import { h } from 'vue';
import { ObjectShort } from './ObjectShort.js';
import { getKindGroups } from '../subobject-kinds.js';

function _barGroupKey(id) {
    const m = id.match(/(\d+|\D+)$/);
    return m ? id.slice(0, m.index) : id;
}

function _incrementId(id) {
    const m = id.match(/(\d+)$/);
    if (!m) return id + '1';
    const num = parseInt(m[1], 10) + 1;
    const padded = String(num).padStart(m[1].length, '0');
    return id.slice(0, m.index) + padded;
}

export const PaneSubObjects = {
    props: ['store', 'kind', 'onFocusFO'],
    setup(props) {
        function focused() {
            const fp = props.store.focusPath;
            return fp.length ? fp[fp.length - 1] : props.store.scoreModel;
        }

        function deleteItem(kind, node) {
            const store = props.store;
            const model = store.scoreModel;
            if (!model) return;

            if (kind === 'instrument') {
                const idx = model.instruments.indexOf(node);
                if (idx !== -1) { model.instruments.splice(idx, 1); store.markDirty(); }
            } else if (kind === 'articles') {
                const idx = (model.articles ?? []).indexOf(node);
                if (idx !== -1) { model.articles.splice(idx, 1); model.articlesModified = true; store.markDirty(); }
            } else if (kind === 'bar') {
                node.deleted = true;
                node.isDirty = true;
                store.markDirty();
            } else if (kind === 'variation') {
                for (const instr of model.instruments) {
                    const idx = instr.variations.indexOf(node);
                    if (idx !== -1) { instr.variations.splice(idx, 1); instr.isDirty = true; store.markDirty(); return; }
                    for (const v of instr.variations) {
                        const sidx = v.subvariations.indexOf(node);
                        if (sidx !== -1) { v.subvariations.splice(sidx, 1); instr.isDirty = true; store.markDirty(); return; }
                    }
                }
            } else if (kind === 'label_spec') {
                for (const instr of model.instruments) {
                    for (const v of instr.variations) {
                        const idx = v.labelSpecs.indexOf(node);
                        if (idx !== -1) { v.labelSpecs.splice(idx, 1); instr.isDirty = true; store.markDirty(); return; }
                        for (const sv of v.subvariations) {
                            const idx2 = sv.labelSpecs.indexOf(node);
                            if (idx2 !== -1) { sv.labelSpecs.splice(idx2, 1); instr.isDirty = true; store.markDirty(); return; }
                        }
                    }
                }
            }
        }

        function addBar(afterId) {
            const store = props.store;
            const model = store.scoreModel;
            if (!model) return;
            let newId;
            if (afterId) {
                newId = _incrementId(afterId);
            } else {
                const liveBars = (model.bars ?? []).filter(b => !b.deleted);
                newId = liveBars.length ? _incrementId(liveBars[liveBars.length - 1].id) : 'bar001';
            }
            const newBar = {
                type: 'bar', id: newId, isDirty: true, isNew: true,
                stressor: null, tempoLevels: null,
                upperStressBound: null, lowerStressBound: null, tempoShape: null,
                voices: {},
            };
            model.bars.push(newBar);
            store.markDirty();
            store.pushFocus(newBar);
            props.onFocusFO?.();
        }

        return () => {
            const node = focused();
            const groups = getKindGroups(node);
            const group = props.kind
                ? groups.find(g => g.kind === props.kind)
                : groups[0];
            const items = group?.items ?? [];

            if (!items.length && props.kind !== 'bar') return h('div', null, h('em', null, 'No sub-objects'));

            if (props.kind === 'bar') {
                const visibleItems = items.filter(item => !item.node.deleted);

                const barGroups = [];
                const seen = new Map();
                for (const item of visibleItems) {
                    const key = _barGroupKey(item.label);
                    if (!seen.has(key)) {
                        const g = { key, items: [] };
                        barGroups.push(g);
                        seen.set(key, g);
                    }
                    seen.get(key).items.push(item);
                }

                const groupEls = barGroups.map(g => {
                    const lastId = g.items[g.items.length - 1].label;
                    return h('div', { key: g.key, class: 'se-bar-group' }, [
                        ...g.items.map((item, idx) =>
                            h('span', {
                                key: idx,
                                class: ['se-bar-chip', props.store.focusPath.includes(item.node) ? 'focused' : null],
                            }, [
                                h('span', {
                                    class: 'se-bar-chip-label',
                                    onClick: () => { props.store.pushFocus(item.node); props.onFocusFO?.(); },
                                }, item.label),
                                h('button', {
                                    class: 'se-bar-chip-delete',
                                    title: 'Delete bar',
                                    onClick: e => { e.stopPropagation(); deleteItem('bar', item.node); },
                                }, '×'),
                            ])
                        ),
                        h('button', {
                            class: 'se-bar-add',
                            title: `Add bar after ${lastId}`,
                            onClick: () => addBar(lastId),
                        }, '+ add'),
                    ]);
                });

                return h('div', { class: 'se-bar-groups' }, [
                    ...groupEls,
                    h('div', { class: 'se-bar-group' },
                        h('button', { class: 'se-bar-add', onClick: () => addBar(null) }, '+ add bar')
                    ),
                ]);
            }

            return h('div', null,
                h('ul', { class: 'se-object-list' }, items.map((item, idx) =>
                    h(ObjectShort, {
                        key: idx,
                        label: item.label,
                        typeTag: item.kind,
                        focused: props.store.focusPath.includes(item.node),
                        hasChildren: item.hasChildren,
                        readOnly: item.readOnly ?? false,
                        deletable: item.deletable ?? false,
                        onFocus:     () => { props.store.pushFocus(item.node); props.onFocusFO?.(); },
                        onDrillDown: () => { props.store.pushFocus(item.node); props.onFocusFO?.(); },
                        onDelete: item.deletable ? () => deleteItem(item.kind, item.node) : undefined,
                    })
                ))
            );
        };
    },
};