// Package sys
// @Link  https://github.com/bufanyun/hotgo
// @Copyright  Copyright (c) 2026 HotGo
// @Author  Ms <133814250@qq.com>
// @License  https://github.com/bufanyun/hotgo/blob/master/LICENSE
package sys

import (
	"context"
	"crypto/sha256"
	"encoding/hex"
	"encoding/json"
	"fmt"
	"hotgo/internal/library/imtenant"
	"hotgo/internal/model/input/sysin"
	"hotgo/internal/service"
	"strings"
	"time"

	"github.com/gogf/gf/v2/database/gdb"
	"github.com/gogf/gf/v2/errors/gerror"
	"github.com/gogf/gf/v2/os/gctx"
	"github.com/gogf/gf/v2/util/guid"
	"golang.org/x/crypto/bcrypt"
)

type sSysImUser struct{}

func NewSysImUser() *sSysImUser {
	return &sSysImUser{}
}

func init() {
	service.RegisterSysImUser(NewSysImUser())
}

// List 获取IM用户列表
func (s *sSysImUser) List(ctx context.Context, in *sysin.ImUserListInp) (list []*sysin.ImUserListModel, totalCount int, err error) {
	if err = in.Filter(ctx); err != nil {
		return
	}

	scope, err := resolveImAdminScope(ctx, in.TenantId)
	if err != nil {
		return
	}
	db, tenant, err := imtenant.DB(ctx, scope.TenantId)
	if err != nil {
		return
	}

	mod := s.listModel(ctx, db)
	mod = s.applyListWhere(mod, in)
	mod = mod.Page(in.Page, in.PerPage).OrderDesc("u.id")

	if err = mod.ScanAndCount(&list, &totalCount, false); err != nil {
		err = gerror.Wrap(err, "获取IM用户列表失败，请稍后重试！")
		return
	}
	if len(list) == 0 {
		return
	}

	for _, item := range list {
		item.TenantId = tenant.Id
		item.TenantName = tenant.Name
	}
	if err = s.fillAuthAndCredentials(ctx, db, list); err != nil {
		return
	}
	return
}

func (s *sSysImUser) listModel(ctx context.Context, db gdb.DB) *gdb.Model {
	return db.Model("im_users u").Safe().Ctx(ctx).
		LeftJoin("im_user_profiles up", "up.user_id = u.id").
		LeftJoin("im_user_security us", "us.user_id = u.id").
		Fields(
			"CAST(u.id AS CHAR) user_id",
			"u.username",
			"COALESCE(u.phone, '') phone",
			"u.state",
			"u.lastseen last_seen",
			"u.useragent user_agent",
			"u.createdat created_at",
			"u.updatedat updated_at",
			"up.nickname",
			"up.public_account",
			"up.gender",
			"up.region",
			"us.auth_version",
			"us.password_updated_at",
		)
}

func (s *sSysImUser) applyListWhere(mod *gdb.Model, in *sysin.ImUserListInp) *gdb.Model {
	if userId, _ := sysin.ParseOptionalInt64(in.UserId); userId > 0 {
		mod = mod.Where("u.id", userId)
	}
	if in.Nickname != "" {
		mod = mod.WhereLike("up.nickname", "%"+in.Nickname+"%")
	}
	if in.AuthName != "" {
		mod = mod.Where("u.username = ? OR u.phone = ? OR up.email = ?", in.AuthName, in.AuthName, in.AuthName)
	}
	if in.State != nil {
		mod = mod.Where("u.state", *in.State)
	}
	if len(in.CreatedAt) == 2 {
		mod = mod.WhereBetween("u.createdat", in.CreatedAt[0], in.CreatedAt[1])
	}
	if len(in.LastSeen) == 2 {
		mod = mod.WhereBetween("u.lastseen", in.LastSeen[0], in.LastSeen[1])
	}
	return mod
}

func (s *sSysImUser) fillAuthAndCredentials(ctx context.Context, db gdb.DB, list []*sysin.ImUserListModel) (err error) {
	ids := make([]int64, 0, len(list))
	userMap := make(map[int64]*sysin.ImUserListModel, len(list))
	for _, item := range list {
		userId, parseErr := sysin.ParseOptionalInt64(item.UserId)
		if parseErr != nil {
			return parseErr
		}
		ids = append(ids, userId)
		userMap[userId] = item
	}

	credentialRows, err := db.Model("im_credentials").Safe().Ctx(ctx).
		Fields("userid", "method", "value", "done").
		WhereIn("userid", ids).
		WhereNull("deletedat").
		OrderAsc("method").OrderAsc("value").
		All()
	if err != nil {
		return gerror.Wrap(err, "获取IM用户凭证失败，请稍后重试！")
	}
	credentialMap := make(map[int64][]string)
	for _, row := range credentialRows {
		userId := row["userid"].Int64()
		method := row["method"].String()
		value := row["value"].String()
		done := row["done"].Bool()
		if !done {
			value += "(未验证)"
		}
		credentialMap[userId] = append(credentialMap[userId], method+":"+value)
	}

	for userId, item := range userMap {
		item.AuthNames = item.Username
		if item.Phone != "" && item.Phone != item.Username {
			item.AuthNames += ", " + item.Phone
		}
		item.Credentials = strings.Join(credentialMap[userId], ", ")
	}
	return
}

