from __future__ import annotations

from datetime import datetime
from enum import Enum
from typing import Optional

from sqlalchemy import (
    DateTime,
    Enum as SAEnum,
    ForeignKey,
    Index,
    JSON,
    String,
    Text,
    UniqueConstraint,
    text,
)
from sqlalchemy.dialects.mysql import BIGINT, INTEGER, TINYINT
from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column, relationship


class Base(DeclarativeBase):
    """Base declarative class for all models."""


# Enumerations centralized to avoid magic strings across the codebase.
class CredentialType(str, Enum):
    ACCESS_KEY = "ACCESS_KEY"
    ASSUME_ROLE = "ASSUME_ROLE"


class RoleName(str, Enum):
    ADMIN = "ADMIN"
    CUSTOMER_ADMIN = "CUSTOMER_ADMIN"
    CUSTOMER_USER = "CUSTOMER_USER"


class InstanceStatus(str, Enum):
    PENDING = "PENDING"
    RUNNING = "RUNNING"
    STOPPING = "STOPPING"
    STOPPED = "STOPPED"
    SHUTTING_DOWN = "SHUTTING_DOWN"
    TERMINATED = "TERMINATED"
    UNKNOWN = "UNKNOWN"


class InstanceDesiredStatus(str, Enum):
    RUNNING = "RUNNING"
    STOPPED = "STOPPED"
    TERMINATED = "TERMINATED"


class JobType(str, Enum):
    SYNC_INSTANCES = "SYNC_INSTANCES"
    START_INSTANCES = "START_INSTANCES"
    STOP_INSTANCES = "STOP_INSTANCES"
    REBOOT_INSTANCES = "REBOOT_INSTANCES"
    TERMINATE_INSTANCES = "TERMINATE_INSTANCES"
    CREATE_INSTANCES = "CREATE_INSTANCES"


class JobStatus(str, Enum):
    PENDING = "PENDING"
    RUNNING = "RUNNING"
    SUCCESS = "SUCCESS"
    FAILED = "FAILED"


class JobItemResourceType(str, Enum):
    INSTANCE = "INSTANCE"
    OTHER = "OTHER"


class JobItemAction(str, Enum):
    CREATE = "CREATE"
    START = "START"
    STOP = "STOP"
    REBOOT = "REBOOT"
    TERMINATE = "TERMINATE"
    SYNC = "SYNC"


class JobItemStatus(str, Enum):
    PENDING = "PENDING"
    RUNNING = "RUNNING"
    SUCCESS = "SUCCESS"
    FAILED = "FAILED"
    SKIPPED = "SKIPPED"


class AuditAction(str, Enum):
    LOGIN = "LOGIN"
    LOGOUT = "LOGOUT"
    INSTANCE_CREATE = "INSTANCE_CREATE"
    INSTANCE_START = "INSTANCE_START"
    INSTANCE_STOP = "INSTANCE_STOP"
    INSTANCE_REBOOT = "INSTANCE_REBOOT"
    INSTANCE_TERMINATE = "INSTANCE_TERMINATE"
    INSTANCE_SYNC = "INSTANCE_SYNC"
    CREDENTIAL_CREATE = "CREDENTIAL_CREATE"
    CREDENTIAL_UPDATE = "CREDENTIAL_UPDATE"
    CREDENTIAL_DELETE = "CREDENTIAL_DELETE"
    CUSTOMER_CREATE = "CUSTOMER_CREATE"
    CUSTOMER_UPDATE = "CUSTOMER_UPDATE"
    CUSTOMER_DELETE = "CUSTOMER_DELETE"
    USER_CREATE = "USER_CREATE"
    USER_UPDATE = "USER_UPDATE"
    USER_DELETE = "USER_DELETE"
    OTHER = "OTHER"


class AuditResourceType(str, Enum):
    USER = "USER"
    CUSTOMER = "CUSTOMER"
    AWS_CREDENTIAL = "AWS_CREDENTIAL"
    INSTANCE = "INSTANCE"
    JOB = "JOB"
    OTHER = "OTHER"


class Role(Base):
    __tablename__ = "roles"
    __table_args__ = (UniqueConstraint("name", name="uniq_role_name"),)

