from __future__ import annotations

"""
Local elixir reading using OCR + bar fill (fallback).

Designed for BlueStacks screenshot produced by scripts/bluestacks_screenshot.sh.

Dependencies:
- Pillow (already used elsewhere)
- Optional: tesseract + pytesseract for best results
  - brew install tesseract
  - python3 -m pip install pytesseract

Usage:
  cd toxic_royale_env
  python3 scripts/bluestacks_elixir_ocr.py --image outputs/bluestacks/pilot_current.png

Debug:
  BS_DEBUG_ELIXIR=1 python3 scripts/bluestacks_elixir_ocr.py --image ...
  -> writes outputs/bluestacks/debug_elixir_ocr_roi.png and debug_elixir_bar_roi.png
"""

import argparse
import json
import os
import subprocess
from pathlib import Path

from PIL import Image, ImageOps, ImageFilter


def _load_cfg(root: Path) -> dict:
    cfg_path = root / "config" / "bluestacks_gameplay.local.json"
    return json.loads(cfg_path.read_text(encoding="utf-8"))


def _bluestacks_bounds() -> tuple[int, int, int, int] | None:
    """
    Return (x,y,w,h) of the exact region captured by scripts/bluestacks_screenshot.sh.
    This lets us convert absolute screen calibration coords -> screenshot pixel coords.
    """
    script = r'''
      tell application "System Events"
        try
          set bluestacksProc to application process "BlueStacks"
          set allWins to every window of bluestacksProc
          repeat with w in allWins
            set t to title of w
            set n to name of w
            set sr to subrole of w
            set s to size of w
            set p to position of w
            if (t is "BlueStacks Air" or n is "BlueStacks Air") and sr is "AXDialog" then
              set x to item 1 of p
              set y to item 2 of p
              set w_ to item 1 of s
              set h to item 2 of s
              if h > 200 then
                return "" & x & "," & y & "," & w_ & "," & h
              end if
            end if
          end repeat
          return ""
        on error
          return ""
        end try
      end tell
    '''
    try:
        out = subprocess.check_output(["osascript", "-e", script], text=True).strip()
        if not out or out.count(",") < 3:
            return None
        x_s, y_s, w_s, h_s = out.split(",", 3)
        return int(float(x_s)), int(float(y_s)), int(float(w_s)), int(float(h_s))
    except Exception:
        return None


def _crop_elixir_number_roi(im: Image.Image, *, x_left: int, y: int) -> Image.Image:
    """
    Crop ROI around the big elixir number (white).

    Important: BlueStacks UI is consistent inside the cropped screenshot, and calibration y can drift.
    We therefore default to a RELATIVE crop (percentage of image size) which is robust.
    """
    w, h = im.size

    # Relative ROI covering the big elixir number + "Max: 10" baseline.
    # Tuned against typical BlueStacks Air layout (and avoids the hand card costs).
    # Default to a bar-anchored crop (more stable than a pure relative crop).
    # The big number sits ABOVE the bar and slightly LEFT of the bar start.
    # Keep this fairly right-shifted to avoid the "Next:" label region.
    x0 = max(0, x_left - 170)
    x1 = max(0, min(w, x_left + 20))
    # Place the crop just above the bar, where the big elixir number sits.
    y0 = max(0, y - 175)
    y1 = max(0, min(h, y - 20))

    # If user wants to force calibration-based crop for experiments:
    if os.environ.get("BS_OCR_MODE", "").strip().lower() == "relative":
        # Relative ROI covering the elixir droplet region; useful if calibration is very wrong.
        x0 = int(round(0.36 * w))
        x1 = int(round(0.50 * w))
        y0 = int(round(0.85 * h))
        y1 = int(round(0.95 * h))

    x0 = max(0, min(w - 1, x0))
    x1 = max(x0 + 1, min(w, x1))
    y0 = max(0, min(h - 1, y0))
    y1 = max(y0 + 1, min(h, y1))
    return im.crop((x0, y0, x1, y1))


def _preprocess_for_ocr(roi: Image.Image) -> Image.Image:
    g = ImageOps.grayscale(roi)
    # Upscale so OCR has more pixels.
    g = g.resize((g.size[0] * 3, g.size[1] * 3), Image.Resampling.BICUBIC)
    # Sharpen edges a bit.
    g = g.filter(ImageFilter.UnsharpMask(radius=2, percent=180, threshold=2))
    # High contrast: white digits on darker background.
    g = ImageOps.autocontrast(g)
    # Binarize (slightly lower threshold; BlueStacks UI can be dim).
    g = g.point(lambda p: 255 if p > 140 else 0)
    return g


def _try_tesseract(roi_bin: Image.Image) -> int | None:
    try:
        import pytesseract  # type: ignore
    except Exception:
        return None

    try:
        txt = pytesseract.image_to_string(
            roi_bin,
            config="--psm 7 -c tessedit_char_whitelist=0123456789",
        ).strip()
    except Exception:
        return None

