import React from "react";
import type { DomainType } from "../engine/shared/types";
import type { ScenarioMeta } from "../scenarios/types";

interface AppHeaderProps {
  currentDomain: "all" | DomainType;
  onSelectDomain: (domain: "all" | DomainType) => void;
  currentScenarioId?: string;
  scenarios?: readonly { meta: ScenarioMeta }[];
  onSelectScenario?: (scenarioId: string) => void;
}

const DOMAIN_OPTIONS: { id: "all" | DomainType; label: string }[] = [
  { id: "all", label: "Tất cả" },
  { id: "micro", label: "Kinh tế Vi mô" },
  { id: "macro", label: "Kinh tế Vĩ mô" },
  { id: "bridge", label: "Cầu nối Vi • Vĩ mô" },
];

export const AppHeader: React.FC<AppHeaderProps> = ({
  currentDomain,
  onSelectDomain,
  currentScenarioId,
  scenarios = [],
  onSelectScenario,
}) => {
  const filteredScenarios = scenarios.filter((s) => {
    if (currentDomain === "all") return true;
    if (currentDomain === "bridge") {
      return (
        s.meta.domain === "bridge" ||
        s.meta.id === "micro.consumer.corner_solution"
      );
    }
    return s.meta.domain === currentDomain;
  });

  return (
    <header className="border-b border-slate-200 bg-white shadow-xs">
      {/* Top Banner */}
      <div className="mx-auto max-w-7xl px-4 py-3 sm:px-6 lg:px-8">
        <div className="flex flex-col gap-3 md:flex-row md:items-center md:justify-between">
          <div className="flex items-center gap-3">
            <div className="flex h-10 w-10 items-center justify-center rounded-lg bg-indigo-600 text-white font-bold text-lg shadow-sm">
              ES
            </div>
            <div>
              <h1 className="text-lg font-bold text-slate-900 tracking-tight sm:text-xl">
                EconSim • Mô phỏng Kinh tế học Tương tác (FSPPM MPP28)
              </h1>
              <p className="text-xs text-slate-500">
                Nền tảng phân tích thực nghiệm và mô phỏng chính sách công
              </p>
            </div>
          </div>

          {/* Domain Filter Pills */}
          <div className="flex flex-wrap items-center gap-1.5 rounded-lg bg-slate-100 p-1">
            {DOMAIN_OPTIONS.map((opt) => {
              const isActive = currentDomain === opt.id;
              return (
                <button
                  key={opt.id}
                  type="button"
                  onClick={() => onSelectDomain(opt.id)}
                  className={`rounded-md px-3 py-1 text-xs font-semibold transition-all ${
                    isActive
                      ? "bg-white text-indigo-700 shadow-xs"
                      : "text-slate-600 hover:text-slate-900 hover:bg-slate-200/60"
                  }`}
                >
                  {opt.label}
                </button>
              );
            })}
          </div>
        </div>

        {/* Module Selector Pills / Tabs */}
        {filteredScenarios.length > 0 && (
          <div className="mt-3 flex items-center gap-2 overflow-x-auto pb-1 scrollbar-thin">
            <span className="text-xs font-semibold text-slate-400 whitespace-nowrap">
              Chủ đề:
            </span>
            <div className="flex items-center gap-2">
              {filteredScenarios.map((sc) => {
                const isSelected = currentScenarioId === sc.meta.id;
                return (
                  <button
                    key={sc.meta.id}
                    type="button"
                    onClick={() => onSelectScenario?.(sc.meta.id)}
                    className={`flex items-center gap-2 rounded-lg px-3 py-1.5 text-xs font-medium whitespace-nowrap transition-all border ${
                      isSelected
                        ? "border-indigo-600 bg-indigo-50/70 text-indigo-900 shadow-xs"
                        : "border-slate-200 bg-white text-slate-600 hover:border-slate-300 hover:bg-slate-50"
                    }`}
                  >
                    <span className="font-semibold">{sc.meta.title}</span>
                    <span
                      className={`rounded-md px-1.5 py-0.5 text-[10px] font-bold ${
                        isSelected
                          ? "bg-indigo-600 text-white"
                          : "bg-slate-100 text-slate-600"
                      }`}
                    >
                      {sc.meta.chapter}
                    </span>
                  </button>
                );
              })}
            </div>
          </div>
        )}
      </div>
    </header>
  );
};