// app/api/submit/settings/route.ts
import { NextRequest, NextResponse } from "next/server";
import {
  bytesFromMB,
  createSettingsItem,
  directusFetch,
  uploadFile,
} from "@/lib/directus";

/** ─────────────────────────────────────────────────────────────
 * Accepts EITHER:
 *  - application/json  (photo/screen can be data URLs: photo_data, screen_data)
 *  - multipart/form-data with:
 *      - "payload"  = JSON string (same shape as JSON body)
 *      - "photo"    = result image (REQUIRED)
 *      - "screen"   = screenshot image (optional)
 *
 * Targets (collections):
 *  - settings_fiber   (+ laser_soft, repeat_all)
 *  - settings_co2gan
 *  - settings_co2gal
 *  - settings_uv
 * ──────────────────────────────────────────────────────────── */

export const runtime = "nodejs";

const MAX_MB = Number(process.env.FILE_MAX_MB || 25);
const MAX_BYTES = bytesFromMB(MAX_MB);

// light in-memory rate limiter
const BUCKET = new Map<string, { c: number; resetAt: number }>();
const WINDOW_MS = Number(process.env.RATE_LIMIT_WINDOW || 60) * 1000;
const MAX_REQ = Number(process.env.RATE_LIMIT_MAX || 15);
function rateLimitOk(ip: string) {
  const now = Date.now();
  const rec = BUCKET.get(ip);
  if (!rec || now > rec.resetAt) {
    BUCKET.set(ip, { c: 1, resetAt: now + WINDOW_MS });
    return true;
  }
  if (rec.c >= MAX_REQ) return false;
  rec.c += 1;
  return true;
}

type Target = "settings_fiber" | "settings_co2gan" | "settings_co2gal" | "settings_uv";

/** Map target + kind → Directus folder name */
function folderName(target: Target, kind: "photo" | "screen") {
  const base =
    target === "settings_fiber"
      ? "le_fiber_settings"
      : target === "settings_uv"
      ? "le_uv_settings"
      : target === "settings_co2gal"
      ? "le_co2gal_settings"
      : "le_co2gan_settings";
  return kind === "photo" ? `${base}_photos` : `${base}_screenshots`;
}

/** Lookup a folder id by name, returns null if not found */
async function findFolderIdByName(name: string): Promise<string | null> {
  try {
    const res = await directusFetch<{ data: Array<{ id: string }> }>(
      `/folders?limit=1&fields=id&filter[name][_eq]=${encodeURIComponent(name)}`
    );
    const id = res?.data?.[0]?.id ?? null;
    return id || null;
  } catch {
    return null;
  }
}

/** Patch a file to move it into a folder (no-op if folderId is null) */
async function moveFileToFolder(fileId: string, folderId: string | null) {
  if (!fileId || !folderId) return;
  await directusFetch(`/files/${fileId}`, {
    method: "PATCH",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ folder: folderId }),
  });
}

// Whitelists for repeaters (matches your Directus repeater schemas)
const FILL_KEYS = new Set([
  "name",
  "power",
  "speed",
  "interval",
  "pass",
  "type",
  "flood",
  "air",
  "frequency",
  "pulse",
  "angle",
  "auto",
  "increment",
  "cross",
]);
const LINE_KEYS = new Set([
  "name",
  "power",
  "speed",
  "perf",
  "cut",
  "skip",
  "pass",
  "air",
  "frequency",
  "pulse",
  "wobble",
  "step",
  "size",
]);
const RASTER_KEYS = new Set([
  "name",
  "power",
  "speed",
  "type",
  "dither",
  "halftone_cell",
  "halftone_angle",
  "inversion",
  "interval",
  "dot",
  "pass",
  "air",
  "frequency",
  "pulse",
  "cross",
]);

function sanitizeNumber(n: any, fallback: number | null = null) {
  if (n === null || n === undefined || n === "") return fallback;
  const v = Number(n);
  return Number.isFinite(v) ? v : fallback;
}

