/*******************************************************************************

    µBlock - a browser extension to block requests.
    Copyright (C) 2014 The µBlock authors

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see {http://www.gnu.org/licenses/}.

    Home: https://github.com/gorhill/uBlock
*/

/* global µBlock, SafariBrowserTab */

// For background page

/******************************************************************************/

(function() {

'use strict';

/******************************************************************************/

var vAPI = self.vAPI = self.vAPI || {};

vAPI.safari = true;

/******************************************************************************/

vAPI.app = safari.extension.toolbarItems[0].toolTip.split(' ');
vAPI.app = {
    name: vAPI.app[0],
    version: vAPI.app[1]
};

/******************************************************************************/

vAPI.app.restart = function() {
};

/******************************************************************************/

// addContentScriptFromURL allows whitelisting,
// so load sitepaching this way, instead of adding it to the Info.plist

safari.extension.addContentScriptFromURL(
    safari.extension.baseURI + 'js/sitepatch-safari.js',
    [
        'http://www.youtube.com/*',
        'https://www.youtube.com/*',
        'http://www.youtube-nocookie.com/*',
        'https://www.youtube-nocookie.com/*'
    ]
);

/******************************************************************************/

safari.extension.settings.addEventListener('change', function(e) {
    if ( e.key === 'open_prefs' ) {
        vAPI.tabs.open({
            url: 'dashboard.html',
            active: true
        });
    }
}, false);

/******************************************************************************/

vAPI.storage = {
    _storage: safari.extension.settings,
    QUOTA_BYTES: 52428800, // copied from Info.plist

    get: function(keys, callback) {
        if ( typeof callback !== 'function' ) {
            return;
        }

        var i, value, result = {};

        if ( keys === null ) {
            for ( i in this._storage ) {
                value = this._storage[i];

                if ( typeof value === 'string' ) {
                    result[i] = JSON.parse(value);
                }
            }
        } else if ( typeof keys === 'string' ) {
            value = this._storage[keys];

            if ( typeof value === 'string' ) {
                result[keys] = JSON.parse(value);
            }
        } else if ( Array.isArray(keys) ) {
            for ( i = 0; i < keys.length; i++ ) {
                value = this._storage[i];

                if ( typeof value === 'string' ) {
                    result[keys[i]] = JSON.parse(value);
                }
            }
        } else if ( typeof keys === 'object' ) {
            for ( i in keys ) {
                value = this._storage[i];

                if ( typeof value === 'string' ) {
                    result[i] = JSON.parse(value);
                } else {
                    result[i] = keys[i];
                }
            }
        }

        callback(result);
    },

    set: function(details, callback) {
        for ( var key in details ) {
            if ( !details.hasOwnProperty(key) ) {
                continue;
            }
            this._storage.setItem(key, JSON.stringify(details[key]));
        }

        if ( typeof callback === 'function' ) {
            callback();
        }
    },

    remove: function(keys) {
        if ( typeof keys === 'string' ) {
            keys = [keys];
        }

        for ( var i = 0; i < keys.length; i++ ) {
            this._storage.removeItem(keys[i]);
        }
    },

    clear: function(callback) {
        this._storage.clear();
        callback();
    },

    getBytesInUse: function(keys, callback) {
        if ( typeof callback !== 'function' ) {
            return;
        }

        var i;
        var size = 0;

        if ( keys === null ) {
            for ( i in this._storage ) {
                size += (this._storage[i] || '').length;
            }
        } else {
            if ( typeof keys === 'string' ) {
                keys = [keys];
            }

            for ( i = 0; i < keys.length; i++ ) {
                size += (this._storage[keys[i]] || '').length;
            }
        }

        callback(size);
    }
};

/******************************************************************************/

vAPI.tabs = {
    stack: {},
    stackId: 1
};

