"""FastAPI route definitions."""

from pathlib import Path

from fastapi import APIRouter, HTTPException
from pydantic import BaseModel

import atocore.config as _config
from atocore.context.builder import (
    build_context,
    get_last_context_pack,
    _pack_to_dict,
)
from atocore.context.project_state import (
    CATEGORIES,
    get_state,
    invalidate_state,
    set_state,
)
from atocore.ingestion.pipeline import (
    get_ingestion_stats,
    get_source_status,
    ingest_configured_sources,
    ingest_file,
    ingest_folder,
)
from atocore.memory.service import (
    MEMORY_TYPES,
    create_memory,
    get_memories,
    invalidate_memory,
    supersede_memory,
    update_memory,
)
from atocore.observability.logger import get_logger
from atocore.retrieval.retriever import retrieve
from atocore.retrieval.vector_store import get_vector_store

router = APIRouter()
log = get_logger("api")


# --- Request/Response models ---


class IngestRequest(BaseModel):
    path: str


class IngestResponse(BaseModel):
    results: list[dict]


class IngestSourcesResponse(BaseModel):
    results: list[dict]


class QueryRequest(BaseModel):
    prompt: str
    top_k: int = 10
    filter_tags: list[str] | None = None


class QueryResponse(BaseModel):
    results: list[dict]


class ContextBuildRequest(BaseModel):
    prompt: str
    project: str | None = None
    budget: int | None = None


class ContextBuildResponse(BaseModel):
    formatted_context: str
    full_prompt: str
    chunks_used: int
    total_chars: int
    budget: int
    budget_remaining: int
    duration_ms: int
    chunks: list[dict]


class MemoryCreateRequest(BaseModel):
    memory_type: str
    content: str
    project: str = ""
    confidence: float = 1.0


class MemoryUpdateRequest(BaseModel):
    content: str | None = None
    confidence: float | None = None
    status: str | None = None


class ProjectStateSetRequest(BaseModel):
    project: str
    category: str
    key: str
    value: str
    source: str = ""
    confidence: float = 1.0


class ProjectStateGetRequest(BaseModel):
    project: str
    category: str | None = None


class ProjectStateInvalidateRequest(BaseModel):
    project: str
    category: str
    key: str


# --- Endpoints ---


@router.post("/ingest", response_model=IngestResponse)
def api_ingest(req: IngestRequest) -> IngestResponse:
    """Ingest a markdown file or folder."""
    target = Path(req.path)
    try:
        if target.is_file():
            results = [ingest_file(target)]
        elif target.is_dir():
            results = ingest_folder(target)
        else:
            raise HTTPException(status_code=404, detail=f"Path not found: {req.path}")
    except HTTPException:
        raise
    except Exception as e:
        log.error("ingest_failed", path=req.path, error=str(e))
        raise HTTPException(status_code=500, detail=f"Ingestion failed: {e}")
    return IngestResponse(results=results)


@router.post("/ingest/sources", response_model=IngestSourcesResponse)
def api_ingest_sources() -> IngestSourcesResponse:
    """Ingest enabled configured source directories."""
    try:
        results = ingest_configured_sources()
    except Exception as e:
        log.error("ingest_sources_failed", error=str(e))
        raise HTTPException(status_code=500, detail=f"Configured source ingestion failed: {e}")
    return IngestSourcesResponse(results=results)


@router.post("/query", response_model=QueryResponse)
def api_query(req: QueryRequest) -> QueryResponse:
    """Retrieve relevant chunks for a prompt."""
    try:
        chunks = retrieve(req.prompt, top_k=req.top_k, filter_tags=req.filter_tags)
    except Exception as e:
        log.error("query_failed", prompt=req.prompt[:100], error=str(e))
        raise HTTPException(status_code=500, detail=f"Query failed: {e}")
    return QueryResponse(
        results=[
            {
                "chunk_id": c.chunk_id,
                "content": c.content,
                "score": c.score,
                "heading_path": c.heading_path,
                "source_file": c.source_file,
                "title": c.title,
            }
            for c in chunks
        ]
    )


@router.post("/context/build", response_model=ContextBuildResponse)
def api_build_context(req: ContextBuildRequest) -> ContextBuildResponse:
    """Build a full context pack for a prompt."""
    try:
        pack = build_context(
            user_prompt=req.prompt,
            project_hint=req.project,
            budget=req.budget,
        )
    except Exception as e:
        log.error("context_build_failed", prompt=req.prompt[:100], error=str(e))
        raise HTTPException(status_code=500, detail=f"Context build failed: {e}")
    pack_dict = _pack_to_dict(pack)
    return ContextBuildResponse(
        formatted_context=pack.formatted_context,
        full_prompt=pack.full_prompt,
        chunks_used=len(pack.chunks_used),
        total_chars=pack.total_chars,
        budget=pack.budget,
        budget_remaining=pack.budget_remaining,
        duration_ms=pack.duration_ms,
        chunks=pack_dict["chunks"],
    )


