import { mkdir, readFile, writeFile } from 'node:fs/promises';
import { homedir } from 'node:os';
import { join } from 'node:path';
import { existsSync } from 'node:fs';
import { getAllSettings, setSetting } from './store';
import { getOpenClawConfigDir, reinstallManagedOpenClawRuntime } from './paths';
import { logger } from './logger';

type JsonObject = Record<string, unknown>;

export type YinianInitializationStepStatus = 'pending' | 'running' | 'success' | 'error';

export interface YinianInitializationStep {
  id: 'runtime' | 'workspace' | 'model' | 'python';
  label: string;
  status: YinianInitializationStepStatus;
  message?: string;
}

export interface YinianInitializationStatus {
  initialized: boolean;
  initializedAt?: number;
  openclawDir?: string;
  model?: string;
  steps: YinianInitializationStep[];
}

const INTERNAL_PROVIDER_KEY = 'minimax';
const INTERNAL_MODEL_ID = 'MiniMax-M2.7';
const INTERNAL_MODEL_REF = `${INTERNAL_PROVIDER_KEY}/${INTERNAL_MODEL_ID}`;
let initializationInFlight: Promise<YinianInitializationStatus> | null = null;

const DEFAULT_STEPS: YinianInitializationStep[] = [
  { id: 'runtime', label: '安装运行环境', status: 'pending' },
  { id: 'workspace', label: '准备本地工作区', status: 'pending' },
  { id: 'model', label: '写入内测模型配置', status: 'pending' },
  { id: 'python', label: '准备文档处理环境', status: 'pending' },
];

export async function getYinianInitializationStatus(): Promise<YinianInitializationStatus> {
  const settings = await getAllSettings();
  const initialized = settings.setupComplete === true;
  return {
    initialized,
    initializedAt: settings.openclawInitializedAt,
    openclawDir: initialized ? join(getOpenClawConfigDir(), 'runtime', 'openclaw') : undefined,
    model: initialized ? INTERNAL_MODEL_REF : undefined,
    steps: DEFAULT_STEPS.map((step) => ({
      ...step,
      status: initialized ? 'success' : 'pending',
      message: initialized ? '已完成' : undefined,
    })),
  };
}

export async function initializeYinianRuntime(): Promise<YinianInitializationStatus> {
  if (initializationInFlight) return initializationInFlight;
  initializationInFlight = runYinianRuntimeInitialization();
  try {
    return await initializationInFlight;
  } finally {
    initializationInFlight = null;
  }
}

async function runYinianRuntimeInitialization(): Promise<YinianInitializationStatus> {
  const steps = DEFAULT_STEPS.map((step) => ({ ...step }));

  const setStep = (
    id: YinianInitializationStep['id'],
    status: YinianInitializationStepStatus,
    message?: string,
  ) => {
    const step = steps.find((item) => item.id === id);
    if (step) {
      step.status = status;
      step.message = message;
    }
  };

  try {
    setStep('runtime', 'running', '正在重装内置运行环境');
    const runtime = reinstallManagedOpenClawRuntime();
    if (runtime.source === 'missing') {
      throw new Error('内置 OpenClaw 运行环境不可用');
    }
    setStep('runtime', 'success', runtime.dir);

    setStep('workspace', 'running', '正在创建本地工作区');
    await ensureWorkspaceFiles();
    setStep('workspace', 'success', '本地工作区已准备');

    setStep('model', 'running', '正在写入内测模型配置');
    await seedInternalModelConfig();
    setStep('model', 'success', INTERNAL_MODEL_REF);

    setStep('python', 'running', '正在准备文档处理环境');
    await ensureAuxiliaryRuntimeMarkers();
    setStep('python', 'success', '文档处理环境已准备');

    const initializedAt = Date.now();
    await setSetting('setupComplete', true);
    await setSetting('openclawInitializedAt', initializedAt);

    logger.info('[yinian-init] First-run initialization completed', {
      openclawDir: runtime.dir,
      model: INTERNAL_MODEL_REF,
    });

    return {
      initialized: true,
      initializedAt,
      openclawDir: runtime.dir,
      model: INTERNAL_MODEL_REF,
      steps,
    };
  } catch (error) {
    const running = steps.find((step) => step.status === 'running');
    if (running) {
      running.status = 'error';
      running.message = error instanceof Error ? error.message : String(error);
    }
    logger.error('[yinian-init] First-run initialization failed', error);
    return {
      initialized: false,
      steps,
    };
  }
}

async function ensureWorkspaceFiles(): Promise<void> {
  const openclawDir = getOpenClawConfigDir();
  const workspaceDir = join(openclawDir, 'workspace');
  await mkdir(workspaceDir, { recursive: true });
  await mkdir(join(openclawDir, 'agents', 'main', 'agent'), { recursive: true });
}

async function seedInternalModelConfig(): Promise<void> {
  const configDir = getOpenClawConfigDir();
  const configPath = join(configDir, 'openclaw.json');
  await mkdir(configDir, { recursive: true });

  const config = await readJsonFile(configPath);
  const models = asObject(config.models);
  const providers = asObject(models.providers);
  providers[INTERNAL_PROVIDER_KEY] = {
    baseUrl: 'https://api.minimaxi.com/anthropic',
    api: 'anthropic-messages',
    authHeader: true,
    models: [
      {
        id: INTERNAL_MODEL_ID,
        name: 'MiniMax M2.7',
        reasoning: true,
        input: ['text', 'image'],
        contextWindow: 204800,
        maxTokens: 131072,
      },
    ],
  };
  models.mode = 'merge';
  models.providers = providers;
  config.models = models;

  const agents = asObject(config.agents);
  const defaults = asObject(agents.defaults);
  defaults.model = {
    primary: INTERNAL_MODEL_REF,
    fallbacks: ['minimax/MiniMax-M2.5'],
  };
  defaults.workspace = join(homedir(), '.openclaw', 'workspace');
  agents.defaults = defaults;
  if (!Array.isArray(agents.list)) {
    agents.list = [
      {
        id: 'main',
        name: '智念助手',
        default: true,
        workspace: join(homedir(), '.openclaw', 'workspace'),
        agentDir: '~/.openclaw/agents/main/agent',
      },
    ];
  }
  config.agents = agents;

  await writeFile(configPath, `${JSON.stringify(config, null, 2)}\n`, 'utf8');
}

async function ensureAuxiliaryRuntimeMarkers(): Promise<void> {
  const dir = join(getOpenClawConfigDir(), 'runtime');
  await mkdir(dir, { recursive: true });
  await writeFile(join(dir, 'yinian-initialized.json'), JSON.stringify({
    initializedAt: Date.now(),
    documentRuntime: 'bundled',
  }, null, 2), 'utf8');
}

async function readJsonFile(filePath: string): Promise<JsonObject> {
  if (!existsSync(filePath)) return {};
  try {
    const raw = await readFile(filePath, 'utf8');
    const parsed = JSON.parse(raw) as unknown;
    return asObject(parsed);
  } catch {
    return {};
  }
}

function asObject(value: unknown): JsonObject {
  return typeof value === 'object' && value !== null && !Array.isArray(value)
    ? value as JsonObject
    : {};
}