import { Icon } from "../Icon";

type StepStatus = "pending" | "running" | "completed" | "error";

interface ThinkingCardProps {
  title: string;
  overview: string;
  steps: Array<{
    id: number;
    title: string;
    description: string;
    status: StepStatus;
    sub_steps: Array<{
      id: string;
      description: string;
      status: StepStatus;
    }>;
  }>;
  currentStep: number;
  isComplete: boolean;
}

function statusIcon(status: StepStatus) {
  switch (status) {
    case "running":
      return <Icon name="Loader2" size={16} strokeWidth={2} className="animate-spin text-amber-400" aria-hidden="true" />;
    case "completed":
      return <Icon name="CheckCircle2" size={16} strokeWidth={2} className="text-emerald-400" aria-hidden="true" />;
    case "error":
      return <Icon name="XCircle" size={16} strokeWidth={2} className="text-rose-400" aria-hidden="true" />;
    default:
      return <Icon name="Circle" size={16} strokeWidth={2} className="text-zinc-500" aria-hidden="true" />;
  }
}

function miniIcon(status: StepStatus) {
  switch (status) {
    case "running":
      return <Icon name="Loader2" size={12} strokeWidth={2} className="animate-spin text-amber-400" aria-hidden="true" />;
    case "completed":
      return <Icon name="CheckCircle2" size={12} strokeWidth={2} className="text-emerald-400" aria-hidden="true" />;
    case "error":
      return <Icon name="XCircle" size={12} strokeWidth={2} className="text-rose-400" aria-hidden="true" />;
    default:
      return <span className="mt-0.5 h-2 w-2 rounded-full border border-zinc-600 bg-zinc-700" aria-hidden="true" />;
  }
}

function tone(status: StepStatus) {
  switch (status) {
    case "running":
      return "border-amber-500/20 bg-amber-500/10 text-amber-300";
    case "completed":
      return "border-emerald-500/20 bg-emerald-500/10 text-emerald-300";
    case "error":
      return "border-rose-500/20 bg-rose-500/10 text-rose-300";
    default:
      return "border-zinc-800 bg-zinc-900 text-zinc-400";
  }
}

export default function ThinkingCard({ title, overview, steps, currentStep, isComplete }: ThinkingCardProps) {
  const completedCount = steps.filter((step) => step.status === "completed").length;
  const progress = isComplete || steps.length === 0 ? 100 : Math.round((completedCount / steps.length) * 100);
  const activeLabel = isComplete ? "Plano de Execução" : "Thinking...";

  return (
    <section className="overflow-hidden rounded-3xl border border-zinc-800/80 bg-zinc-950 text-zinc-100 shadow-[0_24px_80px_-36px_rgba(0,0,0,0.9)]">
      <div className="border-b border-zinc-800/80 bg-gradient-to-b from-zinc-900/80 to-zinc-950 px-5 py-4">
        <div className="flex items-start justify-between gap-4">
          <div className="min-w-0">
            <div className="flex items-center gap-2">
              <span className="inline-flex items-center rounded-full border border-zinc-700 bg-zinc-900 px-2.5 py-0.5 text-[11px] font-medium uppercase tracking-[0.2em] text-zinc-300">
                {activeLabel}
              </span>
              <span className="text-xs uppercase tracking-[0.22em] text-zinc-500">Agentic mode</span>
            </div>
            <h2 className="mt-2 truncate text-lg font-semibold text-zinc-50">{title}</h2>
            <p className="mt-1 text-sm leading-6 text-zinc-400">{overview}</p>
          </div>

          <div className="rounded-2xl border border-zinc-800 bg-zinc-900/80 px-3 py-2 text-right">
            <div className="text-[11px] uppercase tracking-[0.18em] text-zinc-500">Progress</div>
            <div className="mt-1 text-xl font-semibold tabular-nums text-zinc-50">{progress}%</div>
          </div>
        </div>

        <div className="mt-4 space-y-2">
          <div className="h-2 overflow-hidden rounded-full bg-zinc-800">
            <div
              className="h-full rounded-full bg-gradient-to-r from-zinc-500 via-zinc-300 to-emerald-400 transition-all duration-500 ease-out"
              style={{ width: `${progress}%` }}
            />
          </div>
          <div className="flex items-center justify-between text-[11px] uppercase tracking-[0.18em] text-zinc-500">
            <span>{steps.length} steps</span>
            <span>{isComplete ? "Completed" : `Step ${currentStep}`}</span>
          </div>
        </div>
      </div>

      <div className="p-4 sm:p-5">
        <ul className="space-y-3">
          {steps.map((step, index) => {
            const isActive = step.id === currentStep || step.status === "running";
            const isDone = step.status === "completed";

            return (
              <li
                key={step.id}
                className={`relative rounded-2xl border px-4 py-4 transition-all duration-300 ${
                  isActive ? "border-zinc-700 bg-zinc-900/80 shadow-[0_0_0_1px_rgba(63,63,70,0.35)]" : "border-zinc-800 bg-zinc-950/70"
                } ${isDone ? "opacity-95" : ""}`}
                aria-current={isActive ? "step" : undefined}
              >
                {index !== steps.length - 1 ? <div className="absolute left-[26px] top-12 bottom-0 w-px bg-zinc-800" aria-hidden="true" /> : null}

                <div className="flex gap-3">
                  <div className={`mt-0.5 flex h-9 w-9 shrink-0 items-center justify-center rounded-full border ${tone(step.status)}`}>
                    {statusIcon(step.status)}
                  </div>

                  <div className="min-w-0 flex-1">
                    <div className="flex items-start justify-between gap-3">
                      <div className="min-w-0">
                        <div className="flex items-center gap-2">
                          <span className="rounded-md border border-zinc-800 bg-zinc-900 px-2 py-0.5 text-xs font-medium text-zinc-300">
                            Step {step.id}
                          </span>
                          <h3 className="truncate text-sm font-semibold text-zinc-100">{step.title}</h3>
                        </div>
                        <p className="mt-1 text-sm leading-6 text-zinc-400">{step.description}</p>
                      </div>

                      <span className={`shrink-0 rounded-full border px-2.5 py-0.5 text-[11px] font-medium uppercase tracking-[0.18em] ${tone(step.status)}`}>
                        {step.status}
                      </span>
                    </div>

                    {step.sub_steps.length > 0 ? (
                      <div className="mt-4 space-y-2 border-l border-zinc-800 pl-4">
                        {step.sub_steps.map((subStep) => (
                          <div key={subStep.id} className="flex items-start gap-2 rounded-xl border border-zinc-900 bg-zinc-950/60 px-3 py-2">
                            <div className="mt-0.5">{miniIcon(subStep.status)}</div>
                            <div className="min-w-0 flex-1">
                              <div className="text-xs font-medium uppercase tracking-[0.16em] text-zinc-500">{subStep.id}</div>
                              <div className="text-sm leading-6 text-zinc-200">{subStep.description}</div>
                            </div>
                            <span className={`rounded-full border px-2 py-0.5 text-[11px] font-medium uppercase tracking-[0.16em] ${tone(subStep.status)}`}>
                              {subStep.status}
                            </span>
                          </div>
                        ))}
                      </div>
                    ) : null}
                  </div>
                </div>
              </li>
            );
          })}
        </ul>
      </div>
    </section>
  );
}