package main

import (
	"bytes"
	"encoding/json"
	"io/fs"
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"testing"
	"time"

	"kb-editor/internal/aifallback"
	"kb-editor/internal/staging"
	"kb-editor/internal/store"
)

func TestBulkAllMatchingUsesJSONFilterNames(t *testing.T) {
	dir := t.TempDir()
	backup := filepath.Join(t.TempDir(), "backups")
	t.Setenv("BACKUP_DIR", backup)
	write := func(name string, auto bool) {
		t.Helper()
		b, _ := json.Marshal(map[string]any{"id": name, "title": name, "auto_reply": auto, "language": "de-DE"})
		if err := os.WriteFile(filepath.Join(dir, name+".json"), b, 0o644); err != nil {
			t.Fatal(err)
		}
	}
	write("true-one", true)
	write("false-one", false)

	s, err := store.New(dir)
	if err != nil {
		t.Fatal(err)
	}
	web, err := fs.Sub(webFS, "web")
	if err != nil {
		t.Fatal(err)
	}
	h := newApp(s, web).routes()

	body := []byte(`{"keys":[],"all_matching":true,"query":{"auto_reply":"false"},"patch":{"set_language":"en-US"},"dry_run":true}`)
	req := httptest.NewRequest(http.MethodPost, "/api/bulk", bytes.NewReader(body))
	req.Header.Set("Content-Type", "application/json")
	rr := httptest.NewRecorder()
	h.ServeHTTP(rr, req)
	if rr.Code != http.StatusOK {
		t.Fatalf("status=%d body=%s", rr.Code, rr.Body.String())
	}
	var result store.BulkResult
	if err := json.Unmarshal(rr.Body.Bytes(), &result); err != nil {
		t.Fatal(err)
	}
	if result.Targeted != 1 || result.Changed != 1 {
		t.Fatalf("unexpected result: %+v", result)
	}
}

func TestGoogleModeBlocksWrites(t *testing.T) {
	dir := t.TempDir()
	b, _ := json.Marshal(map[string]any{"id": "KB-1", "title": "Test", "answer": "Lösung"})
	if err := os.WriteFile(filepath.Join(dir, "one.json"), b, 0o644); err != nil {
		t.Fatal(err)
	}
	s, err := store.New(dir)
	if err != nil {
		t.Fatal(err)
	}
	web, err := fs.Sub(webFS, "viewer")
	if err != nil {
		t.Fatal(err)
	}
	h := newApp(s, web, appConfig{Mode: "google", Title: "Helpdesk", Writable: false}).routes()

	item := s.List(store.Query{Page: 1, PageSize: 10}).Items[0]
	req := httptest.NewRequest(http.MethodPut, "/api/items/"+item.Key, bytes.NewBufferString(`{"title":"changed"}`))
	req.Header.Set("Content-Type", "application/json")
	rr := httptest.NewRecorder()
	h.ServeHTTP(rr, req)
	if rr.Code != http.StatusForbidden {
		t.Fatalf("status=%d body=%s", rr.Code, rr.Body.String())
	}

	doc, _, err := s.Get(item.Key)
	if err != nil {
		t.Fatal(err)
	}
	if doc["title"] != "Test" {
		t.Fatalf("document changed in google mode: %+v", doc)
	}
}

func TestSearchEndpointReturnsRankedHits(t *testing.T) {
	dir := t.TempDir()
	write := func(name string, doc map[string]any) {
		t.Helper()
		b, _ := json.Marshal(doc)
		if err := os.WriteFile(filepath.Join(dir, name+".json"), b, 0o644); err != nil {
			t.Fatal(err)
		}
	}
	write("exact", map[string]any{"id": "0x80070005", "title": "Zugriff verweigert", "text": "Berechtigungen prüfen"})
	write("mention", map[string]any{"id": "KB-2", "title": "Allgemeiner Windows-Fehler", "answer": "Kann 0x80070005 enthalten"})

	s, err := store.New(dir)
	if err != nil {
		t.Fatal(err)
	}
	web, err := fs.Sub(webFS, "viewer")
	if err != nil {
		t.Fatal(err)
	}
	h := newApp(s, web, appConfig{Mode: "google", Title: "Helpdesk", Writable: false}).routes()

