"""CRUD router for security Tests — v2 with Red/Blue workflow.

Endpoints
---------
GET    /tests                        — list with filters (state, technique_id)
POST   /tests                        — create (red_tech, admin)
POST   /tests/from-template          — create from TestTemplate (red_tech, admin)
GET    /tests/{id}                   — detail with split red/blue evidences
PATCH  /tests/{id}                   — general update (draft/rejected only)
PATCH  /tests/{id}/red               — Red Team updates (draft, red_executing)
PATCH  /tests/{id}/blue              — Blue Team updates (blue_evaluating)
POST   /tests/{id}/start-execution   — draft → red_executing
POST   /tests/{id}/submit-red        — red_executing → blue_evaluating
POST   /tests/{id}/submit-blue       — blue_evaluating → in_review
POST   /tests/{id}/validate-red      — Red Lead validates
POST   /tests/{id}/validate-blue     — Blue Lead validates
POST   /tests/{id}/reopen            — rejected → draft
GET    /tests/{id}/timeline          — audit-log history for this test
"""

import uuid
from typing import Optional

from fastapi import APIRouter, Depends, HTTPException, Query, status
from sqlalchemy.orm import Session, joinedload

from app.database import get_db
from app.dependencies.auth import get_current_user, require_any_role
from app.models.audit import AuditLog
from app.models.enums import TestState, TeamSide
from app.models.technique import Technique
from app.models.test import Test
from app.models.test_template import TestTemplate
from app.models.user import User
from app.schemas.test import (
    TestCreate,
    TestOut,
    TestUpdate,
    TestRedUpdate,
    TestBlueUpdate,
    TestRedValidate,
    TestBlueValidate,
)
from app.schemas.test_template import TestTemplateInstantiate
from app.services.audit_service import log_action
from app.services.status_service import recalculate_technique_status
from app.services.test_workflow_service import (
    start_execution as wf_start_execution,
    submit_red_evidence as wf_submit_red,
    submit_blue_evidence as wf_submit_blue,
    validate_as_red_lead as wf_validate_red,
    validate_as_blue_lead as wf_validate_blue,
    reopen_test as wf_reopen,
)

router = APIRouter(prefix="/tests", tags=["tests"])


# ---------------------------------------------------------------------------
# Helpers
# ---------------------------------------------------------------------------

def _get_test_or_404(db: Session, test_id: uuid.UUID) -> Test:
    test = db.query(Test).filter(Test.id == test_id).first()
    if test is None:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Test not found")
    return test


def _get_test_with_technique(db: Session, test_id: uuid.UUID) -> Test:
    test = (
        db.query(Test)
        .options(joinedload(Test.technique))
        .filter(Test.id == test_id)
        .first()
    )
    if test is None:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Test not found")
    return test


# ---------------------------------------------------------------------------
# GET /tests  —  list with filters
# ---------------------------------------------------------------------------


@router.get("", response_model=list[TestOut])
def list_tests(
    state: Optional[str] = Query(None, description="Filter by test state"),
    technique_id: Optional[uuid.UUID] = Query(None, description="Filter by technique"),
    platform: Optional[str] = Query(None, description="Filter by platform"),
    created_by: Optional[uuid.UUID] = Query(None, description="Filter by creator"),
    pending_validation_side: Optional[str] = Query(
        None, description="Filter in_review tests pending validation on 'red' or 'blue' side"
    ),
    offset: int = Query(0, ge=0),
    limit: int = Query(50, ge=1, le=200),
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """Return a paginated list of tests, optionally filtered by state, technique, platform or creator."""
    query = db.query(Test).options(joinedload(Test.technique))

    if state:
        query = query.filter(Test.state == state)
    if technique_id:
        query = query.filter(Test.technique_id == technique_id)
    if platform:
        query = query.filter(Test.platform.ilike(f"%{platform}%"))
    if created_by:
        query = query.filter(Test.created_by == created_by)
    if pending_validation_side == "red":
        query = query.filter(
            Test.state == TestState.in_review,
            Test.red_validation_status.in_(["pending", None]),
        )
    elif pending_validation_side == "blue":
        query = query.filter(
            Test.state == TestState.in_review,
            Test.blue_validation_status.in_(["pending", None]),
        )

    tests = query.order_by(Test.created_at.desc()).offset(offset).limit(limit).all()
    return tests


