import process from "node:process";

import cors from "cors";
import express from "express";
import { MongoClient } from "mongodb";

import { createMongoConnectionUri } from "../common/mongo/mongo.module.ts";
import { MongoAppStore } from "./mongo-store.ts";
import { detectAssetShapeFromLocalPath } from "./local-source-probe.ts";

export type ApiRuntimeConfig = {
  host: string;
  port: number;
  mongoUri: string;
  database: string;
  corsOrigin: string;
};

export function resolveApiRuntimeConfig(
  env: NodeJS.ProcessEnv = process.env,
): ApiRuntimeConfig {
  const mongoUri =
    env.MONGO_URI ??
    createMongoConnectionUri({
      username: env.MONGO_ROOT_USERNAME ?? "emboflow",
      password: env.MONGO_ROOT_PASSWORD ?? "emboflow",
      host: env.MONGO_HOST ?? "127.0.0.1",
      port: Number(env.MONGO_PORT ?? 27017),
      database: env.MONGO_DB ?? "emboflow",
    });

  return {
    host: env.API_HOST ?? "127.0.0.1",
    port: Number(env.API_PORT ?? 3001),
    mongoUri,
    database: env.MONGO_DB ?? "emboflow",
    corsOrigin: env.CORS_ORIGIN ?? "http://127.0.0.1:3000",
  };
}

export async function createApiRuntime(config = resolveApiRuntimeConfig()) {
  const client = new MongoClient(config.mongoUri);
  await client.connect();
  const db = client.db(config.database);
  const store = new MongoAppStore(db);

  const app = express();
  app.use(cors({ origin: config.corsOrigin, credentials: true }));
  app.use(express.json());

  app.get("/api/health", async (_request, response) => {
    await db.command({ ping: 1 });
    response.json({ status: "ok" });
  });

  app.post("/api/dev/bootstrap", async (request, response, next) => {
    try {
      const result = await store.bootstrapDevContext(request.body ?? {});
      response.json(result);
    } catch (error) {
      next(error);
    }
  });

  app.get("/api/workspaces", async (request, response, next) => {
    try {
      const ownerId = String(request.query.ownerId ?? "local-user");
      response.json(await store.listWorkspaces(ownerId));
    } catch (error) {
      next(error);
    }
  });

  app.post("/api/projects", async (request, response, next) => {
    try {
      response.json(
        await store.createProject({
          workspaceId: request.body.workspaceId,
          name: request.body.name,
          description: request.body.description,
          createdBy: request.body.createdBy ?? "local-user",
        }),
      );
    } catch (error) {
      next(error);
    }
  });

  app.get("/api/projects", async (request, response, next) => {
    try {
      response.json(await store.listProjects(String(request.query.workspaceId)));
    } catch (error) {
      next(error);
    }
  });

  app.post("/api/assets/register", async (request, response, next) => {
    try {
      const sourcePath = request.body.sourcePath as string | undefined;
      const inferred = sourcePath
        ? detectAssetShapeFromLocalPath(sourcePath)
        : undefined;
      response.json(
        await store.registerAsset({
          workspaceId: request.body.workspaceId,
          projectId: request.body.projectId,
          type: request.body.type ?? inferred?.type ?? "folder",
          sourceType: request.body.sourceType ?? inferred?.sourceType ?? "upload",
          displayName: request.body.displayName ?? inferred?.displayName ?? "asset",
          sourcePath,
          createdBy: request.body.createdBy ?? "local-user",
        }),
      );
    } catch (error) {
      next(error);
    }
  });

  app.get("/api/assets", async (request, response, next) => {
    try {
      response.json(await store.listAssets(String(request.query.projectId)));
    } catch (error) {
      next(error);
    }
  });

  app.get("/api/assets/:assetId", async (request, response, next) => {
    try {
      const asset = await store.getAsset(request.params.assetId);
      if (!asset) {
        response.status(404).json({ message: "asset not found" });
        return;
      }
      response.json(asset);
    } catch (error) {
      next(error);
    }
  });

  app.post("/api/assets/:assetId/probe", async (request, response, next) => {
    try {
      response.json(await store.probeAsset(request.params.assetId));
    } catch (error) {
      next(error);
    }
  });

  app.get("/api/assets/:assetId/probe-report", async (request, response, next) => {
    try {
      const report = await store.getLatestProbeReport(request.params.assetId);
      if (!report) {
        response.status(404).json({ message: "probe report not found" });
        return;
      }
      response.json(report);
    } catch (error) {
      next(error);
    }
  });

