import { Router, type Request, type Response } from "express";
import { eq } from "drizzle-orm";
import { z } from "zod";
import { db } from "../db/client.js";
import { integrations, integrationCredentials, integrationTypes } from "../db/schema.js";
import { requireAuth, requireRole } from "../auth/middleware.js";
import { recordAudit } from "../services/audit.js";
import { encryptSecret } from "../crypto.js";
import {
  INTEGRATION_FIELDS,
  resolveBaseUrl,
  splitIntegrationConfig,
  validateIntegrationConfig,
} from "../integrations/fieldSchemas.js";
import { createIntegrationAdapter } from "../integrations/registry.js";
import { loadIntegrationConfig } from "../integrations/loadIntegration.js";
import { createTailscaleAdapter } from "../integrations/tailscale/adapter.js";
import { createGiteaAdapter } from "../integrations/gitea/adapter.js";
import { createDockhandAdapter } from "../integrations/dockhand/adapter.js";
import { createSemaphoreAdapter } from "../integrations/semaphore/adapter.js";
import { createProxmoxAdapter } from "../integrations/proxmox/adapter.js";
import { createSynologyAdapter } from "../integrations/synology/adapter.js";
import { asyncHandler } from "../utils/asyncHandler.js";

export const integrationsRouter = Router();

integrationsRouter.use(requireAuth);

const IMPLEMENTED_TYPES = Object.keys(INTEGRATION_FIELDS) as (keyof typeof INTEGRATION_FIELDS)[];

integrationsRouter.get("/fields", (_req, res) => {
  res.json({ fields: INTEGRATION_FIELDS });
});

integrationsRouter.get("/", asyncHandler(async (_req, res) => {
  const rows = await db
    .select({
      id: integrations.id,
      type: integrations.type,
      name: integrations.name,
      baseUrl: integrations.baseUrl,
      enabled: integrations.enabled,
      createdAt: integrations.createdAt,
    })
    .from(integrations);
  res.json({ integrations: rows });
}));

const configValueSchema = z.union([z.string(), z.boolean()]);

const createIntegrationSchema = z.object({
  type: z.enum(integrationTypes),
  name: z.string().min(1).max(200),
  config: z.record(configValueSchema),
});

integrationsRouter.post("/", requireRole("admin"), asyncHandler(async (req, res) => {
  const parsed = createIntegrationSchema.safeParse(req.body);
  if (!parsed.success) {
    return res.status(400).json({ error: "invalid_body", details: parsed.error.flatten() });
  }
  const { type, name, config } = parsed.data;

  if (!IMPLEMENTED_TYPES.includes(type)) {
    return res.status(400).json({ error: "not_implemented", message: `Integration type "${type}" isn't available yet.` });
  }

  const missing = validateIntegrationConfig(type, config);
  if (missing.length > 0) {
    return res.status(400).json({ error: "missing_fields", fields: missing });
  }

  const { secretFields, nonSecretFields } = splitIntegrationConfig(type, config);

  let credentialId: number | null = null;
  if (Object.keys(secretFields).length > 0) {
    const [cred] = await db
      .insert(integrationCredentials)
      .values({ name: `${type}:${name}`, encryptedSecret: encryptSecret(JSON.stringify(secretFields)) })
      .returning();
    credentialId = cred.id;
  }

  const [created] = await db
    .insert(integrations)
    .values({
      type,
      name,
      baseUrl: resolveBaseUrl(type, nonSecretFields),
      credentialId,
      config: JSON.stringify(nonSecretFields),
      enabled: true,
    })
    .returning();

  await recordAudit({
    actor: req.currentUser!,
    category: "integration",
    action: "create",
    targetType: "integration",
    targetId: created.id,
    detail: { type, name },
  });

  res.status(201).json({
    integration: {
      id: created.id,
      type: created.type,
      name: created.name,
      baseUrl: created.baseUrl,
      enabled: created.enabled,
      createdAt: created.createdAt,
    },
  });
}));

