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import { _ITable, _Transaction, IValue, _Explainer, nil, _ISchema, asTable, _ISelection, _IIndex, QueryError, OnConflictHandler, ChangeOpts, _IStatement, NotSupported } from '../../interfaces-private.ts';import { InsertStatement } from 'https://deno.land/x/pgsql_ast_parser@12.0.1/mod.ts';import { buildValue } from '../../parser/expression-builder.ts';import { Types } from '../../datatypes/index.ts';import { JoinSelection } from '../../transforms/join.ts';import { MutationDataSourceBase, createSetter } from './mutation-base.ts';import { ArrayFilter } from '../../transforms/array-filter.ts';import { withSelection, buildCtx } from '../../parser/context.ts';import { buildValues, buildSelect } from '../../execution/select.ts';import { IndexConstraint } from '../../constraints/index-cst.ts';
export class Insert extends MutationDataSourceBase<any> {
    private valueRawSource: _ISelection;    private insertColumns!: string[];    private valueConvertedSource!: IValue<any>[];    private opts!: ChangeOpts;

    constructor(ast: InsertStatement) {        const { schema } = buildCtx();        // get table to insert into        const table = asTable(schema.getObject(ast.into));        const selection = table            .selection            .setAlias(ast.into.alias);
        // init super        super(table, selection, ast);
        // get data to insert        this.valueRawSource = ast.insert.type === 'values'            ? buildValues(ast.insert, true)            : buildSelect(ast.insert);

        withSelection(this, () => this.visit(ast));    }
    private visit(ast: InsertStatement) {
        // check not inserting too many values        this.insertColumns = ast.columns?.map(x => x.name)            ?? this.table.selection.columns.map(x => x.id!)                .slice(0, this.valueRawSource.columns.length);        if (this.valueRawSource.columns.length > this.insertColumns.length) {            throw new QueryError(`INSERT has more expressions than target columns`);        }
        // check insert types        this.valueConvertedSource = this.insertColumns.map((col, i) => {            const value = this.valueRawSource.columns[i];            const insertInto = this.table.selection.getColumn(col);            // It seems that the explicit conversion is only performed when inserting values.            const canConvert = ast.insert.type === 'values'                ? value.type.canCast(insertInto.type)                : value.type.canConvertImplicit(insertInto.type);            if (!canConvert) {                throw new QueryError(`column "${col}" is of type ${insertInto.type.name} but expression is of type ${value.type.name}`);            }            return value.type === Types.default                ? value  // handle "DEFAULT" values                : value.cast(insertInto.type);        });

        // build 'on conflict' strategy        let ignoreConflicts: OnConflictHandler | nil = undefined;        if (ast.onConflict) {            // find the targeted index            let onIndex: _IIndex | nil = null;            const _on = ast.onConflict.on;            switch (_on?.type) {                case 'on expr':                    const exprs = _on.exprs;                    const on = withSelection(this.table.selection, () => exprs.map(x => buildValue(x)));                    onIndex = this.table.getIndex(...on);                    break;                case 'on constraint':                    const cst = this.table.getConstraint(_on.constraint.name);                    if (cst instanceof IndexConstraint) {                        onIndex = cst.index;                    }                    break;                case undefined:                    // on "on constraint" in statement                    break;                default:                    throw NotSupported.never(_on, 'unexpected "on conflict" type');            }            if (!!_on && !onIndex?.unique) {                throw new QueryError(`There is no unique or exclusion constraint matching the ON CONFLICT specification`);            }
            // check if 'do nothing'            if (ast.onConflict.do === 'do nothing') {                ignoreConflicts = { ignore: onIndex ?? 'all' };            } else {                if (!onIndex) {                    throw new QueryError(`ON CONFLICT DO UPDATE requires inference specification or constraint name`);                }                const subject = new JoinSelection(                    this.mutatedSel                    // fake data... we're only using this to get the multi table column resolution:                    , new ArrayFilter(this.table.selection, []).setAlias('excluded')                    , {                        type: 'LEFT JOIN',                        on: { type: 'boolean', value: false }                    }                    , false                );                const setter = createSetter(this.table, subject, ast.onConflict.do.sets,);                const _where = ast.onConflict.where;                const where = _where && withSelection(subject, () => buildValue(_where));                ignoreConflicts = {                    onIndex,                    update: (item, excluded, t) => {                        // build setter context                        const jitem = subject.buildItem(item, excluded);
                        // check "WHERE" clause on conflict                        if (where) {                            const whereClause = where.get(jitem, t);                            if (whereClause !== true) {                                return;                            }                        }
                        // execute set                        setter(t, item, jitem);                    },                }            }        }
        this.opts = {            onConflict: ignoreConflicts,            overriding: ast.overriding        };    }
    protected performMutation(t: _Transaction): any[] {
        // enumerate & get        const values: any[][] = [];        for (const o of this.valueRawSource.enumerate(t)) {            const nv = [];            for (let i = 0; i < this.insertColumns.length; i++) {                const _custom = this.valueConvertedSource[i].get(o, t);                nv.push(_custom);            }            values.push(nv);        }

        // insert values        const ret: any[] = [];
        for (const val of values) {            if (val.length !== this.insertColumns.length) {                throw new QueryError('Insert columns / values count mismatch');            }            const toInsert: any = {};            for (let i = 0; i < val.length; i++) {                const v = val[i];                const col = this.valueConvertedSource[i];                if (col.type === Types.default) {                    continue; // insert a 'DEFAULT' value                }                toInsert[this.insertColumns[i]] = v;                // if ('_custom' in v) {                //      toInsert[columns[i]] = v._custom;                // } else {                //     const notConv = buildValue(table.selection, v);                //     const converted = notConv.cast(col.type);                //     if (!converted.isConstant) {                //         throw new QueryError('Cannot insert non constant expression');                //     }                //     toInsert[columns[i]] = converted.get();                // }            }            const insertedRow = this.table.doInsert(t, toInsert, this.opts)            if (insertedRow) {                ret.push(insertedRow);            }        }
        return ret;    }}