package logic

import (
	"context"
	"errors"
	"fmt"
	"strings"
	"time"

	userentity "spark-server/internal/module/user/entity"
	"spark-server/internal/pkg/errs"
)

func (s *Service) ensureBots(ctx context.Context) ([]*userentity.User, error) {
	out := make([]*userentity.User, 0, userentity.BotCount)
	for i := 1; i <= userentity.BotCount; i++ {
		u, err := s.ensureBot(ctx, i)
		if err != nil {
			return nil, fmt.Errorf("bot %d: %w", i, err)
		}
		out = append(out, u)
	}
	return out, nil
}

func (s *Service) ensureBot(ctx context.Context, index int) (*userentity.User, error) {
	email := userentity.BotEmail(index)
	if u, err := s.users.GetByEmail(ctx, email); err == nil {
		return u, nil
	} else if !errors.Is(err, errs.ErrNotFound) {
		return nil, err
	}
	id, err := s.ids.NextID()
	if err != nil {
		return nil, err
	}
	nick := nicknameForBot(index)
	qr, err := userentity.NewQRCode()
	if err != nil {
		return nil, err
	}
	now := time.Now()
	u := &userentity.User{
		ID: id, SparkID: userentity.BotSparkID(index), Nickname: nick,
		Avatar: userentity.LetterAvatarDataURI(nick), Gender: userentity.GenderUnknown,
		Status: userentity.StatusActive, QRCode: qr,
		CreatedAt: now, UpdatedAt: now, LastActiveAt: now,
	}
	if err := s.users.CreateWithEmail(ctx, u, email); err != nil {
		if errors.Is(err, errs.ErrDuplicate) {
			return s.users.GetByEmail(ctx, email)
		}
		return nil, err
	}
	return u, nil
}

func (s *Service) ensureTestUsers(ctx context.Context) error {
	for i := 1; i <= 10; i++ {
		email := fmt.Sprintf("test%02d@spark.com", i)
		if _, err := s.users.GetByEmail(ctx, email); err == nil {
			continue
		} else if !errors.Is(err, errs.ErrNotFound) {
			return err
		}
		if _, err := s.createPlainUser(ctx, email); err != nil {
			return err
		}
	}
	return nil
}

func (s *Service) createPlainUser(ctx context.Context, email string) (*userentity.User, error) {
	id, err := s.ids.NextID()
	if err != nil {
		return nil, err
	}
	qr, err := userentity.NewQRCode()
	if err != nil {
		return nil, err
	}
	local, _, _ := strings.Cut(email, "@")
	if local == "" {
		local = "user"
	}
	now := time.Now()
	u := &userentity.User{
		ID: id, SparkID: userentity.DefaultSparkID(id), Nickname: local,
		Avatar: userentity.LetterAvatarDataURI(local), Gender: userentity.GenderUnknown,
		Status: userentity.StatusActive, QRCode: qr,
		CreatedAt: now, UpdatedAt: now, LastActiveAt: now,
	}
	if err := s.users.CreateWithEmail(ctx, u, email); err != nil {
		if errors.Is(err, errs.ErrDuplicate) {
			return s.users.GetByEmail(ctx, email)
		}
		return nil, err
	}
	return u, nil
}