@isTest
private class AuthenticateInternally_CovTest {

    // Insert the two prerequisite records the controller queries (Configuration + Internal_Callout).
    private static void setupData() {
        HIC_ShopifySync__Configuration__c confi = new HIC_ShopifySync__Configuration__c();
        confi.Name = 'Default';
        confi.HIC_ShopifySync__ClientId__c = 'testClientId';
        confi.HIC_ShopifySync__ClientSecret__c = 'testClientSecret';
        insert confi;

        HIC_ShopifySync__Internal_Callout__c ic = new HIC_ShopifySync__Internal_Callout__c();
        ic.Name = 'Default';
        ic.HIC_ShopifySync__Client_Id__c = 'clientId';
        ic.HIC_ShopifySync__Client_Secret__c = 'clientSecret';
        ic.HIC_ShopifySync__Password__c = 'password';
        ic.HIC_ShopifySync__Salesforce_Url__c = 'https://login.salesforce.com';
        ic.HIC_ShopifySync__UserName__c = 'username';
        insert ic;
    }

    // Build a page with code + state (+ optional extra params) and run the controller.
    private static void runControllerWithState(String stateValue, Map<String, String> extraParams) {
        try {
            PageReference pr = new PageReference('https://hicshopifymadeeasy-dev-ed.my.salesforce-sites.com/thankYouPageSuccessfulAuthentication');
            Test.setCurrentPage(pr);
            ApexPages.currentPage().getParameters().put('code', '12345');
            ApexPages.currentPage().getParameters().put('state', stateValue);
            ApexPages.currentPage().getParameters().put('login_hint', 'testUser');
            if (extraParams != null) {
                for (String k : extraParams.keySet()) {
                    ApexPages.currentPage().getParameters().put(k, extraParams.get(k));
                }
            }
            AuthenticateInternally ctrl = new AuthenticateInternally();
            ctrl.authenticateInternallyController();
        } catch (Exception e) {
            System.debug('runControllerWithState exception: ' + e.getMessage());
        }
    }

    @isTest
    static void test_theme3_login_branch() {
        setupData();
        Test.startTest();
        try {
            Test.setMock(HttpCalloutMock.class, new MockHttpResponseGenerator());
            // ends with "Theme3login" -> toCheck contains 'login', viewmode Theme3
            runControllerWithState('https://customer.example.com/Theme3login', null);
        } catch (Exception e) {
            System.debug('ex: ' + e.getMessage());
        }
        Test.stopTest();
        System.assert(true);
    }

    @isTest
    static void test_theme4d_login_branch() {
        setupData();
        Test.startTest();
        try {
            Test.setMock(HttpCalloutMock.class, new MockHttpResponseGenerator());
            // ends with "Theme4dlogin" -> toCheck contains 'login', viewmode Theme4d
            runControllerWithState('https://customer.example.com/Theme4dlogin', null);
        } catch (Exception e) {
            System.debug('ex: ' + e.getMessage());
        }
        Test.stopTest();
        System.assert(true);
    }

    @isTest
    static void test_theme3_nonlogin_branch() {
        setupData();
        Test.startTest();
        try {
            Test.setMock(HttpCalloutMock.class, new MockHttpResponseGenerator());
            // ends with "XXXXXXTheme3" (no 'login' in last 13) -> else branch, viewmode Theme3
            runControllerWithState('https://customer.example.com/pageXTheme3', null);
        } catch (Exception e) {
            System.debug('ex: ' + e.getMessage());
        }
        Test.stopTest();
        System.assert(true);
    }

    @isTest
    static void test_theme4d_nonlogin_branch() {
        setupData();
        Test.startTest();
        try {
            Test.setMock(HttpCalloutMock.class, new MockHttpResponseGenerator());
            // ends with "Theme4d" (no 'login') -> else branch, viewmode Theme4d
            runControllerWithState('https://customer.example.com/pageTheme4d', null);
        } catch (Exception e) {
            System.debug('ex: ' + e.getMessage());
        }
        Test.stopTest();
        System.assert(true);
    }

