"""
Flare – Prompt Builder (Refactored with Multi-language Support)
==============================================================
"""

from typing import List, Dict, Any
from datetime import datetime, timedelta
from config.config_provider import ConfigProvider
from utils.logger import log_info, log_error, log_warning, log_debug
from config.locale_manager import LocaleManager

# Date helper for locale-aware date expressions
def _get_date_context(locale_code: str = "tr") -> Dict[str, str]:
    """Generate date context for date expressions"""
    now = datetime.now()

    # Get locale data
    locale_data = LocaleManager.get_locale(locale_code)
    weekdays = locale_data.get("weekdays", ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"])

    today_weekday = weekdays[now.weekday()]

    # Calculate various dates
    dates = {
        "today": now.strftime("%Y-%m-%d"),
        "tomorrow": (now + timedelta(days=1)).strftime("%Y-%m-%d"),
        "day_after_tomorrow": (now + timedelta(days=2)).strftime("%Y-%m-%d"),
        "this_weekend_saturday": (now + timedelta(days=(5-now.weekday())%7)).strftime("%Y-%m-%d"),
        "this_weekend_sunday": (now + timedelta(days=(6-now.weekday())%7)).strftime("%Y-%m-%d"),
        "next_week_same_day": (now + timedelta(days=7)).strftime("%Y-%m-%d"),
        "two_weeks_later": (now + timedelta(days=14)).strftime("%Y-%m-%d"),
        "today_weekday": today_weekday,
        "today_day": now.day,
        "today_month": now.month,
        "today_year": now.year,
        "locale_code": locale_code
    }

    return dates

def _build_locale_aware_date_prompt(param, date_ctx: Dict, locale_data: Dict, locale_code: str) -> str:
    """Build locale-aware date extraction prompt"""

    # Get locale-specific date patterns
    date_patterns = locale_data.get("date_patterns", {})
    months = locale_data.get("months", [])

    prompt_parts = [f"• {param.name}: {param.extraction_prompt}"]
    prompt_parts.append(f"  IMPORTANT DATE RULES for {locale_data.get('name', 'this language')}:")

    # Add locale-specific patterns
    if locale_code == "tr":
        prompt_parts.extend([
            f"  - 'bugün' = {date_ctx['today']}",
            f"  - 'yarın' = {date_ctx['tomorrow']}",
            f"  - 'öbür gün' = {date_ctx['day_after_tomorrow']}",
            f"  - 'bu hafta sonu' = {date_ctx['this_weekend_saturday']} or {date_ctx['this_weekend_sunday']}",
            f"  - 'bu cumartesi' = {date_ctx['this_weekend_saturday']}",
            f"  - 'bu pazar' = {date_ctx['this_weekend_sunday']}",
            f"  - 'haftaya' or 'gelecek hafta' = add 7 days to current date",
            f"  - 'haftaya bugün' = {date_ctx['next_week_same_day']}",
            f"  - 'iki hafta sonra' = {date_ctx['two_weeks_later']}",
            f"  - '15 gün sonra' = add 15 days to today",
            f"  - '10 Temmuz' = {date_ctx['today_year']}-07-10",
            f"  - Turkish months: Ocak=01, Şubat=02, Mart=03, Nisan=04, Mayıs=05, Haziran=06, "
            f"Temmuz=07, Ağustos=08, Eylül=09, Ekim=10, Kasım=11, Aralık=12"
        ])
    elif locale_code == "en":
        prompt_parts.extend([
            f"  - 'today' = {date_ctx['today']}",
            f"  - 'tomorrow' = {date_ctx['tomorrow']}",
            f"  - 'day after tomorrow' = {date_ctx['day_after_tomorrow']}",
            f"  - 'this weekend' = {date_ctx['this_weekend_saturday']} or {date_ctx['this_weekend_sunday']}",
            f"  - 'this Saturday' = {date_ctx['this_weekend_saturday']}",
            f"  - 'this Sunday' = {date_ctx['this_weekend_sunday']}",
            f"  - 'next week' = add 7 days to current date",
            f"  - 'next {date_ctx['today_weekday']}' = {date_ctx['next_week_same_day']}",
            f"  - 'in two weeks' = {date_ctx['two_weeks_later']}",
            f"  - 'July 10' or '10th of July' = {date_ctx['today_year']}-07-10",
            f"  - English months: January=01, February=02, March=03, April=04, May=05, June=06, "
            f"July=07, August=08, September=09, October=10, November=11, December=12"
        ])

    # Add month mappings if available
    if months:
        month_mapping = [f"{month}={i+1:02d}" for i, month in enumerate(months)]
        prompt_parts.append(f"  - Month names: {', '.join(month_mapping)}")

    return "\n".join(prompt_parts)