@router.post("/memory")
def api_create_memory(req: MemoryCreateRequest) -> dict:
    """Create a new memory entry."""
    try:
        mem = create_memory(
            memory_type=req.memory_type,
            content=req.content,
            project=req.project,
            confidence=req.confidence,
        )
    except ValueError as e:
        raise HTTPException(status_code=400, detail=str(e))
    return {"status": "ok", "id": mem.id, "memory_type": mem.memory_type}


@router.get("/memory")
def api_get_memories(
    memory_type: str | None = None,
    project: str | None = None,
    active_only: bool = True,
    min_confidence: float = 0.0,
    limit: int = 50,
) -> dict:
    """List memories, optionally filtered."""
    memories = get_memories(
        memory_type=memory_type,
        project=project,
        active_only=active_only,
        min_confidence=min_confidence,
        limit=limit,
    )
    return {
        "memories": [
            {
                "id": m.id,
                "memory_type": m.memory_type,
                "content": m.content,
                "project": m.project,
                "confidence": m.confidence,
                "status": m.status,
                "updated_at": m.updated_at,
            }
            for m in memories
        ],
        "types": MEMORY_TYPES,
    }


@router.put("/memory/{memory_id}")
def api_update_memory(memory_id: str, req: MemoryUpdateRequest) -> dict:
    """Update an existing memory."""
    try:
        success = update_memory(
            memory_id=memory_id,
            content=req.content,
            confidence=req.confidence,
            status=req.status,
        )
    except ValueError as e:
        raise HTTPException(status_code=400, detail=str(e))
    if not success:
        raise HTTPException(status_code=404, detail="Memory not found")
    return {"status": "updated", "id": memory_id}


@router.delete("/memory/{memory_id}")
def api_invalidate_memory(memory_id: str) -> dict:
    """Invalidate a memory (error correction)."""
    success = invalidate_memory(memory_id)
    if not success:
        raise HTTPException(status_code=404, detail="Memory not found")
    return {"status": "invalidated", "id": memory_id}


@router.post("/project/state")
def api_set_project_state(req: ProjectStateSetRequest) -> dict:
    """Set or update a trusted project state entry."""
    try:
        entry = set_state(
            project_name=req.project,
            category=req.category,
            key=req.key,
            value=req.value,
            source=req.source,
            confidence=req.confidence,
        )
    except ValueError as e:
        raise HTTPException(status_code=400, detail=str(e))
    except Exception as e:
        log.error("set_state_failed", error=str(e))
        raise HTTPException(status_code=500, detail=f"Failed to set state: {e}")
    return {"status": "ok", "id": entry.id, "category": entry.category, "key": entry.key}


@router.get("/project/state/{project_name}")
def api_get_project_state(project_name: str, category: str | None = None) -> dict:
    """Get trusted project state entries."""
    entries = get_state(project_name, category=category)
    return {
        "project": project_name,
        "entries": [
            {
                "id": e.id,
                "category": e.category,
                "key": e.key,
                "value": e.value,
                "source": e.source,
                "confidence": e.confidence,
                "status": e.status,
                "updated_at": e.updated_at,
            }
            for e in entries
        ],
        "categories": CATEGORIES,
    }


@router.delete("/project/state")
def api_invalidate_project_state(req: ProjectStateInvalidateRequest) -> dict:
    """Invalidate (supersede) a project state entry."""
    success = invalidate_state(req.project, req.category, req.key)
    if not success:
        raise HTTPException(status_code=404, detail="State entry not found or already invalidated")
    return {"status": "invalidated", "project": req.project, "category": req.category, "key": req.key}


@router.get("/health")
def api_health() -> dict:
    """Health check."""
    store = get_vector_store()
    source_status = get_source_status()
    return {
        "status": "ok",
        "version": "0.1.0",
        "vectors_count": store.count,
        "env": _config.settings.env,
        "machine_paths": {
            "db_path": str(_config.settings.db_path),
            "chroma_path": str(_config.settings.chroma_path),
            "log_dir": str(_config.settings.resolved_log_dir),
            "backup_dir": str(_config.settings.resolved_backup_dir),
            "run_dir": str(_config.settings.resolved_run_dir),
        },
        "sources_ready": all(
            (not source["enabled"]) or (source["exists"] and source["is_dir"])
            for source in source_status
        ),
        "source_status": source_status,
    }


@router.get("/sources")
def api_sources() -> dict:
    """Return configured ingestion source directories and readiness."""
    return {
        "sources": get_source_status(),
        "vault_enabled": _config.settings.source_vault_enabled,
        "drive_enabled": _config.settings.source_drive_enabled,
    }


@router.get("/stats")
def api_stats() -> dict:
    """Ingestion statistics."""
    return get_ingestion_stats()


@router.get("/debug/context")
def api_debug_context() -> dict:
    """Inspect the last assembled context pack."""
    pack = get_last_context_pack()
    if pack is None:
        return {"message": "No context pack built yet."}
    return _pack_to_dict(pack)