import { useState } from "react";
import Checkbox from "@moduletrace/twui/form/Checkbox";
import Form from "@moduletrace/twui/form/Form";
import Input from "@moduletrace/twui/form/Input";
import Select from "@moduletrace/twui/form/Select";
import CodeEditor from "@/src/components/general/code-editor";
import HookPlaceFields from "@/src/components/general/hook-place-fields";
import {
    BotHookSignatureFormats,
    BotHookSources,
    type BotHookSignatureFormat,
    type BotHookSource,
} from "@/src/dict/bot-hook-dict";
import postAdminApi from "@/src/layouts/bots/(functions)/post-admin-api";
import AddFormActions from "@/src/layouts/bots/(partials)/add-form-actions";
import type {
    BotHookWithNames,
    BotHookWithToken,
    HookSessionChoice,
    NotifyWatchSync,
} from "@/src/types";

type Props = {
    /**
     * The hook to edit; left out to make one for `bot_id` there.
     */
    hook?: BotHookWithNames;
    bot_id: number;
    /**
     * Where a new hook runs at first (the conversation it's made from);
     * the form can pick another place, and another session there.
     */
    workspace_id?: number | null;
    /**
     * The bot's computers there, for a new browser-notification hook. Left
     * out (or empty), only URL hooks can be made.
     */
    computers?: { id?: number | ""; name?: string }[];
    onCancel: () => void;
    /**
     * `token` only for a new URL hook: its URL, shown once. `watch` for a
     * new notification hook: how setting up its computer went. `msg` is
     * what the save said.
     */
    onSaved: (params: {
        hook: BotHookWithNames;
        token?: string;
        watch?: NotifyWatchSync;
        msg?: string;
    }) => void;
};

/**
 * A hook's name and brief, where it runs (the bot's own chat or one of
 * its workspaces, and which session there), what calls it (its URL, or a computer's browser
 * notifications, chosen once when it's made), and then either whether its
 * calls must be signed (the secret, the header it comes in and how it's
 * written) or which notifications it takes. Makes a hook or edits one; a
 * saved secret is never shown again, so leaving it blank keeps it.
 */
export default function HookForm({
    hook,
    bot_id,
    workspace_id,
    computers = [],
    onCancel,
    onSaved,
}: Props) {
    const [source, setSource] = useState<BotHookSource>(
        (hook?.source as BotHookSource) || "url",
    );
    const [watch_computer_id, setWatchComputerId] = useState(
        hook?.watch_computer_id
            ? Number(hook.watch_computer_id)
            : Number(computers[0]?.id) || 0,
    );
    const [watch_filter, setWatchFilter] = useState(hook?.watch_filter || "");
    const [title, setTitle] = useState(hook?.title || "");
    const [instructions, setInstructions] = useState(hook?.instructions || "");
    const [signed, setSigned] = useState(Boolean(hook?.has_signing_secret));
    const [secret, setSecret] = useState("");
    const [header, setHeader] = useState(
        hook?.signature_header || "X-Hub-Signature-256",
    );
    const [format, setFormat] = useState<BotHookSignatureFormat>(
        (hook?.signature_format as BotHookSignatureFormat) || "sha256=hex",
    );
    const [place, setPlace] = useState<{
        workspace_id: number | null;
        session: HookSessionChoice;
    }>({
        workspace_id: hook
            ? Number(hook.workspace_id) || null
            : workspace_id || null,
        session: hook
            ? hook.session_id
                ? Number(hook.session_id)
                : "current"
            : "new",
    });
    const [loading, setLoading] = useState(false);
    const [error, setError] = useState<string>();

    const watching = source == "browser_notifications";

    const signing = (() => {
        if (watching) return {};
        if (!signed)
            return hook?.has_signing_secret ? { signing_secret: null } : {};

        return {
            ...(secret.trim() ? { signing_secret: secret } : {}),
            signature_header: header,
            signature_format: format,
        };
    })();

    const submit = async () => {
        if (loading) return;
        if (!window.confirm(`Save ${title || "this hook"}?`)) return;

        setLoading(true);
        setError(undefined);

        const res = hook
            ? await postAdminApi<BotHookWithNames>({
                  path: "hooks/update-hook",
                  body: {
                      hook_id: hook.id,
                      title,
                      instructions,
                      workspace_id: place.workspace_id,
                      session: place.session,
                      ...signing,
                      ...(watching ? { watch_filter } : {}),
                  },
              })
            : await postAdminApi<BotHookWithToken>({
                  path: "hooks/create-hook",
                  body: {
                      bot_id,
                      workspace_id: place.workspace_id,
                      session: place.session,
                      title,
                      instructions,
                      source,
                      ...signing,
                      ...(watching ? { watch_computer_id, watch_filter } : {}),
                  },
              });

