"use client";

import { useState } from "react";
import { Bomb, Loader2 } from "lucide-react";
import { useRouter } from "next/navigation";
import { Button } from "@/components/ui/button";
import { Checkbox } from "@/components/ui/checkbox";
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
  DialogTrigger,
} from "@/components/ui/dialog";
import { Input } from "@/components/ui/input";
import { cn } from "@/lib/utils";
import { createMinefield } from "@/app/(frontend)/minigames/eod/custom/actions";

const MIN_SIZE = 9;
const MAX_SIZE = 500;
const PAINTER_MAX_CELLS = 2500;

export function CreateMinefieldDialog({
  unlocked,
  children,
}: {
  unlocked: boolean;
  children?: React.ReactNode;
}) {
  const router = useRouter();
  const [open, setOpen] = useState(false);
  const [name, setName] = useState("");
  const [rows, setRows] = useState(9);
  const [cols, setCols] = useState(9);
  const [mines, setMines] = useState<Set<number>>(new Set());
  const [exposeEdgeMines, setExposeEdgeMines] = useState(true);
  const [error, setError] = useState<string | null>(null);
  const [submitting, setSubmitting] = useState(false);

  const paintable = rows * cols <= PAINTER_MAX_CELLS;
  const mineCount = mines.size;

  const clampSize = (value: number) =>
    Math.max(MIN_SIZE, Math.min(MAX_SIZE, Number.isFinite(value) ? value : MIN_SIZE));

  const resetPainting = (nextRows: number, nextCols: number) => {
    const next = new Set<number>();
    for (const key of mines) {
      const row = Math.floor(key / cols);
      const col = key % cols;
      if (row < nextRows && col < nextCols) next.add(row * nextCols + col);
    }
    setMines(next);
  };

  const toggleCell = (index: number) => {
    setMines((current) => {
      const next = new Set(current);
      if (next.has(index)) next.delete(index);
      else next.add(index);
      return next;
    });
  };

  const submit = async () => {
    setError(null);
    const trimmed = name.trim();
    if (trimmed.length < 1 || trimmed.length > 100) {
      setError("Name must be 1-100 characters.");
      return;
    }
    if (mineCount < 1) {
      setError("Paint at least one mine.");
      return;
    }
    setSubmitting(true);
    const positions = Array.from(mines).map((key) => ({
      row: Math.floor(key / cols),
      col: key % cols,
    }));
    const result = await createMinefield({
      name: trimmed,
      rows,
      cols,
      mines: positions,
      exposeEdgeMines,
    });
    setSubmitting(false);
    if (result.success) {
      setOpen(false);
      setName("");
      setMines(new Set());
      router.refresh();
    } else {
      setError(result.error ?? "Could not publish the minefield.");
    }
  };

  if (!unlocked) return null;

  return (
    <Dialog
      open={open}
      onOpenChange={(next) => {
        setOpen(next);
        if (!next) setError(null);
      }}
    >
      <DialogTrigger asChild>
        {children ?? (
          <Button type="button">
            <Bomb /> Author minefield
          </Button>
        )}
      </DialogTrigger>
      <DialogContent className="max-h-[85dvh] overflow-auto sm:max-w-2xl">
        <DialogHeader>
          <DialogTitle>Author a custom minefield</DialogTitle>
          <DialogDescription>
            Pick a grid size, then paint charges. Published fields are instantly playable by every
            operator. No safe first click is guaranteed.
          </DialogDescription>
        </DialogHeader>

        <div className="flex flex-col gap-4">
          <div className="flex flex-wrap items-end gap-3">
            <div className="flex flex-col gap-1">
              <label htmlFor="minefield-name" className="text-xs font-medium">
                Name
              </label>
              <Input
                id="minefield-name"
                value={name}
                maxLength={100}
                onChange={(event) => setName(event.target.value)}
                placeholder="Sector Ghost"
                className="w-48"
              />
            </div>
            <div className="flex flex-col gap-1">
              <label htmlFor="minefield-rows" className="text-xs font-medium">
                Rows
              </label>
              <Input
                id="minefield-rows"
                type="number"
                min={MIN_SIZE}
                max={MAX_SIZE}
                value={rows}
                onChange={(event) => {
                  const next = clampSize(Number(event.target.value));
                  setRows(next);
                  resetPainting(next, cols);
                }}
                className="w-24"
              />
            </div>
            <div className="flex flex-col gap-1">
              <label htmlFor="minefield-cols" className="text-xs font-medium">
                Columns
              </label>
              <Input
                id="minefield-cols"
                type="number"
                min={MIN_SIZE}
                max={MAX_SIZE}
                value={cols}
                onChange={(event) => {
                  const next = clampSize(Number(event.target.value));
                  setCols(next);
                  resetPainting(rows, next);
                }}
                className="w-24"
              />
            </div>
            <span className="flex items-center gap-1.5 pb-2 text-sm font-medium tabular-nums">
              <Bomb className="size-4 text-amber-400" />
              {mineCount} mines
            </span>
          </div>

          {paintable ? (
            <div
              className="grid max-h-[45dvh] min-w-max gap-0.5 overflow-auto rounded-lg border border-border bg-background p-2"
              style={{ gridTemplateColumns: `repeat(${cols}, minmax(0, 1.25rem))` }}
              role="grid"
              aria-label="Mine painter"
            >
              {Array.from({ length: rows * cols }, (_, index) => {
                const painted = mines.has(index);
                return (
                  <button
                    key={index}
                    type="button"
                    role="gridcell"
                    aria-label={`row ${Math.floor(index / cols) + 1} col ${(index % cols) + 1}${painted ? " mine" : ""}`}
                    className={cn(
                      "flex size-5 items-center justify-center rounded-sm border transition-colors",
                      painted
                        ? "border-destructive bg-destructive text-destructive-foreground"
                        : "border-emerald-700/60 bg-emerald-900/40 hover:border-emerald-400 hover:bg-emerald-700",
                    )}
                    onClick={() => toggleCell(index)}
                  >
                    {painted ? <Bomb className="size-3" /> : null}
                  </button>
                );
              })}
            </div>
          ) : (
            <p className="rounded-lg border border-amber-500/40 bg-amber-500/10 p-3 text-xs text-amber-200">
              Painting supports grids up to {Math.sqrt(PAINTER_MAX_CELLS)}×
              {Math.sqrt(PAINTER_MAX_CELLS)} cells. Shrink the grid to author charges.
            </p>
          )}

          <div className="flex items-start gap-2 rounded-lg border border-border p-3">
            <Checkbox
              id="expose-edge-mines"
              checked={exposeEdgeMines}
              onCheckedChange={(value) => setExposeEdgeMines(value === true)}
              className="mt-0.5"
            />
            <div className="flex flex-col gap-0.5">
              <label htmlFor="expose-edge-mines" className="text-sm font-medium leading-none">
                Reveal bordering charges on failed runs
              </label>
              <p className="text-xs text-muted-foreground">
                Failed runs show mines that touch the swept area. Turn off to reveal none of the
                remaining charges.
              </p>
            </div>
          </div>

          {error && <p className="text-sm text-destructive">{error}</p>}
        </div>

        <DialogFooter>
          <Button type="button" variant="outline" onClick={() => setOpen(false)}>
            Cancel
          </Button>
          <Button type="button" disabled={submitting || !paintable} onClick={submit}>
            {submitting ? <Loader2 className="animate-spin" /> : <Bomb />}
            Publish minefield
          </Button>
        </DialogFooter>
      </DialogContent>
    </Dialog>
  );
}