from smathpy import Worksheet, TextRegion, MathRegion, var, assign, evaluate

ws = Worksheet(title="My Calculation", author="Engineer")

ws.add(TextRegion.title("Simple Calculation"))
ws.add(TextRegion.section("Input data:"))
ws.add(MathRegion.assignment("L", 3, unit_name="m"))
ws.add(MathRegion.assignment("q", 4, unit_name="kN"))

ws.add(TextRegion.section("Calculation:"))
ws.add(MathRegion(expr=assign("R", var("q") * var("L") / 2)))

ws.add(TextRegion.section("Result:"))
ws.add(MathRegion.evaluation("R", contract_unit="kN"))

ws.save("calculation.sm")

from smathpy import var, num, assign, func_assign

x = var("x")
expr = x ** 2 + 3 * x - 1       # builds RPN automatically

# Function definitions
f_def = func_assign("f", ["x"], x ** 2)

# Assignments
a = assign("h", (var("b") - var("a")) / var("n"))

from smathpy import MathRegion
from smathpy.units import with_unit, value_with_compound_unit, compound_unit, power_unit

# Simple unit: L := 3 * m
MathRegion.assignment("L", 3, unit_name="m")

# Compound unit: q := 4 * kN/m
from smathpy import assign
assign("q", value_with_compound_unit(4, ["kN"], ["m"]))

# Unit as contract_expr (display result in specific unit)
MathRegion(expr=assign("A_s", ...), show_result=True, contract_expr=compound_unit(["mm", "mm"], []))

# Unit raised to a power (more semantic alternative for mm²)
MathRegion(expr=assign("A_s", ...), show_result=True, contract_expr=power_unit("mm", 2))

from smathpy.expression import mat, el, det, transpose

# 2×2 matrix
m = mat([[1, 2], [3, 4]])

# Element access
e = el("A", "i", "j")

# Operations
d = det("A")
t = transpose("A")

from smathpy.expression import for_range, while_loop, if_, line, range_, sum_

# For loop with range
body = assign("s", var("s") + var("i"))
loop = for_range("i", range_(1, "n"), body)

# While loop
w = while_loop(var("x") > 0, assign("x", var("x") - 1))

# Conditional
c = if_(var("x") > 0, var("a"), var("b"))

# Summation
s = sum_(var("k") ** 2, "k", 1, "n")

from smathpy.expression import (
    abs_, sin, cos, tan, sqrt, exp, ln,    # math
    diff, diff_n, integral,                 # calculus
    concat, num2str,                        # string
    mod, sign, eval_,                       # misc
)

TextRegion.title("Title")          # Bold, blue, 12pt
TextRegion.section("Input data:")  # Bordered, gray background
TextRegion(texts={"eng": "Hello", "rus": "Привет"})  # Multilingual

ws.add(MathRegion(expr=assign("a", ...)))
ws.add_spacing(10)   # add 10 px gap
ws.add(MathRegion(expr=assign("b", ...)))
ws.add_spacing(40)   # larger visual break before next section