/*globals describe, before, beforeEach, afterEach, it*/
var testUtils = require('../utils'),
    should = require('should'),
    sinon = require('sinon'),
    when = require('when'),
    path = require('path'),
    _ = require('underscore'),

    // Stuff we are testing
    Ghost = require('../../ghost');

describe("Ghost API", function () {
    var testTemplatePath = 'core/test/utils/fixtures/',
        themeTemplatePath = 'core/test/utils/fixtures/theme',
        sandbox,
        ghost;

    before(function (done) {
        testUtils.clearData().then(function () {
            done();
        }, done);
    });

    beforeEach(function (done) {
        sandbox = sinon.sandbox.create();

        testUtils.initData().then(function () {
            ghost = new Ghost();
            done();
        }, done);
    });

    afterEach(function () {
        sandbox.restore();
    });

    it("is a singleton", function () {
        var ghost2 = new Ghost();

        should.strictEqual(ghost, ghost2);
    });

    it("uses init() to initialize", function (done) {
        var dataProviderInitMock = sandbox.stub(ghost.dataProvider, "init", function () {
            return when.resolve();
        });

        should.not.exist(ghost.settings());

        ghost.init().then(function () {

            should.exist(ghost.settings());

            dataProviderInitMock.called.should.equal(true);

            done();
        }, done);

    });

    it("can register filters with specific priority", function () {
        var filterName = 'test',
            filterPriority = 9,
            testFilterHandler = sandbox.spy();

        ghost.registerFilter(filterName, filterPriority, testFilterHandler);

        should.exist(ghost.filterCallbacks[filterName]);
        should.exist(ghost.filterCallbacks[filterName][filterPriority]);

        ghost.filterCallbacks[filterName][filterPriority].should.include(testFilterHandler);
    });

    it("can register filters with default priority", function () {
        var filterName = 'test',
            defaultPriority = 5,
            testFilterHandler = sandbox.spy();

        ghost.registerFilter(filterName, testFilterHandler);

        should.exist(ghost.filterCallbacks[filterName]);
        should.exist(ghost.filterCallbacks[filterName][defaultPriority]);

        ghost.filterCallbacks[filterName][defaultPriority].should.include(testFilterHandler);
    });

    it("executes filters in priority order", function (done) {
        var filterName = 'testpriority',
            testFilterHandler1 = sandbox.spy(),
            testFilterHandler2 = sandbox.spy(),
            testFilterHandler3 = sandbox.spy();

        ghost.registerFilter(filterName, 0, testFilterHandler1);
        ghost.registerFilter(filterName, 2, testFilterHandler2);
        ghost.registerFilter(filterName, 9, testFilterHandler3);

        ghost.doFilter(filterName, null).then(function () {

            testFilterHandler1.calledBefore(testFilterHandler2).should.equal(true);
            testFilterHandler2.calledBefore(testFilterHandler3).should.equal(true);

            testFilterHandler3.called.should.equal(true);

            done();
        });
    });

    it("executes filters that return a promise", function (done) {
        var filterName = 'testprioritypromise',
            testFilterHandler1 = sinon.spy(function (args) {
                return when.promise(function (resolve) {
                    process.nextTick(function () {
                        args.filter1 = true;

                        resolve(args);
                    });
                });
            }),
            testFilterHandler2 = sinon.spy(function (args) {
                args.filter2 = true;

                return args;
            }),
            testFilterHandler3 = sinon.spy(function (args) {
                return when.promise(function (resolve) {
                    process.nextTick(function () {
                        args.filter3 = true;

                        resolve(args);
                    });
                });
            });

        ghost.registerFilter(filterName, 0, testFilterHandler1);
        ghost.registerFilter(filterName, 2, testFilterHandler2);
        ghost.registerFilter(filterName, 9, testFilterHandler3);

        ghost.doFilter(filterName, { test: true }).then(function (newArgs) {

            testFilterHandler1.calledBefore(testFilterHandler2).should.equal(true);
            testFilterHandler2.calledBefore(testFilterHandler3).should.equal(true);

            testFilterHandler3.called.should.equal(true);

            newArgs.filter1.should.equal(true);
            newArgs.filter2.should.equal(true);
            newArgs.filter3.should.equal(true);

            done();
        });
    });

    it("can compile a template", function (done) {
        var template = path.join(process.cwd(), testTemplatePath, 'test.hbs');

        should.exist(ghost.compileTemplate, 'Template Compiler exists');

        ghost.compileTemplate(template).then(function (templateFn) {
            should.exist(templateFn);
            _.isFunction(templateFn).should.equal(true);

            templateFn().should.equal('<h1>HelloWorld</h1>');
            done();
        }).then(null, done);
    });

    it("loads templates for helpers", function (done) {
        var compileSpy = sandbox.spy(ghost, 'compileTemplate'),
            pathsStub;

        should.exist(ghost.loadTemplate, 'load template function exists');

        // In order for the test to work, need to replace the path to the template
        pathsStub = sandbox.stub(ghost, "paths", function () {
            return {
                // Forcing the theme path to be the same
                activeTheme: path.join(process.cwd(), testTemplatePath),
                helperTemplates: path.join(process.cwd(), testTemplatePath)
            };
        });

        ghost.loadTemplate('test').then(function (templateFn) {
            compileSpy.restore();
            pathsStub.restore();

            // test that compileTemplate was called with the expected path
            compileSpy.calledOnce.should.equal(true);
            compileSpy.calledWith(path.join(process.cwd(), testTemplatePath, 'test.hbs')).should.equal(true);

            should.exist(templateFn);
            _.isFunction(templateFn).should.equal(true);

            templateFn().should.equal('<h1>HelloWorld</h1>');

            done();
        }).then(null, done);
    });

    it("loads templates from themes first", function (done) {
        var compileSpy = sandbox.spy(ghost, 'compileTemplate'),
            pathsStub;

        should.exist(ghost.loadTemplate, 'load template function exists');

        // In order for the test to work, need to replace the path to the template
        pathsStub = sandbox.stub(ghost, "paths", function () {
            return {
                activeTheme: path.join(process.cwd(), themeTemplatePath),
                helperTemplates: path.join(process.cwd(), testTemplatePath)
            };
        });

        ghost.loadTemplate('test').then(function (templateFn) {
            // test that compileTemplate was called with the expected path
            compileSpy.calledOnce.should.equal(true);
            compileSpy.calledWith(path.join(process.cwd(), themeTemplatePath, 'partials', 'test.hbs')).should.equal(true);

            should.exist(templateFn);
            _.isFunction(templateFn).should.equal(true);

            templateFn().should.equal('<h1>HelloWorld Themed</h1>');

            compileSpy.restore();
            pathsStub.restore();

            done();
        }).then(null, done);
    });
});