/*
 * Copyright (C) 2024 Red Hat, Inc.
 * SPDX-License-Identifier: LGPL-2.1-or-later
 */

import cockpit from "cockpit";

import { ManifestKeyword, ManifestDocs, ManifestSection, Manifest, Manifests } from "./manifests";
import { Machine } from "./machines/machines";

export interface Location {
    host: string;
    path: string;
    hash: string;
}

export function encode_location(location: Partial<Location>): string {
    const shell_embedded = window.location.pathname.indexOf(".html") !== -1;
    if (shell_embedded)
        return window.location.toString();

    const path = [];
    if (location.host && location.host !== "localhost")
        path.push("@" + location.host);
    if (location.path)
        path.push(...location.path.split("/"));
    let string = cockpit.location.encode(path, undefined, true);
    if (location.hash && location.hash !== "/")
        string += "#" + location.hash;
    return string;
}

/* Decodes navigate state from a string */
export function decode_location(string: string): Location {
    let hash = "";
    const pos = string.indexOf("#");
    if (pos !== -1) {
        hash = string.substring(pos + 1);
        string = string.substring(0, pos);
    }
    if (string[0] !== '/')
        string = "/" + string;
    const path = cockpit.location.decode(string);
    let host;
    if (path[0] && path[0][0] === "@")
        host = (path.shift() as string).substring(1);
    else
        host = "localhost";
    if (path.length && path[path.length - 1] === "index")
        path.pop();
    return { host, path: path.join("/"), hash };
}

export function decode_window_location(): Location {
    const shell_embedded = window.location.pathname.indexOf(".html") !== -1;

    if (shell_embedded)
        return decode_location("/" + window.location.hash);
    else
        return decode_location(window.location.pathname + window.location.hash);
}

export function replace_window_location(location: Partial<Location>): void {
    window.history.replaceState(null, "", encode_location(location));
}

export function push_window_location(location: Partial<Location>): void {
    window.history.pushState(null, "", encode_location(location));
}

export interface ManifestItem {
    path: string;
    hash: string;
    section: string;
    label: string;
    order: number;
    docs: ManifestDocs[] | undefined;
    keywords: ManifestKeyword[];
}

export class CompiledComponents {
    manifests: Manifests;
    items: { [path: string] : ManifestItem; } = { };

    constructor(manifests?: Manifests) {
        this.manifests = manifests || { };
    }

    load(section: string, getter: (man: Manifest) => ManifestSection | undefined): void {
        Object.entries(this.manifests).forEach(([name, manifest]) => {
            const manifest_section = getter(manifest) || {};
            Object.entries(manifest_section).forEach(([prop, info]) => {
                const item: ManifestItem = {
                    path: "", // set below
                    hash: "", // set below
                    section,
                    label: info.label ? cockpit.gettext(info.label) : prop,
                    order: info.order === undefined ? 1000 : info.order,
                    docs: info.docs,
                    keywords: info.keywords || [{ matches: [], weight: 3, translate: true, goto: undefined }],
                };

                // Always first keyword should be page name
                const page_name = item.label.toLowerCase();
                if (item.keywords[0].matches.indexOf(page_name) < 0)
                    item.keywords[0].matches.unshift(page_name);

                // Keywords from manifest have different defaults than are usual
                item.keywords.forEach(i => {
                    i.weight = i.weight || 3;
                    i.translate = i.translate === undefined ? true : i.translate;
                });

                if (info.path)
                    item.path = info.path.replace(/\.html$/, "");
                else
                    item.path = name + "/" + prop;

                /* Split out any hash in the path */
                const pos = item.path.indexOf("#");
                if (pos !== -1) {
                    item.hash = item.path.substring(pos + 1);
                    item.path = item.path.substring(0, pos);
                }

                /* Fix component for compatibility and normalize it */
                if (item.path.indexOf("/") === -1)
                    item.path = name + "/" + item.path;
                if (item.path.slice(-6) === "/index")
                    item.path = item.path.slice(0, -6);
                this.items[item.path] = item;
            });
        });
    }

    ordered(section: string): ManifestItem[] {
        const list: ManifestItem[] = [];
        for (const x in this.items) {
            if (!section || this.items[x].section === section)
                list.push(this.items[x]);
        }
        list.sort(function(a, b) {
            let ret = a.order - b.order;
            if (ret === 0)
                ret = a.label.localeCompare(b.label);
            return ret;
        });
        return list;
    }

    find_path_item(path: string): ManifestItem {
        let component = path;
        if (this.items[path] === undefined) {
            let s = path;
            while (s && this.items[s] === undefined)
                s = s.substring(0, s.lastIndexOf("/"));
            component = s;
        }

        // Still don't know where it comes from, check for parent
        if (!component) {
            const comp = this.manifests[path];
            if (comp && comp.parent && comp.parent.component)
                component = comp.parent.component;
        }

        const item = this.items[component];
        if (item)
            return item;

        // Return something that can be used when the user navigates
        // to a URL for a non-existing component.

        return {
            path,
            label: path,
            section: "menu",
            hash: "",
            order: 3,
            keywords: [],
            docs: undefined
        };
    }

    find_path_manifest(path: string): Manifest {
        const parts = path.split("/");
        const pkg = parts[0];

        return (this.manifests[pkg]) || { };
    }
}

export function compile_manifests(manifests?: Manifests): CompiledComponents {
    const compiled = new CompiledComponents(manifests);
    compiled.load("tools", m => m.tools);
    compiled.load("dashboard", m => m.dashboard);
    compiled.load("menu", m => m.menu);
    return compiled;
}

function component_checksum(machine: Machine, path: string): string | undefined {
    const parts = path.split("/");
    const pkg = parts[0];
    if (machine.manifests && machine.manifests[pkg] && machine.manifests[pkg][".checksum"])
        return "$" + machine.manifests[pkg][".checksum"];
}

export function compute_frame_url(machine: Machine, path: string): string {
    let base;
    let checksum;
    if (machine.manifests && machine.manifests[".checksum"])
        checksum = "$" + machine.manifests[".checksum"];
    else
        checksum = machine.checksum;

    if (checksum && checksum === component_checksum(machine, path)) {
        if (machine.connection_string === "localhost")
            base = "..";
        else
            base = "../../" + checksum;
    } else {
        /* If we don't have any checksums, or if the component specifies a different
           checksum than the machine, load it via a non-caching @<host> path.  This
           makes sure that we get the right files, and also that we don't poisen the
           cache with wrong files.

           We can't use a $<component-checksum> path since cockpit-ws only knows how to
           route the machine checksum.

           TODO - make it possible to use $<component-checksum>.
        */
        base = "../../@" + machine.connection_string;
    }

    let url = base + "/" + path;
    if (path.indexOf("/") === -1)
        url += "/index";
    url += ".html";

    return url;
}