const updateIntegrationSchema = z.object({
  name: z.string().min(1).max(200).optional(),
  enabled: z.boolean().optional(),
  config: z.record(configValueSchema).optional(),
});

integrationsRouter.patch("/:id", requireRole("admin"), asyncHandler(async (req, res) => {
  const id = Number(req.params.id);
  const parsed = updateIntegrationSchema.safeParse(req.body);
  if (!parsed.success) {
    return res.status(400).json({ error: "invalid_body", details: parsed.error.flatten() });
  }

  const [existing] = await db.select().from(integrations).where(eq(integrations.id, id)).limit(1);
  if (!existing) {
    return res.status(404).json({ error: "not_found" });
  }

  let credentialId = existing.credentialId;
  let configJson = existing.config;
  let baseUrl = existing.baseUrl;

  if (parsed.data.config) {
    const loaded = await loadIntegrationConfig(id);
    const { secretFields, nonSecretFields } = splitIntegrationConfig(existing.type, parsed.data.config);
    const mergedNonSecret = { ...(loaded?.config ?? {}), ...nonSecretFields };
    for (const field of INTEGRATION_FIELDS[existing.type] ?? []) {
      if (field.secret) delete (mergedNonSecret as Record<string, unknown>)[field.key];
    }
    configJson = JSON.stringify(mergedNonSecret);
    baseUrl = resolveBaseUrl(existing.type, mergedNonSecret);

    if (Object.keys(secretFields).length > 0) {
      const existingSecrets: Record<string, string | boolean> = {};
      const fields = (INTEGRATION_FIELDS[existing.type] ?? []).filter((f) => f.secret);
      for (const f of fields) {
        if (loaded?.config[f.key] !== undefined) existingSecrets[f.key] = loaded.config[f.key]!;
      }
      const mergedSecrets = { ...existingSecrets, ...secretFields };
      const encrypted = encryptSecret(JSON.stringify(mergedSecrets));
      if (existing.credentialId) {
        await db.update(integrationCredentials).set({ encryptedSecret: encrypted }).where(eq(integrationCredentials.id, existing.credentialId));
      } else {
        const [cred] = await db
          .insert(integrationCredentials)
          .values({ name: `${existing.type}:${existing.name}`, encryptedSecret: encrypted })
          .returning();
        credentialId = cred.id;
      }
    }
  }

  const [updated] = await db
    .update(integrations)
    .set({
      name: parsed.data.name ?? existing.name,
      enabled: parsed.data.enabled ?? existing.enabled,
      credentialId,
      config: configJson,
      baseUrl,
    })
    .where(eq(integrations.id, id))
    .returning();

  await recordAudit({
    actor: req.currentUser!,
    category: "integration",
    action: "update",
    targetType: "integration",
    targetId: id,
    detail: { name: updated.name },
  });

  res.json({
    integration: {
      id: updated.id,
      type: updated.type,
      name: updated.name,
      baseUrl: updated.baseUrl,
      enabled: updated.enabled,
      createdAt: updated.createdAt,
    },
  });
}));

integrationsRouter.get("/:id/config", requireRole("admin"), asyncHandler(async (req, res) => {
  const id = Number(req.params.id);
  const loaded = await loadIntegrationConfig(id);
  if (!loaded) {
    return res.status(404).json({ error: "not_found" });
  }

