from __future__ import annotations

import json

import httpx
from fastapi import HTTPException, Request
from fastapi.responses import JSONResponse

from vocero_api.api.responses import validated_json_response
from vocero_api.core import config as settings
from vocero_api.core import logging as app_logging
from vocero_api.models import requests as models_requests
from vocero_api.models.responses import ReasoningResponse
from vocero_api.providers import caller as providers_caller
from vocero_api.services import context as services_context
from vocero_api.services import mcp_reasoning


def _openai_headers() -> dict[str, str]:
    if not settings.OPENAI_API_KEY:
        raise RuntimeError("OPENAI_API_KEY is not configured.")
    headers = {
        "Authorization": f"Bearer {settings.OPENAI_API_KEY}",
        "Content-Type": "application/json",
    }
    if settings.OPENAI_ORGANIZATION:
        headers["OpenAI-Organization"] = settings.OPENAI_ORGANIZATION
    if settings.OPENAI_PROJECT:
        headers["OpenAI-Project"] = settings.OPENAI_PROJECT
    return headers


async def reasoning(req: models_requests.ReasoningRequest, request: Request) -> JSONResponse:
    if settings.S2S_REASONING_TYPE == "PROXY":
        raise HTTPException(status_code=409, detail="El servicio de razonamiento está deshabilitado en el modo PROXY.")
    if settings.S2S_MCP_URL:
        if not settings.OPENAI_API_KEY:
            raise HTTPException(503, "El servicio de razonamiento no está configurado.")
        return await mcp_reasoning.reply(req, request, _openai_headers())
    transcript = (req.transcript or "").strip()
    if not transcript:
        raise HTTPException(status_code=400, detail="Se requiere el campo transcript.")

    # ── S2S_INJECT_PROFILE: resolve podcast episode + caller profile + reports list + latest summary ──
    # (When S2S_INJECT_PROFILE=false this entire block is a no-op; user_context
    # and instructions are taken verbatim from the request body.)
    inject_episode_text = ""
    inject_profile_text = ""
    inject_reports_text = ""
    inject_summary_text = ""
    phone = (req.phoneNumber or "").strip()
    episode_id = (req.episode_id or "").strip()
    if not settings.S2S_INJECT_PROFILE:
        app_logging.logger.info(
            "[INJECT-PROFILE] ⏭️  REASONING: skipped (S2S_INJECT_PROFILE=false). "
            "Using verbatim request body; no fetch, no augmentation."
        )
    else:
        needs_phone_authed = bool(settings.VOCERO_USER_PHONE_AUTH_URL.strip())
        # 2026-09-11 user fix: remove mass injection of scheduled reports.
        #   treats S2S_REPORT_LIST as "need to fetch reports" ONLY when BOTH the URL is
        #   configured AND the new opt-in S2S_INJECT_REPORTS flag is true. When
        #   S2S_INJECT_REPORTS=false (default) needs_reports stays False here → we skip
        #   the branch entirely, no HTTP call, no context string, no prompt bloat.
        needs_reports = bool(settings.S2S_REPORT_LIST.strip()) and settings.S2S_INJECT_REPORTS
        needs_summary = bool(settings.S2S_LATEST_SUMMARY.strip()) or bool(settings.S2S_LATEST_SUMMARY_TEXT)
        needs_login = bool(settings.S2S_LOGIN_BY_PHONE.strip())
        can_inject = needs_phone_authed or needs_reports or needs_summary or needs_login or bool(episode_id)
        if (
            (not needs_phone_authed)
            and (not needs_reports)
            and (not needs_summary)
            and (not needs_login)
            and (not episode_id)
        ):
            app_logging.logger.info(
                "[INJECT-PROFILE] ⏭️  REASONING: skipped (VOCERO_USER_PHONE_AUTH_URL, S2S_REPORT_LIST, S2S_LATEST_SUMMARY/S2S_LATEST_SUMMARY_TEXT and S2S_LOGIN_BY_PHONE all empty, AND no episode_id in request; OR S2S_INJECT_REPORTS is false so reports injection is globally disabled). "
                "Set at least one AND set S2S_INJECT_REPORTS=true (if you want scheduled reports) to enable login / fetch episode/profile/reports/summary for REASONING endpoint."
