"use client";

import { useState, useEffect } from "react";
import { useSession } from "next-auth/react";
import { useRouter } from "next/navigation";

interface SaveJobButtonProps {
  jobId: string;
  initialIsSaved?: boolean;
  className?: string;
  variant?: "icon" | "button" | "small";
  onSavedChange?: (isSaved: boolean) => void;
}

export function SaveJobButton({
  jobId,
  initialIsSaved,
  className = "",
  variant = "button",
  onSavedChange,
}: SaveJobButtonProps) {
  const { data: session } = useSession();
  const router = useRouter();
  const [isSaved, setIsSaved] = useState<boolean>(initialIsSaved ?? false);
  const [loading, setLoading] = useState<boolean>(false);

  useEffect(() => {
    if (initialIsSaved === undefined && session?.user) {
      // Fetch initial save state if not provided explicitly
      fetch(`/api/saved-jobs/${jobId}`)
        .then((res) => res.json())
        .then((data) => {
          if (data && typeof data.isSaved === "boolean") {
            setIsSaved(data.isSaved);
          }
        })
        .catch(() => {});
    }
  }, [jobId, session, initialIsSaved]);

  const toggleSave = async (e: React.MouseEvent) => {
    e.preventDefault();
    e.stopPropagation();

    if (!session?.user) {
      router.push("/login");
      return;
    }

    setLoading(true);

    try {
      if (isSaved) {
        // Unsave job
        const res = await fetch(`/api/saved-jobs/${jobId}`, {
          method: "DELETE",
        });
        if (res.ok) {
          setIsSaved(false);
          if (onSavedChange) onSavedChange(false);
        }
      } else {
        // Save job
        const res = await fetch("/api/saved-jobs", {
          method: "POST",
          headers: { "Content-Type": "application/json" },
          body: JSON.stringify({ jobId }),
        });
        if (res.ok) {
          setIsSaved(true);
          if (onSavedChange) onSavedChange(true);
        }
      }
    } catch (err) {
      console.error("Failed to toggle save status:", err);
    } finally {
      setLoading(false);
    }
  };

  if (variant === "icon") {
    return (
      <button
        onClick={toggleSave}
        disabled={loading}
        title={isSaved ? "Unsave job" : "Save job"}
        className={`p-2 rounded-full transition-colors ${
          isSaved
            ? "text-yellow-500 bg-yellow-50 hover:bg-yellow-100"
            : "text-zinc-400 hover:text-zinc-600 hover:bg-zinc-100"
        } ${className}`}
      >
        <svg
          xmlns="http://www.w3.org/2000/svg"
          viewBox="0 0 24 24"
          fill={isSaved ? "currentColor" : "none"}
          stroke="currentColor"
          strokeWidth="2"
          strokeLinecap="round"
          strokeLinejoin="round"
          className="w-5 h-5"
        >
          <path d="m19 21-7-4-7 4V5a2 2 0 0 1 2-2h10a2 2 0 0 1 2 2v16z" />
        </svg>
      </button>
    );
  }

  if (variant === "small") {
    return (
      <button
        onClick={toggleSave}
        disabled={loading}
        className={`inline-flex items-center space-x-1 px-2.5 py-1 text-xs font-medium rounded border transition-colors ${
          isSaved
            ? "bg-yellow-50 text-yellow-700 border-yellow-300 hover:bg-yellow-100"
            : "bg-white text-zinc-700 border-zinc-300 hover:bg-zinc-50"
        } ${className}`}
      >
        <svg
          xmlns="http://www.w3.org/2000/svg"
          viewBox="0 0 24 24"
          fill={isSaved ? "currentColor" : "none"}
          stroke="currentColor"
          strokeWidth="2"
          className="w-3.5 h-3.5"
        >
          <path d="m19 21-7-4-7 4V5a2 2 0 0 1 2-2h10a2 2 0 0 1 2 2v16z" />
        </svg>
        <span>{isSaved ? "Saved" : "Save"}</span>
      </button>
    );
  }

  return (
    <button
      onClick={toggleSave}
      disabled={loading}
      className={`inline-flex items-center space-x-2 px-4 py-2 text-sm font-medium rounded-md border shadow-sm transition-colors ${
        isSaved
          ? "bg-yellow-50 text-yellow-800 border-yellow-300 hover:bg-yellow-100"
          : "bg-white text-zinc-700 border-zinc-300 hover:bg-zinc-50"
      } ${className}`}
    >
      <svg
        xmlns="http://www.w3.org/2000/svg"
        viewBox="0 0 24 24"
        fill={isSaved ? "currentColor" : "none"}
        stroke="currentColor"
        strokeWidth="2"
        strokeLinecap="round"
        strokeLinejoin="round"
        className="w-4 h-4"
      >
        <path d="m19 21-7-4-7 4V5a2 2 0 0 1 2-2h10a2 2 0 0 1 2 2v16z" />
      </svg>
      <span>{isSaved ? "Saved to Bookmarks" : "Save Job"}</span>
    </button>
  );
}