"use client";

import { useState } from "react";
import { useQuery, useMutation, useQueryClient } from "@tanstack/react-query";
import Link from "next/link";
import { api, Key } from "@/lib/api";
import { Badge, Button, Card, CardHeader, CardTitle } from "@/components/ui";
import { Table, Thead, Tbody, Tr, Th, Td } from "@/components/ui";

function UploadKeyModal({ onClose }: { onClose: () => void }) {
  const queryClient = useQueryClient();
  const [label, setLabel] = useState("");
  const [publicKey, setPublicKey] = useState("");

  const { mutate: upload, isPending, error } = useMutation({
    mutationFn: () => api.uploadKey(label.trim(), publicKey.trim()),
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: ["keys"] });
      onClose();
    },
  });

  return (
    <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/60 p-4 backdrop-blur-sm">
      <div className="w-full max-w-lg rounded-xl border border-border bg-surface p-6">
        <h2 className="mb-4 text-lg font-semibold text-text-primary">Upload SSH Key</h2>

        {error && (
          <div className="mb-4 rounded-lg border border-danger/30 bg-danger/10 px-3 py-2 text-sm text-danger">
            {(error as Error).message}
          </div>
        )}

        <div className="space-y-4">
          <div>
            <label className="mb-1.5 block text-sm font-medium text-text-secondary">
              Label
            </label>
            <input
              type="text"
              value={label}
              onChange={(e) => setLabel(e.target.value)}
              placeholder="e.g. dom-macbook"
              className="w-full rounded-lg border border-border bg-surface-2 px-3 py-2 text-sm text-text-primary placeholder-text-secondary/50 focus:border-accent focus:outline-none focus:ring-1 focus:ring-accent"
            />
          </div>
          <div>
            <label className="mb-1.5 block text-sm font-medium text-text-secondary">
              Public Key
            </label>
            <textarea
              value={publicKey}
              onChange={(e) => setPublicKey(e.target.value)}
              placeholder="ssh-ed25519 AAAA..."
              rows={4}
              className="w-full rounded-lg border border-border bg-surface-2 px-3 py-2 font-mono text-xs text-text-primary placeholder-text-secondary/50 focus:border-accent focus:outline-none focus:ring-1 focus:ring-accent resize-none"
            />
          </div>
        </div>

        <div className="mt-6 flex justify-end gap-3">
          <Button variant="ghost" onClick={onClose}>Cancel</Button>
          <Button
            variant="primary"
            loading={isPending}
            disabled={!label.trim() || !publicKey.trim()}
            onClick={() => upload()}
          >
            Upload Key
          </Button>
        </div>
      </div>
    </div>
  );
}

export default function KeysPage() {
  const [showUpload, setShowUpload] = useState(false);

  const { data: keys, isLoading, error } = useQuery({
    queryKey: ["keys"],
    queryFn: api.listKeys,
  });

  return (
    <div className="p-8">
      {showUpload && <UploadKeyModal onClose={() => setShowUpload(false)} />}

      <div className="mb-6 flex items-center justify-between">
        <div>
          <h1 className="text-2xl font-bold text-text-primary">SSH Keys</h1>
          <p className="mt-1 text-sm text-text-secondary">
            {keys?.length ?? 0} key{keys?.length !== 1 ? "s" : ""} managed
          </p>
        </div>
        <Button variant="primary" onClick={() => setShowUpload(true)}>
          <svg className="h-4 w-4" fill="none" viewBox="0 0 24 24" stroke="currentColor" strokeWidth={2}>
            <path strokeLinecap="round" strokeLinejoin="round" d="M3 16.5v2.25A2.25 2.25 0 005.25 21h13.5A2.25 2.25 0 0021 18.75V16.5m-13.5-9L12 3m0 0l4.5 4.5M12 3v13.5" />
          </svg>
          Upload Key
        </Button>
      </div>

      <Card padding={false}>
        {isLoading ? (
          <div className="flex items-center justify-center py-20">
            <div className="h-8 w-8 animate-spin rounded-full border-2 border-border border-t-accent" />
          </div>
        ) : error ? (
          <div className="py-20 text-center text-danger">
            Failed to load keys. Is the backend running?
          </div>
        ) : keys && keys.length > 0 ? (
          <Table>
            <Thead>
              <Tr>
                <Th>Label</Th>
                <Th>Fingerprint</Th>
                <Th>Source</Th>
                <Th>Assignments</Th>
                <Th>Created</Th>
                <Th />
              </Tr>
            </Thead>
            <Tbody>
              {keys.map((key: Key) => (
                <Tr key={key.key_id}>
                  <Td>
                    <span className="font-medium text-text-primary">{key.label}</span>
                  </Td>
                  <Td>
                    <span className="font-mono text-xs text-text-secondary">
                      {key.fingerprint}
                    </span>
                  </Td>
                  <Td>
                    <Badge variant={key.source === "generated" ? "accent" : "neutral"}>
                      {key.source}
                    </Badge>
                  </Td>
                  <Td>
                    <span className="text-text-secondary">
                      {key.assigned_count ?? 0} server{(key.assigned_count ?? 0) !== 1 ? "s" : ""}
                    </span>
                  </Td>
                  <Td>
                    <span className="text-text-secondary text-xs">
                      {new Date(key.created_at).toLocaleDateString()}
                    </span>
                  </Td>
                  <Td>
                    <Link href={`/keys/${key.key_id}`}>
                      <Button variant="ghost" size="sm">View →</Button>
                    </Link>
                  </Td>
                </Tr>
              ))}
            </Tbody>
          </Table>
        ) : (
          <div className="py-20 text-center">
            <div className="mx-auto mb-4 flex h-12 w-12 items-center justify-center rounded-full bg-surface-2">
              <svg className="h-6 w-6 text-text-secondary" fill="none" viewBox="0 0 24 24" stroke="currentColor" strokeWidth={1.5}>
                <path strokeLinecap="round" strokeLinejoin="round" d="M15.75 5.25a3 3 0 013 3m3 0a6 6 0 01-7.029 5.912c-.563-.097-1.159.026-1.563.43L10.5 17.25H8.25v2.25H6v2.25H2.25v-2.818c0-.597.237-1.17.659-1.591l6.499-6.499c.404-.404.527-1 .43-1.563A6 6 0 1121.75 8.25z" />
              </svg>
            </div>
            <p className="text-text-secondary">No SSH keys yet.</p>
            <Button
              variant="primary"
              size="sm"
              className="mt-4"
              onClick={() => setShowUpload(true)}
            >
              Upload your first key
            </Button>
          </div>
        )}
      </Card>
    </div>
  );
}