  // Never return secret fields (API tokens/passwords) to the browser — the edit
  // form pre-fills only non-secret fields and leaves secret inputs blank.
  const nonSecretConfig: Record<string, string | boolean | undefined> = { ...loaded.config };
  for (const field of INTEGRATION_FIELDS[loaded.integration.type] ?? []) {
    if (field.secret) delete nonSecretConfig[field.key];
  }

  res.json({
    integration: {
      id: loaded.integration.id,
      type: loaded.integration.type,
      name: loaded.integration.name,
      enabled: loaded.integration.enabled,
    },
    config: nonSecretConfig,
  });
}));

const testExistingIntegrationSchema = z.object({ config: z.record(configValueSchema).optional() });

integrationsRouter.post("/:id/test", requireRole("admin"), asyncHandler(async (req, res) => {
  const id = Number(req.params.id);
  const parsed = testExistingIntegrationSchema.safeParse(req.body);
  if (!parsed.success) {
    return res.status(400).json({ error: "invalid_body", details: parsed.error.flatten() });
  }

  const loaded = await loadIntegrationConfig(id);
  if (!loaded) {
    return res.status(404).json({ error: "not_found" });
  }

  // Merge any freshly-typed fields (e.g. a replacement token) over the
  // already-stored, decrypted config — lets "Test connection" work during an
  // edit without ever sending the current secret value back to the browser.
  const mergedConfig = { ...loaded.config, ...(parsed.data.config ?? {}) };
  const adapter = createIntegrationAdapter(loaded.integration.type, mergedConfig);
  const result = await adapter.ping();
  res.json(result);
}));

integrationsRouter.delete("/:id", requireRole("admin"), asyncHandler(async (req, res) => {
  const id = Number(req.params.id);
  const [existing] = await db.select().from(integrations).where(eq(integrations.id, id)).limit(1);
  if (!existing) {
    return res.status(404).json({ error: "not_found" });
  }

  await db.delete(integrations).where(eq(integrations.id, id));
  if (existing.credentialId) {
    await db.delete(integrationCredentials).where(eq(integrationCredentials.id, existing.credentialId));
  }

  await recordAudit({
    actor: req.currentUser!,
    category: "integration",
    action: "delete",
    targetType: "integration",
    targetId: id,
    detail: { name: existing.name },
  });

  res.status(204).end();
}));

const testIntegrationSchema = z.object({
  type: z.enum(integrationTypes),
  config: z.record(configValueSchema),
});

integrationsRouter.post("/test", requireRole("admin"), asyncHandler(async (req, res) => {
  const parsed = testIntegrationSchema.safeParse(req.body);
  if (!parsed.success) {
    return res.status(400).json({ error: "invalid_body", details: parsed.error.flatten() });
  }
  if (!IMPLEMENTED_TYPES.includes(parsed.data.type)) {
    return res.status(400).json({ error: "not_implemented" });
  }
  const adapter = createIntegrationAdapter(parsed.data.type, parsed.data.config);
  const result = await adapter.ping();
  res.json(result);
}));

// ─── Tailscale ───────────────────────────────────────────────────────────────

/**
 * Loads the integration row and checks its type BEFORE constructing an
 * adapter — createIntegrationAdapter() throws for any not-yet-implemented
 * type, and that must never happen for an existing non-tailscale row (e.g. a
 * Proxmox row someone points at these Tailscale-only routes).
 */
async function requireTailscaleAdapter(req: Request, res: Response) {
  const id = Number(req.params.id);
  const loaded = await loadIntegrationConfig(id);
  if (!loaded) {
    res.status(404).json({ error: "not_found" });
    return null;
  }
  if (loaded.integration.type !== "tailscale") {
    res.status(400).json({ error: "wrong_type" });
    return null;
  }
  if (!loaded.integration.enabled) {
    res.status(400).json({ error: "integration_disabled" });
    return null;
  }
  return { integration: loaded.integration, adapter: createTailscaleAdapter(loaded.config as any) };
}

integrationsRouter.get("/:id/tailscale/devices", asyncHandler(async (req, res) => {
  const found = await requireTailscaleAdapter(req, res);
  if (!found) return;

  try {
    const devices = await found.adapter.listDevices();
    res.json({
      devices,
      summary: {
        total: devices.length,
        online: devices.filter((d) => d.online).length,
        unauthorized: devices.filter((d) => !d.authorized).length,
      },
    });
  } catch (err) {
    res.status(502).json({ error: err instanceof Error ? err.message : String(err) });
  }
}));

