"use client";

import { AnimatePresence, motion } from "framer-motion";
import { useEffect, useState } from "react";

import { LOCALES, useI18n } from "@/lib/i18n";
import { cn } from "@/lib/utils";
import { openInstallSheet, useInstallAvailable } from "@/lib/install";
import { clearApiKey, saveSettings } from "@/lib/settings";
import { useHealth } from "@/lib/use-health";
import { AlertTriangleIcon, CheckCircleIcon, ChevronRightIcon, DownloadIcon, XCircleIcon } from "@/components/icons";
import { Button, Spinner } from "@/components/ui";

export function SettingsDialog({ open, onClose }: { open: boolean; onClose: () => void }) {
  const { health, loading, error, refresh, apiKey } = useHealth();
  const installAvailable = useInstallAvailable();
  const { locale, setLocale, t } = useI18n();
  const [keyDraft, setKeyDraft] = useState(apiKey);
  const [reveal, setReveal] = useState(false);
  const [saved, setSaved] = useState(false);

  useEffect(() => {
    if (!open) return;
    setKeyDraft(apiKey);
    setSaved(false);
    const onKey = (event: KeyboardEvent) => {
      if (event.key === "Escape") onClose();
    };
    window.addEventListener("keydown", onKey);
    return () => window.removeEventListener("keydown", onKey);
  }, [open, apiKey, onClose]);

  const save = () => {
    saveSettings({ apiKey: keyDraft.trim() });
    setSaved(true);
    window.setTimeout(() => setSaved(false), 2500);
  };

  const forget = () => {
    clearApiKey();
    setKeyDraft("");
  };

  const needsKeyMode = health?.authMode === "user-key";

  return (
    <AnimatePresence>
      {open ? (
        <motion.div
          className="fixed inset-0 z-50 flex items-end justify-center bg-frost-950/35 p-0 backdrop-blur-md sm:items-center sm:p-6"
          initial={{ opacity: 0 }}
          animate={{ opacity: 1 }}
          exit={{ opacity: 0 }}
          onClick={onClose}
        >
          <motion.div
            role="dialog"
            aria-modal="true"
            aria-labelledby="settings-title"
            initial={{ y: 48, opacity: 0 }}
            animate={{ y: 0, opacity: 1 }}
            exit={{ y: 32, opacity: 0 }}
            transition={{ type: "spring", stiffness: 340, damping: 32 }}
            onClick={(event) => event.stopPropagation()}
            className="glass-panel thin-scroll max-h-[90dvh] w-full max-w-lg overflow-y-auto rounded-t-[1.6rem] p-5 pb-safe shadow-2xl sm:rounded-[1.35rem] sm:pb-5"
          >
            <div className="sheet-grabber sm:hidden" aria-hidden />
            <div className="mb-4 flex items-start justify-between gap-4">
              <div>
                <h2 id="settings-title" className="text-lg font-semibold tracking-[-0.02em] text-frost-950 dark:text-frost-50">
                  {t("settings.title")}
                </h2>
                <p className="text-sm text-frost-600 dark:text-frost-300">
                  {t("settings.subtitle.before")}{" "}
                  <code className="rounded bg-frost-100 px-1 dark:bg-white/10">.env.local</code>{" "}
                  {t("settings.subtitle.after")}
                </p>
              </div>
              <Button variant="ghost" size="sm" onClick={onClose} aria-label={t("settings.close")}>
                ✕
              </Button>
            </div>

            {/* --------------------------------------------- language */}
            <section className="mb-4 space-y-2 rounded-2xl border border-[var(--hairline)] bg-[var(--surface-sunken)] p-3">
              <h3 className="text-sm font-semibold text-frost-950 dark:text-frost-50">
                {t("language.label")}
              </h3>
              <div className="segmented" role="group" aria-label={t("language.label")}>
                {LOCALES.map((entry) => (
                  <button
                    key={entry.id}
                    type="button"
                    aria-pressed={locale === entry.id}
                    onClick={() => setLocale(entry.id)}
                  >
                    {entry.label}
                  </button>
                ))}
              </div>
              <p className="text-[11px] leading-relaxed text-frost-500 dark:text-frost-400">
                {t("language.note")}
              </p>
            </section>

            {/* ------------------------------------------------ API key */}
            <section className="mb-4 space-y-2 rounded-2xl border border-[var(--hairline)] bg-[var(--surface-sunken)] p-3">
              <div className="flex items-center justify-between gap-2">
                <h3 className="text-sm font-semibold text-frost-950 dark:text-frost-50">{t("settings.apiKey")}</h3>
                {apiKey ? (
                  <span className="rounded-full bg-emerald-100 px-2 py-0.5 text-[11px] font-bold text-emerald-900 dark:bg-emerald-400/20 dark:text-emerald-200">
                    {t("settings.savedInBrowser")}
                  </span>
                ) : needsKeyMode ? (
                  <span className="rounded-full bg-amber-50 px-2 py-0.5 text-[11px] font-semibold text-amber-800 dark:bg-amber-500/15 dark:text-amber-200">
                    {t("settings.required")}
                  </span>
                ) : (
                  <span className="rounded-full bg-[var(--surface-sunken)] px-2 py-0.5 text-[11px] font-semibold text-frost-600 dark:text-frost-300">
                    {t("settings.notNeeded")}
                  </span>
                )}
              </div>

