import { AuthCard } from '@/components/auth/AuthCard';
import { AuthFooterLinks } from '@/components/auth/AuthFooterLinks';
import { AuthForm } from '@/components/auth/AuthForm';
import { checkPasswordStrength } from '@/lib/utils/validation';
import { SignupViewData } from '@/lib/view-data/SignupViewData';
import { Button } from '@/ui/Button';
import { Grid } from '@/ui/Grid';
import { Group } from '@/ui/Group';
import { Icon } from '@/ui/Icon';
import { Input } from '@/ui/Input';
import { Link } from '@/ui/Link';
import { LoadingSpinner } from '@/ui/LoadingSpinner';
import { PasswordField } from '@/ui/PasswordField';
import { ProgressBar } from '@/ui/ProgressBar';
import { Text } from '@/ui/Text';
import { AlertCircle, Check, Mail, User, UserPlus, X } from 'lucide-react';
import React from 'react';

interface SignupTemplateProps {
  viewData: SignupViewData;
  formActions: {
    handleChange: (e: React.ChangeEvent<HTMLInputElement>) => void;
    handleSubmit: (e: React.FormEvent<HTMLFormElement>) => Promise<void>;
    setShowPassword: (show: boolean) => void;
    setShowConfirmPassword: (show: boolean) => void;
  };
  uiState: {
    showPassword: boolean;
    showConfirmPassword: boolean;
  };
  mutationState: {
    isPending: boolean;
    error: string | null;
  };
}

export function SignupTemplate({ viewData, formActions, uiState, mutationState }: SignupTemplateProps) {
  const isSubmitting = mutationState.isPending;
  const passwordValue = viewData.formState.fields.password.value || '';
  const passwordStrength = checkPasswordStrength(passwordValue);

  const passwordRequirements = [
    { met: passwordValue.length >= 8, label: '8+ characters' },
    { met: /[a-z]/.test(passwordValue) && /[A-Z]/.test(passwordValue), label: 'Case mix' },
    { met: /\d/.test(passwordValue), label: 'Number' },
    { met: /[^a-zA-Z\d]/.test(passwordValue), label: 'Special' },
  ];

  const getStrengthIntent = () => {
    if (passwordStrength.score <= 2) return 'critical';
    if (passwordStrength.score <= 4) return 'warning';
    return 'success';
  };

  return (
    <AuthCard 
      title="Create Account" 
      description="Join the GridPilot racing community"
    >
      <AuthForm onSubmit={formActions.handleSubmit}>
        <Group direction="column" gap={6} fullWidth>
          <Group direction="column" gap={4} fullWidth>
            <Text size="xs" weight="bold" variant="low" uppercase letterSpacing="wide" block>Personal Information</Text>
            <Grid cols={{ base: 1, md: 2 }} gap={4}>
              <Input
                label="First Name"
                id="firstName"
                name="firstName"
                value={viewData.formState.fields.firstName.value}
                onChange={formActions.handleChange}
                errorMessage={viewData.formState.fields.firstName.error}
                placeholder="John"
                disabled={isSubmitting}
                autoComplete="given-name"
                icon={<User size={16} />}
              />
              <Input
                label="Last Name"
                id="lastName"
                name="lastName"
                value={viewData.formState.fields.lastName.value}
                onChange={formActions.handleChange}
                errorMessage={viewData.formState.fields.lastName.error}
                placeholder="Smith"
                disabled={isSubmitting}
                autoComplete="family-name"
                icon={<User size={16} />}
              />
            </Grid>
            
            <Group direction="row" align="start" gap={2} fullWidth>
              <Icon icon={AlertCircle} size={3.5} color="var(--ui-color-intent-warning)" />
              <Text size="xs" variant="low">
                <Text weight="bold" variant="warning">Note:</Text> Your name cannot be changed after signup.
              </Text>
            </Group>

            <Input
              label="Email Address"
              id="email"
              name="email"
              type="email"
              value={viewData.formState.fields.email.value}
              onChange={formActions.handleChange}
              errorMessage={viewData.formState.fields.email.error}
              placeholder="you@example.com"
              disabled={isSubmitting}
              autoComplete="email"
              icon={<Mail size={16} />}
            />
          </Group>

          <Group direction="column" gap={4} fullWidth>
            <Text size="xs" weight="bold" variant="low" uppercase letterSpacing="wide" block>Security</Text>
            <PasswordField
              label="Password"
              id="password"
              name="password"
              value={viewData.formState.fields.password.value}
              onChange={formActions.handleChange}
              errorMessage={viewData.formState.fields.password.error}
              placeholder="••••••••"
              disabled={isSubmitting}
              autoComplete="new-password"
              showPassword={uiState.showPassword}
              onTogglePassword={() => formActions.setShowPassword(!uiState.showPassword)}
            />

            {passwordValue && (
              <Group direction="column" gap={3} fullWidth>
                <Group direction="row" align="center" gap={2} fullWidth>
                  <Group fullWidth>
                    <ProgressBar 
                      value={(passwordStrength.score / 5) * 100} 
                      intent={getStrengthIntent()} 
                      size="sm"
                    />
                  </Group>
                  <Text size="xs" weight="bold" variant="low" uppercase>
                    {passwordStrength.label}
                  </Text>
                </Group>
                <Grid cols={2} gap={2}>
                  {passwordRequirements.map((req, index) => (
                    <Group key={index} direction="row" align="center" gap={1.5}>
                      <Icon icon={req.met ? Check : X} size={3} color={req.met ? 'var(--ui-color-intent-success)' : 'var(--ui-color-text-low)'} />
                      <Text size="xs" variant={req.met ? 'med' : 'low'}>
                        {req.label}
                      </Text>
                    </Group>
                  ))}
                </Grid>
              </Group>
            )}

            <PasswordField
              label="Confirm Password"
              id="confirmPassword"
              name="confirmPassword"
              value={viewData.formState.fields.confirmPassword.value}
              onChange={formActions.handleChange}
              errorMessage={viewData.formState.fields.confirmPassword.error}
              placeholder="••••••••"
              disabled={isSubmitting}
              autoComplete="new-password"
              showPassword={uiState.showConfirmPassword}
              onTogglePassword={() => formActions.setShowConfirmPassword(!uiState.showConfirmPassword)}
            />
          </Group>
        </Group>

        {mutationState.error && (
          <Group direction="row" align="start" gap={3} fullWidth>
            <Icon icon={AlertCircle} size={4.5} color="var(--ui-color-intent-critical)" />
            <Text size="sm" variant="critical">{mutationState.error}</Text>
          </Group>
        )}

        <Button
          type="submit"
          variant="primary"
          disabled={isSubmitting}
          fullWidth
          icon={isSubmitting ? <LoadingSpinner size={4} /> : <UserPlus size={16} />}
        >
          {isSubmitting ? 'Creating account...' : 'Create Account'}
        </Button>
      </AuthForm>

      <AuthFooterLinks>
        <Text size="sm" variant="low">
          Already have an account?{' '}
          <Link
            href={viewData.returnTo && viewData.returnTo !== '/onboarding' ? `/auth/login?returnTo=${encodeURIComponent(viewData.returnTo)}` : '/auth/login'}
          >
            <Text variant="primary" weight="bold">Sign in</Text>
          </Link>
        </Text>
        
        <Group direction="column" gap={1} align="center" fullWidth>
          <Text size="xs" variant="low">
            By creating an account, you agree to our{' '}
            <Link href="/terms">Terms</Link>
            {' '}and{' '}
            <Link href="/privacy">Privacy</Link>
          </Text>
        </Group>
      </AuthFooterLinks>
    </AuthCard>
  );
}