package web_test

import (
	"bytes"
	"encoding/json"
	"io"
	"log/slog"
	"net/http"
	"net/http/httptest"
	"path/filepath"
	"strings"
	"testing"

	"vibetree/internal/database"
	"vibetree/internal/models"
	"vibetree/internal/web"
)

func testApp(t *testing.T) *web.App {
	t.Helper()
	dir := t.TempDir()
	db, err := database.Open(filepath.Join(dir, "test.db"))
	if err != nil {
		t.Fatalf("open db: %v", err)
	}
	t.Cleanup(func() { db.Close() })

	log := slog.New(slog.NewTextHandler(io.Discard, nil))
	app, err := web.NewApp(db, log, false)
	if err != nil {
		t.Fatalf("new app: %v", err)
	}
	return app
}

// loginAs signs in and returns the session cookie for subsequent requests.
func loginAs(t *testing.T, srv *httptest.Server, username, password string) *http.Cookie {
	t.Helper()
	form := "username=" + username + "&password=" + password
	req, _ := http.NewRequest(http.MethodPost, srv.URL+"/login", strings.NewReader(form))
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
	client := &http.Client{CheckRedirect: func(req *http.Request, via []*http.Request) error { return http.ErrUseLastResponse }}
	res, err := client.Do(req)
	if err != nil {
		t.Fatalf("login request: %v", err)
	}
	defer res.Body.Close()
	if res.StatusCode != http.StatusSeeOther {
		t.Fatalf("expected redirect on login, got %d", res.StatusCode)
	}
	for _, c := range res.Cookies() {
		if c.Name == "vibetree_session" {
			return c
		}
	}
	t.Fatal("no session cookie set")
	return nil
}

func TestHealthz(t *testing.T) {
	app := testApp(t)
	srv := httptest.NewServer(app.Router())
	defer srv.Close()

	res, err := http.Get(srv.URL + "/healthz")
	if err != nil {
		t.Fatalf("get: %v", err)
	}
	defer res.Body.Close()
	if res.StatusCode != http.StatusOK {
		t.Fatalf("expected 200, got %d", res.StatusCode)
	}
}

func TestLoginAndInventoryPage(t *testing.T) {
	app := testApp(t)
	srv := httptest.NewServer(app.Router())
	defer srv.Close()

	cookie := loginAs(t, srv, "admin", "admin")

	req, _ := http.NewRequest(http.MethodGet, srv.URL+"/inventory", nil)
	req.AddCookie(cookie)
	res, err := http.DefaultClient.Do(req)
	if err != nil {
		t.Fatalf("get inventory: %v", err)
	}
	defer res.Body.Close()
	if res.StatusCode != http.StatusOK {
		t.Fatalf("expected 200, got %d", res.StatusCode)
	}
	body, _ := io.ReadAll(res.Body)
	if !bytes.Contains(body, []byte("Inventory")) {
		t.Fatalf("expected inventory page content")
	}
}

func TestUnauthenticatedRedirectsToLogin(t *testing.T) {
	app := testApp(t)
	srv := httptest.NewServer(app.Router())
	defer srv.Close()

	client := &http.Client{CheckRedirect: func(req *http.Request, via []*http.Request) error { return http.ErrUseLastResponse }}
	res, err := client.Get(srv.URL + "/inventory")
	if err != nil {
		t.Fatalf("get: %v", err)
	}
	defer res.Body.Close()
	if res.StatusCode != http.StatusSeeOther {
		t.Fatalf("expected redirect to login, got %d", res.StatusCode)
	}
}

func TestFolderCreateRequiresAdmin(t *testing.T) {
	app := testApp(t)
	srv := httptest.NewServer(app.Router())
	defer srv.Close()

	// Create a normal (non-admin) user directly via the store.
	normalUser := &models.User{Username: "normie", Role: models.RoleUser, Enabled: true}
	if err := app.Users.Create(t.Context(), normalUser, "normiepass"); err != nil {
		t.Fatalf("create user: %v", err)
	}

	cookie := loginAs(t, srv, "normie", "normiepass")

	payload := `{"name":"Should Fail"}`
	req, _ := http.NewRequest(http.MethodPost, srv.URL+"/app/folders", strings.NewReader(payload))
	req.Header.Set("Content-Type", "application/json")
	req.AddCookie(cookie)
	res, err := http.DefaultClient.Do(req)
	if err != nil {
		t.Fatalf("post folder: %v", err)
	}
	defer res.Body.Close()
	if res.StatusCode != http.StatusForbidden {
		t.Fatalf("expected 403 for non-admin folder create, got %d", res.StatusCode)
	}
}

func TestFolderAndAssetLifecycleAsAdmin(t *testing.T) {
	app := testApp(t)
	srv := httptest.NewServer(app.Router())
	defer srv.Close()

	cookie := loginAs(t, srv, "admin", "admin")

	folderID := postJSON(t, srv, cookie, "/app/folders", `{"name":"Main Office"}`)["ID"].(float64)

	assetPayload := `{"name":"Core Switch","item_type_id":4,"folder_id":` + itoa(int64(folderID)) + `,"status_id":1,"fields":{}}`
	req, _ := http.NewRequest(http.MethodPost, srv.URL+"/app/assets", strings.NewReader(assetPayload))
	req.Header.Set("Content-Type", "application/json")
	req.AddCookie(cookie)
	res, err := http.DefaultClient.Do(req)
	if err != nil {
		t.Fatalf("post asset: %v", err)
	}
	defer res.Body.Close()
	if res.StatusCode != http.StatusOK {
		body, _ := io.ReadAll(res.Body)
		t.Fatalf("expected 200 creating asset, got %d: %s", res.StatusCode, body)
	}
	var envelope struct {
		Data struct {
			AssetID string `json:"asset_id"`
		} `json:"data"`
	}
	if err := json.NewDecoder(res.Body).Decode(&envelope); err != nil {
		t.Fatalf("decode: %v", err)
	}
	if envelope.Data.AssetID != "IT-000001" {
		t.Fatalf("expected auto-generated IT-000001, got %s", envelope.Data.AssetID)
	}
}

func postJSON(t *testing.T, srv *httptest.Server, cookie *http.Cookie, path, payload string) map[string]any {
	t.Helper()
	req, _ := http.NewRequest(http.MethodPost, srv.URL+path, strings.NewReader(payload))
	req.Header.Set("Content-Type", "application/json")
	req.AddCookie(cookie)
	res, err := http.DefaultClient.Do(req)
	if err != nil {
		t.Fatalf("post %s: %v", path, err)
	}
	defer res.Body.Close()
	if res.StatusCode != http.StatusOK {
		body, _ := io.ReadAll(res.Body)
		t.Fatalf("expected 200 for %s, got %d: %s", path, res.StatusCode, body)
	}
	var envelope struct {
		Data map[string]any `json:"data"`
	}
	if err := json.NewDecoder(res.Body).Decode(&envelope); err != nil {
		t.Fatalf("decode: %v", err)
	}
	return envelope.Data
}

func itoa(n int64) string {
	if n == 0 {
		return "0"
	}
	neg := n < 0
	if neg {
		n = -n
	}
	var b []byte
	for n > 0 {
		b = append([]byte{byte('0' + n%10)}, b...)
		n /= 10
	}
	if neg {
		b = append([]byte{'-'}, b...)
	}
	return string(b)
}