# ─────────────────────────────────────────────────────────────────────────────
# INTENT PROMPT
# ─────────────────────────────────────────────────────────────────────────────
def build_intent_prompt(version: Any,  # VersionConfig
                       conversation: List[Dict[str, str]],
                       project_locale: str) -> str:
    """Build intent detection prompt with enhanced detection prompts and examples"""

    # Get config
    cfg = ConfigProvider.get()

    # Get internal prompt from LLM provider settings
    internal_prompt = ""
    if cfg.global_config.llm_provider and cfg.global_config.llm_provider.settings:
        internal_prompt = cfg.global_config.llm_provider.settings.get("internal_prompt", "")

    # Extract intent names and captions
    intent_names = [it.name for it in version.intents]
    intent_captions = [str(it.caption) if it.caption else it.name for it in version.intents]

    # Get project language name
    locale_data = LocaleManager.get_locale(project_locale)
    project_language = locale_data.get("name", "Turkish")
    current_language_name = project_language

    # Replace placeholders in internal prompt
    if internal_prompt:
        # Intent names - quoted and comma-separated
        intent_names_str = ', '.join([f'"{name}"' for name in intent_names])
        internal_prompt = internal_prompt.replace("<intent names>", intent_names_str)

        # Intent captions - quoted and comma-separated
        intent_captions_str = ', '.join([f'"{caption}"' for caption in intent_captions])
        internal_prompt = internal_prompt.replace("<intent captions>", intent_captions_str)

        # Project language
        internal_prompt = internal_prompt.replace("<project language>", project_language)
        internal_prompt = internal_prompt.replace("{{current_language_name}}", current_language_name)
        internal_prompt = internal_prompt.replace("{{project_language}}", project_language)

    # === ENHANCED INTENT INDEX WITH DETECTION PROMPTS AND EXAMPLES ===
    lines = ["### INTENT DETECTION RULES ###"]
    for it in version.intents:
        lines.append(f"\n{it.name}:")

        # Add detection prompt
        if it.detection_prompt:
            lines.append(f"  Detection Rule: {it.detection_prompt}")

        # Add examples to enhance detection
        examples = it.get_examples_for_locale(project_locale)
        if examples:
            # Combine detection prompt with examples
            examples_str = " | ".join([f'"{ex}"' for ex in examples[:5]])  # Max 5 examples
            lines.append(f"  Examples that match this intent: {examples_str}")

        # If we have both detection prompt and examples, make it clear
        if it.detection_prompt and examples:
            lines.append(f"  → This intent should be detected when user says something similar to the examples above AND matches the detection rule.")

    intent_index = "\n".join(lines)

    # === HISTORY ===
    history_block = "\n".join(
        f"{m['role'].upper()}: {m['content']}" for m in conversation[-10:]
    )

    # Combine prompts
    combined_prompt = internal_prompt + "\n\n" + version.general_prompt if internal_prompt else version.general_prompt

    # Get last user message
    user_input = conversation[-1]['content'] if conversation else ""

    prompt = (
        f"{combined_prompt}\n\n"
        f"{intent_index}\n\n"
        f"Conversation so far:\n{history_block}\n\n"
        f"USER: {user_input.strip()}"
    )

    log_info("✅ Intent prompt built with enhanced detection prompts and examples")
    return prompt

# ─────────────────────────────────────────────────────────────────────────────
# PARAMETER PROMPT
# ─────────────────────────────────────────────────────────────────────────────
_FMT = """#PARAMETERS:{"extracted":[{"name":"<param>","value":"<val>"},...],"missing":["<param>",...]}"""

def build_parameter_prompt(
    version: Any,  # VersionConfig
    intent_config: Any,  # IntentConfig
    chat_history: List[Dict[str, str]],
    collected_params: Dict[str, Any],
    missing_params: List[str],
    params_to_ask: List[str],
    max_params: int,
    project_locale: str,
    unanswered_params: List[str] = None
) -> str:
    """Build parameter collection prompt with approval support"""

    # Check if we're asking for approval parameter
    is_approval_question = len(params_to_ask) == 1 and params_to_ask[0] == "is_approved"

    if is_approval_question:
        # For approval, use special format without LLM collection prompt
        # This will be handled in chat_handler with custom approval_question
        return ""  # Return empty, chat_handler will use custom question

    # Normal parameter collection
    cfg = ConfigProvider.get()
    collection_config = cfg.global_config.llm_provider.settings.get("parameter_collection_config", {})
    collection_prompt = collection_config.get("collection_prompt", "")

    if not collection_prompt:
        # Fallback prompt
        collection_prompt = "Ask for the missing parameters naturally."

