import json
import logging
import os
import platform
import re
import subprocess
import sys
import tempfile
import threading
import time
import zipfile
from io import BytesIO
from os import PathLike
from pathlib import Path
from queue import Empty, Queue
from typing import Any, Callable, Optional, Union

import numpy as np
import pdfplumber
import requests
from PIL import Image
from strenum import StrEnum

from .pdf_parser import RAGPdfParser

LOCK_KEY_pdfplumber = "global_shared_lock_pdfplumber"
if LOCK_KEY_pdfplumber not in sys.modules:
    sys.modules[LOCK_KEY_pdfplumber] = threading.Lock()


class MinerUContentType(StrEnum):
    IMAGE = "image"
    TABLE = "table"
    TEXT = "text"
    EQUATION = "equation"
    CODE = "code"
    LIST = "list"
    DISCARDED = "discarded"


class MinerUParser(RAGPdfParser):
    def __init__(self, mineru_path: str = "mineru", mineru_api: str = "http://host.docker.internal:9987", mineru_server_url: str = ""):
        self.mineru_path = Path(mineru_path)
        self.mineru_api = mineru_api.rstrip("/")
        self.mineru_server_url = mineru_server_url.rstrip("/")
        self.using_api = False
        self.logger = logging.getLogger(self.__class__.__name__)

    def _extract_zip_no_root(self, zip_path, extract_to, root_dir):
        with zipfile.ZipFile(zip_path, "r") as zip_ref:
            if not root_dir:
                files = zip_ref.namelist()
                if files and files[0].endswith("/"):
                    root_dir = files[0]
                else:
                    root_dir = None

            if not root_dir or not root_dir.endswith("/"):
                self.logger.info(f"[MinerU] No root directory found, extracting all...fff{root_dir}")
                zip_ref.extractall(extract_to)
                return

            root_len = len(root_dir)
            for member in zip_ref.infolist():
                filename = member.filename
                if filename == root_dir:
                    self.logger.info("[MinerU] Ignore root folder...")
                    continue

                path = filename
                if path.startswith(root_dir):
                    path = path[root_len:]

                full_path = os.path.join(extract_to, path)
                if member.is_dir():
                    os.makedirs(full_path, exist_ok=True)
                else:
                    os.makedirs(os.path.dirname(full_path), exist_ok=True)
                    with open(full_path, "wb") as f:
                        f.write(zip_ref.read(filename))

    def _is_http_endpoint_valid(self, url, timeout=5):
        try:
            response = requests.head(url, timeout=timeout, allow_redirects=True)
            return response.status_code in [200, 301, 302, 307, 308]
        except Exception:
            return False

    def check_installation(self, backend: str = "pipeline", server_url: Optional[str] = None) -> tuple[bool, str]:
        reason = ""

        valid_backends = ["pipeline", "vlm-http-client", "vlm-transformers", "vlm-vllm-engine"]
        if backend not in valid_backends:
            reason = "[MinerU] Invalid backend '{backend}'. Valid backends are: {valid_backends}"
            logging.warning(reason)
            return False, reason

        subprocess_kwargs = {
            "capture_output": True,
            "text": True,
            "check": True,
            "encoding": "utf-8",
            "errors": "ignore",
        }

        if platform.system() == "Windows":
            subprocess_kwargs["creationflags"] = getattr(subprocess, "CREATE_NO_WINDOW", 0)

        if server_url is None:
            server_url = self.mineru_server_url

        if backend == "vlm-http-client" and server_url:
            try:
                server_accessible = self._is_http_endpoint_valid(server_url + "/openapi.json")
                logging.info(f"[MinerU] vlm-http-client server check: {server_accessible}")
                if server_accessible:
                    self.using_api = False  # We are using http client, not API
                    return True, reason
                else:
                    reason = f"[MinerU] vlm-http-client server not accessible: {server_url}"
                    logging.warning(f"[MinerU] vlm-http-client server not accessible: {server_url}")
                    return False, reason
            except Exception as e:
                logging.warning(f"[MinerU] vlm-http-client server check failed: {e}")
                try:
                    response = requests.get(server_url, timeout=5)
                    logging.info(f"[MinerU] vlm-http-client server connection check: success with status {response.status_code}")
                    self.using_api = False
                    return True, reason
                except Exception as e:
                    reason = f"[MinerU] vlm-http-client server connection check failed: {server_url}: {e}"
                    logging.warning(f"[MinerU] vlm-http-client server connection check failed: {server_url}: {e}")
                    return False, reason

