/*
 *  Copyright (c) 2026 Kaiy Ragur
 *
 *  This Source Code Form is subject to the terms of the Mozilla Public
 *  License, v. 2.0. If a copy of the MPL was not distributed with this
 *  file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */
package shell

import (
	"encoding/hex"
	"encoding/json"
	"flag"
	"fmt"
	"log"
	"os"

	"github.com/neilalexander/yggmail/internal/account"
	"github.com/neilalexander/yggmail/internal/config"
	"github.com/neilalexander/yggmail/internal/storage"
	"github.com/neilalexander/yggmail/internal/storage/types"
	"github.com/neilalexander/yggmail/internal/utils"
)

type Shell struct {
	storage storage.Storage
	account *account.Manager
	cfg     *config.Config
}

func NewShell(storage storage.Storage, log *log.Logger, cfg *config.Config) *Shell {
	return &Shell{
		storage: storage,
		account: account.NewManager(storage, log),
		cfg:     cfg,
	}
}

func passwordProvider() (string, error) {
	p, err := account.DefaultProvider("Enter password for your new mail account: ")
	if err != nil {
		return "", err
	}
	p2, err := account.DefaultProvider("Comfirm your password: ")
	if err != nil {
		return "", err
	}
	if p == p2 {
		return p2, nil
	}
	return "", fmt.Errorf("Password not match")
}

type shellCommand func(args []string) error

func (s *Shell) Run(c string, args []string) {
	// fmt.Println(c, args)
	var err error

	commands := map[string]shellCommand{
		"accountAdd":       s.accountAdd,
		"accountCreateNew": s.accountCreateNew,
		"accountGet":       s.accountGet,
		"accountList":      s.accountList,
		"accountDelete":    s.accountDelete,
		"nodeInfo":         s.getNodeInfo,
	}
	cmd, ok := commands[c]
	if !ok {
		log.Fatal("Command not found!")
		os.Exit(1)
	}
	err = cmd(args)
	if err != nil {
		fmt.Println(err)
	}
}

func (s *Shell) accountAdd(args []string) error {

	flags := flag.NewFlagSet("addAccount", flag.ExitOnError)
	// All flags
	pubkey := flags.String("pub", "", "Account public key")
	file := flags.String("f", "", "Added from file")

	flags.Parse(args)

	var (
		err error
		acc *types.Account = new(types.Account)
	)
	if *file != "" {
		cont, err := os.ReadFile(*file)
		if err != nil {
			return err
		}
		if err := json.Unmarshal(cont, acc); err != nil {
			return err
		}
		if err := s.storage.AccountCreate(acc); err != nil {
			return err
		}
		fmt.Printf("Account %s@%s added", acc.PublicKey, utils.EncodeString(s.cfg.PublicKey))
		for _, folder := range []string{"INBOX", "Outbox", "Sent", "Trash", "Drafts"} {
			s.storage.MailboxCreate(acc.PublicKey, folder)
		}
		return nil
	}

	if acc, err = s.account.AddAccount(*pubkey); err != nil {
		return err
	}
	fmt.Printf("Account %s@%s added", acc.PublicKey, utils.EncodeString(s.cfg.PublicKey))
	return nil
}

func (s *Shell) getNodeInfo(args []string) error {

	flags := flag.NewFlagSet("nodeInfo", flag.ExitOnError)
	flags.Parse(args)

	pks := utils.EncodeString(s.cfg.PublicKey)
	accList, err := s.storage.AccountList()
	if err != nil {
		return err
	}

	fmt.Println("== Node Info == ")
	fmt.Println("Address base32:", pks)
	fmt.Println("Address hex16:", hex.EncodeToString(s.cfg.PublicKey))
	fmt.Println("Accounts: ", len(accList))
	return nil
}

func (s *Shell) accountList(args []string) error {
	accList, err := s.storage.AccountList()
	if err != nil {
		return err
	}
	fmt.Println("Accounts: ", len(accList))
	for i, a := range accList {
		count, err := s.storage.MailCount(a.PublicKey, "INBOX")
		if err != nil {
			count = 0
		}
		fmt.Printf("\n| %d | %s | %s | Mails: %d", i, a.PublicKey, a.Aliases, count)
	}
	return nil
}

func (s *Shell) accountCreateNew(args []string) error {
	a, err := s.account.CreateNewAccount(passwordProvider)
	if err != nil {
		return err
	}
	fmt.Printf("Created account: %s@%s", a.PublicKey, utils.EncodeString(s.cfg.PublicKey))
	return nil
}

func (s *Shell) accountGet(args []string) error {
	flags := flag.NewFlagSet("getAccount", flag.ExitOnError)
	// All flags
	pubkey := flags.String("pub", "", "Account Publickey")
	file := flags.String("o", "", "Write to file")

	flags.Parse(args)

	var (
		err error
		acc *types.Account
	)

	if acc, err = s.account.GetAccount(*pubkey); err != nil {
		return err
	}
	b, err := json.Marshal(acc)
	if err != nil {
		return err
	}
	if *file == "" {
		fmt.Println(string(b))
	} else {
		os.WriteFile(*file, b, 0600)
		fmt.Println("Write to ", *file)
	}
	return nil
}

func (s *Shell) accountDelete(args []string) error {
	flags := flag.NewFlagSet("getAccount", flag.ExitOnError)
	// All flags
	pubkey := flags.String("pub", "", "Account Publickey")
	flags.Parse(args)

	var (
		err error
	)
	if err = s.account.DeleteAccount(*pubkey); err != nil {
		return err
	}
	return nil

}