"""SQLAlchemy database models."""

from uuid import uuid4

from sqlalchemy import (
    Column,
    DateTime,
    ForeignKey,
    Integer,
    String,
    Text,
)
from sqlalchemy.dialects.postgresql import JSONB, UUID
from sqlalchemy.orm import relationship
from sqlalchemy.sql import func

from src.db.postgres.connection import Base


class User(Base):
    """User model."""
    __tablename__ = "users"

    id = Column(String, primary_key=True, default=lambda: str(uuid4()))
    fullname = Column(String, nullable=False)
    email = Column(String, nullable=False, unique=True, index=True)
    password = Column(String, nullable=False)  # bcrypt-hashed
    company = Column(String)
    company_size = Column(String)
    function = Column(String)
    site = Column(String)
    role = Column(String)
    status = Column(String, nullable=False, default="active")  # active | inactive
    created_at = Column(DateTime(timezone=True), server_default=func.now())


class Document(Base):
    """Document model."""
    __tablename__ = "documents"

    id = Column(String, primary_key=True, default=lambda: str(uuid4()))
    user_id = Column(String, nullable=False, index=True)
    filename = Column(String, nullable=False)
    blob_name = Column(String, nullable=False, unique=True)
    file_size = Column(Integer)
    file_type = Column(String)  # pdf, docx, txt, etc.
    status = Column(String, default="uploaded")  # uploaded, processing, completed, failed
    processed_at = Column(DateTime(timezone=True))
    error_message = Column(Text)
    created_at = Column(DateTime(timezone=True), server_default=func.now())


class Room(Base):
    """Room model for chat sessions."""
    __tablename__ = "rooms"

    id = Column(String, primary_key=True, default=lambda: str(uuid4()))
    user_id = Column(String, nullable=False, index=True)
    title = Column(String, default="New Chat")
    created_at = Column(DateTime(timezone=True), server_default=func.now())
    updated_at = Column(DateTime(timezone=True), onupdate=func.now())

    status = Column(String, nullable=False, default="active")  # active | inactive

    messages = relationship("ChatMessage", back_populates="room", cascade="all, delete-orphan")


class ChatMessage(Base):
    """Chat message model."""
    __tablename__ = "chat_messages"

    id = Column(String, primary_key=True, default=lambda: str(uuid4()))
    room_id = Column(String, ForeignKey("rooms.id"), nullable=False, index=True)
    role = Column(String, nullable=False)  # user, assistant
    content = Column(Text, nullable=False)
    created_at = Column(DateTime(timezone=True), server_default=func.now())

    room = relationship("Room", back_populates="messages")
    sources = relationship("MessageSource", back_populates="message", cascade="all, delete-orphan")


class MessageSource(Base):
    """Sources (RAG references) attached to an assistant message."""
    __tablename__ = "message_sources"

    id = Column(String, primary_key=True, default=lambda: str(uuid4()))
    message_id = Column(String, ForeignKey("chat_messages.id", ondelete="CASCADE"), nullable=False, index=True)
    document_id = Column(String)
    filename = Column(Text)
    page_label = Column(Text)
    created_at = Column(DateTime(timezone=True), server_default=func.now())

    message = relationship("ChatMessage", back_populates="sources")


class DatabaseClient(Base):
    """User-registered external database connections."""
    __tablename__ = "databases"

    id = Column(String, primary_key=True, default=lambda: str(uuid4()))
    user_id = Column(String, nullable=False, index=True)
    name = Column(String, nullable=False)       # display name, e.g. "Prod DB"
    db_type = Column(String, nullable=False)    # postgres|mysql|sqlserver|supabase|bigquery|snowflake
    credentials = Column(JSONB, nullable=False) # per-type JSON; sensitive fields Fernet-encrypted
    status = Column(String, nullable=False, default="active")  # active | inactive
    created_at = Column(DateTime(timezone=True), server_default=func.now())
    updated_at = Column(DateTime(timezone=True), onupdate=func.now())


class Catalog(Base):
    """Per-user data catalog stored as a single jsonb row.