    # Build conversation history string
    history_str = "\n".join([
        f"{msg['role'].upper()}: {msg['content']}"
        for msg in chat_history[-5:]  # Last 5 messages
    ])

    # Build collected params string
    collected_str = "\n".join([
        f"- {k}: {v}" for k, v in collected_params.items()
    ])

    # Build missing params string with captions
    missing_str = []
    for param_name in missing_params:
        param = next((p for p in intent_config.parameters if p.name == param_name), None)
        if param:
            caption = param.get_caption_for_locale(project_locale) if hasattr(param, 'get_caption_for_locale') else param_name
            missing_str.append(f"- {param_name} ({caption})")
        else:
            missing_str.append(f"- {param_name}")
    missing_str = "\n".join(missing_str)

    # Build unanswered params string
    unanswered_str = "\n".join([f"- {p}" for p in (unanswered_params or [])])

    # Replace placeholders
    prompt = collection_prompt
    prompt = prompt.replace("{{conversation_history}}", history_str)
    prompt = prompt.replace("{{intent_name}}", intent_config.name)
    prompt = prompt.replace("{{intent_caption}}", str(intent_config.caption))
    prompt = prompt.replace("{{collected_params}}", collected_str)
    prompt = prompt.replace("{{missing_params}}", missing_str)
    prompt = prompt.replace("{{unanswered_params}}", unanswered_str)
    prompt = prompt.replace("{{max_params}}", str(max_params))
    prompt = prompt.replace("{{project_language}}", project_locale)
    prompt = prompt.replace("{{current_language_name}}", project_locale)  # For compatibility

    return prompt

# ─────────────────────────────────────────────────────────────────────────────
# SMART PARAMETER COLLECTION PROMPT
# ─────────────────────────────────────────────────────────────────────────────
def build_smart_parameter_question_prompt(intent_cfg,
                                        missing_params: List[str],
                                        conversation: List[Dict[str, str]],
                                        collection_config: Dict[str, Any],
                                        project_language: str) -> str:
    """Build prompt for smart parameter collection"""

    # Get the collection prompt template
    template = collection_config.get("collection_prompt", "Ask for the missing parameters.")

    # Replace placeholders
    prompt = template.replace("{{max_params}}", str(collection_config.get("max_params_per_question", 2)))
    prompt = prompt.replace("{{project_language}}", project_language)

    # Add parameter information
    param_info = []
    for param_name in missing_params[:collection_config.get("max_params_per_question", 2)]:
        param = next((p for p in intent_cfg.parameters if p.name == param_name), None)
        if param:
            # Get caption for default locale (first supported locale)
            caption = param.get_caption_for_locale("tr")  # Default to Turkish
            param_info.append(f"- {param_name}: {caption}")

    # Add context
    parts = [
        prompt,
        "",
        "Missing parameters:",
        "\n".join(param_info),
        "",
        "Recent conversation:"
    ]

    # Add recent conversation
    for msg in conversation[-5:]:
        parts.append(f"{msg['role'].upper()}: {msg['content']}")

    return "\n".join(parts)

# ─────────────────────────────────────────────────────────────────────────────
# PARAMETER EXTRACTION FROM QUESTION
# ─────────────────────────────────────────────────────────────────────────────
def extract_params_from_question(question: str, param_names: List[str]) -> Dict[str, str]:
    """Extract parameters that might be embedded in the question itself"""
    extracted = {}

    # Simple pattern matching for common cases
    # This is a basic implementation - can be enhanced with NLP

    # Example: "İstanbul'dan Ankara'ya ne zaman gitmek istiyorsunuz?"
    # Could extract origin=İstanbul, destination=Ankara

    # For now, return empty dict
    # This function can be enhanced based on specific use cases

    return extracted

# ─────────────────────────────────────────────────────────────────────────────
# API RESPONSE PROMPT
# ─────────────────────────────────────────────────────────────────────────────
def build_api_response_prompt(api_config, api_response: Dict) -> str:
    """Build prompt for API response with mappings"""

    response_prompt = api_config.response_prompt
    if not response_prompt:
        return "İşlem başarıyla tamamlandı."

    # Apply response mappings if available
    mapped_data = {}
    if hasattr(api_config, 'response_mappings'):
        for mapping in api_config.response_mappings:
            field_path = mapping.get('field_path', '')
            display_name = mapping.get('display_name', field_path)

            # Extract value from response
            value = _extract_value_from_path(api_response, field_path)
            if value is not None:
                mapped_data[display_name] = value

    # Replace placeholders in response prompt
    for key, value in mapped_data.items():
        response_prompt = response_prompt.replace(f"{{{key}}}", str(value))

    # Also try direct field replacement
    for key, value in api_response.items():
        response_prompt = response_prompt.replace(f"{{{key}}}", str(value))

    return response_prompt

def _extract_value_from_path(data: Dict, path: str) -> Any:
    """Extract value from nested dict using dot notation"""
    try:
        parts = path.split('.')
        value = data
        for part in parts:
            if isinstance(value, dict):
                value = value.get(part)
            elif isinstance(value, list) and part.isdigit():
                value = value[int(part)]
            else:
                return None
        return value
    except:
        return None