package store

import (
	"encoding/json"

	"gorm.io/datatypes"
	"gorm.io/gorm"

	"spider/internal/model"
)

// GetSetting reads a setting by key. Returns nil if not found.
func (s *Store) GetSetting(key string) (*model.Setting, error) {
	var setting model.Setting
	err := s.DB.Where("`key` = ?", key).First(&setting).Error
	if err == gorm.ErrRecordNotFound {
		return nil, nil
	}
	return &setting, err
}

// SetSetting creates or updates a setting.
func (s *Store) SetSetting(key string, value any) error {
	data, err := json.Marshal(value)
	if err != nil {
		return err
	}

	var existing model.Setting
	err = s.DB.Where("`key` = ?", key).First(&existing).Error
	if err == gorm.ErrRecordNotFound {
		return s.DB.Create(&model.Setting{
			Key:   key,
			Value: datatypes.JSON(data),
		}).Error
	}
	if err != nil {
		return err
	}
	return s.DB.Model(&existing).Update("value", datatypes.JSON(data)).Error
}

// GetAPIKeysConfig reads the API keys config from settings.
func (s *Store) GetAPIKeysConfig() (*model.APIKeysConfig, error) {
	setting, err := s.GetSetting("api_keys")
	if err != nil {
		return nil, err
	}
	if setting == nil {
		return &model.APIKeysConfig{}, nil
	}
	var cfg model.APIKeysConfig
	if err := json.Unmarshal(setting.Value, &cfg); err != nil {
		return &model.APIKeysConfig{}, nil
	}
	return &cfg, nil
}

// GetGradingConfig reads the grading config from settings, or returns default.
func (s *Store) GetGradingConfig() (*model.GradingConfig, error) {
	setting, err := s.GetSetting("grading")
	if err != nil {
		return nil, err
	}
	if setting == nil {
		cfg := model.DefaultGradingConfig()
		return &cfg, nil
	}
	var cfg model.GradingConfig
	if err := json.Unmarshal(setting.Value, &cfg); err != nil {
		cfg = model.DefaultGradingConfig()
		return &cfg, nil
	}
	return &cfg, nil
}