/*
	GoToSocial
	Copyright (C) GoToSocial Authors admin@gotosocial.org
	SPDX-License-Identifier: AGPL-3.0-or-later

	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU Affero General Public License as published by
	the Free Software Foundation, either version 3 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU Affero General Public License for more details.

	You should have received a copy of the GNU Affero General Public License
	along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

import React from "react";

import FormWithData from "../lib/form/form-with-data";

import { useVerifyCredentialsQuery } from "../lib/query/oauth";
import { useArrayInput, useTextInput } from "../lib/form";
import { TextInput } from "../components/form/inputs";
import useFormSubmit from "../lib/form/submit";
import MutationButton from "../components/form/mutation-button";
import { useAliasAccountMutation, useMoveAccountMutation } from "../lib/query/user";
import { FormContext, useWithFormContext } from "../lib/form/context";
import { store } from "../redux/store";

export default function UserMigration() {
	return (
		<FormWithData
			dataQuery={useVerifyCredentialsQuery}
			DataForm={UserMigrationForm}
		/>
	);
}

function UserMigrationForm({ data: profile }) {
	let urlStr = store.getState().oauth.instanceUrl ?? "";
	let url = new URL(urlStr);

	return (
		<>
			<h2>Account Migration Settings</h2>
			<div className="info">
				<i className="fa fa-fw fa-exclamation-triangle" aria-hidden="true"></i>
				<b>Moving your account to another instance, or moving an account from another instance to your account, isn't implemented yet! You will only be able to use the "alias" section of the below panel. <a href="https://github.com/superseriousbusiness/gotosocial/issues/130" target="_blank" rel="noopener noreferrer">See here for progress</a>.</b>
			</div>
			<p>
				The following settings allow you to <strong>alias</strong> your account to another account
				elsewhere, and to <strong>move</strong> your followers and following lists to another account.
			</p>
			<p>
				Account <strong>aliasing</strong> is harmless and reversible; you can
				set and unset up to five account aliases as many times as you wish.
			</p>
			<p>
				The account <strong>move</strong> action, on the other hand, has serious and irreversible consequences.
			</p>
			<p>
				To move, you must set an alias from your account to the target account, using this settings panel.
			</p>
			<p>
				You must also set an alias from the target account back to your account, using
				the settings panel of the instance on which the target account resides.
			</p>
			<p>
				Provide the following details to the other instance: 
			</p>
			<dl className="migration-details">
				<div>
					<dt>Account handle/username:</dt>
					<dd>@{profile.acct}@{url.host}</dd>
				</div>
				<div>
					<dt>Account URI:</dt>
					<dd>{urlStr}/users/{profile.username}</dd>
				</div>
			</dl>
			<p>
				For more information on account migration, please see <a href="https://docs.gotosocial.org/en/latest/user_guide/settings/#alias-account" target="_blank" className="docslink" rel="noreferrer">the documentation</a>.
			</p>
			<AliasForm data={profile} />
			<MoveForm data={profile} />
		</>
	);
}

function AliasForm({ data: profile }) {
	const form = {
		alsoKnownAs: useArrayInput("also_known_as_uris", {
			source: profile,
			valueSelector: (p) => (
				p.source?.also_known_as_uris
					? p.source?.also_known_as_uris.map(entry => [entry])
					: []
			),
			length: 5,
		}),
	};

	const [submitForm, result] = useFormSubmit(form, useAliasAccountMutation());
	
	return (
		<form className="user-migration-alias" onSubmit={submitForm}>
			<div className="form-section-docs without-border">
				<h3>Alias Account</h3>
				<a
					href="https://docs.gotosocial.org/en/latest/user_guide/settings/#alias-account"
					target="_blank"
					className="docslink"
					rel="noreferrer"
				>
					Learn more about account aliasing (opens in a new tab)
				</a>
			</div>
			<AlsoKnownAsURIs
				field={form.alsoKnownAs}
			/>
			<MutationButton
				disabled={false}
				label="Save account aliases"
				result={result}
			/>
		</form>
	);
}

function AlsoKnownAsURIs({ field: formField }) {	
	return (
		<div className="aliases">
			<FormContext.Provider value={formField.ctx}>
				{formField.value.map((data, i) => (
					<AlsoKnownAsURI
						key={i}
						index={i}
						data={data}
					/>
				))}
			</FormContext.Provider>
		</div>
	);
}

function AlsoKnownAsURI({ index, data }) {	
	const name = `${index}`;
	const form = useWithFormContext(index, {
		alsoKnownAsURI: useTextInput(
			name,
			// Only one field per entry.
			{ defaultValue: data[0] ?? "" },
		),
	}); 

	return (
		<TextInput
			label={`Alias #${index+1}`}
			field={form.alsoKnownAsURI}
			placeholder={`https://example.org/users/my_other_account_${index+1}`}
		/>
	);
}

function MoveForm({ data: profile }) {
	const form = {
		movedToURI: useTextInput("moved_to_uri", {
			source: profile,
			valueSelector: (p) => p.moved?.uri },
		),
		password: useTextInput("password"),
	};

	const [submitForm, result] = useFormSubmit(form, useMoveAccountMutation());
	
	return (
		<form className="user-migration-move" onSubmit={submitForm}>
			<div className="form-section-docs without-border">
				<h3>Move Account</h3>
				<a
					href="https://docs.gotosocial.org/en/latest/user_guide/settings/#move-account"
					target="_blank"
					className="docslink"
					rel="noreferrer"
				>
					Learn more about moving your account (opens in a new tab)
				</a>
			</div>
			<TextInput
				disabled={true}
				field={form.movedToURI}
				label="Move target URI"
				placeholder="https://example.org/users/my_new_account"
			/>
			<TextInput
				disabled={true}
				type="password"
				name="password"
				field={form.password}
				label="Confirm account password"
			/>
			<MutationButton
				disabled={true}
				label="Confirm account move"
				result={result}
			/>
		</form>
	);
}