    `data` holds the full Pydantic Catalog (src/catalog/models.py:Catalog)
    serialized via `model_dump(mode="json")`. Read path uses
    `Catalog.model_validate(...)` to rehydrate.

    Dedicated table — kept separate from `langchain_pg_embedding` so unstructured
    embeddings and structured-catalog metadata never share storage.
    """
    __tablename__ = "data_catalog"

    user_id = Column(String, primary_key=True)
    data = Column(JSONB, nullable=False)
    schema_version = Column(String, nullable=False, default="1.0")
    generated_at = Column(DateTime(timezone=True), server_default=func.now())
    updated_at = Column(DateTime(timezone=True), onupdate=func.now())


class ReportInputRow(Base):
    """One row per completed slow-path analysis (the report's source of truth).

    `data` holds the full Pydantic AnalysisRecord
    (src/agents/slow_path/schemas.py:AnalysisRecord) serialized via
    `model_dump(mode="json")`; the read path rehydrates with
    `AnalysisRecord.model_validate(...)`. Many records accumulate per analysis
    session — `generate_report` reads them by `analysis_id`, oldest-first.

    `analysis_id` is nullable until the Analysis State (owned upstream) is wired
    into the slow path; records still persist (and carry `user_id`) before then.

    OWNERSHIP / HANDOFF (#21/#22, 2026-06-25 checkpoint): table **renamed `analysis_records`
    → `report_inputs`** — it holds the inputs report generation reads (the slow-path run
    records). "report_inputs" avoids clashing with Go's `analyses_messages` and with Langfuse
    observability. **Python-owned for now** (Python still creates it locally); the finalized
    schema goes to Harry so the dedorch migration creates it post-cutover (#22), where
    `id`/`analysis_id` will be `uuid` (+ FK to `analyses(id)`). The Pydantic `AnalysisRecord`
    (the in-memory run object) is intentionally kept. Slated to migrate to Go ownership later —
    keep this + DEV_PLAN #21/#22 as the handoff record. NOTE: dedorch currently still has the
    OLD `analysis_records` table (empty) until Harry's rename migration lands.
    """
    __tablename__ = "report_inputs"

    # id/analysis_id are `uuid` to match dedorch's `report_inputs` + the analysis-family
    # (analyses/reports/data_sources). No FK declared in Python (dedorch's migration owns it, #22).
    id = Column(UUID(as_uuid=False), primary_key=True)  # AnalysisRecord.record_id (uuid hex ok)
    analysis_id = Column(UUID(as_uuid=False), index=True)  # the analysis session id (nullable for now)
    user_id = Column(String, nullable=False, index=True)
    plan_id = Column(String, nullable=False)
    data = Column(JSONB, nullable=False)
    created_at = Column(DateTime(timezone=True), server_default=func.now())


class AnalysisReportRow(Base):
    """One immutable row per generated report version — dedorch `reports` (Go-owned).

    dedorch stores the rendered markdown `content` + `title` + `version` (no jsonb
    snapshot — markdown-only per the 2026-06-23 checkpoint). The read path rebuilds a
    minimal `AnalysisReport` (structured fields empty; `rendered_markdown` = content).
    Versions accumulate per analysis; versioning is serialized by a per-analysis
    advisory lock in `ReportStore`. Class name kept; table + shape changed for dedorch.
    """
    __tablename__ = "reports"

    id = Column(UUID(as_uuid=False), primary_key=True)  # AnalysisReport.report_id (uuid)
    analysis_id = Column(UUID(as_uuid=False), nullable=False, index=True)
    title = Column(String, nullable=False)
    content = Column(Text, nullable=False)  # rendered markdown
    generated_at = Column(DateTime(timezone=True), nullable=False, server_default=func.now())
    version = Column(Integer, nullable=False)


class AnalysisStateRow(Base):
    """Per-analysis session state — the dedorch **`analyses`** table (plural; Go-owned).

