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import { AlterSequenceChange, CreateSequenceOptions } from 'https://deno.land/x/pgsql_ast_parser@12.0.1/mod.ts';import { combineSubs, ignore, nullIsh } from '../utils.ts';import { NotSupported, asTable, _ISchema, _ISequence, _IType, _Transaction, RegClass, Reg } from '../interfaces-private.ts';import { ISubscription, nil, QueryError } from '../interfaces.ts';import { Types } from '../datatypes/index.ts';
interface SeqData {    currval: number | undefined;    nextval: number;}
export class Sequence implements _ISequence {
    get type(): 'sequence' {        return 'sequence';    }
    private symbol = Symbol();    private owner?: ISubscription;    private cfg: {        start?: number;        max?: number;        min?: number;        cycle?: boolean;        inc?: number;        dataType?: _IType;    } = {};
    readonly reg: Reg;

    get cycle() {        return this.cfg.cycle ?? false;    }
    get dataType() {        return this.cfg.dataType ?? Types.integer;    }
    get inc() {        return this.cfg.inc ?? 1;    }

    constructor(public name: string, readonly ownerSchema: _ISchema) {        this.reg = ownerSchema._reg_register(this);    }

    get start() {        return this.cfg.start ?? (this.inc > 0            ? this.min            : this.max);    }
    get max() {        return this.cfg.max            ?? (this.inc > 0                ? Number.MAX_SAFE_INTEGER - 1                : -1);    }
    get min() {        return this.cfg.min            ?? (this.inc > 0                ? 1                : Number.MIN_SAFE_INTEGER + 1);    }
    alter(t: _Transaction, opts: CreateSequenceOptions | AlterSequenceChange | nil): this {        if (!opts) {            return this;        }        const oldCfg = { ...this.cfg };        try {            if (!('type' in opts)) {                return this.alterOpts(t, opts);            }            switch (opts.type) {                case 'set options':                    this.alterOpts(t, opts);                    if (opts.restart === true || typeof opts.restart === 'number') {                        if (typeof opts.restart === 'number') {                            if (opts.restart < this.min) {                                throw new QueryError(`RESTART value (${opts.restart}) cannot be less than MINVALUE (${this.min})`, '22023');                            }                            this.cfg.start = opts.restart;                        }                        const data: SeqData = {                            currval: t.get<SeqData>(this.symbol)?.currval,                            nextval: this.start,                        }                        t.set(this.symbol, data);                    }                    return this;                case 'set schema':                    if (opts.newSchema.name === this.ownerSchema.name) {                        return this;                    }                    throw new NotSupported('Sequence schema change');                case 'rename':                    const to = opts.newName.name.toLowerCase();                    this.ownerSchema._reg_rename(this, this.name, to);                    this.name = to;                    return this;                case 'owner to':                    // todo: implement sequence owners ? ...ignored to support pg_dump exports.                    ignore(opts);                    return this;                default:                    throw NotSupported.never(opts);            }        } catch (e) {            this.cfg = oldCfg;            throw e;        }    }
    nextValue(t: _Transaction): number {        let v = t.get<SeqData>(this.symbol)?.nextval;        if (v === undefined) {            v = this.start;        }        this.setValue(t, v);        return v;    }
    setValue(t: _Transaction, value: number) {        if (value > this.max) {            throw new QueryError(`reached maximum value of sequence "${this.name}"`);        }        if (value < this.min) {            throw new QueryError(`reached minimum value of sequence "${this.name}"`);        }        const data: SeqData = {            currval: value,            nextval: value + this.inc,        };        t.set(this.symbol, data);    }
    restart(t: _Transaction) {        t.delete(this.symbol);    }
    currentValue(t: _Transaction): number {        const v = t.get<SeqData>(this.symbol)?.currval;        if (v === undefined) {            throw new QueryError(`currval of sequence "${this.name}" is not yet defined in this session`, '55000');        }        return v;    }

    private alterOpts(t: _Transaction, opts: CreateSequenceOptions) {        if (opts.as) {            ignore(opts.as);            this.cfg.dataType = this.ownerSchema.getType(opts.as);        }        ignore(opts.cache);        if (opts.cycle) {            this.cfg.cycle = opts.cycle === 'cycle';        }
        if (typeof opts.incrementBy === 'number') {            this.cfg.inc = opts.incrementBy;        }
        if (typeof opts.maxValue === 'number') {            this.cfg.max = opts.maxValue;        } else if (opts.maxValue) {            this.cfg.max = undefined;        }
        if (typeof opts.minValue === 'number') {            this.cfg.min = opts.minValue;        } else if (opts.maxValue) {            this.cfg.min = undefined;        }
        if (typeof opts.startWith === 'number') {            this.cfg.start = opts.startWith;        }

        if (opts.ownedBy === 'none') {            this.owner?.unsubscribe();        } else if (opts.ownedBy) {            this.owner?.unsubscribe();
            const tbl = asTable(this.ownerSchema.getObject({                name: opts.ownedBy.table,                schema: opts.ownedBy.schema            }));
            const owner = tbl.getColumnRef(opts.ownedBy.column);
            this.owner = combineSubs(                owner.onDrop(dt => this.drop(dt)),                tbl.onDrop(dt => this.drop(dt)),            );        }
        // === validate        if (this.max < this.min) {            throw new QueryError('Invalid squeuence min-max');        }
        if (!this.inc) {            throw new QueryError('Invalid increment');        }
        if (this.start > this.max || this.start < this.min) {            throw new QueryError('Invalid sequence starting value');        }        return this;    }
    drop(t: _Transaction) {        this.owner?.unsubscribe();        this.owner = undefined;        t.delete(this.symbol);        this.ownerSchema._reg_unregister(this);    }}