# tools_manager.py

import os
import re
import json
import math
from datetime import datetime


class ToolsManager:
    def __init__(self):
        self.base_dir = "tools_records"
        os.makedirs(self.base_dir, exist_ok=True)

    def safe_name(self, value):
        value = str(value or "").strip()
        value = re.sub(r"[^a-zA-Z0-9_\-ء-ي]+", "_", value)
        return value[:80] or "student"

    def calculate(self, expression):
        try:
            expression = str(expression or "").strip()

            if not expression:
                return {
                    "success": False,
                    "message": "اكتب العملية الحسابية أولًا."
                }

            expression = expression.replace("^", "**")

            allowed_names = {
                "sqrt": math.sqrt,
                "sin": math.sin,
                "cos": math.cos,
                "tan": math.tan,
                "pi": math.pi,
                "e": math.e,
                "abs": abs,
                "round": round,
                "pow": pow
            }

            result = eval(expression, {"__builtins__": {}}, allowed_names)

            return {
                "success": True,
                "message": f"النتيجة: {result}",
                "result": result
            }

        except Exception as e:
            return {
                "success": False,
                "message": f"تعذر الحساب: {e}"
            }

    def save_student_tool_note(self, identity, context, note, uploaded_file=None):
        try:
            identity = self.safe_name(identity)
            context = str(context or "عام").strip()
            note = str(note or "").strip()

            student_dir = os.path.join(self.base_dir, identity)
            os.makedirs(student_dir, exist_ok=True)

            stamp = datetime.utcnow().strftime("%Y%m%d_%H%M%S")

            uploaded_path = None
            if uploaded_file is not None:
                try:
                    uploaded_path = uploaded_file.name
                except Exception:
                    uploaded_path = str(uploaded_file)

            payload = {
                "identity": identity,
                "context": context,
                "note": note,
                "uploaded_file": uploaded_path,
                "created_at": datetime.utcnow().isoformat(),
                "status": "saved_for_teacher_review"
            }

            path = os.path.join(student_dir, f"tool_note_{stamp}.json")

            with open(path, "w", encoding="utf-8") as f:
                json.dump(payload, f, ensure_ascii=False, indent=2)

            return {
                "success": True,
                "message": f"تم حفظ الملاحظة/السؤال لمراجعة الأستاذ: {path}",
                "path": path
            }

        except Exception as e:
            return {
                "success": False,
                "message": f"فشل حفظ الملاحظة: {e}"
            }

    def get_whiteboard_html(self):
        return """
<div style="direction:rtl; font-family:Arial; border:1px solid #cbd5e1; border-radius:14px; padding:10px; background:#f8fafc;">
    <h3>السبورة التجريبية</h3>

    <div style="display:flex; flex-wrap:wrap; gap:8px; margin-bottom:8px;">
        <button onclick="dtSetTool('pen')" type="button">قلم</button>
        <button onclick="dtSetTool('eraser')" type="button">محاية</button>
        <button onclick="dtClearBoard()" type="button">مسح</button>
        <button onclick="dtDownloadBoard()" type="button">حفظ صورة السبورة</button>

        <label>
            الحجم
            <input id="dt_size" type="range" min="1" max="14" value="4">
        </label>

        <label>
            اللون
            <input id="dt_color" type="color" value="#000000">
        </label>
    </div>

    <div style="height:420px; overflow:auto; border:2px solid #334155; border-radius:12px; background:#e2e8f0;">
        <canvas id="dt_board" width="1200" height="1700" style="display:block; background:white; touch-action:none;"></canvas>
    </div>

    <p style="font-size:13px; color:#475569;">
        هذه نسخة خفيفة آمنة. احفظ صورة السبورة، ثم يمكنك رفعها من أدواتي ليشاهدها الأستاذ.
    </p>
</div>

<script>
(function () {
    const canvas = document.getElementById("dt_board");
    if (!canvas) return;

    const ctx = canvas.getContext("2d");
    let drawing = false;
    let tool = "pen";
    let lastX = 0;
    let lastY = 0;

    function grid() {
        ctx.save();
        ctx.strokeStyle = "#e5e7eb";
        ctx.lineWidth = 1;

        for (let x = 0; x < canvas.width; x += 32) {
            ctx.beginPath();
            ctx.moveTo(x, 0);
            ctx.lineTo(x, canvas.height);
            ctx.stroke();
        }

        for (let y = 0; y < canvas.height; y += 32) {
            ctx.beginPath();
            ctx.moveTo(0, y);
            ctx.lineTo(canvas.width, y);
            ctx.stroke();
        }

        ctx.restore();
    }

    window.dtSetTool = function (nextTool) {
        tool = nextTool;
    };

    window.dtClearBoard = function () {
        ctx.clearRect(0, 0, canvas.width, canvas.height);
        grid();
    };

    window.dtDownloadBoard = function () {
        const link = document.createElement("a");
        link.download = "student_whiteboard.png";
        link.href = canvas.toDataURL("image/png");
        link.click();
    };

    function getPoint(event) {
        const rect = canvas.getBoundingClientRect();
        return {
            x: event.clientX - rect.left,
            y: event.clientY - rect.top
        };
    }

    function start(event) {
        event.preventDefault();
        drawing = true;
        const p = getPoint(event);
        lastX = p.x;
        lastY = p.y;
    }

    function move(event) {
        if (!drawing) return;
        event.preventDefault();

        const p = getPoint(event);
        const sizeInput = document.getElementById("dt_size");
        const colorInput = document.getElementById("dt_color");

        ctx.beginPath();
        ctx.moveTo(lastX, lastY);
        ctx.lineTo(p.x, p.y);

        if (tool === "eraser") {
            ctx.strokeStyle = "#ffffff";
            ctx.lineWidth = Math.max(18, parseInt(sizeInput.value, 10) * 3);
        } else {
            ctx.strokeStyle = colorInput.value;
            ctx.lineWidth = parseInt(sizeInput.value, 10);
        }

        ctx.lineCap = "round";
        ctx.lineJoin = "round";
        ctx.stroke();

        lastX = p.x;
        lastY = p.y;
    }

    function stop() {
        drawing = false;
    }

    canvas.addEventListener("pointerdown", start);
    canvas.addEventListener("pointermove", move);
    window.addEventListener("pointerup", stop);
    window.addEventListener("pointercancel", stop);

    grid();
})();
</script>
""".strip()