export enum VowelHeight {
	Open = 'open',
	NearOpen = 'nearOpen',
	OpenMid = 'openMid',
	Mid = 'mid',
	CloseMid = 'closeMid',
	NearClose = 'nearClose',
	Close = 'close',
}
export enum VowelDepth {
	Front = 'front',
	Central = 'central',
	Back = 'back',
}
export interface VowelFeatures {
	height: VowelHeight;
	depth: VowelDepth;
	round: boolean;
	long: boolean;
	nasal: boolean;
}


// convert a vowel height/depth combo to an x/y position
// (for use in creating nicely spaced vowel inventories)
export function _vowelXY(
	height: VowelHeight, 
	depth: VowelDepth
): [number, number] {
	const y = {
		[VowelHeight.Open]: 0,
		[VowelHeight.NearOpen]: 1,
		[VowelHeight.OpenMid]: 2,
		[VowelHeight.Mid]: 3,
		[VowelHeight.CloseMid]: 4,
		[VowelHeight.NearClose]: 5,
		[VowelHeight.Close]: 6,
	}[height];

	const slope = {
		[VowelDepth.Front]: 1,
		[VowelDepth.Central]: 2,
		[VowelDepth.Back]: 3,
	}[depth];

	if (slope === 3) { return [ 0, y ]; }

	const x = (y + 2) / slope;
	return [x, y];
}


// convert a set of vowel features to an IPA representation
export function vowelFeaturesToIpa(features: VowelFeatures): string {
	const ipa = () => {
		switch (features.height) {
			case VowelHeight.Open:
			switch (features.depth) {
				case VowelDepth.Front:
				return features.round ? 'ɶ' : 'a';
				case VowelDepth.Central:
				return features.round ? 'ɞ' : 'ä';
				case VowelDepth.Back:
				return features.round ? 'ɒ' : 'ɑ';
			}

			case VowelHeight.NearOpen:
			switch (features.depth) {
				case VowelDepth.Front:
				return features.round ? 'ɶ' : 'æ';
				case VowelDepth.Central:
				return features.round ? 'ɞ' : 'ɐ';
				case VowelDepth.Back:
				return features.round ? 'ɒ' : 'ɑ';
			}

			case VowelHeight.OpenMid:
			switch (features.depth) {
				case VowelDepth.Front:
				return features.round ? 'œ' : 'ɛ';
				case VowelDepth.Central:
				return features.round ? 'ɞ' : 'ɜ';
				case VowelDepth.Back:
				return features.round ? 'ɒ' : 'ɑ';
			}

			case VowelHeight.Mid:
			switch (features.depth) {
				case VowelDepth.Front:
				return features.round ? 'ø̞' : 'e̞';
				case VowelDepth.Central:
				return features.round ? 'ɵ' : 'ə';
				case VowelDepth.Back:
				return features.round ? 'o̞' : 'ɤ̞';
			}

			case VowelHeight.CloseMid:
			switch (features.depth) {
				case VowelDepth.Front:
				return features.round ? 'ø' : 'e';
				case VowelDepth.Central:
				return features.round ? 'ɵ' : 'ɘ';
				case VowelDepth.Back:
				return features.round ? 'o' : 'ɤ';
			}

			case VowelHeight.NearClose:
			switch (features.depth) {
				case VowelDepth.Front:
				return features.round ? 'ʏ' : 'ɪ';
				case VowelDepth.Central:
				return features.round ? 'ʉ' : 'ɨ';
				case VowelDepth.Back:
				return features.round ? 'u' : 'ʊ';
			}

			case VowelHeight.Close:
			switch (features.depth) {
				case VowelDepth.Front:
				return features.round ? 'y' : 'i';
				case VowelDepth.Central:
				return features.round ? 'ʉ' : 'ɨ';
				case VowelDepth.Back:
				return features.round ? 'u' : 'ɯ';
			}

			default:
			throw new Error(`bad vowel height: ${features.height}`);
		}
	};

	const nasal = features.nasal ? '̃' : '';
	const vlong = features.long ? 'ː' : '';
	return ipa() + nasal + vlong;
}


