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import { _ISchema, QueryError } from '../../interfaces-private.ts';import { numbers, isInteger, dateTypes, Types, numberPriorities } from '../../datatypes/index.ts';import { intervalToSec, queryJson } from '../../utils.ts';import moment from 'https://deno.land/x/momentjs@2.29.1-deno/mod.ts';
export function registerCommonOperators(schema: _ISchema) {    registerNumericOperators(schema);    registerDatetimeOperators(schema);    registerJsonOperators(schema);    registerTextOperators(schema);}
function* numberPairs() {    for (const a of numbers) {        for (const b of numbers) {            yield [a, b, numberPriorities[a] < numberPriorities[b] ? b : a] as const;        }    }}
function registerNumericOperators(schema: _ISchema) {    // ======= "+ - * /" on numeric types =======    for (const [left, right, returns] of numberPairs()) {        schema.registerOperator({            operator: '+',            commutative: true,            left,            right,            returns,            implementation: (a, b) => a + b,        });    }    for (const [left, right, returns] of numberPairs()) {        schema.registerOperator({            operator: '-',            commutative: true,            left,            right,            returns,            implementation: (a, b) => a - b,        });    }
    for (const [left, right, returns] of numberPairs()) {        schema.registerOperator({            operator: '*',            commutative: true,            left,            right,            returns,            implementation: (a, b) => a * b,        });    }
    for (const [left, right, returns] of numberPairs()) {        schema.registerOperator({            operator: '/',            commutative: false,            left,            right,            returns,            implementation: isInteger(returns)                ? ((a, b) => Math.trunc(a / b))                : ((a, b) => a / b),        });    }}

function registerDatetimeOperators(schema: _ISchema) {    // ======= date/time "+ -" timestamp =======    for (const dt of dateTypes) {        for (const [operator, f] of [['+', 1], ['-', -1]] as const) {            schema.registerOperator({                operator,                commutative: operator === '+',                left: dt,                right: Types.interval,                returns: dt,                implementation: (a, b) => moment(a).add(f * intervalToSec(b), 'seconds').toDate(),            });        }    }
    // ==== date "+ -" integer  (add days.. only works on dates, not timestamps)    for (const [operator, f] of [['+', 1], ['-', -1]] as const) {        schema.registerOperator({            operator,            commutative: operator === '+',            left: Types.date,            right: Types.integer,            returns: Types.date,            implementation: (a, b) => moment(a).add(f * b, 'days').toDate(),        });    }}


function registerJsonOperators(schema: _ISchema) {    // ======= "json @> json" query operator    schema.registerOperator({        operator: '@>',        left: Types.jsonb,        right: Types.jsonb,        returns: Types.bool,        implementation: (a, b) => queryJson(b, a),    });
    // ======= "json - text" (remove key)    schema.registerOperator({        operator: '-',        left: Types.jsonb,        right: Types.text(),        returns: Types.jsonb,        implementation: (a, b) => {            if (Array.isArray(a)) {                return a.filter(x => x !== b);            }            if (typeof a === 'object') {                const ret = { ...a };                delete ret[b];                return ret;            }            throw new QueryError('cannot delete from scalar', '22023');        },    });
    // ======= "json - int" (remove index)    schema.registerOperator({        operator: '-',        left: Types.jsonb,        right: Types.integer,        returns: Types.jsonb,        implementation: (a, b) => {            if (Array.isArray(a)) {                const ret = [...a];                ret.splice(b, 1);                return ret;            }            if (typeof a === 'object') {                throw new QueryError('cannot delete from object using integer index', '22023');            }            throw new QueryError('cannot delete from scalar', '22023');        },    })}

function registerTextOperators(schema: _ISchema) {    // ======== "text || text" (concat text operator)    schema.registerOperator({        operator: '||',        left: Types.text(),        right: Types.text(),        returns: Types.text(),        implementation: (a, b) => a + b,    })}