/**
 * Test helpers for integration tests.
 *
 * Each test gets a clean DB (tables truncated before the test), a mock
 * FeishuRuntime (sendText/sendCard are no-ops that record calls), and a mock
 * AI SDK model factory (doGenerate() returns canned responses - no network).
 */
import { PrismaClient } from "@prisma/client";
import type { FastifyBaseLogger } from "fastify";
import type {
  LanguageModelV4,
  LanguageModelV4CallOptions,
  LanguageModelV4Content,
  LanguageModelV4GenerateResult,
  LanguageModelV4StreamPart,
  LanguageModelV4StreamResult,
} from "@ai-sdk/provider";
import type { FeishuRuntime } from "../../src/feishu/client.js";
import type { ModelFactory } from "../../src/agent/runner.js";

export const TEST_DATABASE_URL = "postgresql://paradigm:paradigm@127.0.0.1:5432/cph_hub_test";

export const prisma = new PrismaClient({
  datasources: { db: { url: TEST_DATABASE_URL } },
});

/** Truncate all tables before each test for isolation. */
export async function resetDb(): Promise<void> {
  const tables = [
    "FeishuEventReceipt",
    "AgentFileChange",
    "AgentMessage",
    "AuditEntry",
    "PermissionSettings",
    "PermissionGrant",
    "RoleTriggerGrant",
    "ProjectAgentLock",
    "AgentRun",
    "AgentSession",
    "ProjectGroupBinding",
    "PlatformRoleAssignment",
    "User",
    "Project",
  ];
  // Truncate with CASCADE to wipe dependent rows in one shot.
  await prisma.$executeRawUnsafe(`TRUNCATE TABLE ${tables.map((t) => `"${t}"`).join(", ")} RESTART IDENTITY CASCADE`);
}

/** A logger that discards everything (tests don't need fastify's pino). */
export const silentLogger: FastifyBaseLogger = {
  info() {}, warn() {}, error() {}, debug() {}, fatal() {},
  child() { return this; },
  level: "silent",
} as unknown as FastifyBaseLogger;

/** Records sendText/sendCard calls so tests can assert on them. */
export interface MockFeishuRuntime extends FeishuRuntime {
  readonly sentTexts: string[];
  readonly sentCards: unknown[];
  readonly sentPatches: unknown[];
  readonly reactions: Array<{ readonly messageId: string; readonly emoji: string }>;
}

export function mockFeishuRuntime(): MockFeishuRuntime {
  const sentTexts: string[] = [];
  const sentCards: unknown[] = [];
  const sentPatches: unknown[] = [];
  const reactions: Array<{ messageId: string; emoji: string }> = [];
  // Mock the client — sendText/sendCard are in client.ts, not on the runtime
  // object directly. We patch by providing a runtime whose client is a stub;
  // the actual send functions cast through shape, so a minimal stub works.
  const rt: MockFeishuRuntime = {
    client: {
      request: async (p: unknown) => {
        const payload = p as { url?: string; data?: { reaction_type?: { emoji_type?: string } } };
        const match = payload.url?.match(/\/messages\/([^/]+)\/reactions$/);
        if (match?.[1] !== undefined) {
          reactions.push({
            messageId: match[1],
            emoji: payload.data?.reaction_type?.emoji_type ?? "",
          });
        }
        return {};
      },
      im: {
        v1: {
          message: {
            create: async (p: unknown) => {
              const payload = p as { data?: { msg_type?: string; content?: string } };
              if (payload.data?.msg_type === "interactive") {
                const card = payload.data.content ? JSON.parse(payload.data.content) : null;
                sentCards.push(card);
                const text = textFromCard(card);
                if (text !== null) sentTexts.push(text);
              } else {
                try {
                  const c = JSON.parse(payload.data?.content ?? "{}") as { text?: string };
                  sentTexts.push(c.text ?? payload.data?.content ?? "");
                } catch {
                  sentTexts.push(payload.data?.content ?? "");
                }
              }
              return { data: { message_id: "mock-msg-id" } };
            },
            patch: async (p: unknown) => {
              const payload = p as { data?: { content?: string } };
              const card = payload.data?.content ? JSON.parse(payload.data.content) : null;
              sentPatches.push(card);
              const text = textFromCard(card);
              if (text !== null) sentTexts.push(text);
              return {};
            },
          },
        },
      },
    } as unknown as FeishuRuntime["client"],
    logger: silentLogger,
    sentTexts,
    sentCards,
    sentPatches,
    reactions,
  };
  return rt;
}

function textFromCard(card: unknown): string | null {
  if (typeof card !== "object" || card === null) return null;
  const elements = (card as { elements?: unknown }).elements;
  if (!Array.isArray(elements)) return null;
  const parts: string[] = [];
  for (const element of elements) {
    if (typeof element !== "object" || element === null) continue;
    const text = (element as { text?: unknown }).text;
    if (typeof text !== "object" || text === null) continue;
    const content = (text as { content?: unknown }).content;
    if (typeof content === "string") parts.push(content);
  }
  return parts.length === 0 ? null : parts.join("\n");
}

export interface MockToolCall {
  readonly toolCallId: string;
  readonly toolName: string;
  readonly input: unknown;
}

