<template>
  <v-banner
    v-if="showBanner"
    :color="isOverdue ? 'error' : 'warning'"
    :icon="isOverdue ? 'mdi-alert-octagon' : 'mdi-alert-circle'"
    :class="['dues-payment-banner', { 'overdue-banner': isOverdue }]"
  >
    <template #text>
      <div class="banner-content">
        <div class="text-h6 font-weight-bold mb-2">
          <v-icon left>{{ isOverdue ? 'mdi-alert-octagon' : 'mdi-credit-card-alert' }}</v-icon>
          {{ isOverdue ? '🚨 URGENT: Overdue Dues Payment' : 'Membership Dues Payment Required' }}
        </div>
        
        <div class="text-body-1 mb-3">
          {{ paymentMessage }}
        </div>
        
        <v-card 
          class="payment-details-card pa-3" 
          color="rgba(0,0,0,0.1)" 
          variant="outlined"
        >
          <div class="text-subtitle-1 font-weight-bold mb-2 text-white">
            <v-icon left size="small" class="text-white">mdi-bank</v-icon>
            Payment Details
          </div>
          
          <v-row dense>
            <v-col cols="12" sm="4" md="3">
              <div class="text-caption font-weight-bold text-white">Amount:</div>
              <div class="text-body-2 text-white">€{{ config.membershipFee }}/year</div>
            </v-col>
            
            <v-col cols="12" sm="8" md="5" v-if="config.iban">
              <div class="text-caption font-weight-bold text-white">IBAN:</div>
              <div class="text-body-2 font-family-monospace text-white">{{ config.iban }}</div>
            </v-col>
            
            <v-col cols="12" sm="12" md="4" v-if="config.accountHolder">
              <div class="text-caption font-weight-bold text-white">Account Holder:</div>
              <div class="text-body-2 text-white">{{ config.accountHolder }}</div>
            </v-col>
          </v-row>

          <v-divider class="my-2 border-opacity-50" />

          <v-row dense>
            <v-col cols="12">
              <div class="text-caption font-weight-bold text-white">Payment Reference:</div>
              <div class="text-body-2 font-family-monospace text-white" style="background-color: rgba(255, 255, 255, 0.2); padding: 8px; border-radius: 4px; border-left: 4px solid #ffffff;">
                {{ memberData?.member_id || 'Member ID pending' }}
              </div>
              <div class="text-caption text-white mt-1" style="opacity: 0.9;">
                <v-icon size="small" class="mr-1 text-white">mdi-information-outline</v-icon>
                Please include your member ID in the wire transfer reference for identification
              </div>
            </v-col>
          </v-row>

          <v-divider class="my-2 border-opacity-50" />
          
          <div class="text-caption d-flex align-center text-white" style="opacity: 0.9;">
            <v-icon size="small" class="mr-1 text-white">mdi-information-outline</v-icon>
            {{ daysRemaining > 0 ? `${daysRemaining} days remaining` : 'Payment overdue' }} 
            before account suspension
          </div>
        </v-card>
      </div>
    </template>
    
    <template #actions>
      <v-btn
        v-if="isAdmin"
        color="white"
        variant="outlined"
        size="small"
        @click="markAsPaidDialog = true"
        class="mr-2"
      >
        <v-icon left size="small">mdi-check-circle</v-icon>
        Mark as Paid
      </v-btn>
      
      <v-btn
        color="white"
        variant="text"
        size="small"
        @click="dismissBanner"
      >
        <v-icon left size="small">mdi-close</v-icon>
        Dismiss
      </v-btn>
    </template>
  </v-banner>

  <!-- Mark as Paid Dialog -->
  <v-dialog v-model="markAsPaidDialog" max-width="400">
    <v-card>
      <v-card-title class="text-h6 pa-4">
        <v-icon left color="success">mdi-calendar-check</v-icon>
        Mark Dues as Paid
      </v-card-title>
      
      <v-card-text class="pa-4">
        <div class="mb-4">
          <h4 class="text-subtitle-1 mb-2">
            {{ memberData?.FullName || `${memberData?.first_name || ''} ${memberData?.last_name || ''}`.trim() }}
          </h4>
          <p class="text-body-2 text-medium-emphasis">
            Select the date when the dues payment was received:
          </p>
        </div>
        
