import enum
from typing import Optional
from urllib.parse import quote_plus

import sqlalchemy
from snowflake.sqlalchemy import URL
from sqlalchemy import (
    JSON,
    TIMESTAMP,
    Column,
    Enum,
    ForeignKey,
    Integer,
    String,
    UniqueConstraint,
)
from sqlalchemy.ext.declarative import DeclarativeMeta, declarative_base
from sqlalchemy.orm import relationship
from sqlalchemy_mixins.repr import ReprMixin
from sqlalchemy_mixins.serialize import SerializeMixin
from sqlalchemy_mixins.timestamp import TimestampsMixin

Base: DeclarativeMeta = declarative_base()


class BaseModel(Base, ReprMixin, SerializeMixin, TimestampsMixin):
    __abstract__ = True
    pass


class CatSource(BaseModel):
    __tablename__ = "sources"

    id = Column(Integer, primary_key=True)
    source_type = Column(String)
    name = Column(String, unique=True)
    dialect = Column(String)
    uri = Column(String)
    port = Column(String)
    username = Column(String)
    password = Column(String)
    database = Column(String)
    instance = Column(String)
    cluster = Column(String)
    project_id = Column(String)
    project_credentials = Column(String)
    page_size = Column(String)
    filter_key = Column(String)
    included_tables_regex = Column(String)
    key_path = Column(String)
    account = Column(String)
    role = Column(String)
    warehouse = Column(String)
    aws_access_key_id = Column(String)
    aws_secret_access_key = Column(String)
    region_name = Column(String)
    s3_staging_dir = Column(String)

    schemata = relationship("CatSchema", back_populates="source")
    jobs = relationship("Job", back_populates="source")
    default_schema = relationship(
        "DefaultSchema",
        back_populates="source",
        cascade="all, delete-orphan",
        uselist=False,
    )

    def __init__(
        self,
        source_type: str,
        name: str,
        dialect: Optional[str] = None,
        uri: Optional[str] = None,
        port: Optional[int] = None,
        username: Optional[str] = None,
        password: Optional[str] = None,
        database: Optional[str] = None,
        instance: Optional[str] = None,
        cluster: Optional[str] = None,
        project_id: Optional[str] = None,
        project_credentials: Optional[str] = None,
        page_size: Optional[str] = None,
        filter_key: Optional[str] = None,
        included_tables_regex: Optional[str] = None,
        key_path: Optional[str] = None,
        account: Optional[str] = None,
        role: Optional[str] = None,
        warehouse: Optional[str] = None,
        aws_access_key_id: Optional[str] = None,
        aws_secret_access_key: Optional[str] = None,
        region_name: Optional[str] = None,
        s3_staging_dir: Optional[str] = None,
        **kwargs,
    ):
        self.uri = uri
        self.port = port
        if source_type is not None:
            source_type = source_type.lower()
        self.source_type = source_type
        self.dialect = dialect
        self.username = username
        self.password = password
        self.name = name
        self.database = database
        self.instance = instance
        self.cluster = cluster
        self.project_id = project_id
        self.project_credentials = project_credentials
        self.page_size = page_size
        self.filter_key = filter_key
        self.included_tables_regex = included_tables_regex
        self.key_path = key_path
        self.role = role
        self.account = account
        self.warehouse = warehouse
        self.aws_access_key_id = aws_access_key_id
        self.aws_secret_access_key = aws_secret_access_key
        self.region_name = region_name
        self.s3_staging_dir = s3_staging_dir

