var fs   = require('fs');

var PhantomScenario = function(_page, scenario, options) {
    this.scenario = scenario;
    this.page = _page;
    this.options = options;
    this.testcase = {};
    this.init();
};

PhantomScenario.prototype = {
    init: function() {
        var self = this;
        self.page.onConsoleMessage = function(msg, lineNum, sourceId) {
            console.log(sourceId + ":" + msg);
        };
        self.page.onInitialized = function() {
            self.page.evaluate(function() {
                document.addEventListener('DOMContentLoaded', function() {
                    window.callPhantom('DOMContentLoaded');
                }, false);
            });
        };
        self.page.onCallback = function(event) {
            if (event === 'DOMContentLoaded') {
                console.log(self.page.no + ": " + self.page.url);
                var strDate = new Date().getTime();
                fs.write(self.options.evidencedir + fs.separator + strDate + ".html", self.page.content, 'a');
                console.log("render start.");
                self.page.render(self.options.evidencedir + fs.separator + strDate + '_capture_' + self.page.no + '.png');
                console.log("render finish.");
                self.assert();
                self.page.no++;
                self.next();
            }
        };
        self.page.onPageCreated = function(newPage) {
            self.page.onCallback = function(){};
            newPage.no = page.no;
            var newScenario = self.scenario;
            self.scenario   = undefined;
            var newPhantomScenario = new PhantomScenario(newPage, newScenario, self.options);
            newPhantomScenario.testcase = self.testcase;
            self.testcase   = undefined;
        };
    },
    next: function() {
        this.exec();
    },
    exec: function() {
        this.testcase = this.scenario.shift();
        if (this.testcase !== undefined) {
            if (this.testcase.name !== undefined) {
                console.log(this.testcase.name);
            }
            if (this.testcase.evaluate !== undefined) {
                this.page.evaluate(this.testcase.evaluate);
            } else {
                this.testcase.operation(this.page);
            }
        } else {
            this.page.onCallback = function(){};
            console.log("finish.");
            phantom.exit();
        }
    },
    assert: function() {
        if (this.testcase.assert !== undefined) {
            if (!this.testcase.assert(this.page)) {
                console.log('assert error. at testcase ' + this.page.no);
                phantom.exit(1);
            }
        }
    },
    wait: function(waitFor) {
        console.log("wait");
        var start = new Date().getTime();
        var current = new Date().getTime();
        while (current < start + waitFor) {
            current = new Date().getTime();
        }
        console.log("wait end");
        return;
    }
};


exports.run = function(page, scenario, options) {
    new PhantomScenario(page, scenario, options).next();
};