    One session = one analysis = one conversation; `id` is the shared session id
    (canonical UUID). Verified against the dedorch DB 2026-06-25.

    dedorch `analyses` columns (reconciled 2026-07-01 — Harry's #3 landed): `id` (uuid),
    `analysis_title`, `objective` (text), `business_questions` (jsonb), `user_id` (text),
    `report_id` (uuid), `status` (text 'active'|'inactive' — soft-delete), `data_bind` (jsonb),
    `data_bind_version` (int), `report_collection` (jsonb), `created_at`, `updated_at`.

    `problem_statement`/`problem_validated` were DROPPED in dedorch (#3) and removed here;
    `objective` + `business_questions` (the user-entered goal, set at onboarding by Go) replace
    them. The FE/Go columns (`status`/`data_bind*`/`report_collection`) are carried to match
    dedorch but are NOT surfaced in the `AnalysisState` pydantic contract. `analysis` (singular)
    is the deprecated DUPLICATE table Harry will drop — never use it. Class name kept.
    """
    __tablename__ = "analyses"

    id = Column(UUID(as_uuid=False), primary_key=True)  # shared session id (uuid)
    analysis_title = Column(String, nullable=False, default="New analysis")
    objective = Column(Text, nullable=False, default="")
    business_questions = Column(JSONB, nullable=False, default=list)
    user_id = Column(String, nullable=False, index=True)  # was owner_id (dedorch uses user_id)
    report_id = Column(UUID(as_uuid=False), nullable=True)
    # dedorch `analyses` columns (FE/Go concerns; carried so create_all matches dedorch).
    status = Column(String, nullable=False, default="active")  # active | inactive (soft-delete)
    data_bind = Column(JSONB, nullable=False, default=list)
    data_bind_version = Column(Integer, nullable=False, default=1)
    report_collection = Column(JSONB, nullable=False, default=list)
    created_at = Column(DateTime(timezone=True), server_default=func.now())
    updated_at = Column(
        DateTime(timezone=True), server_default=func.now(), onupdate=func.now()
    )


class AnalysisDataSourceRow(Base):
    """Per-analysis data-source binding (#10) — dedorch `data_sources` (Go-owned).

    Which catalog sources an analysis is scoped to. `reference_id` is the catalog
    `Source.source_id`; `type`/`name` snapshot the source kind + label. Written at
    `/analysis/create`; read by `structured_flow` scoping + the report appendix.
    `source_metadata` maps to the `metadata` column (`metadata` is reserved by the
    declarative API). Class name kept; table + shape changed for dedorch.
    """
    __tablename__ = "data_sources"

    id = Column(UUID(as_uuid=False), primary_key=True)
    analysis_id = Column(UUID(as_uuid=False), nullable=False, index=True)
    type = Column(String, nullable=False)
    name = Column(String, nullable=False)
    reference_id = Column(String, nullable=False)  # == catalog Source.source_id
    bound_by = Column(String, nullable=False)
    bound_at = Column(DateTime(timezone=True), nullable=False, server_default=func.now())
    source_metadata = Column("metadata", JSONB, nullable=True)
    created_at = Column(DateTime(timezone=True), nullable=False, server_default=func.now())


class AnalysesMessageRow(Base):
    """One conversation message — dedorch `analyses_messages` (Go-owned table).

    The analysis chat room (user question + AI answer), replacing the deprecated
    `rooms`/`chat_messages`. Python is a **consumer/writer** here: it INSERTs and reads
    rows but does NOT own the table (Go's migration creates it). Shape mirrors the Go
    contract (`API_CONTRACT_BE_GOLANG.md` §Analysis Messages): `role ∈ user|ai`. RAG source
    citations are NOT persisted here — the old `message_sources` table is deprecated along
    with `chat_messages`.
    """
    __tablename__ = "analyses_messages"

    id = Column(UUID(as_uuid=False), primary_key=True)
    analysis_id = Column(UUID(as_uuid=False), nullable=False, index=True)
    user_id = Column(String, nullable=False, index=True)
    role = Column(String, nullable=False)  # user | ai
    content = Column(Text, nullable=False)
    created_at = Column(DateTime(timezone=True), nullable=False, server_default=func.now())