package config

import (
	"errors"
	"os"

	"gopkg.in/yaml.v3"
)

func Load(path string) (Config, error) {
	var cfg Config
	data, err := os.ReadFile(path)
	if err != nil {
		return cfg, err
	}
	if err := yaml.Unmarshal(data, &cfg); err != nil {
		return cfg, err
	}
	return cfg, Validate(cfg)
}

func Save(path string, cfg Config) error {
	if err := Validate(cfg); err != nil {
		return err
	}
	data, err := yaml.Marshal(cfg)
	if err != nil {
		return err
	}
	return os.WriteFile(path, data, 0644)
}

func Validate(cfg Config) error {
	if cfg.WorkspaceDir == "" {
		return errors.New("workspaceDir is required")
	}
	if cfg.GitHub.Org == "" {
		return errors.New("github.org is required")
	}
	if cfg.Flux.RepoName == "" || cfg.Flux.ClusterPath == "" {
		return errors.New("flux repoName and clusterPath are required")
	}
	if cfg.Talos.RepoURL == "" || cfg.Talos.RepoDirName == "" {
		return errors.New("talos repoUrl and repoDirName are required")
	}
	if cfg.Talos.TerraformDir == "" || cfg.Talos.GeneratedDir == "" || cfg.Talos.ConfigFileName == "" {
		return errors.New("talos terraformDir, generatedDir, and configFileName are required")
	}
	if cfg.Talos.Proxmox.APIURL == "" || cfg.Talos.Proxmox.APIToken == "" {
		return errors.New("talos proxmox apiUrl and apiToken are required")
	}
	if cfg.Talos.Cluster.Name == "" || cfg.Talos.Cluster.Domain == "" {
		return errors.New("talos cluster name and domain are required")
	}
	if cfg.Talos.Image.FactorySchematicID == "" || cfg.Talos.Image.TalosVersion == "" || cfg.Talos.Image.TalosISOFile == "" {
		return errors.New("talos image pins are required")
	}
	if cfg.Talos.Image.UpdateMode != "" && cfg.Talos.Image.UpdateMode != "manual" && cfg.Talos.Image.UpdateMode != "download" {
		return errors.New("talos image updateMode must be manual or download")
	}
	if len(cfg.Talos.Nodes) == 0 {
		return errors.New("at least one talos node is required")
	}
	return nil
}