"use client";

import { RiArrowRightLine as ArrowRight, RiCalendarCheckLine as CalendarPlus, RiCheckLine as Check, RiCloseLine as X } from "@remixicon/react";
import Link from "next/link";
import { useEffect, useRef, useState } from "react";
import { DAY_NAMES, mealLabel, slotKey, visibleMeals } from "@/app/lib/plan";
import { RECIPES_BY_ID } from "@/app/lib/recipes";
import { DEFAULT_STATE, sanitizeState } from "@/app/lib/sanitize";
import type { MealPlanState } from "@/app/types";
import { Button } from "@/components/base/buttons/button";

const STORAGE_KEY = "budget-meal-planner:v2";

function readPlan(): MealPlanState {
  try {
    const raw = window.localStorage.getItem(STORAGE_KEY);
    return raw ? sanitizeState(JSON.parse(raw)) : DEFAULT_STATE;
  } catch {
    return DEFAULT_STATE;
  }
}

export function AddToPlanControl({ recipeId, recipeTitle }: { recipeId: string; recipeTitle: string }) {
  const [open, setOpen] = useState(false);
  const [plan, setPlan] = useState<MealPlanState>(DEFAULT_STATE);
  const [addedLabel, setAddedLabel] = useState<string | null>(null);
  const dialogRef = useRef<HTMLDialogElement>(null);

  useEffect(() => {
    const dialog = dialogRef.current;
    if (!dialog) return;
    if (open && !dialog.open) dialog.showModal();
    if (!open && dialog.open) dialog.close();
    return () => {
      if (dialog.open) dialog.close();
    };
  }, [open]);

  function assignSlot(day: number, meal: number) {
    const latest = readPlan();
    const key = slotKey(day, meal);
    const updated: MealPlanState = {
      ...latest,
      slots: { ...latest.slots, [key]: recipeId },
    };
    try {
      window.localStorage.setItem(STORAGE_KEY, JSON.stringify(updated));
      setPlan(updated);
      setAddedLabel(`${DAY_NAMES[day]} · ${mealLabel(meal)}`);
      setOpen(false);
    } catch {
      // Blocked storage
    }
  }

  const meals = visibleMeals(plan.mealsPerDay);

  return (
    <div className="flex flex-wrap items-center gap-3">
      <Button
        leadingIcon={CalendarPlus}
        onClick={() => {
          setPlan(readPlan());
          setOpen(true);
        }}
      >
        Add to meal plan
      </Button>

      {addedLabel && (
        <span className="inline-flex flex-wrap items-center gap-2 rounded-lg border border-status-ok-line bg-status-ok-bg px-3 py-1.5 text-xs font-medium text-status-ok">
          <Check className="size-3.5 shrink-0" strokeWidth={2.5} aria-hidden />
          Added to {addedLabel}
          <Link href="/plan" className="ml-1 inline-flex items-center gap-1 font-semibold underline hover:opacity-85">
            Open planner
            <ArrowRight className="size-3" aria-hidden />
          </Link>
        </span>
      )}

      <dialog
        ref={dialogRef}
        onClose={() => setOpen(false)}
        onClick={(e) => e.target === dialogRef.current && setOpen(false)}
        aria-labelledby="add-to-plan-title"
        className="m-0 mt-auto max-h-[85dvh] w-full max-w-none overflow-y-auto rounded-t-3xl border border-line bg-surface p-0 text-ink shadow-2xl sm:m-auto sm:max-w-lg sm:rounded-3xl"
      >
        <div className="p-5 sm:p-6">
          <div className="flex items-start justify-between gap-4 border-b border-line pb-3">
            <div>
              <p className="font-mono text-xs tracking-wider text-ink-faint uppercase">Assign slot</p>
              <h2 id="add-to-plan-title" className="font-serif text-xl font-semibold">
                Add &ldquo;{recipeTitle}&rdquo;
              </h2>
            </div>
            <button
              type="button"
              onClick={() => setOpen(false)}
              aria-label="Close"
              className="grid size-10 shrink-0 place-items-center rounded-lg text-ink-muted hover:bg-raised hover:text-ink"
            >
              <X className="size-5" aria-hidden />
            </button>
          </div>

          <div className="mt-4 space-y-3">
            {Array.from({ length: plan.daysCount }, (_, day) => (
              <div key={day} className="rounded-lg border border-line bg-canvas p-3">
                <p className="font-serif text-sm font-semibold text-ink">{DAY_NAMES[day]}</p>
                <div className="mt-2 grid gap-2 sm:grid-cols-3">
                  {meals.map((meal) => {
                    const key = slotKey(day, meal);
                    const existingId = plan.slots[key];
                    const existingTitle = existingId ? RECIPES_BY_ID.get(existingId)?.title : null;
                    const isSame = existingId === recipeId;

                    return (
                      <button
                        key={key}
                        type="button"
                        onClick={() => assignSlot(day, meal)}
                        className={`min-h-12 rounded-lg border px-3 py-2 text-left text-xs transition-colors ${
                          isSame
                            ? "border-status-ok-line bg-status-ok-bg text-status-ok"
                            : "border-line-strong bg-surface hover:border-brand-600 hover:bg-brand-950"
                        }`}
                      >
                        <span className="block font-mono text-[10px] tracking-wider text-ink-faint uppercase">
                          {mealLabel(meal)}
                        </span>
                        <span className="mt-0.5 block truncate font-medium text-ink">
                          {existingTitle ? existingTitle : "+ Empty slot"}
                        </span>
                      </button>
                    );
                  })}
                </div>
              </div>
            ))}
          </div>
        </div>
      </dialog>
    </div>
  );
}