#!/usr/bin/env python3
"""Cum se masoara divergenta MDSRT — schema pe doua panouri (pret + indicator).

Pentru `strategii/07_mdsrt.md`, marcajul `<!-- DIAGRAMA: masurare -->` (Nivel 1,
§1.2 „Setup", dupa pasul 5). NU e grafic de pret cu candele: spec-ul cere o
schema de regula, cu linii, fara axe de pret reale, fara ticker, fara cifre de
pret. De aceea se scrie SVG de mana, doar stdlib — nu se folosesc
svg_candles / pchart.

Ce arata (toate etichetele si pragurile vin din spec / din Q&A):
- panoul de sus: linia pretului intr-un downtrend; L1 primul swing low
  important, L2 al doilea, mai jos → lower low;
- panoul de jos: linia indicatorului (Power / volum / RS) cu I1 si I2, al
  doilea mai sus → higher low = divergenta bull;
- bracket orizontal intre L1 si L2: „minim 5 candele intre puncte";
- bracket orizontal in stanga lui L2, pana la 60 de pasi in spate:
  „maxim 60 de candele in spate";
- al treilea swing low mic, la 2-3 pasi de L2, taiat cu cruce rosie si
  etichetat „2-3 candele → NU e divergenta".

Pragurile, cu sursa:
- „ultimele 2 swing low-uri importante" + „60 de candele in spate si minim 5
  candele intre divergente": `09_QA/24_2025-07-15.md:151-155`;
- „Daca aveti pe 3 candele divergenta, nu e": `09_QA/23_2025-07-29.md:873-874`;
- mecanismul pret-vs-volum (lower low pe pret, higher low pe indicator):
  `09_QA/19_2025-09-08.md:168-177`;
- perechea de low-uri se muta pe masura ce apare un low nou, mai jos:
  `09_QA/24_2025-07-15.md:159-162`.

Ruleaza:  .venv/bin/python gen/strategii/mdsrt_masurare.py
          -> gen/strategii/mdsrt_masurare.svg
"""
from pathlib import Path
from xml.sax.saxutils import escape

OUT = Path(__file__).with_suffix(".svg")

W, H = 700, 620
BLACK, GRAY, RED, GREEN, BLUE, ORANGE, WHITE = (
    "#000000", "#777777", "#c00", "#188a3e", "#1a5fb4", "#b06000", "#ffffff")

# ---- grila de timp: un pas = o candela. L2 e la 60 de pasi de la marginea
# stanga a panoului, ca bracket-ul „maxim 60 de candele" sa aiba exact 60 de
# pasi spre stanga si sa acopere si L1.
X0, STEPW = 60.0, 7.0
L1_STEP, L2_STEP, L3_STEP = 54.0, 60.0, 62.5
X_L1, X_L2, X_L3 = X0 + L1_STEP * STEPW, X0 + L2_STEP * STEPW, X0 + L3_STEP * STEPW

# ---- coordonatele verticale ale punctelor
Y_L1, Y_L2, Y_L3 = 252.0, 278.0, 272.0     # pret: L2 mai jos (lower low)
Y_I1, Y_I2 = 486.0, 468.0                  # indicator: I2 mai sus (higher low)

PRICE_BOX = (40.0, 76.0, 620.0, 250.0)     # y 76 .. 326
IND_BOX = (40.0, 344.0, 620.0, 200.0)      # y 344 .. 544

BR60_Y = 134.0          # bracket-ul de 60 de candele, sus
BR5_Y = 300.0           # bracket-ul de 5 candele, sub cele doua low-uri

TEXTS = []  # (x, y, text, size, weight, anchor) pentru verificarea finala


def txt(x, y, s, size=13, weight="400", fill=BLACK, anchor="middle"):
    TEXTS.append((x, y, s, size, weight, anchor))
    return (f'<text x="{x:.1f}" y="{y:.1f}" font-size="{size}" '
            f'font-weight="{weight}" fill="{fill}" text-anchor="{anchor}">'
            f'{escape(s)}</text>')


def line(x1, y1, x2, y2, stroke=BLACK, width=1.4, dash=None):
    d = f' stroke-dasharray="{dash}"' if dash else ""
    return (f'<line x1="{x1:.1f}" y1="{y1:.1f}" x2="{x2:.1f}" y2="{y2:.1f}" '
            f'stroke="{stroke}" stroke-width="{width}"{d}/>')


def poly(points, stroke=BLACK, width=1.8):
    pts = " ".join(f"{x:.1f},{y:.1f}" for x, y in points)
    return (f'<polyline points="{pts}" fill="none" stroke="{stroke}" '
            f'stroke-width="{width}" stroke-linejoin="round"/>')


def dot(x, y, color=BLACK, r=3.6):
    return f'<circle cx="{x:.1f}" cy="{y:.1f}" r="{r}" fill="{color}"/>'


def hbracket(x0, x1, y, color, tick=7.0):
    """Bracket orizontal de dimensiune: linie + capete verticale."""
    return [
        line(x0, y, x1, y, color, 1.4),
        line(x0, y - tick, x0, y + tick, color, 1.4),
        line(x1, y - tick, x1, y + tick, color, 1.4),
    ]