function sanitizeRepeaterRow(
  row: Record<string, any>,
  allowed: Set<string>
): Record<string, any> {
  const out: Record<string, any> = {};
  for (const k of Object.keys(row || {})) {
    if (!allowed.has(k)) continue;
    if (
      [
        "power",
        "speed",
        "interval",
        "pass",
        "halftone_cell",
        "halftone_angle",
        "dot",
        "frequency",
        "pulse",
        "angle",
        "increment",
        "step",
        "size",
      ].includes(k)
    ) {
      out[k] = sanitizeNumber(row[k]);
    } else if (["auto", "cross", "wobble", "perf", "air", "flood", "inversion"].includes(k)) {
      out[k] = !!row[k];
    } else {
      out[k] = row[k];
    }
  }
  return out;
}

async function readJsonOrMultipart(req: NextRequest) {
  const ct = req.headers.get("content-type") || "";

  if (ct.includes("multipart/form-data")) {
    const form = await req.formData();
    const payloadRaw = String(form.get("payload") || "{}");
    let body: any = {};
    try {
      body = JSON.parse(payloadRaw);
    } catch {
      throw new Error("Invalid JSON in 'payload' field");
    }
    const files = {
      photo: (form.get("photo") as File) || null,
      screen: (form.get("screen") as File) || null,
    };
    return { mode: "multipart" as const, body, files };
  }

  if (ct.includes("application/json")) {
    const body = await req.json();
    return { mode: "json" as const, body, files: { photo: null as File | null, screen: null as File | null } };
  }

  throw new Error("Unsupported content-type. Use JSON or multipart/form-data.");
}

export async function POST(req: NextRequest) {
  const started = Date.now();
  try {
    const ip =
      req.headers.get("x-forwarded-for")?.split(",")[0]?.trim() ||
      "0.0.0.0";
    if (!rateLimitOk(ip)) {
      return NextResponse.json({ error: "Rate limited" }, { status: 429 });
    }

    const { mode, body, files } = await readJsonOrMultipart(req);

    const target: Target = body?.target;
    if (!["settings_fiber", "settings_co2gan", "settings_co2gal", "settings_uv"].includes(target as any)) {
      return NextResponse.json({ error: "Invalid target" }, { status: 400 });
    }

    // Required base fields
    const setting_title = String(body?.setting_title || body?.title || "").trim();
    const uploader = String(body?.uploader || "").trim();

    // Relations (required)
    const mat         = body?.mat ?? null;
    const mat_coat    = body?.mat_coat ?? null;
    const mat_color   = body?.mat_color ?? null;
    const mat_opacity = body?.mat_opacity ?? null;
    const source      = body?.source ?? null;
    const lens        = body?.lens ?? null;

    // Numbers
    const mat_thickness = sanitizeNumber(body?.mat_thickness, null);
    const focus         = sanitizeNumber(body?.focus, null);

    // Notes (optional)
    const setting_notes = String(body?.setting_notes || body?.notes || "").trim() || "";

    // Fiber-only (required)
    const laser_soft =
      target === "settings_fiber" ? (body?.laser_soft ?? null) : null;
    const repeat_all =
      target === "settings_fiber" ? sanitizeNumber(body?.repeat_all, null) : null;

    // Validate requireds
    const missing: string[] = [];
    if (!setting_title) missing.push("setting_title");
    if (!uploader) missing.push("uploader");
    if (!source) missing.push("source");
    if (!lens) missing.push("lens");
    if (focus === null || !Number.isFinite(focus)) missing.push("focus");
    if (!mat) missing.push("mat");
    if (!mat_coat) missing.push("mat_coat");
    if (!mat_color) missing.push("mat_color");
    if (!mat_opacity) missing.push("mat_opacity");
    if (target === "settings_fiber") {
      if (!laser_soft) missing.push("laser_soft");
      if (repeat_all === null || !Number.isFinite(repeat_all)) missing.push("repeat_all");
    }

    // Handle files (photo required)
    let photo_id: string | null = null;
    let screen_id: string | null = null;

    // If multipart, use file objects. Else allow base64 in JSON: photo_data/screen_data
    if (mode === "multipart") {
      if (!files.photo) missing.push("photo");
      if (files.photo) {
        if (files.photo.size > MAX_BYTES) {
          return NextResponse.json(
            { error: `Photo exceeds ${MAX_MB} MB` },
            { status: 400 }
          );
        }
        const up = await uploadFile(files.photo, (files.photo as File).name || "photo");
        photo_id = (up as any)?.id ?? null;

