/** @jsx h */
import { Component, ComponentChildren, createRef, h } from "https://esm.sh/preact@10.17.1";
import { tw } from "https://esm.sh/twind@0.16.16";
import { Editor, EditorEvent, EditorModel } from "./editor.tsx";

import { Avatar } from "./components/avatar.tsx";
import { IconButtonClass } from "./components/tw.ts";
import { Channel, sleep } from "https://raw.githubusercontent.com/BlowaterNostr/csp/master/csp.ts";
import { emitFunc } from "../event-bus.ts";

import { ChatMessage, groupContinuousMessages, parseContent, sortMessage, urlIsImage } from "./message.ts";
import { PublicKey } from "../lib/nostr-ts/key.ts";
import { NostrEvent, NostrKind } from "../lib/nostr-ts/nostr.ts";
import { Parsed_Event, PinConversation, UnpinConversation } from "../nostr.ts";
import { ProfileData, ProfileSyncer } from "../features/profile.ts";

import { UserDetail } from "./user-detail.tsx";

import { LinkColor, PrimaryTextColor } from "./style/colors.ts";
import { EventSyncer } from "./event_syncer.ts";
import { ButtonGroup } from "./components/button-group.tsx";
import { ProfileCard } from "./profile-card.tsx";
import { NoteCard } from "./note-card.tsx";
import { ProfileGetter } from "./search.tsx";
import { InviteCard } from "./invite-card.tsx";
import { SelectConversation } from "./search_model.ts";
import { AboutIcon } from "./icons/about-icon.tsx";
import { CloseIcon } from "./icons/close-icon.tsx";
import { LeftArrowIcon } from "./icons/left-arrow-icon.tsx";
import { NoteID } from "../lib/nostr-ts/nip19.ts";
import { ChatMessagesGetter } from "./app_update.tsx";

export type RightPanelModel = {
    show: boolean;
};

export type DirectMessagePanelUpdate =
    | {
        type: "ToggleRightPanel";
        show: boolean;
    }
    | ViewThread
    | ViewUserDetail
    | ViewNoteThread
    | {
        type: "ViewEventDetail";
        message: ChatMessage;
    };

export type ViewNoteThread = {
    type: "ViewNoteThread";
    event: NostrEvent;
};

export type ViewThread = {
    type: "ViewThread";
    root: NostrEvent;
};

export type ViewUserDetail = {
    type: "ViewUserDetail";
    pubkey: PublicKey;
};

interface DirectMessagePanelProps {
    myPublicKey: PublicKey;

    isGroupMessage: boolean;
    editorModel: EditorModel;

    focusedContent: {
        type: "ProfileData";
        data?: ProfileData;
        pubkey: PublicKey;
    } | undefined;

    rightPanelModel: RightPanelModel;

    emit: emitFunc<
        EditorEvent | DirectMessagePanelUpdate | PinConversation | UnpinConversation | SelectConversation
    >;
    profilesSyncer: ProfileSyncer;
    eventSyncer: EventSyncer;
    profileGetter: ProfileGetter;
    newMessageListener: NewMessageListener;
    messageGetter: ChatMessagesGetter;
}

export type NewMessageListener = {
    onChange(): Channel<ChatMessage>;
};

export class MessagePanel extends Component<DirectMessagePanelProps> {
    async componentDidMount() {
        const changes = this.props.newMessageListener.onChange();
        for (;;) {
            await sleep(333);
            await changes.ready();
            for (;;) {
                if (changes.isReadyToPop()) {
                    await changes.pop();
                    continue;
                }
                break;
            }
            this.setState({});
        }
    }

    render() {
        const props = this.props;

        let rightPanel;
        if (props.rightPanelModel.show) {
            let rightPanelChildren: h.JSX.Element | undefined;
            if (props.focusedContent) {
                if (props.focusedContent.type == "ProfileData") {
                    rightPanelChildren = (
                        <UserDetail
                            targetUserProfile={{
                                name: props.focusedContent?.data?.name,
                                picture: props.focusedContent?.data?.picture,
                                about: props.focusedContent?.data?.about,
                                website: props.focusedContent?.data?.website,
                            }}
                            pubkey={props.focusedContent.pubkey}
                            emit={props.emit}
                        />
                    );
                }
            }
            rightPanel = (
                <RightPanel
                    emit={props.emit}
                    rightPanelModel={props.rightPanelModel}
                >
                    {rightPanelChildren}
                </RightPanel>
            );
        }
        let vnode = (
            <div class={tw`flex h-full w-full relative bg-[#36393F]`}>
                <div class={tw`flex flex-col h-full flex-1 overflow-hidden`}>
                    <div class={tw`flex-1`}></div>

