#!/usr/bin/env node

import { spawn } from "node:child_process";
import { createServer } from "node:http";
import { access, readFile, readdir, rm } from "node:fs/promises";
import os from "node:os";
import { join, resolve } from "node:path";

async function loadConfig(configPath) {
  const raw = await readFile(resolve(configPath), "utf8");
  return JSON.parse(raw);
}

async function postHeartbeat(config, runtime) {
  const response = await fetch(`${config.controlPlaneUrl.replace(/\/$/, "")}/api/device-heartbeat`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({
      deviceId: config.deviceId,
      token: runtime.issuedToken ?? config.token,
      pairingCode: runtime.issuedToken ? undefined : config.pairingCode,
      name: config.name,
      avatar: config.avatar,
      account: config.account,
      status: config.status,
      quota5h: config.quota5h,
      quota7d: config.quota7d,
      projects: config.projects,
      endpoint: config.endpoint,
    }),
  });

  const text = await response.text();
  let json = null;
  try {
    json = JSON.parse(text);
  } catch {
    json = null;
  }
  return {
    ok: response.ok,
    status: response.status,
    body: text,
    json,
  };
}

function deviceTokenHeaders(config, runtime) {
  const token = runtime.issuedToken ?? config.token;
  return token ? { "x-boss-device-token": token } : {};
}

async function postThreadContext(config, runtime, snapshot) {
  const workerId = snapshot.workerId ?? config.workerId ?? `${config.deviceId}-worker`;
  const response = await fetch(
    `${config.controlPlaneUrl.replace(/\/$/, "")}/api/v1/workers/${workerId}/thread-context`,
    {
      method: "POST",
      headers: {
        "Content-Type": "application/json",
        ...deviceTokenHeaders(config, runtime),
      },
      body: JSON.stringify({
        nodeId: config.deviceId,
        projectId: snapshot.projectId,
        taskId: snapshot.taskId,
        threadId: snapshot.threadId,
        title: snapshot.title,
        summary: snapshot.summary,
        sourceKind: snapshot.sourceKind ?? "worker_estimator",
        status: snapshot.status ?? "running",
        contextBudgetRemainingPct: snapshot.contextBudgetRemainingPct,
        contextBudgetLevel: snapshot.contextBudgetLevel,
        compactionExpectedAt: snapshot.compactionExpectedAt,
        mustFinishBeforeCompaction: snapshot.mustFinishBeforeCompaction,
        estimatedRemainingTurns: snapshot.estimatedRemainingTurns ?? 0,
        estimatedRemainingLargeMessages: snapshot.estimatedRemainingLargeMessages ?? 0,
        lastCompactionAt: snapshot.lastCompactionAt,
        compactionCount: snapshot.compactionCount ?? 0,
        patchPending: snapshot.patchPending ?? false,
        testsPending: snapshot.testsPending ?? false,
        evidencePending: snapshot.evidencePending ?? false,
        checklist: snapshot.checklist ?? [],
        capturedAt: new Date().toISOString(),
      }),
    },
  );

  return {
    ok: response.ok,
    status: response.status,
    body: await response.text(),
    workerId,
    threadId: snapshot.threadId,
  };
}

function parseSkillDescription(content) {
  const descriptionMatch = content.match(/description:\s*(.+)/);
  if (descriptionMatch?.[1]) {
    return descriptionMatch[1].trim().replace(/^["']|["']$/g, "");
  }
  const lines = content
    .split("\n")
    .map((line) => line.trim())
    .filter(Boolean);
  return lines.find((line) => !line.startsWith("---") && !line.startsWith("#")) ?? "未提供说明";
}

async function discoverSkills(config) {
  const skillsDir = resolve(config.skillsDir ?? join(os.homedir(), ".codex/skills"));
  const pending = [skillsDir];
  const skills = [];

  while (pending.length > 0) {
    const currentDir = pending.pop();
    if (!currentDir) continue;

    let entries = [];
    try {
      entries = await readdir(currentDir, { withFileTypes: true });
    } catch {
      continue;
    }

