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path: root/internal/config/config.go
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package config

import (
	"fmt"
	"os"
	"strings"
	"time"

	"gopkg.in/yaml.v3"
)

// Config represents the root configuration structure
type Config struct {
	Site      SiteConfig       `yaml:"site"`
	Server    ServerConfig     `yaml:"server"`
	Storage   StorageConfig    `yaml:"storage"`
	Display   DisplayConfig    `yaml:"display"`
	Groups    []GroupConfig    `yaml:"groups"`
	Incidents []IncidentConfig `yaml:"incidents"`
}

// DisplayConfig contains display/UI settings
type DisplayConfig struct {
	// TickMode controls how history is aggregated: ping, minute, hour, day
	TickMode string `yaml:"tick_mode"`
	// TickCount is the number of ticks/bars to display in the history
	TickCount int `yaml:"tick_count"`
	// PingFixedSlots: when true and tick_mode=ping, shows fixed slots with empty bars
	// when false, bars grow dynamically as pings come in
	PingFixedSlots bool `yaml:"ping_fixed_slots"`
	// Timezone for display (e.g., "UTC", "America/New_York", "Local")
	Timezone string `yaml:"timezone"`
	// Scale adjusts the overall UI scale (default: 1.0, range: 0.5-2.0)
	Scale float64 `yaml:"scale"`
}

// SiteConfig contains site metadata
type SiteConfig struct {
	Name        string `yaml:"name"`
	Description string `yaml:"description"`
	Logo        string `yaml:"logo"`
	Favicon     string `yaml:"favicon"`
	ThemeURL    string `yaml:"theme_url"`   // URL to OpenCode-compatible theme JSON
	CustomHead  string `yaml:"custom_head"` // Custom HTML to inject into <head> (e.g., analytics)
}

// ServerConfig contains HTTP server settings
type ServerConfig struct {
	Host string `yaml:"host"`
	Port int    `yaml:"port"`
}

// StorageConfig contains database settings
type StorageConfig struct {
	Path        string `yaml:"path"`
	HistoryDays int    `yaml:"history_days"`
}

// GroupConfig represents a group of monitors
type GroupConfig struct {
	Name             string          `yaml:"name"`
	Monitors         []MonitorConfig `yaml:"monitors"`
	DefaultCollapsed *bool           `yaml:"default_collapsed"` // nil = false (expanded by default)
	ShowGroupUptime  *bool           `yaml:"show_group_uptime"` // nil = true (show by default)
	// Group-level defaults that apply to all monitors in the group (can be overridden per monitor)
	Defaults *MonitorDefaults `yaml:"defaults,omitempty"`
}

// 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"`
}

// MonitorConfig represents a single monitor
type MonitorConfig struct {
	Name                string            `yaml:"name"`
	Type                string            `yaml:"type"` // http, https, tcp, gemini
	Target              string            `yaml:"target"`
	Link                string            `yaml:"link,omitempty"` // Custom URL for clicking the monitor name (e.g., docs page)
	Interval            Duration          `yaml:"interval"`
	Timeout             Duration          `yaml:"timeout"`
	Retries             int               `yaml:"retries,omitempty"`             // Number of retry attempts before marking as down
	ResetOnNextCheck    bool              `yaml:"reset_on_next_check,omitempty"` // Wipe monitor data on next check and flip to false
	ExpectedStatus      int               `yaml:"expected_status,omitempty"`
	ExpectedContent     string            `yaml:"expected_content,omitempty"` // Expected text in response body
	VerifySSL           *bool             `yaml:"verify_ssl,omitempty"`
	HideSSLDays         bool              `yaml:"hide_ssl_days,omitempty"`         // Hide SSL days left from display
	HidePing            bool              `yaml:"hide_ping,omitempty"`             // Hide response time from display
	RoundResponseTime   bool              `yaml:"round_response_time,omitempty"`   // Round response time to nearest second
	RoundUptime         bool              `yaml:"round_uptime,omitempty"`          // Round uptime percentage (e.g., 99.99% → 100%)
	DisablePingTooltips bool              `yaml:"disable_ping_tooltips,omitempty"` // Disable hover tooltips on ping history bars
	Method              string            `yaml:"method,omitempty"`
	UserAgent           string            `yaml:"user_agent,omitempty"` // Custom User-Agent header (default: "Kaze-Monitor/1.0")
	Headers             map[string]string `yaml:"headers,omitempty"`
	Body                string            `yaml:"body,omitempty"`
	// ICMP specific fields
	PingCount int `yaml:"ping_count,omitempty"` // Number of ICMP packets to send (default: 4)
	// DNS specific fields
	DNSServer     string   `yaml:"dns_server,omitempty"`     // DNS server to query (default: system resolver)
	ExpectedIPs   []string `yaml:"expected_ips,omitempty"`   // Expected IP addresses for DNS resolution
	ExpectedCNAME string   `yaml:"expected_cname,omitempty"` // Expected CNAME record
	RecordType    string   `yaml:"record_type,omitempty"`    // DNS record type (A, AAAA, CNAME, MX, TXT, etc.)
	// GraphQL specific fields
	GraphQLQuery     string            `yaml:"graphql_query,omitempty"`     // GraphQL query to execute
	GraphQLVariables map[string]string `yaml:"graphql_variables,omitempty"` // GraphQL query variables
	// Database specific fields
	DBType string `yaml:"db_type,omitempty"` // Database type: postgres, mysql, redis, memcached, mongodb
}

