import itertools
import io
from fastapi.responses import StreamingResponse
from pathlib import Path
import pyvips
import logging
from perlin import CoordsGenerator
import svg

import numpy as np
import uvicorn
from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware

app = FastAPI(title="Speckles API", root_path="/images")
origins = [
    "http://localhost",
    "http://localhost:3000",
    "https://localhost",
    "https://0124816.xyz",
    "http://0124816.xyz:3001",
]

app.add_middleware(
    CORSMiddleware,
    allow_origins=origins,
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

RGen = np.random.default_rng()

MEDIA_TYPES = {
    "png": "image/png",
    "jpeg": "image/jpeg",
    "jpg": "image/jpeg",
    "svg": "image/svg+xml",
    "pdf": "application/pdf",
}


def emoji(marker: str, source="twemoji"):
    if len(marker) != 1:
        return
    if source == "openmoji":
        scaler = 512
        file = hex(ord(marker))[2:].upper()
    elif source == "twemoji":
        scaler = 768
        file = hex(ord(marker))[2:]
    file = Path(f"{source}/{file}.svg")
    if file.is_file():
        return svg.G(
            elements=[Include(text=file.read_text())],
            id=marker,
            transform=[svg.Scale(100 / scaler)],
        )


class Include(svg.Element):
    element_name = "svg"
    transform: list[svg.Transform] | None = None

    def __str__(self) -> str:
        return self.text


DEFINED = ".o+tYP-|sSex*"


def markertoSVG(marker, x, y, c, s):
    if marker == ".":
        return svg.Circle(cx=x, cy=y, fill=c, r=np.sqrt(s))
    elif marker == "o":
        return svg.Circle(
            cx=x,
            cy=y,
            stroke=c,
            fill="none",
            stroke_width=np.sqrt(s / 4),
            r=np.sqrt(s),
        )
    elif marker == "+":
        shift = np.sqrt(s)
        return svg.Path(
            stroke=c,
            stroke_width=np.sqrt(s) / 4,
            stroke_linecap="round",
            d=[
                svg.M(x - shift, y),  # horizontal line
                svg.L(x + shift, y),
                svg.M(x, y - shift),  # vertical line
                svg.L(x, y + shift),
            ],
        )
    elif marker == "t":
        shift = np.sqrt(s)
        return svg.Polygon(
            stroke=c,
            stroke_width=np.sqrt(s) / 4,
            stroke_linejoin="round",
            points=[
                x + shift * np.sqrt(3) / 2,
                y - shift / 2,
                x - shift * np.sqrt(3) / 2,
                y - shift / 2,
                x,
                y + shift,
            ],
            transform=[svg.Rotate(RGen.random() * 360, x, y)],
        )
    elif marker == "Y":
        shift = np.sqrt(s)
        return svg.Path(
            stroke=c,
            stroke_width=np.sqrt(s) / 4,
            stroke_linecap="round",
            d=[
                svg.M(x + shift * np.sqrt(3) / 2, y - shift / 2),  # / line
                svg.L(x, y),
                svg.M(x - shift * np.sqrt(3) / 2, y - shift / 2),  # / line
                svg.L(x, y),
                svg.M(x, y + shift),  # / line
                svg.L(x, y),
            ],
            transform=[svg.Rotate(RGen.random() * 360, x, y)],
        )
    elif marker == "P":
        shift = np.sqrt(s)
        return svg.Path(
            stroke=c,
            stroke_width=np.sqrt(s) * 2 / 3,
            d=[
                svg.M(x - shift, y),  # horizontal line
                svg.L(x + shift, y),
                svg.M(x, y - shift),  # vertical line
                svg.L(x, y + shift),
            ],
        )
    elif marker == "-":
        shift = np.sqrt(s)
        return svg.Path(
            stroke=c,
            stroke_width=np.sqrt(s) / 4,
            d=[
                svg.M(x - shift, y),  # horizontal line
                svg.L(x + shift, y),
            ],
        )
    elif marker == "|":
        shift = np.sqrt(s)
        return svg.Path(
            stroke=c,
            stroke_width=np.sqrt(s) / 4,
            d=[
                svg.M(x, y - shift),  # vertical line
                svg.L(x, y + shift),
            ],
        )
    elif marker == "s":
        shift = np.sqrt(s) * 2
        return svg.Rect(x=x, y=y, width=shift, height=shift, fill=c)
    elif marker == "S":
        s = np.sqrt(s) * 2
        return svg.Rect(x=x, y=y, width=s, height=s, fill=c, rx=s / 3, ry=s / 3)
    elif marker == "e":
        s = np.sqrt(s * 2)
        return svg.Ellipse(
            cx=x,
            cy=y,
            fill=c,
            rx=s,
            ry=s / 2,
            transform=[svg.Rotate(RGen.random() * 360, x, y)],
        )
    elif marker == "x":
        shift = np.sqrt(s)
        scale = np.sqrt(2) / 2
        return svg.Path(
            stroke=c,
            stroke_width=np.sqrt(s) / 4,
            stroke_linecap="round",
            d=[
                svg.M(x - shift * scale, y - shift * scale),  # / line
                svg.L(x + shift * scale, y + shift * scale),
                svg.M(x - shift * scale, y + shift * scale),
                svg.L(x + shift * scale, y - shift * scale),  # / line
            ],
        )
    elif marker == "*":
        shift = np.sqrt(s)
        return [
            svg.Path(
                stroke=c,
                stroke_width=np.sqrt(s) / 4,
                stroke_linecap="round",
                transform=[svg.Rotate(angle, x, y)],
                d=[
                    svg.M(x - shift, y),
                    svg.L(x + shift, y),
                ],
            )
            for angle in (0, 60, -60)
        ]
    else:
        return svg.Use(
            href=f"#{marker}",
            transform=[svg.Translate(x=x, y=y), svg.Scale(np.sqrt(s) / 100)],
        )


