package controllers

import (
	"fmt"
	"html"
	"log"
	"net/http"
	"smt/models"
	"smt/utils"
	"strings"

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

type PermissionInput struct {
	PermissionId int    `db:"PermissionId" json:"permissionId"`
	Description  string `db:"Description" json:"description"`
	ReadOnly     bool   `db:"ReadOnly" json:"readOnly"`
	SafeId       int    `db:"SafeId" json:"safeId"`
	UserId       int    `db:"UserId" json:"userId"`
	GroupId      int    `db:"GroupId" json:"groupId"`
}

func GetPermissionsHandler(c *gin.Context) {
	permissions, err := models.PermissionList()

	if err != nil {
		errString := fmt.Sprintf("error retrieving permissions : '%s'", err)
		log.Printf("GetPermissionsHandler %s\n", errString)
		c.JSON(http.StatusBadRequest, gin.H{"error": errString})
		return
	}

	c.JSON(http.StatusOK, gin.H{"message": "success", "data": permissions})
}

func AddPermissionHandler(c *gin.Context) {
	var input PermissionInput
	var RequestingUserId int

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

	// Validate input
	if len(input.Description) == 0 && input.PermissionId == 0 {
		c.JSON(http.StatusBadRequest, gin.H{"error": "no permission id or description specified"})
		return
	}
	if input.SafeId == 0 {
		c.JSON(http.StatusBadRequest, gin.H{"error": "no safe id specified"})
		return
	}
	if input.UserId == 0 && input.GroupId == 0 {
		c.JSON(http.StatusBadRequest, gin.H{"error": "no user id or group id specified"})
		return
	}

	if val, ok := c.Get("user-id"); !ok {
		c.JSON(http.StatusBadRequest, gin.H{"error": "error determining user"})
		return
	} else {
		RequestingUserId = val.(int)
	}

	p := models.Permission{
		PermissionId: input.PermissionId,
		Description:  input.Description,
		ReadOnly:     input.ReadOnly,
		SafeId:       input.SafeId,
		UserId:       input.UserId,
		GroupId:      input.GroupId,
	}

	//remove leading/trailing spaces in permission description
	p.Description = html.EscapeString(strings.TrimSpace(p.Description))

	// Check if permission definition already exists
	testPermission, _ := models.PermissionGetByDesc(p.Description)
	log.Printf("AddPermissionHandler checking if permissions with description '%s' already exists\n", p.Description)

	if (models.Permission{} == testPermission) {
		log.Printf("AddPermissionHandler confirmed no permission with same description\n")
	} else {
		errorString := fmt.Sprintf("attempt to register permissions with description '%s' but id '%d' already exists", p.Description, testPermission.PermissionId)
		log.Printf("Register error : '%s'\n", errorString)
		c.JSON(http.StatusBadRequest, gin.H{"error": errorString})
		return
	}

	_, err := p.PermissionAdd()

	// Create audit record
	a := models.Audit{
		UserId:    RequestingUserId,
		IpAddress: c.ClientIP(),
		EventText: fmt.Sprintf("Created Permission '%s' with id %d on safe id %d for group id %d or user id %d", p.Description, p.PermissionId, p.SafeId, p.GroupId, p.UserId),
	}
	a.AuditLogAdd()

	if err != nil {
		errString := fmt.Sprintf("error creating permission : '%s'", err)
		log.Printf("AddPermissionHandler %s\n", errString)
		c.JSON(http.StatusBadRequest, gin.H{"error": errString})
		return
	}

	c.JSON(http.StatusOK, gin.H{"message": "permission creation success", "data": p})
}

func DeletePermissionHandler(c *gin.Context) {
	var input PermissionInput
	var RequestingUserId int

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

	// Input validation
	if input.PermissionId == 0 && len(input.Description) == 0 {
		errString := "no permission description or id specified"
		log.Printf("DeletePermissionHandler %s\n", errString)
		c.JSON(http.StatusBadRequest, gin.H{"error": errString})
		return
	}

	if val, ok := c.Get("user-id"); !ok {
		c.JSON(http.StatusBadRequest, gin.H{"error": "error determining user"})
		return
	} else {
		RequestingUserId = val.(int)
	}

	p := models.Permission{
		PermissionId: input.PermissionId,
		Description:  input.Description,
		ReadOnly:     input.ReadOnly,
		SafeId:       input.SafeId,
		UserId:       input.UserId,
		GroupId:      input.GroupId,
	}

