/**
 * ZDDC Classifier — in-place rename engine.
 *
 * Renames SOURCE files to their canonical ZDDC names, ON DISK, IN PLACE.
 * DESTRUCTIVE — there is no backup. HTTP-backed handles (zddc-server) take the
 * atomic server-side move (single round-trip); local File System Access handles
 * copy+remove (the API has no native rename verb). The source folder is the only
 * thing written.
 *
 * Resumable + boring: a file already at its target name is skipped, so a re-run
 * after an interruption only renames what's left. One file in, one file out.
 *
 * Lifted out of the old Rename-in-place spreadsheet so the By-Tracking grid can
 * drive the same, already-proven rename path.
 */
(function () {
    'use strict';

    // The folder handle holding `file`. Fresh-scan files carry it; snapshot-loaded
    // files resolve it (and their own handle) lazily from the workspace root.
    async function folderHandleFor(file) {
        if (file.folderHandle) return file.folderHandle;
        if (window.app.modules.scanner && window.app.modules.scanner.resolveFileHandle && window.app.rootHandle) {
            await window.app.modules.scanner.resolveFileHandle(window.app.rootHandle, file);
            if (file.folderHandle) return file.folderHandle;
        }
        throw new Error('source folder not connected');
    }

    // Rename one file in place to `newName`. Returns 'renamed' | 'skipped'.
    // Mutates the in-memory file object to its NEW identity (originalFilename /
    // extension / handle) so the rest of the app sees the renamed file.
    async function renameTo(file, newName) {
        var oldName = window.zddc.joinExtension(file.originalFilename, file.extension);
        if (oldName === newName) return 'skipped';
        if (file.isVirtual) throw new Error('cannot rename a file inside a ZIP — extract it first');

        var folder = await folderHandleFor(file);
        var perm = await folder.queryPermission({ mode: 'readwrite' });
        if (perm !== 'granted') {
            var granted = await folder.requestPermission({ mode: 'readwrite' });
            if (granted !== 'granted') throw new Error('write permission denied');
        }

        var src = window.zddc.source;
        if (src && src.isHttpHandle && src.isHttpHandle(folder)) {
            var base = new URL(folder.url()).pathname;
            await src.moveFile(base + encodeURIComponent(oldName), base + encodeURIComponent(newName));
            file.handle = await folder.getFileHandle(newName);
        } else {
            var oldHandle = await folder.getFileHandle(oldName);
            var data = await oldHandle.getFile();
            var newHandle = await folder.getFileHandle(newName, { create: true });
            var w = await newHandle.createWritable();
            await w.write(data);
            await w.close();
            await folder.removeEntry(oldName);
            file.handle = newHandle;
        }

        var split = window.zddc.splitExtension(newName);
        file.originalFilename = split.name;
        file.extension = split.extension;
        return 'renamed';
    }

    // Rename a batch of { file, newName } items. Returns { renamed, skipped, errors }.
    // onProgress(done, total, name) is called before each file.
    async function runInPlace(items, onProgress) {
        var s = { renamed: 0, skipped: 0, errors: 0 };
        for (var i = 0; i < items.length; i++) {
            if (onProgress) onProgress(i + 1, items.length, items[i].newName);
            try { s[await renameTo(items[i].file, items[i].newName)]++; }
            catch (e) {
                s.errors++;
                if (window.zddc && window.zddc.toast) window.zddc.toast('Rename failed for ' + items[i].newName + ' — ' + (e.message || e), 'error');
            }
        }
        return s;
    }

    window.app.modules.rename = { renameTo: renameTo, runInPlace: runInPlace };
})();