<template>
  <div :class="containerClasses">
    <v-container class="fill-height" fluid>
      <v-row align="center" justify="center">
        <v-col cols="12" sm="8" md="6" lg="4">
          <v-card class="elevation-12 rounded-lg">
            <v-card-text class="text-center pa-8">
              <div class="mb-6">
                <v-icon 
                  color="primary" 
                  size="80"
                  class="mb-4"
                >
                  mdi-lock-plus
                </v-icon>
                
                <h1 class="text-h4 font-weight-bold text-primary mb-3">
                  Set Your Password
                </h1>
                
                <p class="text-body-1 text-medium-emphasis mb-2" v-if="email">
                  Complete your registration by setting a secure password for <strong>{{ email }}</strong>
                </p>
                
                <p class="text-body-1 text-medium-emphasis">
                  Choose a strong password to secure your MonacoUSA Portal account.
                </p>
              </div>

              <!-- Password Setup Form -->
              <v-form ref="formRef" v-model="formValid" @submit.prevent="setupPassword">
                <!-- Email Input (shown when email is not provided in URL) -->
                <v-text-field
                  v-if="showEmailInput"
                  v-model="email"
                  label="Email Address"
                  variant="outlined"
                  density="comfortable"
                  :rules="emailRules"
                  :error="!!errorMessage"
                  prepend-inner-icon="mdi-email"
                  class="mb-3"
                  autocomplete="email"
                  type="email"
                  placeholder="Enter your email address"
                />

                <v-text-field
                  v-model="password"
                  :type="showPassword ? 'text' : 'password'"
                  label="New Password"
                  variant="outlined"
                  density="comfortable"
                  :rules="passwordRules"
                  :error="!!errorMessage"
                  :append-inner-icon="showPassword ? 'mdi-eye' : 'mdi-eye-off'"
                  @click:append-inner="togglePasswordVisibility('password')"
                  class="mb-3 password-field"
                  autocomplete="new-password"
                  :autofocus="false"
                />

                <v-text-field
                  v-model="confirmPassword"
                  :type="showConfirmPassword ? 'text' : 'password'"
                  label="Confirm Password"
                  variant="outlined"
                  density="comfortable"
                  :rules="confirmPasswordRules"
                  :error="!!errorMessage"
                  :append-inner-icon="showConfirmPassword ? 'mdi-eye' : 'mdi-eye-off'"
                  @click:append-inner="togglePasswordVisibility('confirm')"
                  class="mb-4 password-field"
                  autocomplete="new-password"
                  :autofocus="false"
                />

                <!-- Password Strength Indicator -->
                <v-progress-linear
                  :model-value="passwordStrength"
                  :color="passwordStrengthColor"
                  height="6"
                  class="mb-2"
                />
                <p class="text-caption text-medium-emphasis mb-4">
                  Password strength: {{ passwordStrengthLabel }}
                </p>

                <!-- Error Alert -->
                <v-alert
                  v-if="errorMessage"
                  type="error"
                  variant="tonal"
                  class="mb-4 text-start"
                  icon="mdi-alert"
                >
                  {{ errorMessage }}
                </v-alert>

                <!-- Success Alert -->
                <v-alert
                  v-if="successMessage"
                  type="success"
                  variant="tonal"
                  class="mb-4 text-start"
                  icon="mdi-check-circle"
                >
                  {{ successMessage }}
                </v-alert>

                <div class="d-flex flex-column gap-3">
                  <v-btn
                    type="submit"
                    color="primary"
                    size="large"
                    variant="elevated"
                    block
                    :loading="loading"
                    :disabled="!formValid || loading"
                    class="text-none"
                  >
                    <v-icon start>mdi-check</v-icon>
                    Set Password & Continue
                  </v-btn>

                  <v-btn
                    color="secondary"
                    size="large"
                    variant="outlined"
                    block
                    :to="{ path: '/login' }"
                    :disabled="loading"
                    class="text-none"
                  >
                    <v-icon start>mdi-login</v-icon>
                    I Already Have a Password
                  </v-btn>

                  <v-btn
                    color="outline"
                    size="small"
                    variant="text"
                    block
                    to="/"
                    :disabled="loading"
                    class="text-none"
                  >
                    <v-icon start>mdi-home</v-icon>
                    Return to Home
                  </v-btn>
                </div>
              </v-form>

