"use client";

import { useEffect, useState } from "react";
import { Upload, Loader2, CheckCircle2, AlertCircle } from "lucide-react";
import { toast } from "sonner";
import { useQueryClient } from "@tanstack/react-query";
import {
  Sheet, SheetContent, SheetHeader, SheetTitle, SheetDescription,
} from "@/components/ui/sheet";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import { Textarea } from "@/components/ui/textarea";
import {
  Select, SelectContent, SelectItem, SelectTrigger, SelectValue,
} from "@/components/ui/select";
import { Progress } from "@/components/ui/progress";
import {
  useUploadPrecedent, libraryKeys,
  type PracticeArea, type SourceType,
} from "@/lib/api/precedent-library";
import { useProgress } from "@/lib/api/documents";
import {
  PRACTICE_AREAS, PRECEDENT_LEVELS, SOURCE_TYPES,
} from "./practice-area";

const ACCEPT = ".pdf,.docx,.doc,.rtf,.txt,.md";

type Props = {
  open: boolean;
  onOpenChange: (open: boolean) => void;
};

export function PrecedentUploadSheet({ open, onOpenChange }: Props) {
  const [file, setFile] = useState<File | null>(null);
  const [citation, setCitation] = useState("");
  const [caseName, setCaseName] = useState("");
  const [court, setCourt] = useState("");
  const [decisionDate, setDecisionDate] = useState("");
  const [sourceType, setSourceType] = useState<SourceType>("");
  const [precedentLevel, setPrecedentLevel] = useState("");
  const [practiceArea, setPracticeArea] = useState<PracticeArea>("");
  const [appealSubtype, setAppealSubtype] = useState("");
  const [subjectTags, setSubjectTags] = useState("");
  const [headnote, setHeadnote] = useState("");
  const [isBinding, setIsBinding] = useState(true);

  const [taskId, setTaskId] = useState<string | null>(null);
  const upload = useUploadPrecedent();
  const progress = useProgress(taskId);
  const qc = useQueryClient();

  // Reset form when the sheet closes — fields, file input, and any in-flight
  // task subscription. We accept the cascade-render warning because resetting
  // form state on close is exactly the intended side effect.
  useEffect(() => {
    if (open) return;
    // eslint-disable-next-line react-hooks/set-state-in-effect
    setFile(null); setCitation(""); setCaseName(""); setCourt("");
    // eslint-disable-next-line react-hooks/set-state-in-effect
    setDecisionDate(""); setSourceType(""); setPrecedentLevel("");
    // eslint-disable-next-line react-hooks/set-state-in-effect
    setPracticeArea(""); setAppealSubtype(""); setSubjectTags("");
    // eslint-disable-next-line react-hooks/set-state-in-effect
    setHeadnote(""); setIsBinding(true); setTaskId(null);
  }, [open]);

  // Auto-close on completion + refresh library list/stats so the new
  // row appears with up-to-date counts (halachot, approved). The mutation's
  // onSuccess fires when POST returns the task_id; we need a second
  // invalidation when SSE reports terminal status, otherwise the table
  // shows stale data.
  useEffect(() => {
    if (progress?.status === "completed") {
      qc.invalidateQueries({ queryKey: libraryKeys.all });
      toast.success("הפסיקה הוכנסה לקורפוס. ההלכות ממתינות לאישור.");
      const t = window.setTimeout(() => onOpenChange(false), 1200);
      return () => window.clearTimeout(t);
    }
    if (progress?.status === "failed") {
      qc.invalidateQueries({ queryKey: libraryKeys.all });
      toast.error(`כשל בעיבוד: ${progress.error || "שגיאה לא ידועה"}`);
    }
  }, [progress, onOpenChange, qc]);

