package model

import (
	"context"
	"fmt"
	"time"

	"quyun/app/requests"
	"quyun/database/fields"
	"quyun/database/table"

	. "github.com/go-jet/jet/v2/postgres"
	"github.com/pkg/errors"
	"github.com/samber/lo"
)

var ordersUpdateExcludeColumns = []Column{
	table.Orders.OrderNo,
	table.Orders.Price,
	table.Orders.Discount,
	table.Orders.SubOrderNo,
	table.Orders.PostID,
	table.Orders.UserID,
}

func (m *Orders) Update(ctx context.Context) error {
	m.UpdatedAt = time.Now()

	stmt := table.Orders.UPDATE(table.Orders.MutableColumns.Except(table.Orders.OrderNo, table.Orders.Price, table.Orders.Discount, table.Orders.SubOrderNo, table.Orders.PostID, table.Orders.UserID)).SET(m).WHERE(table.Orders.ID.EQ(Int(m.ID))).RETURNING(table.Orders.AllColumns)
	m.log().WithField("func", "Update").Info(stmt.DebugSql())

	if err := stmt.QueryContext(ctx, db, m); err != nil {
		m.log().WithField("func", "Update").Errorf("error updating Orders item: %v", err)
		return err
	}

	m.log().WithField("func", "Update").Infof("Orders item updated successfully")
	return nil
}

// BuildConditionWithKey builds the WHERE clause for order queries
func (m *Orders) BuildConditionWithKey(orderNumber *string, userID *int64) BoolExpression {
	tbl := table.Orders

	cond := Bool(true)

	if orderNumber != nil && *orderNumber != "" {
		cond = cond.AND(
			tbl.OrderNo.LIKE(String("%" + *orderNumber + "%")),
		)
	}

	if userID != nil {
		cond = cond.AND(
			tbl.UserID.EQ(Int(*userID)),
		)
	}

	return cond
}

// countByCondition counts orders matching the given condition
func (m *Orders) countByCondition(ctx context.Context, expr BoolExpression) (int64, error) {
	var cnt struct {
		Cnt int64
	}

	tbl := table.Orders
	stmt := SELECT(COUNT(tbl.ID).AS("cnt")).FROM(tbl).WHERE(expr)
	m.log().Infof("sql: %s", stmt.DebugSql())

	err := stmt.QueryContext(ctx, db, &cnt)
	if err != nil {
		m.log().Errorf("error counting orders: %v", err)
		return 0, err
	}

	return cnt.Cnt, nil
}

// List returns a paginated list of orders
func (m *Orders) List(ctx context.Context, pagination *requests.Pagination, cond BoolExpression) (*requests.Pager, error) {
	pagination.Format()

	tbl := table.Orders
	stmt := tbl.
		SELECT(tbl.AllColumns).
		WHERE(cond).
		ORDER_BY(tbl.ID.DESC()).
		LIMIT(pagination.Limit).
		OFFSET(pagination.Offset)
	m.log().Infof("sql: %s", stmt.DebugSql())

	var orders []Orders = make([]Orders, 0)
	if err := stmt.QueryContext(ctx, db, &orders); err != nil {
		m.log().Errorf("error querying orders: %v", err)
		return nil, err
	}

	postsMap, err := PostsModel().GetPostsMapByIDs(ctx, lo.Map(orders, func(order Orders, _ int) int64 {
		return order.PostID
	}))
	if err != nil {
		m.log().Errorf("error getting posts map: %v", err)
		return nil, err
	}

	userMap, err := UsersModel().GetUsersMapByIDs(ctx, lo.Map(orders, func(order Orders, _ int) int64 {
		return order.UserID
	}))
	if err != nil {
		m.log().Errorf("error getting users map: %v", err)
		return nil, err
	}

	count, err := m.countByCondition(ctx, cond)
	if err != nil {
		m.log().Errorf("error getting order count: %v", err)
		return nil, err
	}

	type orderItem struct {
		Orders

		PostTitle string `json:"post_title"`
		Username  string `json:"username"`
	}

	return &requests.Pager{
		Items: lo.Map(orders, func(order Orders, _ int) *orderItem {
			item := &orderItem{
				Orders: order,
			}

			if post, ok := postsMap[order.PostID]; ok {
				item.PostTitle = post.Title
			}

			if user, ok := userMap[order.UserID]; ok {
				item.Username = user.Username
			}

