package engine

import (
	"context"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"testing"
	"time"

	"github.com/local/glpi-neural-brain/internal/activity"
	"github.com/local/glpi-neural-brain/internal/config"
	"github.com/local/glpi-neural-brain/internal/graph"
)

func TestEnrichWritesAIThinkOnlyAfterStructuredQwenDecision(t *testing.T) {
	mock := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		switch r.URL.Path {
		case "/api/tags":
			_, _ = w.Write([]byte(`{"models":[{"name":"qwen3:8b","digest":"chat-digest"},{"name":"embeddinggemma:latest","digest":"embed-digest"}]}`))
		case "/api/embed":
			var req struct {
				Input []string `json:"input"`
			}
			_ = json.NewDecoder(r.Body).Decode(&req)
			vectors := make([][]float64, len(req.Input))
			for i := range vectors {
				vectors[i] = []float64{1, float64(i) * .05, 0}
			}
			_ = json.NewEncoder(w).Encode(map[string]any{"embeddings": vectors})
		case "/api/chat":
			content := `{"related":true,"relation_type":"supports","confidence":0.91,"explanation":"Beide Einträge behandeln denselben VPN-Störungsablauf.","needs_research":false,"research_query":"","title":"VPN-Gateway und Remotezugriff","synthesis":"Der Gateway-Fehler ist ein konkreter Teilbereich des Remotezugriffs.","keywords":["VPN","Gateway"]}`
			_ = json.NewEncoder(w).Encode(map[string]any{"message": map[string]any{"content": content}})
		default:
			http.NotFound(w, r)
		}
	}))
	defer mock.Close()

	root := t.TempDir()
	knowledge := filepath.Join(root, "knowledge")
	staging := filepath.Join(root, "staging")
	data := filepath.Join(root, "data")
	for _, d := range []string{knowledge, staging, data} {
		if err := os.MkdirAll(d, 0o755); err != nil {
			t.Fatal(err)
		}
	}
	write := func(name, body string) {
		if err := os.WriteFile(filepath.Join(knowledge, name), []byte(body), 0o644); err != nil {
			t.Fatal(err)
		}
	}
	write("vpn.json", `{"id":"KB-VPN","title":"VPN Gateway","text":"Gateway nicht erreichbar","categories":["Netzwerk"],"keywords":["VPN","Gateway"],"source":"internal-kb"}`)
	write("remote.json", `{"id":"KB-REMOTE","title":"Remotezugriff und VPN","text":"Remotezugriff über VPN und Gateway","categories":["Netzwerk"],"keywords":["VPN","Remotezugriff"],"source":"internal-kb"}`)

	g, err := graph.Open(data)
	if err != nil {
		t.Fatal(err)
	}
	cfg := config.Config{DataDir: data, KnowledgeDirs: []string{knowledge}, StagingDirs: []string{staging}, OllamaURL: mock.URL, ChatModel: "qwen3:8b", EmbeddingModel: "embeddinggemma", ScanInterval: time.Minute, EnrichInterval: time.Minute, SimilarityThreshold: .5, RelationThreshold: .7, TopK: 5, MaxContextChars: 8000}
	e := New(cfg, g, activity.New(20))
	if err := e.Scan(context.Background()); err != nil {
		t.Fatal(err)
	}
	if !e.ollamaOK {
		t.Fatal("mock Ollama should be healthy")
	}
	if err := e.EnrichOne(context.Background()); err != nil {
		t.Fatal(err)
	}
	if err := e.Flush(context.Background()); err != nil {
		t.Fatal(err)
	}
	files, err := filepath.Glob(filepath.Join(staging, "*.json"))
	if err != nil || len(files) != 1 {
		t.Fatalf("expected one AI-THINK file, files=%v err=%v", files, err)
	}
	var doc map[string]any
	b, _ := os.ReadFile(files[0])
	if err := json.Unmarshal(b, &doc); err != nil {
		t.Fatal(err)
	}
	if doc["auto_reply"] != false {
		t.Fatalf("AI-THINK must be auto_reply=false: %#v", doc["auto_reply"])
	}
	cats, _ := doc["categories"].([]any)
	found := false
	for _, c := range cats {
		if c == "AI-THINK" {
			found = true
		}
	}
	if !found {
		t.Fatalf("AI-THINK category missing: %#v", cats)
	}
}

func TestRequestEnrichDoesNotQueueDuplicateCycle(t *testing.T) {
	g, err := graph.Open(t.TempDir())
	if err != nil {
		t.Fatal(err)
	}
	e := New(config.Config{EnrichBatchSize: 3, EnrichAnchors: 12}, g, activity.New(20))
	if !e.RequestEnrich("manual") {
		t.Fatal("first AI-THINK request should be queued")
	}
	if e.RequestEnrich("automatic") {
		t.Fatal("duplicate AI-THINK cycle should not be queued")
	}
	status := e.Status()
	if status["enrich_result"] != "queued" {
		t.Fatalf("unexpected enrich status: %#v", status["enrich_result"])
	}
}

func TestRuntimeSettingsDisableThinkingAndPersist(t *testing.T) {
	data := t.TempDir()
	g, err := graph.Open(data)
	if err != nil {
		t.Fatal(err)
	}
	cfg := config.Config{DataDir: data, RuntimeDefaultsConfigured: true, LearningEnabled: true, ThinkingEnabled: true, DefaultView: "neural", PersistInterval: time.Minute}
	e := New(cfg, g, activity.New(20))
	updated, err := e.SetRuntimeSettings(RuntimeSettings{
		LearningEnabled:    false,
		ThinkingEnabled:    false,
		LearningCategories: []string{"Netzwerk"},
		DisplayCategories:  []string{"GLPI KB"},
		ThinkingCategories: []string{"Netzwerk"},
		ViewMode:           "honeycomb",
	})
	if err != nil {
		t.Fatal(err)
	}
	if updated.LearningEnabled || updated.ThinkingEnabled || updated.ViewMode != "honeycomb" {
		t.Fatalf("unexpected runtime settings: %+v", updated)
	}
	if e.RequestEnrich("manual") {
		t.Fatal("disabled thinking must not queue AI-THINK")
	}
	if err := e.Scan(context.Background()); err != ErrLearningDisabled {
		t.Fatalf("expected ErrLearningDisabled, got %v", err)
	}
	if err := e.Flush(context.Background()); err != nil {
		t.Fatal(err)
	}

	g2, err := graph.Open(data)
	if err != nil {
		t.Fatal(err)
	}
	e2 := New(cfg, g2, activity.New(20))
	loaded := e2.RuntimeSettings()
	if loaded.LearningEnabled || loaded.ThinkingEnabled || loaded.ViewMode != "honeycomb" || len(loaded.DisplayCategories) != 1 {
		t.Fatalf("runtime settings were not restored: %+v", loaded)
	}
}