package voiceroomrocket

import (
	"context"
	"errors"
	"math"
	"net/http"
	"time"

	"chatapp3-golang/internal/model"
	"chatapp3-golang/internal/utils"

	"gorm.io/gorm"
)

// GetStatus 查询房间当前火箭状态，懒初始化当天状态。
func (s *Service) GetStatus(ctx context.Context, user AuthUser, roomID int64) (*StatusResponse, error) {
	if roomID <= 0 {
		return nil, NewAppError(http.StatusBadRequest, "missing_room_id", "roomId is required")
	}
	snapshot, err := s.loadConfig(ctx, user.SysOrigin)
	if err != nil {
		return nil, err
	}
	local := resolveLocation(snapshot.Timezone)
	now := time.Now().In(local)
	status, err := s.loadOrInitStatus(ctx, nil, snapshot.SysOrigin, roomID, dayKey(now, local), now)
	if err != nil {
		return nil, err
	}
	levels, err := s.loadLevelConfigs(ctx, snapshot.SysOrigin, true)
	if err != nil {
		return nil, err
	}
	currentLevelConfig, err := s.loadLevelConfig(ctx, snapshot.SysOrigin, status.CurrentLevel)
	if err != nil {
		return nil, err
	}
	rewards, err := s.loadRewardConfigs(ctx, snapshot.SysOrigin, status.CurrentLevel)
	if err != nil {
		return nil, err
	}
	percent, displayPercent := decimalPercent(status.CurrentEnergy, status.NeedEnergy)
	shake := status.NeedEnergy > 0 &&
		float64(status.CurrentEnergy)*100/float64(status.NeedEnergy) >= parsePercent(currentLevelConfig.ShakeThresholdPercent)
	kings, _ := s.topKingRecords(ctx, snapshot.SysOrigin, roomID, status.DayKey, status.RoundNo, status.CurrentLevel, 3)
	countdownSeconds := s.launchCountdownSeconds(ctx, status, time.Now())
	return &StatusResponse{
		RoomID:                 roomID,
		DayKey:                 status.DayKey,
		RoundNo:                status.RoundNo,
		DisplayRound:           status.RoundNo > 1,
		Status:                 status.Status,
		CurrentLevel:           status.CurrentLevel,
		CurrentEnergy:          status.CurrentEnergy,
		NeedEnergy:             status.NeedEnergy,
		EnergyPercent:          percent,
		DisplayPercent:         displayPercent,
		LaunchCountdownSeconds: countdownSeconds,
		Shake:                  shake,
		PreviewRocketURL:       currentLevelConfig.PreviewRocketURL,
		RocketIconURL:          currentLevelConfig.RocketIconURL,
		RocketAnimationURL:     currentLevelConfig.RocketAnimationURL,
		Levels:                 buildLevelPayloads(levels),
		RewardPreview:          rewardPreviewPayload(rewards),
		RocketKings:            kings,
	}, nil
}

func (s *Service) loadOrInitStatus(ctx context.Context, tx *gorm.DB, sysOrigin string, roomID int64, day string, now time.Time) (model.VoiceRoomRocketStatus, error) {
	db := s.repo.DB.WithContext(ctx)
	if tx != nil {
		db = tx.WithContext(ctx)
	}
	var row model.VoiceRoomRocketStatus
	err := db.Where("sys_origin = ? AND room_id = ? AND day_key = ?", sysOrigin, roomID, day).First(&row).Error
	if err == nil {
		return row, nil
	}
	if !errors.Is(err, gorm.ErrRecordNotFound) {
		return model.VoiceRoomRocketStatus{}, err
	}
	levelConfig, err := s.loadLevelConfig(ctx, sysOrigin, 1)
	if err != nil {
		return model.VoiceRoomRocketStatus{}, err
	}
	id, err := utils.NextID()
	if err != nil {
		return model.VoiceRoomRocketStatus{}, err
	}
	row = model.VoiceRoomRocketStatus{
		ID:             id,
		SysOrigin:      sysOrigin,
		RoomID:         roomID,
		DayKey:         day,
		RoundNo:        1,
		CurrentLevel:   1,
		CurrentEnergy:  0,
		NeedEnergy:     levelConfig.NeedEnergy,
		Status:         statusCharging,
		LevelStartTime: now,
		CreateTime:     now,
		UpdateTime:     now,
	}
	if err := db.Create(&row).Error; err != nil {
		if isDuplicateKeyErr(err) {
			var existing model.VoiceRoomRocketStatus
			if loadErr := db.Where("sys_origin = ? AND room_id = ? AND day_key = ?", sysOrigin, roomID, day).First(&existing).Error; loadErr != nil {
				return model.VoiceRoomRocketStatus{}, loadErr
			}
			return existing, nil
		}
		return model.VoiceRoomRocketStatus{}, err
	}
	if err := s.ensureLevelRound(ctx, tx, sysOrigin, roomID, day, 1, 1, levelConfig.NeedEnergy, now); err != nil {
		return model.VoiceRoomRocketStatus{}, err
	}
	return row, nil
}

func (s *Service) launchCountdownSeconds(ctx context.Context, status model.VoiceRoomRocketStatus, now time.Time) int {
	if status.Status != statusLaunching {
		return 0
	}
	var round model.VoiceRoomRocketLevelRound
	err := s.repo.DB.WithContext(ctx).
		Where(
			"sys_origin = ? AND room_id = ? AND day_key = ? AND round_no = ? AND level = ?",
			status.SysOrigin, status.RoomID, status.DayKey, status.RoundNo, status.CurrentLevel,
		).
		First(&round).Error
	if err != nil || round.ReachTime == nil || round.ReachTime.IsZero() {
		return defaultLaunchDelaySeconds
	}
	due := round.ReachTime.Add(time.Duration(defaultLaunchDelaySeconds) * time.Second)
	remaining := due.Sub(now).Seconds()
	if remaining <= 0 {
		return 0
	}
	return int(math.Ceil(remaining))
}

func (s *Service) ensureLevelRound(ctx context.Context, tx *gorm.DB, sysOrigin string, roomID int64, day string, roundNo int, level int, needEnergy int64, now time.Time) error {
	db := s.repo.DB.WithContext(ctx)
	if tx != nil {
		db = tx.WithContext(ctx)
	}
	var row model.VoiceRoomRocketLevelRound
	err := db.Where(
		"sys_origin = ? AND room_id = ? AND day_key = ? AND round_no = ? AND level = ?",
		sysOrigin, roomID, day, roundNo, level,
	).First(&row).Error
	if err == nil {
		return nil
	}
	if !errors.Is(err, gorm.ErrRecordNotFound) {
		return err
	}
	id, err := utils.NextID()
	if err != nil {
		return err
	}
	row = model.VoiceRoomRocketLevelRound{
		ID:          id,
		SysOrigin:   sysOrigin,
		RoomID:      roomID,
		DayKey:      day,
		RoundNo:     roundNo,
		Level:       level,
		NeedEnergy:  needEnergy,
		FinalEnergy: 0,
		Status:      levelRoundStatusCharging,
		CreateTime:  now,
		UpdateTime:  now,
	}
	if err := db.Create(&row).Error; err != nil && !isDuplicateKeyErr(err) {
		return err
	}
	return nil
}

func buildLevelPayloads(rows []model.VoiceRoomRocketLevelConfig) []LevelConfigPayload {
	result := make([]LevelConfigPayload, 0, len(rows))
	for _, row := range rows {
		result = append(result, levelPayload(row))
	}
	return result
}