package templater

import (
	"fmt"
	"io/ioutil"
	"log"
	"os"

	"github.com/imdario/mergo"
)

var CacheFilePath = "/var/cache/templater.db"

type TemplaterConfig struct {
	Name              string             `json:"Name"`
	TemplateDirectory string             `json:"TemplateDirectory"`
	RootDirectory     string             `json:"RootDirectory"`
	Services          map[string]Service `json:"Services"`
	GlobalService     Service            `json:"Globals"`
}

func (tc *TemplaterConfig) loadCache() error {
	// Load globals from cache
	var cache Service
	err := Load(CacheFilePath, &cache)
	if err != nil {
		fmt.Printf("Warning: No globals to load\n")
	}

	err = mergo.Merge(&tc.GlobalService, cache)
	if err != nil {
		return err
	}
	return nil
}

// Create new configuration "object"
func (tc *TemplaterConfig) New(confpath string, templateDir string, rootDir string) error {
	// Load stored globals if needed
	lerr := tc.loadCache()
	if lerr != nil {
		return lerr
	}
	// Check if the configuration path is a Directory or a file
	fileInfo, err := os.Stat(confpath)
	if err != nil {
		return err
	}

	if fileInfo.IsDir() {
		// The conf path is a directory we load all the files and merge data
		files, err := ioutil.ReadDir(confpath)
		if err != nil {
			return fmt.Errorf("Templater configuration load failed with error: %v", err)
		}
		for _, file := range files {
			fname := fmt.Sprintf("%s/%s", confpath, file.Name())
			var ntc TemplaterConfig
			err := Load(fname, &ntc)
			if err != nil {
				return fmt.Errorf("Templater configuration load failed with error: %v", err)
			}
			err = mergo.Merge(tc, ntc)
			if err != nil {
				return fmt.Errorf("Templater configuration load failed with error: %v", err)
			}
		}
	} else {
		// The conf path is a file we only load this file (of course)
		err = Load(confpath, tc)
		if err != nil {
			return fmt.Errorf("Confiuration read failed with error: %v", err)
		}
	}

	tc.TemplateDirectory = templateDir
	tc.RootDirectory = rootDir

	return nil
}

// Process the services contained in the configuration "object"
func (tc *TemplaterConfig) ManageServices() error {
	// Get global vars to add on each service
	gbls := tc.GlobalService.Vars

	for name, svr := range tc.Services {
		err := mergo.Merge(&svr.Vars, gbls)
		if err != nil {
			return err
		}

		log.Printf("=== Working on service %s", name)
		if err := svr.Manage(tc.TemplateDirectory, tc.RootDirectory); err != nil {
			return err
		}
		log.Printf("=== Service %s processed", name)
		log.Printf("")
	}
	return nil
}