package http

import (
	"context"
	"fmt"
	"net/http"
	"time"

	"git.javil.eu/jacob1123/budgeteer"
	"git.javil.eu/jacob1123/budgeteer/postgres"
	"github.com/gin-gonic/gin"
)

func (h *Handler) verifyLogin(c *gin.Context) (budgeteer.Token, error) {
	tokenString, err := c.Cookie(authCookie)
	if err != nil {
		return nil, fmt.Errorf("get cookie: %w", err)
	}

	token, err := h.TokenVerifier.VerifyToken(tokenString)
	if err != nil {
		c.SetCookie(authCookie, "", -1, "", "", false, false)
		return nil, fmt.Errorf("verify token '%s': %w", tokenString, err)
	}

	return token, nil
}

func (h *Handler) verifyLoginWithRedirect(c *gin.Context) {
	token, err := h.verifyLogin(c)
	if err != nil {
		c.Redirect(http.StatusTemporaryRedirect, "/login")
		c.Abort()
		return
	}

	c.Set("token", token)
	c.Next()
}

func (h *Handler) login(c *gin.Context) {
	if _, err := h.verifyLogin(c); err == nil {
		c.Redirect(http.StatusTemporaryRedirect, "/dashboard")
		return
	}

	c.HTML(http.StatusOK, "login.html", nil)
}

func (h *Handler) register(c *gin.Context) {
	if _, err := h.verifyLogin(c); err == nil {
		c.Redirect(http.StatusTemporaryRedirect, "/dashboard")
		return
	}

	c.HTML(http.StatusOK, "register.html", nil)
}

func logout(c *gin.Context) {
	clearLogin(c)
}

func clearLogin(c *gin.Context) {
	c.SetCookie(authCookie, "", -1, "", "", false, true)
}

func (h *Handler) loginPost(c *gin.Context) {
	username, _ := c.GetPostForm("username")
	password, _ := c.GetPostForm("password")

	user, err := h.Service.DB.GetUserByUsername(context.Background(), username)
	if err != nil {
		c.AbortWithError(http.StatusUnauthorized, err)
		return
	}

	if err = h.CredentialsVerifier.Verify(password, user.Password); err != nil {
		c.AbortWithError(http.StatusUnauthorized, err)
		return
	}

	t, err := h.TokenVerifier.CreateToken(&user)
	if err != nil {
		c.AbortWithError(http.StatusUnauthorized, err)
	}

	_, _ = h.Service.DB.UpdateLastLogin(context.Background(), user.ID)
	maxAge := (int)((expiration * time.Hour).Seconds())
	c.SetCookie(authCookie, t, maxAge, "", "", false, true)
	c.JSON(http.StatusOK, map[string]string{
		"token": t,
	})
}

func (h *Handler) registerPost(c *gin.Context) {
	email, _ := c.GetPostForm("email")
	password, _ := c.GetPostForm("password")
	name, _ := c.GetPostForm("name")

	_, err := h.Service.DB.GetUserByUsername(context.Background(), email)
	if err == nil {
		c.AbortWithStatus(http.StatusUnauthorized)
		return
	}

	hash, err := h.CredentialsVerifier.Hash(password)
	if err != nil {
		c.AbortWithError(http.StatusUnauthorized, err)
		return
	}

	createUser := postgres.CreateUserParams{
		Name:     name,
		Password: hash,
		Email:    email,
	}
	_, err = h.Service.DB.CreateUser(context.Background(), createUser)
	if err != nil {
		c.AbortWithError(http.StatusInternalServerError, err)
	}
}