            )
        elif (not phone) and (not needs_reports) and (not episode_id) and (not settings.S2S_LATEST_SUMMARY_TEXT):
            app_logging.logger.info(
                "[INJECT-PROFILE] ⏭️  REASONING: skipped (phoneNumber missing from request body AND no episode_id). "
                "Browser-side issue: check VoiceController passes phoneNumber and/or episode_id in the JSON body. (Note: S2S_REPORT_LIST fetch works even without phone.)"
            )
        elif not can_inject:
            app_logging.logger.info(
                "[INJECT-PROFILE] ⏭️  REASONING: skipped (env for phone empty and no reports/summary/login API and no episode_id)."
            )
        else:
            # ###################################################################
            # 0) Login-by-phone (optional — only if S2S_LOGIN_BY_PHONE env set)
            #    Obtains a bearer token that will be forwarded for profile/reports/summary fetches.
            # ###################################################################
            login_token = None
            if settings.S2S_LOGIN_BY_PHONE and phone:
                login_token, _login_resp = await providers_caller._login_by_phone(phone)
            # ###################################################################
            # 0.5) Podcast episode fetch (independent of phone — uses req.episode_id)
            # ###################################################################
            if episode_id:
                if settings.S2S_DEBUG_PROMPT:
                    app_logging.logger.info(
                        "[INJECT-EPISODE] starting REASONING fetch podcast episode episodeId=%.80s...",
                        episode_id,
                    )
                episode_raw = await providers_caller._fetch_podcast_episode(episode_id)
                inject_episode_text = services_context._resolve_episode_context(episode_raw)
                if inject_episode_text.strip():
                    app_logging.logger.info(
                        "[INJECT-EPISODE] ✅ REASONING: PODCAST EPISODE READY episodeId=%.80s wrappedLen=%d -> augmenting instructions + user_context before sending upstream.",
                        episode_id,
                        len(inject_episode_text),
                    )
                else:
                    app_logging.logger.info(
                        "[INJECT-EPISODE] ⏭️  REASONING: episode skipped (context empty / upstream returned empty / fetch failed)."
                    )
            # ###################################################################
            # 1) Profile fetch (optional — only if env is configured)
            # ###################################################################
            if needs_phone_authed and phone:
                profile_obj = await providers_caller._fetch_user_profile_for_phone(phone, auth_token=login_token)
                inject_profile_text = services_context._resolve_user_context_text(phone, profile_obj, loaded=True)
                if inject_profile_text.strip():
                    app_logging.logger.info(
                        "[INJECT-PROFILE] ✅ REASONING: profile READY phoneLen=%d contextLen=%d -> augmenting instructions + user_context before sending upstream.",
                        len(phone),
                        len(inject_profile_text),
                    )
                else:
                    app_logging.logger.info(
                        "[INJECT-PROFILE] ⏭️  REASONING: profile fetch OK but resolved context empty."
                    )
            # ###################################################################
            # 1.5) Scheduled reports / podcast scripts list (optional — S2S_REPORT_LIST)
            # ###################################################################
            if needs_reports:
                if settings.S2S_DEBUG_PROMPT:
                    app_logging.logger.info(
                        "[INJECT-REPORTS] starting REASONING fetch S2S_REPORT_LIST (phoneLen=%s, bearer=%s)...",
                        len(phone) if phone else "none",
                        "yes" if login_token else "no",
                    )
                reports_raw = await providers_caller._fetch_reports_list(
                    phone_number=phone if phone else None, auth_token=login_token
                )
                inject_reports_text = services_context._resolve_reports_context(reports_raw)
                if inject_reports_text.strip():
                    app_logging.logger.info(
                        "[INJECT-REPORTS] ✅ REASONING: reports list READY wrappedLen=%d -> augmenting instructions + user_context before sending upstream.",
                        len(inject_reports_text),
                    )
                else:
                    app_logging.logger.info(
                        "[INJECT-REPORTS] ⏭️  REASONING: reports list skipped (context empty / upstream returned empty list / fetch failed)."
