package models

import (
	"bytes"
	"database/sql/driver"
	"encoding/json"
	"fmt"
	"net/http"
)

type Config map[string]string

func (c *Config) Validate() error {
	return nil
}

// implements sql.Valuer, returning a string
func (c Config) Value() (driver.Value, error) {
	if len(c) < 1 {
		return driver.Value(string("")), nil
	}
	var b bytes.Buffer
	err := json.NewEncoder(&b).Encode(c)
	// return a string type
	return driver.Value(b.String()), err
}

// implements sql.Scanner
func (c *Config) Scan(value interface{}) error {
	if value == nil {
		*c = nil
		return nil
	}
	bv, err := driver.String.ConvertValue(value)
	if err == nil {
		var b []byte
		switch x := bv.(type) {
		case []byte:
			b = x
		case string:
			b = []byte(x)
		}

		if len(b) > 0 {
			return json.Unmarshal(b, c)
		} else {
			*c = nil
			return nil
		}
	}

	// otherwise, return an error
	return fmt.Errorf("config invalid db format: %T %T value, err: %v", value, bv, err)
}

// Headers is an http.Header that implements additional methods.
type Headers http.Header

// implements sql.Valuer, returning a string
func (h Headers) Value() (driver.Value, error) {
	if len(h) < 1 {
		return driver.Value(string("")), nil
	}
	var b bytes.Buffer
	err := json.NewEncoder(&b).Encode(h)
	// return a string type
	return driver.Value(b.String()), err
}

// implements sql.Scanner
func (h *Headers) Scan(value interface{}) error {
	if value == nil {
		*h = nil
		return nil
	}
	bv, err := driver.String.ConvertValue(value)
	if err == nil {
		var b []byte
		switch x := bv.(type) {
		case []byte:
			b = x
		case string:
			b = []byte(x)
		}

		if len(b) > 0 {
			return json.Unmarshal(b, h)
		} else {
			*h = nil
			return nil
		}
	}

	// otherwise, return an error
	return fmt.Errorf("headers invalid db format: %T %T value, err: %v", value, bv, err)
}