package appstate

import (
	"fmt"
	"strings"

	"git.julianfamily.org/keepassgo/internal/vault"
)

type SyncMode string

const (
	SyncModeManual              SyncMode = "manual"
	SyncModeAutomaticOnOpenSave SyncMode = "automatic_on_open_save"
)

type RemoteBinding struct {
	LocalVaultPath    string   `json:"localVaultPath"`
	RemoteProfileID   string   `json:"remoteProfileId"`
	CredentialEntryID string   `json:"credentialEntryId"`
	SyncMode          SyncMode `json:"syncMode,omitempty"`
}

type ResolvedRemoteBinding struct {
	Profile     vault.RemoteProfile
	Credentials vault.Entry
}

type RemoteBindingInput struct {
	LocalVaultPath    string
	RemoteProfileID   string
	RemoteProfileName string
	BaseURL           string
	RemotePath        string
	CredentialEntryID string
	CredentialTitle   string
	Username          string
	Password          string
	CredentialPath    []string
	SyncMode          SyncMode
}

func (b RemoteBinding) Resolve(model vault.Model) (ResolvedRemoteBinding, error) {
	profile, err := model.RemoteProfileByID(b.RemoteProfileID)
	if err != nil {
		return ResolvedRemoteBinding{}, fmt.Errorf("resolve remote profile: %w", err)
	}
	credentials, err := model.EntryByID(b.CredentialEntryID)
	if err != nil {
		return ResolvedRemoteBinding{}, fmt.Errorf("resolve remote credentials: %w", err)
	}
	return ResolvedRemoteBinding{
		Profile:     profile,
		Credentials: credentials,
	}, nil
}

func ConfigureRemoteBinding(model *vault.Model, input RemoteBindingInput) (RemoteBinding, error) {
	if model == nil {
		return RemoteBinding{}, fmt.Errorf("model is required")
	}

	input.LocalVaultPath = strings.TrimSpace(input.LocalVaultPath)
	input.RemoteProfileID = strings.TrimSpace(input.RemoteProfileID)
	input.RemoteProfileName = strings.TrimSpace(input.RemoteProfileName)
	input.BaseURL = strings.TrimSpace(input.BaseURL)
	input.RemotePath = strings.TrimSpace(input.RemotePath)
	input.CredentialEntryID = strings.TrimSpace(input.CredentialEntryID)
	input.CredentialTitle = strings.TrimSpace(input.CredentialTitle)
	input.Username = strings.TrimSpace(input.Username)

	switch {
	case input.LocalVaultPath == "":
		return RemoteBinding{}, fmt.Errorf("local vault path is required")
	case input.RemoteProfileID == "":
		return RemoteBinding{}, fmt.Errorf("remote profile id is required")
	case input.BaseURL == "":
		return RemoteBinding{}, fmt.Errorf("remote base URL is required")
	case input.RemotePath == "":
		return RemoteBinding{}, fmt.Errorf("remote path is required")
	case input.CredentialEntryID == "":
		return RemoteBinding{}, fmt.Errorf("credential entry id is required")
	case input.Password == "":
		return RemoteBinding{}, fmt.Errorf("credential password is required")
	}

	if input.RemoteProfileName == "" {
		input.RemoteProfileName = input.RemoteProfileID
	}
	if input.CredentialTitle == "" {
		input.CredentialTitle = "Remote Sign-In"
	}

	model.UpsertRemoteProfile(vault.RemoteProfile{
		ID:      input.RemoteProfileID,
		Name:    input.RemoteProfileName,
		Backend: vault.RemoteBackendWebDAV,
		BaseURL: input.BaseURL,
		Path:    input.RemotePath,
	})
	model.UpsertEntry(vault.Entry{
		ID:       input.CredentialEntryID,
		Title:    input.CredentialTitle,
		Username: input.Username,
		Password: input.Password,
		URL:      input.BaseURL,
		Path:     append([]string(nil), input.CredentialPath...),
	})

	return RemoteBinding{
		LocalVaultPath:    input.LocalVaultPath,
		RemoteProfileID:   input.RemoteProfileID,
		CredentialEntryID: input.CredentialEntryID,
		SyncMode:          normalizeSyncMode(input.SyncMode),
	}, nil
}

func RemoveRemoteBinding(model *vault.Model, binding RemoteBinding) error {
	if model == nil {
		return fmt.Errorf("model is required")
	}
	if strings.TrimSpace(binding.RemoteProfileID) == "" {
		return fmt.Errorf("remote profile id is required")
	}
	if strings.TrimSpace(binding.CredentialEntryID) == "" {
		return fmt.Errorf("credential entry id is required")
	}

	model.RemoveRemoteProfileByID(binding.RemoteProfileID)
	model.RemoveEntryByID(binding.CredentialEntryID)
	return nil
}

func normalizeSyncMode(mode SyncMode) SyncMode {
	switch mode {
	case SyncModeAutomaticOnOpenSave:
		return SyncModeAutomaticOnOpenSave
	default:
		return SyncModeManual
	}
}