        try:
            result = subprocess.run([str(self.mineru_path), "--version"], **subprocess_kwargs)
            version_info = result.stdout.strip()
            if version_info:
                logging.info(f"[MinerU] Detected version: {version_info}")
            else:
                logging.info("[MinerU] Detected MinerU, but version info is empty.")
            return True, reason
        except subprocess.CalledProcessError as e:
            logging.warning(f"[MinerU] Execution failed (exit code {e.returncode}).")
        except FileNotFoundError:
            logging.warning("[MinerU] MinerU not found. Please install it via: pip install -U 'mineru[core]'")
        except Exception as e:
            logging.error(f"[MinerU] Unexpected error during installation check: {e}")

        # If executable check fails, try API check
        try:
            if self.mineru_api:
                # check openapi.json
                openapi_exists = self._is_http_endpoint_valid(self.mineru_api + "/openapi.json")
                if not openapi_exists:
                    reason = "[MinerU] Failed to detect vaild MinerU API server"
                    return openapi_exists, reason
                logging.info(f"[MinerU] Detected {self.mineru_api}/openapi.json: {openapi_exists}")
                self.using_api = openapi_exists
                return openapi_exists, reason
            else:
                logging.info("[MinerU] api not exists.")
        except Exception as e:
            reason = f"[MinerU] Unexpected error during api check: {e}"
            logging.error(f"[MinerU] Unexpected error during api check: {e}")
        return False, reason

    def _run_mineru(
        self, input_path: Path, output_dir: Path, method: str = "auto", backend: str = "pipeline", lang: Optional[str] = None, server_url: Optional[str] = None, callback: Optional[Callable] = None
    ):
        if self.using_api:
            self._run_mineru_api(input_path, output_dir, method, backend, lang, callback)
        else:
            self._run_mineru_executable(input_path, output_dir, method, backend, lang, server_url, callback)

    def _run_mineru_api(self, input_path: Path, output_dir: Path, method: str = "auto", backend: str = "pipeline", lang: Optional[str] = None, callback: Optional[Callable] = None):
        OUTPUT_ZIP_PATH = os.path.join(str(output_dir), "output.zip")

        pdf_file_path = str(input_path)

        if not os.path.exists(pdf_file_path):
            raise RuntimeError(f"[MinerU] PDF file not exists: {pdf_file_path}")

        pdf_file_name = Path(pdf_file_path).stem.strip()
        output_path = os.path.join(str(output_dir), pdf_file_name, method)
        os.makedirs(output_path, exist_ok=True)

        files = {"files": (pdf_file_name + ".pdf", open(pdf_file_path, "rb"), "application/pdf")}

        data = {
            "output_dir": "./output",
            "lang_list": lang,
            "backend": backend,
            "parse_method": method,
            "formula_enable": True,
            "table_enable": True,
            "server_url": None,
            "return_md": True,
            "return_middle_json": True,
            "return_model_output": True,
            "return_content_list": True,
            "return_images": True,
            "response_format_zip": True,
            "start_page_id": 0,
            "end_page_id": 99999,
        }

        headers = {"Accept": "application/json"}
        try:
            self.logger.info(f"[MinerU] invoke api: {self.mineru_api}/file_parse")
            if callback:
                callback(0.20, f"[MinerU] invoke api: {self.mineru_api}/file_parse")
            response = requests.post(url=f"{self.mineru_api}/file_parse", files=files, data=data, headers=headers, timeout=1800)

            response.raise_for_status()
            if response.headers.get("Content-Type") == "application/zip":
                self.logger.info(f"[MinerU] zip file returned, saving to {OUTPUT_ZIP_PATH}...")

