const glob = require("glob");
const path = require("path");
const fs = require("fs-extra");
const dayjs = require("dayjs");
const axios = require("axios");
const conf = require(`${process.env.dirtown}/conf.json`);
const Checkjson = require(`./Checkjson.js`);

/**
 * This manage Objects for indexing, searching, checking and act to CRUD
 * @objectPathName = objectpath/objectname 
 *    objectpath/objectname/conf.json
 *                         /idx/all_key1.json = {key1value:{object}}
 *                              lst_key1.json = [key1valA,key1val2,...]
 *                              key2_key1.json = {key2value:[key1value]}
 *                              all_key1_filtername = {key1value:{object}} 
 *                         /itm/apxidvalue.json
 * in conf.json:
 * {
 *   "name": "object name ex:'nations'",
 *   "schema": "relativ schema from dirapi dirtown ex:'adminapi/schema/nations.json'"",
 *   "lastupdateschema": 0, time stamp last schema update
 *   "lastupdatedata":0 time stamp last itm update
 * }
 * 
 * Specifics key in schema to apXtrib:
 * apxid : the field value to use to store item 
 * apxuniquekey : list of field that has to be unique you cannot have 2 itm with same key value
 * apxidx : list of index file /idx/
 *  { "name":"lst_fieldA", "keyval": "alias" }, => lst_fieldA.json = [fieldAvalue1,...]
    { "name":"all_fieldA", "keyval": "fieldA" }, => all_fieldA.json = 
        if fieldA in apxuniquekey   = {fieldAvalue1:{object}}
                not in apxuniquekey = {fieldAvalue1:[{object}]}
    { "name":"word_fieldA", "keyval": "fieldA", "objkey": ["fieldB"]}, => word_fieldA.json
         if fieldA in apxuniquekey  = {fieldAvalue1:fieldBvalue,}
         if fieldA not in uniquekey = {fieldAvalue1: [fieldBv1,fieldBv2,]}
    { "name":"word_fieldA", "keyval": "fieldA", "objkey": ["fieldB","fieldC"]}, => word_fieldA.json
         if fieldA in apxuniquekey  = {fieldAvalue1:{fieldB:val,fieldC:val},}
         if fieldA not in uniquekey = {fieldAvalue1: [{fieldB:val,fieldC:val},]}
 * apxaccessrights : list of profil with CRUD accesrights

         
         
 **/

const Odmdb = {};

/**
 * @api syncObject
 * @param {string} url to an existing object conf (/objectname/conf.json)
 * @param {timestamp} timestamp
 *                     0  => rebuild local object from all_{idapx}.json
 *                    >0 => update itm and idx search by datetime
 * @param
 */
Odmdb.syncObject = () => {};

/**
 * @api createObject: create a space to host object
 *
 * @source {string} "new", url,
 * @schemapath {string} path to create or replace a schema ${schemaPath}/schema/
 * @objectPath {string} path where object are store
 * @objectName {string} name of the object
 * @schema     {object} the json schema for this object
 * @lgjson     {object} the json file for a specific language
 * @lg         {string} the 2 letters language
 *
 * Setup a new object localy =>
 *   source
 *
 *  - from scratch =>
 *      Create
 *  - from a synchronization
 *      Download  from source all_{apxid}.json
 *
 *
 */
Odmdb.createObject = (
  source,
  schemaPath,
  objectPath,
  objectName,
  schema,
  lgjson,
  lg
) => {
  if (!fs.existsSync(schemaPath)) {
    return {
      status: 404,
      ref: "Odmdb",
      info: "pathnamedoesnotexist",
      moreinfo: { fullpath: schemaPath },
    };
  }
  if (!fs.existsSync(objectPath)) {
    return {
      status: 404,
      ref: "Odmdb",
      info: "pathnamedoesnotexist",
      moreinfo: { fullpath: objectPath },
    };
  }
  // store schema file if not empty undefined or {}
  if (
    schema &&
    !(Object.keys(schema).length === 0 && schema.constructor === Object)
  ) {
    fs.outputJSONSync(`${schemaPath}/schema/${objectName}.json`, schema, {
      spaces: 2,
    });
  }
  if (
    lgjson &&
    lg &&
    !(Object.keys(lgjson).length === 0 && lgjson.constructor === Object)
  ) {
    fs.outputJSONSync(`${schemaPath}/lg/${objectName}_${lg}.json`, lgjson, {
      spaces: 2,
    });
  }
  //create environnement object with the new schema config
  if (!fs.existsSync(`${objectPath}/${objectName}`)) {
    fs.outputJsonSync(
      `${objectPath}/${objectName}/idx/confjson`,
      { schema: `${schemaPath}/schema/${objectName}.json` },
      { spaces: 2 }
    );
  }
  return { status: 200 };
};

