/**
 * Configure the UI that's used by the Code provider.
 *
 * ```ts {1,7-12}
 * import { CodeUI } from "@openauthjs/openauth/ui/code"
 * import { CodeProvider } from "@openauthjs/openauth/provider/code"
 *
 * export default issuer({
 *   providers: {
 *     code: CodeAdapter(
 *       CodeUI({
 *         copy: {
 *           code_info: "We'll send a pin code to your email"
 *         },
 *         sendCode: (claims, code) => console.log(claims.email, code)
 *       })
 *     )
 *   },
 *   // ...
 * })
 * ```
 *
 * @packageDocumentation
 */
/** @jsxImportSource hono/jsx */

import { UnknownStateError } from '../error.js';
import { CodeProviderOptions } from '../provider/code.js';
import { Layout } from './base.js';
import { FormAlert } from './form.js';

const DEFAULT_COPY = {
	/**
	 * Copy for the email input.
	 */
	email_placeholder: 'Email',
	/**
	 * Error message when the email is invalid.
	 */
	email_invalid: 'Email address is not valid',
	/**
	 * Copy for the continue button.
	 */
	button_continue: 'Continue',
	/**
	 * Copy informing that the pin code will be emailed.
	 */
	code_info: "We'll send a pin code to your email.",
	/**
	 * Copy for the pin code input.
	 */
	code_placeholder: 'Code',
	/**
	 * Error message when the code is invalid.
	 */
	code_invalid: 'Invalid code',
	/**
	 * Copy for when the code was sent.
	 */
	code_sent: 'Code sent to ',
	/**
	 * Copy for when the code was resent.
	 */
	code_resent: 'Code resent to ',
	/**
	 * Copy for the link to resend the code.
	 */
	code_didnt_get: "Didn't get code?",
	/**
	 * Copy for the resend button.
	 */
	code_resend: 'Resend',
	/**
	 * Error message when too many codes have been asked for, or too many
	 * guesses made. Deliberately one message for both: which of the two it was
	 * is a fact about somebody else's mailbox.
	 */
	rate_limited: 'Too many attempts. Wait a moment and start again.',
	/**
	 * The consent line under the action, split around its two links so the
	 * sentence stays one translatable run rather than being glued together
	 * from fragments in the markup.
	 */
	terms_before:
		'By continuing, you acknowledge that you have read and understood, and agree to Nestri\u2019s ',
	terms_label: 'Terms & Conditions',
	terms_url: 'https://nestri.io/terms',
	terms_between: ' and ',
	privacy_label: 'Privacy Policy',
	privacy_url: 'https://nestri.io/privacy',
	terms_after: '.'
};

export type CodeUICopy = typeof DEFAULT_COPY;

/**
 * Configure the password UI.
 */
export interface CodeUIOptions {
	/**
	 * Callback to send the pin code to the user.
	 *
	 * The `claims` object contains the email or phone number of the user. You can send the code
	 * using this.
	 *
	 * @example
	 * ```ts
	 * async (claims, code) => {
	 *   // Send the code via the claim
	 * }
	 * ```
	 */
	sendCode: (claims: Record<string, string>, code: string) => Promise<void>;
	/**
	 * Custom copy for the UI.
	 */
	copy?: Partial<CodeUICopy>;
	/**
	 * The mode to use for the input.
	 * @default "email"
	 */
	mode?: 'email' | 'phone';
}

/**
 * Creates a UI for the Code provider flow.
 * @param props - Configure the UI.
 */
export function CodeUI(props: CodeUIOptions): CodeProviderOptions {
	const copy = {
		...DEFAULT_COPY,
		...props.copy
	};

	const mode = props.mode ?? 'email';

	return {
		sendCode: props.sendCode,
		length: 6,
		request: async (_req, state, _form, error): Promise<Response> => {
			if (state.type === 'start') {
				const jsx = (
					<Layout>
						<form data-component="form" method="post">
							{error?.type === 'invalid_claim' && <FormAlert message={copy.email_invalid} />}
							{error?.type === 'rate_limit' && <FormAlert message={copy.rate_limited} />}
							<input type="hidden" name="action" value="request" />
							<input
								data-component="input"
								autofocus
								type={mode === 'email' ? 'email' : 'tel'}
								name={mode === 'email' ? 'email' : 'phone'}
								inputmode={mode === 'email' ? 'email' : 'numeric'}
								required
								placeholder={copy.email_placeholder}
							/>
							<button data-component="button">{copy.button_continue}</button>
						</form>
						<p data-component="form-footer">
							{copy.terms_before}
							<a href={copy.terms_url} rel="noopener noreferrer" target="_blank">
								{copy.terms_label}
							</a>
							{copy.terms_between}
							<a href={copy.privacy_url} rel="noopener noreferrer" target="_blank">
								{copy.privacy_label}
							</a>
							{copy.terms_after}
						</p>
					</Layout>
				);
				return new Response(jsx.toString(), {
					headers: {
						'Content-Type': 'text/html'
					}
				});
			}

			if (state.type === 'code') {
				const jsx = (
					<Layout>
						<form data-component="form" class="form" method="post">
							{error?.type === 'invalid_code' && <FormAlert message={copy.code_invalid} />}
							{error?.type === 'rate_limit' && <FormAlert message={copy.rate_limited} />}
							{state.type === 'code' && (
								<FormAlert
									message={(state.resend ? copy.code_resent : copy.code_sent) + state.claims.email}
									color="success"
								/>
							)}
							<input type="hidden" name="action" value="verify" />
							<input
								data-component="input"
								autofocus
								minLength={6}
								maxLength={6}
								type="text"
								name="code"
								required
								inputmode="numeric"
								autocomplete="one-time-code"
								placeholder={copy.code_placeholder}
							/>
							<button data-component="button">{copy.button_continue}</button>
						</form>
						<form method="post">
							{Object.entries(state.claims).map(([key, value]) => (
								<input key={key} type="hidden" name={key} value={value} className="hidden" />
							))}
							<input type="hidden" name="action" value="request" />
							<div data-component="form-footer">
								<span>
									{copy.code_didnt_get} <button data-component="link">{copy.code_resend}</button>
								</span>
							</div>
						</form>
					</Layout>
				);
				return new Response(jsx.toString(), {
					headers: {
						'Content-Type': 'text/html'
					}
				});
			}

			throw new UnknownStateError();
		}
	};
}