"use client";

import { useState, useCallback } from "react";
import { trpc } from "~/lib/trpc/client.js";
import { SuccessToast } from "~/components/ui/SuccessToast.js";
import { StaffingSearchForm } from "./StaffingSearchForm.js";
import { ScoringExplanation } from "./ScoringExplanation.js";
import { StaffingResultsList } from "./StaffingResultsList.js";

export function StaffingPanel() {
  const [requiredSkills, setRequiredSkills] = useState<string[]>(["TypeScript", "React"]);
  const [startDate, setStartDate] = useState(() => {
    const d = new Date();
    return `${d.getFullYear()}-${String(d.getMonth() + 1).padStart(2, "0")}-${String(d.getDate()).padStart(2, "0")}`;
  });
  const [endDate, setEndDate] = useState(() => {
    const d = new Date(Date.now() + 90 * 24 * 60 * 60 * 1000);
    return `${d.getFullYear()}-${String(d.getMonth() + 1).padStart(2, "0")}-${String(d.getDate()).padStart(2, "0")}`;
  });
  const [hoursPerDay, setHoursPerDay] = useState(8);
  const [submitted, setSubmitted] = useState(false);
  const [assignedIds, setAssignedIds] = useState<Set<string>>(new Set());
  const [toast, setToast] = useState<{ show: boolean; message: string; variant: "success" | "warning" }>({
    show: false,
    message: "",
    variant: "success",
  });

  const clearToast = useCallback(() => setToast((t) => ({ ...t, show: false })), []);

  const { data: suggestions, isLoading } = trpc.staffing.getSuggestions.useQuery(
    {
      requiredSkills,
      startDate: new Date(startDate),
      endDate: new Date(endDate),
      hoursPerDay,
    },
    { enabled: submitted },
  );

  const handleAssigned = useCallback((resourceId: string, resourceName: string) => {
    setAssignedIds((prev) => new Set(prev).add(resourceId));
    setToast({ show: true, message: `${resourceName} assigned successfully`, variant: "success" });
  }, []);

  const searchCriteria = { startDate, endDate, hoursPerDay };

  return (
    <div className="app-page space-y-6">
      <SuccessToast show={toast.show} message={toast.message} variant={toast.variant} onDone={clearToast} />

      <div className="app-page-header gap-4">
        <div className="space-y-3">
          <span className="inline-flex items-center rounded-full border border-brand-200 bg-brand-50 px-3 py-1 text-[11px] font-semibold uppercase tracking-[0.24em] text-brand-700 dark:border-brand-900/60 dark:bg-brand-900/30 dark:text-brand-200">
            Staffing
          </span>
          <div>
            <h1 className="app-page-title">Staffing Suggestions</h1>
            <p className="app-page-subtitle max-w-2xl">
              Match open work with the strongest available people based on skills, availability, utilization, and cost.
            </p>
          </div>
        </div>
        <div className="app-surface max-w-xl p-4">
          <p className="text-sm font-medium text-gray-900 dark:text-gray-100">How scoring works</p>
          <p className="mt-1 text-sm text-gray-500">
            CapaKraken blends skill fit, free capacity, cost, and current utilization. Add the must-have skills first, then narrow the date window to get cleaner results.
          </p>
        </div>
      </div>

      <div className="grid grid-cols-1 gap-6 xl:grid-cols-[360px_minmax(0,1fr)]">
        <div className="space-y-6">
          <StaffingSearchForm
            requiredSkills={requiredSkills}
            onSkillsChange={setRequiredSkills}
            startDate={startDate}
            onStartDateChange={setStartDate}
            endDate={endDate}
            onEndDateChange={setEndDate}
            hoursPerDay={hoursPerDay}
            onHoursPerDayChange={setHoursPerDay}
            onSubmit={() => setSubmitted(true)}
          />
          <ScoringExplanation />
        </div>

        <StaffingResultsList
          suggestions={suggestions}
          isLoading={isLoading}
          submitted={submitted}
          searchCriteria={searchCriteria}
          assignedIds={assignedIds}
          onAssigned={handleAssigned}
          onError={(msg) => setToast({ show: true, message: msg, variant: "warning" })}
        />
      </div>
    </div>
  );
}