from datetime import datetime
import io
import base64
from fastapi import APIRouter
from fastapi.responses import JSONResponse
from pydantic import BaseModel, Field
from sqlmodel import Session, func, select
from sqlmodel.sql.expression import SelectOfScalar
from db import Chemistry, Player, engine
import networkx as nx
import matplotlib

matplotlib.use("agg")
import matplotlib.pyplot as plt


analysis_router = APIRouter(prefix="/analysis")


C = Chemistry
P = Player


def sociogram_json():
    nodes = []
    necessary_nodes = set()
    links = []
    with Session(engine) as session:
        for p in session.exec(select(P)).fetchall():
            nodes.append({"id": p.name, "appearance": 1})
        subquery = (
            select(C.user, func.max(C.time).label("latest"))
            .where(C.time > datetime(2025, 2, 1, 10))
            .group_by(C.user)
            .subquery()
        )
        statement2 = select(C).join(
            subquery, (C.user == subquery.c.user) & (C.time == subquery.c.latest)
        )
        for c in session.exec(statement2):
            # G.add_node(c.user)
            necessary_nodes.add(c.user)
            for p in c.love:
                # G.add_edge(c.user, p)
                # p_id = session.exec(select(P.id).where(P.name == p)).one()
                necessary_nodes.add(p)
                links.append({"source": c.user, "target": p})
    # nodes = [n for n in nodes if n["name"] in necessary_nodes]
    return JSONResponse({"nodes": nodes, "links": links})


def sociogram_data(show: int | None = 2):
    G = nx.DiGraph()
    with Session(engine) as session:
        for p in session.exec(select(P)).fetchall():
            G.add_node(p.name)
        subquery = (
            select(C.user, func.max(C.time).label("latest"))
            .where(C.time > datetime(2025, 2, 1, 10))
            .group_by(C.user)
            .subquery()
        )
        statement2 = (
            select(C)
            # .where(C.user.in_(["Kruse", "Franz", "ck"]))
            .join(subquery, (C.user == subquery.c.user) & (C.time == subquery.c.latest))
        )
        for c in session.exec(statement2):
            if show >= 1:
                for i, p in enumerate(c.love):
                    G.add_edge(c.user, p, group="love", rank=i, popularity=1 - 0.08 * i)
            if show <= 1:
                for i, p in enumerate(c.hate):
                    G.add_edge(c.user, p, group="hate", rank=8, popularity=-0.16)
    return G


class Params(BaseModel):
    node_size: int | None = Field(default=2400, alias="nodeSize")
    font_size: int | None = Field(default=10, alias="fontSize")
    arrow_size: int | None = Field(default=20, alias="arrowSize")
    edge_width: float | None = Field(default=1, alias="edgeWidth")
    distance: float | None = 0.2
    weighting: bool | None = True
    popularity: bool | None = True
    show: int | None = 2


ARROWSTYLE = {"love": "-|>", "hate": "-|>"}
EDGESTYLE = {"love": "-", "hate": ":"}
EDGECOLOR = {"love": "#404040", "hate": "#cc0000"}


async def render_sociogram(params: Params):
    plt.figure(figsize=(16, 10), facecolor="none")
    ax = plt.gca()
    ax.set_facecolor("none")  # Set the axis face color to none (transparent)
    ax.axis("off")  # Turn off axis ticks and frames

    G = sociogram_data(show=params.show)
    pos = nx.spring_layout(G, scale=2, k=params.distance, iterations=50, seed=None)
    nodes = nx.draw_networkx_nodes(
        G,
        pos,
        node_color=[
            v for k, v in G.in_degree(weight="popularity" if params.weighting else None)
        ]
        if params.popularity
        else "#99ccff",
        edgecolors="#404040",
        linewidths=0,
        # node_shape="8",
        node_size=params.node_size,
        cmap="coolwarm",
        alpha=0.86,
    )
    if params.popularity:
        cbar = plt.colorbar(nodes)
        cbar.ax.set_xlabel("popularity")
    nx.draw_networkx_labels(G, pos, font_size=params.font_size)
    nx.draw_networkx_edges(
        G,
        pos,
        arrows=True,
        edge_color=[EDGECOLOR[G.edges()[*edge]["group"]] for edge in G.edges()],
        arrowsize=params.arrow_size,
        node_size=params.node_size,
        width=params.edge_width,
        style=[EDGESTYLE[G.edges()[*edge]["group"]] for edge in G.edges()],
        arrowstyle=[ARROWSTYLE[G.edges()[*edge]["group"]] for edge in G.edges()],
        connectionstyle="arc3,rad=0.12",
        alpha=[1 - 0.08 * G.edges()[*edge]["rank"] for edge in G.edges()]
        if params.weighting
        else 1,
    )

    buf = io.BytesIO()
    plt.savefig(buf, format="png", bbox_inches="tight", dpi=300, transparent=True)
    buf.seek(0)
    encoded_image = base64.b64encode(buf.read()).decode("UTF-8")
    plt.close()

    return {"image": encoded_image}


analysis_router.add_api_route("/json", endpoint=sociogram_json, methods=["GET"])
analysis_router.add_api_route("/image", endpoint=render_sociogram, methods=["POST"])

if __name__ == "__main__":
    with Session(engine) as session:
        statement: SelectOfScalar[P] = select(func.count(P.id))
        print("players in DB: ", session.exec(statement).first())
    G = sociogram_data()
    pos = nx.spring_layout(G, scale=1, k=2, iterations=50, seed=42)