    id: Mapped[int] = mapped_column(BIGINT(unsigned=True), primary_key=True, autoincrement=True)
    name: Mapped[str] = mapped_column(String(64), nullable=False)
    description: Mapped[Optional[str]] = mapped_column(String(255))
    created_at: Mapped[datetime] = mapped_column(DateTime, server_default=text("CURRENT_TIMESTAMP"), nullable=False)
    updated_at: Mapped[datetime] = mapped_column(
        DateTime, server_default=text("CURRENT_TIMESTAMP"), onupdate=text("CURRENT_TIMESTAMP"), nullable=False
    )

    users: Mapped[list["User"]] = relationship("User", back_populates="role")


class Customer(Base):
    __tablename__ = "customers"
    __table_args__ = (UniqueConstraint("name", name="uniq_customer_name"),)

    id: Mapped[int] = mapped_column(BIGINT(unsigned=True), primary_key=True, autoincrement=True)
    name: Mapped[str] = mapped_column(String(128), nullable=False)
    contact_email: Mapped[Optional[str]] = mapped_column(String(128))
    is_active: Mapped[int] = mapped_column(TINYINT(1), server_default=text("1"), nullable=False)
    quota_instances: Mapped[Optional[int]] = mapped_column(INTEGER(unsigned=True))
    notes: Mapped[Optional[str]] = mapped_column(String(255))
    created_at: Mapped[datetime] = mapped_column(DateTime, server_default=text("CURRENT_TIMESTAMP"), nullable=False)
    updated_at: Mapped[datetime] = mapped_column(
        DateTime, server_default=text("CURRENT_TIMESTAMP"), onupdate=text("CURRENT_TIMESTAMP"), nullable=False
    )

    users: Mapped[list["User"]] = relationship("User", back_populates="customer")
    instances: Mapped[list["Instance"]] = relationship("Instance", back_populates="customer")
    customer_credentials: Mapped[list["CustomerCredential"]] = relationship(
        "CustomerCredential", back_populates="customer"
    )
    jobs: Mapped[list["Job"]] = relationship("Job", back_populates="customer")
    audit_logs: Mapped[list["AuditLog"]] = relationship("AuditLog", back_populates="customer")


class User(Base):
    __tablename__ = "users"
    __table_args__ = (
        UniqueConstraint("username", name="uniq_username"),
        UniqueConstraint("email", name="uniq_email"),
        Index("idx_users_role", "role_id"),
        Index("idx_users_customer", "customer_id"),
    )

    id: Mapped[int] = mapped_column(BIGINT(unsigned=True), primary_key=True, autoincrement=True)
    username: Mapped[str] = mapped_column(String(64), nullable=False)
    email: Mapped[Optional[str]] = mapped_column(String(128))
    password_hash: Mapped[str] = mapped_column(String(255), nullable=False)
    role_id: Mapped[int] = mapped_column(ForeignKey("roles.id", ondelete="RESTRICT", onupdate="CASCADE"), nullable=False)
    customer_id: Mapped[Optional[int]] = mapped_column(
        ForeignKey("customers.id", ondelete="SET NULL", onupdate="CASCADE")
    )
    is_active: Mapped[int] = mapped_column(TINYINT(1), server_default=text("1"), nullable=False)
    last_login_at: Mapped[Optional[datetime]] = mapped_column(DateTime)
    created_at: Mapped[datetime] = mapped_column(DateTime, server_default=text("CURRENT_TIMESTAMP"), nullable=False)
    updated_at: Mapped[datetime] = mapped_column(
        DateTime, server_default=text("CURRENT_TIMESTAMP"), onupdate=text("CURRENT_TIMESTAMP"), nullable=False
    )

    role: Mapped["Role"] = relationship("Role", back_populates="users")
    customer: Mapped[Optional["Customer"]] = relationship("Customer", back_populates="users")
    jobs: Mapped[list["Job"]] = relationship("Job", back_populates="created_by_user")
    audit_logs: Mapped[list["AuditLog"]] = relationship("AuditLog", back_populates="user")


class AWSCredential(Base):
    __tablename__ = "aws_credentials"
    __table_args__ = (
        UniqueConstraint("account_id", "name", name="uniq_credential_account_name"),
        Index("idx_credential_account", "account_id"),
        Index("idx_credential_active", "is_active"),
    )