  const onSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    if (!file) {
      toast.error("בחר קובץ");
      return;
    }
    if (!citation.trim()) {
      toast.error("מראה המקום (citation) חובה");
      return;
    }
    if (!practiceArea) {
      toast.error("בחר תחום משפט");
      return;
    }
    try {
      const tags = subjectTags
        .split(",")
        .map((t) => t.trim())
        .filter(Boolean);
      const res = await upload.mutateAsync({
        file,
        citation: citation.trim(),
        case_name: caseName.trim(),
        court: court.trim(),
        decision_date: decisionDate || undefined,
        source_type: sourceType || undefined,
        precedent_level: precedentLevel || undefined,
        practice_area: practiceArea,
        appeal_subtype: appealSubtype.trim(),
        subject_tags: tags,
        is_binding: isBinding,
        headnote: headnote.trim(),
      });
      setTaskId(res.task_id);
    } catch (err) {
      toast.error(err instanceof Error ? err.message : "כשל בהעלאה");
    }
  };

  const isProcessing = taskId !== null && progress?.status !== "completed" && progress?.status !== "failed";
  const stage = (progress as { stage?: string; percent?: number; step?: string } | null)?.stage;
  const percent = (progress as { percent?: number } | null)?.percent ?? 0;

  return (
    <Sheet open={open} onOpenChange={onOpenChange}>
      <SheetContent side="left" className="w-full sm:max-w-2xl overflow-y-auto" dir="rtl">
        <SheetHeader>
          <SheetTitle className="text-navy">העלאת פסיקה לקורפוס הסמכותי</SheetTitle>
          <SheetDescription className="text-ink-muted">
            הקובץ יעבור חילוץ טקסט, יצירת embeddings, וחילוץ הלכות אוטומטי.
            ההלכות יחכו לאישורך לפני שהן זמינות לסוכני הכתיבה.
          </SheetDescription>
        </SheetHeader>

        <form onSubmit={onSubmit} className="px-6 pb-6 space-y-4 mt-4">
          {/* File */}
          <div className="space-y-1">
            <Label htmlFor="file">קובץ (PDF / DOCX / DOC / RTF / TXT / MD)</Label>
            <Input
              id="file" type="file" accept={ACCEPT}
              onChange={(e) => setFile(e.target.files?.[0] ?? null)}
              disabled={isProcessing}
            />
          </div>

          {/* Citation */}
          <div className="space-y-1">
            <Label htmlFor="citation">מראה המקום (חובה)</Label>
            <Input
              id="citation" value={citation}
              onChange={(e) => setCitation(e.target.value)}
              placeholder={`עע"מ 3975/22 ב. קרן-נכסים נ' ועדה מקומית`}
              disabled={isProcessing} dir="rtl"
            />
          </div>

          {/* Two-col grid */}
          <div className="grid grid-cols-2 gap-3">
            <div className="space-y-1">
              <Label htmlFor="case-name">שם קצר</Label>
              <Input id="case-name" value={caseName}
                onChange={(e) => setCaseName(e.target.value)}
                placeholder="ב. קרן-נכסים" disabled={isProcessing} />
            </div>
            <div className="space-y-1">
              <Label htmlFor="court">ערכאה</Label>
              <Input id="court" value={court}
                onChange={(e) => setCourt(e.target.value)}
                placeholder='בית משפט עליון / בג"ץ / מנהלי / ועדת ערר'
                disabled={isProcessing} />
            </div>
            <div className="space-y-1">
              <Label htmlFor="date">תאריך החלטה</Label>
              <Input id="date" type="date" value={decisionDate}
                onChange={(e) => setDecisionDate(e.target.value)}
                disabled={isProcessing} />
            </div>
            <div className="space-y-1">
              <Label htmlFor="appeal-subtype">תת-סוג (חופשי)</Label>
              <Input id="appeal-subtype" value={appealSubtype}
                onChange={(e) => setAppealSubtype(e.target.value)}
                placeholder="שימוש חורג / סופיות ההחלטה" disabled={isProcessing} />
            </div>
          </div>

          {/* Practice area (required radio) */}
          <div className="space-y-1">
            <Label>תחום משפט (חובה)</Label>
            <div className="flex gap-4 flex-wrap">
              {PRACTICE_AREAS.map((a) => (
                <label key={a.value} className="flex items-center gap-2 cursor-pointer">
                  <input
                    type="radio" name="practice_area" value={a.value}
                    checked={practiceArea === a.value}
                    onChange={() => setPracticeArea(a.value as PracticeArea)}
                    disabled={isProcessing}
                  />
                  <span className="text-sm text-ink">{a.label}</span>
                </label>
              ))}
            </div>
          </div>

