<?php
/**
 * Admin Google Ads — Dedicated Setup & Management Page
 *
 * Provides a step-by-step admin page for Google Ads integration:
 *   Step 1: Connect Google Ads (OAuth)
 *   Step 2: Enter Customer ID and save
 *   Step 3: Create or select a conversion action
 *   Step 4: Test the connection
 *
 * @package TrueConversion
 */

// Prevent direct file access.
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Class FTCON_Admin_Google_Ads
 */
class FTCON_Admin_Google_Ads {

	/**
	 * Initialize the Google Ads admin page.
	 */
	public static function init() {
		add_action( 'admin_menu', array( __CLASS__, 'register_submenu' ) );
		add_action( 'admin_init', array( __CLASS__, 'handle_actions' ) );
		add_action( 'admin_init', array( 'FTCON_Google_Ads', 'init_oauth_state' ) );
	}

	/**
	 * Register the Google Ads Submenu
	 */
	public static function register_submenu() {
		add_submenu_page(
			'forge-trueconversion',
			__( 'Google Ads', 'forge-trueconversion' ),
			__( 'Google Ads', 'forge-trueconversion' ),
			'manage_options',
			'ftcon-google-ads',
			array( __CLASS__, 'render_page' )
		);
	}

	/**
	 * Handle Page Actions
	 *
	 * Processes OAuth callback, disconnect, save settings.
	 */
	public static function handle_actions() {
		if ( ! isset( $_GET['page'] ) || 'ftcon-google-ads' !== $_GET['page'] ) { // phpcs:ignore WordPress.Security.NonceVerification
			return;
		}

		if ( ! current_user_can( 'manage_options' ) ) {
			return;
		}

		$notice = get_transient( 'ftcon_gads_admin_notice' );
		if ( $notice ) {
			add_settings_error( 'ftcon_google_ads', 'oauth_notice', $notice['message'], $notice['type'] );
			delete_transient( 'ftcon_gads_admin_notice' );
		}
		// Handle OAuth callback (returning from relay server).
		if ( isset( $_GET['ftcon_gads_token'] ) ) { // phpcs:ignore WordPress.Security.NonceVerification
			$result = FTCON_Google_Ads::handle_callback();
			if ( is_wp_error( $result ) ) {
				add_settings_error( 'ftcon_google_ads', 'oauth_error', $result->get_error_message(), 'error' );
			} else {
				add_settings_error( 'ftcon_google_ads', 'oauth_success', __( 'Google Ads connected successfully! Now enter your Customer ID below.', 'forge-trueconversion' ), 'success' );
			}
			return;
		}

		// Handle OAuth error return.
		if ( isset( $_GET['error'] ) && isset( $_GET['state'] ) ) { // phpcs:ignore WordPress.Security.NonceVerification
			$error = sanitize_text_field( wp_unslash( $_GET['error'] ) ); // phpcs:ignore WordPress.Security.NonceVerification
			add_settings_error( 'ftcon_google_ads', 'oauth_error', $error, 'error' );
			return;
		}

		// Handle disconnect.
		if ( isset( $_POST['ftcon_gads_disconnect'] ) ) {
			check_admin_referer( 'ftcon_gads_disconnect' );
			FTCON_Google_Ads::disconnect();
			// Also clear customer ID and conversion action.
			update_option( 'ftcon_gads_customer_id', '' );
			update_option( 'ftcon_gads_conversion_action_id', '' );
			add_settings_error( 'ftcon_google_ads', 'disconnected', __( 'Google Ads disconnected.', 'forge-trueconversion' ), 'success' );
			return;
		}

		// Handle save customer ID.
		if ( isset( $_POST['ftcon_gads_save_customer_id'] ) ) {
			check_admin_referer( 'ftcon_gads_customer_id' );