    id: Mapped[int] = mapped_column(BIGINT(unsigned=True), primary_key=True, autoincrement=True)
    name: Mapped[str] = mapped_column(String(128), nullable=False)
    account_id: Mapped[str] = mapped_column(String(32), nullable=False)
    credential_type: Mapped[CredentialType] = mapped_column(
        SAEnum(CredentialType), nullable=False, server_default=text("'ACCESS_KEY'")
    )
    access_key_id: Mapped[Optional[str]] = mapped_column(String(128))
    secret_access_key: Mapped[Optional[str]] = mapped_column(String(256))
    role_arn: Mapped[Optional[str]] = mapped_column(String(256))
    external_id: Mapped[Optional[str]] = mapped_column(String(128))
    default_region: Mapped[str] = mapped_column(String(32), nullable=False, server_default=text("'ap-northeast-1'"))
    is_active: Mapped[int] = mapped_column(TINYINT(1), server_default=text("1"), nullable=False)
    created_at: Mapped[datetime] = mapped_column(DateTime, server_default=text("CURRENT_TIMESTAMP"), nullable=False)
    updated_at: Mapped[datetime] = mapped_column(
        DateTime, server_default=text("CURRENT_TIMESTAMP"), onupdate=text("CURRENT_TIMESTAMP"), nullable=False
    )

    instances: Mapped[list["Instance"]] = relationship("Instance", back_populates="credential")
    customer_credentials: Mapped[list["CustomerCredential"]] = relationship(
        "CustomerCredential", back_populates="credential"
    )


class CustomerCredential(Base):
    __tablename__ = "customer_credentials"
    __table_args__ = (
        UniqueConstraint("customer_id", "credential_id", name="uniq_customer_credential"),
        Index("idx_cc_customer", "customer_id"),
        Index("idx_cc_credential", "credential_id"),
    )

    id: Mapped[int] = mapped_column(BIGINT(unsigned=True), primary_key=True, autoincrement=True)
    customer_id: Mapped[int] = mapped_column(
        ForeignKey("customers.id", ondelete="CASCADE", onupdate="CASCADE"), nullable=False
    )
    credential_id: Mapped[int] = mapped_column(
        ForeignKey("aws_credentials.id", ondelete="CASCADE", onupdate="CASCADE"), nullable=False
    )
    is_allowed: Mapped[int] = mapped_column(TINYINT(1), server_default=text("1"), nullable=False)
    created_at: Mapped[datetime] = mapped_column(DateTime, server_default=text("CURRENT_TIMESTAMP"), nullable=False)
    updated_at: Mapped[datetime] = mapped_column(
        DateTime, server_default=text("CURRENT_TIMESTAMP"), onupdate=text("CURRENT_TIMESTAMP"), nullable=False
    )

    customer: Mapped["Customer"] = relationship("Customer", back_populates="customer_credentials")
    credential: Mapped["AWSCredential"] = relationship("AWSCredential", back_populates="customer_credentials")


class Instance(Base):
    __tablename__ = "instances"
    __table_args__ = (
        UniqueConstraint("account_id", "region", "instance_id", name="uniq_instance_cloud"),
        Index("idx_instances_customer", "customer_id"),
        Index("idx_instances_status", "status"),
        Index("idx_instances_region", "region"),
        Index("idx_instances_last_sync", "last_sync"),
    )