/******************************************************************************/

vAPI.tabs.registerListeners = function() {
    var onNavigation = this.onNavigation;

    this.onNavigation = function(e) {
        // e.url is not present for local files or data URIs,
        // or probably for those URLs which we don't have access to
        if ( !e.target || !e.target.url ) {
            return;
        }

        onNavigation({
            frameId: 0,
            tabId: vAPI.tabs.getTabId(e.target),
            url: e.target.url
        });
    };

    safari.application.addEventListener('navigate', this.onNavigation, true);

    // onClosed handled in the main tab-close event
    // onUpdated handled via monitoring the history.pushState on web-pages
    // onPopup is handled in window.open on web-pages
};

/******************************************************************************/

vAPI.tabs.getTabId = function(tab) {
    for ( var i in vAPI.tabs.stack ) {
        if ( vAPI.tabs.stack[i] === tab ) {
            return +i;
        }
    }

    return -1;
};

/******************************************************************************/

vAPI.tabs.get = function(tabId, callback) {
    var tab;

    if ( tabId === null ) {
        tab = safari.application.activeBrowserWindow.activeTab;
        tabId = this.getTabId(tab);
    } else {
        tab = this.stack[tabId];
    }

    if ( !tab ) {
        callback();
        return;
    }

    callback({
        id: tabId,
        index: tab.browserWindow.tabs.indexOf(tab),
        windowId: safari.application.browserWindows.indexOf(tab.browserWindow),
        active: tab === tab.browserWindow.activeTab,
        url: tab.url,
        title: tab.title
    });
};

/******************************************************************************/

// properties of the details object:
//   url: 'URL', // the address that will be opened
//   tabId: 1, // the tab is used if set, instead of creating a new one
//   index: -1, // undefined: end of the list, -1: following tab, or after index
//   active: false, // opens the tab in background - true and undefined: foreground
//   select: true // if a tab is already opened with that url, then select it instead of opening a new one

vAPI.tabs.open = function(details) {
    if ( !details.url ) {
        return null;
    }
    // extension pages
    if ( /^[\w-]{2,}:/.test(details.url) === false ) {
        details.url = vAPI.getURL(details.url);
    }

    var curWin, tab;

    if ( details.select ) {
        tab = safari.application.browserWindows.some(function(win) {
            var rgxHash = /#.*/;
            // this is questionable
            var url = details.url.replace(rgxHash, '');

            for ( var i = 0; i < win.tabs.length; i++ ) {
                if ( win.tabs[i].url.replace(rgxHash, '') === url ) {
                    win.tabs[i].activate();
                    return true;
                }
            }
        });

        if ( tab ) {
            return;
        }
    }

    if ( details.active === undefined ) {
        details.active = true;
    }

    curWin = safari.application.activeBrowserWindow;

    // it must be calculated before opening a new tab,
    // otherwise the new tab will be the active tab here
    if ( details.index === -1 ) {
        details.index = curWin.tabs.indexOf(curWin.activeTab) + 1;
    }

    tab = details.tabId && this.stack[details.tabId]
        || curWin.openTab(details.active ? 'foreground' : 'background');

    if ( details.index !== undefined ) {
        curWin.insertTab(tab, details.index);
    }

    tab.url = details.url;
};

/******************************************************************************/

vAPI.tabs.remove = function(tabIds) {
    if ( tabIds instanceof SafariBrowserTab ) {
        tabIds = this.getTabId(tabIds);
    }

    if ( !Array.isArray(tabIds) ) {
        tabIds = [tabIds];
    }

    for ( var i = 0; i < tabIds.length; i++ ) {
        if ( this.stack[tabIds[i]] ) {
            this.stack[tabIds[i]].close();
        }
    }
};

/******************************************************************************/

vAPI.tabs.reload = function(tabId) {
    var tab = this.stack[tabId];

    if ( tab ) {
        tab.url = tab.url;
    }
};

