import { API_BASE_URL, ApiRequestError } from './auth'
import type { DimensionScore, EvaluationDetail, ScoreDetail } from './assessment'
import type { ScoreType } from './session'

type QueryValue = string | number | boolean | null | undefined

type ServerEnvelope<T> = {
	code?: string
	message?: string
	data?: T
}

export type UserProfile = {
	id: number
	username: string
	real_name: string
	phone: string
	avatar: string
	gender: number
	role_type: string
	institution: number | string | null
	institution_name: string
	department: number | string | null
	department_name: string
	title_name: string
	practice_years: string
	major: string
	training_stage: string
	learning_target: string
	competency_profile: Record<string, unknown>
	weak_dimensions: string[]
	strong_dimensions: string[]
	ai_preference: Record<string, unknown>
	total_training_count: number
	total_case_count: number
	current_level: string
	status: number
	last_login_time: string | null
	created_at: string
	updated_at: string
}

export type TrainingRecord = {
	record_id: number
	case_id: number
	case_title: string
	department: string
	trained_at: string
	score: number
	score_type: ScoreType
	evaluation_level: string
	training_mode: string
	case_type: string
}

export type TrainingRecordSummary = {
	total_cases: number
	total_hours: number
	avg_accuracy: number
}

export type TrainingRecordsResponse = {
	count: number
	next: string | null
	previous: string | null
	results: TrainingRecord[]
	summary: TrainingRecordSummary
}

export type AnalysisTrendItem = {
	label: string
	score: number
}

export type AnalysisRadarItem = {
	dimension: string
	score: number
}

export type UserAnalysis = {
	current_score: number
	score_delta_pct: number | null
	recent_trend: AnalysisTrendItem[]
	radar: AnalysisRadarItem[]
	weak_dimensions: string[]
	comment: string
}

export type CompetencyMetrics = {
	completed_cases: number
	completed_cases_week: number
	total_hours: number
	avg_score: number
	diagnosis_accuracy: number
}

export type EvaluationListItem = Partial<EvaluationDetail> & Record<string, unknown>

export type EvaluationListResponse = {
	count: number
	next: string | null
	previous: string | null
	results: EvaluationListItem[]
}

export type TrainingRecordQuery = {
	search?: string
	page?: number
}

export type EvaluationListQuery = {
	page?: number
	page_size?: number
}

export function fetchUserProfile() {
	return serverRequest<UserProfile>('/user/profile/')
}

export function fetchUserTrainingRecords(query: TrainingRecordQuery = {}) {
	return serverRequest<TrainingRecordsResponse>('/user/training-records/', {
		search: query.search,
		page: query.page
	})
}

export function fetchUserAnalysis() {
	return serverRequest<UserAnalysis>('/user/analysis/')
}

export function fetchCompetencyMetrics() {
	return serverRequest<CompetencyMetrics>('/user/competency-metrics/')
}

export async function fetchEvaluationList(query: EvaluationListQuery = {}) {
	const payload = await serverRequest<unknown>('/v1/evaluations', {
		page: query.page,
		page_size: query.page_size
	})
	return unwrapServerData<EvaluationListResponse>(payload)
}

export async function fetchServerEvaluationDetail(evaluationId: number) {
	const payload = await serverRequest<unknown>(`/v1/evaluations/${encodeURIComponent(String(evaluationId))}`)
	const data = unwrapServerData<Record<string, unknown>>(payload)
	return normalizeEvaluationDetail(data, evaluationId)
}

function serverRequest<T>(path: string, query?: Record<string, QueryValue>): Promise<T> {
	return new Promise((resolve, reject) => {
		uni.request({
			url: `${API_BASE_URL}${withQuery(path, query)}`,
			method: 'GET',
			timeout: 10000,
			header: createAuthHeaders(),
			success: response => {
				if (response.statusCode >= 200 && response.statusCode < 300) {
					resolve(response.data as T)
					return
				}

				const payload = response.data as Record<string, unknown> | undefined
				const code = typeof payload?.code === 'string' ? payload.code : undefined
				reject(new ApiRequestError(readErrorMessage(response.data, `请求失败（${response.statusCode}）`), code, response.statusCode))
			},
			fail: error => {
				reject(new ApiRequestError(error.errMsg || '无法连接服务'))
			}
		})
	})
}

