from __future__ import annotations

import sys
import urllib.request
from pathlib import Path

from arabic_reshaper import reshape
from bidi.algorithm import get_display
from PIL import Image, ImageDraw, ImageFont

ROOT = Path(__file__).resolve().parents[1]
if str(ROOT) not in sys.path:
    sys.path.insert(0, str(ROOT))

from ocr_studio.config import ARABIC_FONT_PATH, EXAMPLES_DIR, FONTS_DIR, LATIN_FONT_PATH

FONT_SOURCES = {
    LATIN_FONT_PATH: (
        "https://cdn.jsdelivr.net/gh/googlefonts/noto-fonts@main/hinted/ttf/NotoSans/NotoSans-Regular.ttf",
        "https://github.com/notofonts/latin-greek-cyrillic/raw/main/fonts/NotoSans/hinted/ttf/NotoSans-Regular.ttf",
    ),
    ARABIC_FONT_PATH: (
        "https://cdn.jsdelivr.net/gh/googlefonts/noto-fonts@main/hinted/ttf/NotoNaskhArabic/NotoNaskhArabic-Regular.ttf",
        "https://github.com/notofonts/notonaskharabic/raw/main/fonts/NotoNaskhArabic/hinted/ttf/NotoNaskhArabic-Regular.ttf",
    ),
}


def _download(path: Path, urls: tuple[str, ...]) -> None:
    path.parent.mkdir(parents=True, exist_ok=True)
    last_error: Exception | None = None
    for url in urls:
        try:
            with urllib.request.urlopen(url, timeout=60) as response:
                data = response.read()
            if len(data) < 10_000:
                continue
            path.write_bytes(data)
            return
        except Exception as exc:  # noqa: BLE001
            last_error = exc
    if last_error:
        raise last_error


def _font(path: Path, size: int) -> ImageFont.FreeTypeFont | ImageFont.ImageFont:
    if path.exists():
        return ImageFont.truetype(str(path), size=size)
    return ImageFont.load_default()


def _shape(text: str) -> str:
    if any("\u0600" <= char <= "\u06ff" for char in text):
        return get_display(reshape(text))
    return text


def _render(path: Path, lines: list[list[tuple[str, Path, int]]], align: str = "left") -> None:
    width, height = 1280, 760
    image = Image.new("RGB", (width, height), "#f7f3ea")
    draw = ImageDraw.Draw(image)
    draw.rectangle((36, 36, width - 36, height - 36), outline="#1f4f4a", width=3)
    y = 88
    for segments in lines:
        x = 80 if align == "left" else width - 80
        if align == "right":
            for text, font_path, size in reversed(segments):
                font = _font(font_path, size)
                shaped = _shape(text)
                bbox = draw.textbbox((0, 0), shaped, font=font)
                text_w = bbox[2] - bbox[0]
                x -= text_w
                draw.text((x, y), shaped, fill="#1c1915", font=font)
                x -= 12
        else:
            for text, font_path, size in segments:
                font = _font(font_path, size)
                shaped = _shape(text)
                draw.text((x, y), shaped, fill="#1c1915", font=font)
                bbox = draw.textbbox((0, 0), shaped, font=font)
                x += bbox[2] - bbox[0] + 10
        y += max(size for _, _, size in segments) + 28
    path.parent.mkdir(parents=True, exist_ok=True)
    image.save(path, format="PNG")


def main() -> None:
    FONTS_DIR.mkdir(parents=True, exist_ok=True)
    EXAMPLES_DIR.mkdir(parents=True, exist_ok=True)
    for destination, urls in FONT_SOURCES.items():
        if destination.exists():
            continue
        try:
            _download(destination, urls)
        except Exception as exc:  # noqa: BLE001
            print(f"Font download skipped for {destination.name}: {exc}")

    _render(
        EXAMPLES_DIR / "english-print.png",
        [
            [("INVOICE 1048", LATIN_FONT_PATH, 42)],
            [("Customer: Jane Walton", LATIN_FONT_PATH, 32)],
            [("Amount due: 128.40 USD", LATIN_FONT_PATH, 32)],
            [("Due date: 24 August 2026", LATIN_FONT_PATH, 32)],
        ],
    )
    _render(
        EXAMPLES_DIR / "persian-print.png",
        [
            [("فاکتور ۱۰۴۸", ARABIC_FONT_PATH, 44)],
            [("خریدار: سارا محمدی", ARABIC_FONT_PATH, 34)],
            [("مبلغ قابل پرداخت: ۱۲۸۴۰۰۰ تومان", ARABIC_FONT_PATH, 34)],
            [("تاریخ سررسید: ۳ شهریور ۱۴۰۵", ARABIC_FONT_PATH, 34)],
        ],
        align="right",
    )
    _render(
        EXAMPLES_DIR / "mixed-print.png",
        [
            [("BOARDING PASS / ", LATIN_FONT_PATH, 36), ("کارت پرواز", ARABIC_FONT_PATH, 36)],
            [("Passenger / ", LATIN_FONT_PATH, 30), ("مسافر: ", ARABIC_FONT_PATH, 30), ("Ali Rezaei", LATIN_FONT_PATH, 30)],
            [("Flight / ", LATIN_FONT_PATH, 30), ("پرواز: ", ARABIC_FONT_PATH, 30), ("W5 1084", LATIN_FONT_PATH, 30)],
            [("Seat / ", LATIN_FONT_PATH, 30), ("صندلی: ", ARABIC_FONT_PATH, 30), ("14A", LATIN_FONT_PATH, 30)],
        ],
    )


if __name__ == "__main__":
    main()