package export

import (
	"database/sql"
	"io"
	"strconv"

	"github.com/xuri/excelize/v2"

	"git.yeij.top/AskaEth/Scoreboard/server/internal/domain"
)

// TeamDetailRow 是单位积分明细的一行：一分一行的得分来源。
type TeamDetailRow struct {
	SportName   string
	EventName   string
	Category    string
	AthleteName string
	Rank        int
	ResultText  string
	Source      string
	Points      float64
	Remark      string
	// individual 标记该条流水记到个人：合计要按 individual_to_team_weight 折算。
	individual bool
}

// TeamDetailWorkbook 是「单位积分明细」的内容。
type TeamDetailWorkbook struct {
	Meta Meta
	Team domain.Team
	Rows []TeamDetailRow
	// IndividualToTeamWeight 与总积分榜同源，用于把个人分折算进「合计」。
	IndividualToTeamWeight float64
}

var teamDetailColumns = []column{
	{"序号", 6, kindInt},
	{"大项", 14, kindText},
	{"小项", 18, kindText},
	{"组别", 14, kindText},
	{"运动员", 14, kindText},
	{"名次", 7, kindCenter},
	{"成绩", 12, kindCenter},
	{"来源", 12, kindCenter},
	{"积分", 8, kindNumber},
	{"备注", 20, kindText},
}

// ExportTeamDetailXLSX 导出某单位的积分明细（逐项列出得分来源）。
func ExportTeamDetailXLSX(db *sql.DB, teamID int64, dst string, opts Options) error {
	wb, err := LoadTeamDetailWorkbook(db, teamID, opts)
	if err != nil {
		return err
	}
	f, err := teamDetailFile(wb)
	if err != nil {
		return err
	}
	return saveWorkbook(f, dst)
}

// WriteTeamDetailXLSX 把单位积分明细写成 xlsx 流。
func WriteTeamDetailXLSX(w io.Writer, wb TeamDetailWorkbook) error {
	f, err := teamDetailFile(wb)
	if err != nil {
		return err
	}
	return f.Write(w)
}

func teamDetailFile(wb TeamDetailWorkbook) (*excelize.File, error) {
	return buildWorkbook("积分明细", func(f *excelize.File, st *styleSet) error {
		meta := wb.Meta.normalized()
		name := sanitizeSheetName(displayName(wb.Team.Name, wb.Team.ShortName) + "积分明细")
		if err := addSheet(f, name); err != nil {
			return err
		}
		title := sheetTitle(meta, displayName(wb.Team.Name, wb.Team.ShortName)+" · 积分明细")
		return writeSheet(f, st, name, meta, title, teamDetailColumns, teamDetailRows(wb.Rows, wb.IndividualToTeamWeight))
	})
}

// teamDetailRows 把明细行排成表格。与 REST 的单位积分明细同口径：
// 记到个人的流水按 individual_to_team_weight 折算后展示，合计即各行之和。
func teamDetailRows(rows []TeamDetailRow, weight float64) [][]any {
	if weight <= 0 {
		weight = 1
	}
	out := make([][]any, 0, len(rows)+1)
	var total float64
	for i, r := range rows {
		points := r.Points
		if r.individual {
			points *= weight
		}
		total += points
		rank := ""
		if r.Rank > 0 {
			rank = strconv.Itoa(r.Rank)
		}
		out = append(out, []any{
			i + 1, r.SportName, r.EventName, r.Category, r.AthleteName,
			rank, r.ResultText, r.Source, points, r.Remark,
		})
	}
	if len(rows) > 0 {
		out = append(out, []any{"合计", "", "", "", "", "", "", "", total, ""})
	}
	return out
}