const authorizeSchema = z.object({ authorized: z.boolean() });

integrationsRouter.post(
  "/:id/tailscale/devices/:deviceId/authorize",
  requireRole("operator"),
  asyncHandler(async (req, res) => {
    const found = await requireTailscaleAdapter(req, res);
    if (!found) return;

    const parsed = authorizeSchema.safeParse(req.body);
    if (!parsed.success) {
      return res.status(400).json({ error: "invalid_body", details: parsed.error.flatten() });
    }

    try {
      await found.adapter.setAuthorized(req.params.deviceId, parsed.data.authorized);
      await recordAudit({
        actor: req.currentUser!,
        category: "integration",
        action: parsed.data.authorized ? "authorize_device" : "deauthorize_device",
        targetType: "tailscale_device",
        targetId: req.params.deviceId,
        detail: { integrationId: found.integration.id },
      });
      res.status(204).end();
    } catch (err) {
      res.status(502).json({ error: err instanceof Error ? err.message : String(err) });
    }
  }),
);

integrationsRouter.delete(
  "/:id/tailscale/devices/:deviceId",
  requireRole("operator"),
  asyncHandler(async (req, res) => {
    const found = await requireTailscaleAdapter(req, res);
    if (!found) return;

    try {
      await found.adapter.deleteDevice(req.params.deviceId);
      await recordAudit({
        actor: req.currentUser!,
        category: "integration",
        action: "remove_device",
        targetType: "tailscale_device",
        targetId: req.params.deviceId,
        detail: { integrationId: found.integration.id },
      });
      res.status(204).end();
    } catch (err) {
      res.status(502).json({ error: err instanceof Error ? err.message : String(err) });
    }
  }),
);

// ─── Gitea ───────────────────────────────────────────────────────────────────

async function requireGiteaAdapter(req: Request, res: Response) {
  const id = Number(req.params.id);
  const loaded = await loadIntegrationConfig(id);
  if (!loaded) {
    res.status(404).json({ error: "not_found" });
    return null;
  }
  if (loaded.integration.type !== "gitea") {
    res.status(400).json({ error: "wrong_type" });
    return null;
  }
  if (!loaded.integration.enabled) {
    res.status(400).json({ error: "integration_disabled" });
    return null;
  }
  return { integration: loaded.integration, adapter: createGiteaAdapter(loaded.config as any) };
}

integrationsRouter.get("/:id/gitea/repos", asyncHandler(async (req, res) => {
  const found = await requireGiteaAdapter(req, res);
  if (!found) return;

  try {
    const repos = await found.adapter.listReposWithStatus();
    res.json({ repos });
  } catch (err) {
    res.status(502).json({ error: err instanceof Error ? err.message : String(err) });
  }
}));

integrationsRouter.post(
  "/:id/gitea/repos/:owner/:repo/runs/:runId/rerun-failed",
  requireRole("operator"),
  asyncHandler(async (req, res) => {
    const found = await requireGiteaAdapter(req, res);
    if (!found) return;

    const runId = Number(req.params.runId);
    if (!Number.isInteger(runId)) {
      return res.status(400).json({ error: "invalid_run_id" });
    }

    try {
      await found.adapter.rerunFailedJobs(req.params.owner, req.params.repo, runId);
      await recordAudit({
        actor: req.currentUser!,
        category: "integration",
        action: "rerun_failed_jobs",
        targetType: "gitea_workflow_run",
        targetId: `${req.params.owner}/${req.params.repo}#${runId}`,
        detail: { integrationId: found.integration.id },
      });
      res.status(204).end();
    } catch (err) {
      res.status(502).json({ error: err instanceof Error ? err.message : String(err) });
    }
  }),
);

