package models

import (
	"context"
	"fmt"
	"time"

	"quyun/app/requests"
	"quyun/database/fields"
	"quyun/database/schemas/public/model"
	"quyun/database/schemas/public/table"

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

// @provider
type ordersModel struct {
	log *logrus.Entry `inject:"false"`
}

func (m *ordersModel) Prepare() error {
	m.log = logrus.WithField("model", "ordersModel")
	return nil
}

// GetByID returns an order by ID
func (m *ordersModel) GetByID(ctx context.Context, id int64) (*model.Orders, error) {
	tbl := table.Orders

	stmt := tbl.
		SELECT(tbl.AllColumns).
		WHERE(
			tbl.ID.EQ(Int64(id)),
		)
	m.log.Infof("sql: %s", stmt.DebugSql())

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

	return &order, nil
}

// BuildConditionWithKey builds the WHERE clause for order queries
func (m *ordersModel) 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 *ordersModel) 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 *ordersModel) 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 []model.Orders = make([]model.Orders, 0)
	if err := stmt.QueryContext(ctx, db, &orders); err != nil {
		m.log.Errorf("error querying orders: %v", err)
		return nil, err
	}

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

	userMap, err := Users.GetUsersMapByIDs(ctx, lo.Map(orders, func(order model.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 {
		model.Orders

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

	return &requests.Pager{
		Items: lo.Map(orders, func(order model.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 (m *ordersModel) Create(ctx context.Context, userId, postId int64) (*model.Orders, error) {
	post, err := Posts.GetByID(ctx, postId)
	if err != nil {
		return nil, errors.Wrap(err, "failed to get post")
	}

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

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

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

// DeleteByID soft deletes an order by ID
func (m *ordersModel) SetStatus(ctx context.Context, orderNo string, status fields.OrderStatus) error {
	tbl := table.Orders
	stmt := tbl.
		UPDATE(tbl.Status).
		SET(status).
		WHERE(
			tbl.OrderNo.EQ(String(orderNo)),
		)
	m.log.Infof("sql: %s", stmt.DebugSql())

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

// Count
func (m *ordersModel) Count(ctx context.Context, cond BoolExpression) (int64, error) {
	tbl := table.Orders
	stmt := SELECT(COUNT(tbl.ID).AS("cnt")).FROM(tbl).WHERE(cond)
	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 counting orders: %v", err)
		return 0, err
	}

	return cnt.Cnt, nil
}

// SumAmount
func (m *ordersModel) 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 *ordersModel) GetByOrderNo(ctx context.Context, orderNo string) (*model.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 model.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
}

// SetTranscationID
func (m *ordersModel) SetTranscationID(ctx context.Context, id int64, transactionID string) error {
	tbl := table.Orders
	stmt := tbl.
		UPDATE(tbl.TransactionID).
		SET(String(transactionID)).
		WHERE(
			tbl.ID.EQ(Int64(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
}

// Update
func (m *ordersModel) Update(ctx context.Context, order *model.Orders) error {
	tbl := table.Orders
	stmt := tbl.
		UPDATE(
			tbl.MutableColumns.Except(
				tbl.OrderNo,
				tbl.Price,
				tbl.Discount,
				tbl.SubOrderNo,
				tbl.PostID,
				tbl.UserID,
			),
		).
		MODEL(order).
		WHERE(
			tbl.ID.EQ(Int64(order.ID)),
		)
	m.log.Infof("sql: %s", stmt.DebugSql())

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