feat: Expand group-level defaults with more monitor options

Add support for setting these options at group level:
- hide_ssl_days, hide_ping, round_response_time, round_uptime
- method, user_agent, headers, expected_status

This allows configuring common settings once per group instead of
repeating them on every monitor.

2 files changed, 85 insertions, 21 deletions

diff --git a/config.example.yaml b/config.example.yaml
index 3fe5fa8..b9d4ae1 100644
--- a/config.example.yaml
+++ b/config.example.yaml
@@ -61,13 +61,23 @@ groups:
   - name: "Web Services"
     # default_collapsed: false     # Start collapsed (false = expanded by default)
     # show_group_uptime: true      # Show aggregate uptime percentage (true by default)
-     # Group-level defaults (optional - apply to all monitors in this group unless overridden)
-     # defaults:
-     #   interval: 30s
-     #   timeout: 10s
-     #   retries: 2
-     #   verify_ssl: true
-     #   disable_ping_tooltips: false
+    # Group-level defaults (optional - apply to all monitors in this group unless overridden)
+    # defaults:
+    #   interval: 30s
+    #   timeout: 10s
+    #   retries: 2
+    #   verify_ssl: true
+    #   hide_ssl_days: false
+    #   hide_ping: false
+    #   round_response_time: false
+    #   round_uptime: false
+    #   disable_ping_tooltips: false
+    #   disable_uptime_tooltip: false
+    #   method: GET
+    #   user_agent: "Custom-Agent/1.0"
+    #   expected_status: 200
+    #   headers:
+    #     Authorization: "Bearer token"
     monitors:
       - name: "Website"
         type: https
@@ -219,7 +229,16 @@ incidents:
 #     timeout: duration          - Default timeout for all monitors in group
 #     retries: int               - Default retry attempts for all monitors in group
 #     verify_ssl: bool           - Default SSL verification for all monitors in group
-#     disable_ping_tooltips: bool - Default tooltip behavior for all monitors in group
+#     hide_ssl_days: bool        - Hide SSL certificate days left (default: false)
+#     hide_ping: bool            - Hide response time from display (default: false)
+#     round_response_time: bool  - Round response time to nearest second (default: false)
+#     round_uptime: bool         - Round uptime percentage (default: false)
+#     disable_ping_tooltips: bool - Disable hover tooltips on ping bars (default: false)
+#     disable_uptime_tooltip: bool - Disable uptime tooltip with last failure info (default: false)
+#     method: string             - HTTP method for HTTP/HTTPS monitors (default: GET)
+#     user_agent: string         - Custom User-Agent header
+#     expected_status: int       - Expected HTTP status code (default: 200)
+#     headers: map[string]string - Custom headers to send
 #   Note: Individual monitors can override these defaults
 #
 # Common fields for all monitor types:
@@ -235,9 +254,11 @@ incidents:
 #   reset_on_next_check: bool    - When true, wipes all historical data for this monitor on next check
 #                                  Automatically flips to false after reset completes
 #   hide_ssl_days: bool          - Hide SSL/TLS certificate days left from display (default: false)
+#   hide_ping: bool              - Hide response time from display and tooltips (default: false)
 #   round_response_time: bool    - Round response time to nearest second (default: false)
 #   round_uptime: bool           - Round uptime percentage to whole number (e.g., 99.99% → 100%) (default: false)
 #   disable_ping_tooltips: bool  - Disable hover tooltips on ping history bars (default: false, or group default)
+#   disable_uptime_tooltip: bool - Disable uptime tooltip showing last failure info (default: false)
 #
 # HTTP/HTTPS specific fields:
 #   expected_status: int         - Expected HTTP status code (default: 200)
diff --git a/internal/config/config.go b/internal/config/config.go
index 0d9329d..5c485d9 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -68,12 +68,20 @@ type GroupConfig struct {
 
