/**
 * 会话消息：拉取历史、加载更多、发文字、发文件
 */
import {
	getMessages,
	sendMessage as apiSendMessage,
	uploadFile,
	getToken,
	getContentType,
	getUserIdFromToken,
	normalizeMessageContentType
} from '../utils/api'
import { chatStore } from '../store/chat'

/**
 * 归一化单条消息。若后端未返回 is_me，则用 currentUserId 与 sender_id 计算
 * @param {object} m - 原始消息
 * @param {string} [currentUserId] - 当前登录用户 ID，用于推算 isMe
 */
function normalizeMessage(m, currentUserId) {
	if (!m) return null
	const type = m.type ?? 'MESSAGE'
	let isMe = m.is_me ?? m.isMe
	if (isMe === undefined && currentUserId != null && currentUserId !== '') {
		const senderId = m.sender_id ?? m.senderId
		isMe = String(senderId) === String(currentUserId)
	}
	const rawText = m.content ?? m.text ?? ''
	const urlField = m.url ?? m.file_url ?? m.content_url
	const content =
		urlField && /^https?:\/\//i.test(String(urlField)) ? String(urlField) : String(rawText)
	return {
		id: String(m.id),
		type,
		senderId: m.sender_id ?? m.senderId,
		receiverId: m.receiver_id ?? m.receiverId,
		content,
		contentType: normalizeMessageContentType(m.content_type ?? m.contentType ?? 'TEXT'),
		title: m.title,
		createdAt: m.created_at ?? m.createdAt,
		isMe: !!isMe,
		actionUrl: m.action_url ?? m.actionUrl,
		actionText: m.action_text ?? m.actionText
	}
}

function normalizeMessageList(list, currentUserId) {
	return (list || []).map((m) => normalizeMessage(m, currentUserId)).filter(Boolean)
}

/**
 * 拉取某会话最新一页历史（与聊天页 fetchMessages 同源逻辑）。
 * 供 WebSocket 重连后补拉断线期间消息，避免仅依赖推送延迟。
 */
export async function fetchMessagesForContact(contactId) {
	const token = getToken()
	if (!token) return
	const currentUserId = getUserIdFromToken(token)
	try {
		const data = await getMessages(token, contactId, { skip: 0, limit: 50 })
		const list = Array.isArray(data) ? data : (data.messages || data.list || data.items || [])
		chatStore.setMessagesForContact(contactId, normalizeMessageList(list, currentUserId))
		chatStore.markContactLoaded(contactId)
	} catch (e) {
		chatStore.setMessagesForContact(contactId, [])
	}
}

export function useMessages() {
	async function fetchMessages(contactId) {
		return fetchMessagesForContact(contactId)
	}

	async function fetchMoreMessages(contactId) {
		const list = chatStore.messages[String(contactId)] || []
		const skip = list.length
		const token = getToken()
		if (!token) return
		chatStore.loadingMore[String(contactId)] = true
		try {
			const currentUserId = getUserIdFromToken(token)
			const data = await getMessages(token, contactId, { skip, limit: 50 })
			const more = Array.isArray(data) ? data : (data.messages || data.list || data.items || [])
			if (more.length) chatStore.prependMessages(contactId, normalizeMessageList(more, currentUserId))
		} catch (e) {
			// 静默失败
		} finally {
			chatStore.loadingMore[String(contactId)] = false
		}
	}

	async function sendMessage(contactId, content) {
		const text = (content || '').trim()
		if (!text) return
		const token = getToken()
		if (!token) {
			uni.showToast({ title: '请先登录', icon: 'none' })
			return
		}
		const cid = String(contactId)
		const tempId = 'temp-' + Date.now()
		const tempMsg = {
			id: tempId,
			tempId,
			senderId: null,
			content: text,
			contentType: 'TEXT',
			createdAt: new Date().toISOString(),
			isMe: true,
			status: 'sending'
		}
		chatStore.appendMessage(cid, tempMsg)
		try {
			const res = await apiSendMessage(token, cid, text, 'TEXT')
			const raw = (res && (res.data ?? res.message ?? res)) || res
			const currentUserId = getUserIdFromToken(token)
			const serverMsg = normalizeMessage(typeof raw === 'object' && raw !== null ? raw : null, currentUserId)
			const hasValidId = serverMsg && serverMsg.id && String(serverMsg.id) !== 'undefined'
			if (hasValidId) {
				const finalMsg = serverMsg.content != null && serverMsg.content !== ''
					? serverMsg
					: { ...serverMsg, content: text, contentType: 'TEXT' }
				chatStore.replaceTempMessage(cid, tempId, finalMsg)
			} else {
				chatStore.updateMessage(cid, tempId, { status: 'sent' })
			}
		} catch (e) {
			chatStore.updateMessage(cid, tempId, { status: 'failed' })
			const errMsg = (e && (e.message || e.errMsg)) || '发送失败'
			uni.showToast({ title: errMsg, icon: 'none', duration: 3000 })
		}
	}