          <div className="grid grid-cols-2 gap-3">
            <div className="space-y-1">
              <Label htmlFor="source-type">סוג מקור</Label>
              <Select value={sourceType || "_none"}
                onValueChange={(v) => setSourceType(v === "_none" ? "" : v as SourceType)}
                disabled={isProcessing}>
                <SelectTrigger><SelectValue placeholder="—" /></SelectTrigger>
                <SelectContent>
                  <SelectItem value="_none">—</SelectItem>
                  {SOURCE_TYPES.map((s) => (
                    <SelectItem key={s.value} value={s.value}>{s.label}</SelectItem>
                  ))}
                </SelectContent>
              </Select>
            </div>
            <div className="space-y-1">
              <Label htmlFor="precedent-level">רמת תקדים</Label>
              <Select value={precedentLevel || "_none"}
                onValueChange={(v) => setPrecedentLevel(v === "_none" ? "" : v)}
                disabled={isProcessing}>
                <SelectTrigger><SelectValue placeholder="—" /></SelectTrigger>
                <SelectContent>
                  <SelectItem value="_none">—</SelectItem>
                  {PRECEDENT_LEVELS.map((l) => (
                    <SelectItem key={l.value} value={l.value}>{l.label}</SelectItem>
                  ))}
                </SelectContent>
              </Select>
            </div>
          </div>

          <div className="space-y-1">
            <Label htmlFor="tags">תגיות נושא (מופרדות בפסיקים)</Label>
            <Input id="tags" value={subjectTags}
              onChange={(e) => setSubjectTags(e.target.value)}
              placeholder="חניה, קווי בניין, שיקול דעת" disabled={isProcessing} />
          </div>

          <div className="space-y-1">
            <Label htmlFor="headnote">תקציר / headnote (אופציונלי)</Label>
            <Textarea id="headnote" value={headnote} rows={2}
              onChange={(e) => setHeadnote(e.target.value)}
              placeholder="תקציר חופשי שיוצג ברשימה" disabled={isProcessing} dir="rtl" />
          </div>

          <label className="flex items-center gap-2 cursor-pointer">
            <input type="checkbox" checked={isBinding}
              onChange={(e) => setIsBinding(e.target.checked)}
              disabled={isProcessing} />
            <span className="text-sm">הלכה מחייבת</span>
          </label>

          {isProcessing && (
            <div className="rounded-lg border border-rule bg-rule-soft/40 p-4 space-y-2">
              <div className="flex items-center gap-2 text-sm text-navy">
                <Loader2 className="w-4 h-4 animate-spin" />
                <span>{(progress as { step?: string } | null)?.step || stage || "מעבד"}</span>
              </div>
              <Progress value={percent} className="h-1.5" />
            </div>
          )}

          {progress?.status === "completed" && (
            <div className="rounded-lg border border-gold/40 bg-gold-wash p-4 flex items-center gap-2 text-gold-deep text-sm">
              <CheckCircle2 className="w-4 h-4" />
              נכנס לקורפוס. ההלכות ממתינות בתור האישור.
            </div>
          )}

          {progress?.status === "failed" && (
            <div className="rounded-lg border border-danger/40 bg-danger-bg p-4 flex items-center gap-2 text-danger text-sm">
              <AlertCircle className="w-4 h-4" />
              {progress.error || "שגיאה"}
            </div>
          )}

          <div className="flex gap-2 justify-end pt-2">
            <Button type="button" variant="ghost"
              onClick={() => onOpenChange(false)} disabled={upload.isPending}>
              ביטול
            </Button>
            <Button type="submit"
              disabled={upload.isPending || isProcessing}
              className="bg-navy text-parchment hover:bg-navy-soft">
              <Upload className="w-4 h-4 me-1" />
              העלה
            </Button>
          </div>
        </form>
      </SheetContent>
    </Sheet>
  );
}