package cmd

import (
	"log/slog"

	"github.com/portainer/kubesolo-os/update/pkg/bootenv"
	"github.com/portainer/kubesolo-os/update/pkg/config"
	"github.com/portainer/kubesolo-os/update/pkg/state"
)

// opts holds shared command-line options for all subcommands.
type opts struct {
	ServerURL         string
	Registry          string // OCI registry ref (e.g. ghcr.io/foo/kubesolo-os). Mutually exclusive with ServerURL.
	Tag               string // OCI tag to pull (default: equal to Channel, falling back to "stable")
	GrubenvPath       string
	TimeoutSecs       int
	PubKeyPath        string
	BootEnvType       string // "grub" or "rpi"
	BootEnvPath       string // path for RPi boot control dir
	StatePath          string // location of state.json (default: state.DefaultPath)
	ConfPath           string // location of update.conf (default: config.DefaultPath)
	Channel            string // update channel ("stable" by default)
	MaintenanceWindow  string // "HH:MM-HH:MM" or empty for always-allow
	HealthcheckURL     string // optional GET probe for healthcheck
	AutoRollbackAfter  int    // healthcheck: rollback after N consecutive failures (0=off)
	KubeSystemSettle   int    // healthcheck: kube-system pods must be Running for N seconds (0=disabled)
	Force              bool   // bypass maintenance window
	JSON               bool   // status: emit JSON instead of human-readable
}

// NewBootEnv creates a BootEnv from the parsed options.
func (o opts) NewBootEnv() bootenv.BootEnv {
	switch o.BootEnvType {
	case "rpi":
		return bootenv.NewRPi(o.BootEnvPath)
	default:
		return bootenv.NewGRUB(o.GrubenvPath)
	}
}

// parseOpts extracts command-line flags from args.
//
// Precedence: explicit CLI flags > /etc/kubesolo/update.conf > package
// defaults. The config file is loaded first so any CLI flag overrides it.
//
// Unknown flags are ignored (forward-compat).
func parseOpts(args []string) opts {
	o := opts{
		GrubenvPath: "/boot/grub/grubenv",
		TimeoutSecs: 120,
		BootEnvType: "grub",
		StatePath:   state.DefaultPath,
		ConfPath:    config.DefaultPath,
		Channel:     "stable",
	}

	// First pass: pick up --conf so it can point at a different file before
	// we load. (Tests pass --conf <tempdir>/update.conf.)
	for i := 0; i < len(args); i++ {
		if args[i] == "--conf" && i+1 < len(args) {
			o.ConfPath = args[i+1]
		}
	}

	// Load config file. Missing file is fine (fresh system, no cloud-init yet).
	if cfg, err := config.Load(o.ConfPath); err == nil && cfg != nil {
		if cfg.Server != "" {
			o.ServerURL = cfg.Server
		}
		if cfg.Channel != "" {
			o.Channel = cfg.Channel
		}
		if cfg.MaintenanceWindow != "" {
			o.MaintenanceWindow = cfg.MaintenanceWindow
		}
		if cfg.PubKey != "" {
			o.PubKeyPath = cfg.PubKey
		}
		if cfg.HealthcheckURL != "" {
			o.HealthcheckURL = cfg.HealthcheckURL
		}
		if cfg.AutoRollbackAfter > 0 {
			o.AutoRollbackAfter = cfg.AutoRollbackAfter
		}
	} else if err != nil {
		slog.Warn("could not load update.conf", "path", o.ConfPath, "error", err)
	}

	// Second pass: CLI overrides config file values.
	for i := 0; i < len(args); i++ {
		switch args[i] {
		case "--conf":
			i++ // already handled above
		case "--state":
			if i+1 < len(args) {
				o.StatePath = args[i+1]
				i++
			}
		case "--channel":
			if i+1 < len(args) {
				o.Channel = args[i+1]
				i++
			}
		case "--maintenance-window":
			if i+1 < len(args) {
				o.MaintenanceWindow = args[i+1]
				i++
			}
		case "--force":
			o.Force = true
		case "--healthcheck-url":
			if i+1 < len(args) {
				o.HealthcheckURL = args[i+1]
				i++
			}
		case "--auto-rollback-after":
			if i+1 < len(args) {
				n := 0
				for _, ch := range args[i+1] {
					if ch >= '0' && ch <= '9' {
						n = n*10 + int(ch-'0')
					} else {
						n = 0
						break
					}
				}
				if n > 0 {
					o.AutoRollbackAfter = n
				}
				i++
			}
		case "--kube-system-settle":
			if i+1 < len(args) {
				n := 0
				for _, ch := range args[i+1] {
					if ch >= '0' && ch <= '9' {
						n = n*10 + int(ch-'0')
					} else {
						n = 0
						break
					}
				}
				if n > 0 {
					o.KubeSystemSettle = n
				}
				i++
			}
		case "--json":
			o.JSON = true
		case "--server":
			if i+1 < len(args) {
				o.ServerURL = args[i+1]
				i++
			}
		case "--registry":
			if i+1 < len(args) {
				o.Registry = args[i+1]
				i++
			}
		case "--tag":
			if i+1 < len(args) {
				o.Tag = args[i+1]
				i++
			}
		case "--grubenv":
			if i+1 < len(args) {
				o.GrubenvPath = args[i+1]
				i++
			}
		case "--timeout":
			if i+1 < len(args) {
				val := 0
				for _, c := range args[i+1] {
					if c >= '0' && c <= '9' {
						val = val*10 + int(c-'0')
					}
				}
				if val > 0 {
					o.TimeoutSecs = val
				}
				i++
			}
		case "--pubkey":
			if i+1 < len(args) {
				o.PubKeyPath = args[i+1]
				i++
			}
		case "--bootenv":
			if i+1 < len(args) {
				o.BootEnvType = args[i+1]
				i++
			}
		case "--bootenv-path":
			if i+1 < len(args) {
				o.BootEnvPath = args[i+1]
				i++
			}
		}
	}

	return o
}