export interface MockModelResponse {
  readonly text?: string;
  readonly toolCalls?: readonly MockToolCall[];
  readonly finishReason?: "stop" | "length" | "content-filter" | "tool-calls" | "error" | "other";
  readonly inputTokens?: number;
  readonly outputTokens?: number;
}

export class MockLanguageModel implements LanguageModelV4 {
  readonly specificationVersion = "v4";
  readonly provider = "mock";
  readonly supportedUrls: Record<string, RegExp[]> = {};
  readonly calls: LanguageModelV4CallOptions[] = [];

  constructor(
    readonly modelId: string,
    private readonly responses: readonly MockModelResponse[] = [{ text: "mock response" }],
  ) {}

  async doGenerate(options: LanguageModelV4CallOptions): Promise<LanguageModelV4GenerateResult> {
    this.calls.push(options);
    const configured = this.responses[this.calls.length - 1];
    const last = this.responses[this.responses.length - 1];
    const response =
      configured ??
      ((last?.toolCalls?.length ?? 0) > 0
        ? { text: "mock response" }
        : last ?? { text: "mock response" });
    const content: LanguageModelV4Content[] = [];
    if (response.text !== undefined) {
      content.push({ type: "text", text: response.text });
    }
    for (const call of response.toolCalls ?? []) {
      content.push({
        type: "tool-call",
        toolCallId: call.toolCallId,
        toolName: call.toolName,
        input: JSON.stringify(call.input),
      });
    }
    const finishReason = response.finishReason ?? ((response.toolCalls?.length ?? 0) > 0 ? "tool-calls" : "stop");
    return {
      content,
      finishReason: { unified: finishReason, raw: finishReason },
      usage: {
        inputTokens: { total: response.inputTokens ?? 10, noCache: undefined, cacheRead: undefined, cacheWrite: undefined },
        outputTokens: { total: response.outputTokens ?? 5, text: undefined, reasoning: undefined },
      },
      response: { id: `mock-${this.calls.length}`, timestamp: new Date(), modelId: this.modelId },
      warnings: [],
    };
  }

  async doStream(options: LanguageModelV4CallOptions): Promise<LanguageModelV4StreamResult> {
    this.calls.push(options);
    const response = this.responses[this.calls.length - 1 % this.responses.length] ?? this.responses[0]!;
    const text = response.text ?? "";
    const finishReason = response.finishReason ?? ((response.toolCalls?.length ?? 0) > 0 ? "tool-calls" : "stop");
    const id = `mock-${this.calls.length}`;

    const parts: LanguageModelV4StreamPart[] = [
      { type: "text-start", id },
    ];
    if (text.length > 0) {
      parts.push({ type: "text-delta", id, delta: text });
    }
    parts.push({ type: "text-end", id });
    for (const call of response.toolCalls ?? []) {
      const tcId = `tc-${this.calls.length}-${call.toolName}`;
      parts.push({ type: "tool-input-start", id: tcId, toolName: call.toolName });
      parts.push({ type: "tool-input-delta", id: tcId, delta: JSON.stringify(call.input) });
      parts.push({ type: "tool-input-end", id: tcId });
    }
    parts.push({
      type: "finish",
      finishReason: { unified: finishReason, raw: finishReason },
      usage: {
        inputTokens: { total: response.inputTokens ?? 10, noCache: undefined, cacheRead: undefined, cacheWrite: undefined },
        outputTokens: { total: response.outputTokens ?? 5, text: undefined, reasoning: undefined },
      },
    });

    return {
      stream: new ReadableStream({
        start(controller) {
          for (const part of parts) controller.enqueue(part);
          controller.close();
        },
      }),
      response: { id, timestamp: new Date(), modelId: "mock-model" },
    };
  }
}

export function createMockModelFactory(
  responses: readonly MockModelResponse[] = [{ text: "mock response" }],
): { readonly modelFactory: ModelFactory; readonly models: ReadonlyMap<string, MockLanguageModel> } {
  const models = new Map<string, MockLanguageModel>();
  return {
    models,
    modelFactory: (modelId) => {
      const model = new MockLanguageModel(modelId, responses);
      models.set(modelId, model);
      return model;
    },
  };
}

/** Create a project + binding + user + grant for a test. */
export async function seedProject(
  projectId: string,
  chatId: string,
  options: { principal?: string; role?: "READ" | "EDIT" | "MANAGE" } = {},
): Promise<void> {
  const principal = options.principal ?? "ou_test_user";
  const role = options.role ?? "EDIT";
  await prisma.project.create({
    data: {
      id: projectId,
      name: `Test ${projectId}`,
      workspaceDir: `/tmp/test-${projectId}`,
    },
  });
  await prisma.user.create({
    data: {
      id: "u_" + projectId,
      feishuOpenId: principal,
      displayName: "Test User",
      platformRoles: { create: { role: "TEACHER" } },
      permissionGrants: {
        create: {
          resourceType: "PROJECT",
          resourceId: projectId,
          principal,
          role,
        },
      },
    },
  });
  await prisma.projectGroupBinding.create({
    data: { projectId, chatId, createdByUserId: "u_" + projectId },
  });
}