package install

import (
	"bytes"
	"encoding/json"
	"fmt"
	"net/http"
	"net/http/httptest"
	"os"

	"github.com/gin-gonic/gin"
	"github.com/tidwall/gjson"
)

type Env struct {
	AutoInstall string `json:"auto_install"`
	DbType      string `json:"db_type"`
	DbUsername  string `json:"db_username"`
	DbPassword  string `json:"db_password"`
	DbHost      string `json:"db_host"`
	DbName      string `json:"db_name"`
	DbFile      string `json:"db_file"`
	Language    string `json:"lang"`

	SiteName      string `json:"site_name"`
	SiteURL       string `json:"site_url"`
	ContactEmail  string `json:"contact_email"`
	AdminName     string `json:"name"`
	AdminPassword string `json:"password"`
	AdminEmail    string `json:"email"`
}

func TryToInstallByEnv() (installByEnv bool, err error) {
	env := loadEnv()
	if len(env.AutoInstall) == 0 {
		return false, nil
	}
	fmt.Println("[auto-install] try to install by environment variable")
	return true, initByEnv(env)
}

func loadEnv() (env *Env) {
	return &Env{
		AutoInstall:   os.Getenv("AUTO_INSTALL"),
		DbType:        os.Getenv("DB_TYPE"),
		DbUsername:    os.Getenv("DB_USERNAME"),
		DbPassword:    os.Getenv("DB_PASSWORD"),
		DbHost:        os.Getenv("DB_HOST"),
		DbName:        os.Getenv("DB_NAME"),
		DbFile:        os.Getenv("DB_FILE"),
		Language:      os.Getenv("LANGUAGE"),
		SiteName:      os.Getenv("SITE_NAME"),
		SiteURL:       os.Getenv("SITE_URL"),
		ContactEmail:  os.Getenv("CONTACT_EMAIL"),
		AdminName:     os.Getenv("ADMIN_NAME"),
		AdminPassword: os.Getenv("ADMIN_PASSWORD"),
		AdminEmail:    os.Getenv("ADMIN_EMAIL"),
	}
}

func initByEnv(env *Env) (err error) {
	gin.SetMode(gin.TestMode)
	if err = dbCheck(env); err != nil {
		return err
	}
	if err = initConfigAndDb(env); err != nil {
		return err
	}
	if err = initBaseInfo(env); err != nil {
		return err
	}
	return nil
}

func dbCheck(env *Env) (err error) {
	req := &CheckDatabaseReq{
		DbType:     env.DbType,
		DbUsername: env.DbUsername,
		DbPassword: env.DbPassword,
		DbHost:     env.DbHost,
		DbName:     env.DbName,
		DbFile:     env.DbFile,
	}
	return requestAPI(req, "POST", "/installation/db/check", CheckDatabase)
}

func initConfigAndDb(env *Env) (err error) {
	req := &CheckDatabaseReq{
		DbType:     env.DbType,
		DbUsername: env.DbUsername,
		DbPassword: env.DbPassword,
		DbHost:     env.DbHost,
		DbName:     env.DbName,
		DbFile:     env.DbFile,
	}
	return requestAPI(req, "POST", "/installation/init", InitEnvironment)
}

func initBaseInfo(env *Env) (err error) {
	req := &InitBaseInfoReq{
		Language:      env.Language,
		SiteName:      env.SiteName,
		SiteURL:       env.SiteURL,
		ContactEmail:  env.ContactEmail,
		AdminName:     env.AdminName,
		AdminPassword: env.AdminPassword,
		AdminEmail:    env.AdminEmail,
	}
	return requestAPI(req, "POST", "/installation/base-info", InitBaseInfo)
}

func requestAPI(req interface{}, method, url string, handlerFunc gin.HandlerFunc) error {
	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	body, _ := json.Marshal(req)
	c.Request, _ = http.NewRequest(method, url, bytes.NewBuffer(body))
	if method == "POST" {
		c.Request.Header.Set("Content-Type", "application/json")
	}
	handlerFunc(c)
	if w.Code != http.StatusOK {
		return fmt.Errorf(gjson.Get(w.Body.String(), "msg").String())
	}
	return nil
}