package db

import (
	"context"
	"database/sql"
	"strings"
	"time"

	"github.com/pkg/errors"
	"github.com/uptrace/bun"
)

type Season struct {
	bun.BaseModel `bun:"table:seasons,alias:s"`

	ID              int          `bun:"id,pk,autoincrement"`
	Name            string       `bun:"name,unique"`
	ShortName       string       `bun:"short_name,unique"`
	StartDate       time.Time    `bun:"start_date,notnull"`
	EndDate         bun.NullTime `bun:"end_date"`
	FinalsStartDate bun.NullTime `bun:"finals_start_date"`
	FinalsEndDate   bun.NullTime `bun:"finals_end_date"`
}

type SeasonList struct {
	Seasons  []*Season
	Total    int
	PageOpts PageOpts
}

func NewSeason(ctx context.Context, tx bun.Tx, name, shortname string, start time.Time) (*Season, error) {
	if name == "" {
		return nil, errors.New("name cannot be empty")
	}
	if shortname == "" {
		return nil, errors.New("shortname cannot be empty")
	}
	season := &Season{
		Name:      name,
		ShortName: strings.ToUpper(shortname),
		StartDate: start.Truncate(time.Hour * 24),
	}
	_, err := tx.NewInsert().
		Model(season).
		Exec(ctx)
	if err != nil {
		return nil, errors.Wrap(err, "tx.NewInsert")
	}
	return season, nil
}

func ListSeasons(ctx context.Context, tx bun.Tx, pageOpts *PageOpts) (*SeasonList, error) {
	pageOpts = setDefaultPageOpts(pageOpts, 1, 10, bun.OrderDesc, "start_date")
	seasons := new([]*Season)
	err := tx.NewSelect().
		Model(seasons).
		OrderBy(pageOpts.OrderBy, pageOpts.Order).
		Offset(pageOpts.PerPage * (pageOpts.Page - 1)).
		Limit(pageOpts.PerPage).
		Scan(ctx)
	if err != nil && err != sql.ErrNoRows {
		return nil, errors.Wrap(err, "tx.NewSelect")
	}
	total, err := tx.NewSelect().
		Model(seasons).
		Count(ctx)
	if err != nil {
		return nil, errors.Wrap(err, "tx.NewSelect")
	}
	sl := &SeasonList{
		Seasons:  *seasons,
		Total:    total,
		PageOpts: *pageOpts,
	}
	return sl, nil
}

func GetSeason(ctx context.Context, tx bun.Tx, shortname string) (*Season, error) {
	season := new(Season)
	err := tx.NewSelect().
		Model(season).
		Where("short_name = ?", strings.ToUpper(shortname)).
		Limit(1).
		Scan(ctx)
	if err != nil && err != sql.ErrNoRows {
		return nil, errors.Wrap(err, "tx.NewSelect")
	}
	return season, nil
}

func IsSeasonNameUnique(ctx context.Context, tx bun.Tx, name string) (bool, error) {
	count, err := tx.NewSelect().
		Model((*Season)(nil)).
		Where("name = ?", name).
		Count(ctx)
	if err != nil {
		return false, errors.Wrap(err, "tx.NewSelect")
	}
	return count == 0, nil
}

func IsSeasonShortNameUnique(ctx context.Context, tx bun.Tx, shortname string) (bool, error) {
	count, err := tx.NewSelect().
		Model((*Season)(nil)).
		Where("short_name = ?", shortname).
		Count(ctx)
	if err != nil {
		return false, errors.Wrap(err, "tx.NewSelect")
	}
	return count == 0, nil
}