    for (const entry of entries) {
      if (entry.isDirectory()) {
        pending.push(join(currentDir, entry.name));
        continue;
      }
      if (!entry.isFile() || entry.name !== "SKILL.md") continue;

      const skillPath = join(currentDir, entry.name);
      try {
        await access(skillPath);
        const content = await readFile(skillPath, "utf8");
        const skillName = currentDir.split("/").pop() ?? "unknown-skill";
        const relativeCategory = currentDir
          .replace(`${skillsDir}/`, "")
          .split("/")
          .slice(0, -1)
          .join(" / ");
        skills.push({
          name: skillName,
          description: parseSkillDescription(content),
          path: skillPath,
          invocation: `[$${skillName}](${skillPath})`,
          category: relativeCategory || config.name,
        });
      } catch {
        continue;
      }
    }
  }

  return skills.sort((a, b) => a.name.localeCompare(b.name));
}

async function postSkills(config, skills) {
  const response = await fetch(
    `${config.controlPlaneUrl.replace(/\/$/, "")}/api/v1/devices/${config.deviceId}/skills`,
    {
      method: "POST",
      headers: {
        "Content-Type": "application/json",
        ...deviceTokenHeaders(config, runtime),
      },
      body: JSON.stringify({ skills }),
    },
  );

  return {
    ok: response.ok,
    status: response.status,
    body: await response.text(),
    count: skills.length,
  };
}

async function postAppLog(config, payload) {
  try {
    await fetch(`${config.controlPlaneUrl.replace(/\/$/, "")}/api/v1/app-logs`, {
      method: "POST",
      headers: {
        "Content-Type": "application/json",
        ...deviceTokenHeaders(config, runtime),
      },
      body: JSON.stringify({
        deviceId: config.deviceId,
        source: "local_agent",
        ...payload,
      }),
    });
  } catch {
    // Ignore log transport failures to avoid blocking the agent loop.
  }
}

async function claimMasterAgentTask(config, runtime) {
  const response = await fetch(
    `${config.controlPlaneUrl.replace(/\/$/, "")}/api/v1/master-agent/tasks/claim`,
    {
      method: "POST",
      headers: {
        "Content-Type": "application/json",
        ...deviceTokenHeaders(config, runtime),
      },
      body: JSON.stringify({ deviceId: config.deviceId }),
    },
  );

  return {
    ok: response.ok,
    status: response.status,
    body: await response.text(),
  };
}

async function completeMasterAgentTask(config, runtime, payload) {
  const response = await fetch(
    `${config.controlPlaneUrl.replace(/\/$/, "")}/api/v1/master-agent/tasks/${payload.taskId}/complete`,
    {
      method: "POST",
      headers: {
        "Content-Type": "application/json",
        ...deviceTokenHeaders(config, runtime),
      },
      body: JSON.stringify({
        deviceId: config.deviceId,
        status: payload.status,
        replyBody: payload.replyBody,
        errorMessage: payload.errorMessage,
        requestId: payload.requestId,
      }),
    },
  );

  return {
    ok: response.ok,
    status: response.status,
    body: await response.text(),
  };
}

function buildCodexArgs(config, outputFile, prompt) {
  const args = [
    "exec",
    "--ephemeral",
    "--skip-git-repo-check",
    "-C",
    config.masterAgentWorkdir || process.cwd(),
    "-s",
    config.masterAgentSandbox || "workspace-write",
    "-o",
    outputFile,
  ];
  if (config.masterAgentModel) {
    args.push("-m", config.masterAgentModel);
  }
  args.push(prompt);
  return args;
}

async function runMasterAgentTask(config, runtime, task) {
  const outputFile = join(os.tmpdir(), `${task.taskId}.reply.txt`);
  const stderrChunks = [];
  runtime.activeMasterTask = {
    taskId: task.taskId,
    status: "running",
    startedAt: new Date().toISOString(),
  };

  try {
    await new Promise((resolveTask, rejectTask) => {
      const child = spawn("codex", buildCodexArgs(config, outputFile, task.executionPrompt), {
        cwd: config.masterAgentWorkdir || process.cwd(),
        env: process.env,
      });

      child.stderr.on("data", (chunk) => {
        stderrChunks.push(String(chunk));
      });

