/**
 * 铸爱 — 统一「Thinking → 选择 → 详情确认 → 铸造」路由与 Storage
 */

import {
	LENTICULAR_STUDIO_STORAGE_KEY,
	CASTLOVE_LASER_ENTRY_KEY,
} from '@/utils/castloveMintForm.js'

export const GENERATION_FLOW_KEY = 'generation_flow_payload'
export const GENERATION_REQUEST_KEY = 'generation_request_data'
export const GENERATED_IMAGES_KEY = 'generated_images'
export const GENERATION_RESULT_META_KEY = 'generation_result_meta'
export const CASTLOVE_FORM_KEY = 'castlove_form_data'
export const CRAFT_SELECTED_IMAGE_KEY = 'craft_selected_image'
export const CRAFT_SELECTED_INDEX_KEY = 'craft_selected_index'

export const FLOW_MODE_API = 'api'
export const FLOW_MODE_PREFILLED = 'prefilled'
export const FLOW_MODE_LENTICULAR = 'lenticular'
export const FLOW_MODE_LASER = 'laser'

export const AFTER_SELECT_MINT = 'mint'
export const AFTER_SELECT_DETAIL = 'detail'

export const STUDIO_LENTICULAR = 'lenticular'
export const STUDIO_LASER = 'laser'

const LOADING_URL = '/pages/discover/generation-loading'
const RESULT_URL = '/pages/discover/generation-result'
const ASSET_DETAIL_URL = '/pages/asset-detail/asset-detail'

export function padImagesForSelection(images, minCount = 4) {
	if (!Array.isArray(images) || images.length === 0) {
		return []
	}
	if (images.length >= minCount) {
		return images.slice(0, minCount)
	}
	const out = [...images]
	while (out.length < minCount) {
		out.push(images[out.length % images.length])
	}
	return out
}

function persistFormData(formData) {
	if (formData != null) {
		uni.setStorageSync(CASTLOVE_FORM_KEY, JSON.stringify(formData))
	}
}

function enrichFormData(formData, { afterSelect, studioKind } = {}) {
	const next = { ...(formData || {}) }
	if (afterSelect) {
		next.generation_after = afterSelect
	}
	if (studioKind) {
		next.studio_kind = studioKind
	}
	return next
}

export function materializeImageRef(src) {
	const s = String(src || '').trim()
	if (!s) {
		return Promise.resolve({ path: '', base64: '' })
	}
	if (s.startsWith('data:')) {
		return Promise.resolve({ path: '', base64: s })
	}
	if (s.startsWith('http://') || s.startsWith('https://')) {
		return new Promise((resolve, reject) => {
			uni.downloadFile({
				url: s,
				success: (res) => {
					if (res.statusCode === 200 && res.tempFilePath) {
						resolve({ path: res.tempFilePath, base64: '' })
					} else {
						reject(new Error('图片下载失败'))
					}
				},
				fail: (err) => reject(err || new Error('图片下载失败')),
			})
		})
	}
	return Promise.resolve({ path: s, base64: '' })
}

function navigateToLoading() {
	uni.navigateTo({ url: LOADING_URL })
}

export function startAiImageGenerationFlow({
	prompt,
	formData,
	n = 4,
	model = 'image-01',
	aspectRatio = '16:9',
	afterSelect = AFTER_SELECT_MINT,
	studioKind = '',
}) {
	const requestData = {
		prompt,
		model,
		aspect_ratio: aspectRatio,
		subject_reference: [{ type: 'character', image_file: '' }],
		n,
	}
	const merged = enrichFormData(formData, { afterSelect, studioKind })
	persistFormData(merged)
	uni.setStorageSync(GENERATION_REQUEST_KEY, JSON.stringify(requestData))
	uni.setStorageSync(
		GENERATION_FLOW_KEY,
		JSON.stringify({
			mode: FLOW_MODE_API,
			craft: merged?.craft_name || merged?.typeName || '',
			afterSelect,
			studioKind,
		})
	)
	navigateToLoading()
}

/** 光栅 / 镭射：工作台生成预览，不走通用 AI 四图 */
export function startCraftGenerationFlow({ formData, studioKind }) {
	const merged = enrichFormData(formData, {
		afterSelect: AFTER_SELECT_DETAIL,
		studioKind,
	})
	persistFormData(merged)
	uni.removeStorageSync(GENERATION_REQUEST_KEY)
	const mode =
		studioKind === STUDIO_LENTICULAR ? FLOW_MODE_LENTICULAR : FLOW_MODE_LASER
	uni.setStorageSync(
		GENERATION_FLOW_KEY,
		JSON.stringify({
			mode,
			studioKind,
			afterSelect: AFTER_SELECT_DETAIL,
			craft: merged?.craft_name || merged?.typeName || '',
			minDurationMs: 1600,
		})
	)
	navigateToLoading()
}