export enum ConsonantPlace {
	Bilabial = 'bilabial',
	Labiodental = 'labiodental',
	Linguolabial = 'labiolingual',
	Dental = 'dental',
	Alveolar = 'alveolar',
	Postalveolar = 'postalveolar',
	Retroflex = 'retroflex',
	Palatal = 'palatal',
	Velar = 'velar',
	Uvular = 'uvular',
	Pharyngeal = 'pharyngeal',
	Glottal = 'glottal',
}
export enum ConsonantManner {
	Nasal = 'nasal',
	Plosive = 'plosive',
	SibilantAffricate = 'sibilantAffricate',
	NonSibilantAffricate = 'nonSibilantAffricate',
	SibilantFricative = 'sibilantFricative',
	NonSibilantFricative = 'nonSibilantFricative',
	Approximant = 'approximant',
	Tap = 'tap',
	Trill = 'trill',
	LateralAffricate = 'lateralAffricate',
	LateralFricative = 'lateralFricative',
	LateralApproximant = 'lateralApproximant',
	LateralTap = 'lateralTap',
}
export interface ConsonantFeatures {
	place: ConsonantPlace;
	manner: ConsonantManner;
	voice: boolean;
}


// convert a set of consonant features to IPA
// returns the empty string if the proposed consonant does not exist
export function consonantFeaturesToIpa(features: ConsonantFeatures): string {
	switch (features.place) {
		case ConsonantPlace.Bilabial:
		switch (features.manner) {
			case ConsonantManner.Nasal:
			return features.voice ? 'm' : 'm̥';
			case ConsonantManner.Plosive:
			return features.voice ? 'b' : 'p';
			case ConsonantManner.SibilantAffricate:
			return '';
			case ConsonantManner.NonSibilantAffricate:
			return features.voice ? 'bβ' : 'pɸ';
			case ConsonantManner.SibilantFricative:
			return '';
			case ConsonantManner.NonSibilantFricative:
			return features.voice ? 'β' : 'ɸ';
			case ConsonantManner.Approximant:
			return features.voice ? 'β̞' : '';
			case ConsonantManner.Tap:
			return features.voice ? 'ⱱ̟' : '';
			case ConsonantManner.Trill:
			return features.voice ? 'ʙ' : 'ʙ̥';
			case ConsonantManner.LateralAffricate:
			case ConsonantManner.LateralFricative:
			case ConsonantManner.LateralApproximant:
			case ConsonantManner.LateralTap:
			return '';
		}

		case ConsonantPlace.Labiodental:
		switch (features.manner) {
			case ConsonantManner.Nasal:
			return features.voice ? 'ɱ' : 'ɱ̊';
			case ConsonantManner.Plosive:
			return features.voice ? 'b̪' : 'p̪';
			case ConsonantManner.SibilantAffricate:
			return '';
			case ConsonantManner.NonSibilantAffricate:
			return features.voice ? 'b̪v' : 'p̪f';
			case ConsonantManner.SibilantFricative:
			return '';
			case ConsonantManner.NonSibilantFricative:
			return features.voice ? 'v' : 'f';
			case ConsonantManner.Approximant:
			return features.voice ? 'ʋ' : '';
			case ConsonantManner.Tap:
			return features.voice ? 'ⱱ' : '';
			case ConsonantManner.Trill:
			case ConsonantManner.LateralAffricate:
			case ConsonantManner.LateralFricative:
			case ConsonantManner.LateralApproximant:
			case ConsonantManner.LateralTap:
			return '';
		}

		case ConsonantPlace.Linguolabial:
		switch (features.manner) {
			case ConsonantManner.Nasal:
			return features.voice ? 'n̼' : '';
			case ConsonantManner.Plosive:
			return features.voice ? 'd̼' : 't̼';
			case ConsonantManner.SibilantAffricate:
			case ConsonantManner.NonSibilantAffricate:
			case ConsonantManner.SibilantFricative:
			return '';
			case ConsonantManner.NonSibilantFricative:
			return features.voice ? 'ð̼' : 'θ̼';
			case ConsonantManner.Approximant:
			return '';
			case ConsonantManner.Tap:
			return features.voice ? 'ɾ̼' : '';
			case ConsonantManner.Trill:
			case ConsonantManner.LateralAffricate:
			case ConsonantManner.LateralFricative:
			case ConsonantManner.LateralApproximant:
			case ConsonantManner.LateralTap:
			return '';
		}

