// internal/middleware/jwt.go
package middleware

import (
	"errors"
	"net/http"
	"strings"

	"github.com/gin-gonic/gin"

	"feedsystem_video_go/internal/account"
	"feedsystem_video_go/internal/auth"
)

// JWTAuth check jwt token and ensure it matches the currently stored token.
func JWTAuth(accountRepo *account.AccountRepository) gin.HandlerFunc {
	return func(c *gin.Context) {
		authHeader := c.GetHeader("Authorization")
		if authHeader == "" {
			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "missing authorization header"})
			return
		}

		parts := strings.SplitN(authHeader, " ", 2)
		if len(parts) != 2 || !strings.EqualFold(parts[0], "Bearer") {
			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "invalid authorization header"})
			return
		}

		tokenString := parts[1]

		claims, err := auth.ParseToken(tokenString)
		if err != nil {
			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "invalid or expired token"})
			return
		}

		accountInfo, err := accountRepo.FindByID(c.Request.Context(), claims.AccountID)
		if err != nil || accountInfo.Token == "" || accountInfo.Token != tokenString {
			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "token has been revoked"})
			return
		}

		c.Set("accountID", claims.AccountID)
		c.Set("username", claims.Username)

		c.Next()
	}
}

func SoftJWTAuth(accountRepo *account.AccountRepository) gin.HandlerFunc {
	return func(c *gin.Context) {
		authHeader := c.GetHeader("Authorization")
		if authHeader == "" {
			c.Next()
			return
		}

		parts := strings.SplitN(authHeader, " ", 2)
		if len(parts) != 2 || !strings.EqualFold(parts[0], "Bearer") {
			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "invalid authorization header"})
			return
		}

		tokenString := parts[1]

		claims, err := auth.ParseToken(tokenString)
		if err != nil {
			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "invalid or expired token"})
			return
		}

		accountInfo, err := accountRepo.FindByID(c.Request.Context(), claims.AccountID)
		if err != nil || accountInfo.Token == "" || accountInfo.Token != tokenString {
			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "token has been revoked"})
			return
		}

		c.Set("accountID", claims.AccountID)
		c.Set("username", claims.Username)

		c.Next()
	}
}
func GetAccountID(c *gin.Context) (uint, error) {
	uidValue, exists := c.Get("accountID")
	if !exists {
		return 0, errors.New("accountID not found")
	}

	accountID, ok := uidValue.(uint)
	if !ok {
		return 0, errors.New("accountID has invalid type")
	}

	return accountID, nil
}