/******************************************************************************/

vAPI.tabs.injectScript = function(tabId, details, callback) {
    var tab;

    if ( tabId ) {
        tab = this.stack[tabId];
    } else {
        tab = safari.application.activeBrowserWindow.activeTab;
    }

    if ( details.file ) {
        var xhr = new XMLHttpRequest;
        xhr.overrideMimeType('application/x-javascript;charset=utf-8');
        xhr.open('GET', details.file, false);
        xhr.send();
        details.code = xhr.responseText;
    }

    tab.page.dispatchMessage('broadcast', {
        channelName: 'vAPI',
        msg: {
            cmd: 'injectScript',
            details: details
        }
    });

    if ( typeof callback === 'function' ) {
        setTimeout(callback, 13);
    }
};

/******************************************************************************/

// bind tabs to unique IDs

(function() {
    var wins = safari.application.browserWindows, i = wins.length, j;

    while ( i-- ) {
        j = wins[i].tabs.length;

        while ( j-- ) {
            vAPI.tabs.stack[vAPI.tabs.stackId++] = wins[i].tabs[j];
        }
    }
})();

/******************************************************************************/

safari.application.addEventListener('open', function(e) {
    // ignore windows
    if ( e.target instanceof SafariBrowserTab ) {
        vAPI.tabs.stack[vAPI.tabs.stackId++] = e.target;
    }
}, true);

/******************************************************************************/

safari.application.addEventListener('close', function(e) {
    // ignore windows
    if ( !(e.target instanceof SafariBrowserTab) ) {
        return;
    }

    var tabId = vAPI.tabs.getTabId(e.target);

    if ( tabId !== -1 ) {
        // to not add another listener, put this here
        // instead of vAPI.tabs.registerListeners
        if ( typeof vAPI.tabs.onClosed === 'function' ) {
            vAPI.tabs.onClosed(tabId);
        }

        delete vAPI.tabIcons[tabId];
        delete vAPI.tabs.stack[tabId];
    }
}, true);

/******************************************************************************/

// update badge when tab is activated
safari.application.addEventListener('activate', function(e) {
    // ignore windows
    if ( !(e.target instanceof SafariBrowserTab) ) {
        return;
    }

    // update the badge, when tab is selected
    vAPI.setIcon();
}, true);

/******************************************************************************/

// reload the popup when that is opened
safari.application.addEventListener('popover', function(e) {
    e.target.contentWindow.document.body.textContent = '';
    e.target.contentWindow.location.reload();
}, true);

/******************************************************************************/

vAPI.tabIcons = { /*tabId: {badge: 0, img: suffix}*/ };
vAPI.setIcon = function(tabId, iconStatus, badge) {
    var curTabId = vAPI.tabs.getTabId(
        safari.application.activeBrowserWindow.activeTab
    );

    // from 'activate' event
    if ( tabId === undefined ) {
        tabId = curTabId;
    } else {
        if ( badge && /\D/.test(badge) ) {
            badge = 999;
        }

        vAPI.tabIcons[tabId] = {
            badge: badge || 0,
            img: iconStatus === 'on' ? '' : '-off'
        };
    }

    if ( tabId !== curTabId ) {
        return;
    }

    // if the selected tab has the same ID, then update the badge too,
    // or always update it when changing tabs ('activate' event)
    var items = safari.extension.toolbarItems;
    var i = items.length;

    while ( i-- ) {
        if ( items[i].browserWindow === safari.application.activeBrowserWindow ) {
            var icon = vAPI.tabIcons[tabId];
            items[i].badge = icon && icon.badge || 0;
            // TODO: a disabled icon for Safari
            // items[i].img = vAPI.getURL(icon.img);
            return;
        }
    }
};

/******************************************************************************/

vAPI.messaging = {
    listeners: {},
    defaultHandler: null,
    NOOPFUNC: function(){},
    UNHANDLED: 'vAPI.messaging.notHandled'
};

/******************************************************************************/

vAPI.messaging.listen = function(listenerName, callback) {
    this.listeners[listenerName] = callback;
};

/******************************************************************************/

vAPI.messaging.onMessage = function(request) {
    var callback = vAPI.messaging.NOOPFUNC;
    if ( request.message.requestId !== undefined ) {
        callback = function(response) {
            request.target.page.dispatchMessage(
                request.name,
                {
                    requestId: request.message.requestId,
                    channelName: request.message.channelName,
                    msg: response !== undefined ? response : null
                }
            );
        };
    }

    var sender = {
        tab: {
            id: vAPI.tabs.getTabId(request.target)
        }
    };

