#!/usr/bin/env node

require('dotenv').config();
const express = require('express');
var https = require('https');
var bodyParser = require('body-parser');
const server = express();
const pg = require('pg');

//---------read sql files into variables----------------
var fs = require('fs');
//-------------------------------------------------------

var options = {
    key: fs.readFileSync(process.env.wd + 'key.pem'),
    cert: fs.readFileSync(process.env.wd + 'cert.pem'),
    passprase: []
};

https.createServer(options, server).listen(process.env.nodeport, () => {
    console.log(`${new Date().toISOString()}: Web service started on port ${process.env.nodeport}`)
});

var Postgres = new pg.Client({
    user: process.env.user,
    password: process.env.password,
    host: process.env.host,
    port: process.env.port,
    database: process.env.database,
    ssl: false,
    application_name: "osm_api"
});
Postgres.connect();

Postgres.FirstRow = function(inSQL, inResponse) {
    console.log(`${new Date().toISOString()}: Running query:\n${inSQL}`);
    Postgres.query(inSQL, [], (err, res) => {
        if (err === null) {
            console.log(`${new Date().toISOString()}: Received reponse: ${JSON.stringify(res.rows[0]).slice(0,100)}…`);
            inResponse.json(res.rows[0]);
            return;
        }
        console.log(`${new Date().toISOString()}: ${JSON.stringify(err.stack)}`);
        inResponse.json(err.stack);
    });
};

server.get('/', function(_, res) {
    console.log(`${new Date().toISOString()}: GET /  (Test if server is up.)… SQL: n/a ${"-._.".repeat(20)}`);
    res.send('node.js express is up and running');
});

server.get('/login', (_, res) => res.sendFile(process.env.wd + 'msauth.html'))

server.get('/logs', (_, res) => res.sendFile(process.env.wd + 'changes.log'))

server.get('/pgbadger', (_, res) => res.sendFile(process.env.wd + 'logs.html'))

server.get('/totals', (_, res) => res.sendFile(process.env.wd + 'totals.log'))

server.get('/test_sql', function(_, res) {
    var path = './route_meta/scenario_package.sql'
    var callback = function(arg) {
        res.send(arg)
    };

    fs.readFile(path, 'utf8', function(err, data) {
        if (!err) {
            callback(data);
        } else {
            res.send('Failed to read needed SQL file.');
        }
    });
});

server.get('/get_pool', bodyParser.json(), function(req, res) {

    var path = './route_sql/get_pool.sql';
    console.log(`${new Date().toISOString()}: GET /get_pool  (Get all data for one DSM.)… SQL: ${path} ${"-._.".repeat(20)}`);

    var callback = function(arg) {

        if (req.body.quota_rep) {
            // ensure backward compatibility
            console.log(`${new Date().toISOString()}:Converting old format… ${JSON.stringify(req.body)}`);
            req.body = {'scenario':{'quota_rep_descr':req.body.quota_rep}};
        }

        var where = build_where(req);
        if (where === '') {
            res.send("no body was sent");
            return;
        }

        var sql = arg.replace(new RegExp("where_clause", 'g'), where);
        Postgres.FirstRow(sql, res)
    };

    fs.readFile(path, 'utf8', function(err, data) {
        if (!err) {
            callback(data);
        } else {
            console.log(`${new Date().toISOString()}: error reading sql file: ${JSON.stringify(err)}`);
            res.send('Failed to read needed SQL file.');
        }
    });

})

server.get('/scenario_package', bodyParser.json(), function(req, res) {

    var path = './route_sql/scenario_package.sql';
    console.log(`${new Date().toISOString()}: GET /scenario_package  (Get all data for a given scenario)… SQL: ${path} ${"-._.".repeat(20)}`)

    fs.readFile(path, 'utf8', function(err, data) {
        if (!err) {
            callback(data);
        } else {
            console.log(`${new Date().toISOString()}: error reading sql file: ${JSON.stringify(err)}`);
            res.send('Failed to read needed SQL file.');
        }
    });

    var callback = function(arg) {
        var where = build_where(req);
        if (where === '') {
            res.send("no body was sent");
            return;
        }

        var sql = arg.replace(new RegExp("where_clause", 'g'), where)
        Postgres.FirstRow(sql, res)
    };
})