              <!-- Additional help -->
              <div class="mt-6 pt-4 border-t">
                <p class="text-caption text-medium-emphasis mb-2">
                  Need help? Contact support at:
                </p>
                <v-chip
                  size="small"
                  variant="outlined"
                  prepend-icon="mdi-email"
                >
                  support@monacousa.org
                </v-chip>
              </div>
            </v-card-text>
          </v-card>
        </v-col>
      </v-row>
    </v-container>
  </div>
</template>

<script setup lang="ts">

definePageMeta({
  layout: false,
  middleware: 'guest'
});

// Device detection
const isMobile = ref(false);
const isMobileSafari = ref(false);

// Initialize device detection on mount
onMounted(() => {
  if (process.client) {
    const userAgent = navigator.userAgent;
    isMobile.value = /Android|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(userAgent) || window.innerWidth <= 768;
    isMobileSafari.value = /iPhone|iPad|iPod/i.test(userAgent) && /Safari/i.test(userAgent);
  }
});

// CSS classes based on device detection
const containerClasses = computed(() => {
  const classes = ['password-setup-page'];
  if (isMobile.value) classes.push('is-mobile');
  if (isMobileSafari.value) classes.push('is-mobile-safari', 'performance-mode');
  return classes.join(' ');
});

// Reactive state
const loading = ref(false);
const errorMessage = ref('');
const successMessage = ref('');
const formValid = ref(false);
const showPassword = ref(false);
const showConfirmPassword = ref(false);

// Form data
const password = ref('');
const confirmPassword = ref('');

// Get query parameters - static to prevent reload loops
const route = useRoute();
const email = ref((route.query.email as string) || '');
const token = ref((route.query.token as string) || '');
const showEmailInput = ref(!email.value); // Show email input if email is not provided

// Form ref
const formRef = ref();

// Password strength calculation
const passwordStrength = computed(() => {
  if (!password.value) return 0;
  
  let score = 0;
  // Length
  if (password.value.length >= 8) score += 20;
  if (password.value.length >= 12) score += 10;
  
  // Character types
  if (/[a-z]/.test(password.value)) score += 15;
  if (/[A-Z]/.test(password.value)) score += 15;
  if (/[0-9]/.test(password.value)) score += 15;
  if (/[^A-Za-z0-9]/.test(password.value)) score += 25;
  
  return Math.min(score, 100);
});

const passwordStrengthColor = computed(() => {
  if (passwordStrength.value < 40) return 'error';
  if (passwordStrength.value < 70) return 'warning';
  return 'success';
});

const passwordStrengthLabel = computed(() => {
  if (passwordStrength.value < 40) return 'Weak';
  if (passwordStrength.value < 70) return 'Good';
  return 'Strong';
});

// Validation rules
const passwordRules = [
  (v: string) => !!v || 'Password is required',
  (v: string) => v.length >= 8 || 'Password must be at least 8 characters',
  (v: string) => /[A-Z]/.test(v) || 'Password must contain at least one uppercase letter',
  (v: string) => /[a-z]/.test(v) || 'Password must contain at least one lowercase letter',
  (v: string) => /[0-9]/.test(v) || 'Password must contain at least one number',
];

const confirmPasswordRules = [
  (v: string) => !!v || 'Please confirm your password',
  (v: string) => v === password.value || 'Passwords do not match',
];

const emailRules = [
  (v: string) => !!v || 'Email address is required',
  (v: string) => /.+@.+\..+/.test(v) || 'Please enter a valid email address',
];

// Set page title with mobile viewport optimization
useHead({
  title: 'Set Your Password - MonacoUSA Portal',
  meta: [
    {
      name: 'description',
      content: 'Set your password to complete your MonacoUSA Portal registration.'
    },
    { name: 'viewport', content: 'width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no, viewport-fit=cover' }
  ]
});

// Toggle password visibility - simplified for static detection
const togglePasswordVisibility = (field: 'password' | 'confirm') => {
  if (field === 'password') {
    showPassword.value = !showPassword.value;
  } else {
    showConfirmPassword.value = !showConfirmPassword.value;
  }
};

// Setup password function
const setupPassword = async () => {
  if (!formValid.value) return;
  
  if (!email.value) {
    errorMessage.value = 'No email address provided. Please check the link from your email.';
    return;
  }

  try {
    loading.value = true;
    errorMessage.value = '';
    successMessage.value = '';

