"""
FastAPI routes for the Control Generator Pipeline.

Endpoints:
  POST /v1/canonical/generate                     — Start generation run
  GET  /v1/canonical/generate/status/{job_id}     — Job status
  GET  /v1/canonical/generate/jobs                — All jobs
  GET  /v1/canonical/generate/review-queue        — Controls needing review
  POST /v1/canonical/generate/review/{control_id} — Complete review
  GET  /v1/canonical/generate/processed-stats     — Processing stats per collection
  GET  /v1/canonical/blocked-sources              — Blocked sources list
  POST /v1/canonical/blocked-sources/cleanup      — Start cleanup workflow
"""

import json
import logging
from typing import Optional, List

from fastapi import APIRouter, HTTPException, Query
from pydantic import BaseModel
from sqlalchemy import text

from database import SessionLocal
from compliance.services.control_generator import (
    ControlGeneratorPipeline,
    GeneratorConfig,
    ALL_COLLECTIONS,
)
from compliance.services.rag_client import get_rag_client

logger = logging.getLogger(__name__)
router = APIRouter(prefix="/v1/canonical", tags=["control-generator"])


# =============================================================================
# REQUEST / RESPONSE MODELS
# =============================================================================

class GenerateRequest(BaseModel):
    domain: Optional[str] = None
    collections: Optional[List[str]] = None
    max_controls: int = 50
    batch_size: int = 5
    skip_web_search: bool = False
    dry_run: bool = False


class GenerateResponse(BaseModel):
    job_id: str
    status: str
    message: str
    total_chunks_scanned: int = 0
    controls_generated: int = 0
    controls_verified: int = 0
    controls_needs_review: int = 0
    controls_too_close: int = 0
    controls_duplicates_found: int = 0
    errors: list = []
    controls: list = []


class ReviewRequest(BaseModel):
    action: str  # "approve", "reject", "needs_rework"
    release_state: Optional[str] = None  # Override release_state
    notes: Optional[str] = None


class ProcessedStats(BaseModel):
    collection: str
    total_chunks_estimated: int
    processed_chunks: int
    pending_chunks: int
    direct_adopted: int
    llm_reformed: int
    skipped: int


class BlockedSourceResponse(BaseModel):
    id: str
    regulation_code: str
    document_title: str
    reason: str
    deletion_status: str
    qdrant_collection: Optional[str] = None
    marked_at: str


# =============================================================================
# ENDPOINTS
# =============================================================================

@router.post("/generate", response_model=GenerateResponse)
async def start_generation(req: GenerateRequest):
    """Start a control generation run."""
    config = GeneratorConfig(
        collections=req.collections,
        domain=req.domain,
        batch_size=req.batch_size,
        max_controls=req.max_controls,
        skip_web_search=req.skip_web_search,
        dry_run=req.dry_run,
    )

    db = SessionLocal()
    try:
        pipeline = ControlGeneratorPipeline(db=db, rag_client=get_rag_client())
        result = await pipeline.run(config)

        return GenerateResponse(
            job_id=result.job_id,
            status=result.status,
            message=f"Generated {result.controls_generated} controls from {result.total_chunks_scanned} chunks",
            total_chunks_scanned=result.total_chunks_scanned,
            controls_generated=result.controls_generated,
            controls_verified=result.controls_verified,
            controls_needs_review=result.controls_needs_review,
            controls_too_close=result.controls_too_close,
            controls_duplicates_found=result.controls_duplicates_found,
            errors=result.errors,
            controls=result.controls if req.dry_run else [],
        )
    except Exception as e:
        logger.error("Generation failed: %s", e)
        raise HTTPException(status_code=500, detail=str(e))
    finally:
        db.close()


@router.get("/generate/status/{job_id}")
async def get_job_status(job_id: str):
    """Get status of a generation job."""
    db = SessionLocal()
    try:
        result = db.execute(
            text("SELECT * FROM canonical_generation_jobs WHERE id = :id::uuid"),
            {"id": job_id},
        )
        row = result.fetchone()
        if not row:
            raise HTTPException(status_code=404, detail="Job not found")

        cols = result.keys()
        job = dict(zip(cols, row))
        # Serialize datetime fields
        for key in ("started_at", "completed_at", "created_at"):
            if job.get(key):
                job[key] = str(job[key])
        job["id"] = str(job["id"])
        return job
    finally:
        db.close()