server.get('/swap_fit', bodyParser.json(), function(req, res) {

    var path = './route_sql/swap_fit.sql';
    console.log(`${new Date().toISOString()}: GET /swap_fit  (Obsolete.)… SQL: ${path} ${"-._.".repeat(20)}`)

    fs.readFile(path, 'utf8', function(err, data) {
        if (!err) {
            callback(data);
        } else {
            console.log(`${new Date().toISOString()}: error reading sql file: ${JSON.stringify(err)}`);
            res.send('Failed to read needed SQL file.');
        }
    });

    var callback = function(arg) {
        var where = build_where(req);
        if (where === '') {
            res.send("no body was sent");
            return;
        }
        var sql = arg.replace(new RegExp("where_clause", 'g'), where);
        sql = sql.replace(new RegExp("replace_new_mold", 'g'), req.body.new_mold);
        Postgres.FirstRow(sql, res)
    };
})

server.post('/swap', bodyParser.json(), function(req, res) {

    var path = './route_sql/swap_post.sql';
    console.log(`${new Date().toISOString()}: POST /swap  (Obsolete.)… SQL: ${path} ${"-._.".repeat(20)}`)

    fs.readFile(path, 'utf8', function(err, data) {
        if (!err) {
            callback(data);
        } else {
            console.log(`${new Date().toISOString()}: error reading sql file: ${JSON.stringify(err)}`);
            res.send('Failed to read needed SQL file.');
        }
    });

    var callback = function(arg) {
        var where = build_where(req);
        if (where === '') {
            res.send("no body was sent");
            return;
        }
        var sql = arg.replace(new RegExp("where_clause", 'g'), where);
        sql = sql.replace(new RegExp("swap_doc", 'g'), JSON.stringify(req.body.swap));
        sql = sql.replace(new RegExp("replace_version", 'g'), req.body.scenario.version);
        sql = sql.replace(new RegExp("replace_source", 'g'), req.body.source);
        sql = sql.replace(new RegExp("replace_iterdef", 'g'), JSON.stringify(req.body));
        Postgres.FirstRow(sql, res)
    };
})

server.post('/cust_swap', bodyParser.json(), function(req, res) {

    var path = './route_sql/swap_cust.sql';
    console.log(`${new Date().toISOString()}: POST /cust_swap  (Obsolete.)… SQL: ${path} ${"-._.".repeat(20)}`)

    fs.readFile(path, 'utf8', function(err, data) {
        if (!err) {
            callback(data);
        } else {
            console.log(`${new Date().toISOString()}: error reading sql file: ${JSON.stringify(err)}`);
            res.send('Failed to read needed SQL file.');
        }
    });

    var callback = function(arg) {
        var where = build_where(req);
        if (where === '') {
            res.send("no body was sent");
            return;
        }

        var sql = arg.replace(new RegExp("where_clause", 'g'), where);
        sql = sql.replace(new RegExp("swap_doc", 'g'), JSON.stringify(req.body.swap));
        sql = sql.replace(new RegExp("replace_version", 'g'), req.body.scenario.version);
        sql = sql.replace(new RegExp("replace_source", 'g'), req.body.source);
        sql = sql.replace(new RegExp("replace_iterdef", 'g'), JSON.stringify(req.body));
        Postgres.FirstRow(sql, res)
    };
})

server.get('/list_changes', bodyParser.json(), function(req, res) {

    var path = './route_sql/list_changes.sql';
    console.log(`${new Date().toISOString()}: GET /list_changes  (Get a list of adjustments made to DSM's pool.)… SQL: ${path} ${"-._.".repeat(20)}`)

    fs.readFile(path, 'utf8', function(err, data) {
        if (!err) {
            callback(data);
        } else {
            console.log(`${new Date().toISOString()}: error reading sql file: ${JSON.stringify(err)}`);
            res.send('Failed to read needed SQL file.');
        }
    });

    var callback = function(arg) {
        var where = build_where(req);
        if (where === '') {
            res.send("no body was sent");
            return;
        }

        var sql = arg.replace(new RegExp("where_clause", 'g'), where);
        Postgres.FirstRow(sql, res)
    };
})

server.get('/undo_change', bodyParser.json(), function(req, res) {

    var path = './route_sql/undo.sql';
    console.log(`${new Date().toISOString()}: GET /undo_change  (Remove an adjustment from the DSM's pool.)… SQL: ${path} ${"-._.".repeat(20)}`)

    fs.readFile(path, 'utf8', function(err, data) {
        if (!err) {
            callback(data);
        } else {
            console.log(`${new Date().toISOString()}: error reading sql file: ${JSON.stringify(err)}`);
            res.send('Failed to read needed SQL file.');
        }
    });

    var callback = function(arg) {
        var sql = arg.replace(new RegExp("replace_id", 'g'), JSON.stringify(req.body.logid))
        Postgres.FirstRow(sql, res)
    };
})

