// Copyright 2024, Command Line Inc.
// SPDX-License-Identifier: Apache-2.0

import * as services from "@/store/services";
import * as util from "@/util/util";
import {
    Table,
    createColumnHelper,
    flexRender,
    getCoreRowModel,
    getSortedRowModel,
    useReactTable,
} from "@tanstack/react-table";
import clsx from "clsx";
import * as jotai from "jotai";
import React from "react";
import { ContextMenuModel } from "../store/contextmenu";
import { atoms, createBlock, getApi } from "../store/global";

import "./directorypreview.less";

interface DirectoryTableProps {
    data: FileInfo[];
    cwd: string;
    focusIndex: number;
    enter: boolean;
    setFocusIndex: (_: number) => void;
    setFileName: (_: string) => void;
}

const columnHelper = createColumnHelper<FileInfo>();

const displaySuffixes = {
    B: "b",
    kB: "k",
    MB: "m",
    GB: "g",
    TB: "t",
    KiB: "k",
    MiB: "m",
    GiB: "g",
    TiB: "t",
};

function getBestUnit(bytes: number, si: boolean = false, sigfig: number = 3): string {
    if (bytes < 0) {
        return "-";
    }
    const units = si ? ["kB", "MB", "GB", "TB"] : ["KiB", "MiB", "GiB", "TiB"];
    const divisor = si ? 1000 : 1024;

    let currentUnit = "B";
    let currentValue = bytes;
    let idx = 0;
    while (currentValue > divisor && idx < units.length - 1) {
        currentUnit = units[idx];
        currentValue /= divisor;
        idx += 1;
    }

    return `${parseFloat(currentValue.toPrecision(sigfig))}${displaySuffixes[currentUnit]}`;
}

function getSpecificUnit(bytes: number, suffix: string): string {
    if (bytes < 0) {
        return "-";
    }

    const divisors = new Map([
        ["B", 1],
        ["kB", 1e3],
        ["MB", 1e6],
        ["GB", 1e9],
        ["TB", 1e12],
        ["KiB", 0x400],
        ["MiB", 0x400 ** 2],
        ["GiB", 0x400 ** 3],
        ["TiB", 0x400 ** 4],
    ]);
    const divisor: number = divisors[suffix] ?? 1;

    return `${bytes / divisor} ${displaySuffixes[suffix]}`;
}

function getLastModifiedTime(
    unixMillis: number,
    locale: Intl.LocalesArgument,
    options: DateTimeFormatConfigType
): string {
    if (locale === "C") {
        locale = "lookup";
    }
    return new Date(unixMillis).toLocaleString(locale, options); //todo use config
}

const iconRegex = /^[a-z0-9- ]+$/;

function isIconValid(icon: string): boolean {
    if (util.isBlank(icon)) {
        return false;
    }
    return icon.match(iconRegex) != null;
}

function getIconClass(icon: string): string {
    if (!isIconValid(icon)) {
        return "fa fa-solid fa-question fa-fw";
    }
    return `fa fa-solid fa-${icon} fa-fw`;
}

function getSortIcon(sortType: string | boolean): React.ReactNode {
    switch (sortType) {
        case "asc":
            return <i className="fa-solid fa-chevron-up dir-table-head-direction"></i>;
        case "desc":
            return <i className="fa-solid fa-chevron-down dir-table-head-direction"></i>;
        default:
            return null;
    }
}

function handleFileContextMenu(e: React.MouseEvent<HTMLDivElement>, path: string) {
    e.preventDefault();
    e.stopPropagation();
    let menu: ContextMenuItem[] = [];
    menu.push({
        label: "Open in New Block",
        click: async () => {
            const blockDef = {
                view: "preview",
                meta: { file: path },
            };
            await createBlock(blockDef);
        },
    });
    menu.push({
        label: "Delete File",
        click: async () => {
            await services.FileService.DeleteFile(path).catch((e) => console.log(e)); //todo these errors need a popup
        },
    });
    menu.push({
        label: "Download File",
        click: async () => {
            getApi().downloadFile(path);
        },
    });
    ContextMenuModel.showContextMenu(menu, e);
}

function cleanMimetype(input: string): string {
    const truncated = input.split(";")[0];
    return truncated.trim();
}