// IncidentConfig represents an incident or maintenance
type IncidentConfig struct {
	Title            string           `yaml:"title"`
	Status           string           `yaml:"status"` // scheduled, investigating, identified, monitoring, resolved
	Message          string           `yaml:"message"`
	ScheduledStart   *time.Time       `yaml:"scheduled_start,omitempty"`
	ScheduledEnd     *time.Time       `yaml:"scheduled_end,omitempty"`
	CreatedAt        *time.Time       `yaml:"created_at,omitempty"`
	ResolvedAt       *time.Time       `yaml:"resolved_at,omitempty"`
	AffectedMonitors []string         `yaml:"affected_monitors,omitempty"`
	Updates          []IncidentUpdate `yaml:"updates,omitempty"`
}

// IncidentUpdate represents an update to an incident
type IncidentUpdate struct {
	Time    time.Time `yaml:"time"`
	Status  string    `yaml:"status"`
	Message string    `yaml:"message"`
}

// Duration is a wrapper around time.Duration for YAML parsing
type Duration struct {
	time.Duration
}

// UnmarshalYAML implements yaml.Unmarshaler for Duration
func (d *Duration) UnmarshalYAML(value *yaml.Node) error {
	var s string
	if err := value.Decode(&s); err != nil {
		return err
	}
	duration, err := time.ParseDuration(s)
	if err != nil {
		return fmt.Errorf("invalid duration %q: %w", s, err)
	}
	d.Duration = duration
	return nil
}

// MarshalYAML implements yaml.Marshaler for Duration
func (d Duration) MarshalYAML() (interface{}, error) {
	return d.Duration.String(), nil
}

// Load reads and parses a configuration file
func Load(path string) (*Config, error) {
	data, err := os.ReadFile(path)
	if err != nil {
		return nil, fmt.Errorf("failed to read config file: %w", err)
	}

	var cfg Config
	if err := yaml.Unmarshal(data, &cfg); err != nil {
		return nil, fmt.Errorf("failed to parse config file: %w", err)
	}

	// Apply defaults
	cfg.applyDefaults()

	// Validate configuration
	if err := cfg.validate(); err != nil {
		return nil, fmt.Errorf("invalid configuration: %w", err)
	}

	return &cfg, nil
}

// applyDefaults sets default values for missing configuration
func (c *Config) applyDefaults() {
	if c.Site.Name == "" {
		c.Site.Name = "Kaze Status"
	}
	if c.Site.Description == "" {
		c.Site.Description = "Service Status Page"
	}
	if c.Server.Host == "" {
		c.Server.Host = "0.0.0.0"
	}
	if c.Server.Port == 0 {
		c.Server.Port = 8080
	}
	if c.Storage.Path == "" {
		c.Storage.Path = "./kaze.db"
	}
	if c.Storage.HistoryDays == 0 {
		c.Storage.HistoryDays = 90
	}