        <div class="date-picker-wrapper">
          <label class="date-picker-label">Payment Date</label>
          <VueDatePicker
            v-model="selectedPaymentModel"
            :timezone="{ 
              timezone: 'Europe/Monaco',
              emitTimezone: 'UTC'
            }"
            :format="'dd/MM/yyyy (Monaco)'"
            :max-date="new Date()"
            placeholder="Select payment date"
            :enable-time-picker="false"
            auto-apply
            :clearable="false"
            :required="true"
            @update:model-value="handleDateUpdate"
          />
          <div class="text-caption text-medium-emphasis mt-1">
            Select the date when the payment was received
          </div>
        </div>
        
        <v-alert 
          v-if="selectedPaymentDate && isDateInFuture" 
          type="warning" 
          variant="tonal" 
          class="mt-2"
          density="compact"
        >
          <v-icon start>mdi-information</v-icon>
          Future dates are not allowed. Please select today or an earlier date.
        </v-alert>
      </v-card-text>
      
      <v-card-actions class="pa-4 pt-0">
        <v-spacer />
        <v-btn 
          color="grey" 
          variant="text" 
          @click="cancelPaymentDialog"
        >
          Cancel
        </v-btn>
        <v-btn 
          color="success" 
          variant="elevated"
          :disabled="!selectedPaymentDate || isDateInFuture"
          :loading="updating"
          @click="markDuesAsPaid"
        >
          <v-icon start>mdi-check-circle</v-icon>
          Confirm Payment
        </v-btn>
      </v-card-actions>
    </v-card>
  </v-dialog>

  <!-- Snackbar for notifications -->
  <v-snackbar
    v-model="snackbar.show"
    :color="snackbar.color"
    :timeout="4000"
  >
    {{ snackbar.message }}
    <template #actions>
      <v-btn
        variant="text"
        @click="snackbar.show = false"
      >
        Close
      </v-btn>
    </template>
  </v-snackbar>
</template>

<script setup lang="ts">
import type { RegistrationConfig, Member } from '~/utils/types';
import { 
  isPaymentOverOneYear as checkPaymentOverOneYear, 
  isDuesActuallyCurrent as checkDuesActuallyCurrent, 
  calculateOverdueDays 
} from '~/utils/dues-calculations';

// Get auth state
const { user, isAdmin } = useAuth();

// Reactive state
const showBanner = ref(false);
const dismissed = ref(false);
const markAsPaidDialog = ref(false);
const updating = ref(false);
const memberData = ref<Member | null>(null);
const config = ref<RegistrationConfig>({
  membershipFee: 50,
  iban: '',
  accountHolder: ''
});

// Reactive state for payment date dialog
const selectedPaymentDate = ref('');
const selectedPaymentModel = ref<Date | null>(null);

const snackbar = ref({
  show: false,
  message: '',
  color: 'success'
});

/**
 * Check if a member is in their grace period
 * Uses the same logic as dues-status API
 */
const isInGracePeriod = computed(() => {
  if (!memberData.value?.payment_due_date) return false;
  
  try {
    const dueDate = new Date(memberData.value.payment_due_date);
    const today = new Date();
    return dueDate > today;
  } catch {
    return false;
  }
});

/**
 * Check if a member's last payment is over 1 year old
 * Uses standardized dues calculation function
 */
const isPaymentOverOneYear = computed(() => {
  if (!memberData.value) return false;
  return checkPaymentOverOneYear(memberData.value);
});

/**
 * Calculate next dues date (1 year from when they last paid or joined)
 */
const nextDuesDate = computed(() => {
  if (!memberData.value) return null;
  
  // If dues are paid, calculate 1 year from payment date
  if (memberData.value.current_year_dues_paid === 'true' && memberData.value.membership_date_paid) {
    const lastPaidDate = new Date(memberData.value.membership_date_paid);
    const nextDue = new Date(lastPaidDate);
    nextDue.setFullYear(nextDue.getFullYear() + 1);
    return nextDue;
  }
  
  // If not paid but has a due date, use that
  if (memberData.value.payment_due_date) {
    return new Date(memberData.value.payment_due_date);
  }
  
  // Fallback: 1 year from member since date
  if (memberData.value.member_since) {
    const memberSince = new Date(memberData.value.member_since);
    const nextDue = new Date(memberSince);
    nextDue.setFullYear(nextDue.getFullYear() + 1);
    return nextDue;
  }
  
  return null;
});

/**
 * Check if dues are coming due within 30 days (for paid members)
 */
const isDueSoon = computed(() => {
  if (!memberData.value || !nextDuesDate.value) return false;
  
  // Only show warning if dues are currently paid
  if (memberData.value.current_year_dues_paid !== 'true') return false;
  
  const today = new Date();
  const thirtyDaysFromNow = new Date();
  thirtyDaysFromNow.setDate(thirtyDaysFromNow.getDate() + 30);
  
