import {
  ActionIcon,
  Alert,
  Box,
  Button,
  Code,
  CopyButton,
  Divider,
  Group,
  Loader,
  Modal,
  Stack,
  Table,
  Text,
  TextInput,
  Tooltip,
} from "@mantine/core";
import { notifications } from "@mantine/notifications";
import { IconCopy, IconCheck, IconTrash } from "@tabler/icons-react";
import { useCallback, useEffect, useState } from "react";
import * as api from "../api";
import type { MCPToken, MCPTokenCreated } from "../api";
import { formatDateTimeShort } from "./format";

interface Props {
  opened: boolean;
  onClose: () => void;
}

export function MCPTokensModal({ opened, onClose }: Props) {
  const [tokens, setTokens] = useState<MCPToken[]>([]);
  const [loading, setLoading] = useState(false);
  const [newName, setNewName] = useState("");
  const [creating, setCreating] = useState(false);
  const [justCreated, setJustCreated] = useState<MCPTokenCreated | null>(null);

  const reload = useCallback(async () => {
    setLoading(true);
    try {
      setTokens(await api.listMCPTokens());
    } catch (e) {
      notifications.show({ color: "red", message: (e as Error).message });
    } finally {
      setLoading(false);
    }
  }, []);

  useEffect(() => {
    if (opened) {
      reload();
      setJustCreated(null);
      setNewName("");
    }
  }, [opened, reload]);

  const create = async () => {
    const name = newName.trim() || "default";
    setCreating(true);
    try {
      const t = await api.createMCPToken(name);
      setJustCreated(t);
      setNewName("");
      await reload();
    } catch (e) {
      notifications.show({ color: "red", message: (e as Error).message });
    } finally {
      setCreating(false);
    }
  };

  const revoke = async (id: string) => {
    if (!confirm("Revocar este token? Quien lo este usando dejara de tener acceso.")) return;
    try {
      await api.revokeMCPToken(id);
      await reload();
    } catch (e) {
      notifications.show({ color: "red", message: (e as Error).message });
    }
  };

  const mcpURL = `${window.location.origin}/mcp`;
  const claudeCmd = justCreated
    ? `claude mcp add kanban --transport http ${mcpURL} --header "Authorization: Bearer ${justCreated.token}"`
    : "";

  return (
    <Modal opened={opened} onClose={onClose} title="MCP Tokens" size="lg">
      <Stack gap="md">
        <Text size="sm" c="dimmed">
          Cada token deja conectar un cliente Claude al kanban como tu usuario.
          El valor solo aparece UNA vez al crearlo. Si lo pierdes, generas otro y revocas el antiguo.
        </Text>

        <Group align="end">
          <TextInput
            label="Nombre del token"
            placeholder="ej. portatil, sobremesa..."
            value={newName}
            onChange={(e) => setNewName(e.currentTarget.value)}
            style={{ flex: 1 }}
            disabled={creating}
          />
          <Button onClick={create} loading={creating}>
            Generar
          </Button>
        </Group>

        {justCreated && (
          <Alert color="yellow" title="Copia el token ahora — no se mostrara mas">
            <Stack gap="xs">
              <Group gap="xs" align="center">
                <Code style={{ flex: 1, wordBreak: "break-all" }}>{justCreated.token}</Code>
                <CopyButton value={justCreated.token}>
                  {({ copied, copy }) => (
                    <Tooltip label={copied ? "Copiado" : "Copiar token"}>
                      <ActionIcon variant="subtle" onClick={copy}>
                        {copied ? <IconCheck size={16} /> : <IconCopy size={16} />}
                      </ActionIcon>
                    </Tooltip>
                  )}
                </CopyButton>
              </Group>
              <Divider />
              <Text size="xs" c="dimmed">
                Pega este comando en tu PC para registrar el MCP en Claude Code:
              </Text>
              <Group gap="xs" align="center">
                <Code block style={{ flex: 1 }}>{claudeCmd}</Code>
                <CopyButton value={claudeCmd}>
                  {({ copied, copy }) => (
                    <Tooltip label={copied ? "Copiado" : "Copiar comando"}>
                      <ActionIcon variant="subtle" onClick={copy}>
                        {copied ? <IconCheck size={16} /> : <IconCopy size={16} />}
                      </ActionIcon>
                    </Tooltip>
                  )}
                </CopyButton>
              </Group>
            </Stack>
          </Alert>
        )}

        <Divider label="Tokens activos" labelPosition="left" />

        {loading ? (
          <Group justify="center" p="md">
            <Loader size="sm" />
          </Group>
        ) : tokens.length === 0 ? (
          <Text size="sm" c="dimmed" ta="center" py="md">
            Sin tokens. Genera uno arriba.
          </Text>
        ) : (
          <Table withTableBorder withColumnBorders verticalSpacing="xs" highlightOnHover>
            <Table.Thead>
              <Table.Tr>
                <Table.Th>Nombre</Table.Th>
                <Table.Th>Creado</Table.Th>
                <Table.Th>Ultimo uso</Table.Th>
                <Table.Th w={60} />
              </Table.Tr>
            </Table.Thead>
            <Table.Tbody>
              {tokens.map((t) => (
                <Table.Tr key={t.id}>
                  <Table.Td>{t.name}</Table.Td>
                  <Table.Td>{formatDateTimeShort(t.created_at)}</Table.Td>
                  <Table.Td>
                    {t.last_used_at ? formatDateTimeShort(t.last_used_at) : <Text c="dimmed">nunca</Text>}
                  </Table.Td>
                  <Table.Td>
                    <Tooltip label="Revocar">
                      <ActionIcon color="red" variant="subtle" onClick={() => revoke(t.id)}>
                        <IconTrash size={14} />
                      </ActionIcon>
                    </Tooltip>
                  </Table.Td>
                </Table.Tr>
              ))}
            </Table.Tbody>
          </Table>
        )}

        <Box>
          <Text size="xs" c="dimmed">
            Endpoint MCP: <Code>{mcpURL}</Code>
          </Text>
        </Box>
      </Stack>
    </Modal>
  );
}