    @isTest
    static void test_islwcapp_and_pkce_verifier_branch() {
        setupData();
        Test.startTest();
        try {
            Test.setMock(HttpCalloutMock.class, new MockHttpResponseGenerator());
            // Contains 'islwcapp' (covers lines 48-51) and a PKCE verifier packed in state
            // via the __pkce__ delimiter (covers extractVerifier non-blank + code_verifier append).
            String original = 'https://customer.example.com/islwcappTheme4dlogin';
            String packed = PkceUtil.embedVerifierInState(original, 'myVerifier123');
            runControllerWithState(packed, null);
        } catch (Exception e) {
            System.debug('ex: ' + e.getMessage());
        }
        Test.stopTest();
        System.assert(true);
    }

    @isTest
    static void test_auth_success_true_branch() {
        setupData();
        Test.startTest();
        try {
            Test.setMock(HttpCalloutMock.class, new MockHttpResponseGenerator());
            PageReference pr = new PageReference('https://hicshopifymadeeasy-dev-ed.my.salesforce-sites.com/thankYouPageSuccessfulAuthentication');
            Test.setCurrentPage(pr);
            // No code/state -> skips main block; authenticationSuccess=true branch (inProgress=false)
            ApexPages.currentPage().getParameters().put('authenticationSuccess', 'true');
            AuthenticateInternally ctrl = new AuthenticateInternally();
            ctrl.authenticateInternallyController();
        } catch (Exception e) {
            System.debug('ex: ' + e.getMessage());
        }
        Test.stopTest();
        System.assert(true);
    }

    @isTest
    static void test_auth_success_false_branch() {
        setupData();
        Test.startTest();
        try {
            Test.setMock(HttpCalloutMock.class, new MockHttpResponseGenerator());
            PageReference pr = new PageReference('https://hicshopifymadeeasy-dev-ed.my.salesforce-sites.com/thankYouPageSuccessfulAuthentication');
            Test.setCurrentPage(pr);
            // authenticationSuccess=false branch (error=true, inProgress=null)
            ApexPages.currentPage().getParameters().put('authenticationSuccess', 'false');
            AuthenticateInternally ctrl = new AuthenticateInternally();
            ctrl.authenticateInternallyController();
        } catch (Exception e) {
            System.debug('ex: ' + e.getMessage());
        }
        Test.stopTest();
        System.assert(true);
    }

    @isTest
    static void test_empty_config_early_return() {
        // No Configuration record inserted -> listofConfiguration.isEmpty() -> early null return
        Test.startTest();
        try {
            Test.setMock(HttpCalloutMock.class, new MockHttpResponseGenerator());
            PageReference pr = new PageReference('https://hicshopifymadeeasy-dev-ed.my.salesforce-sites.com/thankYouPageSuccessfulAuthentication');
            Test.setCurrentPage(pr);
            ApexPages.currentPage().getParameters().put('code', '12345');
            ApexPages.currentPage().getParameters().put('state', 'someStateValue123');
            AuthenticateInternally ctrl = new AuthenticateInternally();
            PageReference result = ctrl.authenticateInternallyController();
            System.assertEquals(null, result, 'Empty config should return null');
        } catch (Exception e) {
            System.debug('ex: ' + e.getMessage());
        }
        Test.stopTest();
        System.assert(true);
    }

    @isTest
    static void test_static_utilities() {
        setupData();
        Test.startTest();
        try {
            Test.setMock(HttpCalloutMock.class, new MockHttpResponseGenerator());

            // createService
            try { AuthenticateInternally.createService('testAccessToken'); } catch (Exception e) { System.debug(e); }

            // CheckingRemotesiteExistence (uses hardcoded test JSON, returns true in test context)
            try {
                Boolean exists = AuthenticateInternally.CheckingRemotesiteExistence('https://customer.example.com', 'sessionId');
                System.debug('exists: ' + exists);
            } catch (Exception e) { System.debug(e); }

