"use client"

import * as React from "react"
import { BanknoteIcon, TrendingUpIcon, UsersIcon } from "lucide-react"

import { getAttendanceCounts } from "@/lib/api/attendance"
import { getMemberInvoices } from "@/lib/api/invoices"
import { getMonthlyRevenue, getStatSummary } from "@/lib/api/stats"
import { formatCurrency } from "@/lib/format"
import {
  DEMO_ATTENDANCE_COUNTS,
  DEMO_REVENUE,
  DEMO_STAT_SUMMARY,
  DEMO_SUBSCRIPTIONS,
} from "@/lib/demo/mock-data"
import { useFetch } from "@/lib/use-fetch"
import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs"
import { AttendanceChartCard } from "@/components/hexa/attendance-chart-card"
import { PageHeader } from "@/components/hexa/page-header"
import { RevenueChartCard } from "@/components/hexa/revenue-chart-card"
import { StatCard } from "@/components/hexa/stat-card"
import { ProfitLossView } from "@/components/hexa/views/profit-loss-view"

interface ReportsViewProps {
  /** Sandbox demo mode: local in-memory data, no API calls. */
  demo?: boolean
}

function ReportsView({ demo = false }: ReportsViewProps) {
  const summary = useFetch(demo ? async () => DEMO_STAT_SUMMARY : getStatSummary)
  const revenue = useFetch(demo ? async () => DEMO_REVENUE : getMonthlyRevenue)
  const counts = useFetch(demo ? async () => DEMO_ATTENDANCE_COUNTS : () => getAttendanceCounts())
  const invoices = useFetch(demo ? async () => [] : getMemberInvoices)

  const paidTotal = demo
    ? DEMO_SUBSCRIPTIONS.filter((s) => s.paymentStatus === "Paid").reduce((sum, s) => sum + s.paidAmount, 0)
    : (invoices.data ?? [])
        .filter((i) => i.status.toLowerCase() === "paid")
        .reduce((sum, i) => sum + i.amount, 0)
  const pendingTotal = demo
    ? DEMO_SUBSCRIPTIONS.filter((s) => s.paymentStatus !== "Paid").reduce((sum, s) => sum + s.balance, 0)
    : (invoices.data ?? [])
        .filter((i) => i.status.toLowerCase() === "pending")
        .reduce((sum, i) => sum + i.amount, 0)

  const growthHint = (pct: number) => `${pct >= 0 ? "+" : ""}${pct.toFixed(1)}% vs last month`

  return (
    <div className="flex flex-col gap-4">
      <PageHeader title="Reports" description="Revenue, attendance, and member trends" />

      <div className="grid grid-cols-2 gap-3 lg:grid-cols-4">
        <StatCard
          icon={BanknoteIcon}
          tone="green"
          label="Total Revenue"
          value={formatCurrency(summary.data?.totalRevenue ?? 0)}
          hint="All time"
        />
        <StatCard
          icon={TrendingUpIcon}
          tone="blue"
          label="This Month"
          value={formatCurrency(summary.data?.thisMonthRevenue ?? 0)}
          hint={growthHint(summary.data?.revenueGrowthPercentage ?? 0)}
        />
        <StatCard
          icon={UsersIcon}
          label="Total Members"
          value={summary.data?.totalCustomerCount ?? 0}
          hint={growthHint(summary.data?.customerGrowthPercentage ?? 0)}
        />
        <StatCard
          icon={BanknoteIcon}
          tone="amber"
          label="Outstanding"
          value={formatCurrency(pendingTotal)}
          hint={`${formatCurrency(paidTotal)} collected`}
        />
      </div>

      <Tabs defaultValue="revenue">
        <TabsList className="w-full sm:w-auto">
          <TabsTrigger value="revenue" className="flex-1 sm:flex-none">Revenue</TabsTrigger>
          <TabsTrigger value="attendance" className="flex-1 sm:flex-none">Attendance</TabsTrigger>
          <TabsTrigger value="members" className="flex-1 sm:flex-none">Members</TabsTrigger>
          <TabsTrigger value="profit-loss" className="flex-1 sm:flex-none">Profit &amp; Loss</TabsTrigger>
        </TabsList>

        <TabsContent value="revenue" className="mt-3">
          <RevenueChartCard data={revenue.data} loading={demo ? false : revenue.loading} title="Monthly revenue (12 months)" />
        </TabsContent>

        <TabsContent value="attendance" className="mt-3">
          <AttendanceChartCard
            data={counts.data}
            loading={demo ? false : counts.loading}
            title="Most active members (this month)"
            limit={10}
          />
        </TabsContent>

        <TabsContent value="members" className="mt-3">
          <div className="grid grid-cols-2 gap-3 lg:grid-cols-4">
            <StatCard
              icon={UsersIcon}
              label="Total"
              value={summary.data?.totalCustomerCount ?? 0}
              hint="All members"
            />
            <StatCard
              icon={UsersIcon}
              tone="blue"
              label="This Month"
              value={summary.data?.thisMonthCustomerCount ?? 0}
              hint="New joiners"
            />
            <StatCard
              icon={UsersIcon}
              tone="amber"
              label="Last Month"
              value={summary.data?.lastMonthCustomerCount ?? 0}
              hint="Previous period"
            />
            <StatCard
              icon={TrendingUpIcon}
              tone="green"
              label="Growth"
              value={`${(summary.data?.customerGrowthPercentage ?? 0).toFixed(1)}%`}
              hint="Month over month"
            />
          </div>
        </TabsContent>

        <TabsContent value="profit-loss" className="mt-3">
          <ProfitLossView demo={demo} />
        </TabsContent>
      </Tabs>
    </div>
  )
}

export { ReportsView }