from cstime import *
from layer import Layer
from field import Field
from user import User
from field_record import FieldRecord


class Service:
    layer = Layer(LAYER)  # 初始化数据库数据并启动增删查功能

    # 普通用户操作：
    # 请求一条场地使用信息（普通用户自动传入自己的用户id，管理员用户手动选择传入用户id）  #redis
    # 参数：cs_fieldRecord(用户id，场地id，开始时间，结束时间)    返回：bool 是否预约成功
    def AddAppointment(self, cs_fieldRecord) -> bool:
        fieldRecord = FieldRecord(cs_fieldRecord)
        records = self.layer.find_record("Fid", fieldRecord.fid)
        # 如果用户已经有预约了，就不能再提交预约
        if len(self.layer.find_record("Uid", fieldRecord.uid)) != 0:
            raise ValueError("Already has an appointment")
        else:
            # 检查场地此时是否有空
            for x in records:
                if not ((x.end_time >= fieldRecord.start_time) or (x.start_time <= fieldRecord.end_time)):
                    raise ValueError("Field busy")
        # 添加记录
        self.layer.add_record(fieldRecord)
        return True

    # 提前结束场地的使用 正在使用时提前结束    #finished
    # 参数：cs_user  //cs_fieldRecord   返回：bool 是否结束成功
    def EndAppointment(self, cs_user) -> bool:
        user = User(cs_user)
        records = self.layer.find_record("Uid", user.id)
        if len(records) == 0:
            raise ValueError("No appointment")
        elif len(records) != 1:
            raise ValueError("Appointment nums error")
        else:
            fid = records[0].fid
            uid = user.id
            start_time = records[0].start_time
            # 获取当前时间
            curtime = Time()
            # 正在使用时可以提前结束，修改结束时间
            if curtime >= start_time and curtime < records[0].end_time:
                fieldRecord = FieldRecord(fid, uid, start_time, curtime)
                self.layer.remove_record(records[0])
                self.layer.add_record(fieldRecord)
                return True
            else:
                raise ValueError("No ongoing appointment")

    # 取消预约
    # 参数：cs_user //cs_fieldRecord(用户id，场地id，开始时间，结束时间)   返回：bool 是否取消成功
    def CancelAppointment(self, cs_user) -> bool:
        user = User(cs_user)
        records = self.layer.find_record("Uid", user.id)
        if len(records) == 0:
            raise ValueError("No appointment or appointment is finished")
        elif len(records) != 1:
            raise ValueError("Appointment nums error")
        else:
            curtime = Time()
            if curtime < records[0].start_time:
                fieldRecord = FieldRecord(records[0])
                return True
            else:
                raise ValueError("Appointment has started")

    # 延长场地的使用时间    #redis
    # 参数：cs_fieldRecord(用户id，场地id(null)，开始时间(null)，结束时间)   返回：bool 是否延长成功
    def ExtendAppointment(self, cs_fieldRecord) -> bool:
        field_Record = FieldRecord(cs_fieldRecord)
        records = self.layer.find_record("Uid", field_Record.uid)
        if len(records) == 0:
            raise ValueError("No appointment or appointment is finished")
        elif len(records) != 1:
            raise ValueError("Appointment nums error")
        else:
            curtime = Time()
            start_time = records[0].start_time
            end_time = records[0].end_time
            if curtime >= start_time and curtime < end_time:
                addrecord = FieldRecord(field_Record.uid, records[0].fid, start_time, field_Record.end_time)
                self.layer.add_record(addrecord)
                return True
            else:
                raise ValueError("Appointment is finished or not started")

    # 查询场地占用
    # 参数：cs_fieldRecord(用户id(null)，场地id，开始时间(null)，结束时间(null))     返回：list_time  [(start_time,end_time),(...),(...),...]
    def QueryFieldUsage(self, cs_fieldRecord) -> []:
        fid = FieldRecord(cs_fieldRecord).fid
        records = self.layer.find_record("Fid", fid)
        list_time: List[(Time, Time)] = []
        for x in records:
            tup = (x.start_time.struct_time, x.end_time.struct_time)
            list_time.append(tup)
        # 使用 sorted() 函数进行排序，key 参数指定用于排序的键函数
        sorted_time_list = sorted(list_time, key=lambda x: x[0])
        # 从后往前遍历
        for x in range(len(sorted_time_list) - 1, 0, -1):
            strtm2 = sorted_time_list[x][0]
            strtm1 = sorted_time_list[x - 1][1]
            if Time(strtm2) - Time(strtm1) <= Duration.from_minutes(10):
                tup = (sorted_time_list[x - 1][0], sorted_time_list[x][1])
                sorted_time_list.pop(x)
                sorted_time_list[x - 1] = tup
        return sorted_time_list

    # 查询用户的预约记录
    # 参数：cs_user(id)   返回：array_cs_fieldRecord
    def QueryAppointmentRecord(self, cs_user) -> []:
        user = User(cs_user)
        cs_fieldRecords = []
        fieldRecords = self.layer.find_record("Uid", user.id)
        if len(fieldRecords) == 1:
            cs_fieldRecords.append(FieldRecord(fieldRecords[0]))
        elif len(fieldRecords) != 0:
            raise ValueError("Appointment nums error")
        fieldRecords = self.layer.find_finished_record("Uid", user.id)
        if len(fieldRecords) != 0:
            for x in fieldRecords:
                cs_fieldRecords.append(FieldRecord.parse_to_csharp_object(FieldRecord(x)))
        return cs_fieldRecords

    # 管理员操作：（包含普通用户操作以及一下特殊操作）

    # 添加一个场地
    # 参数：cs_field(id,name,position,open_time,type)  返回：bool 是否添加成功
    def AddField(self, cs_field) -> bool:
        field = Field(cs_field)
        fields = self.layer.find_field("Name", field.name)
        if len(fields) > 0:
            raise ValueError("Duplicated name")
        self.layer.add_field(field)
        return True

    # 删除一个场地
    # 参数：cs_field(id,name,position(null),open_time(null),type(null))  返回：bool 是否删除成功
    def RemoveField(self, cs_field) -> bool:
        field = Field(cs_field)
        fields = self.layer.find_field("Id", field.id)
        if len(fields) == 0:
            raise ValueError("No such field")
        if len(fields) != 1:
            raise ValueError("Field id duplication")
        self.layer.remove_field(field)
        return True