    // Call our password setup API
    const response = await $fetch('/api/auth/setup-password', {
      method: 'POST',
      body: {
        email: email.value,
        password: password.value,
        token: token.value
      }
    });

    console.log('[setup-password] Password setup successful:', response);

    successMessage.value = 'Password set successfully! Redirecting to login...';

    // Wait a moment to show success message, then redirect
    setTimeout(() => {
      navigateTo({
        path: '/login',
        query: { email: email.value, passwordSet: 'true' }
      });
    }, 2000);

  } catch (err: any) {
    console.error('[setup-password] Password setup failed:', err);
    
    if (err.statusCode === 400) {
      errorMessage.value = 'Invalid request. Please check your information and try again.';
    } else if (err.statusCode === 404) {
      errorMessage.value = 'User not found. The link may be invalid or expired.';
    } else if (err.statusCode === 409) {
      errorMessage.value = 'Password has already been set. You can log in with your existing password.';
    } else if (err.statusCode === 422) {
      errorMessage.value = 'Password does not meet security requirements. Please choose a stronger password.';
    } else {
      errorMessage.value = err.message || 'Failed to set password. Please try again or contact support.';
    }
    
    loading.value = false;
  }
};

// Component initialization
onMounted(async () => {
  console.log('[setup-password] Password setup page loaded for:', email.value);
  
  // Check if we have required parameters
  if (!email.value) {
    errorMessage.value = 'No email address provided. Please use the link from your verification email.';
  }
});
</script>

<style scoped>
.password-setup-page {
  min-height: 100vh;
  min-height: calc(var(--vh, 1vh) * 100); /* Mobile Safari fallback */
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  overflow-x: hidden; /* Prevent horizontal scroll on mobile */
}

/* Mobile Safari optimizations */
.password-setup-page.is-mobile-safari {
  min-height: 100vh;
  min-height: -webkit-fill-available;
}

.password-setup-page.performance-mode {
  will-change: auto;
  transform: translateZ(0); /* Lighter hardware acceleration */
}

.fill-height {
  min-height: 100vh;
  min-height: calc(var(--vh, 1vh) * 100); /* Mobile Safari fallback */
}

/* Mobile Safari fill-height optimization */
.is-mobile-safari .fill-height {
  min-height: -webkit-fill-available;
}

.border-t {
  border-top: 1px solid rgba(var(--v-border-color), var(--v-border-opacity));
}

.gap-3 {
  gap: 12px;
}

/* Custom scrollbar for mobile */
::-webkit-scrollbar {
  width: 4px;
}

::-webkit-scrollbar-track {
  background: rgba(255, 255, 255, 0.1);
}

::-webkit-scrollbar-thumb {
  background: rgba(163, 21, 21, 0.5);
  border-radius: 2px;
}

/* Responsive adjustments */
@media (max-width: 600px) {
  .password-setup-page {
    padding: 16px;
  }
  
  .v-card {
    margin: 0;
  }
  
  /* Optimize button spacing on mobile */
  .gap-3 {
    gap: 8px;
  }
}

/* Improve touch targets on mobile */
@media (hover: none) and (pointer: coarse) {
  .v-btn {
    min-height: 48px; /* Ensure touch-friendly button size */
  }
}

/* Performance mode optimizations */
.performance-mode .v-card {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1) !important; /* Lighter shadow */
}

.performance-mode .v-btn {
  transition: none; /* Remove button transitions for better performance */
}

/* Form styling improvements */
.v-text-field {
  margin-bottom: 8px;
}

.v-progress-linear {
  border-radius: 3px;
}

/* Password field specific optimizations for mobile */
.password-field :deep(.v-field__input) {
  font-size: 16px !important; /* Prevent zoom on iOS */
  -webkit-text-fill-color: currentColor !important;
}

/* Prevent auto-zoom on focus for mobile Safari */
@media screen and (max-width: 768px) {
  .password-field :deep(input) {
    font-size: 16px !important;
  }
  
  .password-field :deep(.v-field__append-inner) {
    /* Make eye icon easier to tap on mobile */
    min-width: 44px;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
  }
}

/* iOS specific fixes to prevent zoom */
@supports (-webkit-touch-callout: none) {
  .password-field :deep(input) {
    font-size: 16px !important;
  }
}

/* Disable transitions on mobile for better performance */
.is-mobile .password-field :deep(.v-field__append-inner) {
  transition: none !important;
}

.is-mobile .password-field :deep(.v-icon) {
  transition: none !important;
}
</style>