// ─── Dockhand ────────────────────────────────────────────────────────────────

async function requireDockhandAdapter(req: Request, res: Response) {
  const id = Number(req.params.id);
  const loaded = await loadIntegrationConfig(id);
  if (!loaded) {
    res.status(404).json({ error: "not_found" });
    return null;
  }
  if (loaded.integration.type !== "dockhand") {
    res.status(400).json({ error: "wrong_type" });
    return null;
  }
  if (!loaded.integration.enabled) {
    res.status(400).json({ error: "integration_disabled" });
    return null;
  }
  return { integration: loaded.integration, adapter: createDockhandAdapter(loaded.config as any) };
}

integrationsRouter.get("/:id/dockhand/containers", asyncHandler(async (req, res) => {
  const found = await requireDockhandAdapter(req, res);
  if (!found) return;

  try {
    const containers = await found.adapter.listContainers();
    res.json({
      containers,
      summary: {
        total: containers.length,
        running: containers.filter((c) => c.state === "running").length,
      },
    });
  } catch (err) {
    res.status(502).json({ error: err instanceof Error ? err.message : String(err) });
  }
}));

const dockhandActions = ["start", "stop", "restart"] as const;

for (const action of dockhandActions) {
  integrationsRouter.post(
    `/:id/dockhand/environments/:envId/containers/:containerId/${action}`,
    requireRole("operator"),
    asyncHandler(async (req, res) => {
      const found = await requireDockhandAdapter(req, res);
      if (!found) return;

      const envId = Number(req.params.envId);
      if (!Number.isInteger(envId)) {
        return res.status(400).json({ error: "invalid_environment_id" });
      }

      try {
        await found.adapter[`${action}Container`](envId, req.params.containerId);
        await recordAudit({
          actor: req.currentUser!,
          category: "integration",
          action: `${action}_container`,
          targetType: "dockhand_container",
          targetId: req.params.containerId,
          detail: { integrationId: found.integration.id, environmentId: envId },
        });
        res.status(204).end();
      } catch (err) {
        res.status(502).json({ error: err instanceof Error ? err.message : String(err) });
      }
    }),
  );
}

// ─── Semaphore ───────────────────────────────────────────────────────────────

async function requireSemaphoreAdapter(req: Request, res: Response) {
  const id = Number(req.params.id);
  const loaded = await loadIntegrationConfig(id);
  if (!loaded) {
    res.status(404).json({ error: "not_found" });
    return null;
  }
  if (loaded.integration.type !== "semaphore") {
    res.status(400).json({ error: "wrong_type" });
    return null;
  }
  if (!loaded.integration.enabled) {
    res.status(400).json({ error: "integration_disabled" });
    return null;
  }
  return { integration: loaded.integration, adapter: createSemaphoreAdapter(loaded.config as any) };
}

integrationsRouter.get("/:id/semaphore/templates", asyncHandler(async (req, res) => {
  const found = await requireSemaphoreAdapter(req, res);
  if (!found) return;

  try {
    const templates = await found.adapter.listTemplatesWithStatus();
    res.json({
      templates,
      summary: {
        total: templates.length,
        failing: templates.filter((t) => t.lastTask?.status === "error").length,
      },
    });
  } catch (err) {
    res.status(502).json({ error: err instanceof Error ? err.message : String(err) });
  }
}));

integrationsRouter.post(
  "/:id/semaphore/projects/:projectId/templates/:templateId/run",
  requireRole("operator"),
  asyncHandler(async (req, res) => {
    const found = await requireSemaphoreAdapter(req, res);
    if (!found) return;

    const projectId = Number(req.params.projectId);
    const templateId = Number(req.params.templateId);
    if (!Number.isInteger(projectId) || !Number.isInteger(templateId)) {
      return res.status(400).json({ error: "invalid_id" });
    }

    try {
      const task = await found.adapter.runTemplate(projectId, templateId);
      await recordAudit({
        actor: req.currentUser!,
        category: "integration",
        action: "run_template",
        targetType: "semaphore_template",
        targetId: templateId,
        detail: { integrationId: found.integration.id, projectId, taskId: task.id },
      });
      res.status(201).json({ task });
    } catch (err) {
      res.status(502).json({ error: err instanceof Error ? err.message : String(err) });
    }
  }),
);