function createAuthHeaders() {
	const headers: Record<string, string> = {
		'Content-Type': 'application/json',
		Accept: 'application/json'
	}
	const token = readAccessToken()
	if (token) headers.Authorization = `Bearer ${token}`
	return headers
}

function readAccessToken() {
	try {
		const token = uni.getStorageSync('clinical-thinking-access-token')
		return typeof token === 'string' ? token.trim() : ''
	} catch {
		return ''
	}
}

function withQuery(path: string, query?: Record<string, QueryValue>) {
	if (!query) return path
	const params = Object.entries(query)
		.filter(([, value]) => value !== undefined && value !== null && value !== '')
		.map(([key, value]) => `${encodeURIComponent(key)}=${encodeURIComponent(String(value))}`)
		.join('&')

	return params ? `${path}?${params}` : path
}

function readErrorMessage(data: unknown, fallback: string) {
	if (data && typeof data === 'object') {
		const payload = data as Record<string, unknown>
		const message = payload.message || payload.detail || payload.error
		if (typeof message === 'string' && message.trim()) return message
	}
	return fallback
}

function unwrapServerData<T>(payload: unknown): T {
	if (payload && typeof payload === 'object' && 'data' in payload) {
		const envelope = payload as ServerEnvelope<T>
		if (envelope.code && envelope.code !== 'OK' && envelope.code !== 'ok') {
			throw new ApiRequestError(envelope.message || '请求失败', envelope.code)
		}
		if (envelope.data !== undefined) return envelope.data
	}

	return payload as T
}

function normalizeEvaluationDetail(data: Record<string, unknown>, fallbackId: number): EvaluationDetail {
	const caseInfo = isRecord(data.case) ? data.case : {}
	const totalScore = readNumber(data.total_score ?? data.score ?? data.current_score, 0)

	return {
		evaluation_id: readNumber(data.evaluation_id ?? data.id ?? data.record_id, fallbackId),
		session_id: readNumber(data.session_id, 0),
		case_id: readNumber(data.case_id ?? caseInfo.id, 0),
		case_title: readString(data.case_title ?? data.caseTitle ?? caseInfo.title, '未命名病例'),
		score_type: readScoreType(data.score_type),
		total_score: totalScore,
		dimension_scores: normalizeDimensionScores(data.dimension_scores ?? data.radar),
		score_details: normalizeScoreDetails(data.score_details),
		overall_comment: readString(data.overall_comment ?? data.comment, '本次评价暂无详细点评。'),
		pdf_file_path: readOptionalString(data.pdf_file_path ?? data.pdfFilePath),
		created_at: readOptionalString(data.created_at ?? data.trained_at)
	}
}

function normalizeDimensionScores(value: unknown): DimensionScore[] {
	if (!Array.isArray(value)) return []
	return value.map(item => {
		const record = isRecord(item) ? item : {}
		return {
			dimension: readString(record.dimension ?? record.label, '未命名维度'),
			score: readNumber(record.score, 0),
			max_score: readNumber(record.max_score, 100),
			comment: readOptionalString(record.comment),
			evidence: Array.isArray(record.evidence) ? record.evidence.map(String) : undefined,
			deductions: Array.isArray(record.deductions) ? record.deductions.map(String) : undefined,
			improvement: readOptionalString(record.improvement)
		}
	})
}

function normalizeScoreDetails(value: unknown): ScoreDetail[] {
	if (!Array.isArray(value)) return []
	return value.map(item => {
		const record = isRecord(item) ? item : {}
		return {
			dimension: readString(record.dimension, '未命名维度'),
			score: readNumber(record.score, 0),
			deducted_reason: readOptionalString(record.deducted_reason),
			ai_confidence: record.ai_confidence === undefined ? undefined : readNumber(record.ai_confidence, 0),
			comment: readOptionalString(record.comment)
		}
	})
}

function readScoreType(value: unknown): ScoreType {
	return value === 'five_point' ? 'five_point' : 'percentage'
}

function readNumber(value: unknown, fallback = 0) {
	const numberValue = Number(value)
	return Number.isFinite(numberValue) ? numberValue : fallback
}

function readString(value: unknown, fallback = '') {
	if (typeof value === 'string') return value.trim() || fallback
	if (typeof value === 'number') return String(value)
	return fallback
}

function readOptionalString(value: unknown) {
	const text = readString(value)
	return text || undefined
}

function isRecord(value: unknown): value is Record<string, unknown> {
	return Boolean(value && typeof value === 'object' && !Array.isArray(value))
}