@router.get("/generate/jobs")
async def list_jobs(
    limit: int = Query(20, ge=1, le=100),
    offset: int = Query(0, ge=0),
):
    """List all generation jobs."""
    db = SessionLocal()
    try:
        result = db.execute(
            text("""
                SELECT id, status, total_chunks_scanned, controls_generated,
                       controls_verified, controls_needs_review, controls_too_close,
                       controls_duplicates_found, created_at, completed_at
                FROM canonical_generation_jobs
                ORDER BY created_at DESC
                LIMIT :limit OFFSET :offset
            """),
            {"limit": limit, "offset": offset},
        )
        jobs = []
        cols = result.keys()
        for row in result:
            job = dict(zip(cols, row))
            job["id"] = str(job["id"])
            for key in ("created_at", "completed_at"):
                if job.get(key):
                    job[key] = str(job[key])
            jobs.append(job)
        return {"jobs": jobs, "total": len(jobs)}
    finally:
        db.close()


@router.get("/generate/review-queue")
async def get_review_queue(
    release_state: str = Query("needs_review", pattern="^(needs_review|too_close|duplicate)$"),
    limit: int = Query(50, ge=1, le=200),
):
    """Get controls that need manual review."""
    db = SessionLocal()
    try:
        result = db.execute(
            text("""
                SELECT c.id, c.control_id, c.title, c.objective, c.severity,
                       c.release_state, c.license_rule, c.customer_visible,
                       c.generation_metadata, c.open_anchors, c.tags,
                       c.created_at
                FROM canonical_controls c
                WHERE c.release_state = :state
                ORDER BY c.created_at DESC
                LIMIT :limit
            """),
            {"state": release_state, "limit": limit},
        )
        controls = []
        cols = result.keys()
        for row in result:
            ctrl = dict(zip(cols, row))
            ctrl["id"] = str(ctrl["id"])
            ctrl["created_at"] = str(ctrl["created_at"])
            # Parse JSON fields
            for jf in ("generation_metadata", "open_anchors", "tags"):
                if isinstance(ctrl.get(jf), str):
                    try:
                        ctrl[jf] = json.loads(ctrl[jf])
                    except (json.JSONDecodeError, TypeError):
                        pass
            controls.append(ctrl)
        return {"controls": controls, "total": len(controls)}
    finally:
        db.close()


@router.post("/generate/review/{control_id}")
async def review_control(control_id: str, req: ReviewRequest):
    """Complete review of a generated control."""
    db = SessionLocal()
    try:
        # Validate control exists and is in reviewable state
        result = db.execute(
            text("SELECT id, release_state FROM canonical_controls WHERE control_id = :cid"),
            {"cid": control_id},
        )
        row = result.fetchone()
        if not row:
            raise HTTPException(status_code=404, detail="Control not found")

        current_state = row[1]
        if current_state not in ("needs_review", "too_close", "duplicate"):
            raise HTTPException(status_code=400, detail=f"Control is in state '{current_state}', not reviewable")

        # Determine new state
        if req.action == "approve":
            new_state = req.release_state or "draft"
        elif req.action == "reject":
            new_state = "deprecated"
        elif req.action == "needs_rework":
            new_state = "needs_review"
        else:
            raise HTTPException(status_code=400, detail=f"Unknown action: {req.action}")

        if new_state not in ("draft", "review", "approved", "deprecated", "needs_review", "too_close", "duplicate"):
            raise HTTPException(status_code=400, detail=f"Invalid release_state: {new_state}")

        db.execute(
            text("""
                UPDATE canonical_controls
                SET release_state = :state, updated_at = NOW()
                WHERE control_id = :cid
            """),
            {"state": new_state, "cid": control_id},
        )
        db.commit()

        return {"control_id": control_id, "release_state": new_state, "action": req.action}
    finally:
        db.close()