                if callback:
                    callback(0.30, f"[MinerU] zip file returned, saving to {OUTPUT_ZIP_PATH}...")

                with open(OUTPUT_ZIP_PATH, "wb") as f:
                    f.write(response.content)

                self.logger.info(f"[MinerU] Unzip to {output_path}...")
                self._extract_zip_no_root(OUTPUT_ZIP_PATH, output_path, pdf_file_name + "/")

                if callback:
                    callback(0.40, f"[MinerU] Unzip to {output_path}...")
            else:
                self.logger.warning("[MinerU] not zip returned from api：%s " % response.headers.get("Content-Type"))
        except Exception as e:
            raise RuntimeError(f"[MinerU] api failed with exception {e}")
        self.logger.info("[MinerU] Api completed successfully.")

    def _run_mineru_executable(
        self, input_path: Path, output_dir: Path, method: str = "auto", backend: str = "pipeline", lang: Optional[str] = None, server_url: Optional[str] = None, callback: Optional[Callable] = None
    ):
        cmd = [str(self.mineru_path), "-p", str(input_path), "-o", str(output_dir), "-m", method]
        if backend:
            cmd.extend(["-b", backend])
        if lang:
            cmd.extend(["-l", lang])
        if server_url and backend == "vlm-http-client":
            cmd.extend(["-u", server_url])

        self.logger.info(f"[MinerU] Running command: {' '.join(cmd)}")

        subprocess_kwargs = {
            "stdout": subprocess.PIPE,
            "stderr": subprocess.PIPE,
            "text": True,
            "encoding": "utf-8",
            "errors": "ignore",
            "bufsize": 1,
        }

        if platform.system() == "Windows":
            subprocess_kwargs["creationflags"] = getattr(subprocess, "CREATE_NO_WINDOW", 0)

        process = subprocess.Popen(cmd, **subprocess_kwargs)
        stdout_queue, stderr_queue = Queue(), Queue()

        def enqueue_output(pipe, queue, prefix):
            for line in iter(pipe.readline, ""):
                if line.strip():
                    queue.put((prefix, line.strip()))
            pipe.close()

        threading.Thread(target=enqueue_output, args=(process.stdout, stdout_queue, "STDOUT"), daemon=True).start()
        threading.Thread(target=enqueue_output, args=(process.stderr, stderr_queue, "STDERR"), daemon=True).start()

        while process.poll() is None:
            for q in (stdout_queue, stderr_queue):
                try:
                    while True:
                        prefix, line = q.get_nowait()
                        if prefix == "STDOUT":
                            self.logger.info(f"[MinerU] {line}")
                        else:
                            self.logger.warning(f"[MinerU] {line}")
                except Empty:
                    pass
            time.sleep(0.1)

        return_code = process.wait()
        if return_code != 0:
            raise RuntimeError(f"[MinerU] Process failed with exit code {return_code}")
        self.logger.info("[MinerU] Command completed successfully.")

    def __images__(self, fnm, zoomin: int = 1, page_from=0, page_to=600, callback=None):
        self.page_from = page_from
        self.page_to = page_to
        try:
            with pdfplumber.open(fnm) if isinstance(fnm, (str, PathLike)) else pdfplumber.open(BytesIO(fnm)) as pdf:
                self.pdf = pdf
                self.page_images = [p.to_image(resolution=72 * zoomin, antialias=True).original for _, p in enumerate(self.pdf.pages[page_from:page_to])]
        except Exception as e:
            self.page_images = None
            self.total_page = 0
            logging.exception(e)

    def _line_tag(self, bx):
        pn = [bx["page_idx"] + 1]
        positions = bx["bbox"]
        x0, top, x1, bott = positions

        if hasattr(self, "page_images") and self.page_images and len(self.page_images) > bx["page_idx"]:
            page_width, page_height = self.page_images[bx["page_idx"]].size
            x0 = (x0 / 1000.0) * page_width
            x1 = (x1 / 1000.0) * page_width
            top = (top / 1000.0) * page_height
            bott = (bott / 1000.0) * page_height