			$customer_id = isset( $_POST['ftcon_gads_customer_id'] ) ? sanitize_text_field( wp_unslash( $_POST['ftcon_gads_customer_id'] ) ) : '';
			if ( empty( $customer_id ) ) {
				add_settings_error( 'ftcon_google_ads', 'saved', __( 'Empty Customer ID', 'forge-trueconversion' ), 'error' );
				return;
			}
			$customer_id = preg_replace( '/[^0-9\-]/', '', $customer_id );
			update_option( 'ftcon_gads_customer_id', $customer_id );
			add_settings_error( 'ftcon_google_ads', 'saved', __( 'Customer ID saved. Now create or select a conversion action below.', 'forge-trueconversion' ), 'success' );
			return;
		}

		// Handle save conversion action.
		if ( isset( $_POST['ftcon_gads_save_action'] ) ) {
			check_admin_referer( 'ftcon_gads_action' );

			$conversion_action = isset( $_POST['ftcon_gads_conversion_action_id'] ) ? sanitize_text_field( wp_unslash( $_POST['ftcon_gads_conversion_action_id'] ) ) : '';
			if ( empty( $conversion_action ) ) {
				add_settings_error( 'ftcon_google_ads', 'saved', __( 'Empty Conversion Action', 'forge-trueconversion' ), 'error' );
				return;
			}
			update_option( 'ftcon_gads_conversion_action_id', $conversion_action );

			add_settings_error( 'ftcon_google_ads', 'saved', __( 'Conversion action saved. You can now test the connection below.', 'forge-trueconversion' ), 'success' );
			return;
		}
	}

	private function ftcon_get_last_id( string $conversion_action ): string {
		return substr( $conversion_action, strrpos( $conversion_action, '/' ) + 1 );
	}

	/**
	 * Render the Google Ads Page
	 */
	public static function render_page() {
		if ( ! current_user_can( 'manage_options' ) ) {
			return;
		}

		$is_connected         = FTCON_Google_Ads::is_connected();
		$customer_id          = get_option( 'ftcon_gads_customer_id', '' );
		$conversion_action    = get_option( 'ftcon_gads_conversion_action_id', '' );
		$class_instance       = new self();
		$conversion_action_id = $class_instance->ftcon_get_last_id( $conversion_action );

		// Determine which step is active.
		$step_1_done = $is_connected;
		$step_2_done = $step_1_done && ! empty( $customer_id );
		$step_3_done = $step_2_done && ! empty( $conversion_action );

		?>
		<div class="wrap tc-gads-wrap">
			<h1><?php esc_html_e( 'Google Ads Integration', 'forge-trueconversion' ); ?></h1>
			<p class="tc-gads-subtitle"><?php esc_html_e( 'Connect your Google Ads account so TrueConversion can send real conversions back to Google.', 'forge-trueconversion' ); ?></p>

			<?php settings_errors( 'ftcon_google_ads' ); ?>

			<!-- ─── STEP 1: Connect Google Ads ─── -->
			<div class="tc-gads-step-card <?php echo $step_1_done ? 'tc-step-done' : 'tc-step-active'; ?>">
				<div class="tc-gads-step-header">
					<div class="tc-gads-step-number <?php echo $step_1_done ? 'tc-step-number-done' : ''; ?>">
						<?php echo $step_1_done ? '&#10003;' : '1'; ?>
					</div>
					<div class="tc-gads-step-title">
						<h2><?php esc_html_e( 'Connect Google Ads', 'forge-trueconversion' ); ?></h2>
						<?php if ( ! $step_1_done ) : ?>
							<p><?php esc_html_e( 'Authorise TrueConversion to access your Google Ads account.', 'forge-trueconversion' ); ?></p>
						<?php endif; ?>
					</div>
				</div>

