import { and, eq, gt } from "drizzle-orm";
import { userOpenTabs } from "../db/schema.js";
import type { DatabaseContext } from "./database-context.js";

export type OpenTabRecord = typeof userOpenTabs.$inferSelect;
export type NewOpenTabRecord = typeof userOpenTabs.$inferInsert;
export type OpenTabUpdate = Partial<
  Pick<NewOpenTabRecord, "label" | "tabOrder" | "backendSessionId">
>;

export type OpenTabUpsertInput = Pick<
  NewOpenTabRecord,
  "id" | "tabType" | "label" | "tabOrder"
> & {
  hostId?: number | null;
  backendSessionId?: string | null;
};

export class OpenTabRepository {
  constructor(
    private readonly context: DatabaseContext,
    private readonly onWrite?: () => void | Promise<void>,
  ) {}

  async listRecentForUser(
    userId: string,
    updatedAfter: string,
  ): Promise<OpenTabRecord[]> {
    return this.context.drizzle
      .select()
      .from(userOpenTabs)
      .where(
        and(
          eq(userOpenTabs.userId, userId),
          gt(userOpenTabs.updatedAt, updatedAfter),
        ),
      )
      .orderBy(userOpenTabs.tabOrder);
  }

  async upsertForUser(
    userId: string,
    input: OpenTabUpsertInput,
    updatedAt = new Date().toISOString(),
  ): Promise<void> {
    const existing = await this.findByIdForUser(userId, input.id);
    if (existing) {
      await this.context.drizzle
        .update(userOpenTabs)
        .set({
          tabType: input.tabType,
          hostId: input.hostId ?? null,
          label: input.label,
          tabOrder: input.tabOrder,
          backendSessionId:
            input.backendSessionId !== undefined
              ? input.backendSessionId
              : existing.backendSessionId,
          updatedAt,
        })
        .where(
          and(eq(userOpenTabs.id, input.id), eq(userOpenTabs.userId, userId)),
        );
      await this.afterWrite();
      return;
    }

    await this.context.drizzle.insert(userOpenTabs).values({
      id: input.id,
      userId,
      tabType: input.tabType,
      hostId: input.hostId ?? null,
      label: input.label,
      tabOrder: input.tabOrder,
      backendSessionId: input.backendSessionId ?? null,
      updatedAt,
    });
    await this.afterWrite();
  }

  async replaceForUser(
    userId: string,
    tabs: OpenTabUpsertInput[],
    updatedAt = new Date().toISOString(),
  ): Promise<void> {
    await this.context.drizzle
      .delete(userOpenTabs)
      .where(eq(userOpenTabs.userId, userId));

    if (tabs.length > 0) {
      await this.context.drizzle.insert(userOpenTabs).values(
        tabs.map((tab) => ({
          id: tab.id,
          userId,
          tabType: tab.tabType,
          hostId: tab.hostId ?? null,
          label: tab.label,
          tabOrder: tab.tabOrder,
          backendSessionId: tab.backendSessionId ?? null,
          updatedAt,
        })),
      );
    }

    await this.afterWrite();
  }

  async updateForUser(
    userId: string,
    id: string,
    update: OpenTabUpdate,
    updatedAt = new Date().toISOString(),
  ): Promise<boolean> {
    const rows = await this.context.drizzle
      .update(userOpenTabs)
      .set({ ...update, updatedAt })
      .where(and(eq(userOpenTabs.id, id), eq(userOpenTabs.userId, userId)))
      .returning({ id: userOpenTabs.id });

    if (rows.length > 0) {
      await this.afterWrite();
    }

    return rows.length > 0;
  }

  async deleteForUser(userId: string, id: string): Promise<number> {
    const rows = await this.context.drizzle
      .delete(userOpenTabs)
      .where(and(eq(userOpenTabs.id, id), eq(userOpenTabs.userId, userId)))
      .returning({ id: userOpenTabs.id });

    if (rows.length > 0) {
      await this.afterWrite();
    }

    return rows.length;
  }

  async deleteByUserId(userId: string): Promise<number> {
    const rows = await this.context.drizzle
      .delete(userOpenTabs)
      .where(eq(userOpenTabs.userId, userId))
      .returning({ id: userOpenTabs.id });

    if (rows.length > 0) {
      await this.afterWrite();
    }

    return rows.length;
  }

  private async findByIdForUser(
    userId: string,
    id: string,
  ): Promise<OpenTabRecord | null> {
    const rows = await this.context.drizzle
      .select()
      .from(userOpenTabs)
      .where(and(eq(userOpenTabs.id, id), eq(userOpenTabs.userId, userId)))
      .limit(1);

    return rows[0] ?? null;
  }

  private async afterWrite(): Promise<void> {
    await this.onWrite?.();
  }
}