const fs = require('fs')
const _mappings = () => {
    const models = ['save']
    for(const model of models) {
        _mapping(model)
    }
}

const _mapping = modelName => {
    const json = `json/${modelName}.json`
    const sql  = `sql/${modelName}.sql`

    const modelObj = _getModelObj(json)
    const sqls = []
    _conver(sqls, modelObj, '')
    saveSql(sql, sqls)
    console.log(sqls)
}

const _getModelObj = uri => {
    const data = fs.readFileSync(uri)
    return JSON.parse(data)
}

const _conver = (sqls, obj, pKey) => {
    const sql = []
    for(const key in obj) {
        // 内置字段
        if(key.startsWith('_') && typeof obj[key] !== 'object') {
            continue
        }

        if(obj[key] instanceof Array) {
            sqls.push({
                key, pKey, type: 'Array'
            })
            for(const item of obj[key]) {
                sqls.push({
                    key: key + '-object', pKey: key, type: 'object'
                })
                _conver(sqls,item, key + '-object')
            }
            continue
        }

        if(typeof obj[key]  === 'object') {
            sqls.push({
                key, pKey, type: 'object'
            })
            _conver(sqls, obj[key], key)
            continue
        }
        sqls.push({
            key, pKey, type: 'element', name: obj[key], 
        })
    }
}

const saveSql = (uri, sqls) => {
    let sql = `insert into mapping(key, pKey, type, name) values `
    sql += sqls.map(item => {
        return `("${item.key}","${item.pKey}","${item.type}","${item.name || ''}")`
    }).join(',')
    sql += ';'
    fs.writeFileSync(uri, sql)
}
_mappings()