package controllers

import (
	"context"
	"encoding/json"
	"fmt"
	"io"
	"strconv"
	"strings"
	"time"

	"server/models"
	"server/pkg/jwtutil"
	"server/services/payment"

	beego "github.com/beego/beego/v2/server/web"
)

// PlatformPaymentReconcileController 平台端对账管理（差异列表 / 标记处理 / 账单导入 / 执行对账）
type PlatformPaymentReconcileController struct {
	beego.Controller
}

func (c *PlatformPaymentReconcileController) platformClaims() (*jwtutil.Claims, error) {
	return paymentPlatformClaims(&c.Controller)
}

func (c *PlatformPaymentReconcileController) jsonErr(httpStatus, bizCode int, msg string) {
	c.Ctx.Output.SetStatus(httpStatus)
	c.Data["json"] = map[string]interface{}{"code": bizCode, "msg": msg}
	_ = c.ServeJSON()
}

func (c *PlatformPaymentReconcileController) ok(data interface{}) {
	c.Data["json"] = map[string]interface{}{"code": 200, "msg": "success", "data": data}
	_ = c.ServeJSON()
}

func reconcileDiffDTO(row *models.PlatformPaymentReconcileDiff) map[string]interface{} {
	return map[string]interface{}{
		"id": row.ID, "channel": row.Channel, "bill_date": row.BillDate,
		"batch_no": row.BatchNo, "local_trade_no": row.LocalTradeNo, "channel_trade_no": row.ChannelTradeNo,
		"local_amount": row.LocalAmount, "channel_amount": row.ChannelAmount, "diff_amount": row.DiffAmount,
		"diff_type": row.DiffType, "handle_status": row.HandleStatus,
		"handle_user_id": row.HandleUserID, "handle_user_name": row.HandleUserName,
		"handle_time": row.HandleTime, "remark": row.Remark,
		"create_time": row.CreateTime, "update_time": row.UpdateTime,
	}
}

// ListReconcile GET /platform/payment/reconcile 对账差异列表
func (c *PlatformPaymentReconcileController) ListReconcile() {
	if _, err := c.platformClaims(); err != nil {
		c.jsonErr(401, 401, err.Error())
		return
	}
	page, _ := strconv.Atoi(c.GetString("page", "1"))
	pageSize, _ := strconv.Atoi(c.GetString("pageSize", "10"))
	rows, total, err := payment.ListReconcileDiffs(payment.ReconcileListInput{
		Channel:      strings.TrimSpace(c.GetString("channel")),
		BillDate:     strings.TrimSpace(c.GetString("bill_date")),
		DiffType:     strings.TrimSpace(c.GetString("diff_type")),
		HandleStatus: strings.TrimSpace(c.GetString("handle_status")),
		Page:         page,
		PageSize:     pageSize,
	})
	if err != nil {
		c.jsonErr(500, 500, "查询失败: "+err.Error())
		return
	}
	if rows == nil {
		rows = []models.PlatformPaymentReconcileDiff{}
	}
	list := make([]map[string]interface{}, 0, len(rows))
	for i := range rows {
		list = append(list, reconcileDiffDTO(&rows[i]))
	}
	c.ok(map[string]interface{}{"list": list, "total": total, "page": page, "pageSize": pageSize})
}

// HandleReconcile POST /platform/payment/reconcile/:id/handle 标记差异处理
func (c *PlatformPaymentReconcileController) HandleReconcile() {
	claims, err := c.platformClaims()
	if err != nil {
		c.jsonErr(401, 401, err.Error())
		return
	}
	id, err := strconv.ParseUint(c.Ctx.Input.Param(":id"), 10, 64)
	if err != nil || id == 0 {
		c.jsonErr(400, 400, "无效ID")
		return
	}
	body, _ := io.ReadAll(c.Ctx.Request.Body)
	var p struct {
		HandleStatus string `json:"handle_status"`
		Remark       string `json:"remark"`
	}
	if err := json.Unmarshal(body, &p); err != nil {
		c.jsonErr(400, 400, "参数错误")
		return
	}
	row, err := payment.MarkDiffHandled(context.Background(), payment.MarkDiffHandledInput{
		ID: id, HandleStatus: strings.TrimSpace(p.HandleStatus), Remark: strings.TrimSpace(p.Remark),
		OperatorID: fmt.Sprintf("%d", claims.UserID), OperatorName: claims.Username,
	})
	if err != nil {
		c.jsonErr(400, 400, err.Error())
		return
	}
	c.ok(reconcileDiffDTO(row))
}

// RunReconcile POST /platform/payment/reconcile/run 执行对账比对
func (c *PlatformPaymentReconcileController) RunReconcile() {
	if _, err := c.platformClaims(); err != nil {
		c.jsonErr(401, 401, err.Error())
		return
	}
	body, _ := io.ReadAll(c.Ctx.Request.Body)
	var p struct {
		Channel  string `json:"channel"`
		BillDate string `json:"bill_date"`
	}
	if err := json.Unmarshal(body, &p); err != nil {
		c.jsonErr(400, 400, "参数错误")
		return
	}
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Minute)
	defer cancel()
	summary, err := payment.RunReconcile(ctx, strings.TrimSpace(p.Channel), strings.TrimSpace(p.BillDate))
	if err != nil {
		c.jsonErr(400, 400, err.Error())
		return
	}
	c.ok(summary)
}

// ImportBill POST /platform/payment/reconcile/import 导入渠道账单
// 两种方式：multipart 上传 CSV（字段 file + channel + bill_date），或 JSON {channel, bill_date, rows:[...]}
func (c *PlatformPaymentReconcileController) ImportBill() {
	if _, err := c.platformClaims(); err != nil {
		c.jsonErr(401, 401, err.Error())
		return
	}
	var channel, billDate string
	var rows []payment.BillRow

	contentType := c.Ctx.Request.Header.Get("Content-Type")
	if strings.Contains(contentType, "multipart/form-data") {
		channel = strings.TrimSpace(c.GetString("channel"))
		billDate = strings.TrimSpace(c.GetString("bill_date"))
		file, header, ferr := c.GetFile("file")
		if ferr != nil || header == nil {
			c.jsonErr(400, 400, "请选择账单文件")
			return
		}
		defer func() { _ = file.Close() }()
		data, rerr := io.ReadAll(file)
		if rerr != nil {
			c.jsonErr(400, 400, "读取账单文件失败: "+rerr.Error())
			return
		}
		rows, _ = payment.ParseChannelBillCSV(data)
	} else {
		body, _ := io.ReadAll(c.Ctx.Request.Body)
		var p struct {
			Channel  string            `json:"channel"`
			BillDate string            `json:"bill_date"`
			Rows     []payment.BillRow `json:"rows"`
		}
		if err := json.Unmarshal(body, &p); err != nil {
			c.jsonErr(400, 400, "参数错误")
			return
		}
		channel, billDate, rows = strings.TrimSpace(p.Channel), strings.TrimSpace(p.BillDate), p.Rows
	}

	if channel == "" || billDate == "" {
		c.jsonErr(400, 400, "channel 与 bill_date 不能为空")
		return
	}
	imported, err := payment.ImportChannelBill(context.Background(), channel, billDate, rows)
	if err != nil {
		c.jsonErr(400, 400, err.Error())
		return
	}
	c.ok(map[string]interface{}{"imported": imported, "channel": channel, "bill_date": billDate})
}