"""交易复盘 / 订单 K 线拼图（Binance / Gate / OKX 共用）。"""

import math

try:
    from PIL import Image, ImageDraw, ImageFont
except ImportError:
    Image = None  # type: ignore
    ImageDraw = None  # type: ignore
    ImageFont = None  # type: ignore

JOURNAL_CHART_TF_CHOICES = ("1m", "3m", "5m", "15m", "30m", "1h", "2h", "4h", "6h", "12h", "1d")
JOURNAL_CHART_DEFAULT_TF1 = "15m"
JOURNAL_CHART_DEFAULT_TF2 = "1h"
JOURNAL_CHART_DEFAULT_LIMIT = 300
JOURNAL_CHART_LIMIT_MIN = 50
JOURNAL_CHART_LIMIT_MAX = 500


def _load_font(size):
    if not ImageFont:
        return None
    for name in ("msyh.ttc", "Microsoft YaHei.ttf", "arial.ttf", "Arial.ttf"):
        try:
            return ImageFont.truetype(name, size)
        except Exception:
            continue
    try:
        return ImageFont.load_default()
    except Exception:
        return None


def ohlcv_to_rows(ohlcv):
    rows = []
    for bar in ohlcv or []:
        if not bar or len(bar) < 6:
            continue
        try:
            rows.append(
                {
                    "ts": int(bar[0]),
                    "o": float(bar[1]),
                    "h": float(bar[2]),
                    "l": float(bar[3]),
                    "c": float(bar[4]),
                    "v": float(bar[5]),
                }
            )
        except Exception:
            continue
    return rows


def marker_tag_label(tag):
    t = str(tag or "").strip().upper()
    if t == "ENTRY":
        return "开仓"
    if t == "EXIT":
        return "平仓"
    if t == "STOP":
        return "止损"
    return str(tag or "")


def pick_marker_point(rows, target_ts_ms, target_price=None):
    if not rows or target_ts_ms is None:
        return None, None
    idx = min(range(len(rows)), key=lambda i: abs(int(rows[i]["ts"]) - int(target_ts_ms)))
    if target_price is not None:
        try:
            p = float(target_price)
            if p > 0:
                return idx, p
        except Exception:
            pass
    return idx, float(rows[idx]["c"])


def parse_positive_price(raw):
    if raw is None:
        return None
    s = str(raw).strip()
    if not s:
        return None
    try:
        p = float(s)
        return p if p > 0 else None
    except (TypeError, ValueError):
        return None


def parse_journal_chart_limit(raw, fallback=None):
    fb = int(fallback if fallback is not None else JOURNAL_CHART_DEFAULT_LIMIT)
    try:
        n = int(str(raw or "").strip() or fb)
    except (TypeError, ValueError):
        n = fb
    return max(JOURNAL_CHART_LIMIT_MIN, min(JOURNAL_CHART_LIMIT_MAX, n))


def normalize_chart_timeframe(raw):
    tf = str(raw or "").strip().lower()
    if tf in JOURNAL_CHART_TF_CHOICES:
        return tf
    return ""


def parse_journal_chart_timeframes(tf1, tf2, fallback_tfs=None):
    """复盘表单：最多两个周期，去重保序。"""
    out = []
    for raw in (tf1, tf2):
        tf = normalize_chart_timeframe(raw)
        if tf and tf not in out:
            out.append(tf)
    if out:
        return out[:2]
    fb = [normalize_chart_timeframe(x) for x in (fallback_tfs or (JOURNAL_CHART_DEFAULT_TF1, JOURNAL_CHART_DEFAULT_TF2))]
    fb = [x for x in fb if x]
    return fb[:2] if fb else [JOURNAL_CHART_DEFAULT_TF1, JOURNAL_CHART_DEFAULT_TF2]


def marker_points_for_timeframe(rows, marker_payload):
    points = []
    if not marker_payload or not rows:
        return points
    entry_idx, entry_price = pick_marker_point(
        rows, marker_payload.get("entry_ts_ms"), marker_payload.get("entry_price")
    )
    exit_idx, exit_price = pick_marker_point(
        rows, marker_payload.get("exit_ts_ms"), marker_payload.get("exit_price")
    )
    if entry_idx is not None and entry_price is not None:
        points.append({"idx": entry_idx, "price": entry_price, "tag": "ENTRY"})
    if exit_idx is not None and exit_price is not None:
        points.append({"idx": exit_idx, "price": exit_price, "tag": "EXIT"})
    return points


