import { useState } from "react";

import { Button, Field, inputClass } from "@/components/ui";
import { errorMessage } from "@/lib/api";
import { perPageOptions, ratingFilters, sortOptions } from "@/lib/browse";
import { cn } from "@/lib/cn";
import { applyPreferences, savePreferences } from "@/lib/preferences";
import type { UserPreferences } from "@/lib/types";
import { useAuth } from "@/store/auth";
import { toast } from "@/store/toasts";

const LANDING_OPTIONS: { value: NonNullable<UserPreferences["landing_page"]>; label: string }[] = [
  { value: "library", label: "Library" },
  { value: "online", label: "Online" },
  { value: "pools", label: "Pools" },
  { value: "followed", label: "Followed" },
];

export function PreferencesCard() {
  const user = useAuth((state) => state.user);
  const loadUser = useAuth((state) => state.loadUser);
  const [values, setValues] = useState<UserPreferences>({
    landing_page: user?.preferences?.landing_page ?? "library",
    ratings: user?.preferences?.ratings ?? [],
    ordering: user?.preferences?.ordering ?? "-created_at",
    per_page: user?.preferences?.per_page ?? 48,
    zoom: user?.preferences?.zoom ?? 190,
  });
  const [saving, setSaving] = useState(false);

  if (!user) return null;

  const ratings = values.ratings ?? [];

  function toggleRating(value: string) {
    const next = ratings.includes(value)
      ? ratings.filter((rating) => rating !== value)
      : [...ratings, value];
    setValues((current) => ({ ...current, ratings: next }));
  }

  async function handleSave() {
    setSaving(true);
    try {
      const saved = await savePreferences(values);
      applyPreferences(saved);
      await loadUser();
      toast.ok("Browsing preferences saved.");
    } catch (error) {
      toast.error(errorMessage(error));
    } finally {
      setSaving(false);
    }
  }

  return (
    <section className="rounded-lg border border-ctp-surface0 bg-ctp-base p-5">
      <h2 className="text-sm font-semibold text-ctp-subtext1">
        Browsing preferences
      </h2>
      <p className="mt-1 text-xs text-ctp-overlay0">
        Saved to your account, so they follow you to any browser. Changing the
        filters while browsing updates them as well.
      </p>

      <div className="mt-4 flex flex-col gap-4">
        <Field label="Landing page">
          <select
            className={inputClass}
            value={values.landing_page}
            onChange={(event) =>
              setValues((current) => ({
                ...current,
                landing_page: event.target
                  .value as UserPreferences["landing_page"],
              }))
            }
          >
            {LANDING_OPTIONS.map((option) => (
              <option key={option.value} value={option.value}>
                {option.label}
              </option>
            ))}
          </select>
        </Field>

        <div className="flex flex-col gap-1.5">
          <span className="text-xs font-medium uppercase tracking-wide text-ctp-overlay1">
            Default rating filter
          </span>
          <div className="flex flex-wrap gap-1.5">
            {ratingFilters.map((option) => (
              <button
                key={option.value}
                type="button"
                onClick={() => toggleRating(option.value)}
                className={cn(
                  "rounded-full border px-2.5 py-1 text-xs font-medium transition",
                  ratings.includes(option.value)
                    ? option.active
                    : "border-ctp-surface1 text-ctp-subtext0 hover:border-ctp-surface2 hover:text-ctp-text",
                )}
              >
                {option.label}
              </button>
            ))}
          </div>
          <p className="text-[11px] text-ctp-overlay0">
            No selection shows every rating.
          </p>
        </div>

        <div className="grid gap-4 sm:grid-cols-2">
          <Field label="Default sort">
            <select
              className={inputClass}
              value={values.ordering}
              onChange={(event) =>
                setValues((current) => ({
                  ...current,
                  ordering: event.target.value,
                }))
              }
            >
              {sortOptions.map((option) => (
                <option key={option.value} value={option.value}>
                  {option.label}
                </option>
              ))}
            </select>
          </Field>

          <Field label="Items per page">
            <select
              className={inputClass}
              value={values.per_page}
              onChange={(event) =>
                setValues((current) => ({
                  ...current,
                  per_page: Number(event.target.value),
                }))
              }
            >
              {perPageOptions.map((option) => (
                <option key={option} value={option}>
                  {option}
                </option>
              ))}
            </select>
          </Field>
        </div>

        <label className="flex flex-col gap-1.5">
          <span className="text-xs font-medium uppercase tracking-wide text-ctp-overlay1">
            Thumbnail size
          </span>
          <input
            type="range"
            min={140}
            max={320}
            step={10}
            value={values.zoom}
            onChange={(event) =>
              setValues((current) => ({
                ...current,
                zoom: Number(event.target.value),
              }))
            }
            className="accent-ctp-mauve"
          />
        </label>

        <label className="flex items-start gap-2 text-sm text-ctp-subtext0">
          <input
            type="checkbox"
            checked={values.online_hot_default ?? true}
            onChange={(event) =>
              setValues((current) => ({
                ...current,
                online_hot_default: event.target.checked,
              }))
            }
            className="mt-0.5 accent-ctp-mauve"
          />
          <span>
            Online starts with{" "}
            <span className="font-mono text-ctp-blue">order:hot</span>
            <span className="mt-0.5 block text-[11px] leading-relaxed text-ctp-overlay0">
              Used when you open Online without a search. With it off, Online
              opens on the site-wide newest posts.
            </span>
          </span>
        </label>

        <div>
          <Button onClick={() => void handleSave()} disabled={saving}>
            {saving ? "Saving…" : "Save preferences"}
          </Button>
        </div>
      </div>
    </section>
  );
}