  app.get("/api/node-definitions", (_request, response) => {
    response.json(store.listNodeDefinitions());
  });

  app.post("/api/workflows", async (request, response, next) => {
    try {
      response.json(
        await store.createWorkflowDefinition({
          workspaceId: request.body.workspaceId,
          projectId: request.body.projectId,
          name: request.body.name,
          createdBy: request.body.createdBy ?? "local-user",
        }),
      );
    } catch (error) {
      next(error);
    }
  });

  app.get("/api/workflows", async (request, response, next) => {
    try {
      response.json(await store.listWorkflowDefinitions(String(request.query.projectId)));
    } catch (error) {
      next(error);
    }
  });

  app.get("/api/workflows/:workflowDefinitionId", async (request, response, next) => {
    try {
      const definition = await store.getWorkflowDefinition(request.params.workflowDefinitionId);
      if (!definition) {
        response.status(404).json({ message: "workflow definition not found" });
        return;
      }
      response.json(definition);
    } catch (error) {
      next(error);
    }
  });

  app.post("/api/workflows/:workflowDefinitionId/versions", async (request, response, next) => {
    try {
      response.json(
        await store.saveWorkflowVersion({
          workflowDefinitionId: request.params.workflowDefinitionId,
          visualGraph: request.body.visualGraph ?? {},
          logicGraph: request.body.logicGraph,
          runtimeGraph: request.body.runtimeGraph ?? {},
          pluginRefs: request.body.pluginRefs ?? [],
          createdBy: request.body.createdBy ?? "local-user",
        }),
      );
    } catch (error) {
      next(error);
    }
  });

  app.get("/api/workflows/:workflowDefinitionId/versions", async (request, response, next) => {
    try {
      response.json(await store.listWorkflowVersions(request.params.workflowDefinitionId));
    } catch (error) {
      next(error);
    }
  });

  app.post("/api/runs", async (request, response, next) => {
    try {
      response.json(
        await store.createRun({
          workflowDefinitionId: request.body.workflowDefinitionId,
          workflowVersionId: request.body.workflowVersionId,
          triggeredBy: request.body.triggeredBy ?? "local-user",
        }),
      );
    } catch (error) {
      next(error);
    }
  });

  app.get("/api/runs/:runId", async (request, response, next) => {
    try {
      const run = await store.getRun(request.params.runId);
      if (!run) {
        response.status(404).json({ message: "run not found" });
        return;
      }
      response.json(run);
    } catch (error) {
      next(error);
    }
  });

  app.get("/api/runs/:runId/tasks", async (request, response, next) => {
    try {
      response.json(await store.listRunTasks(request.params.runId));
    } catch (error) {
      next(error);
    }
  });

  app.post("/api/artifacts", async (request, response, next) => {
    try {
      response.json(
        await store.createArtifact({
          type: request.body.type,
          title: request.body.title,
          producerType: request.body.producerType,
          producerId: request.body.producerId,
          payload: request.body.payload ?? {},
        }),
      );
    } catch (error) {
      next(error);
    }
  });

  app.get("/api/artifacts", async (request, response, next) => {
    try {
      response.json(
        await store.listArtifactsByProducer(
          String(request.query.producerType),
          String(request.query.producerId),
        ),
      );
    } catch (error) {
      next(error);
    }
  });

  app.get("/api/artifacts/:artifactId", async (request, response, next) => {
    try {
      const artifact = await store.getArtifact(request.params.artifactId);
      if (!artifact) {
        response.status(404).json({ message: "artifact not found" });
        return;
      }
      response.json(artifact);
    } catch (error) {
      next(error);
    }
  });

  app.use(
    (
      error: unknown,
      _request: express.Request,
      response: express.Response,
      _next: express.NextFunction,
    ) => {
      const message = error instanceof Error ? error.message : "unknown error";
      response.status(400).json({ message });
    },
  );

  return { app, client, db, store, config };
}

export async function startApiServer(config = resolveApiRuntimeConfig()) {
  const runtime = await createApiRuntime(config);

  return new Promise<{
    close: () => Promise<void>;
    port: number;
  }>((resolve) => {
    const server = runtime.app.listen(config.port, config.host, () => {
      resolve({
        port: config.port,
        close: async () => {
          await new Promise<void>((done, reject) => {
            server.close((error) => {
              if (error) {
                reject(error);
                return;
              }
              done();
            });
          });
          await runtime.client.close();
        },
      });
    });
  });
}