/**
 * Update an object
 *  @param {string} objectPathname
 *  @param {object} meta update request
 *                  lg:
 *                  lgobj: object to store in /lg/objectname_lg.json
 *                  schema: an update schema
 * @return {status, ref:"Odmdb", msg:"", data}
 *
 * Create a tmp object env and check existing object to identify any issues
 * If all is fine then apply change by replacing
 */
Odmdb.updateObject = (objectPathname, meta) => {};

/**
 * Get a schema from objectPathname
 *
 * todo only local schema => plan a sync each 10minutes
 * @schemaPath local path adminapi/schema/objectName.json or /tribename/schema/objectName
 * @validschema boolean if necessary to check schema or not mainly use when change schema
 * @return {status:200,data:{conf:"schemaconf",schema:"schemacontent"} }
 */
Odmdb.Schema = (objectPathname, validschema) => {
  const confschema = fs.readJsonSync(`${objectPathname}/conf.json`);
  let schemaPath = confschema.schema;
  const res = {
    status: 200,
    ref: "Odmdb",
    msg: "getschema",
    data: { conf: confschema },
  };
  if (schemaPath.slice(-5) != ".json") schemaPath += ".json";
  if (schemaPath.substring(0, 4) == "http") {
    // lance requete http pour recuperer le schema avec un await axios
  } else {
    if (schemaPath.substring(0, 9) == "adminapi/") {
      schemaPath = `${conf.dirapi}/${schemaPath}`;
    } else {
      schemaPath = `${conf.dirtown}/tribes/${schemaPath}`;
    }
    if (!fs.existsSync(schemaPath)) {
      return {
        status: 404,
        ref: "Odmdb",
        msg: "schemanotfound",
        data: { schemaPath, schema: {} },
      };
    }
    res.data.schema = fs.readJsonSync(schemaPath);
    if (!res.data.schema.apxid) {
      return {
        status: 406,
        ref: "Odmdb",
        msg: "missingprimarykey",
        data: {},
      };
    }
    if (res.data.schema.apxidx) {
      //add apxidx to apxuniquekey in case not
      if (!res.data.schema.apxuniquekey.includes(res.data.schema.apxid)) {
        res.data.schema.apxuniquekey.push(res.data.schema.apxid);
      }
      res.data.schema.apxidx.forEach((idx) => {
        if (
          idx.objkey &&
          !res.data.schema.apxuniquekey.includes(idx.keyval) &&
          !idx.objkey.includes(res.data.schema.apxid)
        ) {
          return {
            status: 406,
            ref: "Odmdb",
            msg: "unconsistencyapxidx",
            data: {
              name: idx.name,
              keyval: idx.keyval,
              objkey: idx.objkey,
              apxid: res.data.schema.apxid,
            },
          };
        }
      });
    }
    if (validschema || 1 == 1) {
      // return {status:200, ref, msg} or {status!:200,multimsg:[{ref,msg;data}]}
      const check = Checkjson.schema.validation(res.data.schema);
      if (check.status != 200) {
        res.multimsg = check.multimsg;
        res.status = check.status;
      }
    }
  }
  return res;
};
Odmdb.search = (objectPath, objectName, search) => {
  /*
  @search= {
    txt: string,
    algo: match | pattern | fuzzy
    fieldstring:[list of field],
    indexfilter:{index1:[val1,val2 | ] }
  }
  Return data:[uuids]

  example: search exact match hill in townId
   heavy search={txt:"hill",algo:"match",fieldstring:"toxnId"}
   light search={txt:"hill", algo:"match", indexfilter:{"key":"townId","value":[]}}
   light search={txt:"hill", algo:"match", indexfilter:{"key":"nationId","value":"ants"}}

