import { useState } from "react";
import { qk } from "../lib/queryKeys";
import { useTranslation } from "react-i18next";
import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
import { Lock, Pencil, Plus, Trash2 } from "lucide-react";
import Modal from "./ui/Modal";
import { useConfirm } from "./confirmContext";
import { api, type DownloadProfile, type DownloadSpec } from "../lib/api";
import { Button } from "./ui/Button";
import SegmentedToggle from "./ui/SegmentedToggle";
import FilterSelect from "./ui/FilterSelect";
import { IconButton } from "./ui/IconButton";
import { CheckRow } from "./ui/NativeControls";
import { Input } from "./ui/Input";
import { SURFACE } from "./ui/surfaces";
import { SectionLabel } from "./ui/Headings";

const HEIGHTS = [null, 2160, 1440, 1080, 720, 480, 360];

const BLANK: DownloadSpec = {
  mode: "av",
  max_height: 720,
  container: "mp4",
  audio_format: "m4a",
  vcodec: null,
  embed_subs: false,
  embed_chapters: true,
  embed_thumbnail: true,
  sponsorblock: false,
};

function Check({
  label,
  checked,
  onChange,
}: {
  label: string;
  checked: boolean;
  onChange: (v: boolean) => void;
}) {
  return (
    <CheckRow checked={checked} onChange={onChange} className="text-sm">
      {label}
    </CheckRow>
  );
}

export default function ProfileEditor({ onClose }: { onClose: () => void }) {
  const { t } = useTranslation();
  const qc = useQueryClient();
  const confirm = useConfirm();
  const profilesQ = useQuery({ queryKey: qk.downloadProfiles(), queryFn: api.downloadProfiles });
  const profiles = profilesQ.data ?? [];
  const builtins = profiles.filter((p) => p.is_builtin);
  const mine = profiles.filter((p) => !p.is_builtin);

  const [editing, setEditing] = useState<DownloadProfile | null>(null);
  const [name, setName] = useState("");
  const [spec, setSpec] = useState<DownloadSpec>(BLANK);
  const [formOpen, setFormOpen] = useState(false);

  const invalidate = () => qc.invalidateQueries({ queryKey: qk.downloadProfiles() });
  const startNew = () => {
    setEditing(null);
    setName("");
    setSpec(BLANK);
    setFormOpen(true);
  };
  const startEdit = (p: DownloadProfile) => {
    setEditing(p);
    setName(p.name);
    setSpec({ ...BLANK, ...p.spec });
    setFormOpen(true);
  };

  const save = useMutation({
    mutationFn: () =>
      editing
        ? api.updateDownloadProfile(editing.id, { name, spec })
        : api.createDownloadProfile({ name, spec }),
    onSuccess: () => {
      invalidate();
      setFormOpen(false);
    },
    meta: { failTitle: "errors.writeFailed.downloadProfileSave" },
  });
  const del = useMutation({
    mutationFn: (id: number) => api.deleteDownloadProfile(id),
    onSuccess: invalidate,
    meta: { failTitle: "errors.writeFailed.downloadProfileDelete" },
  });

  const onDelete = async (p: DownloadProfile) => {
    if (
      await confirm({
        title: t("downloads.profiles.delete"),
        message: t("downloads.profiles.deleteConfirm", { name: p.name }),
        confirmLabel: t("downloads.profiles.delete"),
        danger: true,
      })
    ) {
      del.mutate(p.id);
    }
  };

  const patch = (p: Partial<DownloadSpec>) => setSpec((s) => ({ ...s, ...p }));

  return (
    <Modal
      initialFocus="close"
      title={t("downloads.profiles.title")}
      onClose={onClose}
      maxWidth="max-w-xl"
    >
      {/* Existing formats */}
      <div className="space-y-1.5 mb-4">
        <SectionLabel level={3}>{t("downloads.profiles.builtin")}</SectionLabel>
        {builtins.map((p) => (
          <div key={p.id} className={`${SURFACE.card} flex items-center gap-2 text-sm px-3 py-1.5`}>
            <Lock className="w-3.5 h-3.5 text-muted shrink-0" />
            <span className="flex-1 truncate">{p.name}</span>
          </div>
        ))}
        {mine.length > 0 && (
          <SectionLabel level={3} className="pt-2">
            {t("downloads.profiles.yours")}
          </SectionLabel>
        )}
        {mine.map((p) => (
          <div key={p.id} className={`${SURFACE.card} flex items-center gap-2 text-sm px-3 py-1.5`}>
            <span className="flex-1 truncate">{p.name}</span>
            <IconButton onClick={() => startEdit(p)} label={t("downloads.actions.rename")}>
              <Pencil />
            </IconButton>
            <IconButton
              variant="danger"
              onClick={() => onDelete(p)}
              label={t("downloads.profiles.delete")}
            >
              <Trash2 />
            </IconButton>
          </div>
        ))}
      </div>

