<?php
/**
 * Monitor history panel (Overview tab): range tabs, KPIs, status bars, latency sparkline, incidents.
 * Data comes from GET /api/wp/monitors/{id}/history and is cached in a transient for 5 minutes.
 * Plan gating is enforced by mcpserverstatus.com; locked features arrive in `locked` and render as placeholders.
 *
 * @package MCPServerStatus
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Valid range ids.
 *
 * @return array
 */
function mcpss_history_ranges() {
	return array(
		'24h' => __( '24 hours', 'mcp-server-status' ),
		'7d'  => __( '7 days', 'mcp-server-status' ),
		'30d' => __( '30 days', 'mcp-server-status' ),
		'90d' => __( '90 days', 'mcp-server-status' ),
		'1y'  => __( '1 year', 'mcp-server-status' ),
	);
}

/**
 * Transient key for a monitor/range.
 *
 * @param string $id    Monitor id.
 * @param string $range Range.
 * @return string
 */
function mcpss_history_key( $id, $range ) {
	return 'mcpss_h_' . md5( $id . '|' . $range );
}

/**
 * Delete cached history for the given monitors.
 *
 * @param array $monitors Monitors.
 */
function mcpss_flush_history( $monitors ) {
	foreach ( (array) $monitors as $m ) {
		if ( empty( $m['id'] ) ) {
			continue;
		}
		foreach ( array_keys( mcpss_history_ranges() ) as $r ) {
			delete_transient( mcpss_history_key( $m['id'], $r ) );
		}
	}
}

/**
 * Fetch + sanitize history.
 *
 * @param string $id    Monitor UUID.
 * @param string $range Range.
 * @return array|WP_Error
 */
function mcpss_get_history( $id, $range ) {
	if ( ! preg_match( '/^[0-9a-f-]{36}$/i', $id ) ) {
		return new WP_Error( 'mcpss_bad_id', __( 'History is not available for this monitor.', 'mcp-server-status' ) );
	}
	$ranges = mcpss_history_ranges();
	$range  = isset( $ranges[ $range ] ) ? $range : '7d';
	$key    = mcpss_history_key( $id, $range );
	$cached = get_transient( $key );
	if ( is_array( $cached ) ) {
		return $cached;
	}
	$res = mcpss_api( 'GET', '/api/wp/monitors/' . rawurlencode( $id ) . '/history?range=' . rawurlencode( $range ) );
	if ( is_wp_error( $res ) ) {
		return $res;
	}
	if ( 200 !== $res['code'] ) {
		$msg = isset( $res['body']['error'] ) ? (string) $res['body']['error'] : __( 'Could not load history.', 'mcp-server-status' );
		return new WP_Error( 'mcpss_api', $msg );
	}
	$b   = $res['body'];
	$num = function ( $a, $k ) {
		return isset( $a[ $k ] ) && is_numeric( $a[ $k ] ) ? 0 + $a[ $k ] : null;
	};
	$str = function ( $a, $k ) {
		return isset( $a[ $k ] ) && is_scalar( $a[ $k ] ) ? sanitize_text_field( (string) $a[ $k ] ) : '';
	};
	$sum     = isset( $b['summary'] ) && is_array( $b['summary'] ) ? $b['summary'] : array();
	$allowed = array();
	foreach ( isset( $b['allowedRanges'] ) ? (array) $b['allowedRanges'] : array() as $r ) {
		if ( is_string( $r ) && isset( $ranges[ $r ] ) ) {
			$allowed[] = $r;
		}
	}
	$out = array(
		'range'         => isset( $b['range'], $ranges[ $b['range'] ] ) ? $b['range'] : $range,
		'allowedRanges' => $allowed ? $allowed : array( '24h', '7d' ),
		'locked'        => array_map( 'sanitize_key', array_filter( isset( $b['locked'] ) ? (array) $b['locked'] : array(), 'is_string' ) ),
		'bucketMinutes' => (int) $num( $b, 'bucketMinutes' ),
		'summary'       => array(
			'totalChecks'     => (int) $num( $sum, 'totalChecks' ),
			'failedChecks'    => (int) $num( $sum, 'failedChecks' ),
			'uptimePct'       => $num( $sum, 'uptimePct' ),
			'notEnoughData'   => ! empty( $sum['notEnoughData'] ),
			'incidents'       => (int) $num( $sum, 'incidents' ),
			'avgLatencyMs'    => $num( $sum, 'avgLatencyMs' ),
			'downtimeMinutes' => $num( $sum, 'downtimeMinutes' ),
		),
		'buckets'       => array(),
		'incidents'     => array(),
		'recentChecks'  => array(),
		'reportUrl'     => isset( $b['reportUrl'] ) ? esc_url_raw( $b['reportUrl'] ) : '',
		'upgradeUrl'    => isset( $b['upgradeUrl'] ) ? esc_url_raw( $b['upgradeUrl'] ) : 'https://mcpserverstatus.com/pricing',
	);
	foreach ( array_slice( isset( $b['buckets'] ) ? (array) $b['buckets'] : array(), 0, 120 ) as $x ) {
		if ( is_array( $x ) ) {
			$st               = $str( $x, 'status' );
			$out['buckets'][] = array(
				'start'   => $str( $x, 'start' ),
				'total'   => (int) $num( $x, 'total' ),
				'up'      => (int) $num( $x, 'up' ),
				'status'  => in_array( $st, array( 'up', 'partial', 'down' ), true ) ? $st : 'none',
				'latency' => $num( $x, 'avgLatencyMs' ),
			);
		}
	}
	foreach ( array_slice( isset( $b['incidents'] ) ? (array) $b['incidents'] : array(), 0, 5 ) as $x ) {
		if ( is_array( $x ) ) {
			$out['incidents'][] = array(
				'startedAt'       => $str( $x, 'startedAt' ),
				'resolvedAt'      => $str( $x, 'resolvedAt' ),
				'durationMinutes' => (int) $num( $x, 'durationMinutes' ),
				'cause'           => $str( $x, 'cause' ),
			);
		}
	}
	foreach ( array_slice( isset( $b['recentChecks'] ) ? (array) $b['recentChecks'] : array(), 0, 10 ) as $x ) {
		if ( is_array( $x ) ) {
			$out['recentChecks'][] = array(
				'timestamp' => $str( $x, 'timestamp' ),
				'status'    => $str( $x, 'status' ),
				'latencyMs' => $num( $x, 'latencyMs' ),
			);
		}
	}
	set_transient( $key, $out, 5 * MINUTE_IN_SECONDS );
	return $out;
}