def cross(cx, cy, color=RED, arm=10.0):
    """Crucea rosie care marcheaza al treilea low (NU e divergenta)."""
    return [
        line(cx - arm, cy - arm, cx + arm, cy + arm, color, 2.0),
        line(cx - arm, cy + arm, cx + arm, cy - arm, color, 2.0),
    ]


def build():
    p = [
        f'<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 {W} {H}" '
        f'width="{W}" height="{H}" role="img" '
        f'aria-label="Cum se masoara divergenta: pretul face un lower low (L2 sub '
        f'L1), indicatorul face un higher low (I2 peste I1); intre L1 si L2 trebuie '
        f'minim 5 candele si cel mult 60 in spate, iar un low la 2-3 candele nu '
        f'conteaza">',
        '<g font-family="system-ui, sans-serif">',
        f'<rect x="0" y="0" width="{W}" height="{H}" fill="{WHITE}"/>',
        txt(W / 2, 34, "Divergența: cum o măsori corect", 19, "700", BLACK),
        txt(W / 2, 58, "Aceeași structură pe preț și pe indicator: două swing "
                       "low-uri, două minime", 13, "400", GRAY),
    ]

    # ---------------- panoul de sus: pretul
    bx, by, bw, bh = PRICE_BOX
    p.append(f'<rect x="{bx}" y="{by}" width="{bw}" height="{bh}" rx="8" '
             f'fill="{WHITE}" stroke="{GRAY}" stroke-width="1.2"/>')
    p.append(txt(bx + 16, by + 20, "PREȚ (schematic) — downtrend, lower low",
                 14, "700", BLACK, "start"))

    # bracket „maxim 60 de candele in spate": de la L2 spre stanga, 60 de pasi
    x60_left, x60_right = X0, X_L2
    p.extend(hbracket(x60_left, x60_right, BR60_Y, BLACK))
    p.append(txt((x60_left + x60_right) / 2, BR60_Y - 12,
                 "maxim 60 de candele în spate", 13, "400", BLACK))

    # linia pretului: downtrend cu L1, apoi L2 mai jos, apoi un low mic L3
    price = [(0, 158), (6, 178), (12, 166), (18, 192), (24, 180), (30, 206),
             (36, 194), (42, 218), (48, 232), (L1_STEP, Y_L1), (57, 226),
             (L2_STEP, Y_L2), (61.3, 248), (L3_STEP, Y_L3), (65, 250)]
    p.append(poly([(X0 + s * STEPW, y) for s, y in price], BLACK, 1.8))
    p.extend([dot(X_L1, Y_L1, BLACK), dot(X_L2, Y_L2, BLACK), dot(X_L3, Y_L3, BLACK)])
    p.append(txt(X_L1 - 10, Y_L1 + 6, "L1", 13, "700", BLACK, "end"))
    p.append(txt(X_L2 - 12, Y_L2 + 8, "L2", 13, "700", BLACK, "end"))

    # bracket „minim 5 candele intre puncte": intre L1 si L2
    p.extend(hbracket(X_L1, X_L2, BR5_Y, BLACK))
    p.append(txt((X_L1 + X_L2) / 2, BR5_Y + 18,
                 "minim 5 candele între puncte", 13, "400", BLACK))

    # al treilea low: cruce rosie + „NU" + eticheta
    p.extend(cross(X_L3, Y_L3, RED, arm=10.0))
    p.append(txt(X_L3, 234, "NU", 14, "700", RED))
    p.append(txt(525, 246, "2-3 candele", 13, "700", RED, "start"))
    p.append(txt(525, 266, "NU e divergență", 13, "700", RED, "start"))

    # ---------------- panoul de jos: indicatorul
    bx, by, bw, bh = IND_BOX
    p.append(f'<rect x="{bx}" y="{by}" width="{bw}" height="{bh}" rx="8" '
             f'fill="{WHITE}" stroke="{GRAY}" stroke-width="1.2"/>')
    p.append(txt(bx + 16, by + 20,
                 "INDICATOR (Power / volum / RS) — higher low",
                 14, "700", BLUE, "start"))

    ind = [(0, 400), (6, 424), (12, 410), (18, 436), (24, 422), (30, 448),
           (36, 434), (42, 458), (48, 466), (L1_STEP, Y_I1), (57, 458),
           (L2_STEP, Y_I2), (65, 440)]
    p.append(poly([(X0 + s * STEPW, y) for s, y in ind], BLUE, 1.8))
    p.extend([dot(X_L1, Y_I1, BLUE), dot(X_L2, Y_I2, BLUE)])
    p.append(txt(X_L1 - 10, Y_I1 + 6, "I1", 13, "700", BLUE, "end"))
    p.append(txt(X_L2 + 10, Y_I2 + 6, "I2", 13, "700", BLUE, "start"))

