package repository

import (
	"electricity_bill_calc/cache"
	"electricity_bill_calc/global"
	"electricity_bill_calc/logger"
	"electricity_bill_calc/model"
	"electricity_bill_calc/tools"
	"electricity_bill_calc/tools/time"
	"fmt"

	"github.com/doug-martin/goqu/v9"
	_ "github.com/doug-martin/goqu/v9/dialect/postgres"
	"github.com/georgysavva/scany/v2/pgxscan"
	"go.uber.org/zap"
)

type _UserRepository struct {
	log *zap.Logger
	ds  goqu.DialectWrapper
}

var UserRepository = _UserRepository{
	log: logger.Named("Repository", "User"),
	ds:  goqu.Dialect("postgres"),
}

// 使用用户名查询指定用户的基本信息
func (ur _UserRepository) FindUserByUsername(username string) (*model.User, error) {
	ur.log.Info("根据用户名查询指定用户的基本信息。", zap.String("username", username))
	if cachedUser, _ := cache.RetreiveEntity[model.User]("user", username); cachedUser != nil {
		ur.log.Info("已经从缓存获取到了符合指定用户名条件的用户基本信息。", zap.String("username", username))
		return cachedUser, nil
	}
	ctx, cancel := global.TimeoutContext()
	defer cancel()

	var user = new(model.User)
	sql, params, _ := ur.ds.From("user").Where(goqu.Ex{"username": username}).Prepared(true).ToSQL()
	if err := pgxscan.Get(ctx, global.DB, &user, sql, params...); err != nil {
		ur.log.Error("从数据库查询指定用户名的用户基本信息失败。", zap.String("username", username), zap.Error(err))
		return nil, err
	}
	cache.CacheEntity(user, []string{"user", fmt.Sprintf("user:%s", username)}, "user", username)
	return user, nil
}

// 使用用户唯一编号查询指定用户的基本信息
func (ur _UserRepository) FindUserById(uid string) (*model.User, error) {
	ur.log.Info("根据用户唯一编号查询指定用户的基本信息。", zap.String("user id", uid))
	if cachedUser, _ := cache.RetreiveEntity[model.User]("user", uid); cachedUser != nil {
		ur.log.Info("已经从缓存获取到了符合指定用户唯一编号的用户基本信息。")
		return cachedUser, nil
	}
	ctx, cancel := global.TimeoutContext()
	defer cancel()

	var user = new(model.User)
	sql, params, _ := ur.ds.From("user").Where(goqu.Ex{"id": uid}).Prepared(true).ToSQL()
	if err := pgxscan.Get(ctx, global.DB, &user, sql, params...); err != nil {
		ur.log.Error("从数据库查询指定用户唯一编号的用户基本信息失败。", zap.String("user id", uid), zap.Error(err))
		return nil, err
	}
	cache.CacheEntity(user, []string{"user", fmt.Sprintf("user:%s", uid)}, "user", uid)
	return user, nil
}

// 使用用户的唯一编号获取用户的详细信息
func (ur _UserRepository) FindUserDetailById(uid string) (*model.UserDetail, error) {
	ur.log.Info("根据用户唯一编号查询指定用户的详细信息。", zap.String("user id", uid))
	if cachedUser, _ := cache.RetreiveEntity[model.UserDetail]("user_detail", uid); cachedUser != nil {
		ur.log.Info("已经从缓存获取到了符合指定用户唯一编号的用户详细信息。")
		return cachedUser, nil
	}
	ctx, cancel := global.TimeoutContext()
	defer cancel()

	var user = new(model.UserDetail)
	sql, params, _ := ur.ds.From("user_detail").Where(goqu.Ex{"id": uid}).Prepared(true).ToSQL()
	if err := pgxscan.Get(ctx, global.DB, &user, sql, params...); err != nil {
		ur.log.Error("从数据库查询指定用户唯一编号的用户详细信息失败。", zap.String("user id", uid), zap.Error(err))
		return nil, err
	}
	cache.CacheEntity(user, []string{"user", fmt.Sprintf("user:%s", uid)}, "user_detail", uid)
	return user, nil
}