	req := httptest.NewRequest(http.MethodGet, "/api/search?q=0x80070005&page=1&page_size=20", nil)
	rr := httptest.NewRecorder()
	h.ServeHTTP(rr, req)
	if rr.Code != http.StatusOK {
		t.Fatalf("status=%d body=%s", rr.Code, rr.Body.String())
	}
	var result store.SearchResult
	if err := json.Unmarshal(rr.Body.Bytes(), &result); err != nil {
		t.Fatal(err)
	}
	if result.Total != 2 || len(result.Items) != 2 {
		t.Fatalf("unexpected result: %+v", result)
	}
	if result.Items[0].ID != "0x80070005" {
		t.Fatalf("exact ID should rank first: %+v", result.Items)
	}
}

func TestAIFallbackOnlyRunsForZeroResultsAndReturnsStagingArticle(t *testing.T) {
	knowledge := t.TempDir()
	b, _ := json.Marshal(map[string]any{"id": "KB-KNOWN", "title": "Bekannter Fehler", "answer": "Bekannte Lösung"})
	if err := os.WriteFile(filepath.Join(knowledge, "known.json"), b, 0o644); err != nil {
		t.Fatal(err)
	}
	s, err := store.New(knowledge)
	if err != nil {
		t.Fatal(err)
	}

	calls := 0
	ollama := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		calls++
		w.Header().Set("Content-Type", "application/json")
		_ = json.NewEncoder(w).Encode(map[string]any{
			"message": map[string]any{"content": `{"title":"KI-Entwurf","text":"Symptom","answer":"1. Diagnose","categories":["Windows"],"keywords":["unbekannt"]}`},
			"done":    true,
		})
	}))
	defer ollama.Close()

	st, err := staging.New(t.TempDir())
	if err != nil {
		t.Fatal(err)
	}
	ai, err := aifallback.New(aifallback.Config{BaseURL: ollama.URL, Model: "test-model", Timeout: time.Second, MaxConcurrent: 1, MinScore: 0.78}, st)
	if err != nil {
		t.Fatal(err)
	}
	web, err := fs.Sub(webFS, "viewer")
	if err != nil {
		t.Fatal(err)
	}
	h := newApp(s, web, appConfig{Mode: "google", Title: "Helpdesk", Writable: false, AIFallbackEnabled: true}).withAI(ai).routes()

	// Existing results must block the AI path before Ollama is called.
	req := httptest.NewRequest(http.MethodPost, "/api/ai/fallback", bytes.NewBufferString(`{"query":"Bekannter Fehler"}`))
	req.Header.Set("Content-Type", "application/json")
	rr := httptest.NewRecorder()
	h.ServeHTTP(rr, req)
	if rr.Code != http.StatusConflict {
		t.Fatalf("known query status=%d body=%s", rr.Code, rr.Body.String())
	}
	if calls != 0 {
		t.Fatalf("Ollama should not be called when KB has hits, calls=%d", calls)
	}

	// Unknown query is generated and stored in staging.
	req = httptest.NewRequest(http.MethodPost, "/api/ai/fallback", bytes.NewBufferString(`{"query":"0xDEADBEEF völlig unbekannt"}`))
	req.Header.Set("Content-Type", "application/json")
	rr = httptest.NewRecorder()
	h.ServeHTTP(rr, req)
	if rr.Code != http.StatusCreated {
		t.Fatalf("unknown query status=%d body=%s", rr.Code, rr.Body.String())
	}
	var generated aifallback.Result
	if err := json.Unmarshal(rr.Body.Bytes(), &generated); err != nil {
		t.Fatal(err)
	}
	if calls != 1 || generated.Key == "" {
		t.Fatalf("calls=%d result=%+v", calls, generated)
	}

	get := httptest.NewRequest(http.MethodGet, "/api/staging/"+generated.Key, nil)
	getRR := httptest.NewRecorder()
	h.ServeHTTP(getRR, get)
	if getRR.Code != http.StatusOK {
		t.Fatalf("staging get status=%d body=%s", getRR.Code, getRR.Body.String())
	}
}