package app

import (
	"database/sql"
	"io/ioutil"

	"github.com/gin-gonic/gin"
	"github.com/osuripple/api/common"
)

// Method wraps an API method to a HandlerFunc.
func Method(f func(md common.MethodData) common.Response, db *sql.DB, privilegesNeeded ...int) gin.HandlerFunc {
	return func(c *gin.Context) {
		initialCaretaker(c, f, db, privilegesNeeded...)
	}
}

func initialCaretaker(c *gin.Context, f func(md common.MethodData) common.Response, db *sql.DB, privilegesNeeded ...int) {
	data, err := ioutil.ReadAll(c.Request.Body)
	if err != nil {
		c.Error(err)
	}
	c.Request.Body.Close()

	token := ""
	switch {
	case c.Request.Header.Get("X-Ripple-Token") != "":
		token = c.Request.Header.Get("X-Ripple-Token")
	case c.Query("token") != "":
		token = c.Query("token")
	case c.Query("k") != "":
		token = c.Query("k")
	}

	md := common.MethodData{
		DB:          db,
		RequestData: data,
		C:           c,
	}
	if token != "" {
		tokenReal, exists := GetTokenFull(token, db)
		if exists {
			md.User = tokenReal
		}
	}

	missingPrivileges := 0
	for _, privilege := range privilegesNeeded {
		if int(md.User.Privileges)&privilege == 0 {
			missingPrivileges |= privilege
		}
	}
	if missingPrivileges != 0 {
		c.IndentedJSON(401, common.Response{
			Code:    401,
			Message: "You don't have the privilege(s): " + common.Privileges(missingPrivileges).String() + ".",
		})
		return
	}

	resp := f(md)
	if resp.Code == 0 {
		resp.Code = 500
	}
	if _, exists := c.GetQuery("pls200"); exists {
		c.IndentedJSON(200, resp)
	} else {
		c.IndentedJSON(resp.Code, resp)
	}
}