// VulcanizeDB
// Copyright © 2019 Vulcanize

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.

// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package serve

import (
	"os"
	"path/filepath"

	"github.com/spf13/viper"

	"github.com/vulcanize/ipfs-blockchain-watcher/pkg/node"
	"github.com/vulcanize/ipfs-blockchain-watcher/pkg/postgres"

	"github.com/vulcanize/ipld-eth-server/utils"
)

// Env variables
const (
	SERVER_WS_PATH   = "SERVER_WS_PATH"
	SERVER_IPC_PATH  = "SERVER_IPC_PATH"
	SERVER_HTTP_PATH = "SERVER_HTTP_PATH"

	SERVER_MAX_IDLE_CONNECTIONS = "SERVER_MAX_IDLE_CONNECTIONS"
	SERVER_MAX_OPEN_CONNECTIONS = "SERVER_MAX_OPEN_CONNECTIONS"
	SERVER_MAX_CONN_LIFETIME    = "SERVER_MAX_CONN_LIFETIME"
)

// Config struct
type Config struct {
	DB           *postgres.DB
	DBConfig     postgres.Config
	WSEndpoint   string
	HTTPEndpoint string
	IPCEndpoint  string
}

// NewConfig is used to initialize a watcher config from a .toml file
// Separate chain watcher instances need to be ran with separate ipfs path in order to avoid lock contention on the ipfs repository lockfile
func NewConfig() (*Config, error) {
	c := new(Config)

	viper.BindEnv("server.wsPath", SERVER_WS_PATH)
	viper.BindEnv("server.ipcPath", SERVER_IPC_PATH)
	viper.BindEnv("server.httpPath", SERVER_HTTP_PATH)

	c.DBConfig.Init()

	wsPath := viper.GetString("watcher.wsPath")
	if wsPath == "" {
		wsPath = "127.0.0.1:8080"
	}
	c.WSEndpoint = wsPath
	ipcPath := viper.GetString("watcher.ipcPath")
	if ipcPath == "" {
		home, err := os.UserHomeDir()
		if err != nil {
			return nil, err
		}
		ipcPath = filepath.Join(home, ".vulcanize/vulcanize.ipc")
	}
	c.IPCEndpoint = ipcPath
	httpPath := viper.GetString("watcher.httpPath")
	if httpPath == "" {
		httpPath = "127.0.0.1:8081"
	}
	c.HTTPEndpoint = httpPath
	overrideDBConnConfig(&c.DBConfig)
	serveDB := utils.LoadPostgres(c.DBConfig, postgres.Info{})
	c.DB = &serveDB

	return c, nil
}

func overrideDBConnConfig(con *postgres.Config) {
	viper.BindEnv("database.server.maxIdle", SERVER_MAX_IDLE_CONNECTIONS)
	viper.BindEnv("database.server.maxOpen", SERVER_MAX_OPEN_CONNECTIONS)
	viper.BindEnv("database.server.maxLifetime", SERVER_MAX_CONN_LIFETIME)
	con.MaxIdle = viper.GetInt("database.server.maxIdle")
	con.MaxOpen = viper.GetInt("database.server.maxOpen")
	con.MaxLifetime = viper.GetInt("database.server.maxLifetime")
}