package main

import (
	"log"
	"os"
	"os/exec"
	"strings"
	"text/template"

	"github.cmd.navi-tech.in/navi-infra/infra-provisioner/bindata"

	"github.com/Masterminds/sprig/v3"
)

const TemplatesDir = "templates"
const InitScript = "./deploy.sh"

func provisionResource(resourceName, resourceDir string, manifest *Manifest, templateOnly, plan bool) error {
	err := templateResourceTf(resourceName, resourceDir, manifest, resourceDir)
	if err != nil {
		log.Fatalf("\nErr: %v", err)
		return err
	}

	if !templateOnly {
		err = executeResourceTf(resourceDir, plan)
		if err != nil {
			log.Fatalf("\nErr: %v", err)
			return err
		}
	}

	return nil
}

func templateResourceTf(templateName, resourceDir string, manifest *Manifest, destinationDir string) error {
	log.Printf("Creating templates for %s in %s", templateName, resourceDir)

	tfFiles, err := bindata.AssetDir(strings.Join([]string{TemplatesDir, resourceDir}, "/"))
	if err != nil {
		return err
	}

	for _, tfFile := range tfFiles {
		tfBytes := bindata.MustAsset(strings.Join([]string{TemplatesDir, resourceDir, tfFile}, "/"))
		t := template.Must(template.New(templateName).Funcs(sprig.TxtFuncMap()).Parse(string(tfBytes)))

		tfOut, err := createFile(destinationDir, tfFile)
		if err != nil {
			log.Fatalf("\nErr: %v", err)
			return err
		}

		err = t.Execute(tfOut, manifest)
		if err != nil {
			log.Fatalf("\nErr: %v", err)
			return err
		}
		tfOut.Close()
	}

	return nil
}

func executeResourceTf(resourceDir string, plan bool) error {
	var cmd *exec.Cmd
	if plan {
		cmd = exec.Command(InitScript, "plan")
	} else {
		log.Printf("Running terraform for %s", resourceDir)
		cmd = exec.Command(InitScript)
	}
	cmd.Dir = resourceDir
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr
	err := cmd.Run()
	if err != nil {
		log.Fatalf("\nErr: %v", err)
		return err
	}
	return err
}