   */
  const schema = Odmdb.schema(objectPath, objectName);
  if (schema.status != 200) return schema;
};

/**
 * To get an array of item (itm) per primarykey with a list of field
 * Object are store in objectPath/objectName/conf.json contain
 *
 *  @objectPathname where object are store (where /object/conf.json indicate where the schema is)
 *  @uuidprimarykeyList list of uuid requested
 *  @role {xalias,xprofiles} allow to get accessright come from header
 *  @propertiesfilter (optionnal) key to return for each object (if undefined then return all)
 *  @Return {status:200; data:{uuid:{data filter by @propertiesfilter},uuid:"notfound"}}
 */
Odmdb.reads = (objectPathname, apxidlist, role, propertiesfilter) => {
  const res = { status: 200, data: {} };
  const getschema = Odmdb.Schema(objectPathname, true);
  if (getschema.status != 200) return getschema;
  // Test if readable at least if owner
  role.xprofils.push("owner");
  const accessright = (Odmdb.accessright =
    (getschema.data.schema.apxaccessright, role.xprofils));
  if (!accessright.R) {
    return {
      status: 403,
      ref: "Odmdb",
      msg: "accessforbidden",
      data: { crud: "R", accessright },
    };
  }
  apxidlist.forEach((id) => {
    if (fs.existsSync(`${objectPathname}/itm/${id}.json`)) {
      const objectdata = fs.readJsonSync(`${objectPathname}/itm/${id}.json`);
      if (objectdata.owner && objectdata.owner == role.xalias) {
        if (!role.xprofils.includes("owner")) role.xprofils.push("owner");
      } else {
        if (role.xprofils.includes("owner"))
          role.xprofils = role.xprofils.filter((e) => e !== "owner");
      }
      const accessright = Odmdb.accessright(
        getschema.data.schema.apxaccessright,
        role
      );
      if (!accessright.R) {
        res.data[id] = "forbiden";
      } else {
        let newpropertiesfilter = Object.keys(objectdata);
        if (accessright.R.length > 0) {
          const setaccess = new Set(accessright.R);
          if (!propertiesfilter) propertiesfilter = Object.keys(objectdata);
          newpropertiesfilter = propertiesfilter.filter((f) =>
            setaccess.has(f)
          );
        }
        const objinfo = {};
        newpropertiesfilter.forEach((k) => {
          if (objectdata[k]) objinfo[k] = objectdata[k];
        });
        res.data[id] = objinfo;
      }
    } else {
      res.data[id] = "notfound";
    }
  });
  return res;
};
/**
 * Convert profils in accessright
 * @param {*} apxaccessright from schema object {profilname:{R}}
 * @param {*} role {xprofils,xalias} accessible after isAuthenticated
 * @returns access right  to C create if present, to read (properties list or all if empty), to Update properties list or all if empty, D elete
 * example: {"C":[],"R":[properties list],"U":[properties ist],"D":[]}
 */
Odmdb.accessright = (apxaccessrights, role) => {
  const accessright = {};
  role.xprofils.forEach((p) => {
    if (apxaccessrights[p]) {
      Object.keys(apxaccessrights[p]).forEach((act) => {
        if (!accessright[act]) {
          accessright[act] = apxaccessrights[p][act];
        } else {
          accessright[act] = [
            ...new Set([...accessright[act], ...apxaccessrights[p][act]]),
          ];
        }
      });
    }
  });
  return accessright;
};
/**
 * CUD a data itm into objectPathname if checkJson is valid
 *  and update idx
 *  idx is upto date for unique properties but not for list
 * @param {string} objectpathname folder name where object are stored
 * @param {object}  itm an object respecting the checkJson schema in objectPathname/conf.json
 * @param {string} crud: C reate U pdate D elete
 * @param {array} role {xprofils,xalias} xprofils list of profils like anonymous,pagans, person owner is deuce if object properties owner is alias