              <div className="flex flex-wrap items-center gap-2">
                <label className="sr-only" htmlFor="ollama-api-key">
                  {t("settings.apiKey")}
                </label>
                <input
                  id="ollama-api-key"
                  type={reveal ? "text" : "password"}
                  value={keyDraft}
                  onChange={(event) => setKeyDraft(event.target.value)}
                  onKeyDown={(event) => {
                    event.stopPropagation();
                    if (event.key === "Enter") save();
                  }}
                  placeholder={t("settings.pasteKey")}
                  autoComplete="off"
                  spellCheck={false}
                  className="min-w-40 flex-1 rounded-xl border border-[var(--hairline)] bg-[var(--surface-strong)] px-3 py-2 font-mono text-xs text-frost-950 outline-none transition placeholder:font-sans placeholder:text-frost-400 focus:border-accent-500 dark:text-frost-50"
                />
                <Button size="sm" variant="secondary" onClick={() => setReveal((value) => !value)}>
                  {reveal ? t("settings.hide") : t("settings.show")}
                </Button>
                <Button size="sm" onClick={save} disabled={keyDraft.trim() === apiKey}>
                  {t("common.save")}
                </Button>
              </div>

              <p className="text-[11px] leading-relaxed text-frost-500 dark:text-frost-400">
                {t("settings.keyNote")} <code>OLLAMA_AUTH=local</code> {t("settings.keyNoteAfter")}{" "}
                <code>.env.local</code> {t("settings.keyNoteEnd")} <code>ollama signin</code>
                {t("settings.keyNoteEnd2")}
              </p>

              <div className="flex flex-wrap items-center gap-2 pt-1">
                <Button size="sm" variant="secondary" onClick={() => void refresh()} loading={loading}>
                  {t("settings.testConnection")}
                </Button>
                {apiKey ? (
                  <Button size="sm" variant="ghost" onClick={forget}>
                    {t("settings.removeKey")}
                  </Button>
                ) : null}
                {saved ? (
                  <span className="text-xs font-semibold text-emerald-700 dark:text-emerald-300">
                    {t("settings.savedTesting")}
                  </span>
                ) : null}
              </div>
            </section>

            {/* ------------------------------------------------ install */}
            {installAvailable ? (
              <section className="mb-4 rounded-2xl border border-[var(--hairline)] bg-[var(--surface-sunken)] p-1.5">
                <button
                  type="button"
                  onClick={() => {
                    onClose();
                    openInstallSheet();
                  }}
                  className="flex w-full items-center gap-3 rounded-xl px-2.5 py-2 text-left transition hover:bg-[var(--hover)]"
                >
                  <span
                    aria-hidden
                    className="grid size-9 shrink-0 place-items-center rounded-xl border border-[var(--hairline)] bg-[var(--surface)] text-[var(--text-muted)]"
                  >
                    <DownloadIcon className="size-4" />
                  </span>
                  <span className="min-w-0 flex-1">
                    <span className="block text-sm font-semibold text-frost-950 dark:text-frost-50">
                      {t("settings.installApp")}
                    </span>
                    <span className="block text-[12px] text-[var(--text-subtle)]">
                      {t("settings.addToHome")}
                    </span>
                  </span>
                  <ChevronRightIcon className="size-4 shrink-0 text-[var(--text-subtle)]" />
                </button>
              </section>
            ) : null}

            {loading && !health ? (
              <div className="flex items-center gap-3 py-6 text-sm text-frost-600 dark:text-frost-300">
                <Spinner className="size-5" /> {t("settings.checking")}
              </div>
            ) : null}

            {error ? (
              <div className="rounded-2xl bg-rose-100 p-3 text-sm text-rose-900 dark:bg-rose-500/15 dark:text-rose-200">
                {error}
              </div>
            ) : null}