//deprecating this route, just use _vp for volume and prive
/*
server.post('/addmonth_v', bodyParser.json(), function(req, res) {

    var path = './route_sql/addmonth_vd.sql';
    console.log(`${new Date().toISOString()}: POST /add_month_v  (Obsolete.)… SQL: ${path} ${"-._.".repeat(20)}`);

    fs.readFile(path, 'utf8', function(err, data) {
        if (!err) {
            callback(data);
        } else {
            console.log(`${new Date().toISOString()}: error reading sql file: ${JSON.stringify(err)}`);
            res.send('Failed to read needed SQL file.');
        }
    });

    var callback = function(arg) {
        var where = build_where(req);
        if (where === '') {
            res.send("no body was sent");
            return;
        }

        req.body.stamp = new Date().toISOString()
        var sql = arg.replace(new RegExp("scenario = target_scenario", 'g'), where);
        sql = sql.replace(new RegExp("target_increment", 'g'), req.body.qty);
        sql = sql.replace(new RegExp("target_month", 'g'), req.body.month);
        sql = sql.replace(new RegExp("replace_version", 'g'), req.body.scenario.version);
        sql = sql.replace(new RegExp("replace_source", 'g'), req.body.source);
        sql = sql.replace(new RegExp("replace_iterdef", 'g'), JSON.stringify(req.body));
        Postgres.FirstRow(sql, res)
    }
})
*/

server.post('/addmonth_vp', bodyParser.json(), function(req, res) {

    var path = './route_sql/addmonth_vupd.sql';
    console.log(`${new Date().toISOString()}: POST /add_month_vp  (Add volume and pricing for a new month in the forecast.)… SQL: ${path} ${"-._.".repeat(20)}`);

    var callback = function(arg) {
        var where = build_where(req);
        if (where === '') {
            res.send("no body was sent");
            return;
        }

        req.body.stamp = new Date().toISOString()
        var sql = arg.replace(new RegExp("where_clause", 'g'), where);
        sql = sql.replace(new RegExp("target_volume", 'g'), req.body.qty);
        sql = sql.replace(new RegExp("target_price", 'g'), req.body.amount);
        sql = sql.replace(new RegExp("target_month", 'g'), req.body.month);
        sql = sql.replace(new RegExp("replace_version", 'g'), req.body.scenario.version);
        sql = sql.replace(new RegExp("replace_source", 'g'), req.body.source);
        sql = sql.replace(new RegExp("replace_iterdef", 'g'), JSON.stringify(req.body));
        Postgres.FirstRow(sql, res)
    }

    fs.readFile(path, 'utf8', function(err, data) {
        if (!err) {
            callback(data);
        } else {
            console.log(`${new Date().toISOString()}: error reading sql file: ${JSON.stringify(err)}`);
            res.send('Failed to read needed SQL file.');
        }
    });
})

server.post('/scale_v', bodyParser.json(), function(req, res) {

    var path = './route_sql/scale_vd.sql';
    console.log(`${new Date().toISOString()}: POST /scale_v  (Scale the volume for the given scenario.)… SQL: ${path} ${"-._.".repeat(20)}`);

    var callback = function(arg) {
        var where = build_where(req);
        if (where === '') {
            res.send("no body was sent");
            return;
        }

        req.body.stamp = new Date().toISOString()
        var sql = arg.replace(new RegExp("where_clause", 'g'), where);
        sql = sql.replace(new RegExp("incr_qty", 'g'), req.body.qty);
        sql = sql.replace(new RegExp("replace_version", 'g'), req.body.scenario.version);
        sql = sql.replace(new RegExp("replace_source", 'g'), req.body.source);
        sql = sql.replace(new RegExp("replace_iterdef", 'g'), JSON.stringify(req.body));
        Postgres.FirstRow(sql, res)
    }

