package handler

import (
	"net/http"

	"github.com/gin-gonic/gin"
	"gorm.io/gorm"

	"github.com/wangjia/jiu/backend/internal/middleware"
	"github.com/wangjia/jiu/backend/internal/model"
)

type FinanceHandler struct {
	db *gorm.DB
}

func NewFinanceHandler(db *gorm.DB) *FinanceHandler {
	return &FinanceHandler{db: db}
}

// ListRecords GET /api/v1/finance/records
func (h *FinanceHandler) ListRecords(c *gin.Context) {
	shopID := middleware.GetShopID(c)

	var q struct {
		Type     string `form:"type"`
		Month    string `form:"month"` // e.g. "2026-04"
		Page     int    `form:"page,default=1"`
		PageSize int    `form:"page_size,default=50"`
	}
	if err := c.ShouldBindQuery(&q); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	if q.PageSize <= 0 {
		q.PageSize = 50
	}
	if q.Page <= 0 {
		q.Page = 1
	}

	base := h.db.Model(&model.FinanceRecord{}).Where("shop_id = ?", shopID)
	if q.Type != "" {
		base = base.Where("type = ?", q.Type)
	}
	if q.Month != "" {
		base = base.Where("DATE_FORMAT(record_date, '%Y-%m') = ?", q.Month)
	}

	var total int64
	base.Count(&total)

	var records []model.FinanceRecord
	offset := (q.Page - 1) * q.PageSize
	base.Preload("Partner").Order("record_date DESC, id DESC").Offset(offset).Limit(q.PageSize).Find(&records)

	c.JSON(http.StatusOK, gin.H{
		"data":      records,
		"total":     total,
		"page":      q.Page,
		"page_size": q.PageSize,
	})
}