    id: Mapped[int] = mapped_column(BIGINT(unsigned=True), primary_key=True, autoincrement=True)
    customer_id: Mapped[int] = mapped_column(
        ForeignKey("customers.id", ondelete="CASCADE", onupdate="CASCADE"), nullable=False
    )
    credential_id: Mapped[Optional[int]] = mapped_column(
        ForeignKey("aws_credentials.id", ondelete="SET NULL", onupdate="CASCADE")
    )
    account_id: Mapped[str] = mapped_column(String(32), nullable=False)
    region: Mapped[str] = mapped_column(String(32), nullable=False)
    az: Mapped[Optional[str]] = mapped_column(String(32))
    instance_id: Mapped[str] = mapped_column(String(32), nullable=False)
    name_tag: Mapped[Optional[str]] = mapped_column(String(255))
    instance_type: Mapped[str] = mapped_column(String(64), nullable=False)
    ami_id: Mapped[Optional[str]] = mapped_column(String(64))
    key_name: Mapped[Optional[str]] = mapped_column(String(128))
    public_ip: Mapped[Optional[str]] = mapped_column(String(45))
    private_ip: Mapped[Optional[str]] = mapped_column(String(45))
    status: Mapped[InstanceStatus] = mapped_column(
        SAEnum(InstanceStatus), nullable=False, server_default=text("'UNKNOWN'")
    )
    desired_status: Mapped[Optional[InstanceDesiredStatus]] = mapped_column(SAEnum(InstanceDesiredStatus))
    security_groups: Mapped[Optional[dict]] = mapped_column(JSON)
    subnet_id: Mapped[Optional[str]] = mapped_column(String(64))
    vpc_id: Mapped[Optional[str]] = mapped_column(String(64))
    launched_at: Mapped[Optional[datetime]] = mapped_column(DateTime)
    terminated_at: Mapped[Optional[datetime]] = mapped_column(DateTime)
    last_sync: Mapped[Optional[datetime]] = mapped_column(DateTime)
    last_cloud_state: Mapped[Optional[dict]] = mapped_column(JSON)
    created_at: Mapped[datetime] = mapped_column(DateTime, server_default=text("CURRENT_TIMESTAMP"), nullable=False)
    updated_at: Mapped[datetime] = mapped_column(
        DateTime, server_default=text("CURRENT_TIMESTAMP"), onupdate=text("CURRENT_TIMESTAMP"), nullable=False
    )

    customer: Mapped["Customer"] = relationship("Customer", back_populates="instances")
    credential: Mapped[Optional["AWSCredential"]] = relationship("AWSCredential", back_populates="instances")
    job_items: Mapped[list["JobItem"]] = relationship("JobItem", back_populates="instance")


class Job(Base):
    __tablename__ = "jobs"
    __table_args__ = (
        UniqueConstraint("job_uuid", name="uniq_job_uuid"),
        Index("idx_jobs_type", "job_type"),
        Index("idx_jobs_status", "status"),
        Index("idx_jobs_created_at", "created_at"),
    )

    id: Mapped[int] = mapped_column(BIGINT(unsigned=True), primary_key=True, autoincrement=True)
    job_uuid: Mapped[str] = mapped_column(String(32), nullable=False)
    job_type: Mapped[JobType] = mapped_column(SAEnum(JobType), nullable=False)
    status: Mapped[JobStatus] = mapped_column(SAEnum(JobStatus), nullable=False, server_default=text("'PENDING'"))
    progress: Mapped[int] = mapped_column(TINYINT(unsigned=True), nullable=False, server_default=text("0"))
    total_count: Mapped[Optional[int]] = mapped_column(INTEGER(unsigned=True), server_default=text("0"))
    success_count: Mapped[Optional[int]] = mapped_column(INTEGER(unsigned=True), server_default=text("0"))
    fail_count: Mapped[Optional[int]] = mapped_column(INTEGER(unsigned=True), server_default=text("0"))
    skipped_count: Mapped[Optional[int]] = mapped_column(INTEGER(unsigned=True), server_default=text("0"))
    payload: Mapped[Optional[dict]] = mapped_column(JSON)
    error_message: Mapped[Optional[str]] = mapped_column(String(512))
    created_by_user_id: Mapped[Optional[int]] = mapped_column(
        ForeignKey("users.id", ondelete="SET NULL", onupdate="CASCADE")
    )
    created_for_customer: Mapped[Optional[int]] = mapped_column(
        ForeignKey("customers.id", ondelete="SET NULL", onupdate="CASCADE")
    )
    created_at: Mapped[datetime] = mapped_column(DateTime, server_default=text("CURRENT_TIMESTAMP"), nullable=False)
    started_at: Mapped[Optional[datetime]] = mapped_column(DateTime)
    finished_at: Mapped[Optional[datetime]] = mapped_column(DateTime)
    updated_at: Mapped[datetime] = mapped_column(
        DateTime, server_default=text("CURRENT_TIMESTAMP"), onupdate=text("CURRENT_TIMESTAMP"), nullable=False
    )

    created_by_user: Mapped[Optional["User"]] = relationship("User", back_populates="jobs")
    customer: Mapped[Optional["Customer"]] = relationship("Customer", back_populates="jobs")
    items: Mapped[list["JobItem"]] = relationship("JobItem", back_populates="job")