      child.on("error", rejectTask);
      child.on("close", (code) => {
        if (code === 0) {
          resolveTask();
          return;
        }
        rejectTask(new Error(stderrChunks.join("").trim() || `codex exit code ${code}`));
      });
    });

    const replyBody = (await readFile(outputFile, "utf8")).trim();
    const completion = await completeMasterAgentTask(config, runtime, {
      taskId: task.taskId,
      status: "completed",
      replyBody,
    });
    runtime.activeMasterTask = {
      taskId: task.taskId,
      status: completion.ok ? "completed" : "complete_failed",
      completedAt: new Date().toISOString(),
      detail: completion.body,
    };
    await postAppLog(config, {
      projectId: "master-agent",
      level: "info",
      category: "local_agent.master_agent_task_completed",
      message: `Master Codex Node 已完成主 Agent 任务 ${task.taskId}。`,
      detail: replyBody.slice(0, 280),
      mirrorToMaster: false,
    });
  } catch (error) {
    const detail = error instanceof Error ? error.message : String(error);
    runtime.activeMasterTask = {
      taskId: task.taskId,
      status: "failed",
      completedAt: new Date().toISOString(),
      detail,
    };
    await completeMasterAgentTask(config, runtime, {
      taskId: task.taskId,
      status: "failed",
      errorMessage: detail,
    }).catch(() => null);
    await postAppLog(config, {
      projectId: "master-agent",
      level: "error",
      category: "local_agent.master_agent_task_failed",
      message: `Master Codex Node 执行主 Agent 任务失败：${task.taskId}`,
      detail,
      mirrorToMaster: true,
    });
  } finally {
    await rm(outputFile, { force: true }).catch(() => null);
    runtime.masterTaskBusy = false;
  }
}

async function pollMasterAgentTasks(config, runtime) {
  if (config.masterAgentEnabled === false || runtime.masterTaskBusy) {
    return;
  }

  try {
    const claim = await claimMasterAgentTask(config, runtime);
    if (!claim.ok) {
      runtime.lastMasterTaskPoll = {
        at: new Date().toISOString(),
        ok: false,
        status: claim.status,
        body: claim.body,
      };
      return;
    }

    const parsed = JSON.parse(claim.body);
    runtime.lastMasterTaskPoll = {
      at: new Date().toISOString(),
      ok: true,
      status: claim.status,
      body: claim.body,
    };
    if (!parsed.task) {
      return;
    }

    runtime.masterTaskBusy = true;
    await runMasterAgentTask(config, runtime, parsed.task);
  } catch (error) {
    runtime.lastMasterTaskPoll = {
      at: new Date().toISOString(),
      ok: false,
      status: 0,
      body: error instanceof Error ? error.message : String(error),
    };
  }
}

const configPath = process.argv[2];
if (!configPath) {
  console.error("Usage: node local-agent/server.mjs <config.json>");
  process.exit(1);
}

const config = await loadConfig(configPath);

const runtime = {
  lastHeartbeatAt: null,
  lastHeartbeatOk: false,
  lastHeartbeatStatus: null,
  lastHeartbeatBody: null,
  lastSkillSyncAt: null,
  lastSkillSyncOk: false,
  lastSkillSyncStatus: null,
  lastSkillSyncBody: null,
  lastSkills: [],
  issuedToken: config.token ?? null,
  pairingCodeUsed: config.pairingCode ?? null,
  lastThreadContextResults: [],
  masterTaskBusy: false,
  activeMasterTask: null,
  lastMasterTaskPoll: null,
};

async function heartbeat() {
  try {
    const result = await postHeartbeat(config, runtime);
    runtime.lastHeartbeatAt = new Date().toISOString();
    runtime.lastHeartbeatOk = result.ok;
    runtime.lastHeartbeatStatus = result.status;
    runtime.lastHeartbeatBody = result.body;
    if (result.json?.token) {
      runtime.issuedToken = result.json.token;
    }
    if (!result.ok) {
      await postAppLog(config, {
        level: "error",
        category: "local_agent.heartbeat_failed",
        message: "local-agent 心跳返回失败。",
        detail: result.body,
        mirrorToMaster: true,
      });
    }

