// package main is the main package for the LapisDeploy program
package main

import (
	"os/exec"
	"strings"
	"syscall"
	"log"
	"os"
	"fmt"

	"github.com/gogs/git-module"
)

// getAllSites gets every site installed
func getAllSites() ([]string, DeployError) {
	sites_dir := configuration.sites_dir
	files, err := os.ReadDir(sites_dir)
	var sites []string
	if err != nil {
		return sites, newDeployError(1, "startAllSites", fmt.Sprintf("Failed to read sites from '%s'", sites_dir), fmt.Sprint(err))
	}
	for _, file := range files {
		if !file.IsDir() {
			continue
		}
		sites = append(sites, file.Name())
	}
	return sites, DeployError{}
}

// startAllSites attempts to start every site
func startAllSites() DeployError {
	sites, err := getAllSites()
	if err.code != 0 {
		return err
	}
	for _, site := range sites {
		err := startSite(site)
		if err.code != 0 {
			return err
		}
	}
	return DeployError{}
}

// startSite attempts to start a Lapis server in the given repository.
func startSite(name string) DeployError {
	log.Printf("Starting Lapis server in repository %s...", name)

	old_cwd, _ := os.Getwd()
	defer syscall.Chdir(old_cwd)
	syscall.Chdir(configuration.sites_dir+"/"+name)

	cmd := exec.Command("lapis", "serve")
	if err := cmd.Start(); err != nil {
		return newDeployError(1, "startSite", fmt.Sprintf("Failed to start Lapis server in repository '%s'", name), "")
	}
	go func() {
		cmd.Wait()
	}()
	
	return DeployError{}
}

// restartSite attempts to restart the Lapis server in the given repository.
func restartSite(name string) DeployError {
	log.Printf("Restarting Lapis server on repository %s...", name)

	old_cwd, _ := os.Getwd()
	defer syscall.Chdir(old_cwd)
	syscall.Chdir(configuration.sites_dir+"/"+name)

	out, err := exec.Command("lapis", "build").CombinedOutput()
	if err != nil {
		return newDeployError(1, "restartSite", fmt.Sprintf("Failed to run 'lapis build' in repository '%s'", name), string(out))
	}
	log.Printf("[lapis build] %s", out)
	if !strings.Contains(string(out), "HUP") {
		return newDeployError(1, "restartSite", "'lapis build' command returned unexpected value! (Lapis server not running?)", string(out))
	}
	return DeployError{}
}

// updateSite attempts to pull or clone a repository using the given name and url
func updateSite(name string) DeployError  {	
	log.Printf("Pulling down repository %s...", name)
	repo,err := git.Open(configuration.sites_dir+"/"+name)
	if err != nil {
		return newDeployError(1, "updateSite", fmt.Sprintf("Failed to open git repository '%s'", name), fmt.Sprint(err))
	}
	if err = repo.Pull(); err != nil {
		return newDeployError(1, "updateSite", fmt.Sprintf("Failed to pull down git repository '%s'", name), fmt.Sprint(err))
	}
	return DeployError{}
}

// cloneSite
func cloneSite(url string, name string) DeployError {
	log.Printf("Cloning repository %s...", name)
	if err := git.Clone(url, configuration.sites_dir+"/"+name); err != nil {
		return newDeployError(1, "cloneSite", fmt.Sprintf("Failed to pull down repository '%s'", name), fmt.Sprint(err))
	}
	return DeployError{}
}