                    <MessageList
                        myPublicKey={props.myPublicKey}
                        messages={props.messageGetter.getChatMessages(props.editorModel.pubkey.hex)}
                        emit={props.emit}
                        profilesSyncer={props.profilesSyncer}
                        eventSyncer={props.eventSyncer}
                        profileGetter={props.profileGetter}
                    />

                    <Editor
                        maxHeight="30vh"
                        emit={props.emit}
                        isGroupChat={props.isGroupMessage}
                        targetNpub={props.editorModel.pubkey}
                        text={props.editorModel.text}
                        files={props.editorModel.files}
                        placeholder=""
                    />
                </div>
                {!props.rightPanelModel.show
                    ? (
                        <button
                            class={tw`absolute z-10 w-6 h-6 transition-transform duration-100 ease-in-out right-4 mobile:right-0 top-4${
                                props.rightPanelModel.show ? " rotate-180" : ""
                            } ${IconButtonClass}`}
                            onClick={() => {
                                props.emit({
                                    type: "ToggleRightPanel",
                                    show: !props.rightPanelModel.show,
                                });
                            }}
                        >
                            <LeftArrowIcon
                                class={tw`w-4 h-4`}
                                style={{
                                    fill: "#F3F4EA",
                                }}
                            />
                        </button>
                    )
                    : undefined}
                {rightPanel}
            </div>
        );
        return vnode;
    }
}
interface MessageListProps {
    myPublicKey: PublicKey;
    messages: ChatMessage[];
    emit: emitFunc<DirectMessagePanelUpdate | SelectConversation>;
    profilesSyncer: ProfileSyncer;
    eventSyncer: EventSyncer;
    profileGetter: ProfileGetter;
}

interface MessageListState {
    currentRenderCount: number;
}

const ItemsOfPerPage = 100;
export class MessageList extends Component<MessageListProps, MessageListState> {
    constructor(public props: MessageListProps) {
        super();
    }
    messagesULElement = createRef<HTMLUListElement>();
    state = {
        currentRenderCount: ItemsOfPerPage,
    };
    jitter = new JitterPrevention(100);

    componentWillReceiveProps() {
        this.setState({
            currentRenderCount: ItemsOfPerPage,
        });
    }

    onScroll = async (e: h.JSX.TargetedUIEvent<HTMLUListElement>) => {
        if (
            e.currentTarget.scrollHeight - e.currentTarget.offsetHeight +
                    e.currentTarget.scrollTop < 1000
        ) {
            const ok = await this.jitter.shouldExecute();
            if (!ok || this.state.currentRenderCount >= this.props.messages.length) {
                return;
            }
            this.setState({
                currentRenderCount: Math.min(
                    this.state.currentRenderCount + ItemsOfPerPage,
                    this.props.messages.length,
                ),
            });
        }
    };

    sortAndSliceMessage = () => {
        return sortMessage(this.props.messages)
            .slice(
                0,
                this.state.currentRenderCount,
            );
    };

    render() {
        const t = Date.now();
        const groups = groupContinuousMessages(this.sortAndSliceMessage(), (pre, cur) => {
            const sameAuthor = pre.event.pubkey == cur.event.pubkey;
            const _66sec = Math.abs(cur.created_at.getTime() - pre.created_at.getTime()) < 1000 * 60;
            return sameAuthor && _66sec;
        });
        const messageBoxGroups = [];
        for (const messages of groups) {
            const profileEvent = this.props.profileGetter.getProfilesByPublicKey(messages[0].author);
            messageBoxGroups.push(
                MessageBoxGroup({
                    messages: messages,
                    myPublicKey: this.props.myPublicKey,
                    emit: this.props.emit,
                    profilesSyncer: this.props.profilesSyncer,
                    eventSyncer: this.props.eventSyncer,
                    authorProfile: profileEvent ? profileEvent.profile : undefined,
                    profileGetter: this.props.profileGetter,
                }),
            );
        }

        const vNode = (
            <div
                class={tw`w-full overflow-hidden`}
                style={{
                    transform: "perspective(none)",
                }}
            >
                <button
                    onClick={() => {
                        if (this.messagesULElement.current) {
                            this.messagesULElement.current.scrollTo({
                                top: this.messagesULElement.current.scrollHeight,
                                left: 0,
                                behavior: "smooth",
                            });
                        }
                    }}
                    class={tw`${IconButtonClass} mobile:hidden fixed z-10 bottom-8 right-4 h-10 w-10 rotate-[-90deg] bg-[#42464D] hover:bg-[#2F3136]`}
                >
                    <LeftArrowIcon
                        class={tw`w-6 h-6`}
                        style={{
                            fill: "#F3F4EA",
                        }}
                    />
                </button>
                <ul
                    class={tw`w-full h-full overflow-y-auto overflow-x-hidden py-9 mobile:py-2 px-2 mobile:px-0 flex flex-col-reverse`}
                    ref={this.messagesULElement}
                    onScroll={this.onScroll}
                >
                    {messageBoxGroups}
                </ul>
            </div>
        );
        console.log("MessageList:end", Date.now() - t);
        return vNode;
    }
}