                    )
            # ###################################################################
            # 2) Latest summary fetch (optional — only if env is configured)
            # ###################################################################
            if needs_summary and (phone or settings.S2S_LATEST_SUMMARY_TEXT):
                if settings.S2S_DEBUG_PROMPT:
                    app_logging.logger.info(
                        "[INJECT-SUMMARY] starting REASONING fetch (reasoning summary... S2S_LATEST_SUMMARY=%s S2S_LATEST_SUMMARY_TEXT=%s phoneLen=%s.",
                        bool(settings.S2S_LATEST_SUMMARY),
                        bool(settings.S2S_LATEST_SUMMARY_TEXT),
                        len(phone) if phone else "none",
                    )
                latest_summary_raw = await providers_caller._fetch_latest_summary_for_phone(
                    phone, auth_token=login_token
                )
                inject_summary_text = services_context._resolve_latest_summary_context(latest_summary_raw)
                if inject_summary_text.strip():
                    app_logging.logger.info(
                        "[INJECT-SUMMARY] ✅ REASONING: latest summary READY phoneLen=%s summaryTextOverride=%s wrappedLen=%d -> augmenting instructions + user_context before sending upstream.",
                        len(phone) if phone else "none",
                        bool(settings.S2S_LATEST_SUMMARY_TEXT),
                        len(inject_summary_text),
                    )
                else:
                    app_logging.logger.info(
                        "[INJECT-SUMMARY] ⏭️  REASONING: latest summary skipped (context empty / upstream returned empty summary / fetch failed.)"
                    )
    user_context_parts: list[str] = []
    # ─── USER FIX BUG 3: TODAY fixed context block → PREPEND to user_context too
    # (the same anti-hallucination block gets prefixed in the SYSTEM instructions
    # path via _augment_instructions_with_profile; we also prepend here so the
    # OPENAI/ANYSCALE messages[] array (where caller context is user_message[0])
    # ALSO gets the same guard.)
    # ─── USER FIX 2026-09-11 HALLUCINATION: voice_lock_block FIRST position
    voice_lock_block = services_context._build_voice_rules_head_lock_block(profile=profile_obj)
    if voice_lock_block.strip():
        user_context_parts.append(voice_lock_block)
    today_block = services_context._build_today_fixed_context_block()
    if today_block.strip():
        user_context_parts.append(today_block)
    if inject_episode_text:
        user_context_parts.append(inject_episode_text)
    if inject_profile_text:
        user_context_parts.append(inject_profile_text)
    if inject_reports_text:
        user_context_parts.append(inject_reports_text)
    if inject_summary_text:
        user_context_parts.append(inject_summary_text)
    original_user_context = (req.user_context or "").strip()
    if original_user_context:
        user_context_parts.append(original_user_context)
    user_context_parts = services_context._dedup_context_blocks_by_type(user_context_parts)
    if original_user_context:
        server_injected_types_in_client_ctx: set = set()
        for part in user_context_parts:
            if original_user_context and (part or "").strip() == original_user_context:
                continue
            tid = services_context._classify_context_block(part)
            if tid is None:
                continue
            for marker_tid, marker in services_context._CONTEXT_DEDUPE_MARKERS:
                if marker_tid == tid and marker and marker in original_user_context:
                    server_injected_types_in_client_ctx.add(tid)
                    break
        if server_injected_types_in_client_ctx:
            new_parts: list[str] = []
            for part in user_context_parts:
                if (part or "").strip() == original_user_context:
                    new_parts.append(part)
                    continue
                tid = services_context._classify_context_block(part)
                if tid in server_injected_types_in_client_ctx:
                    continue
                new_parts.append(part)
            if settings.S2S_DEBUG_PROMPT and new_parts != user_context_parts:
                app_logging.logger.info(
                    "[INJECT-DEDUPE] dropped server-injected profile/episode/reports/summary because the same block type was already present in req.user_context client-side context=%s kept=%d",
                    ", ".join(sorted(server_injected_types_in_client_ctx)),
                    len(new_parts),
                )
