/**
 * Page Router — CRUD, tree operations
 */

import { TRPCError } from '@trpc/server';
import { z } from 'zod';
import type { ProcedureBuilder } from '../trpc.js';
import { requirePageRepository } from './_helpers.js';

export function pageProcedures(publicProcedure: ProcedureBuilder) {
  return {
    getRootPage: publicProcedure
      .input(z.object({ initiativeId: z.string().min(1) }))
      .query(async ({ ctx, input }) => {
        const repo = requirePageRepository(ctx);
        return repo.getOrCreateRootPage(input.initiativeId);
      }),

    getPage: publicProcedure
      .input(z.object({ id: z.string().min(1) }))
      .query(async ({ ctx, input }) => {
        const repo = requirePageRepository(ctx);
        const page = await repo.findById(input.id);
        if (!page) {
          throw new TRPCError({
            code: 'NOT_FOUND',
            message: `Page '${input.id}' not found`,
          });
        }
        return page;
      }),

    getPageUpdatedAtMap: publicProcedure
      .input(z.object({ ids: z.array(z.string().min(1)) }))
      .query(async ({ ctx, input }) => {
        const repo = requirePageRepository(ctx);
        const foundPages = await repo.findByIds(input.ids);
        const map: Record<string, string> = {};
        for (const p of foundPages) {
          map[p.id] = p.updatedAt instanceof Date ? p.updatedAt.toISOString() : String(p.updatedAt);
        }
        return map;
      }),

    listPages: publicProcedure
      .input(z.object({ initiativeId: z.string().min(1) }))
      .query(async ({ ctx, input }) => {
        const repo = requirePageRepository(ctx);
        return repo.findByInitiativeId(input.initiativeId);
      }),

    listChildPages: publicProcedure
      .input(z.object({ parentPageId: z.string().min(1) }))
      .query(async ({ ctx, input }) => {
        const repo = requirePageRepository(ctx);
        return repo.findByParentPageId(input.parentPageId);
      }),

    createPage: publicProcedure
      .input(z.object({
        initiativeId: z.string().min(1),
        parentPageId: z.string().min(1).nullable(),
        title: z.string().min(1),
      }))
      .mutation(async ({ ctx, input }) => {
        const repo = requirePageRepository(ctx);
        const page = await repo.create({
          initiativeId: input.initiativeId,
          parentPageId: input.parentPageId,
          title: input.title,
          content: null,
          sortOrder: 0,
        });
        ctx.eventBus.emit({
          type: 'page:created',
          timestamp: new Date(),
          payload: { pageId: page.id, initiativeId: input.initiativeId, title: input.title },
        });
        return page;
      }),

    updatePage: publicProcedure
      .input(z.object({
        id: z.string().min(1),
        title: z.string().min(1).optional(),
        content: z.string().nullable().optional(),
        sortOrder: z.number().int().optional(),
      }))
      .mutation(async ({ ctx, input }) => {
        const repo = requirePageRepository(ctx);
        const { id, ...data } = input;
        const page = await repo.update(id, data);
        ctx.eventBus.emit({
          type: 'page:updated',
          timestamp: new Date(),
          payload: { pageId: id, initiativeId: page.initiativeId, title: input.title },
        });
        return page;
      }),

    deletePage: publicProcedure
      .input(z.object({ id: z.string().min(1) }))
      .mutation(async ({ ctx, input }) => {
        const repo = requirePageRepository(ctx);
        const page = await repo.findById(input.id);
        await repo.delete(input.id);
        if (page) {
          ctx.eventBus.emit({
            type: 'page:deleted',
            timestamp: new Date(),
            payload: { pageId: input.id, initiativeId: page.initiativeId },
          });
        }
        return { success: true };
      }),
  };
}