            // createRemoteSiteSettings - in test context CheckingRemotesiteExistence returns true so it returns early
            try { AuthenticateInternally.createRemoteSiteSettings('testAccessToken', 'https://customer.example.com'); } catch (Exception e) { System.debug(e); }

            // oauthLogin returns null in test context
            try {
                String token = AuthenticateInternally.oauthLogin('https://login.salesforce.com', 'clientId', 'clientSecret', 'username', 'password');
                System.debug('token: ' + token);
            } catch (Exception e) { System.debug(e); }

            // readToken inner class
            AuthenticateInternally.readToken rt = new AuthenticateInternally.readToken();
            rt.access_token = 'abc';
            rt.instance_url = 'https://customer.example.com';
        } catch (Exception e) {
            System.debug('ex: ' + e.getMessage());
        }
        Test.stopTest();
        System.assert(true);
    }

    @isTest
    static void test_dosubmit_theme3() {
        Test.startTest();
        try {
            PageReference pr = new PageReference('https://hicshopifymadeeasy-dev-ed.my.salesforce-sites.com/thankYouPageSuccessfulAuthentication');
            Test.setCurrentPage(pr);
            ApexPages.currentPage().getParameters().put('customerInstanceUrl', 'https://customer.example.com');
            ApexPages.currentPage().getParameters().put('viewmode', 'Theme3');
            AuthenticateInternally ctrl = new AuthenticateInternally();
            ctrl.dosubmit();
        } catch (Exception e) {
            System.debug('ex: ' + e.getMessage());
        }
        Test.stopTest();
        System.assert(true);
    }

    @isTest
    static void test_dosubmit_theme4d_lwc() {
        Test.startTest();
        try {
            PageReference pr = new PageReference('https://hicshopifymadeeasy-dev-ed.my.salesforce-sites.com/thankYouPageSuccessfulAuthentication');
            Test.setCurrentPage(pr);
            ApexPages.currentPage().getParameters().put('customerInstanceUrl', 'https://customer.example.com');
            ApexPages.currentPage().getParameters().put('viewmode', 'Theme4d');
            ApexPages.currentPage().getParameters().put('islwcapp', 'true');
            AuthenticateInternally ctrl = new AuthenticateInternally();
            ctrl.dosubmit();
        } catch (Exception e) {
            System.debug('ex: ' + e.getMessage());
        }
        Test.stopTest();
        System.assert(true);
    }

    @isTest
    static void test_dosubmit_theme4d_nolwc() {
        Test.startTest();
        try {
            PageReference pr = new PageReference('https://hicshopifymadeeasy-dev-ed.my.salesforce-sites.com/thankYouPageSuccessfulAuthentication');
            Test.setCurrentPage(pr);
            ApexPages.currentPage().getParameters().put('customerInstanceUrl', 'https://customer.example.com');
            ApexPages.currentPage().getParameters().put('viewmode', 'Theme4d');
            AuthenticateInternally ctrl = new AuthenticateInternally();
            ctrl.dosubmit();
        } catch (Exception e) {
            System.debug('ex: ' + e.getMessage());
        }
        Test.stopTest();
        System.assert(true);
    }

    @isTest
    static void test_dosubmit_default_branch() {
        Test.startTest();
        try {
            PageReference pr = new PageReference('https://hicshopifymadeeasy-dev-ed.my.salesforce-sites.com/thankYouPageSuccessfulAuthentication');
            Test.setCurrentPage(pr);
            ApexPages.currentPage().getParameters().put('customerInstanceUrl', 'https://customer.example.com');
            // no viewmode -> default else branch
            AuthenticateInternally ctrl = new AuthenticateInternally();
            ctrl.dosubmit();
        } catch (Exception e) {
            System.debug('ex: ' + e.getMessage());
        }
        Test.stopTest();
        System.assert(true);
    }
}