    // Specific handler
    var r = vAPI.messaging.UNHANDLED;
    var listener = vAPI.messaging.listeners[request.message.channelName];
    if ( typeof listener === 'function' ) {
        r = listener(request.message.msg, sender, callback);
    }
    if ( r !== vAPI.messaging.UNHANDLED ) {
        return;
    }

    // Default handler
    r = vAPI.messaging.defaultHandler(request.message.msg, sender, callback);
    if ( r !== vAPI.messaging.UNHANDLED ) {
        return;
    }

    console.error('µBlock> messaging > unknown request: %o', request.message);

    // Unhandled:
    // Need to callback anyways in case caller expected an answer, or
    // else there is a memory leak on caller's side
    callback();
};

/******************************************************************************/

vAPI.messaging.setup = function(defaultHandler) {
    // Already setup?
    if ( this.defaultHandler !== null ) {
        return;
    }

    if ( typeof defaultHandler !== 'function' ) {
        defaultHandler = function(){ return vAPI.messaging.UNHANDLED; };
    }
    this.defaultHandler = defaultHandler;

    // the third parameter must stay false (bubbling), so later
    // onBeforeRequest will use true (capturing), where we can invoke
    // stopPropagation() (this way this.onMessage won't be fired)
    safari.application.addEventListener('message', this.onMessage, false);
};

/******************************************************************************/

vAPI.messaging.broadcast = function(message) {
    message = {
        broadcast: true,
        msg: message
    };

    for ( var tabId in vAPI.tabs.stack ) {
        vAPI.tabs.stack[tabId].page.dispatchMessage('broadcast', message);
    }
};

/******************************************************************************/

safari.application.addEventListener('beforeNavigate', function(e) {
    if ( !vAPI.tabs.popupCandidate || e.url === 'about:blank' ) {
        return;
    }

    var details = {
        url: e.url,
        tabId: vAPI.tabs.getTabId(e.target),
        sourceTabId: vAPI.tabs.popupCandidate
    };

    vAPI.tabs.popupCandidate = null;

    if ( vAPI.tabs.onPopup(details) ) {
        e.preventDefault();

        if ( vAPI.tabs.stack[details.sourceTabId] ) {
            vAPI.tabs.stack[details.sourceTabId].activate();
        }
    }
}, true);

/******************************************************************************/

vAPI.net = {};

/******************************************************************************/

vAPI.net.registerListeners = function() {
    // Since it's not used
    this.onBeforeSendHeaders = null;
    this.onHeadersReceived = null;

    var onBeforeRequest = this.onBeforeRequest;

    if ( !Array.isArray(onBeforeRequest.types) ) {
        onBeforeRequest.types = [];
    }

    onBeforeRequest = onBeforeRequest.callback;
    this.onBeforeRequest.callback = function(e) {
        var block;

        if ( e.name !== 'canLoad' ) {
            return;
        }

        // No stopPropagation if it was called from beforeNavigate event
        if ( e.stopPropagation ) {
            e.stopPropagation();
        }

        if ( e.message.isURLWhiteListed ) {
            block = µBlock.URI.hostnameFromURI(e.message.isURLWhiteListed);
            block = µBlock.URI.domainFromHostname(block) || block;
            e.message = !!µBlock.netWhitelist[block];
            return e.message;
        }

        // When the URL changes, but the document doesn't
        if ( e.message.type === 'popstate' ) {
            vAPI.tabs.onUpdated(
                vAPI.tabs.getTabId(e.target),
                {url: e.message.url},
                {url: e.message.url}
            );
            return;
        } else if ( e.message.type === 'popup' ) {
            // blocking unwanted pop-ups
            if ( e.message.url === 'about:blank' ) {
                vAPI.tabs.popupCandidate = vAPI.tabs.getTabId(e.target);
                e.message = true;
            } else {
                e.message = !vAPI.tabs.onPopup({
                    url: e.message.url,
                    tabId: 0,
                    sourceTabId: vAPI.tabs.getTabId(e.target)
                });
            }

            return;
        }

        block = vAPI.net.onBeforeRequest;

        if ( block.types.indexOf(e.message.type) === -1 ) {
            return true;
        }

        e.message.tabId = vAPI.tabs.getTabId(e.target);
        block = onBeforeRequest(e.message);

