import type { Db } from "@sttracker/db/db";
import { newId, nowIso } from "@sttracker/db/ids";
import type { Database } from "@sttracker/db/schema";
import { createTestContext } from "@sttracker/plugin-sdk/testing";
import { definePlugin, type SourcePlugin, type SourceRecord, type WorkHint } from "@sttracker/plugin-sdk/types";
import type { SyncDeps } from "../../src/sync/run.ts";

export { makeUser, makeWork } from "../user-layer-fixtures.ts";

/** Insert a `source_connections` row directly and return its id. */
export async function makeConnection(db: Db, userId: string, pluginId: string): Promise<string> {
  const id = newId();
  await db.k
    .insertInto("source_connections")
    .values({
      id,
      user_id: userId,
      plugin_id: pluginId,
      name: pluginId,
      config: "{}",
      credentials_enc: null,
      schedule_minutes: null,
      cursor: null,
      status: "active",
      last_run_at: null,
      created_at: nowIso(),
    })
    .execute();
  return id;
}

/** A source whose records the test mutates between runs. `failAfter` makes `pull` throw after that many records. */
export interface FakeSource {
  records: SourceRecord[];
  failAfter?: number;
}

export function fakePlugin(id: string, src: FakeSource): SourcePlugin {
  async function* gen(): AsyncIterable<SourceRecord> {
    let i = 0;
    for (const r of src.records) {
      if (src.failAfter !== undefined && i >= src.failAfter) throw new Error("source exploded");
      yield r;
      i++;
    }
    if (src.failAfter !== undefined && i >= src.failAfter) throw new Error("source exploded");
  }
  return definePlugin({
    manifest: { id, name: id, version: "0.0.0", sdkVersion: 1, mediaTypes: ["book", "movie", "show"], capabilities: ["pull", "pullChanges"], config: [] },
    pull: () => gen(),
    pullChanges: () => gen(),
  });
}

export function deps(db: Db): SyncDeps {
  return { db, makeContext: () => createTestContext() };
}

export function book(isbn: string, title = `Book ${isbn}`): WorkHint {
  return { title, mediaType: "book", externalIds: { isbn13: isbn } };
}

export function entryRec(key: string, work: WorkHint, entry: Extract<SourceRecord, { kind: "entry" }>["entry"], extra: Partial<SourceRecord> = {}): SourceRecord {
  return { key, kind: "entry", work, entry, raw: { key, entry }, ...extra } as SourceRecord;
}

export function engagementRec(
  key: string,
  work: WorkHint,
  engagement: Extract<SourceRecord, { kind: "engagement" }>["engagement"],
): SourceRecord {
  return { key, kind: "engagement", work, engagement, raw: { key } };
}

export function listenRec(key: string, listen: Extract<SourceRecord, { kind: "listen" }>["listen"]): SourceRecord {
  return { key, kind: "listen", listen, raw: { key } };
}

export async function count(db: Db, table: keyof Database): Promise<number> {
  const r = await db.k
    .selectFrom(table)
    .select((eb) => eb.fn.countAll<number>().as("n"))
    .executeTakeFirstOrThrow();
  return Number(r.n);
}

export async function events(db: Db, where: { type?: string; status?: string } = {}) {
  let q = db.k.selectFrom("change_events").selectAll().orderBy("id");
  if (where.type) q = q.where("type", "=", where.type as never);
  if (where.status) q = q.where("status", "=", where.status as never);
  const rows = await q.execute();
  return rows.map((r) => ({ ...r, payload: JSON.parse(r.payload) as Record<string, unknown> }));
}

export async function entryFor(db: Db, userId: string, isbn: string) {
  const ext = await db.k
    .selectFrom("external_ids")
    .select("work_id")
    .where("namespace", "=", "isbn13")
    .where("value", "=", isbn)
    .executeTakeFirst();
  if (!ext) return undefined;
  const row = await db.k
    .selectFrom("entries")
    .selectAll()
    .where("user_id", "=", userId)
    .where("work_id", "=", ext.work_id)
    .executeTakeFirst();
  return row ? { ...row, fieldSources: JSON.parse(row.field_sources) as Record<string, string> } : undefined;
}