 *  */

Odmdb.cud = (objectPathname, crud, itm, role) => {
  const getschema = Odmdb.Schema(objectPathname, true);
  if (getschema.status != 200) return getschema;

  if (!itm[getschema.data.schema.apxid]) {
    return {
      status: 406,
      ref: "Odmdb",
      msg: "apxidmissing",
      data: { missingkey: getschema.data.schema.apxid },
    };
  }
  const pathindex=`${objectPathname}/idx/lst_${getschema.data.schema.apxid}.json`;
  if (!fs.existsSync(pathindex)){
    fs.outputJSONSync(pathindex,[])
    fs.ensureDirSync(`${objectPathname}/itm/`);
  }
  const existid = fs
    .readJSONSync(pathindex)
    .includes(itm[getschema.data.schema.apxid]);
  if (existid && crud == "C") {
    return {
      status: 406,
      ref: "Odmdb",
      msg: "alreadyexist",
      data: {
        objectname: path.basename(objectPathname),
        key: getschema.data.schema.apxid,
        val: itm[getschema.data.schema.apxid],
      },
    };
  }
  if (!existid && ["U", "D"].includes(crud)) {
    return {
      status: 406,
      ref: "Odmdb",
      msg: "doesnotexist",
      data: {
        objectname: path.basename(objectPathname),
        key: getschema.data.schema.apxid,
        val: itm[getschema.data.schema.apxid],
      },
    };
  }
  const itmold = existid
    ? fs.readJSONSync(
        `${objectPathname}/itm/${itm[getschema.data.schema.apxid]}.json`
      )
    : {};
  if (existid && itmold.owner && itmold.owner == role.xalias) {
    role.xprofils.push("owner");
  } else {
    // set owner cause this is a Create
    itm.owner = role.xalias;
  }
  //get accessright {C:[],R:[],U:[],D:[]} if exist means authorize, if array contain properties (for R and U) right is only allowed on properties
  const accessright = Odmdb.accessright(
    getschema.data.schema.apxaccessrights,
    role
  );
  console.log("accessright", accessright);
  if (
    (crud == "C" && !accessright.C) ||
    (crud == "D" && !accessright.D) ||
    (crud == "U" && !accessright.U)
  ) {
    return {
      status: 403,
      ref: "Odmdb",
      msg: "accessforbidden",
      data: { crud, accessright },
    };
  }
  //delete or save
  if (crud == "D") {
    itmold["dt_delete"] = dayjs();
    fs.outputJSONSync(
      `${objectPathname}/delitm/${itmold[getschema.data.schema.apxid]}.json`,
      itmold
    );
    fs.rmSync(
      `${objectPathname}/itm/${itmold[getschema.data.schema.apxid]}.json`
    );
  } else {
    // if Create Update erase old version
    let itmtostore = itm;
    if (crud == "U" && accessright.U.length > 0) {
      itmtostore = itmold;
      accessright.U.forEach((p) => {
        itmtostore[p] = itm[p];
      });
      itmtostore.dt_update = dayjs();
    }
    if (crud == "C") itmtostore.dt_create = dayjs();
    // check consistency of datatostore
    const chkdata = Checkjson.schema.data(
      getschema.data.schema,
      itmtostore,
      false
    );
    if (chkdata.status != 200) return chkdata;
    if (!getschema.data.schema.apxuniquekey)
      getschema.data.schema.apxuniquekey = [];