        setLoading(false);

        if (!res.success || !res.singleRes) {
            setError(res.msg || "Couldn't save the hook.");
            return;
        }

        if ("hook" in res.singleRes) {
            onSaved({
                hook: res.singleRes.hook,
                token: res.singleRes.token,
                watch: res.singleRes.watch,
                msg: res.msg,
            });
        } else {
            onSaved({ hook: res.singleRes, msg: res.msg });
        }
    };

    return (
        <Form
            className="w-full gap-4! items-stretch pt-4 overflow-hidden px-1"
            onSubmit={submit}
        >
            <Input
                id="hook-title"
                title="Name"
                label="Name"
                showLabel
                autoComplete="off"
                placeholder="New GitHub issues"
                defaultValue={title}
                onChange={(e) => setTitle(e.target.value)}
            />
            <CodeEditor
                mode="markdown"
                className="h-40"
                title="Brief"
                content={instructions}
                info="What the bot does with each call. What the caller sends is added below this as data, never as instructions."
                onChange={(value) => setInstructions(value)}
            />
            <HookPlaceFields
                bot_id={bot_id}
                workspace_id={place.workspace_id}
                session={place.session}
                saved_session={
                    hook?.session_id
                        ? {
                              id: Number(hook.session_id),
                              title: hook.session_title,
                          }
                        : null
                }
                disabled={loading}
                onChange={setPlace}
            />
            {hook ? null : (
                <Select
                    id="hook-source"
                    title="What calls it"
                    label="What calls it"
                    showLabel
                    options={BotHookSources.filter(
                        (s) => s.value == "url" || computers.length,
                    ).map((s) => ({
                        value: s.value,
                        title: s.title,
                        default: s.value == source,
                    }))}
                    changeHandler={(value) =>
                        setSource(String(value) as BotHookSource)
                    }
                />
            )}
            {watching && !hook ? (
                <Select
                    id="hook-watch-computer"
                    title="Computer"
                    label="Computer"
                    showLabel
                    options={computers.map((c) => ({
                        value: String(c.id),
                        title: c.name || `Computer ${c.id}`,
                        default: Number(c.id) == watch_computer_id,
                    }))}
                    changeHandler={(value) => setWatchComputerId(Number(value))}
                />
            ) : null}
            {watching ? (
                <Input
                    id="hook-watch-filter"
                    title="Only notifications with"
                    label="Only notifications with"
                    showLabel
                    autoComplete="off"
                    placeholder="mail.google.com, invoice"
                    defaultValue={watch_filter}
                    info="Words in the site, title or text, comma-separated: any one is enough. Empty takes every notification. The site has to be allowed to send notifications in that computer's browser."
                    onChange={(e) => setWatchFilter(e.target.value)}
                />
            ) : null}
            {watching ? null : (
                <>
                    <Checkbox
                        title="Check signatures"
                        label="Only take calls signed with a secret (HMAC-SHA256 of the body, as GitHub and Stripe send)"
                        checked={signed}
                        changeHandler={setSigned}
                        labelProps={{
                            className: "w-full line-clamp-1 overflow-ellipsis",
                        }}
                    />
                    {signed ? (
                        <>
                            <Input
                                id="hook-secret"
                                title="Signing secret"
                                label="Signing secret"
                                showLabel
                                type="password"
                                autoComplete="new-password"
                                placeholder={
                                    hook?.has_signing_secret
                                        ? "Leave blank to keep the current secret"
                                        : ""
                                }
                                onChange={(e) => setSecret(e.target.value)}
                            />
                            <Input
                                id="hook-signature-header"
                                title="Signature header"
                                label="Signature header"
                                showLabel
                                autoComplete="off"
                                defaultValue={header}
                                onChange={(e) => setHeader(e.target.value)}
                            />
                            <Select
                                id="hook-signature-format"
                                title="Signature format"
                                label="Signature format"
                                showLabel
                                options={BotHookSignatureFormats.map((f) => ({
                                    value: f.value,
                                    title: f.title,
                                    default: f.value == format,
                                }))}
                                changeHandler={(value) =>
                                    setFormat(
                                        String(value) as BotHookSignatureFormat,
                                    )
                                }
                            />
                        </>
                    ) : null}
                </>
            )}
            <AddFormActions
                submit_label={hook ? "Save" : "Make hook"}
                loading={loading}
                error={error}
                onCancel={onCancel}
            />
        </Form>
    );
}