class JobItem(Base):
    __tablename__ = "job_items"
    __table_args__ = (
        Index("idx_job_items_job", "job_id"),
        Index("idx_job_items_instance", "resource_id"),
        Index("idx_job_items_status", "status"),
    )

    id: Mapped[int] = mapped_column(BIGINT(unsigned=True), primary_key=True, autoincrement=True)
    job_id: Mapped[int] = mapped_column(ForeignKey("jobs.id", ondelete="CASCADE", onupdate="CASCADE"), nullable=False)
    resource_type: Mapped[JobItemResourceType] = mapped_column(
        SAEnum(JobItemResourceType), nullable=False, server_default=text("'INSTANCE'")
    )
    resource_id: Mapped[Optional[int]] = mapped_column(
        ForeignKey("instances.id", ondelete="SET NULL", onupdate="CASCADE")
    )
    account_id: Mapped[Optional[str]] = mapped_column(String(32))
    region: Mapped[Optional[str]] = mapped_column(String(32))
    instance_id: Mapped[Optional[str]] = mapped_column(String(32))
    action: Mapped[JobItemAction] = mapped_column(SAEnum(JobItemAction), nullable=False)
    status: Mapped[JobItemStatus] = mapped_column(
        SAEnum(JobItemStatus), nullable=False, server_default=text("'PENDING'")
    )
    error_message: Mapped[Optional[str]] = mapped_column(String(512))
    extra: Mapped[Optional[dict]] = mapped_column(JSON)
    created_at: Mapped[datetime] = mapped_column(DateTime, server_default=text("CURRENT_TIMESTAMP"), nullable=False)
    updated_at: Mapped[datetime] = mapped_column(
        DateTime, server_default=text("CURRENT_TIMESTAMP"), onupdate=text("CURRENT_TIMESTAMP"), nullable=False
    )

    job: Mapped["Job"] = relationship("Job", back_populates="items")
    instance: Mapped[Optional["Instance"]] = relationship("Instance", back_populates="job_items")


class AuditLog(Base):
    __tablename__ = "audit_logs"
    __table_args__ = (
        Index("idx_audit_customer", "customer_id"),
        Index("idx_audit_action", "action"),
        Index("idx_audit_created_at", "created_at"),
        Index("idx_audit_resource", "resource_type", "resource_id"),
    )

    id: Mapped[int] = mapped_column(BIGINT(unsigned=True), primary_key=True, autoincrement=True)
    user_id: Mapped[Optional[int]] = mapped_column(
        ForeignKey("users.id", ondelete="SET NULL", onupdate="CASCADE")
    )
    customer_id: Mapped[Optional[int]] = mapped_column(
        ForeignKey("customers.id", ondelete="SET NULL", onupdate="CASCADE")
    )
    action: Mapped[AuditAction] = mapped_column(SAEnum(AuditAction), nullable=False)
    resource_type: Mapped[AuditResourceType] = mapped_column(SAEnum(AuditResourceType), nullable=False)
    resource_id: Mapped[Optional[int]] = mapped_column(BIGINT(unsigned=True))
    description: Mapped[Optional[str]] = mapped_column(String(512))
    payload: Mapped[Optional[dict]] = mapped_column(JSON)
    ip_address: Mapped[Optional[str]] = mapped_column(String(45))
    user_agent: Mapped[Optional[str]] = mapped_column(String(255))
    created_at: Mapped[datetime] = mapped_column(DateTime, server_default=text("CURRENT_TIMESTAMP"), nullable=False)

    user: Mapped[Optional["User"]] = relationship("User", back_populates="audit_logs")
    customer: Mapped[Optional["Customer"]] = relationship("Customer", back_populates="audit_logs")


class Setting(Base):
    __tablename__ = "settings"
    __table_args__ = (UniqueConstraint("k", name="uniq_settings_key"),)

    id: Mapped[int] = mapped_column(BIGINT(unsigned=True), primary_key=True, autoincrement=True)
    k: Mapped[str] = mapped_column(String(128), nullable=False)
    v: Mapped[Optional[str]] = mapped_column(Text)
    description: Mapped[Optional[str]] = mapped_column(String(255))
    updated_at: Mapped[datetime] = mapped_column(
        DateTime, server_default=text("CURRENT_TIMESTAMP"), onupdate=text("CURRENT_TIMESTAMP"), nullable=False
    )