importScripts('opentally.js');

var wasm = wasm_bindgen;

async function initWasm() {
	await wasm_bindgen('opentally_bg.wasm');
	postMessage({'type': 'init', 'version': wasm.version()});
}
initWasm();

onmessage = function(evt) {
	if (evt.data.type === 'countElection') {
		let numbers;
		if (evt.data.numbers === 'fixed') {
			numbers = 'Fixed';
			wasm.fixed_set_dps(evt.data.decimals);
		} else if (evt.data.numbers === 'float64') {
			numbers = 'NativeFloat64';
		} else if (evt.data.numbers === 'rational') {
			numbers = 'Rational';
		} else {
			throw 'Unknown --numbers';
		}
		
		// Init election
		let election = wasm['election_from_blt_' + numbers](evt.data.electionData);
		
		// Init STV options
		let opts = wasm.STVOptions.new.apply(null, evt.data.optsStr);
		
		// Describe count
		postMessage({'type': 'describeCount', 'content': wasm['describe_count_' + numbers](evt.data.filePath, election, opts)});
		
		// Init results table
		postMessage({'type': 'initResultsTable', 'content': wasm['init_results_table_' + numbers](election, opts)});
		
		// Step election
		let state = wasm['CountState' + numbers].new(election);
		wasm['count_init_' + numbers](state, opts);
		
		postMessage({'type': 'updateResultsTable', 'result': wasm['update_results_table_' + numbers](1, state, opts)});
		postMessage({'type': 'updateStageComments', 'comment': wasm['update_stage_comments_' + numbers](state)});
		
		for (let stageNum = 2;; stageNum++) {
			let isDone = wasm['count_one_stage_' + numbers](state, opts);
			if (isDone) {
				break;
			}
			
			postMessage({'type': 'updateResultsTable', 'result': wasm['update_results_table_' + numbers](stageNum, state, opts)});
			postMessage({'type': 'updateStageComments', 'comment': wasm['update_stage_comments_' + numbers](state)});
		}
		
		postMessage({'type': 'updateResultsTable', 'result': wasm['finalise_results_table_' + numbers](state)});
		postMessage({'type': 'finalResultSummary', 'summary': wasm['final_result_summary_' + numbers](state)});
	}
}