/**
 * Human duration.
 *
 * @param int $m Minutes.
 * @return string
 */
function mcpss_duration( $m ) {
	$m = max( 0, (int) $m );
	if ( $m < 60 ) {
		/* translators: %d: minutes. */
		return sprintf( __( '%d min', 'mcp-server-status' ), $m );
	}
	if ( $m < 1440 ) {
		/* translators: 1: hours, 2: minutes. */
		return sprintf( __( '%1$dh %2$dm', 'mcp-server-status' ), floor( $m / 60 ), $m % 60 );
	}
	/* translators: 1: days, 2: hours. */
	return sprintf( __( '%1$dd %2$dh', 'mcp-server-status' ), floor( $m / 1440 ), floor( ( $m % 1440 ) / 60 ) );
}

/**
 * Locked placeholder.
 *
 * @param string $label   Label.
 * @param string $upgrade Upgrade URL.
 * @param string $extra   Extra class.
 */
function mcpss_locked( $label, $upgrade, $extra = '' ) {
	?>
	<div class="mcpss-locked <?php echo esc_attr( $extra ); ?>">
		<div class="mcpss-locked-blur" aria-hidden="true"><span></span><span></span><span></span></div>
		<div class="mcpss-locked-msg">
			<strong><span class="dashicons dashicons-lock" aria-hidden="true"></span> <?php echo esc_html( $label ); ?></strong>
			<a class="button button-primary" href="<?php echo esc_url( $upgrade ); ?>" target="_blank" rel="noopener noreferrer"><?php esc_html_e( 'Upgrade to Pro', 'mcp-server-status' ); ?></a>
		</div>
	</div>
	<?php
}

/**
 * Inline SVG latency sparkline.
 *
 * @param array $buckets Buckets.
 * @return string Safe SVG markup.
 */
function mcpss_sparkline( $buckets ) {
	$w    = 600;
	$h    = 90;
	$n    = count( $buckets );
	$vals = array();
	foreach ( $buckets as $b ) {
		if ( null !== $b['latency'] ) {
			$vals[] = (float) $b['latency'];
		}
	}
	if ( ! $vals || $n < 2 ) {
		return '<p class="description">' . esc_html__( 'No latency data in this range yet.', 'mcp-server-status' ) . '</p>';
	}
	$max  = max( 50, max( $vals ) ) * 1.1;
	$path = '';
	$pen  = false;
	foreach ( $buckets as $i => $b ) {
		if ( null === $b['latency'] ) {
			$pen = false;
			continue;
		}
		$x     = 4 + $i * ( $w - 8 ) / ( $n - 1 );
		$y     = $h - 6 - ( (float) $b['latency'] / $max ) * ( $h - 14 );
		$path .= ( $pen ? 'L' : 'M' ) . round( $x, 1 ) . ',' . round( $y, 1 );
		$pen   = true;
	}
	return '<svg class="mcpss-spark" viewBox="0 0 ' . $w . ' ' . $h . '" preserveAspectRatio="none" role="img" aria-label="' . esc_attr__( 'Latency history', 'mcp-server-status' ) . '"><path d="' . esc_attr( $path ) . '" fill="none" stroke="#155eef" stroke-width="2" vector-effect="non-scaling-stroke"/></svg>'
		. '<p class="mcpss-spark-axis"><span>0</span><span>' . esc_html( round( $max ) . ' ms' ) . '</span></p>';
}

