package server

import (
	"errors"
	"fmt"
	"log"
	"net/http"

	"github.com/gin-gonic/gin"
	"github.com/golang-jwt/jwt/v5"
	domain "github.com/haydenhargreaves/Potion/internal/domain/server"
)

// DepedencyInjectionMiddleware injects the dependencies into the context set. This is a middleware
// that is used to apply the required services.
func DepedencyInjectionMiddleware(deps *domain.InjectedDependencies) gin.HandlerFunc {
	return func(ctx *gin.Context) {
		ctx.Set("deps", deps)
		ctx.Next()
	}
}

func JwtAuthMiddleWare(jwtSecretKey []byte) gin.HandlerFunc {
	return func(ctx *gin.Context) {
		// NOTE: Option One: From auth header
		//
		// authHeader := ctx.GetHeader("Authorization")
		//
		// if authHeader == "" {
		// 	ctx.JSON(http.StatusUnauthorized, gin.H{"error": "Authorization required."})
		// 	ctx.Abort()
		// 	return
		// }
		//
		// parts := strings.SplitN(authHeader, " ", 2)
		// if !(len(parts) == 2 && parts[0] == "Bearer") {
		// 	ctx.JSON(http.StatusUnauthorized, gin.H{"error": "Authorization header must be Bearer token"})
		// 	ctx.Abort()
		// 	return
		// }
		//
		// tokenString := parts[1]

		// TODO: How are we handling faliure?

		tokenString, err := ctx.Cookie("jwt_token")
		if err != nil {
			ctx.JSON(http.StatusUnauthorized, gin.H{"error": "JWT token cookie not found"})
			ctx.Abort()
			return
		}

		claims := &domain.JwtClaims{}
		// token, err := jwt.ParseWithClaims(tokenString, claims, )

		token, err := jwt.ParseWithClaims(tokenString, claims, func(token *jwt.Token) (interface{}, error) {
			if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
				return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"])
			}
			return jwtSecretKey, nil
		})

		if err != nil {
			if errors.Is(err, jwt.ErrSignatureInvalid) {
				ctx.JSON(http.StatusUnauthorized, gin.H{"error": "Invalid token signature"})
			} else if errors.Is(err, jwt.ErrTokenExpired) || errors.Is(err, jwt.ErrTokenNotValidYet) {
				ctx.JSON(http.StatusUnauthorized, gin.H{"error": "Token expired or not yet valid"})
			} else {
				log.Printf("JWT parsing error: %v", err)
				ctx.JSON(http.StatusUnauthorized, gin.H{"error": "Invalid token"})
			}
			ctx.Abort()
			return
		}

		if !token.Valid {
			ctx.JSON(http.StatusUnauthorized, gin.H{"error": "Invalid token"})
			ctx.Abort()
			return
		}

		// Found: Set the values
		ctx.Set("userId", claims.UserId)
		ctx.Set("userEmail", claims.Email)
		ctx.Next()
	}
}