  // Show banner if due date is within the next 30 days
  return nextDuesDate.value <= thirtyDaysFromNow && nextDuesDate.value > today;
});

/**
 * Check if dues are overdue
 * Uses standardized dues calculation function
 */
const isDuesOverdue = computed(() => {
  if (!memberData.value) return false;
  
  // Use the standardized function - if not current, then overdue
  return !checkDuesActuallyCurrent(memberData.value);
});

/**
 * Check if dues need to be paid (either coming due soon or overdue)
 */
const needsPayment = computed(() => {
  if (!memberData.value) return false;
  
  // Show banner if dues are coming due soon OR overdue
  return isDueSoon.value || isDuesOverdue.value;
});

// Computed properties
const shouldShowBanner = computed(() => {
  if (!user.value || !memberData.value) return false;
  if (dismissed.value) return false;
  
  // Show banner when payment is needed
  return needsPayment.value;
});

const daysRemaining = computed(() => {
  if (!nextDuesDate.value) return 0;
  
  const dueDate = nextDuesDate.value;
  const today = new Date();
  const diffTime = dueDate.getTime() - today.getTime();
  const diffDays = Math.ceil(diffTime / (1000 * 60 * 60 * 24));
  
  return diffDays; // Allow negative values for overdue
});

const isOverdue = computed(() => {
  return isDuesOverdue.value;
});

const paymentMessage = computed(() => {
  if (isDuesOverdue.value) {
    const overdueDays = Math.abs(daysRemaining.value);
    return `Your annual membership dues of €${config.value.membershipFee} are ${overdueDays > 0 ? overdueDays + ' day' + (overdueDays !== 1 ? 's' : '') + ' ' : ''}overdue. Immediate payment is required to avoid account suspension.`;
  } else if (isDueSoon.value) {
    const dueDays = daysRemaining.value;
    if (dueDays <= 7) {
      return `Your annual membership dues of €${config.value.membershipFee} are due in ${dueDays} day${dueDays !== 1 ? 's' : ''}. Please pay immediately to avoid late fees.`;
    } else {
      return `Your annual membership dues of €${config.value.membershipFee} are due in ${dueDays} day${dueDays !== 1 ? 's' : ''}. Please pay soon to avoid account suspension.`;
    }
  } else {
    return `Your annual membership dues of €${config.value.membershipFee} require attention.`;
  }
});

const todayDate = computed(() => {
  return new Date().toISOString().split('T')[0]; // YYYY-MM-DD format
});

const isDateInFuture = computed(() => {
  if (!selectedPaymentDate.value) return false;
  
  const selectedDate = new Date(selectedPaymentDate.value);
  const today = new Date();
  today.setHours(0, 0, 0, 0); // Reset time to start of day
  selectedDate.setHours(0, 0, 0, 0); // Reset time to start of day
  
  return selectedDate > today;
});

// Methods
function dismissBanner() {
  dismissed.value = true;
  showBanner.value = false;
  
  // Store dismissal in localStorage (expires after 24 hours)
  const dismissalData = {
    timestamp: Date.now(),
    userId: user.value?.id
  };
  localStorage.setItem('dues-banner-dismissed', JSON.stringify(dismissalData));
}

async function markDuesAsPaid() {
  if (!memberData.value?.Id || !selectedPaymentDate.value || isDateInFuture.value) return;
  
  updating.value = true;
  
  try {
    // Update member's dues status with the selected payment date
    await $fetch(`/api/members/${memberData.value.Id}`, {
      method: 'PUT',
      body: {
        current_year_dues_paid: 'true',
        membership_date_paid: selectedPaymentDate.value,
        payment_due_date: new Date(new Date(selectedPaymentDate.value).getTime() + 365 * 24 * 60 * 60 * 1000).toISOString() // Next year from payment date
      }
    });
    
    // Update local member state
    if (memberData.value) {
      memberData.value.current_year_dues_paid = 'true';
      memberData.value.membership_date_paid = selectedPaymentDate.value;
    }
    
    // Hide banner and reset
    showBanner.value = false;
    markAsPaidDialog.value = false;
    selectedPaymentDate.value = '';
    
    // Show success message
    snackbar.value = {
      show: true,
      message: 'Dues marked as paid successfully!',
      color: 'success'
    };
    
  } catch (error: any) {
    console.error('Failed to mark dues as paid:', error);
    snackbar.value = {
      show: true,
      message: 'Failed to update payment status. Please try again.',
      color: 'error'
    };
  } finally {
    updating.value = false;
  }
}

