config

type Config struct {
	// Global settings (not inherited by scale sets)
	LogLevel   string `mapstructure:"log-level"`
	LogFormat  string `mapstructure:"log-format"`
	HealthPort int    `mapstructure:"health-port"`
	DryRun     bool   `mapstructure:"dry-run"`

	// Default values for scale sets + single-mode fields.
	// Squashed so TOML keys (url, name, backend, etc.) stay at the top level.
	Defaults ScaleSetConfig `mapstructure:",squash"`

	// Multi-scaleset mode: each entry inherits from Defaults.
	ScaleSets []ScaleSetConfig `mapstructure:"scaleset"`
}

type DockerConfig struct {
	Socket       string `mapstructure:"socket"`
	DinD         *bool  `mapstructure:"dind"` // pointer: nil = inherit default (true)
	SharedVolume string `mapstructure:"shared-volume"`
	Memory       int    `mapstructure:"memory"`   // Memory limit in MB (0 = unlimited)
	CPU          int    `mapstructure:"cpu"`      // CPU cores (0 = unlimited)
	Platform     string `mapstructure:"platform"` // e.g. "linux/amd64" to force architecture

	// SharedVolumeTTL deletes files in shared-volume older than this duration.
	// 0 (default) disables TTL cleanup. Accepts Go duration strings, e.g. "168h".
	SharedVolumeTTL time.Duration `mapstructure:"shared-volume-ttl"`
	// SharedVolumeCleanupInterval is how often the TTL sweep runs while
	// runner is up. Ignored when SharedVolumeTTL is 0. Defaults to
	// DefaultSharedVolumeCleanupInterval when unset.
	SharedVolumeCleanupInterval time.Duration `mapstructure:"shared-volume-cleanup-interval"`

	// BuildxCleanup enables automatic removal of orphaned buildx BuildKit
	// builder containers and their state volumes. Pointer: nil = inherit
	// default (true). Disable (false) only if you run a persistent builder
	// via `keep-state` + a fixed builder name, which this sweep would reclaim.
	BuildxCleanup *bool `mapstructure:"buildx-cleanup"`
	// BuildxCleanupTTL removes buildx builders older than this duration.
	// Defaults to DefaultBuildxCleanupTTL when unset. Set generously above
	// your longest build so in-progress builds are never disrupted.
	BuildxCleanupTTL time.Duration `mapstructure:"buildx-cleanup-ttl"`
	// BuildxCleanupInterval is how often the buildx cleanup sweep runs while
	// runner is up. Defaults to DefaultBuildxCleanupInterval when unset.
	BuildxCleanupInterval time.Duration `mapstructure:"buildx-cleanup-interval"`
}

type ScaleSetConfig struct {
	RegistrationURL string   `mapstructure:"url"`
	ScaleSetName    string   `mapstructure:"name"`
	Token           string   `mapstructure:"token"`
	MaxRunners      int      `mapstructure:"max-runners"`
	MinRunners      int      `mapstructure:"min-runners"`
	Labels          []string `mapstructure:"labels"`
	RunnerGroup     string   `mapstructure:"runner-group"`
	RunnerImage     string   `mapstructure:"runner-image"`
	Backend         string   `mapstructure:"backend"`

	// Docker backend settings
	Docker DockerConfig `mapstructure:"docker"`

	// Tart VM backend settings
	Tart TartConfig `mapstructure:"tart"`
}

type TartConfig struct {
	Home      string `mapstructure:"home"`       // TART_HOME for tart CLI ("" = default ~/.tart)
	RunnerDir string `mapstructure:"runner-dir"` // Runner binary path in VM
	CPU       int    `mapstructure:"cpu"`        // Number of CPU cores (0 = use image default)
	Memory    int    `mapstructure:"memory"`     // Memory in MB (0 = use image default)
	PoolSize  int    `mapstructure:"pool-size"`  // Pre-warmed VM count (0 = disabled)

	// CacheCleanup enables periodic `tart prune` of the OCI/IPSW caches under
	// TART_HOME. Pointer: nil = inherit default (true). Local VMs are never
	// touched. Disable (false) only if you manage the cache yourself.
	CacheCleanup *bool `mapstructure:"cache-cleanup"`
	// CacheMaxAge removes cache entries not accessed within this window via
	// `tart prune --older-than`. Defaults to DefaultTartCacheMaxAge when unset.
	// Granularity is whole days; sub-day values floor to 1 day.
	CacheMaxAge time.Duration `mapstructure:"cache-max-age"`
	// CacheSpaceBudgetGB is an optional hard cap on the OCI/IPSW cache size
	// (in GB), enforced via `tart prune --space-budget` on top of the age-based
	// sweep — least-recently-used entries are removed until the total fits.
	// 0 (default) means no size cap (age-based cleanup still runs).
	CacheSpaceBudgetGB int `mapstructure:"cache-space-budget"`
	// CacheCleanupInterval is how often the prune sweep runs while runner
	// is up. Ignored when cache cleanup is disabled. Defaults to
	// DefaultTartCacheCleanupInterval when unset.
	CacheCleanupInterval time.Duration `mapstructure:"cache-cleanup-interval"`
}