package web

import (
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"strings"
	"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/engine"
	"github.com/local/glpi-neural-brain/internal/graph"
	"github.com/local/glpi-neural-brain/internal/model"
	"github.com/local/glpi-neural-brain/internal/research"
)

func TestRuntimeSettingsAndSourcesAPI(t *testing.T) {
	data := t.TempDir()
	g, err := graph.Open(data)
	if err != nil {
		t.Fatal(err)
	}
	g.UpsertNode(model.Node{ID: "n1", Kind: "knowledge", Label: "GLPI", Origin: "test", Categories: []string{"GLPI"}, Metadata: map[string]any{"source": "GLPI Knowledge Base"}})
	g.UpsertNode(model.Node{ID: "n2", Kind: "knowledge", Label: "Ollama", Origin: "test", Categories: []string{"Ollama"}, Metadata: map[string]any{"source": "internal-kb"}})
	g.UpsertNode(model.Node{ID: "n3", Kind: "knowledge", Label: "Ohne Kategorie", Origin: "test"})

	broker := activity.New(20)
	eng := engine.New(config.Config{
		DataDir:                   data,
		PersistInterval:           time.Minute,
		RuntimeDefaultsConfigured: true,
		LearningEnabled:           true,
		ThinkingEnabled:           true,
		DefaultView:               "neural",
		GLPIKBSource:              "Configured GLPI Source",
	}, g, broker)
	h := (&Server{Engine: eng, Graph: g, Broker: broker}).Handler()

	body := `{"learning_enabled":false,"thinking_enabled":false,"learning_sources":["GLPI Knowledge Base"],"display_sources":["internal-kb"],"thinking_sources":["GLPI Knowledge Base"],"view_mode":"constellation","max_display_nodes":1500,"low_power_mode":true}`
	req := httptest.NewRequest(http.MethodPut, "/api/runtime-settings", strings.NewReader(body))
	req.Header.Set("Content-Type", "application/json")
	res := httptest.NewRecorder()
	h.ServeHTTP(res, req)
	if res.Code != http.StatusOK {
		t.Fatalf("PUT runtime settings returned %d: %s", res.Code, res.Body.String())
	}
	var settings engine.RuntimeSettings
	if err := json.NewDecoder(res.Body).Decode(&settings); err != nil {
		t.Fatal(err)
	}
	if settings.LearningEnabled || settings.ThinkingEnabled || settings.ViewMode != "constellation" || settings.MaxDisplayNodes != 1500 || !settings.LowPowerMode {
		t.Fatalf("unexpected settings: %+v", settings)
	}

	res = httptest.NewRecorder()
	h.ServeHTTP(res, httptest.NewRequest(http.MethodGet, "/api/sources", nil))
	if res.Code != http.StatusOK {
		t.Fatalf("GET sources returned %d", res.Code)
	}
	var sources struct {
		Sources []engine.SourceInfo `json:"sources"`
	}
	if err := json.NewDecoder(res.Body).Decode(&sources); err != nil {
		t.Fatal(err)
	}
	foundConfiguredGLPI := false
	foundInternal := false
	for _, source := range sources.Sources {
		if source.Name == "Configured GLPI Source" && source.Count == 0 {
			foundConfiguredGLPI = true
		}
		if source.Name == "internal-kb" && source.Count == 1 {
			foundInternal = true
		}
	}
	if !foundConfiguredGLPI || !foundInternal {
		t.Fatalf("exact source options or configured GLPI source missing: %+v", sources.Sources)
	}

	res = httptest.NewRecorder()
	h.ServeHTTP(res, httptest.NewRequest(http.MethodPost, "/api/enrich?async=1", strings.NewReader(`{}`)))
	if res.Code != http.StatusConflict {
		t.Fatalf("disabled thinking should return 409, got %d: %s", res.Code, res.Body.String())
	}
}

func TestResearchDiagnosticAPI(t *testing.T) {
	searx := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write([]byte(`{"results":[{"title":"Btrfs documentation","url":"https://example.test/btrfs","content":"Snapshot evidence"}]}`))
	}))
	defer searx.Close()

	broker := activity.New(20)
	eng := &engine.Engine{
		Cfg:      config.Config{ResearchEnabled: true},
		Research: research.New(searx.URL),
		Broker:   broker,
	}
	h := (&Server{Engine: eng, Broker: broker}).Handler()

