import { stringifyCollection } from '../stringify/stringifyCollection.js';
import { addPairToJSMap } from './addPairToJSMap.js';
import { Collection } from './Collection.js';
import { isPair, isScalar, MAP } from './identity.js';
import { Pair, createPair } from './Pair.js';
import { isScalarValue } from './Scalar.js';

function findPair(items, key) {
    const k = isScalar(key) ? key.value : key;
    for (const it of items) {
        if (isPair(it)) {
            if (it.key === key || it.key === k)
                return it;
            if (isScalar(it.key) && it.key.value === k)
                return it;
        }
    }
    return undefined;
}
class YAMLMap extends Collection {
    static get tagName() {
        return 'tag:yaml.org,2002:map';
    }
    constructor(schema) {
        super(MAP, schema);
        this.items = [];
    }
    /**
     * A generic collection parsing method that can be extended
     * to other node classes that inherit from YAMLMap
     */
    static from(schema, obj, ctx) {
        const { keepUndefined, replacer } = ctx;
        const map = new this(schema);
        const add = (key, value) => {
            if (typeof replacer === 'function')
                value = replacer.call(obj, key, value);
            else if (Array.isArray(replacer) && !replacer.includes(key))
                return;
            if (value !== undefined || keepUndefined)
                map.items.push(createPair(key, value, ctx));
        };
        if (obj instanceof Map) {
            for (const [key, value] of obj)
                add(key, value);
        }
        else if (obj && typeof obj === 'object') {
            for (const key of Object.keys(obj))
                add(key, obj[key]);
        }
        if (typeof schema.sortMapEntries === 'function') {
            map.items.sort(schema.sortMapEntries);
        }
        return map;
    }
    /**
     * Adds a value to the collection.
     *
     * @param overwrite - If not set `true`, using a key that is already in the
     *   collection will throw. Otherwise, overwrites the previous value.
     */
    add(pair, overwrite) {
        let _pair;
        if (isPair(pair))
            _pair = pair;
        else if (!pair || typeof pair !== 'object' || !('key' in pair)) {
            // In TypeScript, this never happens.
            _pair = new Pair(pair, pair?.value);
        }
        else
            _pair = new Pair(pair.key, pair.value);
        const prev = findPair(this.items, _pair.key);
        const sortEntries = this.schema?.sortMapEntries;
        if (prev) {
            if (!overwrite)
                throw new Error(`Key ${_pair.key} already set`);
            // For scalars, keep the old node & its comments and anchors
            if (isScalar(prev.value) && isScalarValue(_pair.value))
                prev.value.value = _pair.value;
            else
                prev.value = _pair.value;
        }
        else if (sortEntries) {
            const i = this.items.findIndex(item => sortEntries(_pair, item) < 0);
            if (i === -1)
                this.items.push(_pair);
            else
                this.items.splice(i, 0, _pair);
        }
        else {
            this.items.push(_pair);
        }
    }
    delete(key) {
        const it = findPair(this.items, key);
        if (!it)
            return false;
        const del = this.items.splice(this.items.indexOf(it), 1);
        return del.length > 0;
    }
    get(key, keepScalar) {
        const it = findPair(this.items, key);
        const node = it?.value;
        return (!keepScalar && isScalar(node) ? node.value : node) ?? undefined;
    }
    has(key) {
        return !!findPair(this.items, key);
    }
    set(key, value) {
        this.add(new Pair(key, value), true);
    }
    /**
     * @param ctx - Conversion context, originally set in Document#toJS()
     * @param {Class} Type - If set, forces the returned collection type
     * @returns Instance of Type, Map, or Object
     */
    toJSON(_, ctx, Type) {
        const map = Type ? new Type() : ctx?.mapAsMap ? new Map() : {};
        if (ctx?.onCreate)
            ctx.onCreate(map);
        for (const item of this.items)
            addPairToJSMap(ctx, map, item);
        return map;
    }
    toString(ctx, onComment, onChompKeep) {
        if (!ctx)
            return JSON.stringify(this);
        for (const item of this.items) {
            if (!isPair(item))
                throw new Error(`Map items must all be pairs; found ${JSON.stringify(item)} instead`);
        }
        if (!ctx.allNullValues && this.hasAllNullValues(false))
            ctx = Object.assign({}, ctx, { allNullValues: true });
        return stringifyCollection(this, ctx, {
            blockItemPrefix: '',
            flowChars: { start: '{', end: '}' },
            itemIndent: ctx.indent || '',
            onChompKeep,
            onComment
        });
    }
}

export { YAMLMap, findPair };