		case ConsonantPlace.Dental:
		switch (features.manner) {
			case ConsonantManner.Nasal:
			return features.voice ? 'n' : 'n̥';
			case ConsonantManner.Plosive:
			return features.voice ? 'd̪' : 't̪';
			case ConsonantManner.SibilantAffricate:
			return features.voice ? 'd̪z̪' : 't̪s̪';
			case ConsonantManner.NonSibilantAffricate:
			return features.voice ? 'd̪ð' : 't̪θ';
			case ConsonantManner.SibilantFricative:
			return features.voice ? 'z' : 's';
			case ConsonantManner.NonSibilantFricative:
			return features.voice ? 'ð' : 'θ';
			case ConsonantManner.Approximant:
			return features.voice ? 'ð̞' : '';
			case ConsonantManner.Tap:
			return features.voice ? 'ɾ' : 'ɾ̥';
			case ConsonantManner.Trill:
			return features.voice ? 'r' : 'r̥';
			case ConsonantManner.LateralAffricate:
			return features.voice ? 'dɮ' : 'tɬ';
			case ConsonantManner.LateralFricative:
			return features.voice ? 'ɮ' : 'ɬ';
			case ConsonantManner.LateralApproximant:
			return features.voice ? 'l̪' : '';
			case ConsonantManner.LateralTap:
			return features.voice ? 'ɺ' : 'ɺ̥';
		}

		case ConsonantPlace.Alveolar:
		switch (features.manner) {
			case ConsonantManner.Nasal:
			return features.voice ? 'n' : 'n̥';
			case ConsonantManner.Plosive:
			return features.voice ? 'd' : 't';
			case ConsonantManner.SibilantAffricate:
			return features.voice ? 'dz' : 'ts';
			case ConsonantManner.NonSibilantAffricate:
			return features.voice ? 'dɹ̝' : 'tɹ̝̊';
			case ConsonantManner.SibilantFricative:
			return features.voice ? 'z' : 's';
			case ConsonantManner.NonSibilantFricative:
			return features.voice ? 'ð̠' : 'θ̠';
			case ConsonantManner.Approximant:
			return features.voice ? 'ɹ' : '';
			case ConsonantManner.Tap:
			return features.voice ? 'ɾ' : 'ɾ̥';
			case ConsonantManner.Trill:
			return features.voice ? 'r' : 'r̥';
			case ConsonantManner.LateralAffricate:
			return features.voice ? 'dɮ' : 'tɬ';
			case ConsonantManner.LateralFricative:
			return features.voice ? 'ɮ' : 'ɬ';
			case ConsonantManner.LateralApproximant:
			return features.voice ? 'l' : '';
			case ConsonantManner.LateralTap:
			return features.voice ? 'ɺ' : 'ɺ̥';
		}

		case ConsonantPlace.Postalveolar:
		switch (features.manner) {
			case ConsonantManner.Nasal:
			return features.voice ? 'n' : 'n̥';
			case ConsonantManner.Plosive:
			return features.voice ? 'd' : 't';
			case ConsonantManner.SibilantAffricate:
			return features.voice ? 'd̠ʒ' : 't̠ʃ';
			case ConsonantManner.NonSibilantAffricate:
			return features.voice ? 'd̠ɹ̠˔' : 't̠ɹ̠̊˔';
			case ConsonantManner.SibilantFricative:
			return features.voice ? 'ʒ' : 'ʃ';
			case ConsonantManner.NonSibilantFricative:
			return features.voice ? 'ɹ̠˔' : 'ɹ̠̊˔';
			case ConsonantManner.Approximant:
			return features.voice ? 'ɹ̠' : '';
			case ConsonantManner.Tap:
			return features.voice ? 'r̠' : 'ɾ̥';
			case ConsonantManner.Trill:
			return features.voice ? 'r' : 'r̥';
			case ConsonantManner.LateralAffricate:
			return features.voice ? 'dɮ' : 'tɬ';
			case ConsonantManner.LateralFricative:
			return features.voice ? 'ɮ' : 'ɬ';
			case ConsonantManner.LateralApproximant:
			return features.voice ? 'l̠' : '';
			case ConsonantManner.LateralTap:
			return features.voice ? 'ɺ' : 'ɺ̥';
		}

