"""
Code Quality API Endpoints
RESTful API for architecture validation and violation management
"""

from datetime import datetime

from fastapi import APIRouter, Depends, Query
from pydantic import BaseModel, Field
from sqlalchemy.orm import Session

from app.api.deps import get_current_admin_api
from app.core.database import get_db
from app.exceptions import ViolationNotFoundException
from app.services.code_quality_service import code_quality_service
from models.database.user import User
from models.schema.stats import CodeQualityDashboardStatsResponse

router = APIRouter()


# Pydantic Models for API


class ScanResponse(BaseModel):
    """Response model for a scan"""

    id: int
    timestamp: str
    total_files: int
    total_violations: int
    errors: int
    warnings: int
    duration_seconds: float
    triggered_by: str
    git_commit_hash: str | None

    class Config:
        from_attributes = True


class ViolationResponse(BaseModel):
    """Response model for a violation"""

    id: int
    scan_id: int
    rule_id: str
    rule_name: str
    severity: str
    file_path: str
    line_number: int
    message: str
    context: str | None
    suggestion: str | None
    status: str
    assigned_to: int | None
    resolved_at: str | None
    resolved_by: int | None
    resolution_note: str | None
    created_at: str

    class Config:
        from_attributes = True


class ViolationListResponse(BaseModel):
    """Response model for paginated violations list"""

    violations: list[ViolationResponse]
    total: int
    page: int
    page_size: int
    total_pages: int


class ViolationDetailResponse(ViolationResponse):
    """Response model for single violation with relationships"""

    assignments: list = []
    comments: list = []


class AssignViolationRequest(BaseModel):
    """Request model for assigning a violation"""

    user_id: int = Field(..., description="User ID to assign to")
    due_date: datetime | None = Field(None, description="Due date for resolution")
    priority: str = Field(
        "medium", description="Priority level (low, medium, high, critical)"
    )


class ResolveViolationRequest(BaseModel):
    """Request model for resolving a violation"""

    resolution_note: str = Field(..., description="Note about the resolution")


class IgnoreViolationRequest(BaseModel):
    """Request model for ignoring a violation"""

    reason: str = Field(..., description="Reason for ignoring")


class AddCommentRequest(BaseModel):
    """Request model for adding a comment"""

    comment: str = Field(..., min_length=1, description="Comment text")


# API Endpoints


@router.post("/scan", response_model=ScanResponse)
async def trigger_scan(
    db: Session = Depends(get_db), current_user: User = Depends(get_current_admin_api)
):
    """
    Trigger a new architecture scan

    Requires authentication. Runs the validator script and stores results.
    Domain exceptions (ScanTimeoutException, ScanParseException) bubble up to global handler.
    """
    scan = code_quality_service.run_scan(
        db, triggered_by=f"manual:{current_user.username}"
    )
    db.commit()

    return ScanResponse(
        id=scan.id,
        timestamp=scan.timestamp.isoformat(),
        total_files=scan.total_files,
        total_violations=scan.total_violations,
        errors=scan.errors,
        warnings=scan.warnings,
        duration_seconds=scan.duration_seconds,
        triggered_by=scan.triggered_by,
        git_commit_hash=scan.git_commit_hash,
    )


@router.get("/scans", response_model=list[ScanResponse])
async def list_scans(
    limit: int = Query(30, ge=1, le=100, description="Number of scans to return"),
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_admin_api),
):
    """
    Get scan history

    Returns recent scans for trend analysis.
    """
    scans = code_quality_service.get_scan_history(db, limit=limit)

    return [
        ScanResponse(
            id=scan.id,
            timestamp=scan.timestamp.isoformat(),
            total_files=scan.total_files,
            total_violations=scan.total_violations,
            errors=scan.errors,
            warnings=scan.warnings,
            duration_seconds=scan.duration_seconds,
            triggered_by=scan.triggered_by,
            git_commit_hash=scan.git_commit_hash,
        )
        for scan in scans
    ]


@router.get("/violations", response_model=ViolationListResponse)
async def list_violations(
    scan_id: int | None = Query(
        None, description="Filter by scan ID (defaults to latest)"
    ),
    severity: str | None = Query(
        None, description="Filter by severity (error, warning)"
    ),
    status: str | None = Query(
        None, description="Filter by status (open, assigned, resolved, ignored)"
    ),
    rule_id: str | None = Query(None, description="Filter by rule ID"),
    file_path: str | None = Query(
        None, description="Filter by file path (partial match)"
    ),
    page: int = Query(1, ge=1, description="Page number"),
    page_size: int = Query(50, ge=1, le=200, description="Items per page"),
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_admin_api),
):
    """
    Get violations with filtering and pagination

    Returns violations from latest scan by default.
    """
    offset = (page - 1) * page_size

    violations, total = code_quality_service.get_violations(
        db,
        scan_id=scan_id,
        severity=severity,
        status=status,
        rule_id=rule_id,
        file_path=file_path,
        limit=page_size,
        offset=offset,
    )

    total_pages = (total + page_size - 1) // page_size

    return ViolationListResponse(
        violations=[
            ViolationResponse(
                id=v.id,
                scan_id=v.scan_id,
                rule_id=v.rule_id,
                rule_name=v.rule_name,
                severity=v.severity,
                file_path=v.file_path,
                line_number=v.line_number,
                message=v.message,
                context=v.context,
                suggestion=v.suggestion,
                status=v.status,
                assigned_to=v.assigned_to,
                resolved_at=v.resolved_at.isoformat() if v.resolved_at else None,
                resolved_by=v.resolved_by,
                resolution_note=v.resolution_note,
                created_at=v.created_at.isoformat(),
            )
            for v in violations
        ],
        total=total,
        page=page,
        page_size=page_size,
        total_pages=total_pages,
    )


