import { mkdir } from "node:fs/promises";
import { join, resolve } from "node:path";
import { pathToFileURL } from "node:url";
import {
  FileAttachmentStore,
  HarnessSession,
  InMemoryApprovalBroker,
  InMemoryEventStore,
  InMemoryModelConnectionStore,
  InMemorySessionRegistry,
  SafeWorkspace,
  SkillCatalog,
  SkillEventInference,
  createMockAdsMetricsTool,
  createPiAgentSessionPortFactory,
  createSaveReportDraftTool,
  validateBaseUrl,
} from "@agent-studio/harness";
import type { ModelConnectionInput } from "@agent-studio/shared";
import { buildApp } from "./app.js";
import { loadServerConfig } from "./config.js";

export async function buildDefaultApp(environment: NodeJS.ProcessEnv = process.env) {
  const config = loadServerConfig(environment);
  const projectRoot = process.cwd();
  const sessionsRoot = resolve(projectRoot, config.sessionsRoot);
  const agentDir = resolve(projectRoot, config.agentDir);
  await mkdir(sessionsRoot, { recursive: true, mode: 0o700 });
  await mkdir(agentDir, { recursive: true, mode: 0o700 });

  const eventStore = new InMemoryEventStore();
  const skillCatalog = new SkillCatalog({
    cwd: projectRoot,
    agentDir,
    ...(environment.AGENT_SKILLS_DIRS === undefined
      ? {}
      : { extraDirsValue: environment.AGENT_SKILLS_DIRS }),
  });
  await skillCatalog.reload();
  const environmentConnection = await readEnvironmentConnection(environment, config.allowPrivateLlmBaseUrls);
  const modelStore = new InMemoryModelConnectionStore({
    ...(environmentConnection === undefined ? {} : { environment: environmentConnection }),
    validateUrl: (url) => validateBaseUrl(url, {
      allowPrivateNetwork: config.allowPrivateLlmBaseUrls,
      allowLocalhostHttp: environment.NODE_ENV !== "production",
    }),
  });
  const approvalBroker = new InMemoryApprovalBroker({
    eventStore,
    timeoutMs: config.approvalTimeoutMs,
  });
  const attachmentStore = new FileAttachmentStore({
    sessionsRoot,
    eventStore,
    maxBytes: config.maxImageBytes,
    maxAttachmentsPerMessage: config.maxImagesPerMessage,
  });
  const registry = new InMemorySessionRegistry<HarnessSession>({
    sessionsRoot,
    createSession: ({ sessionId, workspaceRoot }) => {
      eventStore.append(sessionId, { type: "session.started", payload: { cwd: "." } });
      return new HarnessSession({
        sessionId,
        workspaceRoot,
        eventStore,
        modelStore,
        attachmentStore,
        approvalBroker,
        runTimeoutMs: config.runTimeoutMs,
        createSkillInference: (runId) => new SkillEventInference({
          sessionId,
          runId,
          eventStore,
          skillIndex: skillCatalog.index(),
        }),
        createAgentPort: async (input) => {
          const workspace = await SafeWorkspace.create(workspaceRoot);
          return createPiAgentSessionPortFactory({
            agentDir,
            approvalBroker,
            customTools: [
              createMockAdsMetricsTool(join(projectRoot, "fixtures", "ads-account.json")),
              createSaveReportDraftTool(workspace),
            ],
          })(input);
        },
      });
    },
  });

  return buildApp({
    sessionRegistry: registry,
    skillCatalog,
    modelStore,
    attachmentStore,
    approvalBroker,
  });
}

async function readEnvironmentConnection(
  environment: NodeJS.ProcessEnv,
  allowPrivateNetwork: boolean,
): Promise<ModelConnectionInput | undefined> {
  const providerId = environment.AGENT_PROVIDER?.trim();
  const modelId = environment.AGENT_MODEL?.trim();
  if (providerId === undefined || providerId === "" || modelId === undefined || modelId === "") return undefined;
  const api = environment.LLM_API ?? "openai-responses";
  if (api !== "openai-responses" && api !== "openai-completions" && api !== "anthropic-messages") return undefined;
  const rawBaseUrl = environment.LLM_BASE_URL?.trim();
  const baseUrl = rawBaseUrl === undefined || rawBaseUrl === ""
    ? undefined
    : (await validateBaseUrl(rawBaseUrl, {
      allowPrivateNetwork,
      allowLocalhostHttp: environment.NODE_ENV !== "production",
    })).normalizedUrl;
  const apiKey = providerId === "anthropic"
    ? environment.ANTHROPIC_API_KEY?.trim()
    : environment.OPENAI_API_KEY?.trim();
  return {
    providerId,
    modelId,
    api,
    supportsImages: environment.AGENT_MODEL_SUPPORTS_IMAGES !== "false",
    ...(baseUrl === undefined ? {} : { baseUrl }),
    ...(apiKey === undefined || apiKey === "" ? {} : { apiKey }),
  };
}

const entryPoint = process.argv[1];
if (entryPoint !== undefined && import.meta.url === pathToFileURL(entryPoint).href) {
  const config = loadServerConfig(process.env);
  const app = await buildDefaultApp();
  await app.listen({ host: config.host, port: config.port });
}