package errorlog

import (
	"context"
	"net/http"
	"strconv"
	"strings"
	"time"

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

	"gorm.io/gorm"
)

// ReportAgoraError persists one client-reported Agora error log.
func (s *Service) ReportAgoraError(ctx context.Context, user AuthUser, req AgoraErrorReportRequest, meta AgoraErrorReportContext) (*AgoraErrorReportResponse, error) {
	if s == nil || s.db == nil {
		return nil, NewAppError(http.StatusServiceUnavailable, "error_log_unavailable", "error log service is unavailable")
	}
	roomID := req.RoomID.String()
	if roomID == "" {
		return nil, NewAppError(http.StatusBadRequest, "room_id_required", "roomId is required")
	}
	reasonType := firstNonBlank(req.ConnectionChangedReasonType, req.ReasonType, req.Reason)
	bannedByServer := isBannedByServer(reasonType)

	id, err := utils.NextID()
	if err != nil {
		return nil, err
	}
	now := time.Now()
	row := model.AgoraErrorLog{
		ID:                          id,
		SysOrigin:                   normalizeSysOrigin(user.SysOrigin),
		UserID:                      user.UserID,
		RoomID:                      trimMax(roomID, 64),
		AgoraUID:                    trimMax(req.AgoraUID.String(), 64),
		ErrorCodeType:               trimMax(req.ErrorCodeType, 128),
		ConnectionChangedReasonType: trimMax(reasonType, 128),
		BannedByServer:              bannedByServer,
		IsTimeout:                   boolValue(req.Timeout, req.IsTimeout),
		TokenRequestSuccess:         boolPtrValue(req.TokenRequestSuccess, req.TokenSuccess),
		NetworkType:                 trimMax(req.NetworkType, 64),
		ReqClient:                   trimMax(meta.ReqClient, 32),
		ReqAppIntel:                 trimMax(meta.ReqAppIntel, 255),
		ClientIP:                    trimMax(meta.ClientIP, 64),
		UserAgent:                   trimMax(meta.UserAgent, 255),
		RawPayload:                  strings.TrimSpace(meta.RawPayload),
		CreateTime:                  now,
		UpdateTime:                  now,
	}
	if err := s.db.WithContext(ctx).Create(&row).Error; err != nil {
		return nil, err
	}
	return &AgoraErrorReportResponse{
		ID:             strconv.FormatInt(id, 10),
		BannedByServer: bannedByServer,
	}, nil
}

// PageAgoraErrorLogs returns admin Agora error logs.
func (s *Service) PageAgoraErrorLogs(ctx context.Context, query AgoraErrorLogQuery) (*AgoraErrorLogPageResponse, error) {
	if s == nil || s.db == nil {
		return nil, NewAppError(http.StatusServiceUnavailable, "error_log_unavailable", "error log service is unavailable")
	}
	cursor, limit := normalizePage(query.Cursor, query.Limit)
	startTime, endTime, err := parseAdminTimeRange(query.StartTime, query.EndTime)
	if err != nil {
		return nil, err
	}
	filter := query
	filter.Cursor = cursor
	filter.Limit = limit
	filter.StartAt = startTime
	filter.EndAt = endTime

	base := s.agoraErrorLogQuery(ctx, filter)
	var total int64
	if err := base.Count(&total).Error; err != nil {
		return nil, err
	}

	var rows []model.AgoraErrorLog
	if err := s.agoraErrorLogQuery(ctx, filter).
		Order("create_time desc, id desc").
		Offset((cursor - 1) * limit).
		Limit(limit).
		Find(&rows).Error; err != nil {
		return nil, err
	}
	return &AgoraErrorLogPageResponse{
		Records: agoraErrorLogItems(rows),
		Total:   total,
		Current: cursor,
		Size:    limit,
	}, nil
}

// AgoraErrorLogQuery is the admin filter for Agora error logs.
type AgoraErrorLogQuery struct {
	SysOrigin     string
	UserID        int64
	RoomID        string
	AgoraUID      string
	ErrorCodeType string
	ReasonType    string
	BannedOnly    bool
	NetworkType   string
	StartTime     string
	EndTime       string
	Cursor        int
	Limit         int
	StartAt       time.Time
	EndAt         time.Time
}

func (s *Service) agoraErrorLogQuery(ctx context.Context, filter AgoraErrorLogQuery) *gorm.DB {
	query := s.db.WithContext(ctx).Model(&model.AgoraErrorLog{}).
		Where("create_time >= ? AND create_time <= ?", filter.StartAt, filter.EndAt)
	if sysOrigin := normalizeSysOrigin(filter.SysOrigin); sysOrigin != "" {
		query = query.Where("sys_origin = ?", sysOrigin)
	}
	if filter.UserID > 0 {
		query = query.Where("user_id = ?", filter.UserID)
	}
	if roomID := strings.TrimSpace(filter.RoomID); roomID != "" {
		query = query.Where("room_id = ?", roomID)
	}
	if agoraUID := strings.TrimSpace(filter.AgoraUID); agoraUID != "" {
		query = query.Where("agora_uid = ?", agoraUID)
	}
	if codeType := strings.TrimSpace(filter.ErrorCodeType); codeType != "" {
		query = query.Where("error_code_type LIKE ?", "%"+codeType+"%")
	}
	if reasonType := strings.TrimSpace(filter.ReasonType); reasonType != "" {
		query = query.Where("connection_changed_reason_type LIKE ?", "%"+reasonType+"%")
	}
	if filter.BannedOnly {
		query = query.Where("banned_by_server = ?", true)
	}
	if networkType := strings.TrimSpace(filter.NetworkType); networkType != "" {
		query = query.Where("network_type = ?", networkType)
	}
	return query
}

func agoraErrorLogItems(rows []model.AgoraErrorLog) []AgoraErrorLogItem {
	items := make([]AgoraErrorLogItem, 0, len(rows))
	for _, row := range rows {
		items = append(items, AgoraErrorLogItem{
			ID:                          strconv.FormatInt(row.ID, 10),
			SysOrigin:                   row.SysOrigin,
			UserID:                      strconv.FormatInt(row.UserID, 10),
			RoomID:                      row.RoomID,
			AgoraUID:                    row.AgoraUID,
			ErrorCodeType:               row.ErrorCodeType,
			ConnectionChangedReasonType: row.ConnectionChangedReasonType,
			BannedByServer:              row.BannedByServer,
			IsTimeout:                   row.IsTimeout,
			TokenRequestSuccess:         row.TokenRequestSuccess,
			NetworkType:                 row.NetworkType,
			ReqClient:                   row.ReqClient,
			ReqAppIntel:                 row.ReqAppIntel,
			ClientIP:                    row.ClientIP,
			UserAgent:                   row.UserAgent,
			RawPayload:                  row.RawPayload,
			CreateTime:                  formatDateTime(row.CreateTime),
			UpdateTime:                  formatDateTime(row.UpdateTime),
		})
	}
	return items
}