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

from core_domain import ServiceHealth

from app.application.services import AgentApplicationService, build_agent_application_service
from app.bootstrap.settings import AgentServiceSettings
from app.db.session import get_db
from app.schemas.agent import (
    AgentCreateRequest,
    AgentResponse,
    AgentRunCreateRequest,
    AgentRunExecuteRequest,
    AgentRunExecuteResponse,
    AgentRunResponse,
    AgentRunStatusUpdateRequest,
    AgentStatusUpdateRequest,
    AgentToolInvocationResponse,
    AgentWorkerExecuteNextRequest,
    AgentWorkerExecuteNextResponse,
    AgentVersionCreateRequest,
    AgentVersionResponse,
)

router = APIRouter()


def get_agent_service_settings() -> AgentServiceSettings:
    return AgentServiceSettings()


def get_agent_application_service(
    db: Session = Depends(get_db),
    settings: AgentServiceSettings = Depends(get_agent_service_settings),
) -> AgentApplicationService:
    return build_agent_application_service(db=db, settings=settings)


@router.get("/health", response_model=ServiceHealth)
def health_check(db: Session = Depends(get_db)) -> ServiceHealth:
    db.execute(text("SELECT 1"))
    return ServiceHealth(service="agent-service", status="ok", database="ok")


@router.post("", response_model=AgentResponse)
def create_agent(
    payload: AgentCreateRequest,
    service: AgentApplicationService = Depends(get_agent_application_service),
) -> AgentResponse:
    entity = service.create_agent(payload)
    return AgentResponse.from_entity(entity)


@router.get("", response_model=list[AgentResponse])
def list_agents(
    tenant_id: str = Query(...),
    service: AgentApplicationService = Depends(get_agent_application_service),
) -> list[AgentResponse]:
    return [AgentResponse.from_entity(item) for item in service.list_agents(tenant_id=tenant_id)]


@router.patch("/{agent_id}/status", response_model=AgentResponse)
def update_agent_status(
    agent_id: str,
    payload: AgentStatusUpdateRequest,
    service: AgentApplicationService = Depends(get_agent_application_service),
) -> AgentResponse:
    entity = service.update_agent_status(agent_id=agent_id, payload=payload)
    if entity is None:
        raise HTTPException(status_code=404, detail=f"agent not found: {agent_id}")
    return AgentResponse.from_entity(entity)


@router.post("/versions", response_model=AgentVersionResponse)
def create_agent_version(
    payload: AgentVersionCreateRequest,
    service: AgentApplicationService = Depends(get_agent_application_service),
) -> AgentVersionResponse:
    try:
        entity = service.create_agent_version(payload)
    except ValueError as exc:
        raise HTTPException(status_code=422, detail=str(exc)) from exc
    return AgentVersionResponse.from_entity(entity)


@router.get("/versions", response_model=list[AgentVersionResponse])
def list_agent_versions(
    tenant_id: str = Query(...),
    agent_id: str = Query(...),
    service: AgentApplicationService = Depends(get_agent_application_service),
) -> list[AgentVersionResponse]:
    return [
        AgentVersionResponse.from_entity(item)
        for item in service.list_agent_versions(tenant_id=tenant_id, agent_id=agent_id)
    ]


@router.post("/runs", response_model=AgentRunResponse)
def create_agent_run(
    payload: AgentRunCreateRequest,
    service: AgentApplicationService = Depends(get_agent_application_service),
) -> AgentRunResponse:
    try:
        entity = service.create_agent_run(payload)
    except ValueError as exc:
        raise HTTPException(status_code=422, detail=str(exc)) from exc
    return AgentRunResponse.from_entity(entity)


@router.get("/runs", response_model=list[AgentRunResponse])
def list_agent_runs(
    tenant_id: str = Query(...),
    agent_id: str | None = Query(default=None),
    session_id: str | None = Query(default=None),
    service: AgentApplicationService = Depends(get_agent_application_service),
) -> list[AgentRunResponse]:
    return [
        AgentRunResponse.from_entity(item)
        for item in service.list_agent_runs(
            tenant_id=tenant_id,
            agent_id=agent_id,
            session_id=session_id,
        )
    ]


@router.get(
    "/runs/{agent_run_id}/tool-invocations",
    response_model=list[AgentToolInvocationResponse],
)
def list_agent_tool_invocations(
    agent_run_id: str,
    tenant_id: str = Query(...),
    service: AgentApplicationService = Depends(get_agent_application_service),
) -> list[AgentToolInvocationResponse]:
    return [
        AgentToolInvocationResponse.from_entity(item)
        for item in service.list_agent_tool_invocations(
            tenant_id=tenant_id,
            agent_run_id=agent_run_id,
        )
    ]


@router.post("/runs/{agent_run_id}/status", response_model=AgentRunResponse)
def update_agent_run_status(
    agent_run_id: str,
    payload: AgentRunStatusUpdateRequest,
    service: AgentApplicationService = Depends(get_agent_application_service),
) -> AgentRunResponse:
    entity = service.update_agent_run_status(agent_run_id=agent_run_id, payload=payload)
    if entity is None:
        raise HTTPException(status_code=404, detail=f"agent_run not found: {agent_run_id}")
    return AgentRunResponse.from_entity(entity)


@router.post("/runs/{agent_run_id}/execute", response_model=AgentRunExecuteResponse)
def execute_agent_run(
    agent_run_id: str,
    payload: AgentRunExecuteRequest,
    service: AgentApplicationService = Depends(get_agent_application_service),
) -> AgentRunExecuteResponse:
    entity = service.execute_agent_run(agent_run_id=agent_run_id, payload=payload)
    if entity is None:
        raise HTTPException(status_code=404, detail=f"agent_run not found: {agent_run_id}")

    output_json = entity.output_json or {}
    model_value = output_json.get("model")
    dry_run_value = output_json.get("dry_run")
    return AgentRunExecuteResponse(
        run=AgentRunResponse.from_entity(entity),
        model=model_value if isinstance(model_value, str) else None,
        dry_run=dry_run_value if isinstance(dry_run_value, bool) else False,
    )


@router.post("/workers/execute-next", response_model=AgentWorkerExecuteNextResponse)
def execute_next_worker_task(
    payload: AgentWorkerExecuteNextRequest,
    settings: AgentServiceSettings = Depends(get_agent_service_settings),
    service: AgentApplicationService = Depends(get_agent_application_service),
) -> AgentWorkerExecuteNextResponse:
    result = service.execute_next_claimed_agent_run(
        worker_key=payload.worker_key,
        lease_seconds=payload.lease_seconds or settings.worker_lease_seconds,
        dry_run=payload.dry_run if payload.dry_run is not None else settings.worker_dry_run,
    )
    if result is None:
        raise HTTPException(status_code=404, detail="queued agent_run not found")

    entity, released_lease_count = result
    output_json = entity.output_json or {}
    model_value = output_json.get("model")
    dry_run_value = output_json.get("dry_run")
    return AgentWorkerExecuteNextResponse(
        run=AgentRunResponse.from_entity(entity),
        model=model_value if isinstance(model_value, str) else None,
        dry_run=dry_run_value if isinstance(dry_run_value, bool) else False,
        released_lease_count=released_lease_count,
    )