				<div class="tc-gads-step-body">
					<?php if ( $is_connected ) : ?>
						<div class="tc-gads-inline-status">
							<span class="tc-gads-status tc-gads-connected">
								<span class="dashicons dashicons-yes-alt"></span>
								<?php esc_html_e( 'Connected', 'forge-trueconversion' ); ?>
							</span>
							<form method="post" style="display:inline;margin-left:12px;">
								<?php wp_nonce_field( 'ftcon_gads_disconnect' ); ?>
								<button type="submit" name="ftcon_gads_disconnect" class="button button-link-delete" onclick="return confirm('<?php echo esc_js( __( 'Are you sure? This will disconnect Google Ads and clear your settings.', 'forge-trueconversion' ) ); ?>');">
									<?php esc_html_e( 'Disconnect', 'forge-trueconversion' ); ?>
								</button>
							</form>
						</div>
					<?php else : ?>
						<a href="<?php echo esc_url( FTCON_Google_Ads::get_connect_url() ); ?>" class="button button-primary button-hero" id="tc-gads-connect-btn">
							<?php esc_html_e( 'Connect Google Ads', 'forge-trueconversion' ); ?>
						</a>
						<p class="description" style="margin-top:8px;">
							<?php esc_html_e( 'You will be redirected to Google to grant access. Your credentials are never stored on this site.', 'forge-trueconversion' ); ?>
						</p>
					<?php endif; ?>
				</div>
			</div>

			<!-- ─── STEP 2: Enter Customer ID ─── -->
			<div class="tc-gads-step-card <?php echo ! $step_1_done ? 'tc-step-locked' : ( $step_2_done ? 'tc-step-done' : 'tc-step-active' ); ?>">
				<div class="tc-gads-step-header">
					<div class="tc-gads-step-number <?php echo $step_2_done ? 'tc-step-number-done' : ''; ?>">
						<?php echo $step_2_done ? '&#10003;' : '2'; ?>
					</div>
					<div class="tc-gads-step-title">
						<h2><?php esc_html_e( 'Enter Your Customer ID', 'forge-trueconversion' ); ?></h2>
						<?php if ( ! $step_2_done && $step_1_done ) : ?>
							<p><?php esc_html_e( 'Find this in the top-right corner of your Google Ads account (e.g. 123-456-7890).', 'forge-trueconversion' ); ?></p>
						<?php endif; ?>
					</div>
				</div>

				<?php if ( $step_1_done ) : ?>
					<div class="tc-gads-step-body">
						<form method="post">
							<?php wp_nonce_field( 'ftcon_gads_customer_id' ); ?>
							<div style="display:flex;gap:8px;align-items:center;">
								<input type="text" id="ftcon_gads_customer_id" name="ftcon_gads_customer_id"
									value="<?php echo esc_attr( $customer_id ); ?>"
									class="regular-text" placeholder="123-456-7890" />
								<button type="submit" name="ftcon_gads_save_customer_id" class="button button-primary">
									<?php esc_html_e( 'Save Customer ID', 'forge-trueconversion' ); ?>
								</button>
							</div>
							<?php if ( $step_2_done ) : ?>
								<p class="description" style="margin-top:4px;color:#16a34a;">
									<span class="dashicons dashicons-yes" style="font-size:16px;width:16px;height:16px;"></span>
									<?php
									/* translators: %s: customer ID */
									printf( esc_html__( 'Saved: %s', 'forge-trueconversion' ), esc_html( $customer_id ) );
									?>
								</p>
							<?php endif; ?>
						</form>
					</div>
				<?php else : ?>
					<div class="tc-gads-step-body tc-gads-locked-message">
						<p><?php esc_html_e( 'Complete Step 1 first.', 'forge-trueconversion' ); ?></p>
					</div>
				<?php endif; ?>
			</div>