		case ConsonantPlace.Retroflex:
		switch (features.manner) {
			case ConsonantManner.Nasal:
			return features.voice ? 'ɳ' : 'ɳ̊';
			case ConsonantManner.Plosive:
			return features.voice ? 'ɖ' : 'ʈ';
			case ConsonantManner.SibilantAffricate:
			return features.voice ? 'dʐ' : 'tʂ';
			case ConsonantManner.NonSibilantAffricate:
			return '';
			case ConsonantManner.SibilantFricative:
			return features.voice ? 'ʐ' : 'ʂ';
			case ConsonantManner.NonSibilantFricative:
			return features.voice ? 'ɻ˔' : 'ɻ̊˔';
			case ConsonantManner.Approximant:
			return features.voice ? 'ɻ' : '';
			case ConsonantManner.Tap:
			return features.voice ? 'ɽ' : 'ɽ̊';
			case ConsonantManner.Trill:
			return features.voice ? 'ɽr' : 'ɽ̊r̥';
			case ConsonantManner.LateralAffricate:
			return features.voice ? 'd𝼅' : 'tꞎ';
			case ConsonantManner.LateralFricative:
			return features.voice ? '𝼅' : 'ꞎ';
			case ConsonantManner.LateralApproximant:
			return features.voice ? 'ɭ' : '';
			case ConsonantManner.LateralTap:
			return features.voice ? '𝼈' : '𝼈̥';
		}

		case ConsonantPlace.Palatal:
		switch (features.manner) {
			case ConsonantManner.Nasal:
			return features.voice ? 'ɲ' : 'ɲ̊';
			case ConsonantManner.Plosive:
			return features.voice ? 'ɟ' : 'c';
			case ConsonantManner.SibilantAffricate:
			return features.voice ? 'dʑ' : 'tɕ';
			case ConsonantManner.NonSibilantAffricate:
			return features.voice ? 'ɟʝ' : 'cç';
			case ConsonantManner.SibilantFricative:
			return features.voice ? 'ʑ' : 'ɕ';
			case ConsonantManner.NonSibilantFricative:
			return features.voice ? 'ʝ' : 'ç';
			case ConsonantManner.Approximant:
			return features.voice ? 'j' : '';
			case ConsonantManner.Tap:
			case ConsonantManner.Trill:
			return '';
			case ConsonantManner.LateralAffricate:
			return features.voice ? 'ɟʎ̝' : 'c𝼆';
			case ConsonantManner.LateralFricative:
			return features.voice ? 'ʎ̝' : '𝼆';
			case ConsonantManner.LateralApproximant:
			return features.voice ? 'ʎ' : '';
			case ConsonantManner.LateralTap:
			return features.voice ? 'ʎ̆' : '';
		}

		case ConsonantPlace.Velar:
		switch (features.manner) {
			case ConsonantManner.Nasal:
			return features.voice ? 'ŋ' : 'ŋ̊';
			case ConsonantManner.Plosive:
			return features.voice ? 'g' : 'k';
			case ConsonantManner.SibilantAffricate:
			return '';
			case ConsonantManner.NonSibilantAffricate:
			return features.voice ? 'ɡɣ' : 'kx';
			case ConsonantManner.SibilantFricative:
			return '';
			case ConsonantManner.NonSibilantFricative:
			return features.voice ? 'ɣ' : 'x';
			case ConsonantManner.Approximant:
			return features.voice ? 'ɰ' : '';
			case ConsonantManner.Tap:
			case ConsonantManner.Trill:
			return '';
			case ConsonantManner.LateralAffricate:
			return features.voice ? 'ɡʟ̝' : 'k𝼄';
			case ConsonantManner.LateralFricative:
			return features.voice ? 'ʟ̝' : '𝼄';
			case ConsonantManner.LateralApproximant:
			return features.voice ? 'ʟ' : '';
			case ConsonantManner.LateralTap:
			return features.voice ? 'ʟ̆' : '';
		}