// 使用用户唯一编号获取用户的综合详细信息
func (ur _UserRepository) FindUserInformation(uid string) (*model.UserWithDetail, error) {
	ur.log.Info("根据用户唯一编号查询用户的综合详细信息", zap.String("user id", uid))
	if cachedUser, _ := cache.RetreiveEntity[model.UserWithDetail]("user_information", uid); cachedUser != nil {
		ur.log.Info("已经从缓存获取到了符合指定用户唯一编号的用户综合详细信息。")
		return cachedUser, nil
	}
	ctx, cancel := global.TimeoutContext()
	defer cancel()

	var user = new(model.UserWithDetail)
	sql, params, _ := ur.ds.
		From("user").As("u").
		Join(
			goqu.T("user_detail").As("ud"),
			goqu.On(goqu.Ex{
				"ud.id": goqu.I("u.id"),
			})).
		Select(
			"u.id", "u.username", "u.reset_needed", "u.type", "u.enabled",
			"ud.name", "ud.abbr", "ud.region", "ud.address", "ud.contact", "ud.phone",
			"ud.unit_service_fee", "ud.service_expiration",
			"ud.created_at", "ud.created_by", "ud.last_modified_at", "ud.last_modified_by").
		Where(goqu.Ex{"u.id": uid}).
		Prepared(true).ToSQL()
	if err := pgxscan.Get(
		ctx, global.DB, &user, sql, params...); err != nil {
		ur.log.Error("从数据库查询指定用户唯一编号的用户详细信息失败。", zap.String("user id", uid), zap.Error(err))
		return nil, err
	}
	cache.CacheEntity(user, []string{"user", fmt.Sprintf("user:%s", uid)}, "user_information", uid)
	return user, nil
}

// 检查指定用户唯一编号是否存在对应的用户
func (ur _UserRepository) IsUserExists(uid string) (bool, error) {
	ur.log.Info("检查指定用户唯一编号是否存在对应的用户。", zap.String("user id", uid))
	if exists, _ := cache.CheckExists("user", uid); exists {
		ur.log.Info("已经从缓存获取到了符合指定用户唯一编号的用户基本信息。")
		return exists, nil
	}
	ctx, cancel := global.TimeoutContext()
	defer cancel()

	var userCount int
	sql, params, _ := ur.ds.From("user").Select(goqu.COUNT("*")).Where(goqu.Ex{"id": uid}).Prepared(true).ToSQL()
	if err := pgxscan.Get(ctx, global.DB, &userCount, sql, params...); err != nil {
		ur.log.Error("从数据库查询指定用户唯一编号的用户基本信息失败。", zap.String("user id", uid), zap.Error(err))
		return false, err
	}
	if userCount > 0 {
		cache.CacheExists([]string{"user", fmt.Sprintf("user:%s", uid)}, "user", uid)
	}
	return userCount > 0, nil
}

// 创建一个新用户
func (ur _UserRepository) CreateUser(user model.User, detail model.UserDetail, operator *string) (bool, error) {
	ctx, cancel := global.TimeoutContext()
	defer cancel()
	tx, err := global.DB.Begin(ctx)
	if err != nil {
		ur.log.Error("启动数据库事务失败。", zap.Error(err))
		return false, err
	}

	createdTime := time.Now()
	userSql, userParams, _ := ur.ds.
		Insert("user").
		Rows(
			goqu.Record{
				"id": user.Id, "username": user.Username, "password": user.Password,
				"reset_needed": user.ResetNeeded, "type": user.UserType, "enabled": user.Enabled,
				"created_at": createdTime,
			},
		).
		Prepared(true).ToSQL()
	userResult, err := tx.Exec(ctx, userSql, userParams...)
	if err != nil {
		ur.log.Error("向数据库插入新用户基本信息失败。", zap.Error(err))
		tx.Rollback(ctx)
		return false, err
	}
	userDetailSql, userDetailParams, _ := ur.ds.
		Insert("user_detail").
		Rows(
			goqu.Record{
				"id": user.Id, "name": detail.Name, "abbr": tools.PinyinAbbr(*detail.Name), "region": detail.Region,
				"address": detail.Address, "contact": detail.Contact, "phone": detail.Phone,
				"unit_service_fee": detail.UnitServiceFee, "service_expiration": detail.ServiceExpiration,
				"created_at": createdTime, "created_by": operator,
				"last_modified_at": createdTime, "last_modified_by": operator,
			},
		).
		Prepared(true).ToSQL()
	detailResult, err := tx.Exec(ctx, userDetailSql, userDetailParams...)
	if err != nil {
		ur.log.Error("向数据库插入新用户详细信息失败。", zap.Error(err))
		tx.Rollback(ctx)
		return false, err
	}

	err = tx.Commit(ctx)
	if err != nil {
		ur.log.Error("提交数据库事务失败。", zap.Error(err))
		tx.Rollback(ctx)
		return false, err
	} else {
		cache.AbolishRelation("user")
	}
	return userResult.RowsAffected() > 0 && detailResult.RowsAffected() > 0, nil
}