            {health ? <HealthPanel health={health} /> : null}
          </motion.div>
        </motion.div>
      ) : null}
    </AnimatePresence>
  );
}

function HealthPanel({ health }: { health: ReturnType<typeof useHealth>["health"] }) {
  const { t } = useI18n();
  if (!health) return null;
  const tone = health.ok ? "emerald" : health.needsKey ? "amber" : health.reachable ? "amber" : "rose";
  const toneClasses: Record<string, string> = {
    emerald: "bg-emerald-50 text-emerald-800 dark:bg-emerald-500/15 dark:text-emerald-200",
    amber: "bg-amber-50 text-amber-800 dark:bg-amber-500/15 dark:text-amber-200",
    rose: "bg-rose-50 text-rose-800 dark:bg-rose-500/15 dark:text-rose-200",
  };

  return (
    <div className="space-y-3">
      <div className={cn("flex items-start gap-2 rounded-2xl p-3 text-sm font-medium", toneClasses[tone])}>
        <span aria-hidden className="mt-0.5 shrink-0">
          {tone === "emerald" ? (
            <CheckCircleIcon className="size-5" />
          ) : tone === "amber" ? (
            <AlertTriangleIcon className="size-5" />
          ) : (
            <XCircleIcon className="size-5" />
          )}
        </span>
        <span>
          {health.ok
            ? t("health.ok")
            : health.needsKey
              ? t("health.needsKey")
              : health.keyAccepted === false
                ? t("health.rejected")
                : health.reachable
                  ? t("health.modelMissing")
                  : t("health.unreachable")}
          {health.error ? <p className="mt-1 font-normal">{health.error}</p> : null}
        </span>
      </div>

      <dl className="grid grid-cols-2 gap-2 text-sm">
        <Info
          label={t("health.auth")}
          value={
            health.authMode === "user-key"
              ? t("health.authUserKey")
              : health.authMode === "server"
                ? t("health.authServer")
                : t("health.authLocal")
          }
        />
        <Info label={t("health.endpoint")} value={health.baseUrl} mono />
        <Info
          label={t("health.mode")}
          value={health.mode === "direct-cloud" ? t("health.modeCloud") : t("health.modeLocal")}
        />
        <Info
          label={t("health.key")}
          value={
            health.needsKey
              ? t("health.keyMissing")
              : health.keyAccepted === true
                ? t("health.keyAccepted")
                : health.keyAccepted === false
                  ? t("health.keyRejected")
                  : health.authMode === "local"
                    ? t("health.keyNotNeeded")
                    : t("health.keyUnknown")
          }
        />
      </dl>

      <div className="space-y-2">
        <ModelRow title={t("health.visionModel")} model={health.vision} />
        <ModelRow title={t("health.textModel")} model={health.text} />
      </div>

      {health.mode === "direct-cloud" && health.needsKey ? (
        <p className="rounded-2xl bg-[var(--surface-sunken)] p-3 text-xs text-frost-700 dark:text-frost-200">
          {t("health.createKey.before")}{" "}
          <a className="font-semibold underline underline-offset-2" href="https://ollama.com/settings/keys" target="_blank" rel="noreferrer">
            ollama.com/settings/keys
          </a>{" "}
          {t("health.createKey.after")} <code>ollama signin</code> {t("health.createKey.end")}{" "}
          <code>OLLAMA_AUTH=local</code>.
        </p>
      ) : null}
    </div>
  );
}

function Info({ label, value, mono }: { label: string; value: string; mono?: boolean }) {
  return (
    <div className="rounded-2xl border border-[var(--hairline)] bg-[var(--surface-sunken)] p-3">
      <dt className="text-xs uppercase tracking-wide text-frost-500 dark:text-frost-400">{label}</dt>
      <dd className={cn("mt-0.5 truncate font-semibold", mono && "font-mono text-xs")}>{value}</dd>
    </div>
  );
}

function ModelRow({
  title,
  model,
}: {
  title: string;
  model: { configured: string; resolved: string; available: boolean | null; note?: string };
}) {
  const { t } = useI18n();
  const badge =
    model.available === true
      ? { text: t("health.available"), className: "bg-emerald-100 text-emerald-900 dark:bg-emerald-400/20 dark:text-emerald-200" }
      : model.available === false
        ? { text: t("health.notFound"), className: "bg-rose-50 text-rose-800 dark:bg-rose-500/15 dark:text-rose-200" }
        : { text: t("health.unknown"), className: "bg-[var(--surface-sunken)] text-frost-600 dark:text-frost-300" };

  return (
    <div className="rounded-2xl border border-[var(--hairline)] bg-[var(--surface-sunken)] p-3">
      <div className="flex items-center justify-between gap-2">
        <p className="text-xs uppercase tracking-wide text-frost-500 dark:text-frost-400">{title}</p>
        <span className={cn("rounded-full px-2 py-0.5 text-[11px] font-bold", badge.className)}>
          {badge.text}
        </span>
      </div>
      <p className="mt-1 font-mono text-sm font-semibold">{model.resolved}</p>
      {model.configured !== model.resolved ? (
        <p className="text-xs text-frost-500 dark:text-frost-400">{t("health.configuredAs", { model: model.configured })}</p>
      ) : null}
      {model.note ? <p className="mt-1 text-xs text-amber-700 dark:text-amber-300">{model.note}</p> : null}
    </div>
  );
}