package account

import (
	"arimelody-web/model"
	"database/sql"
	"errors"
	"strconv"
)

type (
    AccountRepositoryMemory struct {
        accounts []*model.Account
    }
)

var _ AccountRepository = new(AccountRepositoryMemory)

func NewAccountRepositoryMemory() *AccountRepositoryMemory {
    return &AccountRepositoryMemory{ accounts: make([]*model.Account, 0) }
}

func (repo *AccountRepositoryMemory) GetAll() ([]*model.Account, error) {
    return repo.accounts, nil
}
func (repo *AccountRepositoryMemory) GetCount() (int, error) {
    return len(repo.accounts), nil
}
func (repo *AccountRepositoryMemory) GetByID(id string) (*model.Account, error) {
    for _, account := range repo.accounts {
        if account.ID == id { return account, nil }
    }
    return nil, nil
}
func (repo *AccountRepositoryMemory) GetByUsername(username string) (*model.Account, error) {
    for _, account := range repo.accounts {
        if account.Username == username { return account, nil }
    }
    return nil, nil
}
func (repo *AccountRepositoryMemory) GetByEmail(email string) (*model.Account, error) {
    for _, account := range repo.accounts {
        if account.Email.Valid && account.Email.String == email {
            return account, nil
        }
    }
    return nil, nil
}

// Create an account, returning the new account ID.
func (repo *AccountRepositoryMemory) Create(username string, password string, email *string, avatarURL *string) (string, error) {
    if account, err := repo.GetByUsername(username); err != nil {
        return "", errors.New("Failed to fetch other acccounts by username")
    } else if account != nil {
        return "", errors.New("Account with this username already exists")
    }

    emailRef := ""
    if email != nil { emailRef = *email }
    avatarURLRef := ""
    if avatarURL != nil { avatarURLRef = *avatarURL }

    id := strconv.Itoa(len(repo.accounts))

    repo.accounts = append(repo.accounts, &model.Account{
        ID: id,
        Username: username,
        Password: password,
        Email: sql.NullString{ String: emailRef, Valid: email != nil },
        AvatarURL: sql.NullString{ String: avatarURLRef, Valid: avatarURL != nil },
    })

    return id, nil
}

// Intended for large profile updates. For smaller adjusments,
// more specialised Change* and Remove* functions should be used.
func (repo *AccountRepositoryMemory) Update(id string, username string, password string, email *string, avatarUrl *string) error {
    if account, err := repo.GetByUsername(username); err != nil {
        return errors.New("Failed to fetch other acccounts by username")
    } else if account != nil && account.ID != id {
        return errors.New("Account with this username already exists")
    }

    account, err := repo.GetByID(id)
    if err != nil { return err }

    account.Username = username
    account.Password = password
    account.Email.Valid = email != nil
    if account.Email.Valid { account.Email.String = *email }
    account.AvatarURL.Valid = avatarUrl != nil
    if account.AvatarURL.Valid { account.AvatarURL.String = *avatarUrl }

    return nil
}
func (repo *AccountRepositoryMemory) ChangeUsername(id string, username string) error {
    if account, err := repo.GetByUsername(username); err != nil {
        return errors.New("Failed to fetch other acccounts by username")
    } else if account != nil && account.ID != id {
        return errors.New("Account with this username already exists")
    }
    account, err := repo.GetByID(id)
    if err != nil { return err }
    account.Username = username
    return nil
}
func (repo *AccountRepositoryMemory) ChangePassword(id string, password string) error {
    account, err := repo.GetByID(id)
    if err != nil { return err }
    account.Password = password
    return nil
}
func (repo *AccountRepositoryMemory) ChangeEmail(id string, email string) error {
    account, err := repo.GetByID(id)
    if err != nil { return err }
    account.Email.Valid = true
    account.Email.String = email
    return nil
}
func (repo *AccountRepositoryMemory) RemoveEmail(id string) error {
    account, err := repo.GetByID(id)
    if err != nil { return err }
    account.Email.Valid = false
    account.Email.String = ""
    return nil
}
func (repo *AccountRepositoryMemory) ChangeAvatarURL(id string, avatarURL string) error {
    account, err := repo.GetByID(id)
    if err != nil { return err }
    account.AvatarURL.Valid = true
    account.AvatarURL.String = avatarURL
    return nil
}
func (repo *AccountRepositoryMemory) RemoveAvatar(id string) error {
    account, err := repo.GetByID(id)
    if err != nil { return err }
    account.AvatarURL.Valid = false
    account.AvatarURL.String = ""
    return nil
}

func (repo *AccountRepositoryMemory) Delete(id string) error {
    accountIndex := -1
    for index, account := range repo.accounts {
        if account.ID == id {
            accountIndex = index
            break
        }
    }
    if accountIndex == -1 { return nil }

    repo.accounts = append(
        repo.accounts[:accountIndex],
        repo.accounts[accountIndex+1:]...,
    )

    return nil
}

// Increment the number of account login failure attempts,
// returning the current fail count.
func (repo *AccountRepositoryMemory) IncrementFails(id string) (int, error) {
    account, err := repo.GetByID(id)
    if err != nil { return 0, err }
    account.FailAttempts += 1
    return account.FailAttempts, nil
}
func (repo *AccountRepositoryMemory) ResetFails(id string) error {
    account, err := repo.GetByID(id)
    if err != nil { return err }
    account.FailAttempts = 0
    return nil
}
func (repo *AccountRepositoryMemory) Lock(id string) error {
    account, err := repo.GetByID(id)
    if err != nil { return err }
    account.Locked = true
    return nil
}
func (repo *AccountRepositoryMemory) Unlock(id string) error {
    account, err := repo.GetByID(id)
    if err != nil { return err }
    account.Locked = false
    return nil
}