    fs.outputJSONSync(
      `${objectPathname}/itm/${chkdata.data.apxid}.json`,
      chkdata.data.itm
    );
  }
  console.log("getschema", getschema);
  //update idx
  Odmdb.idxfromitm(
    objectPathname,
    crud,
    itm,
    itmold,
    [],
    getschema.data.schema
  );
  getschema.data.conf.lastupdatedata = dayjs();
  fs.outputJSONSync(`${objectPathname}/conf.json`, getschema.data.conf);
  return {
    status: 200,
    ref: "Odmdb",
    msg: "cudsuccessfull",
    data: { itm: chkdata.data.itm },
  };
};
/**
 * create/update idx from itm(s)
 *
 * @param {string} objectPathname
 * @param {object} itm  item to Create or to Update or {} if crud == I or crud == D
 * @param {object} itmold (current item) if crud == U or D to get previous itm before change or {} if crud==I or C
 * @param {letter} crud CUDI C add, U update, D delete I reindex
 * @param {array} idx if specific request to rebuild list of idx only if [] then use schema one
 * @param {object} schema if empty it use schema from Odmdb.Schema().data.schema
 *
 * example create alias 12 name fred:
 * Odmdb.idxfromitm('.../tribes/ndda/persons',"C",{alias:'12',name:"fred"},{},[], {person schema})
 * example update alias 12 in name freddy:
 * Odmdb.idxfromitm('.../tribes/ndda/persons',"U",{alias:'12',name:"freddy"},{alias:'12',name:"fred"},[], {person schema})
 * example delete alias 12:
 * Odmdb.idxfromitm('.../tribes/ndda/persons',"D",{},{alias:'12',name:"fred"},[], {person schema})
 * example to rebuild all index from scratch
 * Odmdb.idxfromitm('.../tribes/ndda/persons',"I",{},{},[], {person schema})
 * example to rebuild only publickey_alias index from scratch
 * Odmdb.idxfromitm('.../tribes/ndda/pagans',"I",{},{},[{ name:"publickey_alias",keyval:"publickey",objkey:["alias"]}], {pagans schema})
 *
 */
Odmdb.idxfromitm = (objectPathname, crud, itm, itmold, idxs = [], schema) => {
  console.log(`idxfromitem for ${objectPathname} action:${crud}`);
  if (!schema || !schema.apxid) {
    const getschema = Odmdb.Schema(objectPathname, true);
    if (getschema.status != 200) return getschema;
    schema = getschema.data.schema;
  }
  console.log(schema.apxuniquekey);
  const itms = crud == "I" ? glob.sync(`${objectPathname}/itm/*.json`) : [itm];
  console.log(itms);
  if (crud == "I") {
    //reinit all idx
    idxs.forEach((idx) => {
      fs.remove(`${objectPathname}/idx/${idx.name}.json`);
    });
  }
  let idxtoreindex = []; //store index that has to be reprocessto get full context
  idxs = idxs.length == 0 ? schema.apxidx : idxs; // get all index if none
  itms.forEach((i) => {
    if (crud == "I") {
      itm = fs.readJSONSync(i);
    }
    //console.log(itm);
    idxs.forEach((idx) => {
      const keyvalisunique = schema.apxuniquekey.includes(idx.keyval); // check if keyval is unique mean  store as an object (or string) else store as an array
      const idxsrc = `${objectPathname}/idx/${idx.name}.json`;
      const idxinit = idx.name.substring(0, 4) == "lst_" ? [] : {}; // select type of idx (array or object)
      let idxfile = !fs.existsSync(idxsrc) ? idxinit : fs.readJSONSync(idxsrc);
      if (idx.name.substring(0, 4) == "lst_") {
        if (["D", "U"].includes(crud)) {
          if (keyvalisunique) {
            idxfile = idxfile.filter((e) => e !== itmold[idx.keyval]);
          } else {
            idxtoreindex.push(idx); //@todo
          }
        }
        console.log(idx.keyval);
        console.log(itm[idx.keyval]);

