import { type NextRequest } from "next/server";
import { prisma } from "@/lib/prisma";
import { ok, errorResponse, requireRole, parseJson, ApiError } from "@/lib/api";
import { UpdateOperationSchema } from "@/lib/schemas";
import { audit } from "@/lib/audit";
import { clientIp } from "@/lib/request";

export async function GET(_req: NextRequest, ctx: { params: Promise<{ id: string }> }) {
  try {
    await requireRole("admin");
    const { id } = await ctx.params;
    const operation = await prisma.operation.findUnique({
      where: { id },
      include: {
        machine: { select: { id: true, name: true } },
        template: { select: { id: true, name: true } },
        claimedBy: { select: { id: true, name: true } },
        part: {
          select: {
            id: true,
            code: true,
            name: true,
            assembly: {
              select: {
                id: true,
                code: true,
                project: { select: { id: true, code: true, name: true } },
              },
            },
          },
        },
      },
    });
    if (!operation) throw new ApiError(404, "not_found", "Operation not found");
    return ok({ operation });
  } catch (err) {
    return errorResponse(err);
  }
}

export async function PATCH(req: NextRequest, ctx: { params: Promise<{ id: string }> }) {
  try {
    const actor = await requireRole("admin");
    const { id } = await ctx.params;
    const body = await parseJson(req, UpdateOperationSchema);

    const before = await prisma.operation.findUnique({ where: { id } });
    if (!before) throw new ApiError(404, "not_found", "Operation not found");

    // Refuse to mutate a claimed / in-progress op's sequence — it would scramble
    // the QR card the operator is currently holding. Content edits are allowed.
    if (body.sequence !== undefined && body.sequence !== before.sequence) {
      if (before.status !== "pending") {
        throw new ApiError(
          409,
          "op_not_pending",
          "Cannot resequence an operation that is already in progress or completed",
        );
      }
      const conflict = await prisma.operation.findUnique({
        where: { partId_sequence: { partId: before.partId, sequence: body.sequence } },
        select: { id: true },
      });
      if (conflict && conflict.id !== id)
        throw new ApiError(409, "sequence_taken", `Sequence ${body.sequence} already in use`);
    }

    const updated = await prisma.operation.update({
      where: { id },
      data: {
        ...(body.templateId !== undefined ? { templateId: body.templateId } : {}),
        ...(body.name !== undefined ? { name: body.name } : {}),
        ...(body.machineId !== undefined ? { machineId: body.machineId } : {}),
        ...(body.settings !== undefined ? { settings: body.settings } : {}),
        ...(body.materialNotes !== undefined ? { materialNotes: body.materialNotes } : {}),
        ...(body.instructions !== undefined ? { instructions: body.instructions } : {}),
        ...(body.qcRequired !== undefined ? { qcRequired: body.qcRequired } : {}),
        ...(body.plannedMinutes !== undefined ? { plannedMinutes: body.plannedMinutes } : {}),
        ...(body.plannedUnits !== undefined ? { plannedUnits: body.plannedUnits } : {}),
        ...(body.sequence !== undefined ? { sequence: body.sequence } : {}),
        ...(body.status !== undefined ? { status: body.status } : {}),
      },
    });

    await audit({
      actorId: actor.id,
      action: "update",
      entity: "Operation",
      entityId: id,
      before,
      after: updated,
      ipAddress: clientIp(req),
    });
    return ok({ operation: updated });
  } catch (err) {
    return errorResponse(err);
  }
}

export async function DELETE(req: NextRequest, ctx: { params: Promise<{ id: string }> }) {
  try {
    const actor = await requireRole("admin");
    const { id } = await ctx.params;
    const before = await prisma.operation.findUnique({ where: { id } });
    if (!before) throw new ApiError(404, "not_found", "Operation not found");
    if (before.status === "in_progress") {
      throw new ApiError(
        409,
        "op_in_progress",
        "Release the claim before deleting an in-progress operation",
      );
    }
    await prisma.operation.delete({ where: { id } });
    await audit({
      actorId: actor.id,
      action: "delete",
      entity: "Operation",
      entityId: id,
      before,
      ipAddress: clientIp(req),
    });
    return ok({ ok: true });
  } catch (err) {
    return errorResponse(err);
  }
}