        return "@@{}\t{:.1f}\t{:.1f}\t{:.1f}\t{:.1f}##".format("-".join([str(p) for p in pn]), x0, x1, top, bott)

    def crop(self, text, ZM=1, need_position=False):
        imgs = []
        poss = self.extract_positions(text)
        if not poss:
            if need_position:
                return None, None
            return

        max_width = max(np.max([right - left for (_, left, right, _, _) in poss]), 6)
        GAP = 6
        pos = poss[0]
        poss.insert(0, ([pos[0][0]], pos[1], pos[2], max(0, pos[3] - 120), max(pos[3] - GAP, 0)))
        pos = poss[-1]
        poss.append(([pos[0][-1]], pos[1], pos[2], min(self.page_images[pos[0][-1]].size[1], pos[4] + GAP), min(self.page_images[pos[0][-1]].size[1], pos[4] + 120)))

        positions = []
        for ii, (pns, left, right, top, bottom) in enumerate(poss):
            right = left + max_width

            if bottom <= top:
                bottom = top + 2

            for pn in pns[1:]:
                bottom += self.page_images[pn - 1].size[1]

            img0 = self.page_images[pns[0]]
            x0, y0, x1, y1 = int(left), int(top), int(right), int(min(bottom, img0.size[1]))
            crop0 = img0.crop((x0, y0, x1, y1))
            imgs.append(crop0)
            if 0 < ii < len(poss) - 1:
                positions.append((pns[0] + self.page_from, x0, x1, y0, y1))

            bottom -= img0.size[1]
            for pn in pns[1:]:
                page = self.page_images[pn]
                x0, y0, x1, y1 = int(left), 0, int(right), int(min(bottom, page.size[1]))
                cimgp = page.crop((x0, y0, x1, y1))
                imgs.append(cimgp)
                if 0 < ii < len(poss) - 1:
                    positions.append((pn + self.page_from, x0, x1, y0, y1))
                bottom -= page.size[1]

        if not imgs:
            if need_position:
                return None, None
            return

        height = 0
        for img in imgs:
            height += img.size[1] + GAP
        height = int(height)
        width = int(np.max([i.size[0] for i in imgs]))
        pic = Image.new("RGB", (width, height), (245, 245, 245))
        height = 0
        for ii, img in enumerate(imgs):
            if ii == 0 or ii + 1 == len(imgs):
                img = img.convert("RGBA")
                overlay = Image.new("RGBA", img.size, (0, 0, 0, 0))
                overlay.putalpha(128)
                img = Image.alpha_composite(img, overlay).convert("RGB")
            pic.paste(img, (0, int(height)))
            height += img.size[1] + GAP

        if need_position:
            return pic, positions
        return pic

    @staticmethod
    def extract_positions(txt: str):
        poss = []
        for tag in re.findall(r"@@[0-9-]+\t[0-9.\t]+##", txt):
            pn, left, right, top, bottom = tag.strip("#").strip("@").split("\t")
            left, right, top, bottom = float(left), float(right), float(top), float(bottom)
            poss.append(([int(p) - 1 for p in pn.split("-")], left, right, top, bottom))
        return poss

    def _read_output(self, output_dir: Path, file_stem: str, method: str = "auto", backend: str = "pipeline") -> list[dict[str, Any]]:
        subdir = output_dir / file_stem / method
        if backend.startswith("vlm-"):
            subdir = output_dir / file_stem / "vlm"
        json_file = subdir / f"{file_stem}_content_list.json"

        if not json_file.exists():
            raise FileNotFoundError(f"[MinerU] Missing output file: {json_file}")

        with open(json_file, "r", encoding="utf-8") as f:
            data = json.load(f)

        for item in data:
            for key in ("img_path", "table_img_path", "equation_img_path"):
                if key in item and item[key]:
                    item[key] = str((subdir / item[key]).resolve())
        return data