    const snapshots = Array.isArray(config.threadContexts) ? config.threadContexts : [];
    runtime.lastThreadContextResults = [];
    for (const snapshot of snapshots) {
      const threadResult = await postThreadContext(config, runtime, snapshot);
      runtime.lastThreadContextResults.push(threadResult);
      if (!threadResult.ok) {
        await postAppLog(config, {
          projectId: snapshot.projectId,
          level: "error",
          category: "local_agent.thread_context_failed",
          message: `线程预算上报失败：${snapshot.threadId}`,
          detail: threadResult.body,
          mirrorToMaster: true,
        });
      }
    }

    try {
      const skills = await discoverSkills(config);
      runtime.lastSkills = skills;
      const skillSyncResult = await postSkills(config, skills);
      runtime.lastSkillSyncAt = new Date().toISOString();
      runtime.lastSkillSyncOk = skillSyncResult.ok;
      runtime.lastSkillSyncStatus = skillSyncResult.status;
      runtime.lastSkillSyncBody = skillSyncResult.body;
    } catch (error) {
      runtime.lastSkillSyncAt = new Date().toISOString();
      runtime.lastSkillSyncOk = false;
      runtime.lastSkillSyncStatus = 0;
      runtime.lastSkillSyncBody = error instanceof Error ? error.message : String(error);
      await postAppLog(config, {
        level: "error",
        category: "local_agent.skills_sync_failed",
        message: "Skill 扫描或同步失败。",
        detail: runtime.lastSkillSyncBody,
        mirrorToMaster: true,
      });
    }
  } catch (error) {
    runtime.lastHeartbeatAt = new Date().toISOString();
    runtime.lastHeartbeatOk = false;
    runtime.lastHeartbeatStatus = 0;
    runtime.lastHeartbeatBody = error instanceof Error ? error.message : String(error);
    await postAppLog(config, {
      level: "error",
      category: "local_agent.heartbeat_exception",
      message: "local-agent 心跳执行异常。",
      detail: runtime.lastHeartbeatBody,
      mirrorToMaster: true,
    });
  }
}

await heartbeat();
await pollMasterAgentTasks(config, runtime);
setInterval(() => {
  void heartbeat();
}, config.heartbeatIntervalMs ?? 60000);
setInterval(() => {
  void pollMasterAgentTasks(config, runtime);
}, config.masterAgentPollIntervalMs ?? 3000);

const server = createServer(async (request, response) => {
  if (request.url === "/health") {
    response.writeHead(200, { "Content-Type": "application/json" });
    response.end(
      JSON.stringify({
          ok: true,
          service: "boss-local-agent",
          runtime,
        }),
      );
    return;
  }

  if (request.url === "/api/v1/device") {
    response.writeHead(200, { "Content-Type": "application/json" });
    response.end(JSON.stringify({ config, runtime }));
    return;
  }

  if (request.url === "/api/v1/skills") {
    response.writeHead(200, { "Content-Type": "application/json" });
    response.end(
      JSON.stringify({
        ok: true,
        deviceId: config.deviceId,
        skills: runtime.lastSkills,
        sync: {
          at: runtime.lastSkillSyncAt,
          ok: runtime.lastSkillSyncOk,
          status: runtime.lastSkillSyncStatus,
          body: runtime.lastSkillSyncBody,
        },
      }),
    );
    return;
  }

  if (request.url === "/api/v1/heartbeat" && request.method === "POST") {
    await heartbeat();
    response.writeHead(200, { "Content-Type": "application/json" });
    response.end(JSON.stringify({ ok: runtime.lastHeartbeatOk, runtime }));
    return;
  }

  response.writeHead(404, { "Content-Type": "application/json" });
  response.end(JSON.stringify({ ok: false, message: "not_found" }));
});

server.listen(config.port, config.bindHost, () => {
  console.log(
    JSON.stringify({
      ok: true,
      service: "boss-local-agent",
      bind: `${config.bindHost}:${config.port}`,
      controlPlaneUrl: config.controlPlaneUrl,
      workerId: config.workerId,
    }),
  );
});