, got:\n%s", summary)
	}

	// PII never appears.
	if strings.Contains(summary, "delly-ha-host") {
		t.Fatalf("opt-in cloud summary leaked the hostname, got:\n%s", summary)
	}
	if strings.Contains(summary, "192.168.0.101") {
		t.Fatalf("opt-in cloud summary leaked the bind IP, got:\n%s", summary)
	}

	// The terse governed redaction is replaced, not appended.
	if strings.Contains(summary, unifiedresources.ResourcePolicyGovernedSummaryFooter()) {
		t.Fatalf("opt-in cloud summary must not fall back to the governed footer, got:\n%s", summary)
	}

	// The exact cloud-safe span is returned for allow-listing.
	if len(spans) != 1 {
		t.Fatalf("expected exactly one cloud-safe span, got %d: %#v", len(spans), spans)
	}
	if !strings.Contains(spans[0], "pct exec 101 -- docker exec homeassistant") {
		t.Fatalf("returned span must carry the access path, got %q", spans[0])
	}
	if strings.Contains(spans[0], "delly-ha-host") || strings.Contains(spans[0], "192.168.0.101") {
		t.Fatalf("returned span leaked PII, got %q", spans[0])
	}
}

func TestPrefetcherCloudContext_CloudWithoutDiscoveryKeepsGovernedSummary(t *testing.T) {
	prefetcher := NewContextPrefetcher(newTestReadState(models.StateSnapshot{}), nil)

	// A cloud turn with no discovery data falls back to the terse governed summary.
	summary, spans := prefetcher.formatContextSummaryWithPolicy(
		[]ResourceMention{governedHomeAssistantMention()},
		nil,
		CloudContextPolicy{CloudRouting: true},
	)

	if strings.Contains(summary, "pct exec") {
		t.Fatalf("cloud-without-discovery must withhold the access path, got:\n%s", summary)
	}
	if !strings.Contains(summary, unifiedresources.ResourcePolicyGovernedSummaryFooter()) {
		t.Fatalf("cloud-without-discovery must keep the governed redaction, got:\n%s", summary)
	}
	if len(spans) != 0 {
		t.Fatalf("cloud-without-discovery must not return cloud-safe spans, got %#v", spans)
	}
}

func TestPrefetcherCloudContext_LocalRoutingUnaffected(t *testing.T) {
	prefetcher := NewContextPrefetcher(newTestReadState(models.StateSnapshot{}), nil)

	// Local routing (Ollama): not a cloud turn, so no cloud-safe injection —
	// behavior matches the historical governed path.
	summary, spans := prefetcher.formatContextSummaryWithPolicy(
		[]ResourceMention{governedHomeAssistantMention()},
		[]*tools.ResourceDiscoveryInfo{homeAssistantDiscovery()},
		CloudContextPolicy{CloudRouting: false},
	)

	if !strings.Contains(summary, unifiedresources.ResourcePolicyGovernedSummaryFooter()) {
		t.Fatalf("local routing must keep the governed prefetch redaction, got:\n%s", summary)
	}
	if len(spans) != 0 {
		t.Fatalf("local routing must not return cloud-safe spans, got %#v", spans)
	}
}

func TestCloudSafeOperationalContext_CarriesDiscoveryFreshness(t *testing.T) {
	// The push-path conversion must carry UpdatedAt so the cloud-safe context
	// can tell the model how old the discovery is.
	d := homeAssistantDiscovery()
	d.UpdatedAt = time.Now().Add(-2 * 24 * time.Hour)

	out := cloudSafeOperationalContext(d)
	if !strings.Contains(out, "Last discovered: 2 days ago") {
		t.Fatalf("cloud-safe operational context must carry discovery freshness, got:\n%s", out)
	}
	// Freshness is non-identifying; PII still must not appear.
	if strings.Contains(out, "delly-ha-host") || strings.Contains(out, "192.168.0.101") {
		t.Fatalf("freshness must not bring PII into the cloud-safe context, got:\n%s", out)
	}
}

func TestCloudContextPolicy_SharesOnCloudRoutingOnly(t *testing.T) {
	if !(CloudContextPolicy{CloudRouting: true}).sharesCloudOperationalContext() {
		t.Fatal("cloud routing must share PII-free operational context")
	}
	if (CloudContextPolicy{CloudRouting: false}).sharesCloudOperationalContext() {
		t.Fatal("local routing must not trigger the cloud-safe path")
	}
}

// policiedResourceProvider is a minimal modelboundary.UnifiedResourceProvider
// returning one sensitive system container so the resource-policy sanitizer has
// real PII candidates to redact.
type policiedResourceProvider struct {
	resource unifiedresources.Resource
}

func (p *policiedResourceProvider) GetByType(t unifiedresources.ResourceType) []unifiedresources.Resource {
	if t == unifiedresources.ResourceTypeSystemContainer {
		return []unifiedresources.Resource{p.resource}
	}
	return nil
}

func TestCloudSafeContextSurvivesModelBoundarySanitizer(t *testing.T) {
	// A local-only (Restricted) guest whose hostname and IP the floor must redact
	// for cloud routing even though Pulse otherwise shares real identifiers.
	resource := unifiedresources.Resource{
		ID:   "system-container:node1:101",
		Type: unifiedresources.ResourceTypeSystemContainer,
		Name: "homeassistant",
		Tags: []string{"secret"},
		Identity: unifiedresources.ResourceIdentity{
			Hostnames:   []string{"delly-ha-host"},
			IPAddresses: []string{"192.168.0.101"},
		},
	}
	provider := &policiedResourceProvider{resource: resource}

	cloudSafe := cloudSafeOperationalContext(homeAssistantDiscovery())
	if cloudSafe == "" {
		t.Fatal("expected a non-empty cloud-safe context")
	}

	// The model request carries the cloud-safe span plus raw PII a model must not
	// see. "homeassistant" appears in the span (docker exec target) AND is an
	// alias the policy would redact, so the allow-list must protect it there.
	userContent := cloudSafe + "\n\nRaw host: delly-ha-host at 192.168.0.101 (homeassistant)"
	req := providers.ChatRequest{
		Messages: []providers.Message{{Role: "user", Content: userContent}},
	}

	sanitizer := modelboundary.RequestSanitizerForModel(
		"openai:gpt-4o",
		provider,
		modelboundary.AllowResourcePolicyText(cloudSafe),
	)
	if sanitizer == nil {
		t.Fatal("expected a sanitizer for a cloud-routed model")
	}
	out := sanitizer(req).Messages[0].Content

	// The access path survives intact.
	if !strings.Contains(out, "pct exec 101 -- docker exec homeassistant") {
		t.Fatalf("sanitizer stripped the allow-listed access path, got:\n%s", out)
	}
	// Raw PII outside the protected span is redacted.
	if strings.Contains(out, "delly-ha-host") {
		t.Fatalf("sanitizer must redact the raw hostname, got:\n%s", out)
	}
	if strings.Contains(out, "192.168.0.101") {
		t.Fatalf("sanitizer must redact the raw IP, got:\n%s", out)
	}
}