// 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"
)

// startAllServers attempts to start every server in 'sites_dir'
func startAllServers(sites_dir string) DeployError {
	files, err := os.ReadDir(sites_dir)
	if err != nil {
		return newDeployError(1, "startAllServers",
			fmt.Sprintf("Failed to read sites from '%s'", sites_dir), fmt.Sprint(err))
	}
	for _, file := range files {
		if !file.IsDir() {
			continue
		}
		err := startServer(file.Name())
		if err.code != 0 {
			return err
		}
	}

	return DeployError{}
}

// startServer attempts to start a Lapis server in the given repository.
func startServer(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, "startServer", fmt.Sprintf("Failed to start Lapis server in repository '%s'", name), "")
	}
	go func() {
		cmd.Wait()
	}()
	
	return DeployError{}
}

// restartServer attempts to restart the Lapis server in the given repository.
func restartServer(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, "restartServer", 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, "restartServer", "'lapis build' command returned unexpected value! (Lapis server not running?)", string(out))
	}
	return DeployError{}
}

// pullRepo attempts to pull or clone a repository using the given name and url
func pullRepo(url string, name string) DeployError  {	
	exists, err := fileExists(configuration.sites_dir+"/"+name)
	if err != nil {
		return newDeployError(1, "fileExists",
			fmt.Sprintf("Failed to check whether folder '%s' exists while pulling down repository '%s'!", name, name), "")
	}
	if !exists {
		log.Printf("Cloning repository %s...", name)
		if err = git.Clone(url, configuration.sites_dir+"/"+name); err != nil {
			return newDeployError(1, "pullRepo", fmt.Sprintf("Failed to pull down repository '%s'", name), "")
		}
		if err := startServer(name); err.code != 0 {
			return err
		}
	} else {
		log.Printf("Pulling down repository %s...", name)
		repo,err := git.Open(configuration.sites_dir+"/"+name)
		if err != nil {
			return newDeployError(1, "pullRepo", fmt.Sprintf("Failed to open git repository '%s'", name), "")
		}
		repo.Pull()
	}
	return DeployError{}
}