package logic

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

	"go.uber.org/zap"

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

const discoverBotURLPrefix = "https://spark.wyrs365.com/square/discover/bot/"

// ensureDiscoverBots puts one original short post from each existing robot
// onto the square discovery feed. It does not fetch or copy outside articles.
func (s *Service) ensureDiscoverBots(ctx context.Context, channel entity.Channel, category entity.Category) {
	if s == nil || channel != entity.ChannelSquare || category.IsTag() || s.discoverReady.Load() {
		return
	}
	s.discoverMu.Lock()
	defer s.discoverMu.Unlock()
	if s.discoverReady.Load() {
		return
	}
	if err := s.fillDiscoverBots(ctx); err != nil {
		if s.log != nil {
			s.log.Warn("square discover bots", zap.Error(err))
		}
		return
	}
	s.discoverReady.Store(true)
}

func (s *Service) fillDiscoverBots(ctx context.Context) error {
	var failed bool
	for i := 1; i <= userentity.BotCount; i++ {
		email := userentity.BotEmail(i)
		user, err := s.users.GetByEmail(ctx, email)
		if err != nil {
			if errors.Is(err, errs.ErrNotFound) {
				continue
			}
			failed = true
			continue
		}
		if user == nil || user.ID <= 0 || user.Status != userentity.StatusActive {
			continue
		}
		_, err = s.PublishBotMedia(ctx, user.ID, &BotPublishInput{
			Text:      discoverBotText(i, user.Nickname),
			SourceURL: discoverBotURL(i),
			TTL:       15 * 24 * time.Hour,
		})
		if err == nil || errors.Is(err, errs.ErrDuplicate) {
			continue
		}
		failed = true
	}
	if failed {
		return errs.ErrInner
	}
	return nil
}

func discoverBotURL(index int) string {
	if index < 1 {
		return ""
	}
	return fmt.Sprintf("%s%03d", discoverBotURLPrefix, index)
}

func discoverBotText(index int, nickname string) string {
	name := strings.TrimSpace(nickname)
	if name == "" {
		name = fmt.Sprintf("bot%03d", index)
	}
	lines := []string{
		"%s：把今天看到的光记在发现里。",
		"%s：路过广场，留一句给后来的人。",
		"%s：这条是给发现页的，不跟上一句重复。",
		"%s：风很小，适合把一句话放在这里。",
		"%s：发现页空着的时候，补一条短的。",
		"%s：同一条不连发，换个人再看下一句。",
		"%s：文字先到，配图要有合法的对象键才附上。",
		"%s：推荐流里见，不占别的广场频道。",
	}
	return fmt.Sprintf(lines[(index-1)%len(lines)], name)
}