import { createJavaFormatter, type JavaRecipeFormatter } from './formatter.ts'
import { fullId, parseIdentifier } from './identifier.ts'
import type {
	JavaVersionId,
	RecipeSlot,
	RecipeSlotContext,
	RecipeState,
	SlotValue,
} from './types.ts'
import {
	DEFAULT_COOKING_TIME,
	isVersionAtLeast,
	supportsRecipeCategory,
	supportsShowNotification,
	supportsSmithingTrimPattern,
} from './versions.ts'

export const CRAFTING_GRID_SLOTS: readonly RecipeSlot[] = [
	'crafting.1',
	'crafting.2',
	'crafting.3',
	'crafting.4',
	'crafting.5',
	'crafting.6',
	'crafting.7',
	'crafting.8',
	'crafting.9',
]

const TWO_BY_TWO_DISABLED_INDICES = new Set([2, 5, 6, 7, 8])

const PATTERN_CHARACTERS = ['#', ...'ABCDEFGHIJKLMNOPQRSTUVWXYZ', ...'abcdefghijklmnopqrstuvwxyz']

const DINNERBONE_RULES: { char: string; keywords: string[] }[] = [
	{ char: '/', keywords: ['stick', 'rod', 'torch', 'arrow', 'bone'] },
	{ char: '_', keywords: ['slab', 'carpet', 'paper', 'map'] },
	{ char: '=', keywords: ['ingot', 'brick'] },
	{ char: '.', keywords: ['nugget', 'dust', 'powder', 'seed', 'redstone'] },
	{ char: 'o', keywords: ['diamond', 'emerald', 'quartz', 'shard', 'pearl', 'ball', 'egg'] },
	{ char: '~', keywords: ['string', 'vine'] },
	{ char: ')', keywords: ['bow'] },
	{ char: 'u', keywords: ['bucket', 'bottle'] },
]

export type ResolvedSlotValue = {
	ref: ReturnType<typeof parseIdentifier>
	isTag: boolean
}

export function resolveSlotValue(
	value: SlotValue | undefined,
	ctx: RecipeSlotContext,
): ResolvedSlotValue | undefined {
	if (!value) return undefined
	switch (value.kind) {
		case 'item':
			return { ref: parseIdentifier(value.id), isTag: false }
		case 'vanilla_tag':
			return { ref: parseIdentifier(value.id), isTag: true }
		case 'custom_item': {
			const custom = ctx.customItemsByUid[value.uid]
			return custom ? { ref: parseIdentifier(custom.id), isTag: false } : undefined
		}
		case 'custom_tag': {
			const custom = ctx.customTagsByUid[value.uid]
			return custom ? { ref: parseIdentifier(custom.id), isTag: true } : undefined
		}
	}
}

export function slotCount(value: SlotValue | undefined): number | undefined {
	return value && (value.kind === 'item' || value.kind === 'custom_item') ? value.count : undefined
}

function dinnerboneChallenge(path: string, isTag: boolean): string | null {
	if (isTag) return null
	const normalized = path.toLowerCase()
	for (const rule of DINNERBONE_RULES) {
		if (rule.keywords.some((keyword) => normalized.includes(keyword))) return rule.char
	}
	return null
}

function pickKeyName(
	path: string,
	value: SlotValue,
	ctx: RecipeSlotContext,
	usedKeys: Set<string>,
): string {
	const resolved = resolveSlotValue(value, ctx)
	const candidates = [dinnerboneChallenge(path, resolved?.isTag === true)]
	for (const word of path.match(/[a-zA-Z]+/g) ?? []) {
		candidates.push(word[0].toUpperCase(), word[0].toLowerCase())
	}
	for (const letter of path.match(/[a-zA-Z]/g) ?? []) {
		candidates.push(letter.toUpperCase(), letter.toLowerCase())
	}
	for (const candidate of candidates) {
		if (candidate && !usedKeys.has(candidate)) return candidate
	}
	const next = PATTERN_CHARACTERS.find((candidate) => !usedKeys.has(candidate))
	if (!next) throw new Error('Ran out of pattern characters')
	return next
}

function resolveKeyInfo(
	value: SlotValue,
	ctx: RecipeSlotContext,
): { reverseKey: string; path: string } {
	const resolved = resolveSlotValue(value, ctx)
	if (resolved) return { reverseKey: fullId(resolved.ref), path: resolved.ref.id }
	const uid = value.kind === 'custom_item' || value.kind === 'custom_tag' ? value.uid : ''
	return { reverseKey: `${value.kind}:${uid}`, path: uid }
}

export function assignCraftingKeys(
	grid: (SlotValue | undefined)[],
	ctx: RecipeSlotContext,
): { key: Record<string, SlotValue>; reverse: Record<string, string> } {
	const cells: { reverseKey: string; path: string; value: SlotValue }[] = []
	const counts = new Map<string, number>()
	let primary: string | undefined
	let primaryCount = 0

