///
/// Keeps count of all instances with arguments, stores in global var
///
/// @access private
///
/// @param {String} $key                 - computed breakpoint of instance
/// @param {Number} $span                - computed span of instance
/// @param {Number} $context             - computed context of instance
/// @param {Number} $gutter              - computed gutter of instance
/// @param {Number} $output-width        - computed width of instance
/// @param {Number} $output-margin-right - computed right margin of instance
/// @param {Number} $output-margin-left  - computed left margin of instance
///
/// @return {Map} merged instance map
///
/// @group Internal Functions
///
@function flint-instance($key, $span, $context, $gutter, $output-width, $output-margin-right, $output-margin-left) {

    // Increase the instance count
    $flint-instance-count: $flint-instance-count + 1 !global;

    // Lets clean up the selector a bit...
    $selector: nth(&, 1);

		// Get the selector family instance
    $family-instance: flint-has-family-instance($key);

    $flint-instance: (
		"#{$selector}::#{$key}": (
			"instance-count": $flint-instance-count,
			"parent-selector": if($family-instance != false, $family-instance, none),
			"key": $key,
			"breakpoint": flint-get-value("breakpoints", $key, "breakpoint"),
			"columns": flint-get-value("breakpoints", $key, "columns"),
			"span": $span,
			"context": if($context == "auto", flint-get-instance-value($key, "span"), $context),
			"gutter": $gutter,
			"internal": (
				"width": $output-width,
				"margin-right": $output-margin-right,
				"margin-left": $output-margin-left
			)
		)
    );

    @return map-merge($flint-instance, $flint-instances);
}