// Analytics dashboard demo with monthly breakdown

import {
  ContributionGraph,
  ContributionGraphGrid,
  ContributionGraphTooltip,
  ContributionGraphLegend,
  type ContributionData,
} from "@/components/ui/contribution-graph";

function generateSampleData(): ContributionData[] {
  const data: ContributionData[] = [];
  const endDate = new Date();
  const startDate = new Date();
  startDate.setFullYear(startDate.getFullYear() - 1);

  const current = new Date(startDate);
  while (current <= endDate) {
    const dayOfWeek = current.getDay();
    const month = current.getMonth();
    const isWeekend = dayOfWeek === 0 || dayOfWeek === 6;

    // Simulate seasonal patterns - more activity in certain months
    const seasonalMultiplier =
      month >= 8 && month <= 11 ? 1.3 : month >= 3 && month <= 5 ? 1.1 : 0.9;
    const baseChance = (isWeekend ? 0.3 : 0.6) * seasonalMultiplier;

    if (Math.random() < baseChance) {
      data.push({
        date: current.toISOString().split("T")[0],
        count: Math.floor(Math.random() * 15 * seasonalMultiplier) + 1,
      });
    }
    current.setDate(current.getDate() + 1);
  }
  return data;
}

const sampleData = generateSampleData();
const endDate = new Date();
const startDate = new Date();
startDate.setFullYear(startDate.getFullYear() - 1);
startDate.setDate(startDate.getDate() + 1);

// Calculate monthly stats
const monthlyStats = (() => {
  const months: Record<string, { count: number; days: number }> = {};

  sampleData.forEach((d) => {
    const monthKey = d.date.substring(0, 7); // YYYY-MM
    if (!months[monthKey]) {
      months[monthKey] = { count: 0, days: 0 };
    }
    months[monthKey].count += d.count;
    months[monthKey].days += 1;
  });

  return Object.entries(months)
    .sort(([a], [b]) => b.localeCompare(a))
    .slice(0, 6)
    .map(([month, stats]) => ({
      month: new Date(month + "-01").toLocaleDateString("en-US", {
        month: "short",
      }),
      ...stats,
    }));
})();

const totalContributions = sampleData.reduce((sum, d) => sum + d.count, 0);
const maxMonthly = Math.max(...monthlyStats.map((m) => m.count));

export default function DemoAnalytics() {
  return (
    <div className="w-full max-w-4xl p-6 space-y-6">
      {/* Header */}
      <div className="flex items-center justify-between">
        <div>
          <h3 className="text-lg font-semibold text-foreground">
            Activity Overview
          </h3>
          <p className="text-sm text-muted-foreground">
            Your contribution history over the past year
          </p>
        </div>
        <div className="text-right">
          <div className="text-3xl font-bold text-foreground tabular-nums">
            {totalContributions.toLocaleString()}
          </div>
          <div className="text-xs text-muted-foreground">total contributions</div>
        </div>
      </div>

      {/* Graph */}
      <div
        className="rounded-xl border bg-card p-4"
        style={{
          "--contribution-empty": "oklch(0.95 0.02 260)",
          "--contribution-level-1": "oklch(0.8 0.15 260)",
          "--contribution-level-2": "oklch(0.65 0.2 260)",
          "--contribution-level-3": "oklch(0.5 0.22 260)",
          "--contribution-level-4": "oklch(0.4 0.2 260)",
        } as React.CSSProperties}
      >
        <ContributionGraph
          data={sampleData}
          startDate={startDate.toISOString().split("T")[0]}
          endDate={endDate.toISOString().split("T")[0]}
          formatCount={(count) => `${count} events`}
        >
          <ContributionGraphGrid />
          <ContributionGraphTooltip className="backdrop-blur-sm bg-popover/95" />
          <div className="mt-4 flex items-center justify-between border-t pt-3">
            <div className="flex items-center gap-4 text-xs text-muted-foreground">
              <span>
                <span className="font-medium text-foreground">
                  {sampleData.length}
                </span>{" "}
                active days
              </span>
              <span>
                <span className="font-medium text-foreground">
                  {(totalContributions / 365).toFixed(1)}
                </span>{" "}
                avg/day
              </span>
            </div>
            <ContributionGraphLegend />
          </div>
        </ContributionGraph>
      </div>

      {/* Monthly Breakdown */}
      <div className="rounded-xl border bg-card p-4">
        <h4 className="text-sm font-medium text-foreground mb-3">
          Monthly Breakdown
        </h4>
        <div className="space-y-2">
          {monthlyStats.map((stat) => (
            <div key={stat.month} className="flex items-center gap-3">
              <div className="w-10 text-xs text-muted-foreground font-medium">
                {stat.month}
              </div>
              <div className="flex-1 h-6 bg-muted rounded-md overflow-hidden">
                <div
                  className="h-full bg-primary/80 rounded-md transition-all duration-500"
                  style={{ width: `${(stat.count / maxMonthly) * 100}%` }}
                />
              </div>
              <div className="w-16 text-right">
                <span className="text-sm font-medium text-foreground tabular-nums">
                  {stat.count}
                </span>
                <span className="text-xs text-muted-foreground ml-1">
                  ({stat.days}d)
                </span>
              </div>
            </div>
          ))}
        </div>
      </div>
    </div>
  );
}