	async function retrySendMessage(contactId, msg) {
		if (!msg || !msg.tempId || msg.status !== 'failed') return
		const text = (msg.content || '').trim()
		if (!text) return
		const token = getToken()
		if (!token) {
			uni.showToast({ title: '请先登录', icon: 'none' })
			return
		}
		const cid = String(contactId)
		chatStore.updateMessage(cid, msg.tempId, { status: 'sending' })
		try {
			const res = await apiSendMessage(token, cid, text, 'TEXT')
			const raw = (res && (res.data ?? res.message ?? res)) || res
			const currentUserId = getUserIdFromToken(token)
			const serverMsg = normalizeMessage(typeof raw === 'object' && raw !== null ? raw : null, currentUserId)
			const hasValidId = serverMsg && serverMsg.id && String(serverMsg.id) !== 'undefined'
			if (hasValidId) {
				const finalMsg = serverMsg.content != null && serverMsg.content !== ''
					? serverMsg
					: { ...serverMsg, content: text, contentType: 'TEXT' }
				chatStore.replaceTempMessage(cid, msg.tempId, finalMsg)
			} else {
				chatStore.updateMessage(cid, msg.tempId, { status: 'sent' })
			}
		} catch (e) {
			chatStore.updateMessage(cid, msg.tempId, { status: 'failed' })
			const errMsg = (e && (e.message || e.errMsg)) || '发送失败'
			uni.showToast({ title: errMsg, icon: 'none', duration: 3000 })
		}
	}

	async function sendFileMessage(contactId, filePath, contentType, fileName, onProgress) {
		const token = getToken()
		if (!token) {
			uni.showToast({ title: '请先登录', icon: 'none' })
			return
		}
		const cid = String(contactId)
		const apiCt = normalizeMessageContentType(contentType)
		const displayTitle =
			(fileName && String(fileName).trim()) ||
			(apiCt === 'IMAGE' ? '图片' : apiCt === 'VIDEO' ? '视频' : '文件')
		const tempId = 'temp-' + Date.now()
		const tempMsg = {
			id: tempId,
			tempId,
			senderId: null,
			content: filePath,
			contentType: apiCt,
			title: displayTitle,
			createdAt: new Date().toISOString(),
			isMe: true,
			status: 'sending',
			localFilePath: filePath,
			uploadProgress: 0
		}
		chatStore.appendMessage(cid, tempMsg)
		try {
			const uploadResult = await uploadFile(token, filePath, fileName, (p) => {
				if (typeof p === 'number' && p >= 0 && p <= 1) {
					chatStore.updateMessage(cid, tempId, { uploadProgress: p })
				}
				if (typeof onProgress === 'function') onProgress(p)
			})
			const key = uploadResult.key || uploadResult.file_key
			const name = (fileName && String(fileName).trim()) || uploadResult.filename || displayTitle
			if (!key) throw new Error('上传未返回 key')
			const res = await apiSendMessage(token, cid, key, apiCt, name)
			const raw = (res && (res.data ?? res.message ?? res)) || res
			const currentUserId = getUserIdFromToken(token)
			const serverMsg = normalizeMessage(typeof raw === 'object' && raw !== null ? raw : null, currentUserId)
			const hasValidId = serverMsg && serverMsg.id && String(serverMsg.id) !== 'undefined'
			if (hasValidId) {
				const finalMsg =
					serverMsg.content != null && String(serverMsg.content) !== ''
						? serverMsg
						: { ...serverMsg, content: key, contentType: apiCt, title: name }
				chatStore.replaceTempMessage(cid, tempId, finalMsg)
			} else {
				chatStore.updateMessage(cid, tempId, { status: 'sent', uploadProgress: undefined })
			}
		} catch (e) {
			chatStore.updateMessage(cid, tempId, { status: 'failed', uploadProgress: undefined })
			const errMsg = (e && (e.message || e.errMsg)) || '发送失败'
			uni.showToast({ title: errMsg, icon: 'none', duration: 3000 })
		}
	}

