'use client';

import { useState, useEffect } from 'react';
import { listPlans, deletePlan, getEntitlements } from '@/src/lib/api/facility-admin';
import type { MembershipPlan, PlanTemplate, PlanEntitlements } from '@/src/types/facility-admin';
import PlanCard from '@/src/components/plans/PlanCard';
import PlanFormModal from '@/src/components/plans/PlanFormModal';
import PlanListSkeleton from '@/src/components/plans/PlanListSkeleton';
import TemplatePicker from '@/src/components/plans/TemplatePicker';
import EntitlementsConfigModal from '@/src/components/plans/EntitlementsConfigModal';

interface MembershipPlansComponentProps {
  facilityId: number;
}

export default function MembershipPlansComponent({ facilityId }: MembershipPlansComponentProps) {
  const [plans, setPlans] = useState<MembershipPlan[]>([]);
  const [entitlementsMap, setEntitlementsMap] = useState<Record<number, PlanEntitlements>>({});
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);
  const [templatePickerOpen, setTemplatePickerOpen] = useState(false);
  const [createModalOpen, setCreateModalOpen] = useState(false);
  const [selectedTemplate, setSelectedTemplate] = useState<PlanTemplate | null>(null);
  const [editingPlan, setEditingPlan] = useState<MembershipPlan | null>(null);
  const [configuringPlan, setConfiguringPlan] = useState<MembershipPlan | null>(null);

  useEffect(() => {
    fetchPlans();
  }, [facilityId]);

  async function fetchPlans() {
    setLoading(true);
    setError(null);

    const result = await listPlans(facilityId, { include_inactive: false });

    if (result.success) {
      setPlans(result.data);
      // Fetch entitlements for all plans in parallel
      await fetchAllEntitlements(result.data);
    } else {
      setError(result.error.detail || 'Failed to load plans');
    }

    setLoading(false);
  }

  async function fetchAllEntitlements(plansList: MembershipPlan[]) {
    const entitlementPromises = plansList.map(async (plan) => {
      const result = await getEntitlements(facilityId, plan.facility_membership_plan_id);
      if (result.success) {
        return { planId: plan.facility_membership_plan_id, entitlements: result.data };
      }
      return null;
    });

    const results = await Promise.all(entitlementPromises);
    const newEntitlementsMap: Record<number, PlanEntitlements> = {};

    for (const result of results) {
      if (result) {
        newEntitlementsMap[result.planId] = result.entitlements;
      }
    }

    setEntitlementsMap(newEntitlementsMap);
  }

  async function handleDelete(planId: number, planName: string) {
    if (!confirm(`Are you sure you want to deactivate "${planName}"?`)) return;

    const result = await deletePlan(facilityId, planId);

    if (result.success) {
      fetchPlans();
    } else {
      alert(result.error.detail || 'Failed to delete plan');
    }
  }

  function handleCreateClick() {
    // Open template picker first
    setTemplatePickerOpen(true);
  }

  function handleTemplateSelect(template: PlanTemplate | null) {
    setSelectedTemplate(template);
    setTemplatePickerOpen(false);
    setCreateModalOpen(true);
  }

  function handleCreateModalClose() {
    setCreateModalOpen(false);
    setSelectedTemplate(null);
  }

  return (
    <div>
      {/* Header */}
      <div className="flex justify-between items-center mb-6">
        <div>
          <h1 className="text-2xl font-bold text-slate-900">Membership Plans</h1>
          <p className="text-slate-600 mt-1">Create and manage subscription plans for your facility</p>
        </div>
        <button
          onClick={handleCreateClick}
          className="bg-gradient-to-r from-purple-600 to-indigo-600 hover:from-purple-700 hover:to-indigo-700 text-white px-6 py-3 rounded-lg font-semibold shadow-md transition-all duration-200"
        >
          + Create Plan
        </button>
      </div>

      {/* Error Message */}
      {error && (
        <div className="bg-red-50 border border-red-200 text-red-700 px-4 py-3 rounded-lg mb-6">
          {error}
        </div>
      )}

      {/* Plans Grid */}
      {loading ? (
        <PlanListSkeleton count={3} />
      ) : plans.length === 0 ? (
        <div className="text-center py-16">
          <div className="text-6xl mb-4">📋</div>
          <h2 className="text-2xl font-semibold text-slate-900 mb-2">No membership plans yet</h2>
          <p className="text-slate-600 mb-6">Create your first plan to get started</p>
          <button
            onClick={handleCreateClick}
            className="bg-gradient-to-r from-purple-600 to-indigo-600 hover:from-purple-700 hover:to-indigo-700 text-white px-6 py-3 rounded-lg font-semibold shadow-md transition-all duration-200"
          >
            + Create Your First Plan
          </button>
        </div>
      ) : (
        <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6">
          {plans.map(plan => (
            <PlanCard
              key={plan.facility_membership_plan_id}
              plan={plan}
              entitlements={entitlementsMap[plan.facility_membership_plan_id]}
              onEdit={() => setEditingPlan(plan)}
              onDelete={() => handleDelete(plan.facility_membership_plan_id, plan.name)}
              onConfigureEntitlements={() => setConfiguringPlan(plan)}
            />
          ))}
        </div>
      )}

      {/* Template Picker Modal */}
      <TemplatePicker
        isOpen={templatePickerOpen}
        onClose={() => setTemplatePickerOpen(false)}
        onSelect={handleTemplateSelect}
      />

      {/* Create Modal */}
      {createModalOpen && (
        <PlanFormModal
          isOpen={createModalOpen}
          onClose={handleCreateModalClose}
          facilityId={facilityId}
          initialValues={selectedTemplate ? {
            name: selectedTemplate.name,
            billing_period: selectedTemplate.billing_period,
            price_cents: selectedTemplate.suggested_price_cents,
            sport_id: selectedTemplate.sport_id,
            is_active: true
          } : undefined}
          templateName={selectedTemplate?.name}
          onSuccess={fetchPlans}
        />
      )}

      {/* Edit Modal */}
      {editingPlan && (
        <PlanFormModal
          isOpen={!!editingPlan}
          onClose={() => setEditingPlan(null)}
          facilityId={facilityId}
          plan={editingPlan}
          onSuccess={fetchPlans}
        />
      )}

      {/* Entitlements Config Modal */}
      {configuringPlan && (
        <EntitlementsConfigModal
          isOpen={!!configuringPlan}
          onClose={() => setConfiguringPlan(null)}
          facilityId={facilityId}
          plan={configuringPlan}
          onSuccess={fetchPlans}
        />
      )}
    </div>
  );
}