def price_levels_from_marker_payload(marker_payload):
    levels = []
    if not marker_payload:
        return levels
    sl = parse_positive_price(marker_payload.get("stop_loss_price"))
    if sl is not None:
        levels.append({"price": sl, "label": "止损", "color": (255, 152, 0)})
    return levels


def render_candles_subplot(
    rows,
    title,
    width,
    height,
    bg_rgb=(255, 255, 255),
    marker_points=None,
    price_levels=None,
):
    if not Image or not ImageDraw:
        raise RuntimeError("缺少依赖：Pillow（pip install Pillow）")
    img = Image.new("RGB", (width, height), bg_rgb)
    draw = ImageDraw.Draw(img)
    font = _load_font(14)
    small = _load_font(12)

    pad_l, pad_r, pad_t, pad_b = 46, 12, 26, 28
    plot_w = max(10, width - pad_l - pad_r)
    plot_h = max(10, height - pad_t - pad_b)

    header_bg = (245, 247, 250)
    draw.rectangle((0, 0, width, pad_t), fill=header_bg)
    if font:
        draw.text((10, 6), title, fill=(25, 35, 60), font=font)
    else:
        draw.text((10, 6), title, fill=(25, 35, 60))

    if not rows:
        if small:
            draw.text((pad_l, pad_t + 10), "无K线数据", fill=(90, 100, 120), font=small)
        else:
            draw.text((pad_l, pad_t + 10), "无K线数据", fill=(90, 100, 120))
        return img

    lo = min(r["l"] for r in rows)
    hi = max(r["h"] for r in rows)
    for pl in price_levels or []:
        try:
            p = float(pl.get("price"))
            if p > 0:
                lo = min(lo, p)
                hi = max(hi, p)
        except (TypeError, ValueError):
            pass
    if hi <= lo:
        hi = lo + 1e-12

    n = len(rows)
    marker_by_idx = {}
    for mp in marker_points or []:
        try:
            idx = int(mp.get("idx"))
        except Exception:
            continue
        if idx < 0 or idx >= n:
            continue
        marker_by_idx.setdefault(idx, []).append(mp)

    x0 = pad_l
    for i, r in enumerate(rows):
        x1 = pad_l + int((i + 1) * plot_w / n)
        x_mid = (x0 + x1) // 2
        wick_x = x_mid
        y_high = pad_t + int((hi - r["h"]) / (hi - lo) * plot_h)
        y_low = pad_t + int((hi - r["l"]) / (hi - lo) * plot_h)
        y_open = pad_t + int((hi - r["o"]) / (hi - lo) * plot_h)
        y_close = pad_t + int((hi - r["c"]) / (hi - lo) * plot_h)
        top = min(y_open, y_close)
        bot = max(y_open, y_close)
        up = r["c"] >= r["o"]
        wick_color = (120, 120, 120)
        edge_color = (20, 20, 20)
        draw.line((wick_x, y_high, wick_x, y_low), fill=wick_color)
        body_w = max(1, (x1 - x0) - 2)
        left = x0 + 1
        if bot - top < 2:
            mid = (top + bot) // 2
            draw.rectangle((left, mid, left + body_w, mid + 1), fill=edge_color)
        else:
            if up:
                draw.rectangle((left, top, left + body_w, bot), fill=(255, 255, 255), outline=edge_color, width=1)
            else:
                draw.rectangle((left, top, left + body_w, bot), fill=edge_color, outline=edge_color, width=1)
        for j, mp in enumerate(marker_by_idx.get(i, [])):
            tag = str(mp.get("tag") or "")
            label = marker_tag_label(tag)
            m_price = float(mp.get("price") or r["c"])
            y_m = pad_t + int((hi - m_price) / (hi - lo) * plot_h)
            y_m = max(pad_t + 4, min(pad_t + plot_h - 4, y_m))
            x_off = (j - (len(marker_by_idx[i]) - 1) / 2.0) * 14
            x_draw = int(x_mid + x_off)
            if tag == "ENTRY":
                m_color = (0, 195, 95)
                tri = [(x_draw, y_m - 20), (x_draw - 9, y_m - 4), (x_draw + 9, y_m - 4)]
                text_y = y_m - 36
            else:
                m_color = (235, 65, 65)
                tri = [(x_draw, y_m + 20), (x_draw - 9, y_m + 4), (x_draw + 9, y_m + 4)]
                text_y = y_m + 12
            draw.ellipse((x_draw - 5, y_m - 5, x_draw + 5, y_m + 5), fill=m_color, outline=(255, 255, 255), width=1)
            draw.polygon(tri, fill=m_color)
            draw.line((x_draw, y_m, x_draw, y_m - 16 if tag == "ENTRY" else y_m + 16), fill=m_color, width=3)
            if font:
                draw.text((x_draw + 8, text_y), label, fill=m_color, font=font)
            else:
                draw.text((x_draw + 8, text_y), label, fill=m_color)
        x0 = x1

