"use client";

// ============================================================================
// Onboarding Page - First Workspace Creation
// ============================================================================

import { useState, useRef } from "react";
import { useRouter } from "next/navigation";
import { Building2, Loader2, Megaphone, Upload, Trash2, X } from "lucide-react";
import { workspacesApi } from "@/lib/api";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import { Avatar, AvatarFallback, AvatarImage } from "@/components/ui/avatar";
import {
  Card,
  CardContent,
  CardDescription,
  CardFooter,
  CardHeader,
  CardTitle,
} from "@/components/ui/card";
import { STORAGE_KEYS } from "@/lib/utils/constants";

export default function OnboardingPage() {
  const router = useRouter();
  const [name, setName] = useState("");
  const [avatarFile, setAvatarFile] = useState<File | null>(null);
  const [avatarPreview, setAvatarPreview] = useState<string | null>(null);
  const [isCreating, setIsCreating] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const fileInputRef = useRef<HTMLInputElement>(null);

  const handleAvatarChange = (e: React.ChangeEvent<HTMLInputElement>) => {
    const file = e.target.files?.[0];
    if (!file) return;

    if (file.size > 2 * 1024 * 1024) {
      setError("Размер файла не должен превышать 2 МБ");
      return;
    }

    setAvatarFile(file);
    const reader = new FileReader();
    reader.onload = () => {
      setAvatarPreview(reader.result as string);
    };
    reader.readAsDataURL(file);
    setError(null);
  };

  const handleAvatarRemove = () => {
    setAvatarFile(null);
    setAvatarPreview(null);
    if (fileInputRef.current) {
      fileInputRef.current.value = "";
    }
  };

  const handleCreate = async () => {
    if (!name.trim()) return;

    try {
      setIsCreating(true);
      setError(null);

      const workspace = await workspacesApi.create({ name: name.trim(), avatar_file: avatarFile });

      // Save as selected workspace
      localStorage.setItem(STORAGE_KEYS.SELECTED_WORKSPACE, workspace.id);

      // Redirect to dashboard
      router.replace(`/dashboard/${workspace.id}`);
    } catch (err: any) {
      setError(err?.error?.message || "Не удалось создать воркспейс");
    } finally {
      setIsCreating(false);
    }
  };

  return (
    <div className="flex min-h-screen items-center justify-center bg-gradient-to-br from-background to-muted p-4">
      <Card className="w-full max-w-md">
        <CardHeader className="text-center">
          <div className="mx-auto mb-4 flex h-16 w-16 items-center justify-center rounded-full bg-primary/10">
            <Megaphone className="h-8 w-8 text-primary" />
          </div>
          <CardTitle className="text-2xl">Добро пожаловать в Smartpost!</CardTitle>
          <CardDescription>
            Создайте свой первый воркспейс для начала работы
          </CardDescription>
        </CardHeader>

        <CardContent className="space-y-4">
          {/* Avatar */}
          <div className="flex items-center gap-4">
            <Avatar className="h-16 w-16">
              <AvatarImage src={avatarPreview || undefined} alt="Avatar preview" />
              <AvatarFallback className="text-xl">
                {name.charAt(0).toUpperCase() || "W"}
              </AvatarFallback>
            </Avatar>
            <div className="flex flex-col gap-2">
              <div className="flex items-center gap-2">
                <Button
                  variant="outline"
                  size="sm"
                  onClick={() => fileInputRef.current?.click()}
                  disabled={isCreating}
                >
                  <Upload className="h-4 w-4 mr-2" />
                  Загрузить
                </Button>
                {avatarPreview && (
                  <Button
                    variant="outline"
                    size="sm"
                    onClick={handleAvatarRemove}
                    disabled={isCreating}
                  >
                    <Trash2 className="h-4 w-4" />
                  </Button>
                )}
              </div>
              <p className="text-xs text-muted-foreground">
                PNG, JPG или GIF. Максимум 2 МБ.
              </p>
              <input
                ref={fileInputRef}
                type="file"
                accept="image/*"
                className="hidden"
                onChange={handleAvatarChange}
              />
            </div>
          </div>

          <div className="space-y-2">
            <Label htmlFor="workspace-name">Название воркспейса</Label>
            <Input
              id="workspace-name"
              placeholder="Например: Моя команда"
              value={name}
              onChange={(e) => setName(e.target.value)}
              onKeyDown={(e) => {
                if (e.key === "Enter") {
                  handleCreate();
                }
              }}
              disabled={isCreating}
            />
            <p className="text-xs text-muted-foreground">
              Воркспейс — это изолированное пространство для вашей команды. Вы
              сможете пригласить участников и настроить права доступа.
            </p>
          </div>

          {error && (
            <div className="rounded-md bg-destructive/10 p-3 text-sm text-destructive">
              {error}
            </div>
          )}
        </CardContent>

        <CardFooter>
          <Button
            className="w-full"
            onClick={handleCreate}
            disabled={!name.trim() || isCreating}
          >
            {isCreating ? (
              <>
                <Loader2 className="mr-2 h-4 w-4 animate-spin" />
                Создание...
              </>
            ) : (
              <>
                <Building2 className="mr-2 h-4 w-4" />
                Создать воркспейс
              </>
            )}
          </Button>
        </CardFooter>
      </Card>
    </div>
  );
}