package models

import (
	"context"
	"errors"
	"time"

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

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

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

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

func (m *postsModel) IncrViewCount(ctx context.Context, id int64) error {
	tbl := table.Posts

	stmt := tbl.UPDATE(tbl.Views).SET(tbl.Views.ADD(Int64(1))).WHERE(tbl.ID.EQ(Int64(id)))
	m.log.Infof("sql: %s", stmt.DebugSql())

	var post model.Posts
	err := stmt.QueryContext(ctx, db, &post)
	if err != nil {
		m.log.Errorf("error updating post view count: %v", err)
		return err
	}
	return nil
}

// GetByID
func (m *postsModel) GetByID(ctx context.Context, id int64, cond ...conds.Cond) (*model.Posts, error) {
	tbl := table.Posts

	var combinedCond BoolExpression = tbl.ID.EQ(Int64(id))
	for _, c := range cond {
		combinedCond = c(combinedCond)
	}
	stmt := tbl.SELECT(tbl.AllColumns).WHERE(combinedCond)
	m.log.Infof("sql: %s", stmt.DebugSql())

	var post model.Posts
	err := stmt.QueryContext(ctx, db, &post)
	if err != nil {
		m.log.Errorf("error getting post: %v", err)
		return nil, err
	}
	return &post, nil
}

// Create
func (m *postsModel) Create(ctx context.Context, model *model.Posts) error {
	model.CreatedAt = time.Now()
	model.UpdatedAt = time.Now()

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

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

// Update
func (m *postsModel) Update(ctx context.Context, id int64, model *model.Posts) error {
	model.UpdatedAt = time.Now()

	tbl := table.Posts
	stmt := tbl.UPDATE(tbl.MutableColumns.Except(tbl.CreatedAt, tbl.DeletedAt)).MODEL(model).WHERE(tbl.ID.EQ(Int64(id)))
	m.log.Infof("sql: %s", stmt.DebugSql())

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

// countByCond
func (m *postsModel) countByCondition(ctx context.Context, expr BoolExpression) (int64, error) {
	var cnt struct {
		Cnt int64
	}

	tbl := table.Posts
	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 post items: %v", err)
		return 0, err
	}

	return cnt.Cnt, nil
}

func (m *postsModel) List(ctx context.Context, pagination *requests.Pagination, cond ...conds.Cond) (*requests.Pager, error) {
	pagination.Format()

	combinedCond := table.Posts.DeletedAt.IS_NULL()
	for _, c := range cond {
		combinedCond = c(combinedCond)
	}

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

	var posts []model.Posts = make([]model.Posts, 0)
	err := stmt.QueryContext(ctx, db, &posts)
	if err != nil {
		m.log.Errorf("error querying post items: %v", err)
		return nil, err
	}

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

	return &requests.Pager{
		Items:      posts,
		Total:      count,
		Pagination: *pagination,
	}, nil
}

func (m *postsModel) IsUserBought(ctx context.Context, userId, postId int64) (bool, error) {
	tbl := table.UserPosts
	stmt := tbl.
		SELECT(tbl.ID).
		WHERE(
			tbl.UserID.EQ(Int64(userId)).AND(
				tbl.PostID.EQ(Int64(postId)),
			),
		)
	m.log.Infof("sql: %s", stmt.DebugSql())

	var userPost model.UserPosts
	err := stmt.QueryContext(ctx, db, &userPost)
	if err != nil {
		if errors.Is(err, qrm.ErrNoRows) {
			return false, nil
		}

		m.log.Errorf("error querying user post item: %v", err)
		return false, err
	}

	return userPost.ID > 0, nil
}

func (m *postsModel) Buy(ctx context.Context, userId, postId int64) error {
	tbl := table.UserPosts

	post, err := m.GetByID(ctx, postId)
	if err != nil {
		m.log.Errorf("error getting post by ID: %v", err)
		return err
	}

	user, err := Users.GetByID(ctx, userId)
	if err != nil {
		m.log.Errorf("error getting user by ID: %v", err)
		return err
	}

	record := model.UserPosts{
		UserID: user.ID,
		PostID: post.ID,
		Price:  post.Price * int64(post.Discount) / 100,
	}
	stmt := tbl.INSERT(tbl.MutableColumns).MODEL(record)
	m.log.Infof("sql: %s", stmt.DebugSql())

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

// DeleteByID soft delete item
func (m *postsModel) DeleteByID(ctx context.Context, id int64) error {
	tbl := table.Posts
	stmt := tbl.
		UPDATE(tbl.DeletedAt).
		SET(TimestampT(time.Now())).
		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 deleting post: %v", err)
		return err
	}
	return nil
}

// SendTo
func (m *postsModel) SendTo(ctx context.Context, postId, userId int64) error {
	// add record to user_posts
	tbl := table.UserPosts
	stmt := tbl.INSERT(tbl.MutableColumns).MODEL(model.UserPosts{
		UserID: userId,
		PostID: postId,
	})
	m.log.Infof("sql: %s", stmt.DebugSql())
	if _, err := stmt.ExecContext(ctx, db); err != nil {
		m.log.Errorf("error sending post to user: %v", err)
		return err
	}
	return nil
}

