#!/usr/bin/env python
import argparse
import json
import sys
from collections import defaultdict, deque
from itertools import chain
from typing import Any, DefaultDict, Dict, List

from .pdf import PDF

if len(sys.argv) == 1:
    sys.argv.append("--help")


def parse_page_spec(p_str: str) -> List[int]:
    if "-" in p_str:
        start, end = map(int, p_str.split("-"))
        return list(range(start, end + 1))
    else:
        return [int(p_str)]


def parse_args(args_raw: List[str]) -> argparse.Namespace:
    parser = argparse.ArgumentParser("pdfplumber")

    parser.add_argument("infile", nargs="?", type=argparse.FileType("rb"))
    group = parser.add_mutually_exclusive_group()
    group.add_argument(
        "--structure",
        help="Write the structure tree as JSON.  "
        "All other arguments except --pages, --laparams, and --indent will be ignored",
        action="store_true",
    )
    group.add_argument(
        "--structure-text",
        help="Write the structure tree as JSON including text contents.  "
        "All other arguments except --pages, --laparams, and --indent will be ignored",
        action="store_true",
    )

    parser.add_argument("--format", choices=["csv", "json", "text"], default="csv")

    parser.add_argument("--types", nargs="+")

    parser.add_argument(
        "--include-attrs",
        nargs="+",
        help="Include *only* these object attributes in output.",
    )

    parser.add_argument(
        "--exclude-attrs",
        nargs="+",
        help="Exclude these object attributes from output.",
    )

    parser.add_argument("--laparams", type=json.loads)

    parser.add_argument("--precision", type=int)

    parser.add_argument("--pages", nargs="+", type=parse_page_spec)

    parser.add_argument(
        "--indent", type=int, help="Indent level for JSON pretty-printing."
    )

    args = parser.parse_args(args_raw)
    if args.pages is not None:
        args.pages = list(chain(*args.pages))
    return args


def add_text_to_mcids(pdf: PDF, data: List[Dict[str, Any]]) -> None:
    page_contents: DefaultDict[int, Any] = defaultdict(lambda: defaultdict(str))
    for page in pdf.pages:
        text_contents = page_contents[page.page_number]
        for c in page.chars:
            mcid = c.get("mcid")
            if mcid is None:
                continue
            text_contents[mcid] += c["text"]
    d = deque(data)
    while d:
        el = d.popleft()
        if "children" in el:
            d.extend(el["children"])
        pageno = el.get("page_number")
        if pageno is None:
            continue
        text_contents = page_contents[pageno]
        if "mcids" in el:
            el["text"] = [text_contents[mcid] for mcid in el["mcids"]]


def main(args_raw: List[str] = sys.argv[1:]) -> None:
    args = parse_args(args_raw)

    with PDF.open(args.infile, pages=args.pages, laparams=args.laparams) as pdf:
        if args.structure:
            print(json.dumps(pdf.structure_tree, indent=args.indent))
        elif args.structure_text:
            tree = pdf.structure_tree
            add_text_to_mcids(pdf, tree)
            print(json.dumps(tree, indent=args.indent, ensure_ascii=False))
        elif args.format == "csv":
            pdf.to_csv(
                sys.stdout,
                args.types,
                precision=args.precision,
                include_attrs=args.include_attrs,
                exclude_attrs=args.exclude_attrs,
            )
        elif args.format == "text":
            for page in pdf.pages:
                print(page.extract_text(layout=True))
        else:
            pdf.to_json(
                sys.stdout,
                args.types,
                precision=args.precision,
                include_attrs=args.include_attrs,
                exclude_attrs=args.exclude_attrs,
                indent=args.indent,
            )


if __name__ == "__main__":
    main()