			<!-- ─── STEP 3: Create or Select Conversion Action ─── -->
			<div class="tc-gads-step-card <?php echo ! $step_2_done ? 'tc-step-locked' : ( $step_3_done ? 'tc-step-done' : 'tc-step-active' ); ?>">
				<div class="tc-gads-step-header">
					<div class="tc-gads-step-number <?php echo $step_3_done ? 'tc-step-number-done' : ''; ?>">
						<?php echo $step_3_done ? '&#10003;' : '3'; ?>
					</div>
					<div class="tc-gads-step-title">
						<h2><?php esc_html_e( 'Set Up Conversion Action', 'forge-trueconversion' ); ?></h2>
						<?php if ( ! $step_3_done && $step_2_done ) : ?>
							<p><?php esc_html_e( 'Create a new conversion action or select an existing one.', 'forge-trueconversion' ); ?></p>
						<?php endif; ?>
					</div>
				</div>

				<?php if ( $step_2_done ) : ?>
					<div class="tc-gads-step-body">
						<!-- Create New Action -->
						<div class="tc-gads-create-box">
							<h4><?php esc_html_e( 'Create a New Conversion Action (Recommended)', 'forge-trueconversion' ); ?></h4>
							<p><?php esc_html_e( 'TrueConversion will create an "Upload Clicks" conversion action in your Google Ads account automatically.', 'forge-trueconversion' ); ?></p>
							<div style="display:flex;gap:8px;align-items:center;">
								<input type="text" id="tc-gads-new-action-name" value="TrueConversion Lead" class="regular-text" placeholder="<?php esc_attr_e( 'Conversion action name', 'forge-trueconversion' ); ?>" />
								<button type="button" id="tc-gads-create-action" class="button button-primary">
									<?php esc_html_e( 'Create Action', 'forge-trueconversion' ); ?>
								</button>
								<span id="tc-gads-create-spinner" class="spinner" style="float:none;"></span>
							</div>
							<div id="tc-gads-create-result" style="margin-top:8px;"></div>
						</div>

						<div class="tc-gads-or-divider">
							<span><?php esc_html_e( 'OR', 'forge-trueconversion' ); ?></span>
						</div>

						<!-- Select Existing Action -->
						<div class="tc-gads-select-box">
							<h4><?php esc_html_e( 'Select an Existing Conversion Action', 'forge-trueconversion' ); ?></h4>
							<p><?php esc_html_e( 'If you already have an "Upload Clicks" conversion action in Google Ads, select it here.', 'forge-trueconversion' ); ?></p>
							<div style="display:flex;gap:8px;align-items:center;flex-wrap:wrap;">
					
								<select id="ftcon_gads_conversion_action_id" name="ftcon_gads_conversion_action_id" class="regular-text">
									<option value=""><?php esc_html_e( '— Select a conversion action —', 'forge-trueconversion' ); ?></option>
									<?php if ( ! empty( $conversion_action ) ) : ?>
										<option value="<?php echo esc_attr( $conversion_action ); ?>" selected>
											<?php
											printf(
												/* translators: %s: Google Ads conversion action ID */
												esc_html__( 'TrueConversion Lead (ID: %s)', 'forge-trueconversion' ),
												esc_html( $conversion_action_id )
											);
											?>
										</option>
									<?php endif; ?>
								</select>
								<button type="button" id="tc-gads-refresh-actions" class="button button-secondary">
									<?php esc_html_e( 'Refresh Actions', 'forge-trueconversion' ); ?>
								</button>
								<span id="tc-gads-actions-spinner" class="spinner" style="float:none;"></span>
							</div>
						</div>

						<!-- Save Conversion Action -->
						<form method="post" style="margin-top:16px;">
							<?php wp_nonce_field( 'ftcon_gads_action' ); ?>
							<input type="hidden" id="ftcon_gads_action_hidden" name="ftcon_gads_conversion_action_id" value="<?php echo esc_attr( $conversion_action ); ?>" />
							<button type="submit" name="ftcon_gads_save_action" class="button button-primary" id="tc-gads-save-action-btn">
								<?php esc_html_e( 'Save Conversion Action', 'forge-trueconversion' ); ?>
							</button>
						</form>