@router.get("/violations/{violation_id}", response_model=ViolationDetailResponse)
async def get_violation(
    violation_id: int,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_admin_api),
):
    """
    Get single violation with details

    Includes assignments and comments.
    """
    violation = code_quality_service.get_violation_by_id(db, violation_id)

    if not violation:
        raise ViolationNotFoundException(violation_id)

    # Format assignments
    assignments = [
        {
            "id": a.id,
            "user_id": a.user_id,
            "assigned_at": a.assigned_at.isoformat(),
            "assigned_by": a.assigned_by,
            "due_date": a.due_date.isoformat() if a.due_date else None,
            "priority": a.priority,
        }
        for a in violation.assignments
    ]

    # Format comments
    comments = [
        {
            "id": c.id,
            "user_id": c.user_id,
            "comment": c.comment,
            "created_at": c.created_at.isoformat(),
        }
        for c in violation.comments
    ]

    return ViolationDetailResponse(
        id=violation.id,
        scan_id=violation.scan_id,
        rule_id=violation.rule_id,
        rule_name=violation.rule_name,
        severity=violation.severity,
        file_path=violation.file_path,
        line_number=violation.line_number,
        message=violation.message,
        context=violation.context,
        suggestion=violation.suggestion,
        status=violation.status,
        assigned_to=violation.assigned_to,
        resolved_at=(
            violation.resolved_at.isoformat() if violation.resolved_at else None
        ),
        resolved_by=violation.resolved_by,
        resolution_note=violation.resolution_note,
        created_at=violation.created_at.isoformat(),
        assignments=assignments,
        comments=comments,
    )


@router.post("/violations/{violation_id}/assign")
async def assign_violation(
    violation_id: int,
    request: AssignViolationRequest,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_admin_api),
):
    """
    Assign violation to a developer

    Updates violation status to 'assigned'.
    """
    assignment = code_quality_service.assign_violation(
        db,
        violation_id=violation_id,
        user_id=request.user_id,
        assigned_by=current_user.id,
        due_date=request.due_date,
        priority=request.priority,
    )
    db.commit()

    return {
        "id": assignment.id,
        "violation_id": assignment.violation_id,
        "user_id": assignment.user_id,
        "assigned_at": assignment.assigned_at.isoformat(),
        "assigned_by": assignment.assigned_by,
        "due_date": (
            assignment.due_date.isoformat() if assignment.due_date else None
        ),
        "priority": assignment.priority,
    }


@router.post("/violations/{violation_id}/resolve")
async def resolve_violation(
    violation_id: int,
    request: ResolveViolationRequest,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_admin_api),
):
    """
    Mark violation as resolved

    Records resolution timestamp and user.
    ViolationNotFoundException bubbles up if violation doesn't exist.
    """
    violation = code_quality_service.resolve_violation(
        db,
        violation_id=violation_id,
        resolved_by=current_user.id,
        resolution_note=request.resolution_note,
    )
    db.commit()

    return {
        "id": violation.id,
        "status": violation.status,
        "resolved_at": (
            violation.resolved_at.isoformat() if violation.resolved_at else None
        ),
        "resolved_by": violation.resolved_by,
        "resolution_note": violation.resolution_note,
    }


@router.post("/violations/{violation_id}/ignore")
async def ignore_violation(
    violation_id: int,
    request: IgnoreViolationRequest,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_admin_api),
):
    """
    Mark violation as ignored (won't fix)

    Records reason for ignoring.
    ViolationNotFoundException bubbles up if violation doesn't exist.
    """
    violation = code_quality_service.ignore_violation(
        db,
        violation_id=violation_id,
        ignored_by=current_user.id,
        reason=request.reason,
    )
    db.commit()

    return {
        "id": violation.id,
        "status": violation.status,
        "resolved_at": (
            violation.resolved_at.isoformat() if violation.resolved_at else None
        ),
        "resolved_by": violation.resolved_by,
        "resolution_note": violation.resolution_note,
    }


@router.post("/violations/{violation_id}/comments")
async def add_comment(
    violation_id: int,
    request: AddCommentRequest,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_admin_api),
):
    """
    Add comment to violation

    For team collaboration and discussion.
    """
    comment = code_quality_service.add_comment(
        db,
        violation_id=violation_id,
        user_id=current_user.id,
        comment=request.comment,
    )
    db.commit()

    return {
        "id": comment.id,
        "violation_id": comment.violation_id,
        "user_id": comment.user_id,
        "comment": comment.comment,
        "created_at": comment.created_at.isoformat(),
    }


@router.get("/stats", response_model=CodeQualityDashboardStatsResponse)
async def get_dashboard_stats(
    db: Session = Depends(get_db), current_user: User = Depends(get_current_admin_api)
):
    """
    Get dashboard statistics

    Returns comprehensive stats for the dashboard including:
    - Total counts by severity and status
    - Technical debt score
    - Trend data (last 7 scans)
    - Top violating files
    - Violations by rule and module
    """
    stats = code_quality_service.get_dashboard_stats(db)

    return CodeQualityDashboardStatsResponse(**stats)