	res := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodPost, "/api/research/test", strings.NewReader(`{"query":"btrfs snapshots","limit":4}`))
	req.Header.Set("Content-Type", "application/json")
	h.ServeHTTP(res, req)
	if res.Code != http.StatusOK {
		t.Fatalf("research test returned %d: %s", res.Code, res.Body.String())
	}
	var result engine.ResearchTestResult
	if err := json.NewDecoder(res.Body).Decode(&result); err != nil {
		t.Fatal(err)
	}
	if !result.OK || !result.Diagnostic.OK || len(result.Results) != 1 {
		t.Fatalf("unexpected result: %+v", result)
	}

	res = httptest.NewRecorder()
	h.ServeHTTP(res, httptest.NewRequest(http.MethodGet, "/api/research/status", nil))
	if res.Code != http.StatusOK {
		t.Fatalf("research status returned %d: %s", res.Code, res.Body.String())
	}
	var status map[string]any
	if err := json.NewDecoder(res.Body).Decode(&status); err != nil {
		t.Fatal(err)
	}
	if status["ok"] != true {
		t.Fatalf("unexpected status: %#v", status)
	}
}

func TestSettingsPanelContentIsScrollable(t *testing.T) {
	broker := activity.New(4)
	h := (&Server{Broker: broker}).Handler()

	res := httptest.NewRecorder()
	h.ServeHTTP(res, httptest.NewRequest(http.MethodGet, "/", nil))
	if res.Code != http.StatusOK {
		t.Fatalf("GET / returned %d: %s", res.Code, res.Body.String())
	}
	body := res.Body.String()
	if !strings.Contains(body, `class="settings-scroll"`) {
		t.Fatal("settings panel is missing its scroll container")
	}
	if !strings.Contains(body, `class="settings-footer"`) {
		t.Fatal("settings footer is missing")
	}

	res = httptest.NewRecorder()
	h.ServeHTTP(res, httptest.NewRequest(http.MethodGet, "/app.css", nil))
	if res.Code != http.StatusOK {
		t.Fatalf("GET /app.css returned %d: %s", res.Code, res.Body.String())
	}
	css := res.Body.String()
	for _, expected := range []string{
		".settings-scroll{flex:1;min-height:0;overflow-y:auto",
		"overscroll-behavior:contain",
		".settings-footer{flex:0 0 auto",
	} {
		if !strings.Contains(css, expected) {
			t.Fatalf("scroll CSS is missing %q", expected)
		}
	}
}

func TestAnalysisDashboardPageAndAPI(t *testing.T) {
	data := t.TempDir()
	g, err := graph.Open(data)
	if err != nil {
		t.Fatal(err)
	}
	t.Cleanup(func() { _ = g.Close() })
	broker := activity.New(20)
	eng := engine.New(config.Config{DataDir: data, RuntimeDefaultsConfigured: true, LearningEnabled: true, ThinkingEnabled: true, PersistInterval: time.Minute}, g, broker)
	g.UpsertNode(model.Node{ID: "n1", Kind: "knowledge", Label: "Analyse", Origin: "test", Metadata: map[string]any{"source": "internal"}})
	broker.Publish(model.Activity{Type: "graph.updated", Source: "brain", Message: "Graph aktualisiert", Metadata: map[string]any{"nodes": 1, "edges": 0}})
	h := (&Server{Engine: eng, Graph: g, Broker: broker}).Handler()

	page := httptest.NewRecorder()
	h.ServeHTTP(page, httptest.NewRequest(http.MethodGet, "/analysis.html", nil))
	if page.Code != http.StatusOK || !strings.Contains(page.Body.String(), "BRAIN ANALYSIS CENTER") || !strings.Contains(page.Body.String(), "ÄNDERUNGSJOURNAL") {
		t.Fatalf("analysis page missing: %d %s", page.Code, page.Body.String())
	}

	deadline := time.Now().Add(3 * time.Second)
	for {
		res := httptest.NewRecorder()
		h.ServeHTTP(res, httptest.NewRequest(http.MethodGet, "/api/analysis/dashboard?hours=24&limit=50", nil))
		if res.Code != http.StatusOK {
			t.Fatalf("analysis API returned %d: %s", res.Code, res.Body.String())
		}
		var payload map[string]any
		if err := json.NewDecoder(res.Body).Decode(&payload); err != nil {
			t.Fatal(err)
		}
		history, _ := payload["history"].(map[string]any)
		if count, _ := history["raw_event_count"].(float64); count > 0 {
			break
		}
		if time.Now().After(deadline) {
			t.Fatal("analysis event was not visible through API")
		}
		time.Sleep(20 * time.Millisecond)
	}
}