function MessageBoxGroup(props: {
    authorProfile: ProfileData | undefined;
    messages: ChatMessage[];
    myPublicKey: PublicKey;
    emit: emitFunc<DirectMessagePanelUpdate | ViewUserDetail | SelectConversation>;
    profilesSyncer: ProfileSyncer;
    eventSyncer: EventSyncer;
    profileGetter: ProfileGetter;
}) {
    const messageGroups = props.messages.reverse();
    if (messageGroups.length == 0) {
        return;
    }
    const first_group = messageGroups[0];
    const rows = [];
    rows.push(
        <li
            class={tw`px-4 hover:bg-[#32353B] w-full max-w-full flex items-start pr-8 mobile:pr-4 group relative mobile:select-none`}
        >
            {MessageActions(first_group, props.emit)}
            <Avatar
                class={tw`h-8 w-8 mt-[0.45rem] mr-2`}
                picture={props.authorProfile?.picture}
                onClick={() => {
                    props.emit({
                        type: "ViewUserDetail",
                        pubkey: first_group.author,
                    });
                }}
            />

            <div
                class={tw`flex-1`}
                style={{
                    maxWidth: "calc(100% - 2.75rem)",
                }}
            >
                {NameAndTime(
                    first_group.author,
                    props.authorProfile,
                    props.myPublicKey,
                    first_group.created_at,
                )}
                <pre
                    class={tw`text-[#DCDDDE] whitespace-pre-wrap break-words font-roboto text-sm`}
                >
                    {ParseMessageContent(
                        first_group,
                        props.authorProfile,
                        props.profilesSyncer,
                        props.eventSyncer,
                        props.emit,
                        props.profileGetter,
                        )}
                </pre>
            </div>
        </li>,
    );

    for (let i = 1; i < messageGroups.length; i++) {
        const msg = messageGroups[i];
        rows.push(
            <li
                class={tw`px-4 hover:bg-[#32353B] w-full max-w-full flex items-center pr-8 group relative text-sm mobile:select-none`}
            >
                {MessageActions(msg, props.emit)}
                {Time(msg.created_at)}
                <div
                    class={tw`flex-1`}
                    style={{
                        maxWidth: "calc(100% - 2.75rem)",
                    }}
                >
                    <pre
                        class={tw`text-[#DCDDDE] whitespace-pre-wrap break-words font-roboto`}
                    >
                    {ParseMessageContent(
                        msg,
                        props.authorProfile,
                        props.profilesSyncer,
                        props.eventSyncer,
                        props.emit,
                        props.profileGetter
                        )}
                    </pre>
                </div>
            </li>,
        );
    }

    const vnode = (
        <ul class={tw`py-2`}>
            {rows}
        </ul>
    );

    // console.log("MessageBoxGroup", Date.now() - t);
    return vnode;
}

function MessageActions(
    message: ChatMessage,
    emit: emitFunc<ViewThread | DirectMessagePanelUpdate>,
) {
    return (
        <ButtonGroup
            class={tw`hidden group-hover:flex absolute top-[-0.75rem] right-[3rem]`}
            style={{
                boxShadow: "2px 2px 5px 0 black",
            }}
        >
            <button
                class={tw`w-6 h-6 flex items-center justify-center`}
                onClick={async () => {
                    emit({
                        type: "ViewEventDetail",
                        message: message,
                    });
                }}
            >
                <AboutIcon
                    class={tw`w-4 h-4 scale-150`}
                    style={{
                        fill: PrimaryTextColor,
                    }}
                />
            </button>
        </ButtonGroup>
    );
}

export function Time(created_at: Date) {
    return (
        <div class={tw`w-8 mr-2`}>
            <span
                class={tw`text-[#A3A6AA] text-xs hidden group-hover:inline-block`}
            >
                {created_at.toTimeString().slice(0, 5)}
            </span>
        </div>
    );
}

export function NameAndTime(
    author: PublicKey,
    author_profile: ProfileData | undefined,
    myPublicKey: PublicKey,
    created_at: Date,
) {
    let show = author.bech32();
    if (author.hex == myPublicKey.hex) {
        show = "Me";
    } else if (author_profile?.name) {
        show = author_profile.name;
    }

    return (
        <p class={tw`overflow-hidden flex`}>
            <p class={tw`text-[#FFFFFF] text-[0.9rem] truncate mobile:hidden`}>
                {show}
            </p>
            <p class={tw`text-[#A3A6AA] ml-4 text-[0.8rem] whitespace-nowrap mobile:ml-0 mobile:text-xs`}>
                {created_at.toLocaleString()}
            </p>
        </p>
    );
}

