package com.airlock.iam.oauth2.infrastructure.resource.rest;

import com.airlock.iam.base.misc.log.LogUtil;
import com.airlock.iam.base.misc.result.Result;
import com.airlock.iam.common.api.domain.model.user.PersistentUser;
import com.airlock.iam.common.api.infrastructure.annotation.DisableCsrfFilter;
import com.airlock.iam.common.api.infrastructure.annotation.RequiresWritableSession;
import com.airlock.iam.elog.api.ELogger;
import com.airlock.iam.elog.api.ELoggerFactory;
import com.airlock.iam.oauth2.api.domain.model.OAuth2Scope;
import com.airlock.iam.oauth2.application.service.OAuth2ResourceService;
import com.airlock.iam.oauth2.domain.model.credential.OAuth2AccessInfo;
import com.airlock.iam.oauth2.domain.model.resource.OAuth2ResourceResult;
import com.airlock.iam.oauth2.domain.model.validation.OAuth2ValidationResult;
import com.airlock.iam.oauth2.infrastructure.transfer.documentation.OAuth2ResourceEndpointResponseData;
import com.airlock.iam.oauth2.infrastructure.validation.AuthorizationServerIdValidator;
import com.airlock.iam.oauth2.infrastructure.validation.OAuth2ResourceAccess;
import com.airlock.iam.oauth2.infrastructure.validation.availability.OAuth2ResourceAvailability;
import io.swagger.v3.oas.annotations.Operation;
import io.swagger.v3.oas.annotations.Parameter;
import io.swagger.v3.oas.annotations.media.Content;
import io.swagger.v3.oas.annotations.media.Schema;
import io.swagger.v3.oas.annotations.responses.ApiResponse;
import io.swagger.v3.oas.annotations.responses.ApiResponses;
import jakarta.inject.Inject;
import jakarta.inject.Provider;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.validation.constraints.Size;
import jakarta.ws.rs.GET;
import jakarta.ws.rs.POST;
import jakarta.ws.rs.Path;
import jakarta.ws.rs.PathParam;
import jakarta.ws.rs.Produces;
import jakarta.ws.rs.core.Response;
import jakarta.ws.rs.core.Response.Status;
import java.util.Set;

@Path("/authorization-servers/{authorizationServerId}/resources/{resourceName}")
public class OAuth2ResourceEndpointResource {
   private static final ELogger LOG = ELoggerFactory.getLogger(OAuth2ResourceEndpointResource.class);
   private final Provider<OAuth2ResourceAvailability> resourceAvailability;
   private final Provider<OAuth2ResourceAccess> accessValidator;
   private final Provider<OAuth2ResourceService> resourceService;
   private final HttpServletRequest request;
   private final Provider<AuthorizationServerIdValidator> authorizationServerIdValidator;

   @Inject
   public OAuth2ResourceEndpointResource(
      Provider<OAuth2ResourceAvailability> resourceAvailability,
      Provider<OAuth2ResourceAccess> accessValidator,
      Provider<OAuth2ResourceService> resourceService,
      HttpServletRequest request,
      Provider<AuthorizationServerIdValidator> authorizationServerIdValidator
   ) {
      this.resourceAvailability = resourceAvailability;
      this.accessValidator = accessValidator;
      this.resourceService = resourceService;
      this.request = request;
      this.authorizationServerIdValidator = authorizationServerIdValidator;
   }

