package v1

import (
	"net/http"
	"strings"
	"time"

	"git.jamestombleson.com/jtom38/newsbot-api/internal/domain"
	"git.jamestombleson.com/jtom38/newsbot-api/internal/repository"

	"github.com/labstack/echo/v4"
)

const (
	ErrUserNotFound          = "requested user does not exist"
	ErrUsernameAlreadyExists = "the requested username already exists"
)

// @Summary  Creates a new user
// @Router   /v1/users/register [post]
// @Param    request  formData  domain.LoginFormRequest  true  "form"
// @Accepts  x-www-form-urlencoded
// @Produce   json
// @Tags      Users
// @Success   200  {object}  domain.BaseResponse
// @Failure   400  {object}  domain.BaseResponse
// @Failure   500  {object}  domain.BaseResponse
func (h *Handler) AuthRegister(c echo.Context) error {
	username := c.FormValue("username")
	password := c.FormValue("password")

	//username := c.QueryParam("username")
	exists, err := h.repo.Users.GetUser(c.Request().Context(), 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() != repository.ErrUserNotFound {
			return h.WriteError(c, err, http.StatusBadRequest)
		}
	}
	if exists.Username == username {
		return h.InternalServerErrorResponse(c, ErrUsernameAlreadyExists)
	}

	//password := c.QueryParam("password")
	err = h.repo.Users.CheckPasswordForRequirements(password)
	if err != nil {
		return h.WriteError(c, err, http.StatusInternalServerError)
	}

	_, err = h.repo.Users.Create(c.Request().Context(), username, password, domain.ScopeArticleRead)
	if err != nil {
		return h.InternalServerErrorResponse(c, err.Error())
	}

	return c.JSON(http.StatusCreated, domain.BaseResponse{
		Message: "OK",
	})
}

// @Summary  Logs into the API and returns a bearer token if successful
// @Router   /v1/users/login [post]
// @Param    request  formData  domain.LoginFormRequest  true  "form"
// @Accepts  x-www-form-urlencoded
// @Produce   json
// @Tags      Users
// @Success   200  {object}  domain.LoginResponse
// @Failure   400  {object}  domain.BaseResponse
// @Failure   500  {object}  domain.BaseResponse
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.createAdminToken(c, password)
	}

	// check if the user exists
	user, err := h.repo.Users.GetUser(c.Request().Context(), username)
	if err != nil {
		return h.InternalServerErrorResponse(c, err.Error())
	}

	// make sure the hash matches
	err = h.repo.Users.DoesPasswordMatchHash(c.Request().Context(), 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)
	userScopes := strings.Split(user.Scopes, ",")

	jwt, err := h.generateJwtWithExp(username, h.config.ServerAddress, userScopes, user.ID, expiresAt)
	if err != nil {
		return h.InternalServerErrorResponse(c, err.Error())
	}

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

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

func (h *Handler) createAdminToken(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.AdminSecret == "" {
		return h.InternalServerErrorResponse(c, ErrUserNotFound)
	}

	if h.config.AdminSecret != password {
		return h.UnauthorizedResponse(c, ErrUserNotFound)
	}
	var userScopes []string
	userScopes = append(userScopes, domain.ScopeAll)

	token, err := h.generateJwt("admin", h.config.ServerAddress, userScopes, -1)
	if err != nil {
		return h.InternalServerErrorResponse(c, err.Error())
	}

	return c.JSON(http.StatusOK, domain.LoginResponse{
		BaseResponse: domain.BaseResponse{
			Message: "OK",
		},
		Token: token,
		Type:  "Bearer",
	})
}

// This will take collect some information about the requested refresh, validate and then return a new jwt token if approved.
// Register
// @Summary   Generates a new token
// @Router    /v1/users/refreshToken [post]
// @Param     request  body  domain.RefreshTokenRequest  true  "body"
// @Tags      Users
// @Success  200  {object}  domain.LoginResponse
// @Failure   400  {object}  domain.BaseResponse
// @Failure   500  {object}  domain.BaseResponse
// @Security  Bearer
func (h *Handler) RefreshJwtToken(c echo.Context) error {
	_, err := h.ValidateJwtToken(c, domain.ScopeDiscordWebHookCreate)
	if err != nil {
		return h.WriteError(c, err, http.StatusBadRequest)
	}

	// 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.repo.RefreshTokens.IsRequestValid(c.Request().Context(), request.Username, request.RefreshToken)
	if err != nil {
		return h.InternalServerErrorResponse(c, err.Error())
	}

	user, err := h.repo.Users.GetUser(c.Request().Context(), request.Username)
	if err != nil {
		return h.InternalServerErrorResponse(c, err.Error())
	}
	userScopes := strings.Split(user.Scopes, ",")

	jwt, err := h.generateJwtWithExp(request.Username, h.config.ServerAddress, userScopes, user.ID, time.Now().Add(time.Hour*48))
	if err != nil {
		return h.InternalServerErrorResponse(c, err.Error())
	}

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

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

// @Summary   Adds a new scope to a user account
// @Router    /v1/users/scopes/add [post]
// @Param     request  body  domain.UpdateScopesRequest  true  "body"
// @Tags     Users
// @Accept    json
// @Produce  json
// @Success   200  {object}  domain.BaseResponse
// @Failure  400  {object}  domain.BaseResponse
// @Failure  500  {object}  domain.BaseResponse
// @Security  Bearer
func (h *Handler) AddScopes(c echo.Context) error {
	_, err := h.ValidateJwtToken(c, domain.ScopeAll)
	if err != nil {
		return h.WriteError(c, err, http.StatusBadRequest)
	}

	request := domain.UpdateScopesRequest{}
	err = (&echo.DefaultBinder{}).BindBody(c, &request)
	if err != nil {
		return h.WriteError(c, err, http.StatusBadRequest)
	}

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

	return c.JSON(http.StatusOK, domain.BaseResponse{
		Message: "OK",
	})
}

// @Summary   Adds a new scope to a user account
// @Router    /v1/users/scopes/remove [post]
// @Param     request  body  domain.UpdateScopesRequest  true  "body"
// @Tags     Users
// @Accept    json
// @Produce  json
// @Success  200  {object}  domain.BaseResponse
// @Failure  400  {object}  domain.BaseResponse
// @Failure  500  {object}  domain.BaseResponse
// @Security  Bearer
func (h *Handler) RemoveScopes(c echo.Context) error {
	token, err := h.getJwtTokenFromContext(c)
	if err != nil {
		return h.WriteError(c, err, http.StatusUnauthorized)
	}

	err = token.IsValid(domain.ScopeAll)
	if err != nil {
		return h.WriteError(c, err, http.StatusUnauthorized)
	}

	request := domain.UpdateScopesRequest{}
	err = (&echo.DefaultBinder{}).BindBody(c, &request)
	if err != nil {
		h.WriteError(c, err, http.StatusBadRequest)

	}

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

	return c.JSON(http.StatusOK, domain.BaseResponse{
		Message: "OK",
	})
}