package middleware

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

	"github.com/99designs/gqlgen/graphql"

	"gitea.unbound.se/unboundsoftware/schemas/domain"
)

const (
	UserKey         = ContextKey("user")
	OrganizationKey = ContextKey("organization")
)

type Cache interface {
	OrganizationByAPIKey(apiKey string) *domain.Organization
}

func NewAuth(cache Cache) *AuthMiddleware {
	return &AuthMiddleware{
		cache: cache,
	}
}

type AuthMiddleware struct {
	cache Cache
}

func (m *AuthMiddleware) Handler(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		ctx := r.Context()
		claims := ClaimsFromContext(r.Context())
		if claims != nil {
			ctx = context.WithValue(ctx, UserKey, claims.RegisteredClaims.Subject)
		}
		apiKey, err := ApiKeyFromContext(r.Context())
		if err != nil {
			w.WriteHeader(http.StatusInternalServerError)
			_, _ = w.Write([]byte("Invalid API Key format"))
			return
		}
		// Cache handles hash comparison internally
		organization := m.cache.OrganizationByAPIKey(apiKey)
		if organization != nil {
			ctx = context.WithValue(ctx, OrganizationKey, *organization)
		}

		next.ServeHTTP(w, r.WithContext(ctx))
	})
}

func UserFromContext(ctx context.Context) string {
	if value := ctx.Value(UserKey); value != nil {
		if u, ok := value.(string); ok {
			return u
		}
	}
	return ""
}

func UserHasRole(ctx context.Context, role string) bool {
	claims := ClaimsFromContext(ctx)
	if claims == nil {
		return false
	}

	customClaims, ok := claims.CustomClaims.(*CustomClaims)
	if !ok || customClaims == nil {
		return false
	}

	for _, r := range customClaims.Roles {
		if r == role {
			return true
		}
	}

	return false
}

func OrganizationFromContext(ctx context.Context) string {
	if value := ctx.Value(OrganizationKey); value != nil {
		if u, ok := value.(domain.Organization); ok {
			return u.ID.String()
		}
	}
	return ""
}

func (m *AuthMiddleware) Directive(ctx context.Context, _ interface{}, next graphql.Resolver, user *bool, organization *bool) (res interface{}, err error) {
	userRequired := user != nil && *user
	orgRequired := organization != nil && *organization

	u := UserFromContext(ctx)
	orgId := OrganizationFromContext(ctx)

	fmt.Printf("[Auth Directive] userRequired=%v, orgRequired=%v, hasUser=%v, hasOrg=%v\n",
		userRequired, orgRequired, u != "", orgId != "")

	// If both are required, it means EITHER is acceptable (OR logic)
	if userRequired && orgRequired {
		if u == "" && orgId == "" {
			fmt.Printf("[Auth Directive] REJECTED: Neither user nor organization available\n")
			return nil, fmt.Errorf("authentication required: provide either user token or organization API key")
		}
		fmt.Printf("[Auth Directive] ACCEPTED: Has user=%v OR organization=%v\n", u != "", orgId != "")
		return next(ctx)
	}

	// Only user required
	if userRequired {
		if u == "" {
			fmt.Printf("[Auth Directive] REJECTED: No user available\n")
			return nil, fmt.Errorf("no user available in request")
		}
		fmt.Printf("[Auth Directive] ACCEPTED: User authenticated\n")
	}

	// Only organization required
	if orgRequired {
		if orgId == "" {
			fmt.Printf("[Auth Directive] REJECTED: No organization available\n")
			return nil, fmt.Errorf("no organization available in request")
		}
		fmt.Printf("[Auth Directive] ACCEPTED: Organization authenticated\n")
	}

	return next(ctx)
}