'use strict';

// 先手动增加 audit_order、audit_type 字段。
// node db_script/bak/advance_audit_order.js uat [--tid=标段ID] [--vid=预付款ID] [--apply]
// 默认预览，--apply 写入；逐期逐轮按 order 排序、按人员去重回填。
const common = require('../../app/const/audit').auditType.key.common;

function buildUpdates(rows) {
    const sorted = rows.slice().sort((a, b) => a.order - b.order || a.id - b.id);
    const ids = [];
    sorted.forEach(row => { if (!ids.includes(row.audit_id)) ids.push(row.audit_id); });
    if (sorted.some(row => (row.audit_order > 0 && row.audit_order !== ids.indexOf(row.audit_id) + 1) ||
        (row.audit_type > 0 && row.audit_type !== common))) {
        return { skip: '已有节点序号或审批类型冲突，请人工核对' };
    }
    return { updates: sorted.filter(row => !(row.audit_order > 0) || !(row.audit_type > 0)).map(row => ({
        id: row.id, audit_id: row.audit_id,
        before: { audit_order: row.audit_order, audit_type: row.audit_type },
        audit_order: ids.indexOf(row.audit_id) + 1, audit_type: common,
    })) };
}

async function main() {
    const env = process.argv[2];
    if (!['local', 'uat', 'default'].includes(env)) throw new Error('环境仅支持 local / uat / default');
    const filters = {};
    let apply = false;
    for (const arg of process.argv.slice(3)) {
        if (arg === '--apply') { apply = true; continue; }
        const match = /^--(vid|tid)=(\d+)$/.exec(arg);
        if (!match || !Number.isSafeInteger(Number(match[2])) || Number(match[2]) <= 0) throw new Error('无效参数：' + arg);
        filters[match[1]] = Number(match[2]);
    }
    const mysql = require('mysql');
    // 使用与 baseUtils 相同的配置入口，独立连接确保每轮更新处于同一事务。
    const path = require('path');
    const root = path.resolve(__dirname, '../..');
    const config = require(path.join(root, 'config/config.' + env))({ baseDir: root, root, name: 'calc' });
    const connection = mysql.createConnection(config.mysql.client);
    const query = (sql, params = []) => new Promise((resolve, reject) => {
        connection.query(sql, params, (err, rows) => err ? reject(err) : resolve(rows));
    });
    const log = data => {
        console.log(JSON.stringify(data));
    };
    try {
        const columns = await query('SHOW COLUMNS FROM zh_advance_audit');
        if (!['audit_order', 'audit_type'].every(name => columns.some(x => x.Field === name))) {
            throw new Error('请先为 zh_advance_audit 增加 audit_order 和 audit_type 字段');
        }
        log({ env, apply, filters });
        const where = ['1 = 1'], params = [];
        for (const key of ['tid', 'vid']) {
            if (filters[key]) { where.push(key + ' = ?'); params.push(filters[key]); }
        }
        const rounds = await query('SELECT DISTINCT tid, vid, times FROM zh_advance_audit WHERE ' + where.join(' AND ') + ' ORDER BY tid, vid, times', params);
        let updated = 0;
        for (const round of rounds) {
            await query('START TRANSACTION');
            try {
                const rows = await query('SELECT id, audit_id, `order`, audit_order, audit_type FROM zh_advance_audit WHERE tid = ? AND vid = ? AND times = ? ORDER BY `order`, id FOR UPDATE', [round.tid, round.vid, round.times]);
                const plan = buildUpdates(rows);
                log({ phase: 'plan', ...round, ...plan });
                if (!apply || plan.skip) { await query('ROLLBACK'); continue; }
                for (const row of plan.updates) {
                    const result = await query('UPDATE zh_advance_audit SET audit_order = ?, audit_type = ? WHERE id = ?', [row.audit_order, row.audit_type, row.id]);
                    if (result.affectedRows !== 1) throw new Error('回填失败：' + row.id);
                }
                await query('COMMIT');
                updated += plan.updates.length;
                log({ phase: 'committed', ...round, updated: plan.updates.length });
            } catch (err) {
                await query('ROLLBACK');
                throw err;
            }
        }
        log({ phase: 'done', rounds: rounds.length, updated });
    } finally {
        connection.end();
    }
}

module.exports = { buildUpdates };
if (require.main === module) main().catch(err => { console.error(err); process.exitCode = 1; });