/**

   Settings utility shared between the running extension and the preference UI.

 */
var Extension;
if (imports.misc.extensionUtils.extensions) {
    Extension = imports.misc.extensionUtils.extensions["paperwm@hedning:matrix.org"];
} else {
    // Cannot relaiably test for imports.ui in the preference ui
    try {
        Extension = imports.ui.main.extensionManager.lookup("paperwm@hedning:matrix.org");
    } catch(e) {
        Extension = imports.misc.extensionUtils.getCurrentExtension();
    }
}

var Gio = imports.gi.Gio;
var GLib = imports.gi.GLib;
var Gtk = imports.gi.Gtk;

var Convenience = Extension.imports.convenience;
var settings = Convenience.getSettings();
var workspaceSettingsCache = {};

var WORKSPACE_KEY = 'org.gnome.Shell.Extensions.PaperWM.Workspace';
var WORKSPACE_LIST_KEY = 'org.gnome.Shell.Extensions.PaperWM.WorkspaceList';
var KEYBINDINGS_KEY = 'org.gnome.Shell.Extensions.PaperWM.Keybindings';

// This is the value mutter uses for the keyvalue of above_tab
var META_KEY_ABOVE_TAB = 0x2f7259c9;

var prefs = {};
['window-gap', 'vertical-margin', 'vertical-margin-bottom', 'horizontal-margin',
 'workspace-colors', 'default-background', 'animation-time', 'use-workspace-name',
 'pressure-barrier', 'default-show-top-bar', 'swipe-sensitivity', 'swipe-friction',
 'cycle-width-steps', 'cycle-height-steps']
    .forEach((k) => setState(null, k));

function setVerticalMargin() {
    let vMargin = settings.get_int('vertical-margin');
    let gap = settings.get_int('window-gap');
    prefs.vertical_margin = Math.max(Math.round(gap/2), vMargin);
}
let timerId;
function onWindowGapChanged() {
    setVerticalMargin();
    if (timerId)
        imports.mainloop.source_remove(timerId);
    timerId = imports.mainloop.timeout_add(500, () => {
        Extension.imports.tiling.spaces.mru().forEach(space => {
            space.layout();
        });
        timerId = null;
    });
}

function setState($, key) {
    let value = settings.get_value(key);
    let name = key.replace(/-/g, '_');
    prefs[name] = value.deep_unpack();
}

var schemaSource, workspaceList, conflictSettings;
function setSchemas() {
    // Schemas that may contain conflicting keybindings
    // It's possible to inject or remove settings here on `user.init`.
    conflictSettings = [
        new Gio.Settings({schema_id: 'org.gnome.mutter.keybindings'}),
        new Gio.Settings({schema_id: 'org.gnome.mutter.wayland.keybindings'}),
        new Gio.Settings({schema_id: "org.gnome.desktop.wm.keybindings"}),
        new Gio.Settings({schema_id: "org.gnome.shell.keybindings"})
    ];
    schemaSource = Gio.SettingsSchemaSource.new_from_directory(
        GLib.build_filenamev([Extension.path, "schemas"]),
        Gio.SettingsSchemaSource.get_default(),
        false
    );

    workspaceList = new Gio.Settings({
        settings_schema: schemaSource.lookup(WORKSPACE_LIST_KEY, true)
    });
}
setSchemas(); // Initialize imediately so prefs.js can import properly
function init() {
    settings.connect('changed', setState);
    settings.connect('changed::vertical-margin', onWindowGapChanged);
    settings.connect('changed::vertical-margin-bottom', onWindowGapChanged);
    settings.connect('changed::window-gap', onWindowGapChanged);
    setVerticalMargin();

    // A intermediate window is created before the prefs dialog is created.
    // Prevent it from being inserted into the tiling causing flickering and general disorder
    defwinprop({
        wm_class: "Gnome-shell-extension-prefs",
        scratch_layer: true,
        focus: true,
    });
    defwinprop({
        wm_class: /gnome-screenshot/i,
        scratch_layer: true,
        focus: true,
    });
}

var id;
function enable() {
    setSchemas();
}

function disable() {
    workspaceSettingsCache = {};
}

/// Workspaces


function getWorkspaceSettings(index) {
    let list = workspaceList.get_strv('list');
    for (let uuid of list) {
        let settings = getWorkspaceSettingsByUUID(uuid);
        if (settings.get_int('index') === index) {
            return [uuid, settings];
        }
    }
    return getNewWorkspaceSettings(index);
}

function getNewWorkspaceSettings(index) {
    let uuid = GLib.uuid_string_random();
    let settings = getWorkspaceSettingsByUUID(uuid);
    let list = workspaceList.get_strv('list');
    list.push(uuid);
    workspaceList.set_strv('list', list);
    settings.set_int('index', index);
    return [uuid, settings];
}

function getWorkspaceSettingsByUUID(uuid) {
    if (!workspaceSettingsCache[uuid]) {
        let settings = new Gio.Settings({
            settings_schema: schemaSource.lookup(WORKSPACE_KEY, true),
            path: `/org/gnome/shell/extensions/paperwm/workspaces/${uuid}/`
        });
        workspaceSettingsCache[uuid] = settings;
    }
    return workspaceSettingsCache[uuid];
}