    # Extract first integer-like token
    digits = "".join(ch for ch in txt if ch.isdigit())
    if not digits:
        return None
    try:
        v = int(digits)
    except Exception:
        return None
    if 0 <= v <= 10:
        return v
    return None


def _estimate_from_bar(im: Image.Image, *, x0: int, x1: int, y: int) -> float | None:
    """
    Estimate elixir 0..10 from bar fill (left->right length).

    Uses HSV scoring + adaptive threshold and searches nearby y positions to
    avoid sampling the wrong scanline (Retina + UI glow).
    """
    w, h = im.size
    x0 = max(0, min(w - 2, x0))
    x1 = max(x0 + 1, min(w, x1))

    import colorsys

    def magenta_score(r: int, g: int, b: int) -> float:
        rf, gf, bf = r / 255.0, g / 255.0, b / 255.0
        h_, s_, v_ = colorsys.rgb_to_hsv(rf, gf, bf)
        # magenta/purple hue band
        if 0.78 <= h_ <= 0.95 and s_ >= 0.25 and v_ >= 0.15:
            return s_ * v_
        return 0.0

    best_fill = 0.0
    best_roi = None

    # scan a few y offsets around calibrated y
    for dy in range(-24, 25, 2):
        yy = max(0, min(h - 16, y + dy))
        roi = im.crop((x0, yy, x1, yy + 12)).convert("RGB")
        px = roi.load()

        cols = roi.size[0]
        band = roi.size[1]
        scores: list[float] = []
        for cx in range(cols):
            ssum = 0.0
            for cy in range(band):
                r, g, b = px[cx, cy]
                ssum += magenta_score(r, g, b)
            scores.append(ssum / max(1, band))

        s_sorted = sorted(scores)
        p10 = s_sorted[int(0.10 * (len(s_sorted) - 1))]
        p90 = s_sorted[int(0.90 * (len(s_sorted) - 1))]
        if p90 <= 0.02:
            continue
        thr = (p10 + p90) / 2.0

        # find left-to-right fill run, allowing small gaps for tick marks
        filled_cols = 0
        miss_run = 0
        for v in scores:
            if v >= thr:
                filled_cols += 1
                miss_run = 0
            else:
                miss_run += 1
                if miss_run >= 10:
                    break

        fill = filled_cols / max(1, cols)
        if fill > best_fill:
            best_fill = fill
            best_roi = roi

    if os.environ.get("BS_DEBUG_ELIXIR", "0") == "1" and best_roi is not None:
        out_dir = Path(__file__).resolve().parents[1] / "outputs" / "bluestacks"
        out_dir.mkdir(parents=True, exist_ok=True)
        best_roi.save(out_dir / "debug_elixir_bar_roi.png")

    if best_fill <= 0.0:
        return None
    return round(10.0 * max(0.0, min(1.0, best_fill)), 1)


def read_elixir(image_path: Path) -> tuple[float | None, dict]:
    root = Path(__file__).resolve().parents[1]
    cfg = _load_cfg(root)
    eb = cfg.get("elixir_bar") or {}
    s = eb.get("start")
    e = eb.get("end")
    if not (s and e):
        return None, {"error": "missing_elixir_bar_calibration"}

    im = Image.open(image_path).convert("RGB")

    # Convert absolute screen coords -> screenshot coords using the BlueStacks window origin.
    b = _bluestacks_bounds()
    if b is None:
        return None, {"error": "cannot_find_bluestacks_bounds"}
    ox, oy, _w, _h = b