    @property
    def conn_string(self):
        if self.source_type == "bigquery":
            project_id = self.project_id
            conn_string = f"bigquery://{project_id}"
        elif self.source_type == "snowflake":
            conn_string = URL(
                account=self.account,
                user=self.username,
                password=self.password,
                database=self.database,
                warehouse=self.warehouse,
                role=self.role,
            )
        elif self.source_type == "sqlite":
            conn_string = "sqlite:///{}".format(self.uri)
        elif self.source_type == "athena":
            conn_string = (
                "awsathena+rest://{aws_access_key_id}:{aws_secret_access_key}@athena.{region_name}.amazonaws.com:443/"
                "?s3_staging_dir={s3_staging_dir}".format(
                    aws_access_key_id=quote_plus(self.aws_access_key_id)
                    if self.aws_access_key_id is not None
                    else "",
                    aws_secret_access_key=quote_plus(self.aws_secret_access_key)
                    if self.aws_secret_access_key is not None
                    else "",
                    region_name=self.region_name,
                    s3_staging_dir=quote_plus(self.s3_staging_dir),
                )
            )
        else:
            username_password_placeholder = (
                f"{self.username}:{self.password}" if self.password is not None else ""
            )

            if self.source_type in ["redshift"]:
                self.dialect = "postgres"
            elif self.source_type == "mysql":
                self.dialect = "mysql+pymysql"
            else:
                self.dialect = self.source_type
            uri_port_placeholder = (
                f"{self.uri}:{self.port}" if self.port is not None else f"{self.uri}"
            )

            database = self.database or ""

            conn_string = f"{self.dialect}://{username_password_placeholder}@{uri_port_placeholder}/{database}"

        return conn_string

    @property
    def fqdn(self):
        return self.name

    def __repr__(self):
        return "<Source: {}>".format(self.name)

    def __eq__(self, other):
        return self.fqdn == other.fqdn

    def __hash__(self):
        return hash(self.fqdn)


class CatSchema(BaseModel):
    __tablename__ = "schemata"

    id = Column(Integer, primary_key=True)
    name = Column(String)
    source_id = Column(Integer, ForeignKey("sources.id"))
    source = relationship("CatSource", back_populates="schemata", lazy="joined")
    tables = relationship("CatTable", back_populates="schema")

    __table_args__ = (UniqueConstraint("source_id", "name", name="unique_schema_name"),)

    @property
    def fqdn(self):
        return self.source.name, self.name

    def __repr__(self):
        return "<Database: {}, Schema: {}>".format(self.source.name, self.name)

    def __eq__(self, other):
        return self.fqdn == other.fqdn

    def __hash__(self):
        return hash(self.fqdn)


class DefaultSchema(BaseModel):
    __tablename__ = "default_schema"

    source_id = Column(Integer, ForeignKey("sources.id"), primary_key=True)
    schema_id = Column(Integer, ForeignKey("schemata.id"))
    schema = relationship("CatSchema")
    source = relationship("CatSource", back_populates="default_schema")


class CatTable(BaseModel):
    __tablename__ = "tables"

    id = Column(Integer, primary_key=True)
    name = Column(String)
    schema_id = Column(Integer, ForeignKey("schemata.id"))
    schema = relationship("CatSchema", back_populates="tables", lazy="joined")
    columns = relationship(
        "CatColumn", back_populates="table", order_by="CatColumn.sort_order"
    )

    __table_args__ = (UniqueConstraint("schema_id", "name", name="unique_table_name"),)

    @property
    def fqdn(self):
        return self.schema.source.name, self.schema.name, self.name

    def __repr__(self):
        return "<Source: {}, Schema: {}, Table: {}>".format(
            self.schema.source.name, self.schema.name, self.name
        )

    def __eq__(self, other):
        return self.fqdn == other.fqdn

    def __hash__(self):
        return hash(self.fqdn)


@enum.unique
class PiiTypes(enum.Enum):
    """PiiTypes enumerates the different types of PII data"""