        if (
          ["C", "U", "I"].includes(crud) &&
          !idxfile.includes(itm[idx.keyval])
        ) {
          idxfile.push(itm[idx.keyval]);
        }
      } else {
        if (!idx.objkey) {
          //mean all properties
          idx.objkey = Object.keys(schema.properties);
        }
        if (keyvalisunique && idx.objkey.length == 1) {
          if (["D", "U"].includes(crud)) {
            delete idxfile[itmold[idx.keyval]];
          } else {
            idxfile[itm[idx.keyval]] = itm[idx.objkey[0]];
          }
        }
        if (keyvalisunique && idx.objkey.length > 1) {
          if (["D", "U"].includes(crud)) {
            delete idxfile[itmold[idx.keyval]];
          } else {
            const itmfilter = {};
            idx.objkey.forEach((i) => {
              if (itm[i]) itmfilter[i] = itm[i];
            });
            idxfile[itm[idx.keyval]] = itmfilter;
          }
        }
        if (!keyvalisunique && idx.objkey.length == 1) {
          if (
            ["D", "U"].includes(crud) &&
            idxfile[itmold[idx.keyval]].IndexOf(itmold[idx.objkey[0]]) > -1
          ) {
            // U because need to remove previous value before adding it
            idxfile[itmold[idx.keyval]].splice(
              idxfile[itmold[idx.keyval]].IndexOf(itmold[idx.objkey[0]]),
              1
            );
          }
          if (["C", "U", "I"].includes(crud)) {
            if (!idxfile[itm[idx.keyval]]) idxfile[itm[idx.keyval]] = [];
            if (!idxfile[itm[idx.keyval]].includes(itm[idx.objkey[0]])) {
              idxfile[itm[idx.keyval]].push(itm[idx.objkey[0]]);
            }
          }
        }
        if (!keyvalisunique && idx.objkey.length > 1) {
          if (["D", "U"].includes(crud) && idxfile[itmold[idx.keyval]]) {
            // U because need to remove previous value before adding it
            let arrayofit = [];
            idxfile[itmold[idx.keyval]].forEach((it) => {
              if (it[schema.apxid] != itm[schema.apxid]) arrayofit.push(it);
            });
            idxfile[itmold[idx.keyval]] = arrayofit;
          }
          if (["C", "U", "I"].includes(crud)) {
            const itmfilter = {};
            idx.objkey.forEach((i) => {
              if (itm[i]) itmfilter[i] = itm[i];
            });
            if (!idxfile[itm[idx.keyval]]) idxfile[itm[idx.keyval]] = [];
            idxfile[itm[idx.keyval]].push(itmfilter);
          }
        }
      }
      fs.outputJSONSync(idxsrc, idxfile);
    });
  });
  if (crud != "I") {
    //update  lastupdatedata to inform something change
    const confschema = fs.readJSONSync(`${objectPathname}/conf.json`);
    confschema.lastupdatedata = dayjs();
    fs.outputJSONSync(`${objectPathname}/conf.json`, getschema.data.conf);
  }
  return { status: 200, ref: "Odmdb", msg: "successreindex", data: {} };
};
Odmdb.updatefromidxall = (objectname, idxname, data, lastupdate) => {
  /**
   * Update all itm of objectname from index idx/idxname with data
   * if itm exist in local and not in data then /ojectname/conf.json.lastupdate = now
   *    not then    /ojectname/conf.json.lastupdate = lastupdate
   * this way mean next time server A want to refresh from B its lastupdate < than on A
   */
  let conflastupdate = 0;
  let localidx = {};
  if (
    fs.existsSync(`${conf.dirapi}/nationchains/${objectname}/idx/${idxname}`)
  ) {
    localidx = fs.readJsonSync(
      `${conf.dirapi}/nationchains/${objectname}/idx/${idxname}`
    );
  }
  Object.keys(data).forEach((id) => {
    if (localidx[id]) {
      if (
        localidx[id].dt_update &&
        data[id].dt_update &&
        localidx[id].dt_update > data[id].dt_update
      ) {
        // means local information is fresher than the one in data for replacement
        // .toISIString ex: 2019-01-25T02:00:00.000Z'
        conflastupdate = dayjs().toISOString();
      } else {
        // replace itm with data
        localidx[id] = data[id];
        fs.outputJsonSync(
          `${conf.dirapi}/nationchains/${objectname}/itm/${id}.json`,
          data[id]
        );
      }
    } else {
      // add itm
      localidx[id] = data[id];
      fs.outputJsonSync(
        `${conf.dirapi}/nationchains/${objectname}/itm/${id}.json`,
        data[id]
      );
    }
  });
  //check if it miss id in fresher update means conf.lastupdate will be now to indicate
  Object.keys(localidx).forEach((id) => {
    if (!data[id]) {
      conflastupdate = dayjs();
    }
  });
  // update the object files
  if (conflastupdate == 0) conflastupdate = lastupdate;
  fs.outputJSONSync(
    `${conf.dirapi}/nationchains/${objectname}/idx/${idxname}`,
    localidx
  );
  const objconf = fs.readJsonSync(
    `${conf.dirapi}/nationchains/${objectname}/conf.json`
  );
  objconf.lastupdate = conflastupdate;
  fs.outputJsonSync(
    `${conf.dirapi}/nationchains/${objectname}/conf.json`,
    objconf
  );
  return {
    status: 200,
    ref: "Odmdb.js",
    info: "Successfullupdate",
    data: { objectname, idxname, lastupdate },
  };
};
module.exports = Odmdb;