function DirectoryTable({ data, cwd, focusIndex, enter, setFocusIndex, setFileName }: DirectoryTableProps) {
    let settings = jotai.useAtomValue(atoms.settingsConfigAtom);
    const getIconFromMimeType = React.useCallback(
        (mimeType: string): string => {
            while (mimeType.length > 0) {
                let icon = settings.mimetypes[mimeType]?.icon ?? null;
                if (isIconValid(icon)) {
                    return `fa fa-solid fa-${icon} fa-fw`;
                }
                mimeType = mimeType.slice(0, -1);
            }
            return "fa fa-solid fa-file fa-fw";
        },
        [settings.mimetypes]
    );
    const getIconColor = React.useCallback(
        (mimeType: string): string => {
            let iconColor = settings.mimetypes[mimeType]?.color ?? "inherit";
            return iconColor;
        },
        [settings.mimetypes]
    );
    const columns = React.useMemo(
        () => [
            columnHelper.accessor("mimetype", {
                cell: (info) => (
                    <i
                        className={getIconFromMimeType(info.getValue() ?? "")}
                        style={{ color: getIconColor(info.getValue() ?? "") }}
                    ></i>
                ),
                header: () => <span></span>,
                id: "logo",
                size: 25,
                enableSorting: false,
            }),
            columnHelper.accessor("path", {
                cell: (info) => <span className="dir-table-path">{info.getValue()}</span>,
                header: () => <span>Name</span>,
                sortingFn: "alphanumeric",
            }),
            columnHelper.accessor("modestr", {
                cell: (info) => <span className="dir-table-modestr">{info.getValue()}</span>,
                header: () => <span>Permissions</span>,
                size: 91,
                sortingFn: "alphanumeric",
            }),
            columnHelper.accessor("modtime", {
                cell: (info) => (
                    <span className="dir-table-lastmod">
                        {getLastModifiedTime(info.getValue(), settings.datetime.locale, settings.datetime.format)}
                    </span>
                ),
                header: () => <span>Last Modified</span>,
                size: 185,
                sortingFn: "datetime",
            }),
            columnHelper.accessor("size", {
                cell: (info) => <span className="dir-table-size">{getBestUnit(info.getValue())}</span>,
                header: () => <span>Size</span>,
                size: 55,
                sortingFn: "auto",
            }),
            columnHelper.accessor("mimetype", {
                cell: (info) => <span className="dir-table-type">{cleanMimetype(info.getValue() ?? "")}</span>,
                header: () => <span>Type</span>,
                sortingFn: "alphanumeric",
            }),
        ],
        [settings]
    );

    const table = useReactTable({
        data,
        columns,
        columnResizeMode: "onChange",
        getSortedRowModel: getSortedRowModel(),
        getCoreRowModel: getCoreRowModel(),
        initialState: {
            sorting: [
                {
                    id: "path",
                    desc: false,
                },
            ],
        },
        enableMultiSort: false,
        enableSortingRemoval: false,
    });

    const columnSizeVars = React.useMemo(() => {
        const headers = table.getFlatHeaders();
        const colSizes: { [key: string]: number } = {};
        for (let i = 0; i < headers.length; i++) {
            const header = headers[i]!;
            colSizes[`--header-${header.id}-size`] = header.getSize();
            colSizes[`--col-${header.column.id}-size`] = header.column.getSize();
        }
        return colSizes;
    }, [table.getState().columnSizingInfo]);

    return (
        <div className="dir-table" style={{ ...columnSizeVars }}>
            <div className="dir-table-head">
                {table.getHeaderGroups().map((headerGroup) => (
                    <div className="dir-table-head-row" key={headerGroup.id}>
                        {headerGroup.headers.map((header) => (
                            <div
                                className="dir-table-head-cell"
                                key={header.id}
                                style={{ width: `calc(var(--header-${header.id}-size) * 1px)` }}
                                onClick={() => header.column.toggleSorting()}
                            >
                                {header.isPlaceholder
                                    ? null
                                    : flexRender(header.column.columnDef.header, header.getContext())}
                                {getSortIcon(header.column.getIsSorted())}
                                <div
                                    className="dir-table-head-resize"
                                    onMouseDown={header.getResizeHandler()}
                                    onTouchStart={header.getResizeHandler()}
                                />
                            </div>
                        ))}
                    </div>
                ))}
            </div>
            {table.getState().columnSizingInfo.isResizingColumn ? (
                <MemoizedTableBody
                    table={table}
                    cwd={cwd}
                    focusIndex={focusIndex}
                    enter={enter}
                    setFileName={setFileName}
                    setFocusIndex={setFocusIndex}
                />
            ) : (
                <TableBody
                    table={table}
                    cwd={cwd}
                    focusIndex={focusIndex}
                    enter={enter}
                    setFileName={setFileName}
                    setFocusIndex={setFocusIndex}
                />
            )}
        </div>
    );
}

interface TableBodyProps {
    table: Table<FileInfo>;
    cwd: string;
    focusIndex: number;
    enter: boolean;
    setFocusIndex: (_: number) => void;
    setFileName: (_: string) => void;
}

function TableBody({ table, cwd, focusIndex, enter, setFocusIndex, setFileName }: TableBodyProps) {
    let [refresh, setRefresh] = React.useState(false);