    # Retina scaling: screencapture produces pixel-dense images, while cliclick/AppleScript coords
    # are in logical screen points. Compute scale from captured image size vs window bounds.
    sx = im.size[0] / max(1.0, float(_w))
    sy = im.size[1] / max(1.0, float(_h))

    x0_pt, y_pt = int(s[0]) - ox, int(s[1]) - oy
    x1_pt, _y2_pt = int(e[0]) - ox, int(e[1]) - oy

    x0 = int(round(x0_pt * sx))
    y = int(round(y_pt * sy))
    x1 = int(round(x1_pt * sx))

    dbg_bounds = {
        "bounds": [ox, oy, _w, _h],
        "scale": [round(sx, 3), round(sy, 3)],
        "bar_start_xy_points": [x0_pt, y_pt],
        "bar_end_x_points": x1_pt,
        "bar_start_xy_px": [x0, y],
        "bar_end_x_px": x1,
    }

    if x1 < x0:
        x0, x1 = x1, x0

    # Optional: ROI calibration (screen coords) for number + bar.
    # If present (non-zero), use these boxes instead of derived ones.
    roi_cfg = cfg.get("elixir_roi") or {}
    num_tl = (roi_cfg.get("number") or {}).get("tl") or [0, 0]
    num_br = (roi_cfg.get("number") or {}).get("br") or [0, 0]
    bar_tl = (roi_cfg.get("bar") or {}).get("tl") or [0, 0]
    bar_br = (roi_cfg.get("bar") or {}).get("br") or [0, 0]

    def _nonzero(pt) -> bool:
        try:
            return int(pt[0]) != 0 or int(pt[1]) != 0
        except Exception:
            return False

    # Convert screen-ROI -> screenshot pixels (apply origin + scale)
    num_box = None
    if _nonzero(num_tl) and _nonzero(num_br):
        x0n = int(round((int(num_tl[0]) - ox) * sx))
        y0n = int(round((int(num_tl[1]) - oy) * sy))
        x1n = int(round((int(num_br[0]) - ox) * sx))
        y1n = int(round((int(num_br[1]) - oy) * sy))
        num_box = (min(x0n, x1n), min(y0n, y1n), max(x0n, x1n), max(y0n, y1n))

    bar_box = None
    if _nonzero(bar_tl) and _nonzero(bar_br):
        x0b = int(round((int(bar_tl[0]) - ox) * sx))
        y0b = int(round((int(bar_tl[1]) - oy) * sy))
        x1b = int(round((int(bar_br[0]) - ox) * sx))
        y1b = int(round((int(bar_br[1]) - oy) * sy))
        bar_box = (min(x0b, x1b), min(y0b, y1b), max(x0b, x1b), max(y0b, y1b))

    # 1) OCR number (best)
    if num_box is not None:
        roi_num = im.crop(num_box)
        roi_num_box = list(num_box)
    else:
        roi_num = _crop_elixir_number_roi(im, x_left=x0, y=y)
        roi_num_box = "auto"
    roi_bin = _preprocess_for_ocr(roi_num)
    v_int = _try_tesseract(roi_bin)

    # 2) Bar fill fallback
    if bar_box is not None:
        x0b, y0b, x1b, y1b = bar_box
        # use centerline y for scanning, but keep x range tight
        yb = int((y0b + y1b) / 2)
        v_bar = _estimate_from_bar(im, x0=x0b, x1=x1b, y=yb)
        bar_box_dbg = list(bar_box)
    else:
        v_bar = _estimate_from_bar(im, x0=x0, x1=x1, y=y)
        bar_box_dbg = "auto"

    dbg = {
        "ocr_int": v_int,
        "bar_est": v_bar,
        "roi_num_box": roi_num_box,
        "bar_box": bar_box_dbg,
        **dbg_bounds,
    }

    if os.environ.get("BS_DEBUG_ELIXIR", "0") == "1":
        out_dir = root / "outputs" / "bluestacks"
        out_dir.mkdir(parents=True, exist_ok=True)
        roi_bin.save(out_dir / "debug_elixir_ocr_roi.png")
        dbg["debug_dir"] = str(out_dir)

    if v_int is not None:
        return float(v_int), dbg
    if v_bar is not None:
        return float(v_bar), dbg
    return None, dbg


def main() -> int:
    ap = argparse.ArgumentParser()
    ap.add_argument("--image", type=str, required=True)
    args = ap.parse_args()
    v, dbg = read_elixir(Path(args.image))
    print(json.dumps({"elixir": v, "debug": dbg}, indent=2))
    return 0


if __name__ == "__main__":
    raise SystemExit(main())