						<?php if ( $step_3_done ) : ?>
							<p class="description" style="margin-top:8px;color:#16a34a;">
								<span class="dashicons dashicons-yes" style="font-size:16px;width:16px;height:16px;"></span>
								<?php esc_html_e( 'Conversion action saved.', 'forge-trueconversion' ); ?>
							</p>
						<?php endif; ?>
					</div>
				<?php else : ?>
					<div class="tc-gads-step-body tc-gads-locked-message">
						<p><?php esc_html_e( 'Complete Step 2 first.', 'forge-trueconversion' ); ?></p>
					</div>
				<?php endif; ?>
			</div>

			<!-- ─── STEP 4: Test Connection ─── -->
			<div class="tc-gads-step-card <?php echo ! $step_3_done ? 'tc-step-locked' : 'tc-step-active'; ?>">
				<div class="tc-gads-step-header">
					<div class="tc-gads-step-number">4</div>
					<div class="tc-gads-step-title">
						<h2><?php esc_html_e( 'Test Connection', 'forge-trueconversion' ); ?></h2>
						<?php if ( $step_3_done ) : ?>
							<p><?php esc_html_e( 'Send a test conversion to verify everything is working.', 'forge-trueconversion' ); ?></p>
						<?php endif; ?>
					</div>
				</div>

				<?php if ( $step_3_done ) : ?>
					<div class="tc-gads-step-body">
						<button type="button" id="tc-gads-test-btn" class="button button-secondary">
							<?php esc_html_e( 'Send Test Conversion', 'forge-trueconversion' ); ?>
						</button>
						<span id="tc-gads-test-spinner" class="spinner" style="float:none;"></span>
						<div id="tc-gads-test-result" style="margin-top:10px;"></div>
						<p class="description" style="margin-top:8px;">
							<?php esc_html_e( 'This sends a dummy conversion to Google Ads. It may take a few hours to appear in your Google Ads reports.', 'forge-trueconversion' ); ?>
						</p>
					</div>
				<?php else : ?>
					<div class="tc-gads-step-body tc-gads-locked-message">
						<p><?php esc_html_e( 'Complete Steps 1–3 first.', 'forge-trueconversion' ); ?></p>
					</div>
				<?php endif; ?>
			</div>

			<?php if ( $step_3_done ) : ?>
				<!-- All Done -->
				<div class="tc-gads-done-banner">
					<span class="dashicons dashicons-yes-alt"></span>
					<div>
						<h3><?php esc_html_e( 'Google Ads is set up!', 'forge-trueconversion' ); ?></h3>
						<p><?php esc_html_e( 'When you mark a form submission as a conversion (manually or via AI), TrueConversion will automatically upload it to Google Ads.', 'forge-trueconversion' ); ?></p>
					</div>
				</div>

				<!-- ─── STEP 5: Configure Google Ads Campaigns ─── -->
				<div class="tc-gads-step-card tc-step-active" style="margin-top:16px;">
					<div class="tc-gads-step-header">
						<div class="tc-gads-step-number" style="background:#f59e0b;">5</div>
						<div class="tc-gads-step-title">
							<h2><?php esc_html_e( 'Important: Update Your Google Ads Campaigns', 'forge-trueconversion' ); ?></h2>
							<p><?php esc_html_e( 'Tell Google Ads to optimise for real leads instead of raw form submissions.', 'forge-trueconversion' ); ?></p>
						</div>
					</div>

					<div class="tc-gads-step-body">
						<div class="tc-gads-campaign-instructions">
							<p style="margin:0 0 12px;font-size:14px;">
								<?php esc_html_e( 'For TrueConversion to work properly, your Google Ads campaigns need to optimise for the "TrueConversion Lead" conversion action instead of your existing form submission tracking. This is usually a 5-minute job.', 'forge-trueconversion' ); ?>
							</p>