// PostBoughtStatistics 获取指定文件 ID 的购买次数
func (m *postsModel) BoughtStatistics(ctx context.Context, postIds []int64) (map[int64]int64, error) {
	tbl := table.UserPosts

	// select count(user_id), post_id from user_posts up  where post_id in (1, 2,3,4,5,6,7,8,9,10) group by post_id
	stmt := tbl.
		SELECT(
			COUNT(tbl.UserID).AS("cnt"),
			tbl.PostID.AS("post_id"),
		).
		WHERE(
			tbl.PostID.IN(lo.Map(postIds, func(id int64, _ int) Expression { return Int64(id) })...),
		).
		GROUP_BY(
			tbl.PostID,
		)
	m.log.Infof("sql: %s", stmt.DebugSql())

	var result []struct {
		Cnt    int64
		PostId int64
	}

	if err := stmt.QueryContext(ctx, db, &result); err != nil {
		m.log.Errorf("error getting post bought statistics: %v", err)
		return nil, err
	}

	// convert to map
	resultMap := make(map[int64]int64)
	for _, item := range result {
		resultMap[item.PostId] = item.Cnt
	}

	return resultMap, nil
}

// Bought
func (m *postsModel) Bought(ctx context.Context, userId int64, pagination *requests.Pagination) (*requests.Pager, error) {
	pagination.Format()

	// select up.price,up.created_at,p.* from user_posts up  left join posts p on up.post_id = p.id where up.user_id =1
	tbl := table.UserPosts
	stmt := tbl.
		SELECT(
			tbl.Price.AS("price"),
			tbl.CreatedAt.AS("bought_at"),
			table.Posts.Title.AS("title"),
		).
		FROM(
			tbl.INNER_JOIN(table.Posts, table.Posts.ID.EQ(tbl.PostID)),
		).
		WHERE(
			tbl.UserID.EQ(Int64(userId)),
		).
		ORDER_BY(tbl.ID.DESC()).
		LIMIT(pagination.Limit).
		OFFSET(pagination.Offset)

	m.log.Infof("sql: %s", stmt.DebugSql())

	var items []struct {
		Title    string    `json:"title"`
		Price    int64     `json:"price"`
		BoughtAt time.Time `json:"bought_at"`
	}

	if err := stmt.QueryContext(ctx, db, &items); err != nil {
		m.log.Errorf("error getting bought posts: %v", err)
		return nil, err
	}

	// convert to model.Posts
	var cnt struct {
		Cnt int64
	}
	stmtCnt := tbl.
		SELECT(COUNT(tbl.ID).AS("cnt")).
		WHERE(
			tbl.UserID.EQ(Int64(userId)),
		)

	if err := stmtCnt.QueryContext(ctx, db, &cnt); err != nil {
		m.log.Errorf("error getting bought posts count: %v", err)
		return nil, err
	}

	return &requests.Pager{
		Items:      items,
		Total:      cnt.Cnt,
		Pagination: *pagination,
	}, nil
}

// GetPostsMapByIDs
func (m *postsModel) GetPostsMapByIDs(ctx context.Context, ids []int64) (map[int64]model.Posts, error) {
	if len(ids) == 0 {
		return nil, nil
	}

	tbl := table.Posts
	stmt := tbl.
		SELECT(tbl.AllColumns).
		WHERE(
			tbl.ID.IN(lo.Map(ids, func(id int64, _ int) Expression { return Int64(id) })...),
		)

	m.log.Infof("sql: %s", stmt.DebugSql())

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

	return lo.SliceToMap(posts, func(item model.Posts) (int64, model.Posts) {
		return item.ID, item
	}), nil
}

// GetMediaByIds
func (m *postsModel) GetMediaByIds(ctx context.Context, ids []int64) ([]model.Medias, error) {
	if len(ids) == 0 {
		return nil, nil
	}

	tbl := table.Medias
	stmt := tbl.
		SELECT(tbl.AllColumns).
		WHERE(
			tbl.ID.IN(lo.Map(ids, func(id int64, _ int) Expression { return Int64(id) })...),
		)

	m.log.Infof("sql: %s", stmt.DebugSql())

	var medias []model.Medias

	if err := stmt.QueryContext(ctx, db, &medias); err != nil {
		m.log.Errorf("error querying media: %v", err)
		return nil, err
	}

	return medias, nil
}

// Count
func (m *postsModel) Count(ctx context.Context, cond BoolExpression) (int64, error) {
	tbl := table.Posts
	stmt := tbl.
		SELECT(COUNT(tbl.ID).AS("count")).
		WHERE(cond)

	var count struct {
		Count int64
	}
	if err := stmt.QueryContext(ctx, db, &count); err != nil {
		m.log.Errorf("error counting posts: %v", err)
		return 0, err
	}

	return count.Count, nil
}