    # ---------------- legenda de jos
    p.append(txt(W / 2, 570, "Prețul face un lower low (L2 sub L1), indicatorul "
                             "face un higher low (I2 peste I1):", 13, "400", BLACK))
    p.append(txt(W / 2, 590, "divergență bull. Dar dacă al doilea punct e la "
                             "doar 2-3 candele, nu se numără.", 13, "400", BLACK))

    p.append('</g></svg>')
    return "\n".join(p) + "\n"


# ---------------------------------------------------------------- verificare
def est_w(s, size, weight):
    factor = 0.62 if weight == "700" else 0.56
    return len(s) * size * factor


def verify(svg):
    # (1) geometria schemei, exact ce cere spec-ul
    assert Y_L2 > Y_L1, "L2 trebuie desenat mai jos decat L1 (lower low)"
    assert Y_I2 < Y_I1, "I2 trebuie desenat mai sus decat I1 (higher low)"

    step_l1_l2 = (X_L2 - X_L1) / STEPW
    step_l2_l3 = (X_L3 - X_L2) / STEPW
    assert step_l1_l2 >= 5.0 - 1e-9, f"prea putine candele L1-L2: {step_l1_l2}"
    assert 2.0 - 1e-9 <= step_l2_l3 <= 3.0 + 1e-9, f"L3 nu e la 2-3 pasi: {step_l2_l3}"

    # (4) bracket-ul de 60 de candele acopera de la L2 spre stanga si trece de L1
    x60_left, x60_right = X0, X_L2
    assert x60_right == X_L2, "bracket-ul de 60 porneste din L2"
    assert x60_left <= X_L1, "bracket-ul de 60 nu ajunge pana la L1"
    assert x60_right - x60_left >= (X_L2 - X_L1), "bracket prea scurt fata de L1"
    assert (x60_right - x60_left) / STEPW == 60.0, "nu sunt exact 60 de pasi"

    # (5) „NU" si crucea rosie chiar pe al treilea low
    assert "NU" in svg
    assert RED in svg and "L3" not in svg  # L3 e marcat doar prin cruce, nu cu eticheta
    cross_lines = cross(X_L3, Y_L3)
    for ln in cross_lines:
        assert f'x1="{X_L3 - 10:.1f}"' in ln or f'x2="{X_L3 - 10:.1f}"' in ln
        assert f'y1="{Y_L3 - 10:.1f}"' in ln or f'y2="{Y_L3 - 10:.1f}"' in ln

    # etichetele obligatorii din spec sunt in desen
    for cheie in ("maxim 60 de candele în spate", "minim 5 candele între puncte",
                  "2-3 candele", "NU e divergență", "lower low", "higher low",
                  "L1", "L2", "I1", "I2"):
        assert cheie in svg, f"lipsește din desen: {cheie!r}"

    # (2) toate etichetele in panza
    for x, y, s, size, weight, anchor in TEXTS:
        ew = est_w(s, size, weight)
        left = x - ew if anchor == "end" else (x - ew / 2 if anchor == "middle" else x)
        right = left + ew
        assert -2 <= left and right <= W + 2, f"text in afara panzei: {s!r}"
        assert 0 <= y <= H, f"text in afara inaltimii: {s!r} (y={y})"

    # (3) fara doua texte pe aceeasi pozitie
    for i in range(len(TEXTS)):
        xi, yi, si, szi, wi, ai = TEXTS[i]
        we = est_w(si, szi, wi)
        li = xi - we if ai == "end" else (xi - we / 2 if ai == "middle" else xi)
        ri = li + we
        for j in range(i + 1, len(TEXTS)):
            xj, yj, sj, szj, wj, aj = TEXTS[j]
            wej = est_w(sj, szj, wj)
            lj = xj - wej if aj == "end" else (xj - wej / 2 if aj == "middle" else xj)
            rj = lj + wej
            if abs(yi - yj) < 13 and li < rj - 4 and lj < ri - 4:
                raise AssertionError(f"texte suprapuse: {si!r} / {sj!r}")

    # etichetele panourilor incap in panouri
    for x, y, s, size, weight, anchor in TEXTS:
        for (px, py, pw, ph) in (PRICE_BOX, IND_BOX):
            if py <= y <= py + ph and px - 2 <= x <= px + pw + 2:
                assert x >= px + 12, f"eticheta lipita de margine: {s!r}"
                assert est_w(s, size, weight) <= pw - 24, f"prea lata in panou: {s!r}"

    # fara linie goala in SVG
    assert "" not in svg.split("\n")[:-1], "SVG-ul are linie goala"
    assert "\n\n" not in svg, "SVG-ul are linie goala"
    return True


SVG = build()
assert verify(SVG), "verificare esuata"
OUT.write_text(SVG, encoding="utf-8")
print(f"scris {OUT} ({W}x{H}), verificare OK: {len(TEXTS)} etichete, "
      f"L1-L2={(X_L2 - X_L1) / STEPW:.1f} pasi, "
      f"L2-L3={(X_L3 - X_L2) / STEPW:.1f} pasi, "
      f"fereastra 60 = {(X_L2 - X0) / STEPW:.0f} pasi")