"use client";

import { useMemo } from "react";
import {
  Accordion,
  AccordionContent,
  AccordionItem,
  AccordionTrigger,
} from "@/components/ui/accordion";
import { Badge } from "@/components/ui/badge";
import { Button } from "@/components/ui/button";
import { Card, CardContent } from "@/components/ui/card";
import { Skeleton } from "@/components/ui/skeleton";
import {
  PARTY_LABELS_HE,
  PRIORITY_LABELS_HE,
  PRIORITY_ORDER,
  useAggregateArguments,
  useLegalArguments,
  type LegalArgument,
  type LegalArgumentParty,
  type LegalArgumentPriority,
} from "@/lib/api/legal-arguments";
import { toast } from "sonner";
import { Loader2, RefreshCw, Sparkles } from "lucide-react";

const PRIORITY_BADGE_TONE: Record<LegalArgumentPriority, string> = {
  threshold: "bg-danger-bg/60 text-danger-strong border-danger/40",
  substantive: "bg-gold-soft/50 text-navy border-gold/40",
  procedural: "bg-rule-soft text-ink border-rule",
  relief: "bg-emerald-50 text-emerald-900 border-emerald-200",
};

function groupByPriority(
  args: LegalArgument[],
): Record<LegalArgumentPriority, LegalArgument[]> {
  const out: Record<LegalArgumentPriority, LegalArgument[]> = {
    threshold: [],
    substantive: [],
    procedural: [],
    relief: [],
  };
  for (const a of args) {
    (out[a.priority] ?? out.substantive).push(a);
  }
  for (const key of PRIORITY_ORDER) {
    out[key].sort((x, y) => x.argument_index - y.argument_index);
  }
  return out;
}

type PartySectionProps = {
  party: LegalArgumentParty;
  args: LegalArgument[];
};

function PartySection({ party, args }: PartySectionProps) {
  const grouped = useMemo(() => groupByPriority(args), [args]);
  return (
    <div className="space-y-3">
      <div className="flex items-baseline justify-between border-b border-rule pb-2">
        <h3 className="text-navy text-base font-semibold">
          {PARTY_LABELS_HE[party] ?? party}
        </h3>
        <span className="text-ink-muted text-xs">
          {args.length} טיעונים
        </span>
      </div>
      {PRIORITY_ORDER.map((priority) => {
        const list = grouped[priority];
        if (!list?.length) return null;
        return (
          <div key={priority} className="space-y-1">
            <div className="flex items-center gap-2">
              <Badge
                variant="outline"
                className={`${PRIORITY_BADGE_TONE[priority]} text-xs`}
              >
                {PRIORITY_LABELS_HE[priority]}
              </Badge>
              <span className="text-ink-muted text-xs">
                {list.length} טיעונים
              </span>
            </div>
            <Accordion type="multiple" className="rounded-md border border-rule bg-surface">
              {list.map((arg) => (
                <AccordionItem key={arg.id} value={arg.id} className="px-3">
                  <AccordionTrigger className="text-start">
                    <div className="flex flex-1 flex-col items-start gap-1">
                      <span className="text-navy text-sm font-medium leading-tight">
                        {arg.argument_index}. {arg.argument_title}
                      </span>
                      {arg.legal_topic && (
                        <span className="text-ink-muted text-xs">
                          {arg.legal_topic}
                        </span>
                      )}
                    </div>
                  </AccordionTrigger>
                  <AccordionContent>
                    <div className="space-y-2 px-1">
                      <p className="text-ink leading-relaxed whitespace-pre-line">
                        {arg.argument_body}
                      </p>
                      {arg.supporting_claims.length > 0 && (
                        <p className="text-ink-muted text-xs">
                          מסתמך על {arg.supporting_claims.length} פרופוזיציות
                          גולמיות.
                        </p>
                      )}
                    </div>
                  </AccordionContent>
                </AccordionItem>
              ))}
            </Accordion>
          </div>
        );
      })}
    </div>
  );
}

type LegalArgumentsPanelProps = {
  caseNumber: string;
};

export function LegalArgumentsPanel({ caseNumber }: LegalArgumentsPanelProps) {
  const { data, isPending, isError, error } = useLegalArguments(caseNumber);
  const aggregate = useAggregateArguments(caseNumber);

  const parties = useMemo<LegalArgumentParty[]>(() => {
    if (!data?.by_party) return [];
    const order: LegalArgumentParty[] = [
      "appellant",
      "respondent",
      "committee",
      "permit_applicant",
      "unknown",
    ];
    return order.filter((p) => (data.by_party[p]?.length ?? 0) > 0);
  }, [data]);

  const handleAggregate = (force: boolean) => {
    aggregate.mutate(force, {
      onSuccess: () => {
        toast.success(
          force
            ? "הופעלה חזרה חישוב טיעונים (force). יסתיים תוך דקה."
            : "הופעל חישוב טיעונים. רענן בעוד דקה.",
        );
      },
      onError: (e) => toast.error(`שגיאה: ${(e as Error).message}`),
    });
  };

  return (
    <Card className="bg-surface border-rule shadow-sm">
      <CardContent className="px-6 py-5 space-y-4">
        <div className="flex items-center justify-between flex-wrap gap-3">
          <div>
            <h2 className="text-navy text-base font-semibold">
              טיעונים משפטיים
            </h2>
            <p className="text-ink-muted text-xs mt-0.5">
              טיעונים מאוגדים מתוך הפרופוזיציות הגולמיות, מקובצים לפי צד וקדימות.
            </p>
          </div>
          <div className="flex items-center gap-2">
            <Button
              variant="outline"
              size="sm"
              disabled={aggregate.isPending}
              onClick={() => handleAggregate(false)}
            >
              {aggregate.isPending ? (
                <Loader2 className="w-3.5 h-3.5 animate-spin me-1.5" />
              ) : (
                <Sparkles className="w-3.5 h-3.5 me-1.5" />
              )}
              חשב טיעונים
            </Button>
            <Button
              variant="ghost"
              size="sm"
              disabled={aggregate.isPending || !data?.total}
              onClick={() => handleAggregate(true)}
              title="חישוב מחדש (מוחק טיעונים קיימים)"
            >
              <RefreshCw className="w-3.5 h-3.5" />
            </Button>
          </div>
        </div>

        {isPending ? (
          <div className="space-y-2">
            <Skeleton className="h-6 w-48" />
            <Skeleton className="h-20 w-full" />
            <Skeleton className="h-20 w-full" />
          </div>
        ) : isError ? (
          <p className="text-danger text-sm">
            שגיאה בטעינת טיעונים: {(error as Error).message}
          </p>
        ) : !data?.total ? (
          <p className="text-ink-muted text-sm">
            אין טיעונים מאוגדים עדיין. לחץ &ldquo;חשב טיעונים&rdquo; כדי להריץ את ה-aggregator.
          </p>
        ) : (
          <div className="space-y-6">
            {parties.map((party) => (
              <PartySection
                key={party}
                party={party}
                args={data.by_party[party] ?? []}
              />
            ))}
          </div>
        )}
      </CardContent>
    </Card>
  );
}