# ---------------------------------------------------------------------------
# POST /tests  —  create (red_tech or admin)
# ---------------------------------------------------------------------------


@router.post(
    "",
    response_model=TestOut,
    status_code=status.HTTP_201_CREATED,
)
def create_test(
    payload: TestCreate,
    db: Session = Depends(get_db),
    current_user: User = Depends(require_any_role("red_tech")),
):
    """Create a new test linked to an existing technique.

    ``created_by`` is set automatically and ``state`` defaults to *draft*.
    """
    technique = db.query(Technique).filter(Technique.id == payload.technique_id).first()
    if technique is None:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"Technique with id '{payload.technique_id}' not found",
        )

    test = Test(
        **payload.model_dump(),
        created_by=current_user.id,
        state=TestState.draft,
    )
    db.add(test)
    db.commit()
    db.refresh(test)

    log_action(
        db,
        user_id=current_user.id,
        action="create_test",
        entity_type="test",
        entity_id=test.id,
        details={"name": test.name, "technique_id": str(test.technique_id)},
    )

    return test


# ---------------------------------------------------------------------------
# POST /tests/from-template  —  create from TestTemplate
# ---------------------------------------------------------------------------


@router.post(
    "/from-template",
    response_model=TestOut,
    status_code=status.HTTP_201_CREATED,
)
def create_test_from_template(
    payload: TestTemplateInstantiate,
    db: Session = Depends(get_db),
    current_user: User = Depends(require_any_role("red_tech")),
):
    """Instantiate a real Test from an existing TestTemplate.

    The template's fields are copied into the new test as starting data.
    """
    template = db.query(TestTemplate).filter(TestTemplate.id == payload.template_id).first()
    if template is None:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"TestTemplate with id '{payload.template_id}' not found",
        )

    technique = db.query(Technique).filter(Technique.id == payload.technique_id).first()
    if technique is None:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"Technique with id '{payload.technique_id}' not found",
        )

    test = Test(
        technique_id=payload.technique_id,
        name=template.name,
        description=template.description,
        platform=template.platform,
        procedure_text=template.attack_procedure,
        tool_used=template.tool_suggested,
        created_by=current_user.id,
        state=TestState.draft,
    )
    db.add(test)
    db.commit()
    db.refresh(test)

    log_action(
        db,
        user_id=current_user.id,
        action="create_test_from_template",
        entity_type="test",
        entity_id=test.id,
        details={
            "name": test.name,
            "template_id": str(template.id),
            "technique_id": str(test.technique_id),
        },
    )

    return test


# ---------------------------------------------------------------------------
# GET /tests/{id}  —  detail with evidences split by team
# ---------------------------------------------------------------------------


@router.get("/{test_id}", response_model=TestOut)
def get_test(
    test_id: uuid.UUID,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """Return full details for a single test, including its evidences."""
    test = (
        db.query(Test)
        .options(joinedload(Test.evidences))
        .filter(Test.id == test_id)
        .first()
    )

    if test is None:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="Test not found",
        )

    return test


# ---------------------------------------------------------------------------
# PATCH /tests/{id}  —  general update (draft / rejected)
# ---------------------------------------------------------------------------


@router.patch("/{test_id}", response_model=TestOut)
def update_test(
    test_id: uuid.UUID,
    payload: TestUpdate,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """Update one or more fields of an existing test.

