"use server";

import { z } from "zod";
import { and, desc, eq, inArray, isNull } from "drizzle-orm";
import { revalidatePath } from "next/cache";
import { auth } from "@/lib/auth";
import { db } from "@/lib/db";
import {
  accounts,
  channels,
  type Channel,
} from "@/lib/db/schema";

async function requireUser() {
  const session = await auth();
  if (!session?.user?.id) {
    throw new Error("请先登录");
  }
  return session.user.id;
}

const channelSchema = z.object({
  channelType: z.enum(["PAYMENT_CARD", "E_WALLET", "CASH", "TRANSFER"] as const),
  refAccounts: z.array(z.string().uuid("无效的账户标识")).min(1, "请至少关联一个资金账户"),
  desc: z.string().max(500).optional().nullable(),
  ext: z.string().optional().nullable(),

  // 支付卡特定字段
  region: z.string().max(10).optional().nullable(),
  issuerName: z.string().max(100).optional().nullable(),
  cardType: z.enum(["CREDIT", "DEBIT"] as const).optional().nullable(),
  cardNumberFull: z.string().max(100).optional().nullable(),
  cardNumberSuffix: z.string().max(10).optional().nullable(),
  cardBrand: z.string().max(32).optional().nullable(),

  // 电子钱包特定字段
  platform: z.string().max(64).optional().nullable(),
  platformAccountId: z.string().max(100).optional().nullable(),
  subChannel: z.string().max(64).optional().nullable(),
  subChannelType: z.enum(["CREDIT", "DEBIT"] as const).optional().nullable(),
});

export type ChannelInput = z.infer<typeof channelSchema>;

export type ChannelWithAccountNames = Channel & {
  linkedAccounts: { id: string; name: string }[];
};

export async function getChannelsAction(): Promise<{
  success: boolean;
  data?: ChannelWithAccountNames[];
  error?: string;
}> {
  try {
    const userId = await requireUser();

    const userChannels = await db
      .select()
      .from(channels)
      .where(and(eq(channels.userId, userId), isNull(channels.deletedAt)))
      .orderBy(desc(channels.createdAt));

    const userAccounts = await db
      .select({ id: accounts.id, name: accounts.name })
      .from(accounts)
      .where(and(eq(accounts.userId, userId), isNull(accounts.deletedAt)));

    const accountMap = new Map(userAccounts.map((a) => [a.id, a.name]));

    const result: ChannelWithAccountNames[] = userChannels.map((ch) => {
      const linked: { id: string; name: string }[] = [];
      if (Array.isArray(ch.refAccounts)) {
        for (const accId of ch.refAccounts) {
          const name = accountMap.get(accId);
          if (name) {
            linked.push({ id: accId, name });
          }
        }
      }
      return {
        ...ch,
        linkedAccounts: linked,
      };
    });

    return { success: true, data: result };
  } catch (err) {
    console.error("getChannelsAction error:", err);
    return { success: false, error: err instanceof Error ? err.message : "获取渠道失败" };
  }
}

export async function createChannelAction(
  data: ChannelInput
): Promise<{ success: boolean; data?: Channel; error?: string }> {
  try {
    const userId = await requireUser();
    const parsed = channelSchema.safeParse(data);
    if (!parsed.success) {
      return { success: false, error: parsed.error.issues[0]?.message || "参数错误" };
    }

    const val = parsed.data;

    // 校验关联的所有账户必须属于当前登录用户
    const userOwnedAccounts = await db
      .select({ id: accounts.id })
      .from(accounts)
      .where(
        and(
          eq(accounts.userId, userId),
          inArray(accounts.id, val.refAccounts),
          isNull(accounts.deletedAt)
        )
      );

    if (userOwnedAccounts.length !== val.refAccounts.length) {
      return { success: false, error: "关联的部分账户不存在或已被删除" };
    }