/**
 * Render the history panel for one monitor.
 *
 * @param array  $m     Monitor (from mcpss_get_monitors).
 * @param string $range Requested range.
 */
function mcpss_render_history_panel( $m, $range ) {
	$h = mcpss_get_history( isset( $m['id'] ) ? $m['id'] : '', $range );
	echo '<div class="mcpss-card mcpss-history" id="mcpss-history">';
	echo '<div class="mcpss-history-head"><div><span class="mcpss-eyebrow">' . esc_html__( 'Monitor history', 'mcp-server-status' ) . '</span><h2>' . esc_html( $m['name'] ? $m['name'] : $m['url'] ) . '</h2></div>';
	if ( ! is_wp_error( $h ) && $h['reportUrl'] ) {
		echo '<a class="button" href="' . esc_url( $h['reportUrl'] ) . '" target="_blank" rel="noopener noreferrer">' . esc_html__( 'View full report', 'mcp-server-status' ) . ' <span aria-hidden="true">↗</span></a>';
	}
	echo '</div>';
	if ( is_wp_error( $h ) ) {
		echo '<p class="description">' . esc_html( $h->get_error_message() ) . '</p></div>';
		return;
	}
	$locked = array_flip( $h['locked'] );
	$up     = $h['upgradeUrl'];
	$s      = $h['summary'];
	echo '<nav class="mcpss-ranges" aria-label="' . esc_attr__( 'History range', 'mcp-server-status' ) . '">';
	foreach ( mcpss_history_ranges() as $id => $label ) {
		if ( in_array( $id, $h['allowedRanges'], true ) ) {
			$url = mcpss_settings_url(
				array(
					'tab'          => 'overview',
					'mcpss_detail' => $m['publicId'],
					'mcpss_range'  => $id,
				)
			) . '#mcpss-history';
			echo '<a class="mcpss-range' . ( $id === $h['range'] ? ' is-active' : '' ) . '" href="' . esc_url( $url ) . '"' . ( $id === $h['range'] ? ' aria-current="true"' : '' ) . '>' . esc_html( $label ) . '</a>';
		} else {
			echo '<a class="mcpss-range is-locked" href="' . esc_url( $up ) . '" target="_blank" rel="noopener noreferrer" title="' . esc_attr__( 'Upgrade for longer history', 'mcp-server-status' ) . '"><span class="dashicons dashicons-lock" aria-hidden="true"></span> ' . esc_html( $label ) . '</a>';
		}
	}
	echo '</nav>';

	$kpis = array(
		array( __( 'Uptime', 'mcp-server-status' ), null !== $s['uptimePct'] ? number_format_i18n( $s['uptimePct'], 2 ) . '%' : ( ! empty( $s['notEnoughData'] ) ? __( 'Not enough data', 'mcp-server-status' ) : '—' ), false ),
		array( __( 'Checks', 'mcp-server-status' ), number_format_i18n( $s['totalChecks'] ), false ),
		array( __( 'Failed', 'mcp-server-status' ), number_format_i18n( $s['failedChecks'] ), false ),
		array( __( 'Incidents', 'mcp-server-status' ), number_format_i18n( $s['incidents'] ), false ),
		array( __( 'Avg latency', 'mcp-server-status' ), null !== $s['avgLatencyMs'] ? number_format_i18n( $s['avgLatencyMs'] ) . ' ms' : '—', isset( $locked['latency'] ) ),
		array( __( 'Downtime', 'mcp-server-status' ), mcpss_duration( (int) $s['downtimeMinutes'] ), isset( $locked['downtime'] ) ),
	);
	echo '<div class="mcpss-kpis">';
	foreach ( $kpis as $k ) {
		if ( $k[2] ) {
			echo '<div class="mcpss-kpi is-locked"><span>' . esc_html( $k[0] ) . '</span><strong aria-hidden="true">000</strong><a href="' . esc_url( $up ) . '" target="_blank" rel="noopener noreferrer"><span class="dashicons dashicons-lock" aria-hidden="true"></span> ' . esc_html__( 'Pro', 'mcp-server-status' ) . '</a></div>';
		} else {
			echo '<div class="mcpss-kpi"><span>' . esc_html( $k[0] ) . '</span><strong>' . esc_html( $k[1] ) . '</strong></div>';
		}
	}
	echo '</div>';

