# backend/fixed_output.py

import os
import warnings
import json


BASE = os.path.dirname(os.path.abspath(__file__))

def parse_fixed_md(content: str):
    lines = [line.strip() for line in content.split("\n") if line.strip()]

    result = {
        "type": None,
        "trigger": None,
        "steps": [],
        "options": [],
        "text": None
    }

    # -------------------------
    # TYPE
    # -------------------------
    if lines[0].startswith("TYPE:"):
        result["type"] = lines[0].split(":", 1)[1].strip()
        lines = lines[1:]

    # -------------------------
    # TRIGGER
    # -------------------------
    if lines and lines[0].startswith("TRIGGER:"):
        result["trigger"] = [
            t.strip() for t in lines[0].split(":", 1)[1].split(",")
        ]
        lines = lines[1:]

    skill_type = result["type"]

    # -------------------------
    # multi-step-options（多步驟）
    # -------------------------
    if skill_type == "multi-step-options":
        steps = []
        current_step = None

        i = 0
        while i < len(lines):
            line = lines[i]

            if line == "[STEP]":
                if current_step:
                    steps.append(current_step)

                i += 1
                label = lines[i] if i < len(lines) else ""
                current_step = {"label": label, "options": []}

            elif line.startswith("-") and current_step:
                option = line.lstrip("-").strip()
                current_step["options"].append(option)

            i += 1

        if current_step:
            steps.append(current_step)

        result["steps"] = steps
        warnings.warn(json.dumps(result, ensure_ascii=False, indent=2))
        return result

    # -------------------------
    # multi-options（單步驟多選）
    # -------------------------
    if skill_type == "multi-options":
        result["options"] = [
            line.lstrip("-").strip()
            for line in lines if line.startswith("-")
        ]
        return result

    # -------------------------
    # fixed-sequence（固定句子）
    # -------------------------
    if skill_type == "fixed-sequence":
        steps = []
    
        for line in lines:
    
            if line.startswith("[STEP]"):
                label = line.replace("[STEP]", "").strip()
                steps.append({
                    "label": label,
                    "options": [label]
                })
                continue
                
            if line.startswith("-"):
                text = line.lstrip("-").strip()
                steps.append({
                    "label": text,
                    "options": [text]
                })
                continue
    
        result["steps"] = steps
        return result


    # -------------------------
    # fallback
    # -------------------------
    result["raw"] = content
    return result


def run_fixed_output(field_name: str):
    path = os.path.join(BASE, "skills", f"{field_name}_fixed", f"{field_name}.md")

    if not os.path.exists(path):
        return f"[Error] 找不到固定輸出：{path}"

    with open(path, "r", encoding="utf-8") as f:
        content = f.read().strip()

    return parse_fixed_md(content)