package controllers

import (
	"errors"
	"log"
	"net/http"
	"smt/models"
	"smt/utils/token"

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

// bindings are validated by https://github.com/go-playground/validator
type StoreInput struct {
	//RoleId         int    `json:"roleId"`
	SafeId         int    `json:"safeId"`
	SafeName       string `json:"safeName"`
	DeviceName     string `json:"deviceName"`
	DeviceCategory string `json:"deviceCategory"`
	UserName       string `json:"userName" binding:"required"`
	SecretValue    string `json:"secretValue" binding:"required"`
}

func StoreSecret(c *gin.Context) {
	var err error
	var input StoreInput

	if err := c.ShouldBindJSON(&input); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid JSON received : " + err.Error()})
		return
	}

	if input.SafeId == 0 && len(input.SafeName) == 0 {
		errString := "StoreSecret no safe specified\n"
		log.Print(errString)
		c.JSON(http.StatusBadRequest, gin.H{"error": errString})
		return
	}

	// Don't log this since it contains plaintext secrets
	//log.Printf("StoreSecret received JSON input '%v'\n", input)

	// Populate fields
	s := models.Secret{}
	s.UserName = input.UserName
	s.DeviceName = input.DeviceName
	s.DeviceCategory = input.DeviceCategory

	// Query which safes the current user is allowed to access
	user_id, err := token.ExtractTokenID(c)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "error determining user"})
		return
	}

	safeId := SecretCheckSafeAllowed(int(user_id), input)
	if safeId == 0 {
		c.JSON(http.StatusBadRequest, gin.H{"error": "error determining safe"})
		return
	}

	s.SafeId = safeId

	/*
		// If RoleID is not defined then default to the same role as the user requesting secret to be stored
		if input.RoleId != 0 {
			s.RoleId = input.RoleId
		} else {
			ur, _ := models.GetUserRoleFromToken(c)
			log.Printf("StoreSecret RoleId was not specified, setting to RoleId of '%d'\n", ur.RoleId)
			s.RoleId = ur.RoleId
		}
	*/

	if input.DeviceCategory == "" && input.DeviceName == "" {
		c.JSON(http.StatusBadRequest, gin.H{"error": "cannot store secret with empty deviceName and empty deviceCategory"})
		return
	}

	// TODO - replace this with a call to SecretsGetMultipleSafes

	// If this secret already exists in the database then generate an error
	checkExists, err := models.GetSecrets(&s, false)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	if len(checkExists) > 0 {
		log.Printf("StoreSecret not storing secret with '%d' already matching secrets.\n", len(checkExists))
		c.JSON(http.StatusBadRequest, gin.H{"error": "StoreSecret attempting to store secret already defined. Use update API call instead"})
		return
	}

	// Encrypt secret
	s.Secret = input.SecretValue
	_, err = s.EncryptSecret()
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "StoreSecret error encrypting secret : " + err.Error()})
		return
	}

	_, err = s.SaveSecret()
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "StoreSecret error saving secret : " + err.Error()})
		return
	}

	c.JSON(http.StatusOK, gin.H{"message": "secret stored successfully"})
}

func UpdateSecret(c *gin.Context) {
	var err error
	var input StoreInput

	if err := c.ShouldBindJSON(&input); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "UpdateSecret error binding to input JSON : " + err.Error()})
		return
	}

	log.Printf("UpdateSecret received JSON input '%v'\n", input)

	/*
		// Get the user and role id of the requestor
		u, err := models.UserGetRoleFromToken(c)
		if err != nil {
			c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
			return
		}
		// Verify that the user role is not readonly
		if u.ReadOnly {
			c.JSON(http.StatusForbidden, gin.H{"error": "UpdateSecret user role does not permit updates"})
			return
		}
	*/

	// Populate fields
	s := models.Secret{}

	s.UserName = input.UserName
	s.DeviceName = input.DeviceName
	s.DeviceCategory = input.DeviceCategory

	/*
		// Default role ID is 1 if not defined
		if input.RoleId != 0 {
			s.RoleId = input.RoleId
		} else {
			s.RoleId = 1
		}
	*/

	// Query which safes the current user is allowed to access
	user_id, err := token.ExtractTokenID(c)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "error determining user"})
		return
	}

	safeId := SecretCheckSafeAllowed(int(user_id), input)
	if safeId == 0 {
		c.JSON(http.StatusBadRequest, gin.H{"error": "error determining safe"})
		return
	}

	s.SafeId = safeId

	// TODO - replace this with a call to SecretsGetMultipleSafes

	// Confirm that the secret already exists
	checkExists, err := models.GetSecrets(&s, false)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	if len(checkExists) == 0 {
		err = errors.New("UpdateSecret could not find existing secret to update")
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	} else if len(checkExists) == 1 {
		// Set the secret id with the one retrieved from the database
		s.SecretId = checkExists[0].SecretId

		// check for empty fields in the update request and update from the existing record
		if s.UserName == "" {
			s.UserName = checkExists[0].UserName
		}
		if s.DeviceCategory == "" {
			s.DeviceCategory = checkExists[0].DeviceCategory
		}
		if s.DeviceName == "" {
			s.DeviceName = checkExists[0].DeviceName
		}

		// Encrypt secret
		s.Secret = input.SecretValue
		_, err = s.EncryptSecret()
		if err != nil {
			c.JSON(http.StatusBadRequest, gin.H{"error": "UpdateSecret error encrypting secret : " + err.Error()})
			return
		}

		_, err = s.UpdateSecret()
		if err != nil {
			c.JSON(http.StatusBadRequest, gin.H{"error": "UpdateSecret error saving secret : " + err.Error()})
			return
		}

		c.JSON(http.StatusOK, gin.H{"message": "secret updated successfully"})
	} else {
		err = errors.New("UpdateSecret found multiple secrets matching input data, be more specific")
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

}

func SecretCheckSafeAllowed(user_id int, input StoreInput) int {
	// Query which safes the current user is allowed to access

	// SafeId is by default the same as the safe that the user belongs to
	safeList, err := models.UserGetSafesAllowed(user_id)
	if err != nil {
		log.Printf("SecretCheckSafeAllowed error determining allowed safes for userId %d : '%s'\n", user_id, err)
		return 0
	}

	// Verify user has access to specified safe
	for _, safe := range safeList {
		if len(input.SafeName) > 0 && safe.SafeName == input.SafeName { // Safe specifed by name
			return safe.SafeId
		} else if input.SafeId > 0 && safe.SafeId == input.SafeId { // Safe specified by id
			return safe.SafeId
		}
	}

	// TODO what about Admin role

	return 0

	/*
		if !matchFound {
			errString := "no safe specified or no access to specified safe"
			log.Println(errString)
			c.JSON(http.StatusBadRequest, gin.H{"error": errString})
			return
		}
	*/
}