package logic

import (
	"context"
	"strings"
	"time"

	"spark-server/internal/module/user/entity"
	"spark-server/internal/pkg/errs"
	"spark-server/internal/pkg/i18n"
	"spark-server/internal/pkg/reqctx"
	"spark-server/internal/pkg/validate"
)

// Profile is the public account view.
type Profile struct {
	UID            int64  `json:"uid"`
	SparkID        string `json:"spark_id"`
	Nickname       string `json:"nickname"`
	Avatar         string `json:"avatar"`
	QRCode         string `json:"qrcode"`
	Birthday       string `json:"birthday"`
	Gender         int    `json:"gender"`
	Status         int    `json:"status"`
	LastLoginTime  int64  `json:"last_login_time"`
	LastActiveTime int64  `json:"last_active_time"`
	CreateTime     int64  `json:"create_time"`
	UpdateTime     int64  `json:"update_time"`
}

func PublicProfile(u *entity.User) *Profile {
	if u == nil {
		return nil
	}
	birthday := ""
	if !u.Birthday.IsZero() {
		birthday = u.Birthday.Format("2006-01-02")
	}
	return &Profile{
		UID:            u.ID,
		SparkID:        u.SparkID,
		Nickname:       u.Nickname,
		Avatar:         u.Avatar,
		QRCode:         u.QRCode,
		Birthday:       birthday,
		Gender:         u.Gender,
		Status:         u.Status,
		LastLoginTime:  unixMS(u.LastLoginAt),
		LastActiveTime: unixMS(u.LastActiveAt),
		CreateTime:     unixMS(u.CreatedAt),
		UpdateTime:     unixMS(u.UpdatedAt),
	}
}

func unixMS(t time.Time) int64 {
	if t.IsZero() {
		return 0
	}
	return t.UnixMilli()
}

func (s *Service) Get(ctx context.Context, id int64) (*entity.User, error) {
	if s == nil || s.repo == nil || id <= 0 {
		return nil, errs.ErrNotFound
	}
	return s.repo.GetByID(ctx, id)
}

func (s *Service) GetByQRCode(ctx context.Context, qrcode string) (*entity.User, error) {
	if s == nil || s.repo == nil || !entity.ValidQRCode(qrcode) {
		return nil, errs.ErrNotFound
	}
	return s.repo.GetByQRCode(ctx, qrcode)
}

type UpdateSparkIDInput struct {
	SparkID string `json:"spark_id" validate:"required,min=6,max=32" label:"field.spark_id" errmsg:"required:validate.user.spark_id_required;min:validate.user.spark_id_invalid;max:validate.user.spark_id_invalid"`
}

// UpdateProfileInput is a partial profile PATCH. Nil fields are left unchanged.
type UpdateProfileInput struct {
	SparkID  *string `json:"spark_id" validate:"omitempty,min=6,max=32" label:"field.spark_id" errmsg:"min:validate.user.spark_id_invalid;max:validate.user.spark_id_invalid"`
	Nickname *string `json:"nickname" validate:"omitempty,min=1,max=64" label:"field.nickname" errmsg:"min:validate.user.nickname_invalid;max:validate.user.nickname_invalid"`
	Avatar   *string `json:"avatar" validate:"omitempty,max=512" label:"field.avatar" errmsg:"max:validate.user.avatar_invalid"`
	Gender   *int    `json:"gender" validate:"omitempty,oneof=0 1 2" label:"field.gender" errmsg:"oneof:validate.user.gender_invalid"`
	Birthday *string `json:"birthday" validate:"omitempty" label:"field.birthday"`
}

func (s *Service) UpdateSparkID(ctx context.Context, userID int64, sparkID string) (*entity.User, error) {
	id := sparkID
	return s.UpdateProfile(ctx, userID, UpdateProfileInput{SparkID: &id})
}

func (s *Service) UpdateProfile(ctx context.Context, userID int64, in UpdateProfileInput) (*entity.User, error) {
	if s == nil || s.repo == nil || userID <= 0 {
		return nil, errs.ErrUnauthorized
	}
	if err := validate.StructLang(reqctx.Lang(ctx), in); err != nil {
		return nil, err
	}
	u, err := s.repo.GetByID(ctx, userID)
	if err != nil {
		return nil, err
	}
	if !profilePatchSet(&in) {
		return u, nil
	}
	if err := applyProfilePatch(ctx, u, &in); err != nil {
		return nil, err
	}
	u.UpdatedAt = time.Now()
	if err := s.repo.UpdateProfile(ctx, u); err != nil {
		return nil, err
	}
	return u, nil
}

func profilePatchSet(in *UpdateProfileInput) bool {
	if in == nil {
		return false
	}
	return in.SparkID != nil || in.Nickname != nil || in.Avatar != nil || in.Gender != nil || in.Birthday != nil
}

func applyProfilePatch(ctx context.Context, u *entity.User, in *UpdateProfileInput) error {
	if in == nil {
		return nil
	}
	lang := reqctx.Lang(ctx)
	if in.SparkID != nil {
		sparkID := strings.TrimSpace(*in.SparkID)
		if !entity.ValidSparkID(sparkID) {
			return errs.ErrInvalidArgument.WithMsg(i18n.T(lang, i18n.KeyUserSparkIDInvalid, nil))
		}
		u.SparkID = sparkID
	}
	if in.Nickname != nil {
		nick := strings.TrimSpace(*in.Nickname)
		if nick == "" || len(nick) > 64 {
			return errs.ErrInvalidArgument.WithMsg(i18n.T(lang, i18n.KeyUserNicknameInvalid, nil))
		}
		u.Nickname = nick
	}
	if in.Avatar != nil {
		avatar := strings.TrimSpace(*in.Avatar)
		if len(avatar) > 512 {
			return errs.ErrInvalidArgument.WithMsg(i18n.T(lang, i18n.KeyUserAvatarInvalid, nil))
		}
		u.Avatar = avatar
	}
	if in.Gender != nil {
		if !entity.ValidGender(*in.Gender) {
			return errs.ErrInvalidArgument.WithMsg(i18n.T(lang, i18n.KeyUserGenderInvalid, nil))
		}
		u.Gender = *in.Gender
	}
	if in.Birthday != nil {
		day, err := parseBirthday(lang, *in.Birthday)
		if err != nil {
			return err
		}
		u.Birthday = day
	}
	return nil
}

func parseBirthday(lang i18n.Lang, raw string) (time.Time, error) {
	raw = strings.TrimSpace(raw)
	if raw == "" {
		return time.Time{}, nil
	}
	day, err := time.ParseInLocation("2006-01-02", raw, time.Local)
	if err != nil {
		return time.Time{}, errs.ErrInvalidArgument.WithMsg(i18n.T(lang, i18n.KeyUserBirthdayInvalid, nil))
	}
	today := time.Now().In(time.Local)
	if day.After(today) || day.Year() < 1900 {
		return time.Time{}, errs.ErrInvalidArgument.WithMsg(i18n.T(lang, i18n.KeyUserBirthdayInvalid, nil))
	}
	return day, nil
}