// ABOUTME: API route for managing training overrides.
// ABOUTME: Handles flare, stress, sleep, and PMS override toggles.
import type { NextRequest } from "next/server";
import { NextResponse } from "next/server";

import { withAuth } from "@/lib/auth-middleware";
import { logger } from "@/lib/logger";
import type { OverrideType } from "@/types";

const VALID_OVERRIDE_TYPES: OverrideType[] = [
  "flare",
  "stress",
  "sleep",
  "pms",
];

function isValidOverrideType(value: unknown): value is OverrideType {
  return (
    typeof value === "string" &&
    VALID_OVERRIDE_TYPES.includes(value as OverrideType)
  );
}

/**
 * POST /api/overrides - Add an override to the user's active overrides.
 * Request body: { override: OverrideType }
 * Response: { activeOverrides: OverrideType[] }
 */
export const POST = withAuth(async (request: NextRequest, user, pb) => {
  const body = await request.json();

  if (!body.override) {
    return NextResponse.json(
      { error: "Missing required field: override" },
      { status: 400 },
    );
  }

  if (!isValidOverrideType(body.override)) {
    return NextResponse.json(
      {
        error: `Invalid override type: ${body.override}. Valid types: ${VALID_OVERRIDE_TYPES.join(", ")}`,
      },
      { status: 400 },
    );
  }

  const overrideToAdd: OverrideType = body.override;

  // Build the new array, avoiding duplicates
  const currentOverrides = user.activeOverrides || [];
  const newOverrides = currentOverrides.includes(overrideToAdd)
    ? currentOverrides
    : [...currentOverrides, overrideToAdd];

  // Update the user record in PocketBase
  await pb
    .collection("users")
    .update(user.id, { activeOverrides: newOverrides });

  // Log override toggle per observability spec
  logger.info(
    { userId: user.id, override: overrideToAdd, enabled: true },
    "Override toggled",
  );

  return NextResponse.json({ activeOverrides: newOverrides });
});

/**
 * DELETE /api/overrides - Remove an override from the user's active overrides.
 * Request body: { override: OverrideType }
 * Response: { activeOverrides: OverrideType[] }
 */
export const DELETE = withAuth(async (request: NextRequest, user, pb) => {
  const body = await request.json();

  if (!body.override) {
    return NextResponse.json(
      { error: "Missing required field: override" },
      { status: 400 },
    );
  }

  if (!isValidOverrideType(body.override)) {
    return NextResponse.json(
      {
        error: `Invalid override type: ${body.override}. Valid types: ${VALID_OVERRIDE_TYPES.join(", ")}`,
      },
      { status: 400 },
    );
  }

  const overrideToRemove: OverrideType = body.override;

  // Remove the override from the array
  const currentOverrides = user.activeOverrides || [];
  const newOverrides = currentOverrides.filter((o) => o !== overrideToRemove);

  // Update the user record in PocketBase
  await pb
    .collection("users")
    .update(user.id, { activeOverrides: newOverrides });

  // Log override toggle per observability spec
  logger.info(
    { userId: user.id, override: overrideToRemove, enabled: false },
    "Override toggled",
  );

  return NextResponse.json({ activeOverrides: newOverrides });
});