package v1

import (
	"errors"
	"net/http"
	"time"

	"git.jamestombleson.com/jtom38/go-cook/internal/domain"
	"git.jamestombleson.com/jtom38/go-cook/internal/repositories"

	"github.com/golang-jwt/jwt/v5"
	"github.com/labstack/echo/v4"
)

const (
	ErrJwtMissing            = "auth token is missing"
	ErrJwtClaimsMissing      = "claims missing on token"
	ErrJwtExpired            = "auth token has expired"
	ErrJwtScopeMissing       = "required scope is missing"
	ErrUserNotFound          = "requested user does not exist"
	ErrUsernameAlreadyExists = "the requested username already exists"
)

func (h *Handler) AuthRegister(c echo.Context) error {
	username := c.FormValue("username")
	password := c.FormValue("password")

	//username := c.QueryParam("username")
	exists, err := h.users.GetUser(username)
	if err != nil {
		// if we have an err, validate that if its not user not found.
		// if the user is not found, we can use that name
		if err.Error() != repositories.ErrUserNotFound {
			return c.JSON(http.StatusInternalServerError, domain.ErrorResponse{
				Message: err.Error(),
				Success: true,
			})
		}
	}
	if exists.Name == username {
		return h.InternalServerErrorResponse(c, ErrUsernameAlreadyExists)
	}

	//password := c.QueryParam("password")
	err = h.users.CheckPasswordForRequirements(password)
	if err != nil {
		return c.JSON(http.StatusInternalServerError, domain.ErrorResponse{
			Success: false,
			Message: err.Error(),
		})
	}

	_, err = h.users.Create(username, password, domain.ScopeRecipeRead)
	if err != nil {
		return c.JSON(http.StatusInternalServerError, domain.ErrorResponse{
			Success: false,
			Message: err.Error(),
		})
	}

	return c.JSON(http.StatusCreated, domain.ErrorResponse{
		Success: true,
	})
}

func (h *Handler) AuthLogin(c echo.Context) error {
	username := c.FormValue("username")
	password := c.FormValue("password")

	// Check to see if they are trying to login with the admin token
	if username == "" {
		return h.validateAdminToken(c, password)
	}

	// check if the user exists
	err := h.users.DoesUserExist(username)
	if err != nil {
		return h.InternalServerErrorResponse(c, err.Error())
	}

	// make sure the hash matches
	err = h.users.DoesPasswordMatchHash(username, password)
	if err != nil {
		return h.InternalServerErrorResponse(c, err.Error())
	}

	// TODO think about moving this down some?
	expiresAt := time.Now().Add(time.Hour * 48)

	jwt, err := h.generateJwtWithExp(username, h.Config.ApiUri, expiresAt)
	if err != nil {
		return h.InternalServerErrorResponse(c, err.Error())
	}

	refresh, err := h.refreshTokens.Create(username)
	if err != nil {
		return h.InternalServerErrorResponse(c, err.Error())
	}

	return c.JSON(http.StatusOK, domain.LoginResponse{
		BaseResponse: domain.BaseResponse{
			Success: true,
			Message: "OK",
		},
		Token:        jwt,
		Type:         "Bearer",
		RefreshToken: refresh,
	})
}

func (h *Handler) validateAdminToken(c echo.Context, password string) error {
	// if the admin token is blank, then the admin wanted this disabled.
	// this will fail right away and not progress.
	if h.Config.AdminToken == "" {
		return h.InternalServerErrorResponse(c, ErrUserNotFound)
	}

	if h.Config.AdminToken != password {
		return h.ReturnUnauthorizedResponse(c, ErrUserNotFound)
	}

	token, err := h.generateJwt("admin", h.Config.ApiUri)
	if err != nil {
		return h.InternalServerErrorResponse(c, err.Error())
	}

	return c.JSON(http.StatusOK, token)
}

// This will take collect some information about the requested refresh, validate and then return a new jwt token if approved.
func (h *Handler) RefreshJwtToken(c echo.Context) error {
	// Check the context for the refresh token
	var request domain.RefreshTokenRequest
	err := (&echo.DefaultBinder{}).BindBody(c, &request)
	if err != nil {
		return h.InternalServerErrorResponse(c, err.Error())
	}

	err = h.refreshTokens.IsRequestValid(request.Username, request.RefreshToken)
	if err != nil {
		return h.InternalServerErrorResponse(c, err.Error())
	}

	jwt, err := h.generateJwtWithExp(request.Username, h.Config.ApiUri, time.Now().Add(time.Hour * 48))
	if err!= nil {
		return h.InternalServerErrorResponse(c, err.Error())
	}

	newRefreshToken, err := h.refreshTokens.Create(request.Username)
	if err != nil {
		return h.InternalServerErrorResponse(c, err.Error())
	}

	return c.JSON(http.StatusOK, domain.LoginResponse{
		BaseResponse: domain.BaseResponse{
			Success: true,
			Message: "OK",
		},
		Token:        jwt,
		Type:         "Bearer",
		RefreshToken: newRefreshToken,
	})
}

func (h *Handler) AddScopes(c echo.Context) error {
	token, err := h.getJwtToken(c)
	if err != nil {
		return h.ReturnUnauthorizedResponse(c, err.Error())
	}

	err = token.IsValid(domain.ScopeAll)
	if err != nil {
		return h.ReturnUnauthorizedResponse(c, err.Error())
	}

	request := domain.UpdateScopesRequest{}
	err = (&echo.DefaultBinder{}).BindBody(c, &request)
	if err != nil {
		return c.JSON(http.StatusBadRequest, domain.ErrorResponse{
			Success: false,
			Message: err.Error(),
		})
	}

	err = h.users.AddScopes(request.Username, request.Scopes)
	if err != nil {
		return h.InternalServerErrorResponse(c, err.Error())
	}

	return c.JSON(http.StatusOK, domain.ErrorResponse{
		Success: true,
	})
}

func (h *Handler) RemoveScopes(c echo.Context) error {
	token, err := h.getJwtToken(c)
	if err != nil {
		return h.ReturnUnauthorizedResponse(c, err.Error())
	}

	err = token.IsValid(domain.ScopeAll)
	if err != nil {
		return h.ReturnUnauthorizedResponse(c, err.Error())
	}

	request := domain.UpdateScopesRequest{}
	err = (&echo.DefaultBinder{}).BindBody(c, &request)
	if err != nil {
		return c.JSON(http.StatusBadRequest, domain.ErrorResponse{
			Success: false,
			Message: err.Error(),
		})
	}

	err = h.users.RemoveScopes(request.Username, request.Scopes)
	if err != nil {
		return h.InternalServerErrorResponse(c, err.Error())
	}

	return c.JSON(http.StatusOK, domain.ErrorResponse{
		Success: true,
	})
}

func (h *Handler) getJwtToken(c echo.Context) (JwtToken, error) {
	// Make sure that the request came with a jwtToken
	token, ok := c.Get("user").(*jwt.Token)
	if !ok {
		return JwtToken{}, errors.New(ErrJwtMissing)
	}

	// Generate the claims from the token
	claims, ok := token.Claims.(*JwtToken)
	if !ok {
		return JwtToken{}, errors.New(ErrJwtClaimsMissing)
	}

	return *claims, nil
}