import { fmtCue, fmtDb, fmtPan } from '../protocol.js'

const ENTITY_VARS = {
	input: ['name', 'fader', 'mute', 'pan'],
	buss: ['name', 'mode', 'stereo', 'fader', 'mute'],
	matrix: ['name', 'fader', 'mute'],
	cg: ['name', 'fader', 'mute'],
	minput: ['name'],
}

/** Variable id prefix per entity kind (matrix inputs are matrix_in_N_...). */
export const VAR_PREFIX = { input: 'input', buss: 'buss', matrix: 'matrix', cg: 'cg', minput: 'matrix_in' }

const VAR_LABEL = {
	name: 'name',
	fader: 'fader level (dB)',
	mute: 'mute state',
	pan: 'pan',
	mode: 'mode (Aux/Group)',
	stereo: 'Stereo/Mono',
}

const ENT_LABEL = { input: 'Input', buss: 'Buss', matrix: 'Matrix output', cg: 'Control group', minput: 'Matrix input' }

/** Variables exist only for entities the console reported (all possible ones until the first load finishes). */
export function getVariableDefinitions(inst) {
	const defs = {
		console_name: { name: 'Console name' },
		session_name: { name: 'Session file name' },
		connected: { name: 'Console link alive (Yes/No)' },
		relay_clients: { name: 'iPad apps connected through the relay' },
		relay_client_ips: { name: 'iPad client IPs' },
		fades_running: { name: 'Number of level fades running' },
		last_change: { name: 'Last change reported by the console' },
		snapshot_index: { name: 'Current snapshot index' },
		snapshot_name: { name: 'Current snapshot name' },
		snapshot_cue: { name: 'Current snapshot cue number' },
		snapshot_count: { name: 'Number of snapshots' },
	}
	for (const ent of Object.keys(ENTITY_VARS)) {
		for (const n of inst.state.numbers(ent)) {
			for (const field of ENTITY_VARS[ent]) defs[`${VAR_PREFIX[ent]}_${n}_${field}`] = { name: `${ENT_LABEL[ent]} ${n} ${VAR_LABEL[field]}` }
		}
	}
	return defs
}

const muteText = (m) => (m === undefined ? '' : m ? 'Muted' : 'Unmuted')

/** All current values of one entity, keyed by variable id. */
export function entityVariableValues(inst, ent, n) {
	const s = inst.state
	const p = `${VAR_PREFIX[ent]}_${n}_`
	if (ent === 'minput') return { [`${p}name`]: s.displayName(ent, n) }
	const out = { [`${p}name`]: s.displayName(ent, n), [`${p}fader`]: fmtDb(s.getFader(ent, n)), [`${p}mute`]: muteText(s.getMute(ent, n)) }
	if (ent === 'input') out[`${p}pan`] = fmtPan(s.getPan(n))
	if (ent === 'buss') {
		out[`${p}mode`] = s.bussMode(n) === 'group' ? 'Group' : 'Aux'
		const st = s.busses.get(n)?.stereo
		out[`${p}stereo`] = st === undefined ? '' : st ? 'Stereo' : 'Mono'
	}
	return out
}

export function snapshotVariableValues(inst) {
	const s = inst.state.snapshots
	const cur = s.list.get(s.current)
	return {
		snapshot_index: s.current ?? '',
		snapshot_name: cur?.name ?? '',
		snapshot_cue: cur ? fmtCue(cur.cue) : '',
		snapshot_count: s.count ?? s.list.size,
	}
}

/** Everything, after the definitions were rebuilt. */
export function getAllVariableValues(inst) {
	const s = inst.state
	const out = { console_name: s.console.name, session_name: s.console.session, connected: inst.connectedFlag ? 'Yes' : 'No', fades_running: inst.fades?.size ?? 0, ...snapshotVariableValues(inst) }
	for (const ent of Object.keys(ENTITY_VARS)) for (const n of s.numbers(ent)) Object.assign(out, entityVariableValues(inst, ent, n))
	return out
}

/** Variable values affected by one event; {} when none. */
export function getEventVariableValues(inst, ev) {
	switch (ev.kind) {
		case 'consoleName':
			return { console_name: ev.value }
		case 'session':
			return { session_name: ev.value }
		case 'name':
		case 'fader':
		case 'mute':
		case 'pan':
			return entityVariableValues(inst, ev.ent, ev.n)
		case 'snapCurrent':
		case 'snapName':
		case 'snapCount':
			return snapshotVariableValues(inst)
		case 'bussTypes':
		case 'bussModes': {
			// stereo / mono (and aux / group) for every buss; no definition rebuild for a stereo flag alone
			const out = {}
			for (const n of inst.state.existing('buss')) Object.assign(out, entityVariableValues(inst, 'buss', n))
			return out
		}
		default:
			return {}
	}
}

/** Short text for last_change, or '' when the event is not worth showing. */
export function describeChange(inst, ev) {
	const s = inst.state
	const who = (ent, n) => `${ENT_LABEL[ent]} ${n} (${s.displayName(ent, n)})`
	switch (ev.kind) {
		case 'fader':
			return `${who(ev.ent, ev.n)} fader ${fmtDb(ev.value)}`
		case 'mute':
			return `${who(ev.ent, ev.n)} ${ev.value ? 'muted' : 'unmuted'}`
		case 'solo':
			return `${who(ev.ent, ev.n)} solo ${ev.value ? 'on' : 'off'}`
		case 'pan':
			return `${who(ev.ent, ev.n)} pan ${fmtPan(ev.value)}`
		case 'send':
			return `Input ${ev.ch} send ${ev.buss} ${ev.field} ${ev.field === 'level' ? fmtDb(ev.value) : ev.value}`
		case 'group':
			return `Input ${ev.ch} group ${ev.buss} ${ev.value ? 'assigned' : 'unassigned'}`
		case 'snapCurrent':
			return `Snapshot ${ev.value}`
		default:
			return ''
	}
}