	//remove leading/trailing spaces in permission description
	p.Description = html.EscapeString(strings.TrimSpace(p.Description))

	// Check if permission definition already exists
	if len(p.Description) > 0 {
		log.Printf("DeletePermissionHandler confirming permission with description '%s' exists\n", p.Description)
		testPermission, _ := models.PermissionGetByDesc(p.Description)

		if (models.Permission{} == testPermission) {
			errString := fmt.Sprintf("attempt to delete non-existing permission with description '%s'", p.Description)
			log.Printf("DeletePermissionHandler %s\n", errString)
			c.JSON(http.StatusBadRequest, gin.H{"error": errString})
			return
		}
	} else {
		log.Printf("DeletePermissionHandler confirming permission with id '%d' exists\n", p.PermissionId)
		testPermission, _ := models.PermissionGetById(p.PermissionId)

		if (models.Permission{} == testPermission) {
			errString := fmt.Sprintf("attempt to delete non-existing permission with id '%d'", p.PermissionId)
			log.Printf("DeletePermissionHandler %s\n", errString)
			c.JSON(http.StatusBadRequest, gin.H{"error": errString})
			return
		}
	}

	err := p.PermissionDelete()

	// Create audit record
	a := models.Audit{
		UserId:    RequestingUserId,
		IpAddress: c.ClientIP(),
		EventText: fmt.Sprintf("Deleted Permission '%s' with id %d", p.Description, p.PermissionId),
	}
	a.AuditLogAdd()

	if err != nil {
		errString := fmt.Sprintf("error deleting permission : '%s'", err)
		log.Printf("DeletePermissionHandler %s\n", errString)
		c.JSON(http.StatusBadRequest, gin.H{"error": errString})
		return
	}

	c.JSON(http.StatusOK, gin.H{"message": "permission deletion success"})

}

func UpdatePermissionHandler(c *gin.Context) {
	var input PermissionInput
	var RequestingUserId int

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

	// Input validation
	if input.PermissionId == 0 {
		errString := "must specify permission id"
		log.Printf("UpdatePermissionHandler %s\n", errString)
		c.JSON(http.StatusBadRequest, gin.H{"error": errString})
		return
	}

	if val, ok := c.Get("user-id"); !ok {
		c.JSON(http.StatusBadRequest, gin.H{"error": "error determining user"})
		return
	} else {
		RequestingUserId = val.(int)
	}

	// Check specified permission currently exists
	currentPermission, err := models.PermissionGetById(input.PermissionId)

	if err != nil {
		errString := fmt.Sprintf("error querying existing permission : '%s'", err)
		log.Printf("UpdatePermissionHandler %s\n", errString)
		c.JSON(http.StatusBadRequest, gin.H{"error": errString})
		return
	}
	if (models.Permission{} == currentPermission) {
		errString := fmt.Sprintf("no permission id '%d' found", input.PermissionId)
		log.Printf("UpdatePermissionHandler %s\n", errString)
		c.JSON(http.StatusBadRequest, gin.H{"error": errString})
		return
	}

	// create new struct with values supplied by user
	newPermission := models.Permission{
		PermissionId: input.PermissionId,
		Description:  input.Description,
		ReadOnly:     input.ReadOnly,
		SafeId:       input.SafeId,
		UserId:       input.UserId,
		GroupId:      input.GroupId,
	}

	//remove leading/trailing spaces in permission description
	newPermission.Description = html.EscapeString(strings.TrimSpace(newPermission.Description))

	// Copy newPermission into currentPermission
	utils.UpdateStruct(&currentPermission, &newPermission)

	// run the database update
	_, err = currentPermission.PermissionUpdate()

	if err != nil {
		errString := fmt.Sprintf("error updating permission : '%s'", err)
		log.Printf("UpdatePermissionHandler %s\n", errString)
		c.JSON(http.StatusBadRequest, gin.H{"error": errString})
		return
	}

	//create audit record
	a := models.Audit{
		UserId:    RequestingUserId,
		IpAddress: c.ClientIP(),
		EventText: fmt.Sprintf("Updated Permission '%s' with id %d", currentPermission.Description, currentPermission.PermissionId),
	}
	a.AuditLogAdd()

	c.JSON(http.StatusOK, gin.H{"message": "permission update success"})
}