export function startPrefilledSelectionFlow({
	images,
	formData,
	minDurationMs = 1400,
	padToFour = true,
	afterSelect = AFTER_SELECT_MINT,
	studioKind = '',
}) {
	const list = padToFour ? padImagesForSelection(images) : images
	if (!list.length) {
		throw new Error('startPrefilledSelectionFlow: images 不能为空')
	}
	const merged = enrichFormData(formData, { afterSelect, studioKind })
	persistFormData(merged)
	uni.removeStorageSync(GENERATION_REQUEST_KEY)
	uni.setStorageSync(
		GENERATION_FLOW_KEY,
		JSON.stringify({
			mode: FLOW_MODE_PREFILLED,
			images: list,
			minDurationMs,
			craft: merged?.craft_name || merged?.typeName || '',
			afterSelect,
			studioKind,
		})
	)
	navigateToLoading()
}

export function persistLenticularPreviewMeta(formData) {
	uni.setStorageSync(
		LENTICULAR_STUDIO_STORAGE_KEY,
		JSON.stringify({
			bgPath: formData.lenticularBgImage || '',
			subjectPath: formData.lenticularSubjectImage || '',
			bgBase64: formData.lenticularBgBase64 || '',
			subjectBase64: formData.lenticularSubjectBase64 || '',
			nftInfo: formData.info || formData.nftInfo || '',
			materialTypeIndex: formData.materialTypeIndex ?? 0,
			aiDescription: formData.aiDescription || '',
		})
	)
	uni.setStorageSync(
		GENERATION_RESULT_META_KEY,
		JSON.stringify({ displayMode: STUDIO_LENTICULAR, imageCount: 1 })
	)
	uni.setStorageSync(GENERATED_IMAGES_KEY, JSON.stringify([{ type: 'lenticular' }]))
}

export function persistLaserPreviewImages(paths) {
	uni.setStorageSync(
		GENERATION_RESULT_META_KEY,
		JSON.stringify({ displayMode: STUDIO_LASER, imageCount: paths.length })
	)
	uni.setStorageSync(GENERATED_IMAGES_KEY, JSON.stringify(paths))
}

export async function completeSelectionAndOpenDetail({
	selectedImage,
	selectedIndex,
	formData,
}) {
	const img = await materializeImageRef(selectedImage)
	const storedImage = img.path || img.base64 || selectedImage
	uni.setStorageSync(CRAFT_SELECTED_IMAGE_KEY, storedImage)
	uni.setStorageSync(CRAFT_SELECTED_INDEX_KEY, String(selectedIndex ?? 0))

	if (formData?.studio_kind === STUDIO_LENTICULAR) {
		const subjectRef = storedImage
		uni.setStorageSync(
			LENTICULAR_STUDIO_STORAGE_KEY,
			JSON.stringify({
				bgPath: formData.lenticularBgImage || '',
				subjectPath: subjectRef,
				bgBase64: formData.lenticularBgBase64 || '',
				subjectBase64: img.base64 || formData.lenticularSubjectBase64 || '',
				nftInfo: formData.info || formData.nftInfo || '',
				materialTypeIndex: formData.materialTypeIndex ?? 0,
				aiDescription: formData.aiDescription || '',
			})
		)
	} else if (formData?.studio_kind === STUDIO_LASER) {
		uni.setStorageSync(
			CASTLOVE_LASER_ENTRY_KEY,
			JSON.stringify({
				nftInfo: formData.info || formData.nftInfo || '',
				materialTypes: formData.materialTypes || [],
				materialTypeIndex: formData.materialTypeIndex ?? 0,
				pageName: formData.craft_name || formData.typeName || '',
				uploadedImage: storedImage,
				uploadedImageBase64: img.base64 || formData.uploadedImageBase64 || '',
			})
		)
	}

	const kind = formData?.studio_kind || ''
	uni.navigateTo({
		url: `${ASSET_DETAIL_URL}?from=craft_confirm&studio_kind=${encodeURIComponent(kind)}`,
	})
}

export function isDetailAfterSelect(formData) {
	return formData?.generation_after === AFTER_SELECT_DETAIL
}

export function isLenticularKind(formData) {
	return formData?.studio_kind === STUDIO_LENTICULAR
}

export function isLaserKind(formData) {
	return formData?.studio_kind === STUDIO_LASER
}

export function consumeGenerationFlowPayload() {
	try {
		const raw = uni.getStorageSync(GENERATION_FLOW_KEY)
		uni.removeStorageSync(GENERATION_FLOW_KEY)
		if (!raw) {
			return null
		}
		return JSON.parse(raw)
	} catch (e) {
		console.error('[castloveGenerationFlow] consume payload', e)
		return null
	}
}

export { RESULT_URL }