	async function retrySendFileMessage(contactId, msg) {
		if (!msg || !msg.tempId || msg.status !== 'failed' || !msg.localFilePath) return
		const token = getToken()
		if (!token) {
			uni.showToast({ title: '请先登录', icon: 'none' })
			return
		}
		const cid = String(contactId)
		const tempId = msg.tempId
		const apiCt = normalizeMessageContentType(msg.contentType)
		const displayTitle = (msg.title && String(msg.title).trim()) || (apiCt === 'IMAGE' ? '图片' : apiCt === 'VIDEO' ? '视频' : '文件')
		chatStore.updateMessage(cid, tempId, { status: 'sending', uploadProgress: 0 })
		try {
			const uploadResult = await uploadFile(token, msg.localFilePath, undefined, (p) => {
				if (typeof p === 'number' && p >= 0 && p <= 1) {
					chatStore.updateMessage(cid, tempId, { uploadProgress: p })
				}
			})
			const key = uploadResult.key || uploadResult.file_key
			const name = uploadResult.filename || displayTitle
			if (!key) throw new Error('上传未返回 key')
			const res = await apiSendMessage(token, cid, key, apiCt, name)
			const raw = (res && (res.data ?? res.message ?? res)) || res
			const currentUserId = getUserIdFromToken(token)
			const serverMsg = normalizeMessage(typeof raw === 'object' && raw !== null ? raw : null, currentUserId)
			const hasValidId = serverMsg && serverMsg.id && String(serverMsg.id) !== 'undefined'
			if (hasValidId) {
				const finalMsg =
					serverMsg.content != null && String(serverMsg.content) !== ''
						? serverMsg
						: { ...serverMsg, content: key, contentType: apiCt, title: name }
				chatStore.replaceTempMessage(cid, tempId, finalMsg)
			} else {
				chatStore.updateMessage(cid, tempId, { status: 'sent', uploadProgress: undefined })
			}
		} catch (e) {
			chatStore.updateMessage(cid, tempId, { status: 'failed', uploadProgress: undefined })
			const errMsg = (e && (e.message || e.errMsg)) || '发送失败'
			uni.showToast({ title: errMsg, icon: 'none', duration: 3000 })
		}
	}

	/** 再次提醒：向对方重发一条相同结构的 USER_NOTIFICATION */
	async function remindUserNotification(contactId, sourceMsg) {
		if (!sourceMsg || sourceMsg.tempId) return
		const token = getToken()
		if (!token) {
			uni.showToast({ title: '请先登录', icon: 'none' })
			return
		}
		const cid = String(contactId)
		const tempId = 'temp-' + Date.now()
		const content = sourceMsg.content != null ? String(sourceMsg.content) : ''
		const title =
			sourceMsg.title != null && sourceMsg.title !== '' ? String(sourceMsg.title) : undefined
		const tempMsg = {
			id: tempId,
			tempId,
			senderId: null,
			type: 'MESSAGE',
			content,
			contentType: 'USER_NOTIFICATION',
			title: sourceMsg.title,
			actionUrl: sourceMsg.actionUrl,
			actionText: sourceMsg.actionText,
			createdAt: new Date().toISOString(),
			isMe: true,
			status: 'sending'
		}
		chatStore.appendMessage(cid, tempMsg)
		try {
			const res = await apiSendMessage(token, cid, content, 'USER_NOTIFICATION', title, {
				action_url: sourceMsg.actionUrl,
				action_text: sourceMsg.actionText
			})
			const raw = (res && (res.data ?? res.message ?? res)) || res
			const currentUserId = getUserIdFromToken(token)
			const serverMsg = normalizeMessage(typeof raw === 'object' && raw !== null ? raw : null, currentUserId)
			const hasValidId = serverMsg && serverMsg.id && String(serverMsg.id) !== 'undefined'
			if (hasValidId) {
				const finalMsg =
					serverMsg.contentType === 'USER_NOTIFICATION'
						? serverMsg
						: { ...serverMsg, contentType: 'USER_NOTIFICATION', content, title: sourceMsg.title }
				chatStore.replaceTempMessage(cid, tempId, finalMsg)
			} else {
				chatStore.updateMessage(cid, tempId, { status: 'sent' })
			}
		} catch (e) {
			chatStore.removeMessage(cid, tempId)
			const errMsg = (e && (e.message || e.errMsg)) || '发送失败'
			uni.showToast({ title: errMsg, icon: 'none', duration: 3000 })
		}
	}

	return {
		messages: chatStore.messages,
		loadingMore: chatStore.loadingMore,
		fetchMessages,
		fetchMoreMessages,
		sendMessage,
		retrySendMessage,
		sendFileMessage,
		retrySendFileMessage,
		remindUserNotification,
		hasContactLoaded: (id) => chatStore.hasContactLoaded(id),
		getContentType
	}
}