import type Database from "bun:sqlite";

import { describe, expect, test } from "bun:test";

import { and, eq } from "drizzle-orm";

import { notDeleted, wrap } from "../../../src/server/db/connection";
import { createMaterial } from "../../../src/server/db/materials";
import { createProject } from "../../../src/server/db/projects";
import { materials } from "../../../src/server/db/schema";
import { createNoopLogger } from "../../../src/server/logger";
import type { ProcessableMaterial } from "../../../src/server/processing/processor";
import { MaterialProcessor } from "../../../src/server/processing/processor";

import { createMigratedTestDatabase } from "../../helpers";

const LOG = createNoopLogger();

function withProcessorDb(callback: (db: Database) => void): void {
  const handle = createMigratedTestDatabase("processor-test");
  try {
    callback(handle.db);
    handle.close();
  } finally {
    handle.cleanup();
  }
}

function setupProject(db: Database, name = "测试项目"): string {
  const result = createProject(db, { name }, LOG);
  if ("error" in result) throw new Error(result.error);
  return result.project.id;
}

function setupMaterial(
  db: Database,
  projectId: string,
  overrides: Partial<{
    associatedDate: string;
    description: string;
    materialType: "general" | "meeting";
  }> = {},
): string {
  const result = createMaterial(
    db,
    projectId,
    {
      associatedDate: overrides.associatedDate ?? "2024-01-15",
      description: overrides.description ?? "测试素材",
      materialType: overrides.materialType,
    },
    LOG,
  );
  if ("error" in result) throw new Error(result.error);
  return result.material.id;
}

function getMaterialRow(db: Database, materialId: string) {
  return wrap(db)
    .select()
    .from(materials)
    .where(and(eq(materials.id, materialId), notDeleted(materials)))
    .get();
}

function setMaterialStatus(
  db: Database,
  materialId: string,
  status: "approved" | "discarded" | "failed" | "pending" | "processing" | "review",
): void {
  db.prepare("UPDATE materials SET status = ?, updated_at = ? WHERE id = ?").run(
    status,
    new Date().toISOString(),
    materialId,
  );
}

class FailingProcessor extends MaterialProcessor {
  public attempts = 0;
  public failUntilAttempt = Number.POSITIVE_INFINITY;

  protected override async processOne(material: ProcessableMaterial): Promise<string> {
    this.attempts += 1;
    if (this.attempts <= this.failUntilAttempt) {
      throw new Error(`mock failure ${this.attempts}`);
    }
    return super.processOne(material);
  }
}

describe("素材处理器", () => {
  test("recoverStuckMaterials 将 processing 状态恢复为 pending", () => {
    withProcessorDb((db) => {
      const projectId = setupProject(db);
      const id1 = setupMaterial(db, projectId);
      const id2 = setupMaterial(db, projectId);

      setMaterialStatus(db, id1, "processing");
      setMaterialStatus(db, id2, "processing");

      const processor = new MaterialProcessor(db, LOG);
      const recovered = processor.recoverStuckMaterials();

      expect(recovered).toBe(2);
      expect(getMaterialRow(db, id1)?.status).toBe("pending");
      expect(getMaterialRow(db, id2)?.status).toBe("pending");
    });
  });

  test("recoverStuckMaterials 无 processing 素材时返回 0", () => {
    withProcessorDb((db) => {
      const projectId = setupProject(db);
      setupMaterial(db, projectId);

      const processor = new MaterialProcessor(db, LOG);
      const recovered = processor.recoverStuckMaterials();

      expect(recovered).toBe(0);
    });
  });

  test("processNext 将 pending 素材处理为 review 并写入 processedContent", async () => {
    await withProcessorDbAsync(async (db) => {
      const projectId = setupProject(db);
      const id = setupMaterial(db, projectId, { description: "测试内容" });

      const processor = new MaterialProcessor(db, LOG);
      await processor.processNext();

      const row = getMaterialRow(db, id);
      expect(row?.status).toBe("review");
      expect(row?.processedContent).toBe("测试内容");
    });
  });

  test("processNext 根据 materialType 选择模板", async () => {
    await withProcessorDbAsync(async (db) => {
      const projectId = setupProject(db);
      const id = setupMaterial(db, projectId, {
        description: "会议内容",
        materialType: "meeting",
      });

      const processor = new MaterialProcessor(db, LOG);
      await processor.processNext();

      const row = getMaterialRow(db, id);
      expect(row?.status).toBe("review");
      expect(row?.processedContent).toBe("会议内容");
    });
  });

  test("processNext 重试机制：前 2 次失败，第 3 次成功", async () => {
    await withProcessorDbAsync(async (db) => {
      const projectId = setupProject(db);
      const id = setupMaterial(db, projectId);

      const processor = new FailingProcessor(db, LOG);
      processor.failUntilAttempt = 2;

      await processor.processNext();

      expect(processor.attempts).toBe(3);
      const row = getMaterialRow(db, id);
      expect(row?.status).toBe("review");
      expect(row?.processedContent).not.toBeNull();
    });
  });

  test("processNext 3 次都失败后标记为 failed", async () => {
    await withProcessorDbAsync(async (db) => {
      const projectId = setupProject(db);
      const id = setupMaterial(db, projectId);

      const processor = new FailingProcessor(db, LOG);
      processor.failUntilAttempt = Number.POSITIVE_INFINITY;

      await processor.processNext();

      expect(processor.attempts).toBe(3);
      const row = getMaterialRow(db, id);
      expect(row?.status).toBe("failed");
      expect(row?.processedContent).toBeNull();
    });
  });

  test("空队列时不报错", async () => {
    await withProcessorDbAsync(async (db) => {
      setupProject(db);

      const processor = new MaterialProcessor(db, LOG);
      await processor.processNext();
    });
  });

  test("FIFO 顺序：先创建的先处理", async () => {
    await withProcessorDbAsync(async (db) => {
      const projectId = setupProject(db);

      const id1 = setupMaterial(db, projectId, { description: "第一个" });
      await new Promise((r) => setTimeout(r, 20));
      const id2 = setupMaterial(db, projectId, { description: "第二个" });

      const processor = new MaterialProcessor(db, LOG);
      await processor.processNext();

      expect(getMaterialRow(db, id1)?.status).toBe("review");
      expect(getMaterialRow(db, id2)?.status).toBe("pending");
    });
  });

  test("start 启动后能正常 stop", () => {
    withProcessorDb((db) => {
      const processor = new MaterialProcessor(db, LOG);
      processor.start(100);
      processor.stop();
    });
  });

  test("start 后定时器会推进 pending 素材到 review", async () => {
    await withProcessorDbAsync(async (db) => {
      const projectId = setupProject(db);
      const id = setupMaterial(db, projectId, { description: "定时扫描" });

      const processor = new MaterialProcessor(db, LOG);
      processor.start(50);

      await new Promise((r) => setTimeout(r, 300));

      processor.stop();

      const row = getMaterialRow(db, id);
      expect(row?.status).toBe("review");
      expect(row?.processedContent).toBe("定时扫描");
    });
  });
});

async function withProcessorDbAsync(callback: (db: Database) => Promise<void>): Promise<void> {
  const handle = createMigratedTestDatabase("processor-test-async");
  try {
    await callback(handle.db);
    handle.close();
  } finally {
    handle.cleanup();
  }
}