import { h, ref, watch, onMounted } from 'vue';
import { fetchAstLog, fetchScoreText, putScoreText, fetchAudioWidget, URLS } from '../api.js';
import { parseAstLog, buildModel } from '../ast-parser.js';
import { patchScore } from '../exporter.js';
import { shortView } from '../node-views.js';
import { StatusPoller } from './StatusPoller.js';

export const PaneCP = {
    props: ['store', 'importOnLoad', 'onFocusFO'],
    setup(props) {
        const importing = ref(false);
        const importError = ref('');
        const exporting = ref(false);
        const exportError = ref('');
        const audioWidgetHtml = ref('');

        watch(
            () => props.store.synthesisStatus,
            async (s) => {
                if (!s?.frozen) { audioWidgetHtml.value = ''; return; }
                audioWidgetHtml.value = await fetchAudioWidget(
                    s.file_accomplished ? URLS.result : null,
                    s.errors ?? null,
                );
            },
        );

        async function doImport() {
            if (props.store.isDirty) return;
            importError.value = '';
            importing.value = true;
            try {
                const text = await fetchAstLog();
                props.store.scoreModel = buildModel(parseAstLog(text));
                props.store.exportLog = [];
            } catch (e) {
                importError.value = e.message;
            } finally {
                importing.value = false;
            }
        }

        async function doExport() {
            exportError.value = '';
            exporting.value = true;
            try {
                const raw = await fetchScoreText();
                props.store.rawScoreText = raw;
                const model = props.store.scoreModel;
                const { text: patched, log } = patchScore(
                    raw, model.instruments, model.bars, model.info, model.articles ?? [],
                    { articlesModified: !!model.articlesModified },
                );
                model.articlesModified = false;
                props.store.exportLog = log;
                await putScoreText(patched);
                props.store.synthesisStatus = { frozen: false, currently_rendered_notes: 0, notes_in_total: 0 };
            } catch (e) {
                exportError.value = e.message;
            } finally {
                exporting.value = false;
            }
        }

        onMounted(() => { if (props.importOnLoad) doImport(); });

        return () => {
            const store = props.store;
            const model = store.scoreModel;
            const fp = store.focusPath;

            // Build vertical path list: score root + each focus node.
            const pathItems = model ? [
                { node: model, idx: -1 },
                ...fp.map((node, idx) => ({ node, idx })),
            ] : [];

            return h('div', null, [
                // Header
                h('div', { class: 'se-cp-header' }, [
                    h('button', {
                        class: 'se-btn',
                        disabled: store.isDirty || importing.value,
                        title: store.isDirty ? 'Save or discard edits before re-importing' : 'Import from server',
                        onClick: doImport,
                    }, importing.value ? 'Importing…' : '→ Import'),
                    h('span', { class: 'se-cp-title' },
                        model ? (model.info?.title ?? 'Untitled score') : 'No score loaded'),
                    model ? h('button', {
                        class: 'se-btn se-btn-primary',
                        disabled: !store.isDirty || exporting.value,
                        onClick: doExport,
                    }, exporting.value ? 'Exporting…' : 'Export ↑') : null,
                ]),

                // Vertical focus path — short views, clickable to navigate up
                pathItems.length ? h('ul', { class: 'se-object-list se-cp-path' },
                    pathItems.map(({ node, idx }) => {
                        const { typeTag, label, meta } = shortView(node);
                        const isCurrent = idx === fp.length - 1 || (idx === -1 && fp.length === 0);
                        return h('li', {
                            class: ['se-object-item', isCurrent ? 'focused' : null],
                            onClick: () => {
                                if (idx === -1) store.setFocus([]);
                                else store.setFocus(fp.slice(0, idx + 1));
                                props.onFocusFO?.();
                            },
                        }, [
                            h('span', { class: 'se-object-type' }, typeTag),
                            h('span', { class: 'se-object-label' }, [
                                h('strong', null, label),
                                ...meta.map(({ key, value }) =>
                                    h('span', { style: 'color:#888;margin-left:0.5rem;font-size:0.8em' },
                                        `${key}=${value}`)
                                ),
                            ]),
                        ]);
                    })
                ) : null,

                // Import / export errors
                importError.value ? h('div', { class: 'se-error' }, importError.value) : null,
                exportError.value ? h('div', { class: 'se-error' }, exportError.value) : null,

                // Export log (shown after export, cleared on next import)
                store.exportLog?.length
                    ? h('div', { class: 'se-export-log' },
                        store.exportLog.map((entry, i) =>
                            h('div', {
                                key: i,
                                class: entry.level === 'changed' ? 'se-export-changed' : 'se-export-info',
                            }, entry.path ? `→ ${entry.path}` : entry.message)
                        )
                      )
                    : null,

                // Status poller (while running)
                store.synthesisStatus && !store.synthesisStatus.frozen
                    ? h(StatusPoller, { store }) : null,

                // Audio widget (rendered server-side from audiowidget.tmpl)
                audioWidgetHtml.value
                    ? h('div', { innerHTML: audioWidgetHtml.value, style: 'margin-top:0.5rem' })
                    : null,
            ]);
        };
    },
};