import { NextRequest, NextResponse } from "next/server";
import { prisma } from "@/lib/db";
import { requireApiAuthWithOrg, handleApiError } from "@/lib/api-auth";

type RouteContext = { params: Promise<{ id: string }> };

async function getOwnedTemplate(templateId: string, orgId: string) {
  const template = await prisma.formTemplate.findUnique({
    where: { id: templateId },
    include: {
      fields: { orderBy: { sortOrder: "asc" } },
      _count: { select: { cards: true } },
    },
  });
  if (!template || template.organizationId !== orgId) return null;
  return template;
}

export async function GET(_request: NextRequest, ctx: RouteContext) {
  try {
    const session = await requireApiAuthWithOrg();
    const { id } = await ctx.params;

    const template = await getOwnedTemplate(id, session.user.orgId!);
    if (!template) {
      return NextResponse.json(
        { error: "Template not found" },
        { status: 404 }
      );
    }

    return NextResponse.json(template);
  } catch (error) {
    return handleApiError(error);
  }
}

export async function PUT(request: NextRequest, ctx: RouteContext) {
  try {
    const session = await requireApiAuthWithOrg();
    const { id } = await ctx.params;

    const existing = await getOwnedTemplate(id, session.user.orgId!);
    if (!existing) {
      return NextResponse.json(
        { error: "Template not found" },
        { status: 404 }
      );
    }

    const body = await request.json();
    const { name, description, isActive, branding, settings } = body as {
      name?: string;
      description?: string;
      isActive?: boolean;
      branding?: Record<string, unknown>;
      settings?: Record<string, unknown>;
    };

    const data: Record<string, unknown> = {};
    if (name !== undefined) data.name = name.trim();
    if (description !== undefined) data.description = description?.trim() || null;
    if (isActive !== undefined) data.isActive = Boolean(isActive);
    if (branding !== undefined) data.branding = branding;
    if (settings !== undefined) data.settings = settings;

    const updated = await prisma.formTemplate.update({
      where: { id },
      data,
      include: {
        fields: { orderBy: { sortOrder: "asc" } },
        _count: { select: { cards: true } },
      },
    });

    return NextResponse.json(updated);
  } catch (error) {
    return handleApiError(error);
  }
}

export async function DELETE(_request: NextRequest, ctx: RouteContext) {
  try {
    const session = await requireApiAuthWithOrg();
    const { id } = await ctx.params;

    const existing = await getOwnedTemplate(id, session.user.orgId!);
    if (!existing) {
      return NextResponse.json(
        { error: "Template not found" },
        { status: 404 }
      );
    }

    if (existing._count.cards > 0) {
      const deactivated = await prisma.formTemplate.update({
        where: { id },
        data: { isActive: false },
      });
      return NextResponse.json({
        ...deactivated,
        _deactivated: true,
        _reason: "Template has associated cards and was deactivated instead of deleted",
      });
    }

    await prisma.formTemplate.delete({ where: { id } });
    return NextResponse.json({ deleted: true });
  } catch (error) {
    return handleApiError(error);
  }
}