"use client";

import { AlertTriangle, CheckCircle2, Loader2, Upload } from "lucide-react";
import { useMemo, useState } from "react";
import { toast } from "sonner";
import { createCatalogItem } from "@/actions/catalog-items";
import { Badge } from "@/components/ui/badge";
import { Button } from "@/components/ui/button";
import { Dialog, DialogContent, DialogHeader, DialogTitle, DialogTrigger } from "@/components/ui/dialog";
import { Label } from "@/components/ui/label";
import { Textarea } from "@/components/ui/textarea";

interface ParsedRow {
  lineNumber: number;
  raw: string;
  ok: boolean;
  error?: string;
  baseId?: number;
  credits?: number;
  points?: number;
  pointsType?: number;
}

interface BulkImportItemsProps {
  pageId: number;
  onImported?: () => void;
}

export function BulkImportItems({ pageId, onImported }: BulkImportItemsProps) {
  const [open, setOpen] = useState(false);
  const [input, setInput] = useState("");
  const [importing, setImporting] = useState(false);

  const parsed = useMemo<ParsedRow[]>(() => {
    const lines = input.split("\n");
    const out: ParsedRow[] = [];
    lines.forEach((raw, idx) => {
      const trimmed = raw.trim();
      if (!trimmed || trimmed.startsWith("#")) return;
      const parts = trimmed.split(/[,\s;]+/).filter(Boolean);
      const baseId = parseInt(parts[0], 10);
      if (Number.isNaN(baseId) || baseId <= 0) {
        out.push({ lineNumber: idx + 1, raw: trimmed, ok: false, error: "Invalid base ID" });
        return;
      }
      const credits = parts[1] !== undefined ? parseInt(parts[1], 10) : 0;
      const points = parts[2] !== undefined ? parseInt(parts[2], 10) : 0;
      const pointsType = parts[3] !== undefined ? parseInt(parts[3], 10) : 0;
      if (
        (parts[1] !== undefined && Number.isNaN(credits)) ||
        (parts[2] !== undefined && Number.isNaN(points))
      ) {
        out.push({ lineNumber: idx + 1, raw: trimmed, ok: false, error: "Invalid number" });
        return;
      }
      out.push({
        lineNumber: idx + 1,
        raw: trimmed,
        ok: true,
        baseId,
        credits,
        points,
        pointsType,
      });
    });
    return out;
  }, [input]);

  const validCount = parsed.filter((r) => r.ok).length;
  const invalidCount = parsed.length - validCount;

  async function handleImport() {
    const valid = parsed.filter((r) => r.ok);
    if (valid.length === 0) {
      toast.error("No valid rows to import");
      return;
    }
    setImporting(true);
    let success = 0;
    let failed = 0;
    for (const row of valid) {
      try {
        const res = await createCatalogItem({
          pageId,
          itemIds: String(row.baseId!),
          catalogName: "",
          costCredits: row.credits ?? 0,
          costPoints: row.points ?? 0,
          pointsType: row.pointsType ?? 0,
          amount: 1,
          limitedSells: 0,
          limitedStack: 0,
          orderNumber: 1,
          offerId: -1,
          songId: 0,
          haveOffer: "1",
          clubOnly: "0",
          extradata: "",
        });
        if (res.ok) success++;
        else failed++;
      } catch {
        failed++;
      }
    }
    setImporting(false);
    if (success > 0) {
      toast.success(`Imported ${success} item(s)${failed > 0 ? `, ${failed} failed` : ""}.`);
      setInput("");
      setOpen(false);
      onImported?.();
    } else {
      toast.error(`All ${failed} imports failed.`);
    }
  }

  return (
    <Dialog open={open} onOpenChange={setOpen}>
      <DialogTrigger asChild>
        <Button variant="outline" size="sm">
          <Upload className="mr-2 h-4 w-4" />
          Bulk Import
        </Button>
      </DialogTrigger>
      <DialogContent className="max-w-2xl">
        <DialogHeader>
          <DialogTitle>Bulk Import Items</DialogTitle>
        </DialogHeader>

        <div className="space-y-3">
          <div className="space-y-2">
            <Label>Item list</Label>
            <Textarea
              value={input}
              onChange={(e) => setInput(e.target.value)}
              placeholder={`One per line: base_id[, credits[, points[, points_type]]]\n# Lines starting with # are ignored\n12345, 50\n12346, 0, 10, 5\n12347`}
              rows={10}
              className="font-mono text-xs"
            />
            <p className="text-[11px] text-muted-foreground">
              Format: <code className="rounded bg-muted px-1">base_id, credits, points, points_type</code>.
              Only <code>base_id</code> is required; other fields default to 0. Separators: comma, space, or
              semicolon.
            </p>
          </div>

          {parsed.length > 0 && (
            <div className="space-y-2">
              <div className="flex items-center gap-3 text-xs">
                <Badge variant="default" className="gap-1">
                  <CheckCircle2 className="h-3 w-3" />
                  {validCount} valid
                </Badge>
                {invalidCount > 0 && (
                  <Badge variant="destructive" className="gap-1">
                    <AlertTriangle className="h-3 w-3" />
                    {invalidCount} invalid
                  </Badge>
                )}
              </div>
              <div className="max-h-[200px] overflow-y-auto rounded border">
                <table className="w-full text-xs">
                  <thead className="sticky top-0 bg-muted/50">
                    <tr>
                      <th className="px-2 py-1 text-left">Line</th>
                      <th className="px-2 py-1 text-left">Base ID</th>
                      <th className="px-2 py-1 text-left">Credits</th>
                      <th className="px-2 py-1 text-left">Points</th>
                      <th className="px-2 py-1 text-left">Type</th>
                      <th className="px-2 py-1 text-left">Status</th>
                    </tr>
                  </thead>
                  <tbody>
                    {parsed.map((row) => (
                      <tr key={row.lineNumber} className={row.ok ? "" : "bg-destructive/10"}>
                        <td className="px-2 py-0.5 font-mono text-muted-foreground">{row.lineNumber}</td>
                        <td className="px-2 py-0.5 font-mono">{row.baseId ?? "—"}</td>
                        <td className="px-2 py-0.5 font-mono">{row.credits ?? "—"}</td>
                        <td className="px-2 py-0.5 font-mono">{row.points ?? "—"}</td>
                        <td className="px-2 py-0.5 font-mono">{row.pointsType ?? "—"}</td>
                        <td className="px-2 py-0.5">
                          {row.ok ? (
                            <span className="text-[var(--admin-success)]">OK</span>
                          ) : (
                            <span className="text-destructive">{row.error}</span>
                          )}
                        </td>
                      </tr>
                    ))}
                  </tbody>
                </table>
              </div>
            </div>
          )}

          <div className="flex justify-end gap-2">
            <Button variant="outline" onClick={() => setOpen(false)} disabled={importing}>
              Cancel
            </Button>
            <Button onClick={handleImport} disabled={importing || validCount === 0}>
              {importing ? (
                <Loader2 className="mr-2 h-4 w-4 animate-spin" />
              ) : (
                <Upload className="mr-2 h-4 w-4" />
              )}
              Import {validCount} item{validCount !== 1 ? "s" : ""}
            </Button>
          </div>
        </div>
      </DialogContent>
    </Dialog>
  );
}