import { FASTAPI_BASE_URL, authHeaders, readError, type ApiEnvelope, type ScoreType } from './session'

export type DimensionScore = {
	dimension: string
	score: number
	max_score: number
	comment?: string
	evidence?: string[]
	deductions?: string[]
	improvement?: string
}

export type ScoreDetail = {
	dimension: string
	score: number
	deducted_reason?: string
	ai_confidence?: number
	comment?: string
}

export type EvaluationResult = {
	evaluation_id: number
	score_type: ScoreType
	total_score: number
	dimension_scores: DimensionScore[]
	score_details: ScoreDetail[]
	errors: string[]
	improvement_plan: string[]
	evidence_summary: string[]
	guideline_refs: string[]
	overall_comment: string
}

export type EvaluationDetail = {
	evaluation_id: number
	session_id: number
	case_id: number
	case_title: string
	score_type: ScoreType
	total_score: number
	dimension_scores: DimensionScore[]
	score_details: ScoreDetail[]
	overall_comment: string
	pdf_file_path?: string
	created_at?: string
}

export type EvaluationPdfExport = {
	export_id: number
	file_path: string
}

export type EvaluationPdfDownload = {
	blob?: Blob
	filePath?: string
	fileName: string
}

export async function generateEvaluation(sessionId: number, scoreType: ScoreType = 'percentage') {
	const response = await fetch(`${FASTAPI_BASE_URL}/sessions/${sessionId}/evaluation`, {
		method: 'POST',
		headers: authHeaders(),
		body: JSON.stringify({
			score_type: scoreType
		})
	})

	if (!response.ok) {
		throw new Error(await readError(response))
	}

	const result = (await response.json()) as ApiEnvelope<EvaluationResult>
	if (result.code !== 'OK' || !result.data) {
		throw new Error(result.message || '评价生成失败')
	}

	return result.data
}

export async function fetchEvaluationDetail(evaluationId: number) {
	const response = await fetch(`${FASTAPI_BASE_URL}/evaluations/${evaluationId}`, {
		method: 'GET',
		headers: authHeaders()
	})

	if (!response.ok) {
		throw new Error(await readError(response))
	}

	const result = (await response.json()) as ApiEnvelope<EvaluationDetail>
	if (result.code !== 'OK' || !result.data) {
		throw new Error(result.message || '评价详情加载失败')
	}

	return result.data
}

export async function downloadEvaluationPdf(evaluationId: number): Promise<EvaluationPdfDownload> {
	const response = await fetch(`${FASTAPI_BASE_URL}/evaluations/${evaluationId}/download-pdf`, {
		method: 'GET',
		headers: authHeaders('application/pdf')
	})

	if (!response.ok) {
		throw new Error(await readError(response))
	}

	const contentType = response.headers.get('Content-Type') || ''
	const disposition = response.headers.get('Content-Disposition') || ''
	const fileName = readDownloadFileName(disposition, evaluationId)

	if (contentType.includes('application/json')) {
		const result = (await response.json()) as ApiEnvelope<EvaluationPdfExport>
		if (result.code !== 'OK' || !result.data?.file_path) {
			throw new Error(result.message || 'PDF 下载失败')
		}

		return {
			filePath: result.data.file_path,
			fileName: readFileNameFromPath(result.data.file_path, fileName)
		}
	}

	return {
		blob: await response.blob(),
		fileName
	}
}

function readDownloadFileName(disposition: string, evaluationId: number) {
	const utf8Name = disposition.match(/filename\*=UTF-8''([^;]+)/i)?.[1]
	if (utf8Name) return decodeURIComponent(utf8Name)

	const quotedName = disposition.match(/filename="?([^"]+)"?/i)?.[1]
	if (quotedName) return quotedName

	return `training_record_${evaluationId}.pdf`
}

function readFileNameFromPath(filePath: string, fallback: string) {
	const cleanPath = filePath.split('?')[0].split('#')[0]
	const name = cleanPath.split('/').filter(Boolean).pop()
	return name || fallback
}