export function ParseMessageContent(
    message: ChatMessage,
    authorProfile: ProfileData | undefined,
    profilesSyncer: ProfileSyncer,
    eventSyncer: EventSyncer,
    emit: emitFunc<ViewUserDetail | ViewThread | ViewNoteThread | SelectConversation>,
    profileGetter: ProfileGetter,
) {
    if (message.type == "image") {
        return <img src={message.content} />;
    }

    let parsedContentItems;
    if (message.type == "gm_invitation") {
        return (
            <InviteCard publicKey={message.invitation.groupAddr} profileGetter={profileGetter} emit={emit} />
        );
    } else if (message.event.kind == NostrKind.Group_Message) {
        parsedContentItems = parseContent(message.content);
    } else {
        parsedContentItems = message.event.parsedContentItems;
    }

    const vnode = [];
    let start = 0;
    for (const item of parsedContentItems) {
        vnode.push(message.content.slice(start, item.start));
        const itemStr = message.content.slice(item.start, item.end + 1);
        switch (item.type) {
            case "url":
                {
                    if (urlIsImage(itemStr)) {
                        vnode.push(<img src={itemStr} />);
                    } else {
                        vnode.push(
                            <a target="_blank" class={tw`hover:underline text-[${LinkColor}]`} href={itemStr}>
                                {itemStr}
                            </a>,
                        );
                    }
                }
                break;
            case "npub":
                {
                    if (authorProfile) {
                        const profile = profileGetter.getProfilesByPublicKey(item.pubkey);
                        vnode.push(
                            <ProfileCard
                                profileData={profile ? profile.profile : undefined}
                                publicKey={item.pubkey}
                                emit={emit}
                            />,
                        );
                        break;
                    } else {
                        profilesSyncer.add(item.pubkey.hex);
                    }
                    vnode.push(
                        <ProfileCard publicKey={item.pubkey} emit={emit} />,
                    );
                }
                break;
            case "note":
                {
                    const event = eventSyncer.syncEvent(item.noteID);
                    if (
                        event instanceof Promise || event.kind == NostrKind.DIRECT_MESSAGE
                    ) {
                        vnode.push(itemStr);
                        break;
                    }
                    const profile = profileGetter.getProfilesByPublicKey(event.publicKey);
                    vnode.push(Card(event, profile ? profile.profile : undefined, emit));
                }
                break;
            case "nevent": {
                const event = eventSyncer.syncEvent(NoteID.FromString(item.event.pointer.id));
                if (
                    event instanceof Promise || event.kind == NostrKind.DIRECT_MESSAGE
                ) {
                    vnode.push(itemStr);
                    break;
                }
                const profile = profileGetter.getProfilesByPublicKey(event.publicKey);
                vnode.push(Card(event, profile ? profile.profile : undefined, emit));
            }
            case "tag":
                // todo
                break;
        }

        start = item.end + 1;
    }
    vnode.push(message.content.slice(start));

    return vnode;
}

function Card(
    event: Parsed_Event,
    authorProfile: ProfileData | undefined,
    emit: emitFunc<ViewThread | ViewUserDetail | ViewNoteThread>,
) {
    switch (event.kind) {
        case NostrKind.META_DATA:
            return <ProfileCard emit={emit} publicKey={event.publicKey} profileData={authorProfile} />;
        case NostrKind.TEXT_NOTE:
            return <NoteCard emit={emit} event={event} profileData={authorProfile} />;
    }
}

type RightPanelProps = {
    emit: emitFunc<DirectMessagePanelUpdate>;
    rightPanelModel: RightPanelModel;
    children: ComponentChildren;
};

function RightPanel(props: RightPanelProps) {
    return (
        <div
            class={tw`mobile:w-full desktop:w-96 bg-[#2F3136] overflow-hidden overflow-y-auto relative${
                props.rightPanelModel.show ? " block" : " hidden"
            }`}
        >
            <button
                class={tw`w-6 min-w-[1.5rem] h-6 ml-4 ${IconButtonClass} hover:bg-[#36393F] absolute right-2 top-3 z-10`}
                onClick={() => {
                    props.emit({
                        type: "ToggleRightPanel",
                        show: false,
                    });
                }}
            >
                <CloseIcon
                    class={tw`w-4 h-4`}
                    style={{
                        stroke: "rgb(185, 187, 190)",
                    }}
                />
            </button>
            {props.children}
        </div>
    );
}

class JitterPrevention {
    constructor(private duration: number) {}
    cancel: ((value: void) => void) | undefined;
    async shouldExecute(): Promise<boolean> {
        if (this.cancel) {
            this.cancel();
            this.cancel = undefined;
            return this.shouldExecute();
        }
        const p = new Promise<void>((resolve) => {
            this.cancel = resolve;
        });
        const cancelled = await sleep(this.duration, p);
        return !cancelled;
    }
}