"""
Flare – Prompt Builder  (v6 · date handling)
==============================================================
"""

from typing import List, Dict
from datetime import datetime, timedelta
from utils import log


# Date helper for Turkish date expressions
def _get_date_context() -> Dict[str, str]:
    """Generate date context for Turkish date expressions"""
    now = datetime.now()
    
    # Weekday names in Turkish
    weekdays_tr = ["Pazartesi", "Salı", "Çarşamba", "Perşembe", "Cuma", "Cumartesi", "Pazar"]
    today_weekday = weekdays_tr[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
    }
    
    return dates


# ─────────────────────────────────────────────────────────────────────────────
# INTENT PROMPT
# ─────────────────────────────────────────────────────────────────────────────
def build_intent_prompt(general_prompt: str,
                        conversation: List[Dict[str, str]],
                        user_input: str,
                        intents: List) -> str:
    # === INTENT INDEX ===
    lines = ["### INTENT INDEX ###"]
    for it in intents:
        # IntentConfig object attribute access
        det = it.detection_prompt.strip() if it.detection_prompt else ""
        det_part = f'  • detection_prompt → "{det}"' if det else ""
        exs = " | ".join(it.examples) if it.examples else ""
        ex_part = f"  • examples → {exs}" if exs else ""

        newline_between = "\n" if det_part and ex_part else ""
        lines.append(f"{it.name}:{det_part}{newline_between}{ex_part}")

    intent_index = "\n".join(lines)

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

    prompt = (
        f"{general_prompt}\n\n"
        f"{intent_index}\n\n"
        f"Conversation so far:\n{history_block}\n\n"
        f"USER: {user_input.strip()}"
    )
    log("✅ Intent prompt built (index with detection_prompt)")
    return prompt


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

def build_parameter_prompt(intent_cfg,
                           missing_params: List[str],
                           user_input: str,
                           conversation: List[Dict[str, str]]) -> str:
    
    date_ctx = _get_date_context()
    
    parts: List[str] = [
        "You are extracting parameters from user messages in TURKISH.",
        f"Today is {date_ctx['today']} ({date_ctx['today_weekday']}). Tomorrow is {date_ctx['tomorrow']}.",
        "Extract ONLY the parameters listed below from the conversation.",
        "Look at BOTH the current message AND previous messages to find parameter values.",
        "If a parameter cannot be found, is invalid, or wasn't provided, keep it in the \"missing\" list.",
        "Never guess or make up values. Only extract values explicitly given by the user.",
        ""
    ]
    
    # Add parameter descriptions
    parts.append("Parameters to extract:")
    for p in intent_cfg.parameters:
        if p.name in missing_params:
            # Special handling for date type parameters
            if p.type == "date":
                date_prompt = (
                    f"• {p.name}: {p.extraction_prompt}\n"
                    f"  IMPORTANT DATE RULES:\n"
                    f"  - 'bugün' = {date_ctx['today']}\n"
                    f"  - 'yarın' = {date_ctx['tomorrow']}\n"
                    f"  - 'öbür gün' = {date_ctx['day_after_tomorrow']}\n"
                    f"  - 'bu hafta sonu' = {date_ctx['this_weekend_saturday']} or {date_ctx['this_weekend_sunday']}\n"
                    f"  - 'bu cumartesi' = {date_ctx['this_weekend_saturday']}\n"
                    f"  - 'bu pazar' = {date_ctx['this_weekend_sunday']}\n"
                    f"  - 'haftaya' or 'gelecek hafta' = add 7 days to current date\n"
                    f"  - 'haftaya bugün' = {date_ctx['next_week_same_day']}\n"
                    f"  - 'iki hafta sonra' = {date_ctx['two_weeks_later']}\n"
                    f"  - '15 gün sonra' = add 15 days to today\n"
                    f"  - '10 Temmuz' = {date_ctx['today_year']}-07-10\n"
                    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"
                )
                parts.append(date_prompt)
            else:
                parts.append(f"• {p.name}: {p.extraction_prompt}")
    
    # Add format instruction
    parts.append("")
    parts.append("IMPORTANT: Your response must start with '#PARAMETERS:' followed by the JSON.")
    parts.append("Return ONLY this format with no extra text before or after:")
    parts.append(_FMT)
    
    # Add conversation history
    history_block = "\n".join(
        f"{m['role'].upper()}: {m['content']}" for m in conversation[-10:]
    )
    
    prompt = (
        "\n".join(parts) + 
        "\n\nConversation so far:\n" + history_block +
        "\n\nUSER: " + user_input.strip()
    )
    
    log(f"📝 Parameter prompt built for missing: {missing_params}")
    return prompt