import { createServer } from "node:http";

const PORT = Number(process.env.MOCK_PORT ?? 8765);

const now = new Date().toISOString();

const fixtures = {
  "/api/v1/health": { status: "ok" },
  "/api/v1/agents": {
    items: [
      {
        agent_id: "agent-1",
        hostname: "host-1",
        status: "alive",
        last_seen_at: now,
        features: { push: true, metrics: false },
        labels: { env: "dev", monlet_agent_version: "0.1.0" },
      },
      {
        agent_id: "agent-2",
        hostname: "host-2",
        status: "dead",
        last_seen_at: now,
        features: { push: true, metrics: false },
        labels: {},
      },
    ],
    next_cursor: null,
  },
  "/api/v1/agents/agent-1": {
    agent_id: "agent-1",
    hostname: "host-1",
    status: "alive",
    last_seen_at: now,
    features: { push: true, metrics: false },
    labels: { env: "dev", monlet_agent_version: "0.1.0" },
  },
  "/api/v1/checks": {
    items: [
      {
        agent_id: "agent-1",
        check_id: "disk",
        status: "ok",
        exit_code: 0,
        last_observed_at: now,
        incident_key: "agent-1:disk",
        summary: "disk ok",
      },
      {
        agent_id: "agent-1",
        check_id: "load",
        status: "warning",
        exit_code: 1,
        last_observed_at: now,
        incident_key: "agent-1:load",
        summary: "load high",
      },
      {
        agent_id: "agent-1",
        check_id: "agent_liveness",
        status: "ok",
        exit_code: 0,
        last_observed_at: now,
        incident_key: "agent:agent-1:liveness",
        summary: "agent is alive",
      },
      {
        agent_id: "agent-2",
        check_id: "agent_liveness",
        status: "critical",
        exit_code: 2,
        last_observed_at: now,
        incident_key: "agent:agent-2:liveness",
        summary: "agent is dead",
      },
    ],
    next_cursor: null,
  },
  "/api/v1/incidents": {
    items: [
      {
        id: "00000000-0000-0000-0000-000000000001",
        incident_key: "agent-1:load",
        state: "open",
        severity: "warning",
        agent_id: "agent-1",
        check_id: "load",
        opened_at: now,
        summary: "load high",
      },
      {
        id: "00000000-0000-0000-0000-000000000003",
        incident_key: "agent:agent-2:liveness",
        state: "open",
        severity: "critical",
        agent_id: "agent-2",
        check_id: "agent_liveness",
        opened_at: now,
        summary: "agent is dead",
      },
      {
        id: "00000000-0000-0000-0000-000000000004",
        incident_key: "agent-2:disk",
        state: "resolved",
        severity: "critical",
        agent_id: "agent-2",
        check_id: "disk",
        opened_at: now,
        resolved_at: now,
        summary: "disk recovered",
      },
    ],
    next_cursor: null,
  },
  "/api/v1/events/query": {
    items: [
      {
        event_id: "00000000-0000-7000-8000-000000000001",
        agent_id: "agent-1",
        check_id: "disk",
        observed_at: now,
        received_at: now,
        status: "ok",
        exit_code: 0,
        duration_ms: 12,
        output: "disk ok",
        output_truncated: false,
        notifications_enabled: true,
      },
      {
        event_id: "00000000-0000-7000-8000-000000000002",
        agent_id: "agent-1",
        check_id: "load",
        observed_at: now,
        received_at: now,
        status: "warning",
        exit_code: 1,
        duration_ms: 34,
        output: "load high",
        output_truncated: false,
        notifications_enabled: true,
      },
      {
        event_id: "00000000-0000-7000-8000-000000000003",
        agent_id: "agent-2",
        check_id: "agent_liveness",
        observed_at: now,
        received_at: now,
        status: "critical",
        exit_code: 2,
        duration_ms: 0,
        output: "agent is dead",
        output_truncated: false,
        notifications_enabled: true,
      },
    ],
    next_cursor: null,
  },
  "/api/v1/notifiers/outbox": {
    items: [
      {
        id: "00000000-0000-0000-0000-000000000002",
        notifier: "debug",
        state: "sent",
        incident_id: "00000000-0000-0000-0000-000000000001",
        event_type: "firing",
        attempts: 1,
        next_attempt_at: null,
        last_error: null,
        updated_at: now,
      },
    ],
    next_cursor: null,
  },
};

const server = createServer((req, res) => {
  const url = new URL(req.url ?? "/", `http://x`);
  let body = fixtures[url.pathname];
  if (url.pathname === "/api/v1/checks" && body) {
    const agentId = url.searchParams.get("agent_id");
    if (agentId) {
      body = {
        ...body,
        items: body.items.filter((item) => item.agent_id === agentId),
        next_cursor: null,
      };
    }
  }
  if (url.pathname === "/api/v1/events/query" && body) {
    const agentId = url.searchParams.get("agent_id");
    const checkId = url.searchParams.get("check_id");
    body = {
      ...body,
      items: body.items.filter((item) => {
        if (agentId && item.agent_id !== agentId) return false;
        if (checkId && item.check_id !== checkId) return false;
        return true;
      }),
      next_cursor: null,
    };
  }
  if (url.pathname === "/api/v1/incidents" && body) {
    const state = url.searchParams.get("state");
    if (state) {
      body = {
        ...body,
        items: body.items.filter((item) => item.state === state),
        next_cursor: null,
      };
    }
  }
  res.setHeader("Content-Type", "application/json");
  if (!body) {
    res.statusCode = 404;
    res.end(
      JSON.stringify({ error: { code: "not_found", message: "not in fixtures", request_id: "mock" } }),
    );
    return;
  }
  res.end(JSON.stringify(body));
});

server.listen(PORT, "127.0.0.1", () => {
  console.log(`mock server on ${PORT}`);
});