    def _transfer_to_sections(self, outputs: list[dict[str, Any]]):
        sections = []
        for output in outputs:
            match output["type"]:
                case MinerUContentType.TEXT:
                    section = output["text"]
                case MinerUContentType.TABLE:
                    section = output.get("table_body", "") + "\n".join(output.get("table_caption", [])) + "\n".join(output.get("table_footnote", []))
                    if not section.strip():
                        section = "FAILED TO PARSE TABLE"
                case MinerUContentType.IMAGE:
                    section = "".join(output["image_caption"]) + "\n" + "".join(output["image_footnote"])
                case MinerUContentType.EQUATION:
                    section = output["text"]
                case MinerUContentType.CODE:
                    section = output["code_body"] + "\n".join(output.get("code_caption", []))
                case MinerUContentType.LIST:
                    section = "\n".join(output.get("list_items", []))
                case MinerUContentType.DISCARDED:
                    pass

            if section:
                sections.append((section, self._line_tag(output)))
        return sections

    def _transfer_to_tables(self, outputs: list[dict[str, Any]]):
        return []

    def parse_pdf(
        self,
        filepath: str | PathLike[str],
        binary: Optional[Union[BytesIO, bytes]] = None,
        callback: Optional[Callable] = None,
        *,
        output_dir: Optional[str] = None,
        backend: str = "pipeline",
        lang: Optional[str] = None,
        method: str = "auto",
        server_url: Optional[str] = None,
        delete_output: bool = True,
    ) -> tuple:
        import shutil

        temp_pdf = None
        created_tmp_dir = False

        # remove spaces, or mineru crash, and _read_output fail too
        file_path = Path(filepath)
        pdf_file_name = file_path.stem.replace(" ", "") + ".pdf"
        pdf_file_path_valid = os.path.join(file_path.parent, pdf_file_name)

        if binary:
            temp_dir = Path(tempfile.mkdtemp(prefix="mineru_bin_pdf_"))
            temp_pdf = temp_dir / pdf_file_name
            with open(temp_pdf, "wb") as f:
                f.write(binary)
            pdf = temp_pdf
            self.logger.info(f"[MinerU] Received binary PDF -> {temp_pdf}")
            if callback:
                callback(0.15, f"[MinerU] Received binary PDF -> {temp_pdf}")
        else:
            if pdf_file_path_valid != filepath:
                self.logger.info(f"[MinerU] Remove all space in file name: {pdf_file_path_valid}")
                shutil.move(filepath, pdf_file_path_valid)
            pdf = Path(pdf_file_path_valid)
            if not pdf.exists():
                if callback:
                    callback(-1, f"[MinerU] PDF not found: {pdf}")
                raise FileNotFoundError(f"[MinerU] PDF not found: {pdf}")

        if output_dir:
            out_dir = Path(output_dir)
            out_dir.mkdir(parents=True, exist_ok=True)
        else:
            out_dir = Path(tempfile.mkdtemp(prefix="mineru_pdf_"))
            created_tmp_dir = True

        self.logger.info(f"[MinerU] Output directory: {out_dir}")
        if callback:
            callback(0.15, f"[MinerU] Output directory: {out_dir}")

        self.__images__(pdf, zoomin=1)

        try:
            self._run_mineru(pdf, out_dir, method=method, backend=backend, lang=lang, server_url=server_url, callback=callback)
            outputs = self._read_output(out_dir, pdf.stem, method=method, backend=backend)
            self.logger.info(f"[MinerU] Parsed {len(outputs)} blocks from PDF.")
            if callback:
                callback(0.75, f"[MinerU] Parsed {len(outputs)} blocks from PDF.")
            return self._transfer_to_sections(outputs), self._transfer_to_tables(outputs)
        finally:
            if temp_pdf and temp_pdf.exists():
                try:
                    temp_pdf.unlink()
                    temp_pdf.parent.rmdir()
                except Exception:
                    pass
            if delete_output and created_tmp_dir and out_dir.exists():
                try:
                    shutil.rmtree(out_dir)
                except Exception:
                    pass


if __name__ == "__main__":
    parser = MinerUParser("mineru")
    ok, reason = parser.check_installation()
    print("MinerU available:", ok)

    filepath = ""
    with open(filepath, "rb") as file:
        outputs = parser.parse_pdf(filepath=filepath, binary=file.read())
        for output in outputs:
            print(output)
