package main

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"os"

	"forge.cadoles.com/pcaseiro/templatefile/pkg/configs"
	"github.com/alexflint/go-arg"
)

func processGlobal(global configs.Service, templateDir string) error {
	fmt.Printf("\nFIXME Global %v %s\n", global, templateDir)
	return nil
}

func processConfigFiles(tpls []configs.ConfigFile, variables map[string]interface{}, templateDir string) error {
	values, err := json.Marshal(variables)
	if err != nil {
		return fmt.Errorf("Error unmarshaling values on template process; %v", err)
	}

	for _, tpl := range tpls {
		if err := tpl.Generate("/tmp/test", templateDir, values); err != nil {
			return fmt.Errorf("Template %s generation failed with error %v", tpl.Source, err)
		}

	}
	return nil
}

func processDaemons(daemon configs.SystemService) error {
	return daemon.Manage()
}

func processService(conf configs.Service, templateDir string) error {
	err := processConfigFiles(conf.ConfigFiles, conf.Vars, templateDir)
	if err != nil {
		return fmt.Errorf("ProcessingTemplatesFailed with error: %v", err)
	}

	err = processDaemons(conf.Daemon)
	if err != nil {
		return fmt.Errorf("Error managing service daemons: %v", err)
	}
	return nil
}

func processConfig(confpath string, templateDir string) (configs.TemplaterConfig, error) {
	var cnf configs.TemplaterConfig

	flContent, err := os.ReadFile(confpath)
	if err != nil {
		return cnf, fmt.Errorf("Confiuration read failed with error: %v", err)
	}

	err = json.Unmarshal(flContent, &cnf)
	if err != nil {
		return cnf, fmt.Errorf("Processing config failed with error: %v", err)
	}

	for name, svr := range cnf.Services {
		if name == "Global" {
			err = processGlobal(svr, templateDir)
			if err != nil {
				return cnf, fmt.Errorf("Error processing globals: %v", err)
			}
		} else {
			if err = processService(svr, templateDir); err != nil {
				return cnf, fmt.Errorf("Error processing service: %v", err)
			}
		}
	}

	return cnf, nil

}

func main() {

	var args struct {
		ConfigDirectory   string `arg:"-c,--config-dir,env:CONFIG_DIR" help:"Configuration values directory path" default:"./data/config"`
		ConfigFile        string `arg:"-f,--config-file,env:CONFIG_FILE" help:"Configuration file to procedss"`
		TemplateDirectory string `arg:"-t,--template-dir,env:TEMPLATE_DIR" help:"Template directory path" default:"./data/templates"`
	}

	arg.MustParse(&args)

	if args.ConfigFile != "" {
		_, err := processConfig(args.ConfigFile, args.TemplateDirectory)
		if err != nil {
			panic(err)
		}
	} else {
		files, err := ioutil.ReadDir(args.ConfigDirectory)
		if err != nil {
			panic(err)
		}
		for _, file := range files {
			fname := fmt.Sprintf("%s/%s", args.ConfigDirectory, file.Name())
			processConfig(fname, args.TemplateDirectory)
		}
	}
}