/**
 * Drizzle Page Repository Adapter
 *
 * Implements PageRepository interface using Drizzle ORM.
 */

import { eq, isNull, and, asc, inArray } from 'drizzle-orm';
import { nanoid } from 'nanoid';
import type { DrizzleDatabase } from '../../index.js';
import { pages, type Page } from '../../schema.js';
import type {
  PageRepository,
  CreatePageData,
  UpdatePageData,
} from '../page-repository.js';

export class DrizzlePageRepository implements PageRepository {
  constructor(private db: DrizzleDatabase) {}

  async create(data: CreatePageData): Promise<Page> {
    const id = data.id ?? nanoid();
    const now = new Date();

    const [created] = await this.db.insert(pages).values({
      id,
      ...data,
      createdAt: now,
      updatedAt: now,
    }).returning();

    return created;
  }

  async findById(id: string): Promise<Page | null> {
    const result = await this.db
      .select()
      .from(pages)
      .where(eq(pages.id, id))
      .limit(1);

    return result[0] ?? null;
  }

  async findByIds(ids: string[]): Promise<Page[]> {
    if (ids.length === 0) return [];
    return this.db
      .select()
      .from(pages)
      .where(inArray(pages.id, ids));
  }

  async findByInitiativeId(initiativeId: string): Promise<Page[]> {
    return this.db
      .select()
      .from(pages)
      .where(eq(pages.initiativeId, initiativeId))
      .orderBy(asc(pages.sortOrder));
  }

  async findByParentPageId(parentPageId: string): Promise<Page[]> {
    return this.db
      .select()
      .from(pages)
      .where(eq(pages.parentPageId, parentPageId))
      .orderBy(asc(pages.sortOrder));
  }

  async findRootPage(initiativeId: string): Promise<Page | null> {
    const result = await this.db
      .select()
      .from(pages)
      .where(
        and(
          eq(pages.initiativeId, initiativeId),
          isNull(pages.parentPageId),
        ),
      )
      .limit(1);

    return result[0] ?? null;
  }

  async getOrCreateRootPage(initiativeId: string): Promise<Page> {
    const existing = await this.findRootPage(initiativeId);
    if (existing) return existing;

    return this.create({
      initiativeId,
      parentPageId: null,
      title: 'Untitled',
      content: null,
      sortOrder: 0,
    });
  }

  async update(id: string, data: UpdatePageData): Promise<Page> {
    const [updated] = await this.db
      .update(pages)
      .set({ ...data, updatedAt: new Date() })
      .where(eq(pages.id, id))
      .returning();

    if (!updated) {
      throw new Error(`Page not found: ${id}`);
    }

    return updated;
  }

  async delete(id: string): Promise<void> {
    const [deleted] = await this.db.delete(pages).where(eq(pages.id, id)).returning();

    if (!deleted) {
      throw new Error(`Page not found: ${id}`);
    }
  }
}