package space_worker

import (
	"bytes"
	_ "embed"
	"fmt"
	"os"
	"os/exec"
	"path/filepath"
	"playbookctl/internal/types"
	"playbookctl/internal/utils"
	"playbookctl/internal/utils/logger"
	"slices"
	"strings"
)

var (
	//go:embed static/README.MD
	staticReadme []byte
)

type SpaceWorker struct {
	log *logger.Logger

	// Рабочая папка
	workDir string

	AnsibleBin     string
	AnsibleVerbose uint8
}

func NewSpaceWorker(verbose logger.LogVerbose, workDir string) *SpaceWorker {
	return &SpaceWorker{
		log:     &logger.Logger{Verbose: verbose},
		workDir: workDir,
	}
}

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

func (app *SpaceWorker) CreateRole(name string) error {
	app.log.Debug(fmt.Sprintf("workDir: %s", app.workDir))
	app.log.Debug(fmt.Sprintf("role name: %s", name))

	rolePath := filepath.Join(app.workDir, "roles", name)
	app.log.Debug(fmt.Sprintf("rolePath: %s", rolePath))

	app.log.Trace(fmt.Sprintf("try create '%s' dir", name))
	if err := os.Mkdir(rolePath, 0755); os.IsExist(err) {
		app.log.Warn(fmt.Sprintf("Папка \"%s\" уже существует", name))
		return nil
	}

	for _, dir := range []string{"defaults", "files", "tasks", "templates", "vars"} {
		app.log.Trace(fmt.Sprintf("try create %s/%s dir", name, dir))
		if err := utils.CreateDir(filepath.Join(rolePath, dir)); err != nil {
			return err
		}
	}

	for _, dir := range []string{"defaults", "vars"} {
		app.log.Trace(fmt.Sprintf("try create %s/%s/main.yml", name, dir))
		if err := utils.WriteEmptyYaml(filepath.Join(rolePath, dir, "main.yml")); err != nil {
			return err
		}
	}

	{ // tasks dir
		app.log.Trace("generate main task")
		if err := generateMainTask(name, rolePath); err != nil {
			return err
		}

		app.log.Trace("create install task")
		if err := utils.WriteEmptyYaml(filepath.Join(rolePath, "tasks", "install.yml")); err != nil {
			return err
		}
	}

	app.log.Trace("generate readme")
	if err := generateReadme(name, rolePath); err != nil {
		return err
	}

	app.log.Trace("read playbook.yml")
	playbook, err := types.ReadPlaybook(app.workDir)
	if err != nil {
		return err
	}

	app.log.Trace("append role to playbook.yml")
	playbook.Roles = append(playbook.Roles, name)

	app.log.Trace("write playbook.yml")
	if err := types.WritePlaybook(app.workDir, playbook); err != nil {
		return err
	}

	app.log.Info(fmt.Sprintf("Роль %s создана", name))
	return nil
}

func generateMainTask(name string, path string) error {
	buffer := &bytes.Buffer{}

	buffer.WriteString(utils.YamlHeader())
	buffer.WriteString(`- include_tasks: install.yml
  when: >
    (dd_install is defined and dd_install)
`)
	buffer.WriteString(fmt.Sprintf("    or (dd_install_%s is defined and dd_install_%s)\n", name, name))

	return os.WriteFile(filepath.Join(path, "tasks", "main.yml"), buffer.Bytes(), 0644)
}

func generateReadme(name string, path string) error {
	buffer := &bytes.Buffer{}

	buffer.WriteString(fmt.Sprintf("# %s\n\n", name))
	buffer.Write(staticReadme)

	return os.WriteFile(filepath.Join(path, "README.MD"), buffer.Bytes(), 0644)
}

//--------------------------------------------------------------------------------------------------------------------//

func (app SpaceWorker) RemoveRole(name string) error {
	app.log.Debug(fmt.Sprintf("workDir: %s", app.workDir))
	app.log.Debug(fmt.Sprintf("role name: %s", name))

	rolePath := filepath.Join(app.workDir, "roles", name)
	app.log.Debug(fmt.Sprintf("rolePath: %s", rolePath))

	app.log.Trace(fmt.Sprintf("try remove '%s' dir", name))
	if err := os.RemoveAll(rolePath); err != nil {
		return err
	}

	app.log.Trace("read playbook.yml")
	playbook, err := types.ReadPlaybook(app.workDir)
	if err != nil {
		return err
	}

	app.log.Trace("remove role from playbook.yml")
	idx := slices.Index(playbook.Roles, name)
	if idx >= 0 {
		playbook.Roles = slices.Delete(playbook.Roles, idx, idx+1)
	}

	app.log.Trace("write playbook.yml")
	if err := types.WritePlaybook(app.workDir, playbook); err != nil {
		return err
	}