// ─── Proxmox ─────────────────────────────────────────────────────────────────

async function requireProxmoxAdapter(req: Request, res: Response) {
  const id = Number(req.params.id);
  const loaded = await loadIntegrationConfig(id);
  if (!loaded) {
    res.status(404).json({ error: "not_found" });
    return null;
  }
  if (loaded.integration.type !== "proxmox") {
    res.status(400).json({ error: "wrong_type" });
    return null;
  }
  if (!loaded.integration.enabled) {
    res.status(400).json({ error: "integration_disabled" });
    return null;
  }
  return { integration: loaded.integration, adapter: createProxmoxAdapter(loaded.config as any) };
}

integrationsRouter.get("/:id/proxmox/guests", asyncHandler(async (req, res) => {
  const found = await requireProxmoxAdapter(req, res);
  if (!found) return;

  try {
    const guests = await found.adapter.listGuests();
    res.json({
      guests,
      summary: {
        total: guests.length,
        running: guests.filter((g) => g.status === "running").length,
      },
    });
  } catch (err) {
    res.status(502).json({ error: err instanceof Error ? err.message : String(err) });
  }
}));

const proxmoxActions = ["start", "stop", "restart", "shutdown"] as const;

for (const action of proxmoxActions) {
  integrationsRouter.post(
    `/:id/proxmox/nodes/:node/:type/:vmid/${action}`,
    requireRole("operator"),
    asyncHandler(async (req, res) => {
      const found = await requireProxmoxAdapter(req, res);
      if (!found) return;

      const vmid = Number(req.params.vmid);
      if (!Number.isInteger(vmid)) {
        return res.status(400).json({ error: "invalid_vmid" });
      }
      const type = req.params.type;
      if (type !== "qemu" && type !== "lxc") {
        return res.status(400).json({ error: "invalid_type" });
      }

      try {
        await found.adapter[`${action}Guest`](req.params.node, type, vmid);
        await recordAudit({
          actor: req.currentUser!,
          category: "integration",
          action: `${action}_guest`,
          targetType: "proxmox_guest",
          targetId: vmid,
          detail: { integrationId: found.integration.id, node: req.params.node, guestType: type },
        });
        res.status(204).end();
      } catch (err) {
        res.status(502).json({ error: err instanceof Error ? err.message : String(err) });
      }
    }),
  );
}

// ─── Synology ────────────────────────────────────────────────────────────────
// Read-only per the delivery plan — no start/stop/etc actions.

async function requireSynologyAdapter(req: Request, res: Response) {
  const id = Number(req.params.id);
  const loaded = await loadIntegrationConfig(id);
  if (!loaded) {
    res.status(404).json({ error: "not_found" });
    return null;
  }
  if (loaded.integration.type !== "synology") {
    res.status(400).json({ error: "wrong_type" });
    return null;
  }
  if (!loaded.integration.enabled) {
    res.status(400).json({ error: "integration_disabled" });
    return null;
  }
  return { integration: loaded.integration, adapter: createSynologyAdapter(loaded.config as any) };
}

integrationsRouter.get("/:id/synology/storage", asyncHandler(async (req, res) => {
  const found = await requireSynologyAdapter(req, res);
  if (!found) return;

  try {
    const info = await found.adapter.getStorageInfo();
    res.json({
      ...info,
      summary: {
        volumeCount: info.volumes.length,
        volumesNotNormal: info.volumes.filter((v) => v.status !== "normal").length,
        diskCount: info.disks.length,
        disksNotNormal: info.disks.filter((d) => d.status !== "normal").length,
      },
    });
  } catch (err) {
    res.status(502).json({ error: err instanceof Error ? err.message : String(err) });
  }
}));