	// Apply display defaults
	if c.Display.TickMode == "" {
		c.Display.TickMode = "hour"
	}
	if c.Display.TickCount == 0 {
		c.Display.TickCount = 45
	}
	if c.Display.Timezone == "" {
		c.Display.Timezone = "Local"
	}
	if c.Display.Scale == 0 {
		c.Display.Scale = 1.0
	}
	// Clamp scale to reasonable range
	if c.Display.Scale < 0.5 {
		c.Display.Scale = 0.5
	} else if c.Display.Scale > 2.0 {
		c.Display.Scale = 2.0
	}

	// Apply group defaults
	for i := range c.Groups {
		grp := &c.Groups[i]
		if grp.DefaultCollapsed == nil {
			defaultCollapsed := false
			grp.DefaultCollapsed = &defaultCollapsed
		}
		if grp.ShowGroupUptime == nil {
			defaultShow := true
			grp.ShowGroupUptime = &defaultShow
		}

		for j := range c.Groups[i].Monitors {
			m := &c.Groups[i].Monitors[j]

			// Apply group-level defaults first, then monitor-level overrides
			if m.Interval.Duration == 0 {
				if grp.Defaults != nil && grp.Defaults.Interval != nil {
					m.Interval = *grp.Defaults.Interval
				} else {
					m.Interval.Duration = 30 * time.Second
				}
			}
			if m.Timeout.Duration == 0 {
				if grp.Defaults != nil && grp.Defaults.Timeout != nil {
					m.Timeout = *grp.Defaults.Timeout
				} else {
					m.Timeout.Duration = 10 * time.Second
				}
			}
			// Apply group-level retries default
			if m.Retries == 0 && grp.Defaults != nil && grp.Defaults.Retries != nil {
				m.Retries = *grp.Defaults.Retries
			}
			// Retries default to 0 (no retries) if not specified
			if m.Retries < 0 {
				m.Retries = 0
			}
			if m.Type == "http" || m.Type == "https" {
				if m.ExpectedStatus == 0 {
					m.ExpectedStatus = 200
				}
				if m.Method == "" {
					m.Method = "GET"
				}
				if m.VerifySSL == nil {
					// Apply group default if available
					if grp.Defaults != nil && grp.Defaults.VerifySSL != nil {
						m.VerifySSL = grp.Defaults.VerifySSL
					} else {
						defaultVerify := true
						m.VerifySSL = &defaultVerify
					}
				}
			}
			if m.Type == "gemini" {
				if m.VerifySSL == nil {
					// Apply group default if available
					if grp.Defaults != nil && grp.Defaults.VerifySSL != nil {
						m.VerifySSL = grp.Defaults.VerifySSL
					} else {
						defaultVerify := true
						m.VerifySSL = &defaultVerify
					}
				}
			}
			// Apply group-level disable_ping_tooltips default
			if !m.DisablePingTooltips && grp.Defaults != nil && grp.Defaults.DisablePingTooltips != nil && *grp.Defaults.DisablePingTooltips {
				m.DisablePingTooltips = true
			}
		}
	}
}

// validate checks the configuration for errors
func (c *Config) validate() error {
	if len(c.Groups) == 0 {
		return fmt.Errorf("at least one group with monitors is required")
	}

	for _, group := range c.Groups {
		if group.Name == "" {
			return fmt.Errorf("group name cannot be empty")
		}
		if len(group.Monitors) == 0 {
			return fmt.Errorf("group %q must have at least one monitor", group.Name)
		}
		for _, monitor := range group.Monitors {
			if monitor.Name == "" {
				return fmt.Errorf("monitor name cannot be empty in group %q", group.Name)
			}

			if monitor.Target == "" {
				return fmt.Errorf("monitor %q must have a target", monitor.Name)
			}

			switch monitor.Type {
			case "http", "https", "tcp", "gemini", "icmp", "dns", "graphql", "database", "db":
				// Valid types
			default:
				return fmt.Errorf("monitor %q has invalid type %q (must be http, https, tcp, gemini, icmp, dns, graphql, or database)", monitor.Name, monitor.Type)
			}

			// Type-specific validation
			if monitor.Type == "graphql" && monitor.GraphQLQuery == "" {
				return fmt.Errorf("monitor %q is type 'graphql' but missing required 'graphql_query' field", monitor.Name)
			}
			if (monitor.Type == "database" || monitor.Type == "db") && monitor.DBType == "" {
				return fmt.Errorf("monitor %q is type 'database' but missing required 'db_type' field", monitor.Name)
			}
		}
	}

