import {
  createConnection,
  deleteConnection,
  devicePoll,
  deviceStart,
  getConnection,
  listConnections,
  listRuns,
  updateConnection,
} from "@sttracker/core/connections";
import { ValidationError } from "@sttracker/core/errors";
import { enqueue } from "@sttracker/core/jobs";
import type { PluginRegistry } from "@sttracker/core/registry";
import { z } from "zod";
import { HttpError, json, noContent, route } from "../http.ts";
import { formFile } from "./form.ts";
import { qInt } from "./schemas.ts";

const ALREADY_RUNNING = "A sync for this source is already queued or running.";

function pluginOf(registry: PluginRegistry, pluginId: string) {
  const plugin = registry.get(pluginId);
  if (!plugin) throw new ValidationError("pluginId", "not_installed");
  return plugin;
}

async function enqueueSync(db: Parameters<typeof enqueue>[0], connectionId: string, payload: Record<string, unknown>): Promise<Response> {
  const jobId = await enqueue(db, "sync", { connectionId, ...payload }, { lockKey: `sync:${connectionId}` });
  if (jobId === null) throw new HttpError(409, "conflict", ALREADY_RUNNING);
  return json({ jobId }, 202);
}

const schedule = z.number().int().min(1).nullable();
const config = z.record(z.string(), z.unknown());
const creds = z.record(z.string(), z.string());

export const sourceRoutes = [
  route({
    method: "GET",
    path: "plugins",
    summary: "Installed source plugins (manifests, plus deviceAuth: whether sign-in uses a device code).",
    auth: "any:read",
    handler: async ({ deps }) => deps.registry.list().map((m) => ({ ...m, deviceAuth: !!deps.registry.get(m.id)?.deviceAuth })),
  }),
  route({
    method: "GET",
    path: "sources",
    summary: "Your source connections (never includes secrets).",
    auth: "any:read",
    handler: async ({ deps, user }) => listConnections(deps.db, user.id),
  }),
  route({
    method: "POST",
    path: "sources",
    summary: "Connect a source. Config fields typed secret are stored encrypted.",
    auth: "session",
    body: z
      .object({ pluginId: z.string().min(1), name: z.string().min(1).max(200), config: config.optional(), credentials: creds.optional(), scheduleMinutes: schedule.optional() })
      .strict(),
    handler: async ({ deps, user, body }) => {
      const plugin = pluginOf(deps.registry, body.pluginId);
      const id = await createConnection(deps.db, deps.secret, user.id, { ...body, config: body.config ?? {} }, plugin.manifest);
      return json(await getConnection(deps.db, user.id, id), 201);
    },
  }),
  route({
    method: "PATCH",
    path: "sources/:id",
    summary: "Edit a source connection. Omitted secrets are kept.",
    auth: "session",
    body: z
      .object({ name: z.string().min(1).max(200), config, credentials: creds, scheduleMinutes: schedule, status: z.enum(["active", "paused"]) })
      .partial()
      .strict(),
    handler: async ({ deps, user, params, body }) => {
      const conn = await getConnection(deps.db, user.id, params.id!);
      await updateConnection(deps.db, deps.secret, user.id, conn.id, body, pluginOf(deps.registry, conn.pluginId).manifest);
      return getConnection(deps.db, user.id, conn.id);
    },
  }),
  route({
    method: "DELETE",
    path: "sources/:id",
    summary: "Disconnect a source: pauses it and wipes its credentials. Imported data stays.",
    auth: "session",
    handler: async ({ deps, user, params }) => {
      await getConnection(deps.db, user.id, params.id!);
      await deleteConnection(deps.db, user.id, params.id!);
      return noContent();
    },
  }),
  route({
    method: "POST",
    path: "sources/:id/run",
    summary: "Queue a sync now. 409 if one is already queued or running.",
    auth: "any:write",
    body: z.object({ mode: z.enum(["full", "changes"]).optional() }).strict().optional(),
    handler: async ({ deps, user, params, body }) => {
      const conn = await getConnection(deps.db, user.id, params.id!);
      return enqueueSync(deps.db, conn.id, body?.mode ? { mode: body.mode } : {});
    },
  }),
  route({
    method: "POST",
    path: "sources/:id/import",
    summary: "Upload an export file (multipart: file) and queue a file-mode sync.",
    auth: "any:write",
    multipart: true,
    handler: async ({ deps, user, params, form }) => {
      const conn = await getConnection(deps.db, user.id, params.id!);
      if (!pluginOf(deps.registry, conn.pluginId).importFile) throw new ValidationError("pluginId", "cannot_import_files");
      const file = formFile(form);
      const base64 = Buffer.from(await file.arrayBuffer()).toString("base64");
      return enqueueSync(deps.db, conn.id, { file: { name: file.name, base64 } });
    },
  }),
  route({
    method: "POST",
    path: "sources/:id/device/start",
    summary: "Start a device-code sign-in with the source.",
    auth: "session",
    handler: async ({ deps, user, params }) => deviceStart(deps.db, deps.secret, deps.registry, user.id, params.id!),
  }),
  route({
    method: "POST",
    path: "sources/:id/device/poll",
    summary: "Poll a device-code sign-in: pending or connected.",
    auth: "session",
    body: z.object({ deviceCode: z.string().min(1).max(2000) }).strict(),
    handler: async ({ deps, user, params, body }) => ({
      status: await devicePoll(deps.db, deps.secret, deps.registry, user.id, params.id!, body.deviceCode),
    }),
  }),
  route({
    method: "GET",
    path: "sources/:id/runs",
    summary: "Recent sync runs of a source, newest first.",
    auth: "any:read",
    query: z.object({ limit: qInt.optional() }),
    handler: async ({ deps, user, params, query }) => listRuns(deps.db, user.id, params.id!, query.limit),
  }),
];