			return item
		}),
		Total:      count,
		Pagination: *pagination,
	}, nil
}

// Create creates a new order
func (o *Orders) CreateFromUserPostID(ctx context.Context, userId, postId int64) (*Orders, error) {
	post, err := PostsModel().GetByID(ctx, postId)
	if err != nil {
		return nil, errors.Wrap(err, "failed to get post")
	}

	m := &Orders{}
	m.CreatedAt = time.Now()
	m.UpdatedAt = time.Now()
	m.Status = fields.OrderStatusPending
	m.OrderNo = fmt.Sprintf("%s", time.Now().Format("20060102150405"))
	m.SubOrderNo = m.OrderNo
	m.UserID = userId
	m.PostID = postId
	m.Meta = fields.ToJson(fields.OrderMeta{})
	m.Price = post.Price
	m.Discount = post.Discount

	tbl := table.Orders
	stmt := tbl.INSERT(tbl.MutableColumns).MODEL(m).RETURNING(tbl.AllColumns)
	o.log().Infof("sql: %s", stmt.DebugSql())

	if err := stmt.QueryContext(ctx, db, o); err != nil {
		o.log().Errorf("error creating order: %v", err)
		return nil, err
	}
	return o, nil
}

func (m *Orders) SetMeta(ctx context.Context, metaFunc func(fields.OrderMeta) fields.OrderMeta) error {
	tbl := table.Orders
	stmt := tbl.
		UPDATE(tbl.Meta).
		SET(fields.ToJson(metaFunc(m.Meta.Data))).
		WHERE(
			tbl.ID.EQ(Int64(m.ID)),
		).
		RETURNING(tbl.AllColumns)
	m.log().Infof("sql: %s", stmt.DebugSql())

	if err := stmt.QueryContext(ctx, db, m); err != nil {
		m.log().Errorf("error set order meta: %v", err)
		return err
	}
	return nil
}

func (m *Orders) SetStatus(ctx context.Context, status fields.OrderStatus) error {
	tbl := table.Orders
	stmt := tbl.
		UPDATE(tbl.Status).
		SET(status).
		WHERE(
			tbl.ID.EQ(Int64(m.ID)),
		).
		RETURNING(tbl.AllColumns)
	m.log().Infof("sql: %s", stmt.DebugSql())

	if err := stmt.QueryContext(ctx, db, m); err != nil {
		m.log().Errorf("error set order status: %v", err)
		return err
	}
	return nil
}

// SumAmount
func (m *Orders) SumAmount(ctx context.Context) (int64, error) {
	tbl := table.Orders
	stmt := SELECT(SUM(tbl.Price).AS("cnt")).FROM(tbl).WHERE(
		tbl.Status.EQ(Int(int64(fields.OrderStatusCompleted))),
	)
	m.log().Infof("sql: %s", stmt.DebugSql())

	var cnt struct {
		Cnt int64
	}

	err := stmt.QueryContext(ctx, db, &cnt)
	if err != nil {
		m.log().Errorf("error summing order amount: %v", err)
		return 0, err
	}

	return cnt.Cnt, nil
}

// GetByOrderNo
func (m *Orders) GetByOrderNo(ctx context.Context, orderNo string) (*Orders, error) {
	tbl := table.Orders
	stmt := tbl.
		SELECT(tbl.AllColumns).
		WHERE(
			tbl.OrderNo.EQ(String(orderNo)),
		)
	m.log().Infof("sql: %s", stmt.DebugSql())

	var order Orders
	err := stmt.QueryContext(ctx, db, &order)
	if err != nil {
		m.log().Errorf("error querying order by orderNo: %v", err)
		return nil, err
	}

	return &order, nil
}

// SetTransactionID
func (m *Orders) SetTransactionID(ctx context.Context, transactionID string) error {
	tbl := table.Orders
	stmt := tbl.
		UPDATE(tbl.TransactionID).
		SET(String(transactionID)).
		WHERE(
			tbl.ID.EQ(Int64(m.ID)),
		)
	m.log().Infof("sql: %s", stmt.DebugSql())

	if _, err := stmt.ExecContext(ctx, db); err != nil {
		m.log().Errorf("error set order transaction ID: %v", err)
		return err
	}
	return nil
}