/** minute 的持久化(编码规范 §10.2:框架只许出现在 adapter)。 */
import { asc, desc, eq, inArray } from 'drizzle-orm';
import type { Db } from '@shared/db.ts';
import type { Minute, MinuteResolution, ResolutionState } from '../domain/minute.ts';
import type { MinuteStore } from '../../port.ts';
import { minuteResolutions, minutes } from './minute-schema.ts';

type MinuteRow = typeof minutes.$inferSelect;
type ResolutionRow = typeof minuteResolutions.$inferSelect;

const toResolution = (row: ResolutionRow): MinuteResolution => ({
  id: row.id,
  text: row.text,
  ownerId: row.ownerId ?? undefined,
  state: row.state as ResolutionState,
  workflowId: row.workflowId ?? undefined,
  registeredById: row.registeredById ?? undefined,
  registeredAt: row.registeredAt?.toISOString(),
});

const toMinute = (row: MinuteRow, resolutions: readonly ResolutionRow[]): Minute => ({
  id: row.id,
  title: row.title,
  body: row.body,
  authorId: row.authorId,
  participants: row.participants as string[],
  occurredOn: row.occurredOn,
  resolutions: resolutions.map(toResolution),
  createdAt: row.createdAt.toISOString(),
  updatedAt: row.updatedAt.toISOString(),
});

export function createMinuteStore(db: Db): MinuteStore {
  async function loadResolutions(minuteIds: readonly string[]): Promise<Map<string, ResolutionRow[]>> {
    if (minuteIds.length === 0) return new Map();
    const rows = await db
      .select()
      .from(minuteResolutions)
      .where(inArray(minuteResolutions.minuteId, [...minuteIds]))
      .orderBy(asc(minuteResolutions.id));
    const byMinute = new Map<string, ResolutionRow[]>();
    for (const row of rows) {
      const list = byMinute.get(row.minuteId) ?? [];
      list.push(row);
      byMinute.set(row.minuteId, list);
    }
    return byMinute;
  }

  return {
    async list(limit) {
      const rows = await db.select().from(minutes).orderBy(desc(minutes.occurredOn)).limit(limit);
      const byMinute = await loadResolutions(rows.map((r) => r.id));
      return rows.map((row) => toMinute(row, byMinute.get(row.id) ?? []));
    },

    async get(minuteId) {
      const [row] = await db.select().from(minutes).where(eq(minutes.id, minuteId)).limit(1);
      if (row === undefined) return undefined;
      const byMinute = await loadResolutions([minuteId]);
      return toMinute(row, byMinute.get(minuteId) ?? []);
    },

    async save(minute) {
      // 纪要与其决议同事务落笔:决议的登记状态不得与纪要正文脱节
      await db.transaction(async (tx) => {
        await tx
          .insert(minutes)
          .values({
            id: minute.id,
            title: minute.title,
            body: minute.body,
            authorId: minute.authorId,
            participants: [...minute.participants],
            occurredOn: minute.occurredOn,
            createdAt: new Date(minute.createdAt),
            updatedAt: new Date(minute.updatedAt),
          })
          .onConflictDoUpdate({
            target: minutes.id,
            set: { title: minute.title, body: minute.body, updatedAt: new Date(minute.updatedAt) },
          });

        for (const r of minute.resolutions) {
          await tx
            .insert(minuteResolutions)
            .values({
              id: r.id,
              minuteId: minute.id,
              text: r.text,
              ownerId: r.ownerId ?? null,
              state: r.state,
              workflowId: r.workflowId ?? null,
              registeredById: r.registeredById ?? null,
              registeredAt: r.registeredAt === undefined ? null : new Date(r.registeredAt),
            })
            .onConflictDoUpdate({
              target: minuteResolutions.id,
              set: {
                state: r.state,
                workflowId: r.workflowId ?? null,
                registeredById: r.registeredById ?? null,
                registeredAt: r.registeredAt === undefined ? null : new Date(r.registeredAt),
              },
            });
        }
      });
    },
  };
}