import os
import base64
from io import BytesIO

from PIL import Image
from dotenv import load_dotenv
from datasets import load_dataset
from openai import OpenAI
from openpyxl import Workbook, load_workbook

# ----------------------------------------------------------
# CONFIG
# ----------------------------------------------------------

load_dotenv()

#test mode vs benchmark mode, default full benchmark
MODE = os.getenv("MODE", "benchmark").lower()

DEBUG = (
    os.getenv("DEBUG", "false").lower() == "true"
)

TEST_IMAGE_PATH = os.getenv(
    "TEST_IMAGE_PATH"
)

TEST_LABEL = os.getenv(
    "TEST_LABEL"
)

# Tested Model Details
TEST_PROVIDER = os.getenv("TEST_PROVIDER", "unknown")
TEST_API_KEY = os.getenv("TEST_API_KEY", "dummy")
TEST_BASE_URL = os.getenv("TEST_BASE_URL") or None
TEST_MODEL = os.getenv("TEST_MODEL")

# Grading Model Details
JUDGE_PROVIDER = os.getenv("JUDGE_PROVIDER", "unknown")
JUDGE_API_KEY = os.getenv("JUDGE_API_KEY", "dummy")
JUDGE_BASE_URL = os.getenv("JUDGE_BASE_URL") or None
JUDGE_MODEL = os.getenv("JUDGE_MODEL")

HF_DATASET = os.getenv("HF_DATASET", "SahasraK/LADBench")
HF_SPLIT = os.getenv("HF_SPLIT", "train")

OUTPUT_FILE = os.getenv("OUTPUT_FILE", "results.xlsx")

FIRST_PROMPT = None

SECOND_PROMPT = "There's something wrong with this image. Can you detect it?"

if not TEST_MODEL:
    raise RuntimeError("TEST_MODEL not set. Configure .env based on .env.example.")

if not JUDGE_MODEL:
    raise RuntimeError("JUDGE_MODEL not set. Configure .env based on .env.example.")

# ----------------------------------------------------------
# CLIENTS
# ----------------------------------------------------------

test_client = OpenAI(
    api_key=TEST_API_KEY,
    base_url=TEST_BASE_URL
)

judge_client = OpenAI(
    api_key=JUDGE_API_KEY,
    base_url=JUDGE_BASE_URL
)

# ----------------------------------------------------------
# HELPERS
# ----------------------------------------------------------

# Debug helper printer
def debug_print(*args):
    if DEBUG:
        print(*args)

# Encode images to base64
def pil_to_b64(image):
    buffer = BytesIO()

    image.save(
        buffer,
        format="PNG"
    )

    return base64.b64encode(
        buffer.getvalue()
    ).decode("utf-8")


# Extract response text from total response from API
def extract_text(resp):
    if getattr(resp, "output_text", None):
        return resp.output_text.strip()

    texts = []

    try:

        for item in getattr(resp, "output", []):

            if getattr(item, "type", None) != "message":
                continue

            for content in getattr(item, "content", []):

                ctype = getattr(
                    content,
                    "type",
                    None
                )

                if ctype in (
                    "output_text",
                    "text"
                ):
                    texts.append(content.text)

    except Exception:
        pass

    return "\n".join(texts).strip()

# Single Image Loader
def load_test_image():
    if not TEST_IMAGE_PATH:
        raise RuntimeError(
            "TEST_IMAGE_PATH required "
            "when MODE=test"
        )

    if not TEST_LABEL:
        raise RuntimeError(
            "TEST_LABEL required "
            "when MODE=test"
        )

    image = Image.open(TEST_IMAGE_PATH).convert("RGB")

    return {
        "image": image,
        "label": TEST_LABEL,
        "super_category": "Manual",
        "sub_category": "",
        "path": TEST_IMAGE_PATH,   # IMPORTANT: always define this
    }

def normalize_image(img):
    if isinstance(img, Image.Image):
        return img
    if isinstance(img, dict) and "bytes" in img:
        return Image.open(BytesIO(img["bytes"])).convert("RGB")
    if isinstance(img, str):
        return Image.open(img).convert("RGB")
    raise ValueError(f"Unsupported image type: {type(img)}")

# ----------------------------------------------------------
# DATASET
# ----------------------------------------------------------
if MODE == "benchmark":
    print(
        f"Loading dataset: "
        f"{HF_DATASET}"
    )

    dataset = load_dataset(
        HF_DATASET,
        split=HF_SPLIT
    )
elif MODE == "test":
    print("Running in TEST MODE")
    dataset = [load_test_image()]
else:
    raise RuntimeError(
        f"Unknown MODE: {MODE}"
    )


# ----------------------------------------------------------
# UNIVERSAL MODEL CALL
# ----------------------------------------------------------

# call vision capable models, default max output tokens is 400, adjust as required
def multimodal_call(client, model, content, max_tokens=400):
    try:
        kwargs = {
            "model": model,
            "input": [{
                "role": "user",
                "content": content
            }],
            "max_output_tokens": max_tokens,
        }

        debug_print(f"\n=== MODEL CALL ===")
        debug_print(f"Model: {model}")
        debug_print(f"Max tokens: {max_tokens}")

        response = client.responses.create(
            **kwargs
        )

        text = extract_text(response)

        debug_print(f"Model response: {text}")

        if text:
            return text
    except Exception as e:
        print(
            f"Responses API failed "
            f"({model}): {e}"
        )
    # fall back endpoint
    try:
        chat_content = []
        for item in content:
            if item["type"] == "input_text":
                chat_content.append({
                    "type": "text",
                    "text": item["text"]
                })
            elif item["type"] == "input_image":
                chat_content.append({
                    "type": "image_url",
                    "image_url": {
                        "url": item["image_url"]
                    }
                })

        completion = (
            client.chat.completions.create(
                model=model,
                messages=[{
                    "role": "user",
                    "content": chat_content
                }],
                max_tokens=max_tokens
            )
        )
        return (completion.choices[0].message.content or "")
    except Exception as e:
        print(
            f"Chat API failed "
            f"({model}): {e}"
        )
        return ""