    // 自动提取或补全卡号后4位
    let suffix = val.cardNumberSuffix?.trim() || null;
    if (!suffix && val.cardNumberFull && val.cardNumberFull.length >= 4) {
      suffix = val.cardNumberFull.slice(-4);
    }

    const [newChannel] = await db
      .insert(channels)
      .values({
        userId,
        channelType: val.channelType,
        refAccounts: val.refAccounts,
        isActive: true,
        desc: val.desc?.trim() || null,
        ext: val.ext?.trim() || null,
        region: val.region ? val.region.toUpperCase().trim() : null,
        issuerName: val.issuerName?.trim() || null,
        cardType: val.cardType || null,
        cardNumberFull: val.cardNumberFull?.trim() || null,
        cardNumberSuffix: suffix,
        cardBrand: val.cardBrand?.trim() || null,
        platform: val.platform?.trim() || null,
        platformAccountId: val.platformAccountId?.trim() || null,
        subChannel: val.subChannel?.trim() || null,
        subChannelType: val.subChannelType || null,
      })
      .returning();

    revalidatePath("/channels");
    revalidatePath("/accounts");
    revalidatePath("/");
    return { success: true, data: newChannel };
  } catch (err) {
    console.error("createChannelAction error:", err);
    return { success: false, error: err instanceof Error ? err.message : "创建渠道失败" };
  }
}

export async function updateChannelAction(
  id: string,
  data: ChannelInput
): Promise<{ success: boolean; data?: Channel; error?: string }> {
  try {
    const userId = await requireUser();
    const parsed = channelSchema.safeParse(data);
    if (!parsed.success) {
      return { success: false, error: parsed.error.issues[0]?.message || "参数错误" };
    }

    const val = parsed.data;

    const userOwnedAccounts = await db
      .select({ id: accounts.id })
      .from(accounts)
      .where(
        and(
          eq(accounts.userId, userId),
          inArray(accounts.id, val.refAccounts),
          isNull(accounts.deletedAt)
        )
      );

    if (userOwnedAccounts.length !== val.refAccounts.length) {
      return { success: false, error: "关联的部分账户不存在或已被删除" };
    }

    let suffix = val.cardNumberSuffix?.trim() || null;
    if (!suffix && val.cardNumberFull && val.cardNumberFull.length >= 4) {
      suffix = val.cardNumberFull.slice(-4);
    }

    const [updated] = await db
      .update(channels)
      .set({
        channelType: val.channelType,
        refAccounts: val.refAccounts,
        desc: val.desc?.trim() || null,
        ext: val.ext?.trim() || null,
        region: val.region ? val.region.toUpperCase().trim() : null,
        issuerName: val.issuerName?.trim() || null,
        cardType: val.cardType || null,
        cardNumberFull: val.cardNumberFull?.trim() || null,
        cardNumberSuffix: suffix,
        cardBrand: val.cardBrand?.trim() || null,
        platform: val.platform?.trim() || null,
        platformAccountId: val.platformAccountId?.trim() || null,
        subChannel: val.subChannel?.trim() || null,
        subChannelType: val.subChannelType || null,
        updatedAt: new Date(),
      })
      .where(and(eq(channels.id, id), eq(channels.userId, userId), isNull(channels.deletedAt)))
      .returning();

    if (!updated) {
      return { success: false, error: "渠道不存在或无权修改" };
    }

    revalidatePath("/channels");
    revalidatePath("/accounts");
    revalidatePath("/");
    return { success: true, data: updated };
  } catch (err) {
    console.error("updateChannelAction error:", err);
    return { success: false, error: err instanceof Error ? err.message : "更新渠道失败" };
  }
}

export async function toggleChannelActiveAction(
  id: string,
  isActive: boolean
): Promise<{ success: boolean; error?: string }> {
  try {
    const userId = await requireUser();
    await db
      .update(channels)
      .set({
        isActive,
        updatedAt: new Date(),
      })
      .where(and(eq(channels.id, id), eq(channels.userId, userId), isNull(channels.deletedAt)));

    revalidatePath("/channels");
    revalidatePath("/accounts");
    revalidatePath("/");
    return { success: true };
  } catch (err) {
    console.error("toggleChannelActiveAction error:", err);
    return { success: false, error: err instanceof Error ? err.message : "状态切换失败" };
  }
}

export async function deleteChannelAction(
  id: string
): Promise<{ success: boolean; error?: string }> {
  try {
    const userId = await requireUser();
    const [deleted] = await db
      .update(channels)
      .set({
        deletedAt: new Date(),
        updatedAt: new Date(),
      })
      .where(and(eq(channels.id, id), eq(channels.userId, userId), isNull(channels.deletedAt)))
      .returning();

    if (!deleted) {
      return { success: false, error: "渠道不存在或已删除" };
    }

    revalidatePath("/channels");
    revalidatePath("/accounts");
    revalidatePath("/");
    return { success: true };
  } catch (err) {
    console.error("deleteChannelAction error:", err);
    return { success: false, error: err instanceof Error ? err.message : "删除渠道失败" };
  }
}