package main

import (
	"database/sql"
	"database/sql/driver"
	"encoding/json"
	"errors"
	"log"
	"os"

	_ "acudego"
)

type Tag struct {
	Name  string `json:"name"`
	Place string `json:"place"`
}

func (t *Tag) Scan(value interface{}) error {
	return json.Unmarshal([]byte(value.(string)), t)
}

func (t *Tag) Value() (driver.Value, error) {
	b, err := json.Marshal(t)
	return string(b), err
}

func main() {
	os.Remove("json.db")
	defer os.Remove("json.db")

	db, err := sql.Open("acudego", "json.db")
	if err != nil {
		log.Fatal(err)
	}
	defer db.Close()

	_, err = db.Exec(`create table myjsontable (tag jsonb)`)
	if err != nil {
		log.Fatal(err)
	}

	stmt, err := db.Prepare("insert into myjsontable(tag) values(?)")
	if err != nil {
		log.Fatal(err)
	}
	defer stmt.Close()

	_, err = stmt.Exec(`{"name": "name1", "place": "right-here"}`)
	if err != nil {
		log.Fatal(err)
	}

	_, err = stmt.Exec(`{"name": "michael", "place": "usa"}`)
	if err != nil {
		log.Fatal(err)
	}

	var place string
	err = db.QueryRow("select tag->>'place' from myjsontable where tag->>'name' = 'name1'").Scan(&place)
	if err != nil {
		log.Fatal(err)
	}

	if place != "right-here" {
		log.Fatal(errors.New("expected right-here, got: " + place))
	}

	var tag Tag
	err = db.QueryRow("select tag from myjsontable where tag->>'name' = 'name1'").Scan(&tag)
	if err != nil {
		log.Fatal(err)
	}

	if tag.Name != "name1" {
		log.Fatal(errors.New("expected name1, got: " + tag.Name))
	}
	if tag.Place != "right-here" {
		log.Fatal(errors.New("expected right-here, got: " + tag.Place))
	}

	tag.Place = "日本"
	_, err = db.Exec(`update myjsontable set tag = ? where tag->>'name' == 'name1'`, &tag)
	if err != nil {
		log.Fatal(err)
	}

	err = db.QueryRow("select tag->>'place' from myjsontable where tag->>'name' = 'name1'").Scan(&place)
	if err != nil {
		log.Fatal(err)
	}

	if place != "日本" {
		log.Fatal(errors.New("expected 日本, got: " + place))
	}
}