import "dotenv/config";
import express from "express";
import cors from "cors";
import { validateEnv } from "./config/env";
import { 
  apiLimiter, 
  securityHeaders, 
  requestSizeLimits, 
  requestId,
  apiKeyAuth,
  auditLog,
} from "./middleware";
import { requestTimeout } from "./middleware/timeout";
import { logger } from "./logging/logger";
import { getMetrics, httpRequestDuration, httpRequestTotal, register } from "./metrics/prometheus";
import { healthCheck, readinessCheck, livenessCheck } from "./health/health";
import { listPlansEndpoint, createPlan, getPlan, addSignature, validatePlanEndpoint } from "./api/plans";
import { streamPlanStatus } from "./api/sse";
import { executionCoordinator } from "./services/execution";
import { runMigration } from "./db/migrations";

// Validate environment on startup
validateEnv();

const app = express();
const PORT = process.env.PORT || 8080;

// Middleware
app.use(cors());
app.use(securityHeaders);
app.use(requestSizeLimits);
app.use(requestId);
app.use(requestTimeout(30000)); // 30 second timeout
app.use(express.json({ limit: "10mb" }));
app.use(express.urlencoded({ extended: true, limit: "10mb" }));

// Request logging middleware
app.use((req, res, next) => {
  const start = Date.now();
  const requestId = req.headers["x-request-id"] as string || "unknown";

  res.on("finish", () => {
    const duration = Date.now() - start;
    httpRequestDuration.observe(
      { method: req.method, route: req.route?.path || req.path, status: res.statusCode },
      duration / 1000
    );
    httpRequestTotal.inc({ method: req.method, route: req.route?.path || req.path, status: res.statusCode });

    logger.info({
      req,
      res,
      duration,
      requestId,
    }, `${req.method} ${req.path} ${res.statusCode}`);
  });

  next();
});

// Health check endpoints (no auth required)
app.get("/health", async (req, res) => {
  const health = await healthCheck();
  res.status(health.status === "healthy" ? 200 : 503).json(health);
});

app.get("/ready", async (req, res) => {
  const ready = await readinessCheck();
  res.status(ready ? 200 : 503).json({ ready });
});

app.get("/live", async (req, res) => {
  const alive = await livenessCheck();
  res.status(alive ? 200 : 503).json({ alive });
});

// Metrics endpoint
app.get("/metrics", async (req, res) => {
  res.setHeader("Content-Type", register.contentType);
  const metrics = await getMetrics();
  res.send(metrics);
});

// API routes with rate limiting
app.use("/api", apiLimiter);

// Plan management endpoints
app.get("/api/plans", listPlansEndpoint);
app.post("/api/plans", auditLog("CREATE_PLAN", "plan"), createPlan);
app.get("/api/plans/:planId", getPlan);
app.post("/api/plans/:planId/signature", addSignature);
app.post("/api/plans/:planId/validate", validatePlanEndpoint);

// Execution endpoints
import { executePlan, getExecutionStatus, abortExecution } from "./api/execution";
import { registerWebhook } from "./api/webhooks";
app.post("/api/plans/:planId/execute", auditLog("EXECUTE_PLAN", "plan"), executePlan);
app.get("/api/plans/:planId/status", getExecutionStatus);
app.post("/api/plans/:planId/abort", auditLog("ABORT_PLAN", "plan"), abortExecution);
app.post("/api/webhooks", registerWebhook);

// Proxmox BFF — forwards browser requests to the CF-Access protected
// Proxmox API using a server-side service token. See
// orchestrator/src/integrations/proxmox.ts for required env.
import { proxmoxHealth, proxmoxClusterStatus } from "./api/proxmox";
app.get("/api/proxmox/health", proxmoxHealth);
app.get("/api/proxmox/cluster/status", proxmoxClusterStatus);

app.get("/api/plans/:planId/status/stream", streamPlanStatus);

// Error handling middleware
import { errorHandler } from "./services/errorHandler";
import { initRedis } from "./services/redis";

// Initialize Redis if configured
if (process.env.REDIS_URL) {
  initRedis();
}

app.use(errorHandler);

// Graceful shutdown
process.on("SIGTERM", async () => {
  logger.info("SIGTERM received, shutting down gracefully");
  // Close database connections
  // Close SSE connections
  process.exit(0);
});

process.on("SIGINT", async () => {
  logger.info("SIGINT received, shutting down gracefully");
  process.exit(0);
});

// Start server
async function start() {
  try {
    // Run database migrations
    if (process.env.RUN_MIGRATIONS === "true") {
      await runMigration();
    }

    app.listen(PORT, () => {
      logger.info({ port: PORT }, "Orchestrator service started");
    });
  } catch (error) {
    logger.error({ error }, "Failed to start server");
    process.exit(1);
  }
}

start();