"""
AI command API — processes natural language commands against a sheet.
"""

import json
import logging
import os
import re
import aiohttp
from datetime import date

from quart import Blueprint, jsonify, request

from ..auth.middleware import auth_required, get_user_id
from ..sheets.manager import load_sheet_data, update_sheet, generate_next_id, get_sheet_client_id
from ..api.dropdowns import _load_dropdowns
from ..config_runtime import server_config

logger = logging.getLogger(__name__)

ai_bp = Blueprint('ai', __name__, url_prefix='/api/sheets')

SPEECH_CORRECTIONS = {
    'delivery balls': 'deliverables',
    'delivery ball': 'deliverable',
    'delivery': 'deliverables',
    'liver': 'deliverables',
    'rose': 'rows',
    'oh oh h': 'OOH',
    'out of home': 'OOH',
}

NUMBER_WORDS = {
    'one': '1', 'two': '2', 'three': '3', 'four': '4', 'five': '5',
    'six': '6', 'seven': '7', 'eight': '8', 'nine': '9', 'ten': '10',
    'eleven': '11', 'twelve': '12', 'twenty': '20', 'thirty': '30',
}

_PROMPT_PATH = os.path.join(os.path.dirname(os.path.dirname(os.path.dirname(__file__))), 'prompts', 'ac_command.txt')


def _load_prompt_template() -> str:
    try:
        with open(_PROMPT_PATH, 'r') as f:
            return f.read()
    except Exception:
        return ""


def _preprocess(command: str) -> str:
    cmd = command.lower()
    for wrong, right in SPEECH_CORRECTIONS.items():
        cmd = cmd.replace(wrong, right)
    for word, digit in NUMBER_WORDS.items():
        cmd = re.sub(r'\b' + word + r'\b', digit, cmd)
    return cmd


async def _build_hierarchy_rules(client_id: str = None) -> str:
    categories = await _load_dropdowns(client_id)
    lines = []
    for cat in categories:
        if cat.get('status') != 'Active':
            continue
        media_str = ', '.join(cat.get('mediaTypes', []))
        lines.append(f"- {cat['name']}: {media_str}")
    return '\n'.join(lines)


async def _call_gemini(prompt: str) -> dict:
    api_key = server_config.GEMINI_API_KEY
    model = server_config.GEMINI_MODEL
    url = f"https://generativelanguage.googleapis.com/v1beta/models/{model}:generateContent?key={api_key}"

    payload = {"contents": [{"parts": [{"text": prompt}]}]}

    async with aiohttp.ClientSession() as session:
        async with session.post(url, json=payload) as resp:
            return await resp.json()


def _extract_json(text: str) -> dict:
    start = text.find('{')
    end = text.rfind('}')
    if start == -1 or end == -1:
        raise ValueError("No JSON object found in response")
    return json.loads(text[start:end + 1])


@ai_bp.route('/<sheet_id>/command', methods=['POST'])
@auth_required
async def run_command(sheet_id: str):
    user_id = get_user_id()

    body = await request.get_json() or {}
    raw_command = body.get('command', '').strip()
    yolo_mode = bool(body.get('yolo_mode', False))
    history = body.get('history', '')

    if not raw_command:
        return jsonify({'error': 'empty_command'}), 400

    data = await load_sheet_data(user_id, sheet_id)
    if data is None:
        return jsonify({'error': 'sheet_not_found'}), 404

    command = _preprocess(raw_command)
    template = _load_prompt_template()
    client_id = await get_sheet_client_id(user_id, sheet_id)
    hierarchy = await _build_hierarchy_rules(client_id)

    prompt = template.format(
        current_date=date.today().isoformat(),
        yolo_mode='TRUE' if yolo_mode else 'FALSE',
        conversation_history=history or '(none)',
        data_context=json.dumps(data),
        hierarchy_rules=hierarchy,
        command=command,
    )

    try:
        gemini_resp = await _call_gemini(prompt)
    except Exception as e:
        logger.error(f"Gemini API error: {e}")
        return jsonify({'error': 'ai_error', 'message': str(e)}), 502

    if 'error' in gemini_resp:
        msg = gemini_resp['error'].get('message', 'Unknown error')
        return jsonify({'error': 'gemini_error', 'message': msg}), 502

    llm_text = (
        gemini_resp.get('candidates', [{}])[0]
        .get('content', {})
        .get('parts', [{}])[0]
        .get('text', '')
    )

    if not llm_text:
        return jsonify({'error': 'empty_ai_response'}), 502

    try:
        action = _extract_json(llm_text)
    except Exception:
        return jsonify({'error': 'invalid_ai_json', 'debug_llm': llm_text}), 502

    operation = action.get('operation')

    if operation == 'create':
        items = action.get('items', [])
        for item in items:
            item['Number'] = generate_next_id(data)
            item.setdefault('Status', 'Booked')
            item.setdefault('Quantity', 1)
            data.append(item)
        await update_sheet(user_id, sheet_id, data)
        return jsonify({'success': True, 'operation': 'create', 'count': len(items), 'data': data})

    elif operation == 'update':
        values = action.get('values', {})
        target_ids = action.get('target_ids', [])
        count = 0
        for row in data:
            if not target_ids or row.get('Number') in target_ids:
                row.update(values)
                count += 1
        await update_sheet(user_id, sheet_id, data)
        return jsonify({'success': True, 'operation': 'update', 'count': count, 'data': data})

    elif operation == 'batch_update':
        updates = action.get('updates', [])
        count = 0
        for upd in updates:
            num = upd.get('Number')
            vals = upd.get('values', {})
            for row in data:
                if row.get('Number') == num:
                    row.update(vals)
                    count += 1
                    break
        await update_sheet(user_id, sheet_id, data)
        return jsonify({'success': True, 'operation': 'batch_update', 'count': count, 'data': data})

    elif operation == 'question':
        return jsonify({'success': True, 'operation': 'question', 'question': action.get('text', '')})

    return jsonify({'error': 'unknown_operation', 'operation': operation}), 400