$args Field definition from settings fields.
*/
public static function render( string $id, string $value, array $args ): void {
$capability = $args['capability'] ?? 'text→text';
$display_name = '' !== $value ? $value : __( '— Select a model —', 'prautoblogger' );
$display_price = '';
if ( 'image_generation' === $capability ) {
// Resolve from the static image model list defined in settings.
$image_models = PRAutoBlogger_Settings_Fields_Extended::get_image_models();
foreach ( $image_models as $im ) {
if ( ( $im['id'] ?? '' ) === $value ) {
$display_name = $im['name'] ?? $value;
$display_price = '$' . number_format( (float) ( $im['cost_per_image'] ?? 0 ), 4 ) . '/image';
break;
}
}
} else {
// Resolve from the OpenRouter model registry cache.
$registry = prautoblogger()->get_executor()->get_model_registry();
$model = $registry->find_model( $value );
if ( null !== $model ) {
$display_name = $model['name'] ?? $value;
$in = (float) ( $model['input_price_per_m'] ?? 0 );
$out = (float) ( $model['output_price_per_m'] ?? 0 );
$display_price = self::format_price( $in ) . ' / ' . self::format_price( $out );
}
}
// Hidden input carries the actual value for the form submission.
printf(
'',
esc_attr( $id ),
esc_attr( $id ),
esc_attr( $value )
);
// Trigger button — opens the model picker popup via JS.
printf(
'',
esc_attr( $id ),
esc_attr( $capability ),
esc_html( $display_name ),
esc_html( $display_price )
);
// Cost preview panel — only for text→text models (not image).
if ( 'image_generation' !== $capability && '' !== $value ) {
$cost_preview = self::get_cost_preview( $id, $value );
if ( $cost_preview ) {
printf(
'%s
',
wp_kses_post( $cost_preview )
);
}
}
}
/**
* Calculate and render the estimated cost preview for a model + setting combo.
*
* @param string $field_id Setting ID (e.g. 'prautoblogger_writing_model').
* @param string $model_id Model ID (e.g. 'anthropic/claude-3.5-haiku').
*
* @return string HTML snippet for the cost preview, or empty if no history.
*/
private static function get_cost_preview( string $field_id, string $model_id ): string {
$stages = self::get_stages_for_setting( $field_id );
if ( empty( $stages ) ) {
return '';
}
$registry = prautoblogger()->get_executor()->get_model_registry();
$model = $registry->find_model( $model_id );
if ( null === $model ) {
return '';
}
$tracker = new PRAutoBlogger_Cost_Tracker();
$tokens = $tracker->get_avg_tokens_for_stages( $stages, 30 );
if ( 0 === $tokens['sample_size'] ) {
return '' . esc_html__( 'Estimated cost: — (insufficient history)', 'prautoblogger' ) . '';
}
$in_price = (float) ( $model['input_price_per_m'] ?? 0 );
$out_price = (float) ( $model['output_price_per_m'] ?? 0 );
$avg_tokens_in = $tokens['avg_prompt_tokens'];
$avg_tokens_out = $tokens['avg_completion_tokens'];
// Cost per generation = (avg_in_tokens × in_price + avg_out_tokens × out_price) / 1_000_000
$cost_per_gen = ( ( $avg_tokens_in * $in_price ) + ( $avg_tokens_out * $out_price ) ) / 1_000_000;
return sprintf(
'%s %s',
esc_html__( 'Estimated cost per generation:', 'prautoblogger' ),
esc_html( '$' . number_format( $cost_per_gen, 4 ) )
);
}
/**
* Map a setting ID to its constituent pipeline stages.
*
* @param string $field_id Setting ID.
*
* @return string[] Stage names, e.g. ['outline', 'draft', 'polish'] for writing model.
*/
private static function get_stages_for_setting( string $field_id ): array {
$map = [
'prautoblogger_analysis_model' => [ 'analysis' ],
'prautoblogger_writing_model' => [ 'outline', 'draft', 'polish' ],
'prautoblogger_editor_model' => [ 'review' ],
];
return $map[ $field_id ] ?? [];
}
/**
* Format a price-per-million-tokens value for display.
*
* @param float $price Price per 1M tokens.
* @return string Formatted price string like "$0.25" or "Free".
*/
private static function format_price( float $price ): string {
if ( $price <= 0 ) {
return __( 'Free', 'prautoblogger' );
}
if ( $price < 0.01 ) {
return '$' . number_format( $price, 4 );
}
return '$' . number_format( $price, 2 );
}
}