import { useMemo, useState } from "react";
import { Save, User } from "lucide-react";
import { getDisplayFlagConfig } from "~/lib/avatar-data";
import type { AvatarData, FlagConfig, RawFlagConfig } from "~/lib/flag-types";
import { Button } from "~/components/ui/button";
import { FlagBuilder } from "~/components/ui/FlagBuilder";
import { FlagSvg } from "~/components/ui/FlagSvg";
import { AvatarUploader } from "~/components/ui/AvatarUploader";
import { cloudinaryAvatarUrl } from "~/lib/cloudinary-url";
import { cn } from "~/lib/utils";

interface AvatarEditorProps {
  id: string;
  flagConfig?: RawFlagConfig | null;
  uploadedPhotoUrl?: string | null;
  uploadUrl: string;
  isTeam?: boolean;
  currentAvatarType?: string | null;
  ownerAvatarData?: AvatarData | null;
  flagIntent?: string;
  removePhotoIntent?: string;
  useOwnerAvatarIntent?: string;
}

type Mode = "flag" | "upload" | "owner";

export function AvatarEditor({
  id,
  flagConfig,
  uploadedPhotoUrl,
  uploadUrl,
  isTeam = false,
  currentAvatarType,
  ownerAvatarData,
  flagIntent = "update-avatar-flag",
  removePhotoIntent = "remove-avatar-photo",
  useOwnerAvatarIntent = "use-owner-avatar",
}: AvatarEditorProps) {
  const initialFlag = useMemo(() => getDisplayFlagConfig(id, flagConfig), [flagConfig, id]);
  const [config, setConfig] = useState<FlagConfig>(initialFlag);

  const showOwnerTab = isTeam && ownerAvatarData !== null && ownerAvatarData !== undefined;
  const initialMode: Mode =
    currentAvatarType === "owner" && showOwnerTab ? "owner" :
    currentAvatarType === "uploaded" ? "upload" :
    "flag";
  const [mode, setMode] = useState<Mode>(initialMode);

  const tabs = [
    { key: "flag" as const, label: "Flag" },
    { key: "upload" as const, label: "Upload Photo" },
    ...(showOwnerTab ? [{ key: "owner" as const, label: "My Avatar" }] : []),
  ];

  return (
    <div className="space-y-4">
      <div className="flex overflow-hidden rounded-lg border border-border">
        {tabs.map((tab) => (
          <button
            key={tab.key}
            type="button"
            onClick={() => setMode(tab.key)}
            className={cn(
              "flex-1 py-2 text-sm font-medium transition-colors",
              mode === tab.key
                ? "bg-primary text-primary-foreground"
                : "text-muted-foreground hover:bg-accent"
            )}
          >
            {tab.label}
          </button>
        ))}
      </div>

      {mode === "flag" && (
        <form method="post" className="space-y-4">
          <input type="hidden" name="intent" value={flagIntent} />
          <input type="hidden" name="flagConfig" value={JSON.stringify(config)} />
          <FlagBuilder value={config} seed={id} onChange={setConfig} />
          <Button type="submit" className="w-full">
            <Save className="mr-2 h-4 w-4" />
            Save flag
          </Button>
        </form>
      )}

      {mode === "upload" && (
        <AvatarUploader
          uploadUrl={uploadUrl}
          teamId={isTeam ? id : undefined}
          savedPhotoUrl={uploadedPhotoUrl}
          removePhotoIntent={removePhotoIntent}
        />
      )}

      {mode === "owner" && ownerAvatarData && (
        <form method="post" className="space-y-4">
          <input type="hidden" name="intent" value={useOwnerAvatarIntent} />
          <div className="flex flex-col items-center gap-3 py-2">
            <OwnerAvatarPreview avatarData={ownerAvatarData} />
            <p className="text-sm text-muted-foreground">Your team will use your current profile avatar.</p>
          </div>
          <Button type="submit" className="w-full">
            <User className="mr-2 h-4 w-4" />
            Use my avatar
          </Button>
        </form>
      )}
    </div>
  );
}

function OwnerAvatarPreview({ avatarData }: { avatarData: AvatarData }) {
  if (avatarData.type === "image") {
    return (
      <img
        src={cloudinaryAvatarUrl(avatarData.url, 64)}
        alt="Your avatar"
        className="h-16 w-16 rounded-full object-cover ring-2 ring-border"
      />
    );
  }

  if (avatarData.type === "flag") {
    return (
      <FlagSvg
        config={avatarData.config}
        size={64}
        title="Your avatar"
        className="h-16 w-16 rounded-full ring-2 ring-border"
      />
    );
  }

  return null;
}