    fs.readFile(path, 'utf8', function(err, data) {
        if (!err) {
            callback(data);
        } else {
            console.log(`${new Date().toISOString()}: error reading sql file: ${JSON.stringify(err)}`);
            res.send('Failed to read needed SQL file.');
        }
    });
})

server.post('/scale_p', bodyParser.json(), function(req, res) {

    var path = './route_sql/scale_pd.sql';
    console.log(`${new Date().toISOString()}: POST /scale_p  (Scale price for the given scenario.)… SQL: ${path} ${"-._.".repeat(20)}`);

    var callback = function(arg) {
        var where = build_where(req);
        if (where === '') {
            res.send("no body was sent");
            return;
        }

        req.body.stamp = new Date().toISOString()
        var sql = arg.replace(new RegExp("where_clause", 'g'), where);
        sql = sql.replace(new RegExp("target_increment", 'g'), req.body.amount);
        sql = sql.replace(new RegExp("replace_version", 'g'), req.body.scenario.version);
        sql = sql.replace(new RegExp("replace_source", 'g'), req.body.source);
        sql = sql.replace(new RegExp("replace_iterdef", 'g'), JSON.stringify(req.body));
        Postgres.FirstRow(sql, res)
    }

    fs.readFile(path, 'utf8', function(err, data) {
        if (!err) {
            callback(data);
        } else {
            console.log(`${new Date().toISOString()}: error reading sql file: ${JSON.stringify(err)}`);
            res.send('Failed to read needed SQL file.');
        }
    });
})

server.post('/scale_vp', bodyParser.json(), function(req, res) {

    var path = './route_sql/scale_vupd.sql';
    console.log(`${new Date().toISOString()}: POST /scale_vp  (Scale volume and price for the given scenario.)… SQL: ${path} ${"-._.".repeat(20)}`);

    var callback = function(arg) {
        var where = build_where(req);
        if (where === '') {
            res.send("no body was sent");
            return;
        }

        req.body.stamp = new Date().toISOString()
        var sql = arg.replace(new RegExp("where_clause", 'g'), where);
        sql = sql.replace(new RegExp("target_vol", 'g'), req.body.qty);
        sql = sql.replace(new RegExp("target_prc", 'g'), req.body.amount);
        sql = sql.replace(new RegExp("replace_version", 'g'), req.body.scenario.version);
        sql = sql.replace(new RegExp("replace_source", 'g'), req.body.source);
        sql = sql.replace(new RegExp("replace_iterdef", 'g'), JSON.stringify(req.body));
        Postgres.FirstRow(sql, res)
    }

    fs.readFile(path, 'utf8', function(err, data) {
        if (!err) {
            callback(data);
        } else {
            console.log(`${new Date().toISOString()}: error reading sql file: ${JSON.stringify(err)}`);
            res.send('Failed to read needed SQL file.');
        }
    });
})

server.post('/scale_vp_sales', bodyParser.json(), function(req, res) {

    var path = './route_sql/scale_vupd.sql';
    console.log(`${new Date().toISOString()}: POST /scale_vp_sales  (Obsolete.)… SQL: ${path} ${"-._.".repeat(20)}`);

    var callback = function(arg) {
        var where = build_where(req);
        if (where === '') {
            res.send("no body was sent");
            return;
        }

        req.body.stamp = new Date().toISOString()
        var sql = arg.replace(new RegExp("where_clause", 'g'), where);
        sql = sql.replace(new RegExp("target_vol", 'g'), req.body.qty);
        sql = sql.replace(new RegExp("target_prc", 'g'), req.body.amount);
        sql = sql.replace(new RegExp("replace_version", 'g'), req.body.scenario.version);
        sql = sql.replace(new RegExp("replace_source", 'g'), req.body.source);
        sql = sql.replace(new RegExp("replace_iterdef", 'g'), JSON.stringify(req.body));
        Postgres.FirstRow(sql, res)
    }

    fs.readFile(path, 'utf8', function(err, data) {
        if (!err) {
            callback(data);
        } else {
            console.log(`${new Date().toISOString()}: error reading sql file: ${JSON.stringify(err)}`);
            res.send('Failed to read needed SQL file.');
        }
    });
})

