import { getAdminToken, isAdminRequest } from "@tline/config";
import { getDb } from "@tline/db";

import { z } from "zod";
import type { ReadableStream as NodeReadableStream } from "node:stream/web";

const ADMIN_HEADER = "X-Porthole-Admin-Token";

const createImportBodySchema = z
  .object({
    type: z.enum(["upload", "minio_scan"]).default("upload"),
  })
  .strict();

const uploadParamsSchema = z.object({ id: z.string().uuid() });

const scanParamsSchema = z.object({ id: z.string().uuid() });
const scanBodySchema = z
  .object({
    bucket: z.string().min(1).optional(),
    prefix: z.string().min(1).default("originals/"),
  })
  .strict();

const contentTypeMediaMap: Array<{
  match: (ct: string) => boolean;
  mediaType: "image" | "video";
}> = [
  { match: (ct) => ct.startsWith("image/"), mediaType: "image" },
  { match: (ct) => ct.startsWith("video/"), mediaType: "video" },
];

function inferMediaTypeFromContentType(ct: string): "image" | "video" | null {
  const found = contentTypeMediaMap.find((m) => m.match(ct));
  return found?.mediaType ?? null;
}

function inferExtFromContentType(ct: string): string {
  const parts = ct.split("/");
  const ext = parts[1] ?? "bin";
  return ext.replace(/[^a-zA-Z0-9]+/g, "").toLowerCase() || "bin";
}

export function getAdminOk(headers: Headers) {
  const headerToken = headers.get(ADMIN_HEADER);
  return isAdminRequest({ adminToken: getAdminToken() }, { headerToken });
}

export async function handleCreateImport(input: {
  adminOk: boolean;
  body: unknown;
}): Promise<{ status: number; body: unknown }> {
  if (!input.adminOk) {
    return { status: 401, body: { error: "admin_required" } };
  }

  const body = createImportBodySchema.parse(input.body ?? {});
  const db = getDb();
  const rows = await db<
    {
      id: string;
      type: "upload" | "minio_scan";
      status: string;
      created_at: string;
    }[]
  >`
    insert into imports (type, status)
    values (${body.type}, 'new')
    returning id, type, status, created_at
  `;

  const created = rows[0];
  if (!created) {
    return { status: 500, body: { error: "insert_failed" } };
  }

  return { status: 200, body: created };
}

export async function handleUploadImport(input: {
  adminOk: boolean;
  params: { id: string };
  request: Request;
}): Promise<{ status: number; body: unknown }> {
  if (!input.adminOk) {
    return { status: 401, body: { error: "admin_required" } };
  }

  const paramsParsed = uploadParamsSchema.safeParse(input.params);
  if (!paramsParsed.success) {
    return {
      status: 400,
      body: { error: "invalid_params", issues: paramsParsed.error.issues },
    };
  }
  const params = paramsParsed.data;

  const { randomUUID } = await import("crypto");
  const { Readable } = await import("stream");
  const { PutObjectCommand } = await import("@aws-sdk/client-s3");
  const { getMinioBucket, getMinioInternalClient } = await import("@tline/minio");
  const { enqueueProcessAsset } = await import("@tline/queue");

  const contentType = input.request.headers.get("content-type") ?? "application/octet-stream";
  const mediaType = inferMediaTypeFromContentType(contentType);
  if (!mediaType) {
    return { status: 400, body: { error: "unsupported_content_type", contentType } };
  }

  const bucket = getMinioBucket();
  const ext = inferExtFromContentType(contentType);
  const objectId = randomUUID();
  const key = `staging/${params.id}/${objectId}.${ext}`;

  const db = getDb();
  const [imp] = await db<{ id: string }[]>`
    select id
    from imports
    where id = ${params.id}
    limit 1
  `;

  if (!imp) {
    return { status: 404, body: { error: "import_not_found" } };
  }

  if (!input.request.body) {
    return { status: 400, body: { error: "missing_body" } };
  }

  const s3 = getMinioInternalClient();
  const bodyStream = Readable.fromWeb(input.request.body as unknown as NodeReadableStream);
  await s3.send(
    new PutObjectCommand({
      Bucket: bucket,
      Key: key,
      Body: bodyStream,
      ContentType: contentType,
    }),
  );

  const rows = await db<
    {
      id: string;
      status: "new" | "processing" | "ready" | "failed";
    }[]
  >`
    insert into assets (bucket, media_type, mime_type, source_key, active_key)
    values (${bucket}, ${mediaType}, ${contentType}, ${key}, ${key})
    on conflict (bucket, source_key)
    do update set active_key = excluded.active_key
    returning id, status
  `;

  const asset = rows[0];
  if (!asset) {
    return { status: 500, body: { error: "asset_insert_failed" } };
  }

  await enqueueProcessAsset({ assetId: asset.id });

  return {
    status: 200,
    body: { ok: true, importId: imp.id, assetId: asset.id, bucket, key },
  };
}

export async function handleScanMinioImport(input: {
  adminOk: boolean;
  params: { id: string };
  body: unknown;
}): Promise<{ status: number; body: unknown }> {
  if (!input.adminOk) {
    return { status: 401, body: { error: "admin_required" } };
  }

  const paramsParsed = scanParamsSchema.safeParse(input.params);
  if (!paramsParsed.success) {
    return {
      status: 400,
      body: { error: "invalid_params", issues: paramsParsed.error.issues },
    };
  }
  const params = paramsParsed.data;
  const body = scanBodySchema.parse(input.body ?? {});

  const { getMinioBucket } = await import("@tline/minio");
  const { enqueueScanMinioPrefix } = await import("@tline/queue");

  const bucket = body.bucket ?? getMinioBucket();
  const db = getDb();
  const rows = await db<{ id: string }[]>`
    select id
    from imports
    where id = ${params.id}
    limit 1
  `;

  const imp = rows[0];
  if (!imp) {
    return { status: 404, body: { error: "not_found" } };
  }

  await enqueueScanMinioPrefix({
    importId: imp.id,
    bucket,
    prefix: body.prefix,
  });

  await db`
    update imports
    set status = 'queued'
    where id = ${imp.id}
  `;

  return {
    status: 200,
    body: { ok: true, importId: imp.id, bucket, prefix: body.prefix },
  };
}