    Only the original creator or an admin can update.
    The test must be in ``draft`` or ``rejected`` state.
    """
    test = _get_test_or_404(db, test_id)

    if current_user.role != "admin" and test.created_by != current_user.id:
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN,
            detail="Not enough permissions",
        )

    if test.state not in (TestState.draft, TestState.rejected):
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=f"Cannot update a test in '{test.state.value}' state (must be draft or rejected)",
        )

    update_data = payload.model_dump(exclude_unset=True)
    for field, value in update_data.items():
        setattr(test, field, value)

    db.commit()
    db.refresh(test)

    log_action(
        db,
        user_id=current_user.id,
        action="update_test",
        entity_type="test",
        entity_id=test.id,
        details={"updated_fields": list(update_data.keys())},
    )

    return test


# ---------------------------------------------------------------------------
# PATCH /tests/{id}/red  —  Red Team update (draft, red_executing)
# ---------------------------------------------------------------------------


@router.patch("/{test_id}/red", response_model=TestOut)
def update_test_red(
    test_id: uuid.UUID,
    payload: TestRedUpdate,
    db: Session = Depends(get_db),
    current_user: User = Depends(require_any_role("red_tech")),
):
    """Red Team updates their fields (allowed in ``draft`` and ``red_executing``)."""
    test = _get_test_or_404(db, test_id)

    if test.state not in (TestState.draft, TestState.red_executing):
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=f"Cannot update red fields in '{test.state.value}' state (must be draft or red_executing)",
        )

    update_data = payload.model_dump(exclude_unset=True)
    for field, value in update_data.items():
        setattr(test, field, value)

    db.commit()
    db.refresh(test)

    log_action(
        db,
        user_id=current_user.id,
        action="update_test_red",
        entity_type="test",
        entity_id=test.id,
        details={"updated_fields": list(update_data.keys())},
    )

    return test


# ---------------------------------------------------------------------------
# PATCH /tests/{id}/blue  —  Blue Team update (blue_evaluating only)
# ---------------------------------------------------------------------------


@router.patch("/{test_id}/blue", response_model=TestOut)
def update_test_blue(
    test_id: uuid.UUID,
    payload: TestBlueUpdate,
    db: Session = Depends(get_db),
    current_user: User = Depends(require_any_role("blue_tech")),
):
    """Blue Team updates their fields (allowed only in ``blue_evaluating``)."""
    test = _get_test_or_404(db, test_id)

    if test.state != TestState.blue_evaluating:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=f"Cannot update blue fields in '{test.state.value}' state (must be blue_evaluating)",
        )

    update_data = payload.model_dump(exclude_unset=True)
    for field, value in update_data.items():
        setattr(test, field, value)

    db.commit()
    db.refresh(test)

    log_action(
        db,
        user_id=current_user.id,
        action="update_test_blue",
        entity_type="test",
        entity_id=test.id,
        details={"updated_fields": list(update_data.keys())},
    )

    return test


# ---------------------------------------------------------------------------
# POST /tests/{id}/start-execution  —  draft → red_executing
# ---------------------------------------------------------------------------


@router.post("/{test_id}/start-execution", response_model=TestOut)
def start_execution(
    test_id: uuid.UUID,
    db: Session = Depends(get_db),
    current_user: User = Depends(require_any_role("red_tech")),
):
    """Move a test from ``draft`` to ``red_executing``."""
    test = _get_test_or_404(db, test_id)
    test = wf_start_execution(db, test, current_user)
    db.refresh(test)
    return test


# ---------------------------------------------------------------------------
# POST /tests/{id}/submit-red  —  red_executing → blue_evaluating
# ---------------------------------------------------------------------------


@router.post("/{test_id}/submit-red", response_model=TestOut)
def submit_red(
    test_id: uuid.UUID,
    db: Session = Depends(get_db),
    current_user: User = Depends(require_any_role("red_tech")),
):
    """Red Team finalises — move from ``red_executing`` to ``blue_evaluating``."""
    test = _get_test_or_404(db, test_id)
    test = wf_submit_red(db, test, current_user)
    db.refresh(test)
    return test