server.post('/new_part', bodyParser.json(), function(req, res) {

    var path = './route_sql/new_part.sql';
    console.log(`${new Date().toISOString()}: POST /new_part  (Obsolete.)… SQL: ${path} ${"-._.".repeat(20)}`);

    var callback = function(arg) {
        var where = build_where(req);
        if (where === '') {
            res.send("no body was sent");
            return;
        }

        req.body.stamp = new Date().toISOString()
        var sql = arg.replace(new RegExp("where_clause", 'g'), where);
        sql = sql.replace(new RegExp("target_vol", 'g'), req.body.qty);
        sql = sql.replace(new RegExp("target_prc", 'g'), req.body.amount);
        sql = sql.replace(new RegExp("replace_request", 'g'), JSON.stringify(req.body));
        sql = sql.replace(new RegExp("replace_version", 'g'), req.body.scenario.version);
        sql = sql.replace(new RegExp("replace_source", 'g'), req.body.source);
        sql = sql.replace(new RegExp("replace_iterdef", 'g'), JSON.stringify(req.body));
        Postgres.FirstRow(sql, res)
    }

    fs.readFile(path, 'utf8', function(err, data) {
        if (!err) {
            callback(data);
        } else {
            console.log(`${new Date().toISOString()}: error reading sql file: ${JSON.stringify(err)}`);
            res.send('Failed to read needed SQL file.');
        }
    });
})

server.post('/new_basket', bodyParser.json(), function(req, res) {

    var path = './route_sql/new_basket.sql';
    console.log(`${new Date().toISOString()}: POST /new_basket  (Add new part and/or customer.)… SQL: ${path} ${"-._.".repeat(20)}`);

    var callback = function(arg) {
        req.body.scenario.iter.push("adj volume"); //intercept the request body and force in a "adj volume" at position 1, only a "copy" iteration is being used

        var where = build_where(req);
        if (where === '') {
            res.send("no body was sent");
            return;
        }

        req.body.stamp = new Date().toISOString()
        var sql = arg.replace(new RegExp("where_clause", 'g'), where);
        sql = sql.replace(new RegExp("target_vol", 'g'), req.body.qty);
        sql = sql.replace(new RegExp("target_prc", 'g'), req.body.amount);
        sql = sql.replace(new RegExp("replace_request", 'g'), JSON.stringify(req.body));
        sql = sql.replace(new RegExp("replace_version", 'g'), req.body.scenario.version);
        sql = sql.replace(new RegExp("replace_source", 'g'), req.body.source);
        sql = sql.replace(new RegExp("replace_iterdef", 'g'), JSON.stringify(req.body));
        Postgres.FirstRow(sql, res)
    }

    fs.readFile(path, 'utf8', function(err, data) {
        if (!err) {
            callback(data);
        } else {
            console.log(`${new Date().toISOString()}: error reading sql file: ${JSON.stringify(err)}`);
            res.send('Failed to read needed SQL file.');
        }
    });
})

function build_where(req) {
    console.log(`${new Date().toISOString()}: Building WHERE from ${JSON.stringify(req.body)}`);
    var where = '';
    var clauseCount = 1;
    for (var i in req.body.scenario) {
        if (clauseCount > 1) {
            where = where +
                `
            AND `;
        }
        if (Array.isArray(req.body.scenario[i])) {
            //if the scenario key has a value that is an array of items, push it into an `IN` statement
            //iter = [stage1, stage2]   -->  SQL  -->  iter IN ('stag1', stage2')
            var listCount = 1;
            where = where + i + " IN (";
            for (var j in req.body.scenario[i]) {
                if (listCount > 1) {
                    where = where + ",";
                }
                where = where + "'" + req.body.scenario[i][j] + "'";
                listCount = listCount + 1;
            }
            where = where + ")";
        } else {
            where = where + i + " = '" + req.body.scenario[i] + "'";
        }
        clauseCount = clauseCount + 1;
    };
    //if the request has a stamp, then it's an adjustment
    //prevent making adjustment to actual history by limiting to current stamp and beyond
    if (req.body.stamp) {
        where = where +
            `
            AND order_date >= least('` + req.body.stamp + "'::date,'2021-06-01')";
    }
    console.log(`${new Date().toISOString()}: Returning ${where}`);
    return where;
}