	for (const value of grid) {
		if (!value) continue
		const info = resolveKeyInfo(value, ctx)
		cells.push({ reverseKey: info.reverseKey, path: info.path, value })
		const count = (counts.get(info.reverseKey) ?? 0) + 1
		counts.set(info.reverseKey, count)
		if (count > primaryCount) {
			primary = info.reverseKey
			primaryCount = count
		}
	}

	const key: Record<string, SlotValue> = {}
	const reverse: Record<string, string> = {}
	const usedKeys = new Set<string>(['#'])

	for (const cell of cells) {
		if (reverse[cell.reverseKey]) continue
		const keyName =
			cell.reverseKey === primary ? '#' : pickKeyName(cell.path, cell.value, ctx, usedKeys)
		key[keyName] = cell.value
		reverse[cell.reverseKey] = keyName
		usedKeys.add(keyName)
	}

	return { key, reverse }
}

export function buildPattern(
	grid: (SlotValue | undefined)[],
	reverse: Record<string, string>,
	ctx: RecipeSlotContext,
	keepWhitespace: boolean,
): string[] {
	const pattern: string[] = []
	for (const [index, value] of grid.entries()) {
		const rowIndex = Math.floor(index / 3)
		pattern[rowIndex] = pattern[rowIndex] ?? ''
		if (!value) {
			pattern[rowIndex] += ' '
			continue
		}
		const { reverseKey } = resolveKeyInfo(value, ctx)
		pattern[rowIndex] += reverse[reverseKey] ?? '#'
	}

	if (keepWhitespace) return pattern

	while (pattern.length > 0 && pattern[0].trim() === '') pattern.shift()
	while (pattern.length > 0 && pattern[pattern.length - 1].trim() === '') pattern.pop()
	if (pattern.length === 0) return pattern

	let minColumn = Number.POSITIVE_INFINITY
	let maxColumn = 0
	for (const row of pattern) {
		let firstNonWhitespace = -1
		let lastNonWhitespace = -1
		for (let index = 0; index < row.length; index += 1) {
			if (row[index] === ' ') continue
			if (firstNonWhitespace === -1) firstNonWhitespace = index
			lastNonWhitespace = index
		}
		if (firstNonWhitespace === -1) continue
		minColumn = Math.min(minColumn, firstNonWhitespace)
		maxColumn = Math.max(maxColumn, lastNonWhitespace + 1)
	}
	return pattern.map((row) => row.slice(minColumn, maxColumn))
}

function craftingGrid(state: RecipeState): (SlotValue | undefined)[] {
	return CRAFTING_GRID_SLOTS.map((slot, index) => {
		const value = state.slots[slot]
		if (state.crafting.twoByTwo && TWO_BY_TWO_DISABLED_INDICES.has(index)) return undefined
		return value
	})
}

function buildCrafting(
	state: RecipeState,
	version: JavaVersionId,
	ctx: RecipeSlotContext,
	fmt: JavaRecipeFormatter,
): Record<string, unknown> {
	const grid = craftingGrid(state)
	const populated = grid.filter((value): value is SlotValue => Boolean(value))
	const result = state.slots['crafting.result']
	const resolvedResult = result ? resolveSlotValue(result, ctx) : undefined
	const resultCount = slotCount(result)
	const group = state.group.length > 0 ? state.group : undefined
	const category =
		supportsRecipeCategory(version, 'crafting') && state.category.length > 0
			? state.category
			: undefined
	const showNotification =
		supportsShowNotification(version, 'crafting', state.crafting.shapeless) &&
		state.showNotification === false
			? { show_notification: false }
			: {}
	const output: Record<string, unknown> = {
		type: fmt.typeName(state.crafting.shapeless ? 'crafting_shapeless' : 'crafting_shaped'),
		...(category ? { category } : {}),
		...showNotification,
	}

	if (state.crafting.shapeless) {
		return {
			...output,
			ingredients: populated.map((value) => {
				const resolved = resolveSlotValue(value, ctx)
				return fmt.ingredient(resolved!.ref, resolved!.isTag)
			}),
			...(group ? { group } : {}),
			result:
				resolvedResult && !resolvedResult.isTag ? fmt.result(resolvedResult.ref, resultCount) : {},
		}
	}

	const { key, reverse } = assignCraftingKeys(grid, ctx)
	return {
		...output,
		pattern: buildPattern(grid, reverse, ctx, state.crafting.keepWhitespace),
		key: Object.fromEntries(
			Object.entries(key).map(([keyName, value]) => {
				const resolved = resolveSlotValue(value, ctx)
				return [keyName, fmt.ingredient(resolved!.ref, resolved!.isTag)]
			}),
		),
		...(group ? { group } : {}),
		result:
			resolvedResult && !resolvedResult.isTag ? fmt.result(resolvedResult.ref, resultCount) : {},
	}
}