      {!formOpen ? (
        <Button variant="primary" size="sm" icon={<Plus className="w-4 h-4" />} onClick={startNew}>
          {t("downloads.profiles.new")}
        </Button>
      ) : (
        <div className="rounded-xl border border-border p-4 space-y-3">
          <div>
            <label className="block text-sm font-medium mb-1">{t("downloads.profiles.name")}</label>
            <Input
              className="w-full"
              value={name}
              onChange={(e) => setName(e.target.value)}
              placeholder={t("downloads.profiles.namePlaceholder")}
            />
          </div>
          {/* Mode on its own row: three worded choices need the width a half column lacks on a
              phone. Segmented for the short fixed sets, a menu for the seven heights (owner's pick). */}
          <div>
            <span className="block text-sm font-medium mb-1" aria-hidden="true">
              {t("downloads.profiles.mode")}
            </span>
            <SegmentedToggle
              ariaLabel={t("downloads.profiles.mode")}
              size="md"
              fullWidth
              value={spec.mode}
              onChange={(mode) => patch({ mode })}
              options={[
                { value: "av", label: t("downloads.profiles.modeAv") },
                { value: "v", label: t("downloads.profiles.modeV") },
                { value: "a", label: t("downloads.profiles.modeA") },
              ]}
            />
          </div>
          <div>
            {spec.mode !== "a" ? (
              <div>
                <span className="block text-sm font-medium mb-1" aria-hidden="true">
                  {t("downloads.profiles.quality")}
                </span>
                <FilterSelect
                  label={t("downloads.profiles.quality")}
                  hideLabel
                  selected={[String(spec.max_height ?? "")]}
                  onChange={([v]) => v !== undefined && patch({ max_height: v ? Number(v) : null })}
                  options={HEIGHTS.map((h) => ({
                    value: String(h ?? ""),
                    label: h ? `${h}p` : t("downloads.profiles.best"),
                  }))}
                />
              </div>
            ) : (
              <div>
                <span className="block text-sm font-medium mb-1" aria-hidden="true">
                  {t("downloads.profiles.audioFormat")}
                </span>
                {/* Only browser-playable audio: AAC (m4a) + MP3. Opus is dropped — Safari plays it
                    unreliably as a bare file, and the module's purpose is in-browser playback. */}
                <SegmentedToggle
                  ariaLabel={t("downloads.profiles.audioFormat")}
                  size="md"
                  value={spec.audio_format ?? "m4a"}
                  onChange={(audio_format) => patch({ audio_format })}
                  options={[
                    { value: "m4a", label: "M4A" },
                    { value: "mp3", label: "MP3" },
                  ]}
                />
              </div>
            )}
            {/* Container/codec are no longer user-selectable: every download is clamped to the
                mp4/H.264/AAC compat profile (the only universally browser-playable combo) so a
                shared link plays everywhere, iOS/Safari included. Enforced in backend `normalize`. */}
          </div>
          <div className="space-y-1.5 pt-1">
            {spec.mode !== "a" && (
              <Check
                label={t("downloads.profiles.embedSubs")}
                checked={spec.embed_subs}
                onChange={(v) => patch({ embed_subs: v })}
              />
            )}
            <Check
              label={t("downloads.profiles.embedChapters")}
              checked={spec.embed_chapters}
              onChange={(v) => patch({ embed_chapters: v })}
            />
            <Check
              label={t("downloads.profiles.embedThumbnail")}
              checked={spec.embed_thumbnail}
              onChange={(v) => patch({ embed_thumbnail: v })}
            />
            <Check
              label={t("downloads.profiles.sponsorblock")}
              checked={spec.sponsorblock}
              onChange={(v) => patch({ sponsorblock: v })}
            />
          </div>
          <div className="flex justify-end gap-2 pt-1">
            <Button variant="ghost" size="sm" onClick={() => setFormOpen(false)}>
              {t("downloads.actions.cancel")}
            </Button>
            <Button
              variant="primary"
              size="sm"
              onClick={() => save.mutate()}
              disabled={!name.trim() || save.isPending}
            >
              {editing ? t("downloads.profiles.save") : t("downloads.profiles.create")}
            </Button>
          </div>
        </div>
      )}
    </Modal>
  );
}