// Date picker handler
const handleDateUpdate = (date: Date | null) => {
  if (date) {
    selectedPaymentDate.value = date.toISOString().split('T')[0];
  }
};

const cancelPaymentDialog = () => {
  markAsPaidDialog.value = false;
  selectedPaymentDate.value = '';
  selectedPaymentModel.value = null;
};

// Load member data for the current user from session
async function loadMemberData() {
  if (!user.value) return;
  
  try {
    const response = await $fetch('/api/auth/session') as any;
    if (response?.success && response?.member) {
      memberData.value = response.member;
    }
  } catch (error) {
    console.warn('Failed to load member data:', error);
  }
}

// Load configuration and check banner visibility
async function loadConfig() {
  try {
    const response = await $fetch('/api/registration-config') as any;
    if (response?.success) {
      config.value = response.data;
    }
  } catch (error) {
    console.warn('Failed to load registration config:', error);
  }
}

// Check if banner was recently dismissed
function checkDismissalStatus() {
  try {
    const stored = localStorage.getItem('dues-banner-dismissed');
    if (stored) {
      const dismissalData = JSON.parse(stored);
      const hoursSinceDismissal = (Date.now() - dismissalData.timestamp) / (1000 * 60 * 60);
      
      // Reset dismissal after 24 hours or if different user
      if (hoursSinceDismissal > 24 || dismissalData.userId !== user.value?.id) {
        localStorage.removeItem('dues-banner-dismissed');
        dismissed.value = false;
      } else {
        dismissed.value = true;
      }
    }
  } catch (error) {
    console.warn('Failed to check dismissal status:', error);
    dismissed.value = false;
  }
}

// Watchers
watch(shouldShowBanner, (newVal) => {
  showBanner.value = newVal;
}, { immediate: true });

watch(user, () => {
  checkDismissalStatus();
  loadMemberData();
}, { immediate: true });

// Initialize
onMounted(() => {
  loadConfig();
  checkDismissalStatus();
  loadMemberData();
});
</script>

<style scoped>
.dues-payment-banner {
  border-left: 4px solid #ff9800;
}

.dues-payment-banner.overdue-banner {
  border-left: 4px solid #f44336;
  animation: pulse-border 2s infinite;
}

@keyframes pulse-border {
  0% { border-left-color: #f44336; }
  50% { border-left-color: #ff5252; }
  100% { border-left-color: #f44336; }
}

.banner-content {
  width: 100%;
}

.payment-details-card {
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2) !important;
}

/* Date picker styling to match Vuetify */
.date-picker-wrapper {
  width: 100%;
}

.date-picker-label {
  font-size: 16px;
  color: rgba(var(--v-theme-on-surface), var(--v-medium-emphasis-opacity));
  font-weight: 400;
  line-height: 1.5;
  letter-spacing: 0.009375em;
  margin-bottom: 8px;
  display: block;
}

/* Style the Vue DatePicker to match Vuetify inputs */
:deep(.dp__input) {
  border: 1px solid rgba(var(--v-border-color), var(--v-border-opacity));
  border-radius: 4px;
  padding: 16px 12px;
  padding-right: 48px; /* Make room for calendar icon */
  font-size: 16px;
  line-height: 1.5;
  background: rgb(var(--v-theme-surface));
  color: rgba(var(--v-theme-on-surface), var(--v-high-emphasis-opacity));
  transition: border-color 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  width: 100%;
  min-height: 56px;
}

:deep(.dp__input:hover) {
  border-color: rgba(var(--v-theme-on-surface), var(--v-high-emphasis-opacity));
}

:deep(.dp__input:focus) {
  border-color: rgb(var(--v-theme-primary));
  border-width: 2px;
  outline: none;
}

:deep(.dp__input_readonly) {
  cursor: pointer;
}

/* Style the date picker dropdown */
:deep(.dp__menu) {
  border: 1px solid rgba(var(--v-border-color), var(--v-border-opacity));
  border-radius: 4px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  background: rgb(var(--v-theme-surface));
}

/* Primary color theming for the date picker */
:deep(.dp__primary_color) {
  background-color: rgb(var(--v-theme-primary));
}

:deep(.dp__primary_text) {
  color: rgb(var(--v-theme-primary));
}

:deep(.dp__active_date) {
  background-color: rgb(var(--v-theme-primary));
  color: rgb(var(--v-theme-on-primary));
}

:deep(.dp__today) {
  border: 1px solid rgb(var(--v-theme-primary));
}

/* Mobile responsiveness */
@media (max-width: 600px) {
  .banner-content .text-h6 {
    font-size: 1.1rem !important;
  }
  
  .payment-details-card {
    margin-top: 8px;
  }
}
</style>