// View 获取IM用户指定信息
func (s *sSysImUser) View(ctx context.Context, in *sysin.ImUserViewInp) (res *sysin.ImUserViewModel, err error) {
	if err = in.Filter(ctx); err != nil {
		return
	}

	scope, err := resolveImAdminScope(ctx, in.TenantId)
	if err != nil {
		return
	}
	db, tenant, err := imtenant.DB(ctx, scope.TenantId)
	if err != nil {
		return
	}

	userId, err := sysin.ParseOptionalInt64(in.UserId)
	if err != nil {
		return nil, err
	}
	fields := append(s.viewFields(), "u.access access_json", "u.public profile_json", "u.trusted trusted_json")
	err = db.Model("im_users u").Safe().Ctx(ctx).
		LeftJoin("im_user_profiles up", "up.user_id = u.id").
		LeftJoin("im_user_security us", "us.user_id = u.id").
		Fields(fields...).
		Where("u.id", userId).
		Scan(&res)
	if err != nil {
		return nil, gerror.Wrap(err, "获取IM用户信息失败，请稍后重试！")
	}
	if res == nil {
		return nil, nil
	}

	res.TenantId = tenant.Id
	res.TenantName = tenant.Name
	list := []*sysin.ImUserListModel{&res.ImUserListModel}
	if err = s.fillAuthAndCredentials(ctx, db, list); err != nil {
		return nil, err
	}
	return
}

func (s *sSysImUser) viewFields() []interface{} {
	return []interface{}{
		"CAST(u.id AS CHAR) user_id",
		"u.username",
		"COALESCE(u.phone, '') phone",
		"u.state",
		"u.lastseen last_seen",
		"u.useragent user_agent",
		"u.createdat created_at",
		"u.updatedat updated_at",
		"up.nickname",
		"up.public_account",
		"up.gender",
		"up.region",
		"up.signature",
		"up.avatar_file_id",
		"CAST(up.birth_date AS CHAR) birth_date",
		"up.version profile_version",
		"us.auth_version",
		"us.password_updated_at",
	}
}

func (s *sSysImUser) ResetPassword(ctx context.Context, in *sysin.ImUserPasswordResetInp) (err error) {
	if err = in.Filter(ctx); err != nil {
		return
	}
	scope, err := resolveImAdminScope(ctx, in.TenantId)
	if err != nil {
		return err
	}
	userId, err := sysin.ParseOptionalInt64(in.UserId)
	if err != nil {
		return err
	}
	db, _, err := imtenant.DB(ctx, scope.TenantId)
	if err != nil {
		return err
	}
	err = resetIMUserPassword(ctx, db, scope, userId, in.NewPassword)
	result := "success"
	if err != nil {
		result = "failed"
	}
	_ = writeImAdminAudit(ctx, scope.TenantId, "user_password_reset", "user", userId, result, nil)
	return err
}

func resetIMUserPassword(ctx context.Context, db gdb.DB, scope imAdminScope, userId int64, newPassword string) error {
	passwordHash, err := bcrypt.GenerateFromPassword([]byte(newPassword), bcrypt.DefaultCost)
	if err != nil {
		return gerror.Wrap(err, "生成密码摘要失败")
	}
	securityId, err := imtenant.NextSnowflakeID(ctx)
	if err != nil {
		return gerror.Wrap(err, "生成安全记录ID失败")
	}
	eventId, err := imtenant.NextSnowflakeID(ctx)
	if err != nil {
		return gerror.Wrap(err, "生成安全事件ID失败")
	}
	now := time.Now().UTC().Round(time.Millisecond)
	requestId := scope.RequestId
	if requestId == "" {
		requestId = gctx.CtxId(ctx)
	}
	if requestId == "" {
		requestId = guid.S()
	}
	eventKeyBytes := sha256.Sum256([]byte(fmt.Sprintf("password-reset:%d:%d:%s", scope.TenantId, userId, requestId)))
	eventKey := hex.EncodeToString(eventKeyBytes[:])
	payload, _ := json.Marshal(map[string]any{
		"user_id": userId, "operator_id": scope.OperatorId, "request_id": requestId,
	})
	return db.Transaction(ctx, func(ctx context.Context, tx gdb.TX) error {
		exists, txErr := tx.GetValue("SELECT EXISTS(SELECT 1 FROM im_users WHERE id=? LIMIT 1)", userId)
		if txErr != nil {
			return txErr
		}
		if !exists.Bool() {
			return gerror.New("IM用户不存在")
		}
		result, txErr := tx.Exec("UPDATE im_auth SET secret=? WHERE userid=?", passwordHash, userId)
		if txErr != nil {
			return txErr
		}
		if affected, _ := result.RowsAffected(); affected == 0 {
			return gerror.New("用户认证记录不存在")
		}
		if _, txErr = tx.Exec(`INSERT INTO im_user_security
			(id,user_id,auth_version,password_updated_at,created_at,updated_at)
			VALUES(?,?,?,?,?,?)
			ON DUPLICATE KEY UPDATE auth_version=auth_version+1,
			password_updated_at=VALUES(password_updated_at),updated_at=VALUES(updated_at)`,
			securityId, userId, 2, now, now, now); txErr != nil {
			return txErr
		}
		version, txErr := tx.GetValue("SELECT auth_version FROM im_user_security WHERE user_id=?", userId)
		if txErr != nil {
			return txErr
		}
		var eventPayload map[string]any
		_ = json.Unmarshal(payload, &eventPayload)
		eventPayload["auth_version"] = version.Int()
		payload, _ = json.Marshal(eventPayload)
		_, txErr = tx.Exec(`INSERT INTO im_business_events_outbox
			(id,event_id,target_type,target,actor_user_id,event_type,payload,status,created_at,updated_at)
			VALUES(?,?,?,?,?,?,CAST(? AS JSON),'pending',?,?)
			ON DUPLICATE KEY UPDATE event_id=VALUES(event_id)`, eventId, eventKey, "user",
			fmt.Sprintf("%d", userId), 0, "security.password_reset", string(payload), now, now)
		return txErr
	})
}