            user_context_parts = new_parts
    # ─── 2026-09-11 MARKER LEAK GUARD: strip invisible internal sentinels from EACH part.
    stripped_parts: list[str] = []
    for p in user_context_parts:
        sp = services_context._strip_internal_markers(p)
        if sp:
            stripped_parts.append(sp)
    user_context_parts = stripped_parts
    effective_user_context = "\n\n".join(user_context_parts)
    if settings.S2S_INJECT_PROFILE:
        any_injected = bool(inject_episode_text or inject_profile_text or inject_reports_text or inject_summary_text)
        if any_injected:
            app_logging.logger.info(
                "[INJECT-PROFILE] REASONING user_context final parts=%d serverEpisodeLen=%d serverProfileLen=%d serverReportsLen=%d serverSummaryLen=%d browserUserCtxLen=%d joinedLen=%d",
                len(user_context_parts),
                len(inject_episode_text),
                len(inject_profile_text),
                len(inject_reports_text),
                len(inject_summary_text),
                len(original_user_context),
                len(effective_user_context),
            )
        if settings.S2S_DEBUG_PROMPT and voice_lock_block.strip():
            app_logging.logger.info(
                "[DEBUG-VOICELOCK][REASONING augment] FULL voice lock block (len=%d):\n%s\n",
                len(voice_lock_block),
                services_context._strip_internal_markers(voice_lock_block),
            )
        if settings.S2S_DEBUG_PROMPT and inject_episode_text.strip():
            app_logging.logger.info(
                "[DEBUG-EPISODE][REASONING augment] FULL podcast episode block (len=%d):\n%s\n",
                len(inject_episode_text),
                services_context._strip_internal_markers(inject_episode_text),
            )
        if settings.S2S_DEBUG_PROMPT and today_block.strip():
            app_logging.logger.info(
                "[DEBUG-TODAY][REASONING augment] FULL today block (len=%d):\n%s\n",
                len(today_block),
                services_context._strip_internal_markers(today_block),
            )
        if settings.S2S_DEBUG_PROMPT and inject_reports_text.strip():
            app_logging.logger.info(
                "[DEBUG-REPORTS][REASONING augment] FULL reports list block (len=%d):\n%s\n",
                len(inject_reports_text),
                services_context._strip_internal_markers(inject_reports_text),
            )
        if settings.S2S_DEBUG_PROMPT and inject_summary_text.strip():
            app_logging.logger.info(
                "[DEBUG-SUMMARY][REASONING augment] FULL latest summary block (len=%d):\n%s\n",
                len(inject_summary_text),
                services_context._strip_internal_markers(inject_summary_text),
            )
        if settings.S2S_DEBUG_PROMPT and inject_profile_text.strip():
            app_logging.logger.info(
                "[DEBUG-PROFILE][REASONING augment] FULL profile block (len=%d):\n%s\n",
                len(inject_profile_text),
                services_context._strip_internal_markers(inject_profile_text),
            )
        effective_instructions = services_context._augment_instructions_with_profile(
            req.instructions or "",
            inject_profile_text,
            inject_reports_text,
            inject_summary_text,
            inject_episode_text,
            profile_obj=profile_obj,
        )
    else:
        effective_instructions = (req.instructions or "").strip()
    # Call the OpenAI-compatible Chat Completions provider.
    if not settings.OPENAI_API_KEY:
        raise HTTPException(status_code=503, detail="OPENAI_API_KEY no está configurado.")
    system_parts = []
    instructions = effective_instructions or ((req.instructions or "").strip())
    if instructions:
        system_parts.append(instructions)
    if effective_user_context.strip():
        system_parts.append(f"User context:\n{effective_user_context.strip()}")
    if req.language.strip():
        system_parts.append(
            "Reply only with the final assistant answer text. "
            f"Keep the answer natural and concise in this language: {req.language.strip()}."