    React.useEffect(() => {
        const selected = (table.getSortedRowModel()?.flatRows[focusIndex]?.getValue("path") as string) ?? null;
        if (selected != null) {
            console.log("yipee");
            const fullPath = cwd.concat("/", selected);
            setFileName(fullPath);
        }
    }, [enter]);

    table.getRow;
    return (
        <div className="dir-table-body">
            {table.getRowModel().rows.map((row, idx) => (
                <div
                    className={clsx("dir-table-body-row", { focused: focusIndex === idx })}
                    key={row.id}
                    onDoubleClick={() => {
                        const newFileName = row.getValue("path") as string;
                        const fullPath = cwd.concat("/", newFileName);
                        setFileName(fullPath);
                    }}
                    onClick={() => setFocusIndex(idx)}
                    onContextMenu={(e) => handleFileContextMenu(e, cwd.concat("/", row.getValue("path") as string))}
                >
                    {row.getVisibleCells().map((cell) => {
                        return (
                            <div
                                className={clsx("dir-table-body-cell", "col-" + cell.column.id)}
                                key={cell.id}
                                style={{ width: `calc(var(--col-${cell.column.id}-size) * 1px)` }}
                            >
                                {flexRender(cell.column.columnDef.cell, cell.getContext())}
                            </div>
                        );
                    })}
                </div>
            ))}
        </div>
    );
}

const MemoizedTableBody = React.memo(
    TableBody,
    (prev, next) => prev.table.options.data == next.table.options.data
) as typeof TableBody;

interface DirectoryPreviewProps {
    fileNameAtom: jotai.WritableAtom<string, [string], void>;
}

function DirectoryPreview({ fileNameAtom }: DirectoryPreviewProps) {
    const [searchText, setSearchText] = React.useState("");
    let [focusIndex, setFocusIndex] = React.useState(0);
    const [content, setContent] = React.useState<FileInfo[]>([]);
    let [fileName, setFileName] = jotai.useAtom(fileNameAtom);
    const [enter, setEnter] = React.useState(false);

    React.useEffect(() => {
        const getContent = async () => {
            const file = await services.FileService.ReadFile(fileName);
            const serializedContent = util.base64ToString(file?.data64);
            let content: FileInfo[] = JSON.parse(serializedContent);
            let filtered = content.filter((fileInfo) => {
                return fileInfo.path.toLowerCase().includes(searchText);
            });
            setContent(filtered);
        };
        getContent();
    }, [fileName, searchText]);

    const handleKeyDown = React.useCallback(
        (e) => {
            switch (e.key) {
                case "Escape":
                    //todo: escape block focus
                    break;
                case "ArrowUp":
                    e.preventDefault();
                    setFocusIndex((idx) => Math.max(idx - 1, 0));
                    break;
                case "ArrowDown":
                    e.preventDefault();
                    setFocusIndex((idx) => Math.min(idx + 1, content.length - 1));
                    break;
                case "Enter":
                    e.preventDefault();
                    console.log("enter thinks focus Index is ", focusIndex);
                    let newFileName = content[focusIndex].path;
                    console.log(
                        "enter thinks contents are",
                        content.slice(0, focusIndex + 1).map((fi) => fi.path)
                    );
                    setEnter((current) => !current);
                    /*
                    const fullPath = fileName.concat("/", newFileName);
                    setFileName(fullPath);
					*/
                    break;
                default:
            }
        },
        [content, focusIndex, setEnter]
    );

    React.useEffect(() => {
        console.log(focusIndex);
    }, [focusIndex]);

    React.useEffect(() => {
        document.addEventListener("keydown", handleKeyDown);

        return () => {
            document.removeEventListener("keydown", handleKeyDown);
        };
    }, [handleKeyDown]);

    return (
        <>
            <div className="dir-table-search-line">
                <label>Search:</label>

                <input
                    type="text"
                    className="dir-table-search-box"
                    onChange={(e) => setSearchText(e.target.value.toLowerCase())}
                    maxLength={400}
                    autoFocus={true}
                />
            </div>
            <DirectoryTable
                data={content}
                cwd={fileName}
                focusIndex={focusIndex}
                enter={enter}
                setFileName={setFileName}
                setFocusIndex={setFocusIndex}
            />
        </>
    );
}

export { DirectoryPreview };