"""End-to-end test of the P-touch print pipeline (no hardware required).

Exercises config persistence, PDF generation, the "PDF" pseudo-printer path, and
variable-length QR payloads, then verifies the output dimensions.

IMPORTANT: this test writes to a temporary config file. It must never call
save_config() with the default path, because that overwrites the operator's real
settings in label_config.json.
"""

import os
import sys
import tempfile

sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
os.chdir(os.path.dirname(os.path.abspath(__file__)))

from PIL import Image, ImageDraw
from reportlab.lib.units import mm
from pypdf import PdfReader

import label_config
from print_label import print_ptouch_label
from ptouch_label import LabelConfig, PtouchLabelRenderer, code_density_warning

#: Isolated directory for config written by this test.
TEMP_DIR = tempfile.mkdtemp(prefix="ptouch_test_")


def make_test_logo(path):
    """Create a greyscale logo with transparency to exercise the flatten path."""
    img = Image.new("RGBA", (400, 400), (255, 255, 255, 0))
    draw = ImageDraw.Draw(img)
    draw.ellipse((20, 20, 380, 380), fill=(0, 0, 0, 255))
    draw.rectangle((150, 150, 250, 250), fill=(255, 255, 255, 255))
    img.save(path)
    return path


def main():
    base = os.path.dirname(os.path.abspath(__file__))
    logo_path = os.path.join(TEMP_DIR, "test_logo.png")
    make_test_logo(logo_path)

    cfg = LabelConfig()
    cfg.logo_path = logo_path
    cfg.static_lines = ["MOTO ADV SRL", "Articol: CABLU", "Rev: 2026-09"]
    cfg.qr_prefix = "INV-"
    cfg.qr_suffix = "-A"
    cfg.qr_error_correction = "M"

    print("=" * 68)
    print("1. Config persistence round-trip (in a temp dir, real config untouched)")
    real_cfg_path = label_config.config_path()
    real_before = open(real_cfg_path).read() if os.path.exists(real_cfg_path) else None

    path = label_config.save_config(cfg, base_dir=TEMP_DIR)
    reloaded = label_config.load_config(base_dir=TEMP_DIR)
    print(f"   saved to      : {path}")
    print(f"   logo preserved: {reloaded.logo_path == cfg.logo_path}")
    print(f"   lines preserved: {reloaded.static_lines == cfg.static_lines}")
    print(f"   prefix/suffix kept: "
          f"{reloaded.qr_prefix == cfg.qr_prefix and reloaded.qr_suffix == cfg.qr_suffix}")
    composed = reloaded.build_code_payload("1234")
    print(f"   composed payload : {composed!r}  "
          f"{'PASS' if composed == 'INV-1234-A' else 'FAIL'}")

    real_after = open(real_cfg_path).read() if os.path.exists(real_cfg_path) else None
    untouched = real_before == real_after
    print(f"   real config untouched: {'PASS' if untouched else 'FAIL'}")

    print("\n2. Unknown/corrupt keys are tolerated")
    weird = LabelConfig.from_dict({"static_lines": "not-a-list", "bogus_key": 1})
    print(f"   static_lines fell back: {weird.static_lines == LabelConfig().static_lines}")

    print("\n3. Print pipeline via the 'PDF' pseudo-printer")
    success, pdf_path, warning = print_ptouch_label("INV-00042", "PDF", cfg)
    print(f"   success       : {success}")
    print(f"   pdf           : {pdf_path}")
    print(f"   warning       : {warning or 'none'}")

    page = PdfReader(pdf_path).pages[0]
    w_mm = float(page.mediabox.width) / mm
    h_mm = float(page.mediabox.height) / mm
    # With match_driver_media the page is the driver's media size and the label
    # content is centred inside it; otherwise page size == content size.
    want_w, want_h = cfg.page_size_mm
    exact = abs(w_mm - want_w) < 0.01 and abs(h_mm - want_h) < 0.01
    print(f"   page size     : {w_mm:.2f} x {h_mm:.2f} mm  {'PASS' if exact else 'FAIL'}")
    print(f"   label content : {cfg.page_width_mm:.1f} x {cfg.page_height_mm:.1f} mm "
          f"at origin {cfg.origin_mm}")

    print("\n4. QR payload scaling with the inventory value")
    renderer = PtouchLabelRenderer(cfg)
    for value in ["A", "INV-00042", "MOTO-2026-0001234567"]:
        bitmap = renderer.code_bitmap(value)
        warn = code_density_warning(cfg, value)
        payload = cfg.build_code_payload(value)
        print(
            f"   {value:<22} modules={bitmap.modules:>3} "
            f"size={bitmap.width_mm:5.2f}mm dots/mod={bitmap.dots_per_module:.1f} "
            f"{'OK' if not warn else 'WARN'}"
        )
        print(f"      payload: {payload!r}")
        if warn:
            print(f"      -> {warn}")

    print("\n5. Oversized payload is reported, not silently misprinted")
    huge = "X" * 300
    warn = code_density_warning(cfg, huge)
    print(f"   warning present: {warn is not None}")
    print(f"   -> {warn}")

    print("\n6. Preview render (what the GUI shows)")
    preview = renderer.render_preview("INV-00042", dpi=300)
    print(f"   preview size  : {preview.size} px @300dpi")
    preview.save(os.path.join(base, "test_ptouch_preview.png"))
    print(f"   saved         : test_ptouch_preview.png")

    # Tidy up the test artifacts
    for temp in (logo_path, pdf_path):
        try:
            if os.path.exists(temp):
                os.remove(temp)
        except OSError:
            pass

    print("\n" + "=" * 68)
    passed = exact and success and untouched
    print("RESULT:", "PASS" if passed else "FAIL")
    return 0 if passed else 1


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