@router.get("/generate/processed-stats")
async def get_processed_stats():
    """Get processing statistics per collection."""
    db = SessionLocal()
    try:
        result = db.execute(
            text("""
                SELECT
                    collection,
                    COUNT(*) as processed_chunks,
                    COUNT(*) FILTER (WHERE processing_path = 'structured') as direct_adopted,
                    COUNT(*) FILTER (WHERE processing_path = 'llm_reform') as llm_reformed,
                    COUNT(*) FILTER (WHERE processing_path = 'skipped') as skipped
                FROM canonical_processed_chunks
                GROUP BY collection
                ORDER BY collection
            """)
        )
        stats = []
        cols = result.keys()
        for row in result:
            stat = dict(zip(cols, row))
            stat["total_chunks_estimated"] = 0  # Would need Qdrant API to get total
            stat["pending_chunks"] = 0
            stats.append(stat)
        return {"stats": stats}
    finally:
        db.close()


# =============================================================================
# BLOCKED SOURCES
# =============================================================================

@router.get("/blocked-sources")
async def list_blocked_sources():
    """List all blocked (Rule 3) sources."""
    db = SessionLocal()
    try:
        result = db.execute(
            text("""
                SELECT id, regulation_code, document_title, reason,
                       deletion_status, qdrant_collection, marked_at
                FROM canonical_blocked_sources
                ORDER BY marked_at DESC
            """)
        )
        sources = []
        cols = result.keys()
        for row in result:
            src = dict(zip(cols, row))
            src["id"] = str(src["id"])
            src["marked_at"] = str(src["marked_at"])
            sources.append(src)
        return {"sources": sources}
    finally:
        db.close()


@router.post("/blocked-sources/cleanup")
async def start_cleanup():
    """Start cleanup workflow for blocked sources.

    This marks all pending blocked sources for deletion.
    Actual RAG chunk deletion and file removal is a separate manual step.
    """
    db = SessionLocal()
    try:
        result = db.execute(
            text("""
                UPDATE canonical_blocked_sources
                SET deletion_status = 'marked_for_deletion'
                WHERE deletion_status = 'pending'
                RETURNING regulation_code
            """)
        )
        marked = [row[0] for row in result]
        db.commit()

        return {
            "status": "marked_for_deletion",
            "marked_count": len(marked),
            "regulation_codes": marked,
            "message": "Sources marked for deletion. Run manual cleanup to remove RAG chunks and files.",
        }
    finally:
        db.close()


# =============================================================================
# CUSTOMER VIEW FILTER
# =============================================================================

@router.get("/controls-customer")
async def get_controls_customer_view(
    severity: Optional[str] = Query(None),
    domain: Optional[str] = Query(None),
):
    """Get controls filtered for customer visibility.

    Rule 3 controls have source_citation and source_original_text hidden.
    generation_metadata is NEVER shown to customers.
    """
    db = SessionLocal()
    try:
        query = """
            SELECT c.id, c.control_id, c.title, c.objective, c.rationale,
                   c.scope, c.requirements, c.test_procedure, c.evidence,
                   c.severity, c.risk_score, c.implementation_effort,
                   c.open_anchors, c.release_state, c.tags,
                   c.license_rule, c.customer_visible,
                   c.source_original_text, c.source_citation,
                   c.created_at, c.updated_at
            FROM canonical_controls c
            WHERE c.release_state IN ('draft', 'approved')
        """
        params: dict = {}

        if severity:
            query += " AND c.severity = :severity"
            params["severity"] = severity
        if domain:
            query += " AND c.control_id LIKE :domain"
            params["domain"] = f"{domain.upper()}-%"

        query += " ORDER BY c.control_id"

        result = db.execute(text(query), params)
        controls = []
        cols = result.keys()
        for row in result:
            ctrl = dict(zip(cols, row))
            ctrl["id"] = str(ctrl["id"])
            for key in ("created_at", "updated_at"):
                if ctrl.get(key):
                    ctrl[key] = str(ctrl[key])

            # Parse JSON fields
            for jf in ("scope", "requirements", "test_procedure", "evidence",
                        "open_anchors", "tags", "source_citation"):
                if isinstance(ctrl.get(jf), str):
                    try:
                        ctrl[jf] = json.loads(ctrl[jf])
                    except (json.JSONDecodeError, TypeError):
                        pass

            # Customer visibility rules:
            # - NEVER show generation_metadata
            # - Rule 3: NEVER show source_citation or source_original_text
            ctrl.pop("generation_metadata", None)
            if not ctrl.get("customer_visible", True):
                ctrl["source_citation"] = None
                ctrl["source_original_text"] = None

            controls.append(ctrl)

        return {"controls": controls, "total": len(controls)}
    finally:
        db.close()