# ---------------------------------------------------------------------------
# POST /tests/{id}/submit-blue  —  blue_evaluating → in_review
# ---------------------------------------------------------------------------


@router.post("/{test_id}/submit-blue", response_model=TestOut)
def submit_blue(
    test_id: uuid.UUID,
    db: Session = Depends(get_db),
    current_user: User = Depends(require_any_role("blue_tech")),
):
    """Blue Team finalises — move from ``blue_evaluating`` to ``in_review``."""
    test = _get_test_or_404(db, test_id)
    test = wf_submit_blue(db, test, current_user)
    db.refresh(test)
    return test


# ---------------------------------------------------------------------------
# POST /tests/{id}/validate-red  —  Red Lead validates
# ---------------------------------------------------------------------------


@router.post("/{test_id}/validate-red", response_model=TestOut)
def validate_red(
    test_id: uuid.UUID,
    payload: TestRedValidate,
    db: Session = Depends(get_db),
    current_user: User = Depends(require_any_role("red_lead")),
):
    """Red Lead approves or rejects the red side of a test."""
    test = _get_test_with_technique(db, test_id)
    test = wf_validate_red(
        db, test, current_user,
        validation_status=payload.red_validation_status,
        notes=payload.red_validation_notes,
    )

    # Recalculate technique status if test reached a terminal state
    if test.state in (TestState.validated, TestState.rejected):
        recalculate_technique_status(db, test.technique)

    db.refresh(test)
    return test


# ---------------------------------------------------------------------------
# POST /tests/{id}/validate-blue  —  Blue Lead validates
# ---------------------------------------------------------------------------


@router.post("/{test_id}/validate-blue", response_model=TestOut)
def validate_blue(
    test_id: uuid.UUID,
    payload: TestBlueValidate,
    db: Session = Depends(get_db),
    current_user: User = Depends(require_any_role("blue_lead")),
):
    """Blue Lead approves or rejects the blue side of a test."""
    test = _get_test_with_technique(db, test_id)
    test = wf_validate_blue(
        db, test, current_user,
        validation_status=payload.blue_validation_status,
        notes=payload.blue_validation_notes,
    )

    # Recalculate technique status if test reached a terminal state
    if test.state in (TestState.validated, TestState.rejected):
        recalculate_technique_status(db, test.technique)

    db.refresh(test)
    return test


# ---------------------------------------------------------------------------
# POST /tests/{id}/reopen  —  rejected → draft
# ---------------------------------------------------------------------------


@router.post("/{test_id}/reopen", response_model=TestOut)
def reopen(
    test_id: uuid.UUID,
    db: Session = Depends(get_db),
    current_user: User = Depends(require_any_role("red_lead", "blue_lead")),
):
    """Reopen a rejected test, moving it back to ``draft``."""
    test = _get_test_or_404(db, test_id)
    test = wf_reopen(db, test, current_user)
    db.refresh(test)
    return test


# ---------------------------------------------------------------------------
# GET /tests/{id}/timeline  —  audit history for this test
# ---------------------------------------------------------------------------


@router.get("/{test_id}/timeline")
def get_test_timeline(
    test_id: uuid.UUID,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """Return the chronological audit-log history for a test."""
    # Verify the test exists
    _get_test_or_404(db, test_id)

    logs = (
        db.query(AuditLog)
        .filter(
            AuditLog.entity_type == "test",
            AuditLog.entity_id == str(test_id),
        )
        .order_by(AuditLog.timestamp.asc())
        .all()
    )

    return [
        {
            "id": str(log.id),
            "action": log.action,
            "user_id": str(log.user_id) if log.user_id else None,
            "timestamp": log.timestamp.isoformat() if log.timestamp else None,
            "details": log.details,
        }
        for log in logs
    ]