import { db } from "@/lib/db";
import { NotificationType } from "@prisma/client";

export interface CreateNotificationPayload {
  userId: string;
  type: NotificationType;
  title: string;
  message: string;
  data?: Record<string, unknown>;
}

/**
 * Create a single in-app notification.
 */
export async function createNotification(
  payload: CreateNotificationPayload
) {
  return db.notification.create({
    data: {
      userId: payload.userId,
      type: payload.type,
      title: payload.title,
      message: payload.message,
      data: (payload.data ?? {}) as any,
    },
  });
}

/**
 * Create notifications for multiple users at once.
 */
export async function createNotifications(
  payloads: CreateNotificationPayload[]
) {
  return db.notification.createMany({
    data: payloads.map((p) => ({
      userId: p.userId,
      type: p.type,
      title: p.title,
      message: p.message,
      data: (p.data ?? {}) as any,
    })),
  });
}

/**
 * Notify all ADMIN, PRODUCER, and SUPERVISOR users about a new version upload.
 */
export async function notifyNewVersionUploaded(params: {
  shotCode: string;
  versionNumber: number;
  projectId: string;
  versionId: string;
  artistName: string;
}) {
  const staff = await db.user.findMany({
    where: {
      role: { in: ["ADMIN", "PRODUCER", "SUPERVISOR"] },
      isActive: true,
    },
    select: { id: true },
  });

  const label = `v${String(params.versionNumber).padStart(3, "0")}`;

  await createNotifications(
    staff.map((u) => ({
      userId: u.id,
      type: NotificationType.VERSION_UPLOADED,
      title: "New version uploaded",
      message: `${params.shotCode} ${label} uploaded by ${params.artistName}`,
      data: {
        versionId: params.versionId,
        shotCode: params.shotCode,
        versionNumber: params.versionNumber,
      },
    }))
  );
}

/**
 * Notify the shot's artist about new feedback.
 */
export async function notifyFeedbackAdded(params: {
  artistId: string;
  shotCode: string;
  frameNumber: number;
  versionId: string;
  authorName: string;
}) {
  await createNotification({
    userId: params.artistId,
    type: NotificationType.FEEDBACK_ADDED,
    title: "New feedback on your shot",
    message: `${params.authorName} commented on ${params.shotCode} at frame ${params.frameNumber}`,
    data: {
      versionId: params.versionId,
      shotCode: params.shotCode,
      frameNumber: params.frameNumber,
    },
  });
}

/**
 * Notify relevant users of an approval status change.
 */
export async function notifyApprovalChange(params: {
  artistId: string | null;
  shotCode: string;
  versionId: string;
  status: "APPROVED" | "REJECTED" | "NEEDS_CHANGES";
  reviewerName: string;
}) {
  if (!params.artistId) return;

  const typeMap = {
    APPROVED: NotificationType.SHOT_APPROVED,
    REJECTED: NotificationType.SHOT_REJECTED,
    NEEDS_CHANGES: NotificationType.REVISION_REQUESTED,
  } as const;

  const msgMap = {
    APPROVED: `${params.shotCode} was approved by ${params.reviewerName}`,
    REJECTED: `${params.shotCode} was rejected by ${params.reviewerName}`,
    NEEDS_CHANGES: `${params.shotCode} needs changes — ${params.reviewerName}`,
  } as const;

  await createNotification({
    userId: params.artistId,
    type: typeMap[params.status],
    title: msgMap[params.status],
    message: msgMap[params.status],
    data: { versionId: params.versionId, shotCode: params.shotCode },
  });
}

/**
 * Notify an artist that a task has been assigned to them.
 */
export async function notifyTaskAssigned(params: {
  artistId: string;
  taskTitle: string;
  taskId: string;
  contextCode: string | null;
  assignedByName: string;
}) {
  await createNotification({
    userId: params.artistId,
    type: NotificationType.TASK_ASSIGNED,
    title: "New task assigned to you",
    message: `${params.assignedByName} assigned you: ${params.taskTitle}${
      params.contextCode ? ` (${params.contextCode})` : ""
    }`,
    data: { taskId: params.taskId },
  });
}

/**
 * Notify supervisors/producers that a task is ready for internal review.
 */
export async function notifyTaskReadyForReview(params: {
  taskId: string;
  taskTitle: string;
  contextCode: string | null;
  artistName: string;
  projectId: string;
  taskUrl: string;
}) {
  const staff = await db.user.findMany({
    where: {
      role: { in: ["ADMIN", "PRODUCER", "SUPERVISOR"] },
      isActive: true,
    },
    select: { id: true },
  });

  const label = params.contextCode ? `${params.contextCode} — ` : "";
  await createNotifications(
    staff.map((u) => ({
      userId: u.id,
      type: NotificationType.TASK_READY_FOR_REVIEW,
      title: "Task ready for review",
      message: `${label}${params.taskTitle} marked ready by ${params.artistName}`,
      data: { taskId: params.taskId, taskUrl: params.taskUrl },
    }))
  );
}

/**
 * Notify an artist that a task has been approved.
 */
export async function notifyTaskApproved(params: {
  artistId: string;
  taskTitle: string;
  taskId: string;
  contextCode: string | null;
  reviewerName: string;
}) {
  await createNotification({
    userId: params.artistId,
    type: NotificationType.TASK_APPROVED,
    title: "Task approved",
    message: `${params.reviewerName} approved: ${params.taskTitle}${
      params.contextCode ? ` (${params.contextCode})` : ""
    }`,
    data: { taskId: params.taskId },
  });
}

/**
 * Notify an artist that changes were requested on their task.
 */
export async function notifyTaskChangesRequested(params: {
  artistId: string;
  taskTitle: string;
  taskId: string;
  contextCode: string | null;
  reviewerName: string;
}) {
  await createNotification({
    userId: params.artistId,
    type: NotificationType.TASK_CHANGES_REQUESTED,
    title: "Changes requested on task",
    message: `${params.reviewerName} requested changes: ${params.taskTitle}${
      params.contextCode ? ` (${params.contextCode})` : ""
    }`,
    data: { taskId: params.taskId },
  });
}

/**
 * Notify a comment author about a new reply.
 */
export async function notifyCommentReply(params: {
  commentAuthorId: string;
  replierName: string;
  shotCode: string;
  frameNumber: number;
  versionId: string;
}) {
  await createNotification({
    userId: params.commentAuthorId,
    type: NotificationType.COMMENT_REPLY,
    title: "New reply to your comment",
    message: `${params.replierName} replied on ${params.shotCode} frame ${params.frameNumber}`,
    data: {
      versionId: params.versionId,
      shotCode: params.shotCode,
      frameNumber: params.frameNumber,
    },
  });
}