    x_right = pad_l + plot_w
    for pl in price_levels or []:
        try:
            p = float(pl.get("price"))
        except (TypeError, ValueError):
            continue
        if p <= 0:
            continue
        y_sl = pad_t + int((hi - p) / (hi - lo) * plot_h)
        color = tuple(pl.get("color") or (255, 152, 0))
        label = str(pl.get("label") or "止损")
        for xx in range(pad_l, x_right, 10):
            draw.line((xx, y_sl, min(xx + 6, x_right), y_sl), fill=color, width=2)
        if font:
            draw.text((x_right - 72, y_sl - 18), label, fill=color, font=small or font)
        else:
            draw.text((x_right - 72, y_sl - 18), label, fill=color)

    if len(marker_points or []) >= 2:
        try:
            entry = next((m for m in marker_points if m.get("tag") == "ENTRY"), None)
            exitp = next((m for m in marker_points if m.get("tag") == "EXIT"), None)
            if entry is not None and exitp is not None:
                ex_i, ex_p = int(entry["idx"]), float(entry["price"])
                xx_i, xx_p = int(exitp["idx"]), float(exitp["price"])
                x_ex = pad_l + int((ex_i + 0.5) * plot_w / n)
                x_xx = pad_l + int((xx_i + 0.5) * plot_w / n)
                y_ex = pad_t + int((hi - ex_p) / (hi - lo) * plot_h)
                y_xx = pad_t + int((hi - xx_p) / (hi - lo) * plot_h)
                draw.line((x_ex, y_ex, x_xx, y_xx), fill=(35, 135, 255), width=3)
        except Exception:
            pass

    if small:
        draw.text((width - 210, height - 22), f"L={lo:.6g}  H={hi:.6g}", fill=(120, 125, 135), font=small)
    return img


def compose_chart_panels(panels, layout="grid", cell_w=980, cell_h=520, gap=10):
    if not panels or not Image:
        return None
    if layout == "vertical":
        cols = 1
        rows_n = len(panels)
    else:
        cols = 2
        rows_n = int(math.ceil(len(panels) / cols))
    w = cols * cell_w + (cols - 1) * gap
    h = rows_n * cell_h + (rows_n - 1) * gap
    out = Image.new("RGB", (w, h), (255, 255, 255))
    idx = 0
    for r in range(rows_n):
        for c in range(cols):
            if idx >= len(panels):
                break
            x = c * (cell_w + gap)
            y = r * (cell_h + gap)
            out.paste(panels[idx], (x, y))
            idx += 1

    if ImageDraw and layout != "vertical" and rows_n >= 1:
        draw_out = ImageDraw.Draw(out)
        line_col = (220, 225, 232)
        x_mid = cell_w + gap // 2
        if w > x_mid >= 0:
            draw_out.line((x_mid, 0, x_mid, h), fill=line_col, width=2)
        for rr in range(1, rows_n):
            y_mid = rr * cell_h + (rr - 1) * gap + gap // 2
            if 0 <= y_mid <= h:
                draw_out.line((0, y_mid, w, y_mid), fill=line_col, width=2)
    elif ImageDraw and layout == "vertical" and rows_n >= 2:
        draw_out = ImageDraw.Draw(out)
        line_col = (220, 225, 232)
        for rr in range(1, rows_n):
            y_mid = rr * cell_h + (rr - 1) * gap + gap // 2
            if 0 <= y_mid <= h:
                draw_out.line((0, y_mid, w, y_mid), fill=line_col, width=2)
    return out