	app.log.Info(fmt.Sprintf("Роль %s удалена", name))
	return nil
}

func (app *SpaceWorker) ListRoles() error {
	app.log.Debug(fmt.Sprintf("workDir: %s", app.workDir))

	app.log.Trace("try read playbook.yml")
	playbook, err := types.ReadPlaybook(app.workDir)
	if err != nil {
		return err
	}

	fmt.Println("Доступные роли:")
	for _, roleName := range playbook.Roles {
		fmt.Printf(" - %s\n", roleName)
	}

	return nil
}

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

func (app *SpaceWorker) Install(generateOnly bool, roles ...string) error {
	app.log.Debug(fmt.Sprintf("workDir: %s", app.workDir))
	ansibleArgs := setupAnsibleArgs(app.AnsibleVerbose, roles)

	command := exec.Command(app.AnsibleBin, ansibleArgs...)
	command.Dir = app.workDir
	command.Stdin = os.Stdin
	command.Stdout = os.Stdout
	command.Stderr = os.Stderr

	if generateOnly {
		fmt.Println(strings.Join(command.Args, " "))
	} else {
		app.log.Debug(fmt.Sprintf("ansible command line: %s", command.Args))
		_ = command.Run()
	}

	return nil
}

func setupAnsibleArgs(verbose uint8, roles []string) []string {
	var ansibleArgs []string

	switch verbose {
	case 1:
		ansibleArgs = append(ansibleArgs, "-v")
	case 2:
		ansibleArgs = append(ansibleArgs, "-vv")
	case 3:
		ansibleArgs = append(ansibleArgs, "-vvv")
	}

	ansibleArgs = append(ansibleArgs, "-i", "hosts.yml")

	if len(roles) > 0 {
		for _, role := range roles {
			ansibleArgs = append(ansibleArgs, "--extra-vars", fmt.Sprintf("dd_install_%s=true", role))
		}
	} else {
		ansibleArgs = append(ansibleArgs, "--extra-vars", "dd_install=true")
	}

	return append(ansibleArgs, "playbook.yml")
}

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

func (app *SpaceWorker) ListHosts() error {
	app.log.Debug(fmt.Sprintf("workDir: %s", app.workDir))

	app.log.Trace("try read hosts.yml")
	hosts, err := types.ReadHosts(app.workDir)
	if err != nil {
		return err
	}

	fmt.Println("Хосты:")
	for serverName, props := range *hosts {
		fmt.Printf(" - %s [%s:%d] (%s)\n", serverName, props.Host, props.Port, props.User)
	}

	return nil
}

func (app *SpaceWorker) HostsAdd(name string, host string, port uint16, user string) error {
	app.log.Debug(fmt.Sprintf("workDir: %s", app.workDir))

	app.log.Trace("try read hosts.yml")
	hosts, err := types.ReadHosts(app.workDir)
	if err != nil {
		return err
	}

	app.log.Trace("append new host to hosts.yml")
	(*hosts)[name] = types.THostProps{
		Host:        host,
		Port:        port,
		User:        user,
		Interpreter: types.DefaultInterpreter,
	}

	app.log.Trace("write hosts.yml")
	if err := types.WriteHosts(app.workDir, hosts); err != nil {
		return err
	}

	app.log.Trace(fmt.Sprintf("create vars/%s.vars.yml", name))
	err = utils.WriteEmptyYaml(filepath.Join(app.workDir, "vars", fmt.Sprintf("%s.vars.yml", name)))
	if err != nil {
		return err
	}

	app.log.Info("Новый хост добавлен")
	return nil
}

func (app *SpaceWorker) HostRemove(name string) error {
	app.log.Debug(fmt.Sprintf("workDir: %s", app.workDir))

	app.log.Trace("try read hosts.yml")
	hosts, err := types.ReadHosts(app.workDir)
	if err != nil {
		return err
	}

	app.log.Trace("remove host from hosts.yml")
	delete(*hosts, name)

	app.log.Trace("write hosts.yml")
	if err := types.WriteHosts(app.workDir, hosts); err != nil {
		return err
	}

	app.log.Trace(fmt.Sprintf("remove vars/%s.vars.yml", name))
	err = utils.RemoveFile(filepath.Join(app.workDir, "vars", fmt.Sprintf("%s.vars.yml", name)))
	if err != nil {
		return err
	}

	app.log.Info("Хост удалён")
	return nil
}

func (app *SpaceWorker) SetDefaultHost(name string) error {
	app.log.Debug(fmt.Sprintf("workDir: %s", app.workDir))

	app.log.Trace("try read playbook.yml")
	playbook, err := types.ReadPlaybook(app.workDir)
	if err != nil {
		return err
	}

	app.log.Trace("set default host")
	playbook.Hosts = name

	app.log.Trace("write playbook.yml")
	if err := types.WritePlaybook(app.workDir, playbook); err != nil {
		return err
	}

	app.log.Info(fmt.Sprintf("Хост '%s' установлен по-умолчанию", name))
	return nil
}