package handlers

import (
	"net/http"
	"strings"

	"github.com/gin-gonic/gin"
	"github.com/imc-vibe/backend/internal/auth"
)

const AuthContextKey = "auth"

func AuthMiddleware(jwtManager *auth.JWTManager) gin.HandlerFunc {
	return func(c *gin.Context) {
		authHeader := c.GetHeader("Authorization")
		if authHeader == "" {
			c.AbortWithStatusJSON(http.StatusUnauthorized, Response{Error: "authorization header required"})
			return
		}

		parts := strings.SplitN(authHeader, " ", 2)
		if len(parts) != 2 || strings.ToLower(parts[0]) != "bearer" {
			c.AbortWithStatusJSON(http.StatusUnauthorized, Response{Error: "invalid authorization header format"})
			return
		}

		claims, err := jwtManager.ValidateToken(parts[1])
		if err != nil {
			c.AbortWithStatusJSON(http.StatusUnauthorized, Response{Error: "invalid token"})
			return
		}

		authCtx := &auth.Context{
			UserID:   claims.UserID,
			Username: claims.Username,
			Role:     auth.Role(claims.Role),
		}

		c.Set(AuthContextKey, authCtx)
		c.Next()
	}
}

func GetAuthContext(c *gin.Context) *auth.Context {
	if ctx, exists := c.Get(AuthContextKey); exists {
		if authCtx, ok := ctx.(*auth.Context); ok {
			return authCtx
		}
	}
	return nil
}

func RequireAdmin() gin.HandlerFunc {
	return func(c *gin.Context) {
		authCtx := GetAuthContext(c)
		if authCtx == nil || !authCtx.IsAdmin() {
			c.AbortWithStatusJSON(http.StatusForbidden, Response{Error: "admin access required"})
			return
		}
		c.Next()
	}
}