        // after upload, move into appropriate folder
        const folder = await findFolderIdByName(folderName(target, "photo"));
        await moveFileToFolder(String(photo_id), folder);
      }
      if (files.screen) {
        if (files.screen.size > MAX_BYTES) {
          return NextResponse.json(
            { error: `Screenshot exceeds ${MAX_MB} MB` },
            { status: 400 }
          );
        }
        const up = await uploadFile(files.screen, (files.screen as File).name || "screen");
        screen_id = (up as any)?.id ?? null;
        const folder = await findFolderIdByName(folderName(target, "screen"));
        await moveFileToFolder(String(screen_id), folder);
      }
    } else {
      // JSON mode with optional base64 strings
      const pushBase64 = async (dataUrl: string, name: string) => {
        const base64 = (dataUrl || "").split(",")[1] || "";
        if (!base64) return null;
        const raw = Buffer.from(base64, "base64");
        if (raw.byteLength > MAX_BYTES) throw new Error(`${name} exceeds ${MAX_MB} MB`);
        const blob = new Blob([raw]);
        const up = await uploadFile(blob as any, name);
        return (up as any)?.id ?? null;
      };

      if (body?.photo_data) {
        photo_id = await pushBase64(body.photo_data, "photo");
        const folder = await findFolderIdByName(folderName(target, "photo"));
        await moveFileToFolder(String(photo_id), folder);
      } else {
        missing.push("photo");
      }
      if (body?.screen_data) {
        screen_id = await pushBase64(body.screen_data, "screen");
        const folder = await findFolderIdByName(folderName(target, "screen"));
        await moveFileToFolder(String(screen_id), folder);
      }
    }

    if (missing.length) {
      return NextResponse.json(
        { error: `Missing required: ${missing.join(", ")}` },
        { status: 400 }
      );
    }

    // Repeaters
    const fillsRaw   = Array.isArray(body?.fill_settings)   ? body.fill_settings   : body?.fills   || [];
    const linesRaw   = Array.isArray(body?.line_settings)   ? body.line_settings   : body?.lines   || [];
    const rastersRaw = Array.isArray(body?.raster_settings) ? body.raster_settings : body?.rasters || [];

    const fill_settings   = (fillsRaw as any[]).map((r) => sanitizeRepeaterRow(r, FILL_KEYS));
    const line_settings   = (linesRaw as any[]).map((r) => sanitizeRepeaterRow(r, LINE_KEYS));
    const raster_settings = (rastersRaw as any[]).map((r) => sanitizeRepeaterRow(r, RASTER_KEYS));

    // Build record
    const nowIso = new Date().toISOString();
    const payload: Record<string, any> = {
      setting_title,
      uploader,
      setting_notes,
      // relations
      mat,
      mat_coat,
      mat_color,
      mat_opacity,
      source,
      lens,
      // numbers
      focus,
      mat_thickness,
      // files
      photo: photo_id,
      screen: screen_id,
      // repeaters
      fill_settings,
      line_settings,
      raster_settings,
      // meta
      submission_date: nowIso,
      last_modified_date: nowIso,
      status: "pending",
      submitted_via: "makearmy-app",
      submitted_at: nowIso,
    };

    if (target === "settings_fiber") {
      payload.laser_soft = laser_soft;
      payload.repeat_all = repeat_all;
    }

    const created = await createSettingsItem(target, payload);

    // normalize PK to always provide "id" (your tables use submission_id)
    const newId =
      (created as any)?.submission_id ??
      (created as any)?.data?.submission_id ??
      (created as any)?.id ??
      (created as any)?.data?.id ??
      null;

    return NextResponse.json({
      ok: true,
      id: newId,
      submission_id: newId,
      took_ms: Date.now() - started,
    });
  } catch (err: any) {
    const msg = err?.message || "Unknown error";
    return NextResponse.json({ error: msg }, { status: 500 });
  }
}