import { Router } from "express";
import type { Db } from "@paperclip/db";
import {
  createAgentKeySchema,
  createAgentSchema,
  updateAgentSchema,
} from "@paperclip/shared";
import { validate } from "../middleware/validate.js";
import { agentService, heartbeatService, logActivity } from "../services/index.js";
import { assertBoard, assertCompanyAccess, getActorInfo } from "./authz.js";

export function agentRoutes(db: Db) {
  const router = Router();
  const svc = agentService(db);
  const heartbeat = heartbeatService(db);

  router.get("/companies/:companyId/agents", async (req, res) => {
    const companyId = req.params.companyId as string;
    assertCompanyAccess(req, companyId);
    const result = await svc.list(companyId);
    res.json(result);
  });

  router.get("/companies/:companyId/org", async (req, res) => {
    const companyId = req.params.companyId as string;
    assertCompanyAccess(req, companyId);
    const tree = await svc.orgForCompany(companyId);
    res.json(tree);
  });

  router.get("/agents/:id", async (req, res) => {
    const id = req.params.id as string;
    const agent = await svc.getById(id);
    if (!agent) {
      res.status(404).json({ error: "Agent not found" });
      return;
    }
    assertCompanyAccess(req, agent.companyId);
    res.json(agent);
  });

  router.post("/companies/:companyId/agents", validate(createAgentSchema), async (req, res) => {
    const companyId = req.params.companyId as string;
    assertCompanyAccess(req, companyId);

    if (req.actor.type === "agent") {
      assertBoard(req);
    }

    const agent = await svc.create(companyId, {
      ...req.body,
      status: "idle",
      spentMonthlyCents: 0,
      lastHeartbeatAt: null,
    });

    const actor = getActorInfo(req);
    await logActivity(db, {
      companyId,
      actorType: actor.actorType,
      actorId: actor.actorId,
      agentId: actor.agentId,
      action: "agent.created",
      entityType: "agent",
      entityId: agent.id,
      details: { name: agent.name, role: agent.role },
    });

    res.status(201).json(agent);
  });

  router.patch("/agents/:id", validate(updateAgentSchema), async (req, res) => {
    const id = req.params.id as string;
    const existing = await svc.getById(id);
    if (!existing) {
      res.status(404).json({ error: "Agent not found" });
      return;
    }
    assertCompanyAccess(req, existing.companyId);

    if (req.actor.type === "agent" && req.actor.agentId !== id) {
      res.status(403).json({ error: "Agent can only modify itself" });
      return;
    }

    const agent = await svc.update(id, req.body);
    if (!agent) {
      res.status(404).json({ error: "Agent not found" });
      return;
    }

    const actor = getActorInfo(req);
    await logActivity(db, {
      companyId: agent.companyId,
      actorType: actor.actorType,
      actorId: actor.actorId,
      agentId: actor.agentId,
      action: "agent.updated",
      entityType: "agent",
      entityId: agent.id,
      details: req.body,
    });

    res.json(agent);
  });

  router.post("/agents/:id/pause", async (req, res) => {
    assertBoard(req);
    const id = req.params.id as string;
    const agent = await svc.pause(id);
    if (!agent) {
      res.status(404).json({ error: "Agent not found" });
      return;
    }

    await heartbeat.cancelActiveForAgent(id);

    await logActivity(db, {
      companyId: agent.companyId,
      actorType: "user",
      actorId: req.actor.userId ?? "board",
      action: "agent.paused",
      entityType: "agent",
      entityId: agent.id,
    });

    res.json(agent);
  });

  router.post("/agents/:id/resume", async (req, res) => {
    assertBoard(req);
    const id = req.params.id as string;
    const agent = await svc.resume(id);
    if (!agent) {
      res.status(404).json({ error: "Agent not found" });
      return;
    }

    await logActivity(db, {
      companyId: agent.companyId,
      actorType: "user",
      actorId: req.actor.userId ?? "board",
      action: "agent.resumed",
      entityType: "agent",
      entityId: agent.id,
    });

    res.json(agent);
  });

  router.post("/agents/:id/terminate", async (req, res) => {
    assertBoard(req);
    const id = req.params.id as string;
    const agent = await svc.terminate(id);
    if (!agent) {
      res.status(404).json({ error: "Agent not found" });
      return;
    }

    await heartbeat.cancelActiveForAgent(id);

    await logActivity(db, {
      companyId: agent.companyId,
      actorType: "user",
      actorId: req.actor.userId ?? "board",
      action: "agent.terminated",
      entityType: "agent",
      entityId: agent.id,
    });

    res.json(agent);
  });

  router.post("/agents/:id/keys", validate(createAgentKeySchema), async (req, res) => {
    assertBoard(req);
    const id = req.params.id as string;
    const key = await svc.createApiKey(id, req.body.name);

    const agent = await svc.getById(id);
    if (agent) {
      await logActivity(db, {
        companyId: agent.companyId,
        actorType: "user",
        actorId: req.actor.userId ?? "board",
        action: "agent.key_created",
        entityType: "agent",
        entityId: agent.id,
        details: { keyId: key.id, name: key.name },
      });
    }

    res.status(201).json(key);
  });

  router.post("/agents/:id/heartbeat/invoke", async (req, res) => {
    const id = req.params.id as string;
    const agent = await svc.getById(id);
    if (!agent) {
      res.status(404).json({ error: "Agent not found" });
      return;
    }
    assertCompanyAccess(req, agent.companyId);

    if (req.actor.type === "agent" && req.actor.agentId !== id) {
      res.status(403).json({ error: "Agent can only invoke itself" });
      return;
    }

    const run = await heartbeat.invoke(id, "manual", {
      triggeredBy: req.actor.type,
      actorId: req.actor.type === "agent" ? req.actor.agentId : req.actor.userId,
    });

    const actor = getActorInfo(req);
    await logActivity(db, {
      companyId: agent.companyId,
      actorType: actor.actorType,
      actorId: actor.actorId,
      agentId: actor.agentId,
      action: "heartbeat.invoked",
      entityType: "heartbeat_run",
      entityId: run.id,
      details: { agentId: id },
    });

    res.status(202).json(run);
  });

  router.get("/companies/:companyId/heartbeat-runs", async (req, res) => {
    const companyId = req.params.companyId as string;
    assertCompanyAccess(req, companyId);
    const agentId = req.query.agentId as string | undefined;
    const runs = await heartbeat.list(companyId, agentId);
    res.json(runs);
  });

  router.post("/heartbeat-runs/:runId/cancel", async (req, res) => {
    assertBoard(req);
    const runId = req.params.runId as string;
    const run = await heartbeat.cancelRun(runId);

    if (run) {
      await logActivity(db, {
        companyId: run.companyId,
        actorType: "user",
        actorId: req.actor.userId ?? "board",
        action: "heartbeat.cancelled",
        entityType: "heartbeat_run",
        entityId: run.id,
        details: { agentId: run.agentId },
      });
    }

    res.json(run);
  });

  return router;
}