		case ConsonantPlace.Uvular:
		switch (features.manner) {
			case ConsonantManner.Nasal:
			return features.voice ? 'ɴ' : 'ɴ̥';
			case ConsonantManner.Plosive:
			return features.voice ? 'ɢ' : 'q';
			case ConsonantManner.SibilantAffricate:
			return '';
			case ConsonantManner.NonSibilantAffricate:
			return features.voice ? 'ɢʁ' : 'qχ';
			case ConsonantManner.SibilantFricative:
			return '';
			case ConsonantManner.NonSibilantFricative:
			return features.voice ? 'ʁ' : 'χ';
			case ConsonantManner.Approximant:
			return features.voice ? 'ʁ̞' : '';
			case ConsonantManner.Tap:
			return features.voice ? 'ɢ̆' : '';
			case ConsonantManner.Trill:
			return features.voice ? 'ʀ' : 'ʀ̥';
			case ConsonantManner.LateralAffricate:
			case ConsonantManner.LateralFricative:
			return '';
			case ConsonantManner.LateralApproximant:
			return features.voice ? 'ʟ̠' : '';
			case ConsonantManner.LateralTap:
			return '';
		}

		case ConsonantPlace.Pharyngeal:
		switch (features.manner) {
			case ConsonantManner.Nasal:
			return '';
			case ConsonantManner.Plosive:
			return features.voice ? '' : 'ʡ';
			case ConsonantManner.SibilantAffricate:
			return '';
			case ConsonantManner.NonSibilantAffricate:
			return features.voice ? 'ʡʢ' : 'ʡʜ';
			case ConsonantManner.SibilantFricative:
			return '';
			case ConsonantManner.NonSibilantFricative:
			return features.voice ? 'ʕ' : 'ħ';
			case ConsonantManner.Approximant:
			return '';
			case ConsonantManner.Tap:
			return features.voice ? 'ʡ̆' : '';
			case ConsonantManner.Trill:
			return features.voice ? 'ʢ' : 'ʜ';
			case ConsonantManner.LateralAffricate:
			case ConsonantManner.LateralFricative:
			case ConsonantManner.LateralApproximant:
			case ConsonantManner.LateralTap:
			return '';
		}

		case ConsonantPlace.Glottal:
		switch (features.manner) {
			case ConsonantManner.Nasal:
			return '';
			case ConsonantManner.Plosive:
			return features.voice ? '' : 'ʔ';
			case ConsonantManner.SibilantAffricate:
			return '';
			case ConsonantManner.NonSibilantAffricate:
			return features.voice ? '' : 'ʔh';
			case ConsonantManner.SibilantFricative:
			return '';
			case ConsonantManner.NonSibilantFricative:
			return features.voice ? 'ɦ' : 'h';
			case ConsonantManner.Approximant:
			return features.voice ? 'ʔ̞' : '';
			case ConsonantManner.Tap:
			case ConsonantManner.Trill:
			case ConsonantManner.LateralAffricate:
			case ConsonantManner.LateralFricative:
			case ConsonantManner.LateralApproximant:
			case ConsonantManner.LateralTap:
			return '';
		}
	}
}


export function isConsonantPossible(features: ConsonantFeatures): boolean {
	return consonantFeaturesToIpa(features) !== '';
}


// get all of the consonants based on the features selected
export function pickConsonants(
	places: ConsonantPlace[],
	manners: ConsonantManner[],
	voicing: [boolean, boolean],
): ConsonantFeatures[] {
	return places.map<ConsonantFeatures[]>(
		place => manners.map<ConsonantFeatures[]>(
			manner => {
				const [ unvoiced, voiced ] = voicing;
				const result = [];
				if (unvoiced) {
					result.push({ place, manner, voice: false });
				}
				if (voiced) {
					result.push({ place, manner, voice: true });
				}
				return result;
			}
		).flat()
	).flat().filter(isConsonantPossible);
}