    NONE = enum.auto()
    UNSUPPORTED = enum.auto()
    PHONE = enum.auto()
    EMAIL = enum.auto()
    CREDIT_CARD = enum.auto()
    ADDRESS = enum.auto()
    PERSON = enum.auto()
    LOCATION = enum.auto()
    BIRTH_DATE = enum.auto()
    GENDER = enum.auto()
    NATIONALITY = enum.auto()
    IP_ADDRESS = enum.auto()
    SSN = enum.auto()
    USER_NAME = enum.auto()
    PASSWORD = enum.auto()


class CatColumn(BaseModel):
    __tablename__ = "columns"

    id = Column(Integer, primary_key=True)
    name = Column(String)
    data_type = Column(String)
    sort_order = Column(Integer)
    pii_type = Column(sqlalchemy.types.Enum(PiiTypes))
    pii_plugin = Column(String)
    table_id = Column(Integer, ForeignKey("tables.id"))
    table = relationship("CatTable", back_populates="columns", lazy="joined")

    __table_args__ = (UniqueConstraint("table_id", "name", name="unique_column_name"),)

    @property
    def fqdn(self):
        return (
            self.table.schema.source.name,
            self.table.schema.name,
            self.table.name,
            self.name,
        )

    def __repr__(self):
        return "<Source: {}, Schema: {}, Table: {}, Column: {}>".format(
            self.table.schema.source.name,
            self.table.schema.name,
            self.table.name,
            self.name,
        )

    def __eq__(self, other):
        return self.fqdn == other.fqdn

    def __lt__(self, other) -> bool:
        for s, o in zip(
            [
                self.table.schema.source.name,
                self.table.schema.name,
                self.table.name,
                self.sort_order,
            ],
            [
                other.table.schema.source.name,
                other.table.schema.name,
                other.table.name,
                other.sort_order,
            ],
        ):
            if s < o:
                return True
            elif s > o:
                return False

        return False

    def __hash__(self):
        return hash(self.fqdn)


class Job(BaseModel):
    __tablename__ = "jobs"

    id = Column(Integer, primary_key=True)
    name = Column(String, unique=True)
    context = Column(JSON)
    source_id = Column(Integer, ForeignKey("sources.id"))
    source = relationship("CatSource", back_populates="jobs")

    __table_args__ = (UniqueConstraint("source_id", "name"),)

    def __repr__(self):
        return "<Job {}, {}".format(self.name, self.context)


class JobExecutionStatus(enum.Enum):
    SUCCESS = 1
    FAILURE = 2


class JobExecution(BaseModel):
    __tablename__ = "job_executions"

    id = Column(Integer, primary_key=True)

    job_id = Column(Integer, ForeignKey("jobs.id"))
    job = relationship("Job", foreign_keys=job_id, lazy="joined")

    started_at = Column(TIMESTAMP)
    ended_at = Column(TIMESTAMP)
    status = Column(Enum(JobExecutionStatus))

    def __repr__(self):
        return "<Job Execution ({}), {}, {}, {}>".format(
            self.job, self.started_at, self.ended_at, self.status
        )


class ColumnLineage(BaseModel):
    __tablename__ = "column_lineage"

    id = Column(Integer, primary_key=True)
    context = Column(JSON)

    source_id = Column(Integer, ForeignKey("columns.id"))
    target_id = Column(Integer, ForeignKey("columns.id"))
    job_execution_id = Column(Integer, ForeignKey("job_executions.id"))

    source = relationship("CatColumn", foreign_keys=source_id, lazy="joined")
    target = relationship("CatColumn", foreign_keys=target_id, lazy="joined")
    job_execution = relationship(
        "JobExecution", foreign_keys=job_execution_id, lazy="joined"
    )

    __table_args__ = (
        UniqueConstraint(
            "source_id", "target_id", "job_execution_id", name="unique_lineage"
        ),
    )

    def __repr__(self):
        return "<Edge: {} -> {} by {}. payload: {}>".format(
            self.source, self.target, self.job_execution, self.context
        )


class Task(BaseModel):
    __tablename__ = "tasks"

    id = Column(Integer, primary_key=True)
    app_name = Column(String)
    status = Column(Integer)
    message = Column(String)