        // Truthy return value will allow the request,
        // except when redirectUrl is present
        if ( block && typeof block === 'object' ) {
            if ( block.cancel === true ) {
                e.message = false;
            } else if ( e.message.type === 'script'
                && typeof block.redirectUrl === 'string' ) {
                e.message = block.redirectUrl;
            } else {
                e.message = true;
            }
        } else {
            e.message = true;
        }

        return e.message;
    };

    safari.application.addEventListener(
        'message',
        this.onBeforeRequest.callback,
        true
    );
};

/******************************************************************************/

vAPI.contextMenu = {
    contextMap: {
        frame: 'insideFrame',
        link: 'linkHref',
        image: 'srcUrl',
        editable: 'editable'
    }
};

/******************************************************************************/

vAPI.contextMenu.create = function(details, callback) {
    var contexts = details.contexts;
    var menuItemId = details.id;
    var menuTitle = details.title;

    if ( Array.isArray(contexts) && contexts.length ) {
        contexts = contexts.indexOf('all') === -1 ? contexts : null;
    } else {
        // default in Chrome
        contexts = ['page'];
    }

    this.onContextMenu = function(e) {
        var uI = e.userInfo;

        if ( !uI || /^https?:\/\//i.test(uI.pageUrl) === false ) {
            return;
        }

        if ( contexts ) {
            var invalidContext = true;
            var ctxMap = vAPI.contextMenu.contextMap;

            for ( var i = 0; i < contexts.length; i++ ) {
                var ctx = contexts[i];

                if ( ctx === 'audio' || ctx === 'video' ) {
                    if ( uI[ctxMap['image']] && uI.tagName === ctx ) {
                        invalidContext = false;
                        break;
                    }
                } else if ( uI[ctxMap[ctx]] ) {
                    invalidContext = false;
                    break;
                } else if ( ctx === 'page' ) {
                    if ( !(uI.insideFrame || uI.linkHref
                        || uI.mediaType || uI.editable) ) {
                        invalidContext = false;
                        break;
                    }
                }
            }

            if ( invalidContext ) {
                return;
            }
        }

        e.contextMenu.appendContextMenuItem(menuItemId, menuTitle);
    };

    this.onContextMenuCmd = function(e) {
        if ( e.command === menuItemId ) {
            var tab = e.currentTarget.activeBrowserWindow.activeTab;
            e.userInfo.menuItemId = menuItemId;
            callback(e.userInfo, tab ? {
                id: vAPI.tabs.getTabId(tab),
                url: tab.url
            } : undefined);
        }
    };

    safari.application.addEventListener('contextmenu', this.onContextMenu);
    safari.application.addEventListener('command', this.onContextMenuCmd);
};

/******************************************************************************/

vAPI.contextMenu.remove = function() {
    safari.application.removeEventListener('contextmenu', this.onContextMenu);
    safari.application.removeEventListener('command', this.onContextMenuCmd);
    this.onContextMenu = null;
    this.onContextMenuCmd = null;
};

/******************************************************************************/

vAPI.lastError = function() {
    return null;
};

/******************************************************************************/

// This is called only once, when everything has been loaded in memory after
// the extension was launched. It can be used to inject content scripts
// in already opened web pages, to remove whatever nuisance could make it to
// the web pages before uBlock was ready.

vAPI.onLoadAllCompleted = function() {
};

/******************************************************************************/

vAPI.punycodeHostname = function(hostname) {
    return hostname;
};

vAPI.punycodeURL = function(url) {
    return url;
};

/******************************************************************************/

})();