	echo '<h3 class="mcpss-sub">' . esc_html__( 'Status history', 'mcp-server-status' ) . '</h3><div class="mcpss-bars" role="img" aria-label="' . esc_attr__( 'Status timeline', 'mcp-server-status' ) . '">';
	foreach ( $h['buckets'] as $b ) {
		$tip = mcpss_format_datetime( $b['start'] ) . ' – ' . ( $b['total'] ? sprintf( /* translators: 1: healthy, 2: total */ __( '%1$d/%2$d healthy', 'mcp-server-status' ), $b['up'], $b['total'] ) : __( 'no checks', 'mcp-server-status' ) );
		echo '<span class="is-' . esc_attr( $b['status'] ) . '" title="' . esc_attr( $tip ) . '"></span>';
	}
	echo '</div><p class="mcpss-legend"><i class="is-up"></i>' . esc_html__( 'Healthy', 'mcp-server-status' ) . ' <i class="is-partial"></i>' . esc_html__( 'Partial', 'mcp-server-status' ) . ' <i class="is-down"></i>' . esc_html__( 'Down', 'mcp-server-status' ) . ' <i class="is-none"></i>' . esc_html__( 'No data', 'mcp-server-status' ) . '</p>';

	echo '<h3 class="mcpss-sub">' . esc_html__( 'Latency', 'mcp-server-status' ) . '</h3>';
	if ( isset( $locked['latency'] ) ) {
		mcpss_locked( __( 'Latency history is a Pro feature', 'mcp-server-status' ), $up );
	} else {
		echo mcpss_sparkline( $h['buckets'] ); // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- built from numbers and escaped strings.
	}

	echo '<div class="mcpss-two">';
	echo '<div><h3 class="mcpss-sub">' . esc_html( isset( $locked['incidents_full'] ) ? __( 'Latest incident', 'mcp-server-status' ) : __( 'Recent incidents', 'mcp-server-status' ) ) . '</h3>';
	if ( ! $h['incidents'] ) {
		echo '<p class="description">' . esc_html__( 'No incidents in this range.', 'mcp-server-status' ) . '</p>';
	} else {
		echo '<ul class="mcpss-incidents">';
		foreach ( $h['incidents'] as $i ) {
			$open = '' === $i['resolvedAt'];
			echo '<li><span class="mcpss-inc-state ' . ( $open ? 'is-down' : 'is-up' ) . '">' . esc_html( $open ? __( 'Ongoing', 'mcp-server-status' ) : __( 'Resolved', 'mcp-server-status' ) ) . '</span> <strong>' . esc_html( mcpss_duration( $i['durationMinutes'] ) ) . '</strong><br /><small>' . esc_html( mcpss_format_datetime( $i['startedAt'] ) ) . ( $open ? '' : ' → ' . esc_html( mcpss_format_datetime( $i['resolvedAt'] ) ) ) . '</small>' . ( $i['cause'] ? '<br /><small class="mcpss-cause">' . esc_html( $i['cause'] ) . '</small>' : '' ) . '</li>';
		}
		echo '</ul>';
	}
	if ( isset( $locked['incidents_full'] ) ) {
		echo '<a class="mcpss-upgrade" href="' . esc_url( $up ) . '" target="_blank" rel="noopener noreferrer">' . esc_html__( 'Upgrade to Pro for the full incident log', 'mcp-server-status' ) . '</a>';
	}
	echo '</div><div><h3 class="mcpss-sub">' . esc_html__( 'Recent checks', 'mcp-server-status' ) . '</h3>';
	if ( isset( $locked['recent_checks'] ) ) {
		mcpss_locked( __( 'Check log is a Pro feature', 'mcp-server-status' ), $up, 'is-small' );
	} elseif ( ! $h['recentChecks'] ) {
		echo '<p class="description">' . esc_html__( 'No checks yet.', 'mcp-server-status' ) . '</p>';
	} else {
		echo '<table class="widefat striped mcpss-checks"><tbody>';
		foreach ( $h['recentChecks'] as $c ) {
			echo '<tr><td>' . esc_html( mcpss_format_datetime( $c['timestamp'] ) ) . '</td><td>' . esc_html( $c['status'] ) . '</td><td>' . esc_html( null !== $c['latencyMs'] ? number_format_i18n( $c['latencyMs'] ) . ' ms' : '—' ) . '</td></tr>';
		}
		echo '</tbody></table>';
	}
	echo '</div></div></div>';
}