/** Returns [[uuid, settings, name], ...] (Only used for debugging/development atm.) */
function findWorkspaceSettingsByName(regex) {
    let list = workspaceList.get_strv('list');
    let settingss = list.map(getWorkspaceSettingsByUUID);
    return Extension.imports.utils.zip(list, settingss, settingss.map(s => s.get_string('name')))
        .filter(([uuid, s, name]) => name.match(regex));
}

/** Only used for debugging/development atm. */
function deleteWorkspaceSettingsByName(regex, dryrun=true) {
    let out = ""
    function rprint(...args) { print(...args); out += args.join(" ") + "\n"; }
    let n = global.workspace_manager.get_n_workspaces();
    for (let [uuid, s, name] of findWorkspaceSettingsByName(regex)) {
        let index = s.get_int('index');
        if (index < n) {
            rprint("Skipping in-use settings", name, index);
            continue;
        }
        rprint(dryrun ? "[dry]" : "", `Delete settings for '${name}' (${uuid})`);
        if (!dryrun) {
            deleteWorkspaceSettings(uuid);
        }
    }
    return out;
}

/** Only used for debugging/development atm. */
function deleteWorkspaceSettings(uuid) {
    // NB! Does not check if the settings is currently in use. Does not reindex subsequent settings.
    let list = workspaceList.get_strv('list');
    let i = list.indexOf(uuid);
    let settings = getWorkspaceSettingsByUUID(list[i]);
    for (let key of settings.list_keys()) {
        // Hopefully resetting all keys will delete the relocatable settings from dconf?
        settings.reset(key);
    }

    list.splice(i, 1);
    workspaceList.set_strv('list', list);
}

// Useful for debugging
function printWorkspaceSettings() {
    let list = workspaceList.get_strv('list');
    let settings = list.map(getWorkspaceSettingsByUUID);
    let zipped = Extension.imports.utils.zip(list, settings);
    const key = s => s[1].get_int('index');
    zipped.sort((a,b) => key(a) - key(b));
    for (let [uuid, s] of zipped) {
        print('index:', s.get_int('index'), s.get_string('name'), s.get_string('color'), uuid);
    }
}

/// Keybindings

/**
 * Two keystrings can represent the same key combination
 */
function keystrToKeycombo(keystr) {
    // Above_Tab is a fake keysymbol provided by mutter
    let aboveTab = false;
    if (keystr.match(/Above_Tab/)) {
        // Gtk bails out if provided with an unknown keysymbol
        keystr = keystr.replace('Above_Tab', 'A');
        aboveTab = true;
    }
    let [key, mask] = Gtk.accelerator_parse(keystr);
    if (aboveTab)
        key = META_KEY_ABOVE_TAB;
    return `${key}|${mask}`; // Since js doesn't have a mapable tuple type
}

function keycomboToKeystr(combo) {
    let [mutterKey, mods] = combo.split('|').map(s => Number.parseInt(s));
    let key = mutterKey;
    if (mutterKey === META_KEY_ABOVE_TAB)
        key = 97; // a
    let keystr = Gtk.accelerator_name(key, mods);
    if (mutterKey === META_KEY_ABOVE_TAB)
        keystr = keystr.replace(/a$/, 'Above_Tab');
    return keystr;
}

function generateKeycomboMap(settings) {
    let map = {};
    for (let name of settings.list_keys()) {
        let value = settings.get_value(name);
        if (value.get_type_string() !== 'as')
            continue;

        for (let combo of value.deep_unpack().map(keystrToKeycombo)) {
            if (combo === '0|0')
                continue;
            if (map[combo]) {
                map[combo].push(name);
            } else {
                map[combo] = [name];
            }
        }
    }
    return map;
}

function findConflicts(schemas) {
    schemas = schemas || conflictSettings;
    let conflicts = [];
    const paperMap =
          generateKeycomboMap(Convenience.getSettings(KEYBINDINGS_KEY));

    for (let settings of schemas) {
        const against = generateKeycomboMap(settings);
        for (let combo in paperMap) {
            if (against[combo]) {
                conflicts.push({
                    name: paperMap[combo][0],
                    conflicts: against[combo],
                    settings, combo
                });
            }
        }
    }
    return conflicts;
}


/// Winprops

/**
   Modelled after notion/ion3's system

   Examples:

   defwinprop({
     wm_class: "Riot",
     scratch_layer: true
   })
*/
var winprops = [];

function winprop_match_p(meta_window, prop) {
    let wm_class = meta_window.wm_class || "";
    let title = meta_window.title;
    if (prop.wm_class.constructor === RegExp) {
        if (!wm_class.match(prop.wm_class))
            return false;
    } else if (prop.wm_class !== wm_class) {
        return false;
    }
    if (prop.title) {
        if (prop.title.constructor === RegExp) {
            if (!title.match(prop.title))
                return false;
        } else {
            if (prop.title !== title)
                return false;
        }
    }

    return true;
}

function find_winprop(meta_window)  {
    let props = winprops.filter(
        winprop_match_p.bind(null, meta_window));

    return props[0];
}

function defwinprop(spec) {
    winprops.push(spec);
}