							<div class="tc-gads-instructions-box">
								<h4><?php esc_html_e( 'What needs to happen:', 'forge-trueconversion' ); ?></h4>
								<ol>
									<li><?php esc_html_e( 'In Google Ads, go to Goals > Conversions > Summary.', 'forge-trueconversion' ); ?></li>
									<li><?php esc_html_e( 'Find your existing form submission conversion action (e.g. "Submit Lead Form", "Contact Form", or similar).', 'forge-trueconversion' ); ?></li>
									<li><?php esc_html_e( 'Click on it, then click "Edit settings".', 'forge-trueconversion' ); ?></li>
									<li><?php esc_html_e( 'Change it from "Primary" to "Secondary". This keeps it tracking but stops Google optimising for it.', 'forge-trueconversion' ); ?></li>
									<li><?php esc_html_e( 'Now find "TrueConversion Lead" in the list and make sure it is set to "Primary".', 'forge-trueconversion' ); ?></li>
									<li><?php esc_html_e( 'If you also track phone calls as conversions, leave those as "Primary" too.', 'forge-trueconversion' ); ?></li>
								</ol>
								<p style="margin:12px 0 0;"><strong><?php esc_html_e( 'That\'s it!', 'forge-trueconversion' ); ?></strong> <?php esc_html_e( 'Google will now optimise your campaigns to find more people like your real customers, not just anyone who fills in a form.', 'forge-trueconversion' ); ?></p>
							</div>

							<div style="margin-top:16px;">
								<button type="button" id="tc-gads-copy-instructions" class="button button-secondary">
									<span class="dashicons dashicons-email-alt" style="vertical-align:middle;margin-top:-2px;"></span>
									<?php esc_html_e( 'Copy Instructions to Send to Your Ads Manager', 'forge-trueconversion' ); ?>
								</button>
								<span id="tc-gads-copy-success" style="display:none;color:#16a34a;margin-left:8px;font-weight:600;">
									<?php esc_html_e( 'Copied to clipboard!', 'forge-trueconversion' ); ?>
								</span>
							</div>
						</div>
					</div>
				</div>

				<!-- Hidden text for clipboard copy -->
				<textarea id="tc-gads-email-text" style="position:absolute;left:-9999px;" aria-hidden="true">
				<?php
					echo esc_textarea(
						"Hi,\n\n" .
						"We've installed TrueConversion on our website. It tracks which form submissions are genuine customer enquiries and sends only those back to Google Ads as conversions.\n\n" .
						"This means Google can optimise our campaigns to find more real customers instead of optimising for raw form submissions (which includes spam, sales pitches, job seekers, etc.).\n\n" .
						"To make this work, we need you to update our Google Ads conversion settings:\n\n" .
						"1. Go to Goals > Conversions > Summary.\n" .
						"2. Find our existing form submission conversion action (e.g. \"Submit Lead Form\", \"Contact Form\", or whatever it's currently called).\n" .
						"3. Click on it > Edit settings > Change it from \"Primary\" to \"Secondary\".\n   This keeps it tracking data but stops Google from optimising for it.\n" .
						"4. Find \"TrueConversion Lead\" in the conversion list and make sure it is set to \"Primary\".\n" .
						"5. If we also track phone calls as conversions, leave those as \"Primary\" too.\n\n" .
						"IMPORTANT: Don't delete the old form submission conversion action — just change it to Secondary. That way we keep the historical data.\n\n" .
						"Once this is done, Google Ads will start optimising to find more people like our actual customers. It may take a few weeks of data for Google to adjust, so the sooner this is done the better.\n\n" .
						'The Google Ads Customer ID this applies to is: ' . esc_html( $customer_id ) . "\n\n" .
						"Let me know if you have any questions.\n\n" .
						'Thanks!'
					);
				?>
				</textarea>
			<?php endif; ?>

		</div>

		<?php
	}
}

// Self-initialise.
FTCON_Admin_Google_Ads::init();