import { createRequire } from 'module';
import fs from 'fs';
import path from 'path';
import { fileURLToPath } from 'url';
import PocketBase from 'pocketbase';

const require = createRequire(import.meta.url);
const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

let runtimeConfig = {};
try {
    runtimeConfig = require('../pocket-base/bai_api_pb_hooks/bai_api_shared/config/runtime.js');
} catch (_error) {
    runtimeConfig = {};
}

function readEnvFile(filePath) {
    if (!fs.existsSync(filePath)) return {};

    const content = fs.readFileSync(filePath, 'utf8');
    const result = {};

    for (const rawLine of content.split(/\r?\n/)) {
        const line = rawLine.trim();
        if (!line || line.startsWith('#')) continue;

        const index = line.indexOf('=');
        if (index === -1) continue;

        const key = line.slice(0, index).trim();
        const value = line.slice(index + 1).trim();
        result[key] = value;
    }

    return result;
}

const backendEnv = readEnvFile(path.resolve(__dirname, '..', 'back-end', '.env'));
const PB_URL = String(
    process.env.PB_URL
    || backendEnv.POCKETBASE_API_URL
    || runtimeConfig.POCKETBASE_API_URL
    || 'http://127.0.0.1:8090'
).replace(/\/+$/, '');
const AUTH_TOKEN = process.env.POCKETBASE_AUTH_TOKEN || runtimeConfig.POCKETBASE_AUTH_TOKEN || '';

if (!AUTH_TOKEN) {
    console.error('❌ 缺少 POCKETBASE_AUTH_TOKEN，无法执行 cart/order 业务 ID 自动生成迁移。');
    process.exit(1);
}

const pb = new PocketBase(PB_URL);

const TARGETS = [
    {
        collectionName: 'tbl_cart',
        fieldName: 'cart_id',
        autogeneratePattern: 'CART-[0-9]{13}-[A-Za-z0-9]{6}',
    },
    {
        collectionName: 'tbl_order',
        fieldName: 'order_id',
        autogeneratePattern: 'ORDER-[0-9]{13}-[A-Za-z0-9]{6}',
    },
];

function normalizeFieldPayload(field, overrides) {
    const payload = Object.assign({}, field, overrides || {});

    if (payload.type === 'number') {
        if (Object.prototype.hasOwnProperty.call(payload, 'onlyInt')) payload.onlyInt = !!payload.onlyInt;
    }

    if (payload.type === 'autodate') {
        payload.onCreate = typeof payload.onCreate === 'boolean' ? payload.onCreate : true;
        payload.onUpdate = typeof payload.onUpdate === 'boolean' ? payload.onUpdate : false;
    }

    if (payload.type === 'file') {
        payload.maxSelect = typeof payload.maxSelect === 'number' ? payload.maxSelect : 0;
        payload.maxSize = typeof payload.maxSize === 'number' ? payload.maxSize : 0;
        payload.mimeTypes = Array.isArray(payload.mimeTypes) ? payload.mimeTypes : null;
    }

    return payload;
}

function buildCollectionPayload(collection, fields) {
    return {
        name: collection.name,
        type: collection.type,
        listRule: collection.listRule,
        viewRule: collection.viewRule,
        createRule: collection.createRule,
        updateRule: collection.updateRule,
        deleteRule: collection.deleteRule,
        fields,
        indexes: collection.indexes || [],
    };
}

async function ensureAutoGenerateField(target) {
    const collection = await pb.collections.getOne(target.collectionName);
    const fields = Array.isArray(collection.fields) ? collection.fields : [];
    const existingField = fields.find((field) => field && field.name === target.fieldName);

    if (!existingField) {
        throw new Error(`${target.collectionName}.${target.fieldName} 不存在`);
    }

    const currentPattern = String(existingField.autogeneratePattern || '');
    if (existingField.type === 'text' && currentPattern === target.autogeneratePattern) {
        return {
            collectionName: target.collectionName,
            fieldName: target.fieldName,
            action: 'skipped',
            autogeneratePattern: currentPattern,
        };
    }

    const nextFields = fields
        .filter((field) => field && field.name !== 'id')
        .map((field) => {
            if (field.name !== target.fieldName) {
                return normalizeFieldPayload(field);
            }

            return normalizeFieldPayload(field, {
                type: 'text',
                required: true,
                autogeneratePattern: target.autogeneratePattern,
            });
        });

    await pb.collections.update(collection.id, buildCollectionPayload(collection, nextFields));

    return {
        collectionName: target.collectionName,
        fieldName: target.fieldName,
        action: 'updated',
        autogeneratePattern: target.autogeneratePattern,
    };
}

async function verifyTargets() {
    const result = [];

    for (const target of TARGETS) {
        const collection = await pb.collections.getOne(target.collectionName);
        const field = (collection.fields || []).find((item) => item && item.name === target.fieldName);
        const pattern = String(field && field.autogeneratePattern || '');
        const ok = !!field && field.type === 'text' && pattern === target.autogeneratePattern;

        result.push({
            collectionName: target.collectionName,
            fieldName: target.fieldName,
            type: field ? field.type : '',
            required: !!(field && field.required),
            autogeneratePattern: pattern,
            ok,
        });
    }

    const failed = result.filter((item) => !item.ok);
    if (failed.length) {
        throw new Error(`以下字段未正确启用自动生成: ${JSON.stringify(failed, null, 2)}`);
    }

    return result;
}

async function main() {
    try {
        console.log(`🔄 正在连接 PocketBase: ${PB_URL}`);
        pb.authStore.save(AUTH_TOKEN, null);
        console.log('✅ 已使用 POCKETBASE_AUTH_TOKEN 载入认证状态。');

        const changed = [];
        for (const target of TARGETS) {
            changed.push(await ensureAutoGenerateField(target));
        }

        console.log('📝 业务 ID 自动生成处理结果：');
        console.log(JSON.stringify(changed, null, 2));

        const verified = await verifyTargets();
        console.log('📝 校验结果：');
        console.log(JSON.stringify(verified, null, 2));

        console.log('🎉 cart_id / order_id 自动生成规则已就绪。');
    } catch (error) {
        console.error('❌ cart/order 业务 ID 自动生成迁移失败:', error.response?.data || error.message || error);
        process.exitCode = 1;
    }
}

main();