package postgres

import (
	_ "github.com/lib/pq"

	"bytes"
	"database/sql"
	"text/template"

	"github.com/kcotugno/tacitus"
)

const connStr = `host={{.Host}} dbname={{.Name}} port={{.Port}} user={{.User}} ` +
	`password={{.Password}} sslmode={{.SslMode}}`

type Client struct {
	Host      string
	Port      int
	Name      string
	User      string
	SslMode   string
	Password string

	tradeService        TradeService
	confirmationService ConfirmationService
	aggregationService  AggregationService

	logger tacitus.Logger
	db     *sql.DB
}

func NewClient() *Client {
	c := Client{}
	c.tradeService.client = &c
	c.confirmationService.client = &c
	c.aggregationService.client = &c

	c.Host = "localhost"
	c.Port = 5432
	c.Name = "postgres"
	c.User = "postgres"
	c.Password = `""`
	c.SslMode = "disable"

	return &c
}

func (c *Client) SetLogger(logger tacitus.Logger) {
	c.logger = logger
}

func (c *Client) Open() error {
	buf := bytes.Buffer{}
	tmpl, _ := template.New("conn").Parse(connStr)
	tmpl.Execute(&buf, c)

	db, err := sql.Open("postgres", buf.String())
	if err != nil {
		c.log(`Failed to connect to postgres. params=%v`, buf.String())
		return err
	}

	if err = db.Ping(); err != nil {
		c.log(`Failed to connect to postgres. params=%v`, buf.String())
		return err
	}
	c.log(`Conntected to postgres. params="%v"`, buf.String())

	c.db = db
	return nil
}

func (c *Client) Close() error {
	err := c.db.Close()
	c.log("Closed postgres connection")
	return err
}

func (c *Client) TradeService() tacitus.TradeService {
	return &c.tradeService
}

func (c *Client) ConfirmationService() tacitus.ConfirmationService {
	return &c.confirmationService
}

func (c *Client) AggregationService() tacitus.AggregationService {
	return &c.aggregationService
}

func (c *Client) log(format string, params ...interface{}) {
	if c.logger != nil {
		c.logger.Info(format, params...)
	}
}

func (c *Client) logQuery(sql string, params ...interface{}) {
	c.log(`SQL query="%v" params="%v"`, sql, params)
}

func (c *Client) logError(sql string, err error, params ...interface{}) {
	c.log(`SQL FAIL query="%v" params="%v" error="%v"`, sql, params, err)
}