	// Validate incidents
	for _, incident := range c.Incidents {
		if incident.Title == "" {
			return fmt.Errorf("incident title cannot be empty")
		}
		switch incident.Status {
		case "scheduled", "investigating", "identified", "monitoring", "resolved":
			// Valid statuses
		default:
			return fmt.Errorf("incident %q has invalid status %q", incident.Title, incident.Status)
		}
	}

	// Validate display config
	switch c.Display.TickMode {
	case "ping", "minute", "hour", "day":
		// Valid modes
	default:
		return fmt.Errorf("invalid tick_mode %q (must be ping, minute, hour, or day)", c.Display.TickMode)
	}

	if c.Display.TickCount < 1 || c.Display.TickCount > 200 {
		return fmt.Errorf("tick_count must be between 1 and 200, got %d", c.Display.TickCount)
	}

	return nil
}

// GetAllMonitors returns all monitors from all groups with their group names
func (c *Config) GetAllMonitors() []MonitorWithGroup {
	var monitors []MonitorWithGroup
	for _, group := range c.Groups {
		for _, monitor := range group.Monitors {
			monitors = append(monitors, MonitorWithGroup{
				GroupName: group.Name,
				Monitor:   monitor,
			})
		}
	}
	return monitors
}

// MonitorWithGroup pairs a monitor with its group name
type MonitorWithGroup struct {
	GroupName string
	Monitor   MonitorConfig
}

// UpdateResetFlag updates the reset_on_next_check flag for a specific monitor in the config file
// Uses a line-based approach to preserve original formatting and omitted fields
func UpdateResetFlag(configPath string, monitorName string, value bool) error {
	// Read the config file
	data, err := os.ReadFile(configPath)
	if err != nil {
		return fmt.Errorf("failed to read config file: %w", err)
	}

	lines := strings.Split(string(data), "\n")
	inMonitor := false
	monitorIndent := ""
	foundMonitor := false

	for i := 0; i < len(lines); i++ {
		line := lines[i]
		trimmed := strings.TrimSpace(line)

		// Check if this is the start of our target monitor
		if strings.HasPrefix(trimmed, "- name:") || strings.HasPrefix(trimmed, "name:") {
			// Extract monitor name from line
			namePart := strings.TrimPrefix(trimmed, "- name:")
			namePart = strings.TrimPrefix(namePart, "name:")
			namePart = strings.TrimSpace(namePart)
			namePart = strings.Trim(namePart, "\"'")

			if namePart == monitorName {
				inMonitor = true
				foundMonitor = true
				// Calculate the indentation level
				monitorIndent = line[:len(line)-len(strings.TrimLeft(line, " \t"))]
				continue
			}
		}

		// If we're in the target monitor, look for reset_on_next_check or end of monitor
		if inMonitor {
			// Check if we've left the monitor section (new monitor or less indented line)
			if strings.HasPrefix(trimmed, "- name:") || strings.HasPrefix(trimmed, "name:") {
				// We've reached another monitor without finding reset_on_next_check
				// Insert the line before this one if we're setting to false
				if !value {
					// Only add if setting to false (after a reset)
					insertLine := monitorIndent + "  reset_on_next_check: false"
					lines = append(lines[:i], append([]string{insertLine}, lines[i:]...)...)
				}
				break
			}

			// Check if this line is reset_on_next_check
			if strings.Contains(trimmed, "reset_on_next_check:") {
				// Update the value
				if !value {
					// Set to false after reset
					lines[i] = monitorIndent + "  reset_on_next_check: false"
				} else {
					// Keep as true (should already be true, but update to be sure)
					lines[i] = monitorIndent + "  reset_on_next_check: true"
				}
				break
			}
		}
	}

	if !foundMonitor {
		return fmt.Errorf("monitor %q not found in config", monitorName)
	}

	// Write back to file
	newData := []byte(strings.Join(lines, "\n"))
	if err := os.WriteFile(configPath, newData, 0644); err != nil {
		return fmt.Errorf("failed to write config file: %w", err)
	}

	return nil
}