function buildCooking(
	state: RecipeState,
	version: JavaVersionId,
	ctx: RecipeSlotContext,
	fmt: JavaRecipeFormatter,
	type: 'smelting' | 'blasting' | 'smoking' | 'campfire_cooking',
): Record<string, unknown> {
	const ingredient = resolveSlotValue(state.slots['cooking.ingredient'], ctx)
	const result = resolveSlotValue(state.slots['cooking.result'], ctx)
	const group = state.group.length > 0 ? state.group : undefined
	const category =
		supportsRecipeCategory(version, state.recipeType) && state.category.length > 0
			? state.category
			: undefined
	const showNotification =
		supportsShowNotification(version, state.recipeType, false) && state.showNotification === false
			? { show_notification: false }
			: {}
	return {
		type: fmt.typeName(type),
		...(category ? { category } : {}),
		...(group ? { group } : {}),
		...showNotification,
		experience: state.cooking.experience,
		cookingtime: state.cooking.time ?? DEFAULT_COOKING_TIME[type],
		ingredient: ingredient ? fmt.ingredient(ingredient.ref, ingredient.isTag) : {},
		result:
			result && !result.isTag
				? fmt.cookingResult(result.ref, slotCount(state.slots['cooking.result']))
				: {},
	}
}

function buildStonecutter(
	state: RecipeState,
	version: JavaVersionId,
	ctx: RecipeSlotContext,
	fmt: JavaRecipeFormatter,
): Record<string, unknown> {
	const ingredient = resolveSlotValue(state.slots['stonecutter.ingredient'], ctx)
	const result = resolveSlotValue(state.slots['stonecutter.result'], ctx)
	const group =
		!isVersionAtLeast(version, '26.1') && state.group.length > 0 ? state.group : undefined
	const showNotification =
		supportsShowNotification(version, 'stonecutter', false) && state.showNotification === false
			? { show_notification: false }
			: {}
	return {
		type: fmt.typeName('stonecutting'),
		...(group ? { group } : {}),
		...showNotification,
		ingredient: ingredient ? fmt.ingredient(ingredient.ref, ingredient.isTag) : {},
		...fmt.stonecutterResult(
			result?.ref ?? { namespace: 'minecraft', id: 'air' },
			slotCount(state.slots['stonecutter.result']),
		),
	}
}

function buildSmithing(
	state: RecipeState,
	version: JavaVersionId,
	ctx: RecipeSlotContext,
	fmt: JavaRecipeFormatter,
): Record<string, unknown> {
	const template = resolveSlotValue(state.slots['smithing.template'], ctx)
	const base = resolveSlotValue(state.slots['smithing.base'], ctx)
	const addition = resolveSlotValue(state.slots['smithing.addition'], ctx)
	const result = resolveSlotValue(state.slots['smithing.result'], ctx)

	if (state.recipeType === 'smithing') {
		return {
			type: fmt.typeName('smithing'),
			result: result && !result.isTag ? fmt.result(result.ref) : {},
			base: base ? fmt.ingredient(base.ref, base.isTag) : {},
			addition: addition ? fmt.ingredient(addition.ref, addition.isTag) : {},
		}
	}

	const showNotification =
		supportsShowNotification(version, state.recipeType, false) && state.showNotification === false
			? { show_notification: false }
			: {}

	if (state.recipeType === 'smithing_trim') {
		return {
			type: fmt.typeName('smithing_trim'),
			...showNotification,
			template: template ? fmt.ingredient(template.ref, template.isTag) : {},
			base: base ? fmt.ingredient(base.ref, base.isTag) : {},
			addition: addition ? fmt.ingredient(addition.ref, addition.isTag) : {},
			...(supportsSmithingTrimPattern(version) && state.smithing.trimPattern
				? { pattern: state.smithing.trimPattern }
				: {}),
		}
	}

	return {
		type: fmt.typeName('smithing_transform'),
		...showNotification,
		template: template ? fmt.ingredient(template.ref, template.isTag) : {},
		base: base ? fmt.ingredient(base.ref, base.isTag) : {},
		addition: addition ? fmt.ingredient(addition.ref, addition.isTag) : {},
		result: result && !result.isTag ? fmt.result(result.ref) : {},
	}
}

export function generateJavaRecipe(
	state: RecipeState,
	version: JavaVersionId,
	ctx: RecipeSlotContext,
): Record<string, unknown> {
	const fmt = createJavaFormatter(version)
	switch (state.recipeType) {
		case 'crafting':
			return buildCrafting(state, version, ctx, fmt)
		case 'smelting':
		case 'blasting':
		case 'smoking':
		case 'campfire_cooking':
			return buildCooking(state, version, ctx, fmt, state.recipeType)
		case 'stonecutter':
			return buildStonecutter(state, version, ctx, fmt)
		case 'smithing':
		case 'smithing_trim':
		case 'smithing_transform':
			return buildSmithing(state, version, ctx, fmt)
		default:
			throw new Error(`Unsupported recipe type: ${state.recipeType satisfies never}`)
	}
}

export function getCraftingGridValues(state: RecipeState): (SlotValue | undefined)[] {
	return craftingGrid(state)
}