        )
    else:
        system_parts.append("Reply only with the final assistant answer text. Keep the answer natural and concise.")
    app_logging.logger.info(
        "[INJECT-PROFILE] REASONING->OPENAI system message parts=%d instructionsLen=%d userCtxLen=%d phoneLen=%d episodeIdLen=%d",
        len(system_parts),
        len(effective_instructions),
        len(effective_user_context),
        len(phone),
        len(episode_id),
    )
    system_msg = "\n\n".join(system_parts)
    body = {
        "model": settings.OPENAI_REASONING_MODEL,
        "messages": [
            {"role": "system", "content": system_msg},
            {"role": "user", "content": transcript},
        ],
    }
    if settings.S2S_DEBUG_PROMPT:
        app_logging.logger.info(
            "[DEBUG-PROMPT][REASONING → OPENAI] FULL SYSTEM message (len=%d):\n%s\n",
            len(system_msg),
            system_msg,
        )
        app_logging.logger.info(
            "[DEBUG-PROMPT][REASONING → OPENAI] USER transcript (len=%d):\n%s\n",
            len(transcript),
            transcript,
        )
    app_logging.logger.debug(
        "[EXT][OPENAI] reasoning POST %s/chat/completions model=%s systemLen=%d transcriptLen=%d language=%s",
        settings.OPENAI_BASE_URL,
        settings.OPENAI_REASONING_MODEL,
        len(system_parts[0]) if system_parts else 0,
        len(transcript),
        (req.language or "")[:20] or "auto",
    )
    try:
        async with httpx.AsyncClient(timeout=30.0) as http:
            resp = await http.post(
                f"{settings.OPENAI_BASE_URL}/chat/completions",
                headers=_openai_headers(),
                json=body,
            )
    except httpx.RequestError as exc:
        app_logging.logger.warning("OpenAI reasoning unreachable: %r", exc)
        raise HTTPException(status_code=502, detail="No se puede conectar con el servicio de razonamiento de OpenAI.")  # noqa: B904
    app_logging.logger.debug(
        "[EXT][OPENAI] reasoning RESP status=%s len=%dB",
        resp.status_code,
        len(resp.content or b""),
    )
    if resp.status_code != 200:
        app_logging.logger.warning("OpenAI reasoning failed %s: %s", resp.status_code, resp.text[:400])
        raise HTTPException(status_code=502, detail=f"El razonamiento de OpenAI falló ({resp.status_code}).")
    try:
        payload = resp.json()
    except Exception:
        app_logging.logger.warning("OpenAI reasoning returned invalid JSON: %s", resp.text[:400])
        raise HTTPException(status_code=502, detail="El servicio de razonamiento de OpenAI devolvió un JSON no válido.")  # noqa: B904
    answer = ""
    choices = payload.get("choices")
    if isinstance(choices, list) and choices:
        message = choices[0].get("message") if isinstance(choices[0], dict) else None
        if isinstance(message, dict):
            content = message.get("content")
            if isinstance(content, str):
                answer = content.strip()
    usage = payload.get("usage")
    if isinstance(usage, dict):
        app_logging.logger.debug(
            "[EXT][OPENAI] reasoning USAGE prompt=%d completion=%d total=%d",
            usage.get("prompt_tokens", 0),
            usage.get("completion_tokens", 0),
            usage.get("total_tokens", 0),
        )
    if not answer:
        app_logging.logger.warning(
            "OpenAI reasoning returned empty answer: %s", json.dumps(payload, ensure_ascii=True)[:800]
        )
        raise HTTPException(status_code=502, detail="El servicio de razonamiento de OpenAI no devolvió una respuesta.")
    app_logging.logger.info("[Vocero REASONING] engine=OPENAI transcript=%s answer=%s", transcript[:300], answer[:500])
    return validated_json_response({"answer": answer}, ReasoningResponse)