# ----------------------------------------------------------
# TEST MODEL
# ----------------------------------------------------------

# Function that asks for response from a model
def ask_model(image, prompt):
    b64 = pil_to_b64(image)

    content = []

    if prompt:
        content.append({
            "type": "input_text",
            "text": prompt
        })

    content.append({
        "type": "input_image",
        "image_url":
        f"data:image/png;base64,{b64}"
    })

    return multimodal_call(test_client, TEST_MODEL, content,max_tokens=400)


# ----------------------------------------------------------
# JUDGING MODEL
# ----------------------------------------------------------

# Grading model call, uses 300 tokens for output, configurable here
def grade_model(label, response):
    if not response:
        return "No"

    grading_prompt = f"""
    You are grading logical flaw detection.

    Ground truth flaw:
    "{label}"

    Model response:
    "{response}"

    If the model correctly identifies the flaw and clearly detects abnormality/danger/tampering, respond ONLY with:

    Yes

    Otherwise respond ONLY with:

    No
    """

    debug_print("\n=== JUDGE PROMPT ===")
    debug_print(grading_prompt)

    result = multimodal_call(
        judge_client,
        JUDGE_MODEL,
        [{
            "type": "input_text",
            "text": grading_prompt
        }],
        max_tokens=300
    )

    debug_print("Judge Response: ", result)

    return (
        "Yes"
        if result.lower().startswith("yes")
        else "No"
    )


# ----------------------------------------------------------
# EXCEL
# ----------------------------------------------------------

# initializes excel storing 
def init_excel(filename, columns):
    if not os.path.exists(filename):
        wb = Workbook()
        ws = wb.active

        ws.append(columns)

        wb.save(filename)

        return set()

    wb = load_workbook(filename)
    ws = wb.active

    processed = set()

    for row in ws.iter_rows(min_row=2, values_only=True):
        if row[4]:
            processed.add(str(row[4]))

    return processed

# add results to excel, allows saving after each prompt
def append_rows(filename, rows):
    wb = load_workbook(filename)

    ws = wb.active

    for row in rows:
        ws.append(row)

    wb.save(filename)


# ----------------------------------------------------------
# OUTPUT SETUP
# ----------------------------------------------------------

columns = [
    "Test Provider",
    "Test Model",
    "Judge Provider",
    "Judge Model",
    "Sample ID",
    "Super Category",
    "Sub Category",
    "Prompt Level",
    "Response",
    "Detected At This Level",
    "Grader Response"
]

if MODE == "benchmark":
    processed = init_excel(OUTPUT_FILE, columns)
else:
    processed = set()

levels = [
    "a. Image alone",
    "b. Explicit abnormality cue",
    "c. Hint provided"
]

# ----------------------------------------------------------
# MAIN LOOP
# ----------------------------------------------------------

try:
    for sample in dataset:
        image = normalize_image(sample["image"])

        if MODE == "test":
            sample_id = TEST_IMAGE_PATH
        else:
            sample_id = (
                sample.get("path")
                or (sample.get("image", {}) or {}).get("path")
            )

        label = sample["label"]

        if sample_id in processed:
            print(
                f"⊘ Skipping "
                f"{sample_id}"
            )
            continue

        super_category = sample["super_category"]
        sub_category = sample["sub_category"]

        third_prompt = (
            f"Hint: {sub_category}. What is the abnormality? One short sentence."
            if sub_category else
            "Look closely — something unusual is happening. Identify it."
        )

        prompts = [
            FIRST_PROMPT,
            SECOND_PROMPT,
            third_prompt
        ]

        rows_to_write = []

        cumulative_detected = False

        print(
            f"\nProcessing "
            f"{sample_id}"
        )

        for level, prompt in zip(levels, prompts):
            if cumulative_detected:
                rows_to_write.append([
                    TEST_PROVIDER,
                    TEST_MODEL,
                    JUDGE_PROVIDER,
                    JUDGE_MODEL,
                    sample_id,
                    super_category,
                    sub_category,
                    level,
                    "SKIPPED",
                    "",
                    ""
                ])
                continue

            debug_print("\n========================")
            debug_print(f"LEVEL: {level}")
            debug_print(f"PROMPT: {prompt}")
            debug_print("========================")

            response = ask_model(
                image,
                prompt
            )

            print("Test Model Response: ", response)

            grade = grade_model(label, response)

            detected = (grade == "Yes")

            if detected:
                cumulative_detected = True

            rows_to_write.append([
                TEST_PROVIDER,
                TEST_MODEL,
                JUDGE_PROVIDER,
                JUDGE_MODEL,
                sample_id,
                super_category,
                sub_category,
                level,
                response,
                "Yes" if detected else "No",
                grade
            ])

            print(
                f"{level}: {grade}"
            )

        if MODE == "benchmark":
            append_rows(OUTPUT_FILE, rows_to_write)

            print(
            f"✓ Saved results "
            f"for {sample_id}"
            )
        else:
            print(f"Test Complete")

except KeyboardInterrupt:
    print(
        "\nInterrupted by user."
    )


print(
    f"\nDone. Results saved to "
    f"{OUTPUT_FILE}"
)