 // MonitorDefaults contains default values that can be set at group level
 type MonitorDefaults struct {
-	Interval             *Duration `yaml:"interval,omitempty"`
-	Timeout              *Duration `yaml:"timeout,omitempty"`
-	Retries              *int      `yaml:"retries,omitempty"`
-	VerifySSL            *bool     `yaml:"verify_ssl,omitempty"`
-	DisablePingTooltips  *bool     `yaml:"disable_ping_tooltips,omitempty"`
-	DisableUptimeTooltip *bool     `yaml:"disable_uptime_tooltip,omitempty"`
+	Interval             *Duration         `yaml:"interval,omitempty"`
+	Timeout              *Duration         `yaml:"timeout,omitempty"`
+	Retries              *int              `yaml:"retries,omitempty"`
+	VerifySSL            *bool             `yaml:"verify_ssl,omitempty"`
+	HideSSLDays          *bool             `yaml:"hide_ssl_days,omitempty"`
+	HidePing             *bool             `yaml:"hide_ping,omitempty"`
+	RoundResponseTime    *bool             `yaml:"round_response_time,omitempty"`
+	RoundUptime          *bool             `yaml:"round_uptime,omitempty"`
+	DisablePingTooltips  *bool             `yaml:"disable_ping_tooltips,omitempty"`
+	DisableUptimeTooltip *bool             `yaml:"disable_uptime_tooltip,omitempty"`
+	Method               string            `yaml:"method,omitempty"`
+	UserAgent            string            `yaml:"user_agent,omitempty"`
+	Headers              map[string]string `yaml:"headers,omitempty"`
+	ExpectedStatus       *int              `yaml:"expected_status,omitempty"`
 }
 
 // MonitorConfig represents a single monitor
@@ -287,13 +295,48 @@ func (c *Config) applyDefaults() {
 					}
 				}
 			}
-			// Apply group-level disable_ping_tooltips default
-			if !m.DisablePingTooltips && grp.Defaults != nil && grp.Defaults.DisablePingTooltips != nil && *grp.Defaults.DisablePingTooltips {
-				m.DisablePingTooltips = true
-			}
-			// Apply group-level disable_uptime_tooltip default
-			if !m.DisableUptimeTooltip && grp.Defaults != nil && grp.Defaults.DisableUptimeTooltip != nil && *grp.Defaults.DisableUptimeTooltip {
-				m.DisableUptimeTooltip = true
+			// Apply group-level boolean defaults (only if not explicitly set on monitor)
+			if grp.Defaults != nil {
+				if !m.HideSSLDays && grp.Defaults.HideSSLDays != nil && *grp.Defaults.HideSSLDays {
+					m.HideSSLDays = true
+				}
+				if !m.HidePing && grp.Defaults.HidePing != nil && *grp.Defaults.HidePing {
+					m.HidePing = true
+				}
+				if !m.RoundResponseTime && grp.Defaults.RoundResponseTime != nil && *grp.Defaults.RoundResponseTime {
+					m.RoundResponseTime = true
+				}
+				if !m.RoundUptime && grp.Defaults.RoundUptime != nil && *grp.Defaults.RoundUptime {
+					m.RoundUptime = true
+				}
+				if !m.DisablePingTooltips && grp.Defaults.DisablePingTooltips != nil && *grp.Defaults.DisablePingTooltips {
+					m.DisablePingTooltips = true
+				}
+				if !m.DisableUptimeTooltip && grp.Defaults.DisableUptimeTooltip != nil && *grp.Defaults.DisableUptimeTooltip {
+					m.DisableUptimeTooltip = true
+				}
+				// Apply string defaults (only if not set on monitor)
+				if m.Method == "" && grp.Defaults.Method != "" {
+					m.Method = grp.Defaults.Method
+				}
+				if m.UserAgent == "" && grp.Defaults.UserAgent != "" {
+					m.UserAgent = grp.Defaults.UserAgent
+				}
+				// Apply headers (merge, monitor headers take precedence)
+				if len(grp.Defaults.Headers) > 0 {
+					if m.Headers == nil {
+						m.Headers = make(map[string]string)
+					}
+					for k, v := range grp.Defaults.Headers {
+						if _, exists := m.Headers[k]; !exists {
+							m.Headers[k] = v
+						}
+					}
+				}
+				// Apply expected_status default
+				if m.ExpectedStatus == 0 && grp.Defaults.ExpectedStatus != nil {
+					m.ExpectedStatus = *grp.Defaults.ExpectedStatus
+				}
 			}
 		}
 	}