package model

import (
	"context"
	"fmt"

	"github.com/zeromicro/go-zero/core/stores/cache"
	"github.com/zeromicro/go-zero/core/stores/sqlx"
)

var _ InvProductModel = (*customInvProductModel)(nil)

type StockGroupResult struct {
	Name     string  `db:"name"`
	Count    int64   `db:"count"`
	Quantity float64 `db:"quantity"`
}

type (
	InvProductModel interface {
		invProductModel
		FindList(ctx context.Context, tenantId string, page, pageSize int64, productName, spec, color, location string, status int64) ([]*InvProduct, int64, error)
		FindStockSummary(ctx context.Context, tenantId string) (productCount, totalPieces, totalRolls int64, totalCostValue, totalSalesValue float64, err error)
		FindGroupByColor(ctx context.Context, tenantId string) ([]StockGroupResult, error)
		FindGroupByLocation(ctx context.Context, tenantId string) ([]StockGroupResult, error)
	}

	customInvProductModel struct {
		*defaultInvProductModel
	}
)

func NewInvProductModel(conn sqlx.SqlConn, c cache.CacheConf, opts ...cache.Option) InvProductModel {
	return &customInvProductModel{
		defaultInvProductModel: newInvProductModel(conn, c, opts...),
	}
}

func (m *customInvProductModel) FindList(ctx context.Context, tenantId string, page, pageSize int64, productName, spec, color, location string, status int64) ([]*InvProduct, int64, error) {
	where := "WHERE deleted_at IS NULL AND tenant_id = ?"
	args := []interface{}{tenantId}

	if productName != "" {
		where += " AND product_name LIKE ?"
		args = append(args, "%"+productName+"%")
	}
	if spec != "" {
		where += " AND spec LIKE ?"
		args = append(args, "%"+spec+"%")
	}
	if color != "" {
		where += " AND color = ?"
		args = append(args, color)
	}
	if location != "" {
		where += " AND location = ?"
		args = append(args, location)
	}
	if status >= 0 {
		where += " AND status = ?"
		args = append(args, status)
	}

	var total int64
	countQuery := fmt.Sprintf("SELECT COUNT(*) FROM %s %s", m.table, where)
	err := m.QueryRowNoCacheCtx(ctx, &total, countQuery, args...)
	if err != nil {
		return nil, 0, err
	}

	var list []*InvProduct
	query := fmt.Sprintf("SELECT %s FROM %s %s ORDER BY created_at DESC LIMIT ? OFFSET ?", invProductRows, m.table, where)
	args = append(args, pageSize, (page-1)*pageSize)
	err = m.QueryRowsNoCacheCtx(ctx, &list, query, args...)
	if err != nil {
		return nil, 0, err
	}

	return list, total, nil
}

func (m *customInvProductModel) FindStockSummary(ctx context.Context, tenantId string) (productCount, totalPieces, totalRolls int64, totalCostValue, totalSalesValue float64, err error) {
	var summary struct {
		ProductCount    int64   `db:"product_count"`
		TotalPieces     int64   `db:"total_pieces"`
		TotalRolls      int64   `db:"total_rolls"`
		TotalCostValue  float64 `db:"total_cost_value"`
		TotalSalesValue float64 `db:"total_sales_value"`
	}
	query := fmt.Sprintf("SELECT COUNT(*) AS product_count, COALESCE(SUM(unit_pieces), 0) AS total_pieces, COALESCE(SUM(unit_rolls), 0) AS total_rolls, COALESCE(SUM(stock_quantity * cost_price), 0) AS total_cost_value, COALESCE(SUM(stock_quantity * sales_price), 0) AS total_sales_value FROM %s WHERE deleted_at IS NULL AND tenant_id = ?", m.table)
	err = m.QueryRowNoCacheCtx(ctx, &summary, query, tenantId)
	if err != nil {
		return 0, 0, 0, 0, 0, err
	}
	return summary.ProductCount, summary.TotalPieces, summary.TotalRolls, summary.TotalCostValue, summary.TotalSalesValue, nil
}

func (m *customInvProductModel) FindGroupByColor(ctx context.Context, tenantId string) ([]StockGroupResult, error) {
	var list []StockGroupResult
	query := fmt.Sprintf("SELECT color AS name, COUNT(*) AS count, COALESCE(SUM(stock_quantity), 0) AS quantity FROM %s WHERE deleted_at IS NULL AND tenant_id = ? GROUP BY color ORDER BY count DESC", m.table)
	err := m.QueryRowsNoCacheCtx(ctx, &list, query, tenantId)
	if err != nil {
		return nil, err
	}
	return list, nil
}

func (m *customInvProductModel) FindGroupByLocation(ctx context.Context, tenantId string) ([]StockGroupResult, error) {
	var list []StockGroupResult
	query := fmt.Sprintf("SELECT location AS name, COUNT(*) AS count, COALESCE(SUM(stock_quantity), 0) AS quantity FROM %s WHERE deleted_at IS NULL AND tenant_id = ? GROUP BY location ORDER BY count DESC", m.table)
	err := m.QueryRowsNoCacheCtx(ctx, &list, query, tenantId)
	if err != nil {
		return nil, err
	}
	return list, nil
}