package storage

import (
	"fmt"
	"gopkg.in/yaml.v3"
	"strings"
	"sync"
)

type PreferencesStorage struct {
	storage *localStorage
	mutex   sync.Mutex
}

func NewPreferences() *PreferencesStorage {
	return &PreferencesStorage{
		storage: NewLocalStore("preferences.yaml"),
	}
}

func (p *PreferencesStorage) DefaultPreferences() map[string]any {
	return map[string]any{
		"general": map[string]any{
			"language":       "en",
			"font":           "",
			"font_size":      14,
			"use_proxy":      false,
			"use_proxy_http": false,
			"check_update":   true,
		},
		"editor": map[string]any{
			"font":      "",
			"font_size": 14,
		},
	}
}

func (p *PreferencesStorage) getPreferences() (ret map[string]any) {
	b, err := p.storage.Load()
	if err != nil {
		ret = p.DefaultPreferences()
		return
	}

	if err := yaml.Unmarshal(b, &ret); err != nil {
		ret = p.DefaultPreferences()
		return
	}
	return
}

// GetPreferences Get preferences from local
func (p *PreferencesStorage) GetPreferences() (ret map[string]any) {
	p.mutex.Lock()
	defer p.mutex.Unlock()

	return p.getPreferences()
}

func (p *PreferencesStorage) setPreferences(pf map[string]any, key string, value any) error {
	keyPath := strings.Split(key, ".")
	if len(keyPath) <= 0 {
		return fmt.Errorf("invalid key path(%s)", key)
	}
	var node any = pf
	for _, k := range keyPath[:len(keyPath)-1] {
		if subNode, ok := node.(map[string]any); ok {
			node = subNode[k]
		} else {
			return fmt.Errorf("invalid key path(%s)", key)
		}
	}

	if subNode, ok := node.(map[string]any); ok {
		subNode[keyPath[len(keyPath)-1]] = value
	}

	return nil
}

func (p *PreferencesStorage) savePreferences(pf map[string]any) error {
	b, err := yaml.Marshal(&pf)
	if err != nil {
		return err
	}

	if err = p.storage.Store(b); err != nil {
		return err
	}
	return nil
}

// SetPreferences assign value to key path, the key path use "." to indicate multiple level
func (p *PreferencesStorage) SetPreferences(key string, value any) error {
	p.mutex.Lock()
	defer p.mutex.Unlock()

	pf := p.getPreferences()
	if err := p.setPreferences(pf, key, value); err != nil {
		return err
	}
	return p.savePreferences(pf)
}

// SetPreferencesN set multiple key path and value
func (p *PreferencesStorage) SetPreferencesN(values map[string]any) error {
	p.mutex.Lock()
	defer p.mutex.Unlock()

	pf := p.getPreferences()
	for path, v := range values {
		if err := p.setPreferences(pf, path, v); err != nil {
			return err
		}
	}

	return p.savePreferences(pf)
}

func (p *PreferencesStorage) RestoreDefault() map[string]any {
	pf := p.DefaultPreferences()
	p.savePreferences(pf)
	return pf
}