   @ApiResponses(
      {
            @ApiResponse(
               responseCode = "200",
               description = "Retrieved the OAuth 2.0 resource.",
               content = @Content(mediaType = "application/json", schema = @Schema(implementation = OAuth2ResourceEndpointResponseData.class))
            ),
            @ApiResponse(
               responseCode = "401",
               description = "The access token is missing or invalid.",
               content = {
                     @Content(mediaType = "application/vnd.api+json", schema = @Schema(ref = "json-api.yaml#/components/schemas/ErrorDocumentResponse")),
                     @Content(mediaType = "application/json", schema = @Schema(ref = "#/components/schemas/OAuth2ErrorResponse"))
               }
            ),
            @ApiResponse(
               responseCode = "404",
               description = "<div class=\"iam-error-code\"><table>\n<tr>\n<td>-</td>\n<td>No resource endpoint with the specified name available.</td>\n</tr>\n<tr>\n<td>AUTHORIZATION_SERVER_NOT_FOUND</td>\n<td>The authorization server ID does not exist.</td>\n</tr>\n</table>\n</div>\n",
               content = {
                     @Content(mediaType = "application/vnd.api+json", schema = @Schema(ref = "json-api.yaml#/components/schemas/ErrorDocumentResponse")),
                     @Content(mediaType = "application/json", schema = @Schema(ref = "#/components/schemas/OAuth2ErrorResponse"))
               }
            )
      }
   )
   @GET
   @Operation(
      description = "Retrieves the specified OAuth 2.0 resource. An access token in the bearer token format must be provided as authorization.\n<div class=\"iam-resource-return\">The resource.</div>",
      tags = "OAuth 2.0/OIDC",
      summary = "Get resource"
   )
   @Produces("application/json")
   @DisableCsrfFilter
   @RequiresWritableSession
   public Response retrieveResourceUsingGet(
      @Parameter(description = "The authorization server ID.") @PathParam("authorizationServerId") String authorizationServerId,
      @Parameter(description = "The name to the resource.") @PathParam("resourceName") String resourceName
   ) {
      ((AuthorizationServerIdValidator)this.authorizationServerIdValidator.get()).validateAuthorizationServer(authorizationServerId);
      return this.retrieveResource(resourceName);
   }

   @ApiResponses(
      {
            @ApiResponse(
               responseCode = "200",
               description = "Retrieved the OAuth 2.0 resource.",
               content = @Content(mediaType = "application/json", schema = @Schema(implementation = OAuth2ResourceEndpointResponseData.class))
            ),
            @ApiResponse(
               responseCode = "401",
               description = "The access token is missing or invalid.",
               content = @Content(mediaType = "application/json", schema = @Schema(ref = "json-api.yaml#/components/schemas/ErrorDocumentResponse"))
            ),
            @ApiResponse(
               responseCode = "404",
               description = "<div class=\"iam-error-code\"><table>\n<tr>\n<td>-</td>\n<td>No resource endpoint with the specified name available.</td>\n</tr>\n<tr>\n<td>AUTHORIZATION_SERVER_NOT_FOUND</td>\n<td>The authorization server ID does not exist.</td>\n</tr>\n</table>\n</div>\n",
               content = @Content(mediaType = "application/json", schema = @Schema(ref = "json-api.yaml#/components/schemas/ErrorDocumentResponse"))
            )
      }
   )
   @POST
   @Operation(
      description = "Retrieves the specified OAuth 2.0 resource. An access token in the bearer token format must be provided as authorization.\n<div class=\"iam-resource-return\">The resource.</div>",
      tags = "OAuth 2.0/OIDC",
      summary = "Get resource"
   )
   @Produces("application/json")
   @DisableCsrfFilter
   public Response retrieveResourceUsingPost(
      @Parameter(description = "The authorization server ID.") @PathParam("authorizationServerId") String authorizationServerId,
      @Parameter(description = "The name to the resource.") @PathParam("resourceName") @Size(min = 1, max = 10000) String resourceName
   ) {
      ((AuthorizationServerIdValidator)this.authorizationServerIdValidator.get()).validateAuthorizationServer(authorizationServerId);
      return this.retrieveResource(resourceName);
   }

   private Response retrieveResource(String resourceName) {
      if (!((OAuth2ResourceAvailability)this.resourceAvailability.get()).isAvailable()) {
         LOG.info("No OAuth 2.0 resource configuration for name " + LogUtil.logSafeQuote(resourceName) + " found");
         return Response.status(Status.NOT_FOUND).build();
      }

      Result<OAuth2AccessInfo, OAuth2ValidationResult> accessResult = ((OAuth2ResourceAccess)this.accessValidator.get()).validateAccess(this.request);
      if (accessResult.isFailure()) {
         return OAuth2ErrorResponse.map(accessResult.getFailure()).build();
      }

      OAuth2AccessInfo accessInfo = accessResult.get();
      Set<OAuth2Scope> scopes = accessInfo.getAccessToken().getScopes().scopesAsSet();
      PersistentUser user = accessInfo.getValidUser();
      Result<OAuth2ResourceResult, OAuth2ValidationResult> resources = ((OAuth2ResourceService)this.resourceService.get())
         .getMatchingResource(scopes, user, accessInfo.getAccessToken().getClientId());
      return resources.isFailure() ? OAuth2ErrorResponse.map(resources.getFailure()).build() : Response.ok(resources.get().getMap()).build();
   }
}