package service

import (
	"encoding/csv"
	"encoding/json"
	"os"

	"billai-server/model"
)

// ExtractNeedsReview 从输出文件中提取需要复核的记录
func ExtractNeedsReview(filePath string, format string) []model.ReviewRecord {
	if format == "json" {
		return extractFromJSON(filePath)
	}
	return extractFromCSV(filePath)
}

// extractFromCSV 从 CSV 文件提取需要复核的记录
func extractFromCSV(filePath string) []model.ReviewRecord {
	var records []model.ReviewRecord

	file, err := os.Open(filePath)
	if err != nil {
		return records
	}
	defer file.Close()

	reader := csv.NewReader(file)
	reader.FieldsPerRecord = -1 // 允许变长记录
	rows, err := reader.ReadAll()
	if err != nil || len(rows) < 2 {
		return records
	}

	// 找到各列的索引
	header := rows[0]
	colIdx := make(map[string]int)
	for i, col := range header {
		colIdx[col] = i
	}

	reviewIdx, ok := colIdx["复核等级"]
	if !ok {
		return records
	}

	// 提取需要复核的记录
	for _, row := range rows[1:] {
		if len(row) > reviewIdx && (row[reviewIdx] == "HIGH" || row[reviewIdx] == "LOW") {
			record := model.ReviewRecord{
				ReviewLevel: row[reviewIdx],
			}
			if idx, ok := colIdx["交易时间"]; ok && len(row) > idx {
				record.Time = row[idx]
			}
			if idx, ok := colIdx["交易分类"]; ok && len(row) > idx {
				record.Category = row[idx]
			}
			if idx, ok := colIdx["交易对方"]; ok && len(row) > idx {
				record.Merchant = row[idx]
			}
			if idx, ok := colIdx["商品说明"]; ok && len(row) > idx {
				record.Description = row[idx]
			}
			if idx, ok := colIdx["收/支"]; ok && len(row) > idx {
				record.IncomeExpense = row[idx]
			}
			if idx, ok := colIdx["金额"]; ok && len(row) > idx {
				record.Amount = row[idx]
			}
			if idx, ok := colIdx["备注"]; ok && len(row) > idx {
				record.Remark = row[idx]
			}
			records = append(records, record)
		}
	}

	return records
}

// extractFromJSON 从 JSON 文件提取需要复核的记录
func extractFromJSON(filePath string) []model.ReviewRecord {
	var records []model.ReviewRecord

	file, err := os.Open(filePath)
	if err != nil {
		return records
	}
	defer file.Close()

	var data []map[string]interface{}
	decoder := json.NewDecoder(file)
	if err := decoder.Decode(&data); err != nil {
		return records
	}

	for _, item := range data {
		reviewLevel, ok := item["复核等级"].(string)
		if !ok || (reviewLevel != "HIGH" && reviewLevel != "LOW") {
			continue
		}

		record := model.ReviewRecord{
			ReviewLevel: reviewLevel,
		}

		if v, ok := item["交易时间"].(string); ok {
			record.Time = v
		}
		if v, ok := item["交易分类"].(string); ok {
			record.Category = v
		}
		if v, ok := item["交易对方"].(string); ok {
			record.Merchant = v
		}
		if v, ok := item["商品说明"].(string); ok {
			record.Description = v
		}
		if v, ok := item["收/支"].(string); ok {
			record.IncomeExpense = v
		}
		if v, ok := item["金额"].(string); ok {
			record.Amount = v
		}
		if v, ok := item["备注"].(string); ok {
			record.Remark = v
		}

		records = append(records, record)
	}

	return records
}