/**
    Licensed to the Apache Software Foundation (ASF) under one
    or more contributor license agreements.  See the NOTICE file
    distributed with this work for additional information
    regarding copyright ownership.  The ASF licenses this file
    to you under the Apache License, Version 2.0 (the
    "License"); you may not use this file except in compliance
    with the License.  You may obtain a copy of the License at

        http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing,
    software distributed under the License is distributed on an
    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    KIND, either express or implied.  See the License for the
    specific language governing permissions and limitations
    under the License.
*/

const modulemapper = require('cordova/modulemapper');

let browserWrap, popup, navigationButtonsDiv, navigationButtonsDivInner, backButton, forwardButton, closeButton;

function attachNavigationEvents (element, callback) {
    const onError = function () {
        try {
            callback({ type: 'loaderror', url: this.contentWindow.location.href }, { keepCallback: true });
        } catch (err) {
            // blocked by CORS :\
            callback({ type: 'loaderror', url: null }, { keepCallback: true });
        }
    };

    element.addEventListener('pageshow', function () {
        try {
            callback({ type: 'loadstart', url: this.contentWindow.location.href }, { keepCallback: true });
        } catch (err) {
            // blocked by CORS :\
            callback({ type: 'loadstart', url: null }, { keepCallback: true });
        }
    });

    element.addEventListener('load', function () {
        try {
            callback({ type: 'loadstop', url: this.contentWindow.location.href }, { keepCallback: true });
        } catch (err) {
            // blocked by CORS :\
            callback({ type: 'loadstop', url: null }, { keepCallback: true });
        }
    });

    element.addEventListener('error', onError);
    element.addEventListener('abort', onError);
}

const IAB = {
    close: function (win, lose) {
        if (browserWrap) {
            // use the "open" function callback so that the exit event is fired properly
            if (IAB._win) IAB._win({ type: 'exit' });

            browserWrap.parentNode.removeChild(browserWrap);
            browserWrap = null;
            popup = null;
        }
    },

    show: function (win, lose) {
        if (browserWrap) {
            browserWrap.style.display = 'block';
        }
    },

    open: function (win, lose, args) {
        const strUrl = args[0];
        const target = args[1];
        const features = args[2];

        IAB._win = win;

        if (target === '_self' || !target) {
            window.location = strUrl;
        } else if (target === '_system') {
            modulemapper.getOriginalSymbol(window, 'window.open').call(window, strUrl, '_blank');
        } else {
            // "_blank" or anything else
            if (!browserWrap) {
                browserWrap = document.createElement('div');
                browserWrap.style.position = 'absolute';
                browserWrap.style.top = '0';
                browserWrap.style.left = '0';
                browserWrap.style.boxSizing = 'border-box';
                browserWrap.style.borderWidth = '40px';
                browserWrap.style.width = '100vw';
                browserWrap.style.height = '100vh';
                browserWrap.style.borderStyle = 'solid';
                browserWrap.style.borderColor = 'rgba(0,0,0,0.25)';

                browserWrap.onclick = function () {
                    setTimeout(function () {
                        IAB.close();
                    }, 0);
                };

                document.body.appendChild(browserWrap);
            }

            if (features.indexOf('hidden=yes') !== -1) {
                browserWrap.style.display = 'none';
            }

            popup = document.createElement('iframe');
            popup.style.borderWidth = '0px';
            popup.style.width = '100%';

            browserWrap.appendChild(popup);

            if (features.indexOf('location=yes') !== -1 || features.indexOf('location') === -1) {
                popup.style.height = 'calc(100% - 60px)';
                popup.style.marginBottom = '-4px';

                navigationButtonsDiv = document.createElement('div');
                navigationButtonsDiv.style.height = '60px';
                navigationButtonsDiv.style.backgroundColor = '#404040';
                navigationButtonsDiv.style.zIndex = '999';
                navigationButtonsDiv.onclick = function (e) {
                    e.cancelBubble = true;
                };

                navigationButtonsDivInner = document.createElement('div');
                navigationButtonsDivInner.style.paddingTop = '10px';
                navigationButtonsDivInner.style.height = '50px';
                navigationButtonsDivInner.style.width = '160px';
                navigationButtonsDivInner.style.margin = '0 auto';
                navigationButtonsDivInner.style.backgroundColor = '#404040';
                navigationButtonsDivInner.style.zIndex = '999';
                navigationButtonsDivInner.onclick = function (e) {
                    e.cancelBubble = true;
                };

                backButton = document.createElement('button');
                backButton.style.width = '40px';
                backButton.style.height = '40px';
                backButton.style.borderRadius = '40px';

                backButton.innerHTML = '←';
                backButton.addEventListener('click', function (e) {
                    if (popup.canGoBack) {
                        popup.goBack();
                    }
                });

                forwardButton = document.createElement('button');
                forwardButton.style.marginLeft = '20px';
                forwardButton.style.width = '40px';
                forwardButton.style.height = '40px';
                forwardButton.style.borderRadius = '40px';

                forwardButton.innerHTML = '→';
                forwardButton.addEventListener('click', function (e) {
                    if (popup.canGoForward) {
                        popup.goForward();
                    }
                });

                closeButton = document.createElement('button');
                closeButton.style.marginLeft = '20px';
                closeButton.style.width = '40px';
                closeButton.style.height = '40px';
                closeButton.style.borderRadius = '40px';

                closeButton.innerHTML = '✖';
                closeButton.addEventListener('click', function (e) {
                    setTimeout(function () {
                        IAB.close();
                    }, 0);
                });

                // iframe navigation is not yet supported
                backButton.disabled = true;
                forwardButton.disabled = true;

                navigationButtonsDivInner.appendChild(backButton);
                navigationButtonsDivInner.appendChild(forwardButton);
                navigationButtonsDivInner.appendChild(closeButton);
                navigationButtonsDiv.appendChild(navigationButtonsDivInner);

                browserWrap.appendChild(navigationButtonsDiv);
            } else {
                popup.style.height = '100%';
            }

            // start listening for navigation events
            attachNavigationEvents(popup, win);

            popup.src = strUrl;
        }
    },

    injectScriptCode: function (win, fail, args) {
        const code = args[0];
        const hasCallback = args[1];

        if (browserWrap && popup) {
            try {
                popup.contentWindow.eval(code);
                if (hasCallback) {
                    win([]);
                }
            } catch (e) {
                console.error('Error occured while trying to injectScriptCode: ' + JSON.stringify(e));
            }
        }
    },

    injectScriptFile: function (win, fail, args) {
        const msg = 'Browser cordova-plugin-inappbrowser injectScriptFile is not yet implemented';
        console.warn(msg);
        if (fail) {
            fail(msg);
        }
    },

    injectStyleCode: function (win, fail, args) {
        const msg = 'Browser cordova-plugin-inappbrowser injectStyleCode is not yet implemented';
        console.warn(msg);
        if (fail) {
            fail(msg);
        }
    },

    injectStyleFile: function (win, fail, args) {
        const msg = 'Browser cordova-plugin-inappbrowser injectStyleFile is not yet implemented';
        console.warn(msg);
        if (fail) {
            fail(msg);
        }
    }
};

module.exports = IAB;

require('cordova/exec/proxy').add('InAppBrowser', module.exports);