@app.get("/speckles/")
def make_wallpaper(
    speckle_colours: str,
    density: float = 0.12,
    size: float = 3,
    fileformat: str = "svg",
    orientation: str = "landscape",
    filename: str = "",
    markers: str = ".",
    perlin: bool = True,
):
    speckle_colours = speckle_colours.split(",")
    background = speckle_colours.pop(0)
    if orientation == "portrait":
        x, y = (1080, 1920)
    elif orientation == "landscape":
        x, y = (1920, 1080)
    elif "x" in orientation:
        resolution = orientation.split("x")
        if len(resolution) != 2:
            logging.critical("input resolution has more or less than 2 dimensions")
            return
        x, y = resolution
        if all([x.isdigit(), y.isdigit()]):
            x, y = int(x), int(y)
        else:
            return
    else:
        x, y = (1920, 1080)
    speckles_per_colour = int(x / 128 * y / 128 * density / len(markers))

    if perlin:
        gen = CoordsGenerator(x, y)

    elements = [svg.Rect(width=x, height=y, color=background)]
    style = svg.Style(
        text="\n".join(
            [f".c{colour[1:]} {{ fill: {colour}; }}" for colour in speckle_colours]
        )
    )
    elements.append(style)
    style = svg.Style(
        text="\n".join(
            [
                f'.s{hex(int(size*100))[2:]} {{ font-family: "OpenMoji"; font-size: {int(np.sqrt(size)*16)}px; }}'
                for size in np.logspace(0, size, 10, base=np.exp(2))
            ]
        )
    )
    elements.append(style)

    elements.append(
        svg.Defs(
            elements=[emoji(marker) for marker in markers if marker not in DEFINED]
        )
    )

    for colour, marker, size in itertools.product(
        speckle_colours,
        markers,
        np.logspace(0, size, 10, base=np.exp(2)),
    ):
        if perlin:
            xs, ys = gen.pick(speckles_per_colour)
        else:
            xs, ys = zip(
                RGen.random(speckles_per_colour) * x,
                RGen.random(speckles_per_colour) * y,
            )
        elements.extend(
            [markertoSVG(marker, x, y, colour, size) for x, y in zip(xs, ys)]
        )

    content = svg.SVG(width=x, height=y, elements=elements)
    if filename:
        if Path(filename).suffix == ".svg":
            with open(filename, "wt") as f:
                f.write(content.as_str())
        else:
            with pyvips.Image.svgload_buffer(content.as_str().encode("utf-8")) as image:
                image.write_to_file(filename)
        return filename
    elif fileformat:
        if fileformat == "svg":
            buf = io.BytesIO(content.as_str().encode("utf-8"))
            buf.seek(0)
        else:
            with pyvips.Image.svgload_buffer(content.as_str().encode("utf-8")) as image:
                buf = image.write_to_buffer(fileformat)
        return StreamingResponse(content=buf, media_type=MEDIA_TYPES[fileformat])


if __name__ == "__main__":
    uvicorn.run("speckles:app", workers=3, port=8099)