import {
  AlertCircle,
  ArrowDownRight,
  ArrowUpRight,
  CheckSquare,
  Receipt,
  Users,
  Wallet,
} from "lucide-react";

import { Card, CardContent } from "@/components/ui/card";
import { formatTRY } from "@/lib/format";
import { cn } from "@/lib/utils";

import type { DashboardData } from "@/lib/appwrite/dashboard-queries";

function delta(current: number, previous: number): { pct: number; positive: boolean } | null {
  if (previous === 0) {
    if (current === 0) return null;
    return { pct: 100, positive: true };
  }
  const pct = ((current - previous) / previous) * 100;
  return { pct: Math.abs(pct), positive: pct >= 0 };
}

export function Metrics({ data }: { data: DashboardData["metrics"] }) {
  const incomeDelta = delta(data.monthIncome, data.prevMonthIncome);

  const cards = [
    {
      label: "Müşteriler",
      value: String(data.totalCustomers),
      sub: `${data.activeCustomers} aktif`,
      icon: Users,
      tone: "default",
    },
    {
      label: "Bu ayki gelir",
      value: formatTRY(data.monthIncome),
      sub: incomeDelta
        ? `${incomeDelta.positive ? "+" : "−"}${incomeDelta.pct.toFixed(1)}% önceki ay`
        : "Geçen ay veri yok",
      icon: Wallet,
      tone: "income",
      trend: incomeDelta,
    },
    {
      label: "Bekleyen tahsilat",
      value: formatTRY(data.outstanding),
      sub:
        data.overdueCount > 0
          ? `${data.overdueCount} vadesi geçmiş`
          : "Vadesi geçmiş yok",
      icon: Receipt,
      tone: data.overdueCount > 0 ? "warning" : "default",
    },
    {
      label: "Açık görevlerim",
      value: String(data.openTasks),
      sub:
        data.urgentTasks > 0
          ? `${data.urgentTasks} acil`
          : data.openTasks === 0
            ? "Hepsi tamam"
            : "Atanmış + atanmamış",
      icon: CheckSquare,
      tone: data.urgentTasks > 0 ? "warning" : "default",
    },
  ];

  const toneClass: Record<string, string> = {
    default: "text-muted-foreground",
    income: "text-emerald-600 dark:text-emerald-400",
    warning: "text-amber-600 dark:text-amber-400",
  };

  return (
    <div className="grid gap-4 sm:grid-cols-2 @5xl:grid-cols-4">
      {cards.map((c) => {
        const Icon = c.icon;
        return (
          <Card key={c.label}>
            <CardContent className="flex items-start justify-between p-5">
              <div>
                <p className="text-muted-foreground text-xs uppercase tracking-wide">
                  {c.label}
                </p>
                <p className="mt-2 text-2xl font-semibold tabular-nums">{c.value}</p>
                <p
                  className={cn(
                    "mt-1 flex items-center gap-1 text-xs",
                    c.tone === "warning" && data.overdueCount + data.urgentTasks > 0
                      ? "text-amber-600 dark:text-amber-400"
                      : "text-muted-foreground",
                  )}
                >
                  {c.trend &&
                    (c.trend.positive ? (
                      <ArrowUpRight className="text-emerald-600 dark:text-emerald-400 size-3" />
                    ) : (
                      <ArrowDownRight className="text-red-600 dark:text-red-400 size-3" />
                    ))}
                  {c.tone === "warning" && data.overdueCount + data.urgentTasks > 0 && (
                    <AlertCircle className="size-3" />
                  )}
                  {c.sub}
                </p>
              </div>
              <Icon className={cn("size-5", toneClass[c.tone])} />
            </CardContent>
          </Card>
        );
      })}
    </div>
  );
}
