"""`dwg_review.tiling` 单元测试（纯函数，不依赖 CAD / LLM / Pillow）。"""

from dwg_review import tiling as tl


def _frame(bbox, sheet_size="A0", sheet_scale=0.0):
    return {"bbox": list(bbox), "sheet_size": sheet_size, "sheet_scale": sheet_scale}


def _cluster(bbox, count=10):
    return {"bbox": tuple(float(v) for v in bbox), "cells": [], "count": count}


# --- norm_box / frame_bbox --------------------------------------------------

def test_norm_box_valid_and_invalid():
    assert tl.norm_box([0, 0, 10, 20]) == (0.0, 0.0, 10.0, 20.0)
    assert tl.norm_box([10, 20, 0, 0]) == (0.0, 0.0, 10.0, 20.0)
    assert tl.norm_box([1, 2, 3]) is None
    assert tl.norm_box(None) is None
    assert tl.norm_box([0, 0, float("nan"), 1]) is None


def test_frame_bbox_rejects_degenerate_and_non_dict():
    assert tl.frame_bbox(_frame((0, 0, 100, 50))) == (0.0, 0.0, 100.0, 50.0)
    assert tl.frame_bbox(_frame((0, 0, 0, 50))) is None   # 零宽
    assert tl.frame_bbox(_frame((0, 0, 100, 0))) is None   # 零高
    assert tl.frame_bbox({"bbox": [1, 2, 3]}) is None
    assert tl.frame_bbox(None) is None


def test_frame_world_size():
    assert tl.frame_world_size(_frame((0, 0, 100, 50))) == (100.0, 50.0)
    assert tl.frame_world_size(_frame((0, 0, 0, 0))) == (0.0, 0.0)


# --- frame_scale：三条路径 --------------------------------------------------

def test_frame_scale_prefers_sheet_scale():
    assert tl.frame_scale(_frame((0, 0, 100, 50), sheet_scale=100.0)) == 100.0


def test_frame_scale_derived_landscape():
    # A0 横放：世界 118900 x 84100 → 118900/1189 = 100
    f = _frame((0, 0, 118900, 84100), sheet_size="A0")
    assert tl.frame_scale(f) == 100.0


def test_frame_scale_derived_portrait():
    # A0 纵放：世界宽 ↔ 纸高 841
    f = _frame((0, 0, 84100, 118900), sheet_size="A0")
    assert tl.frame_scale(f) == 100.0


def test_frame_scale_falls_back_to_default():
    assert tl.frame_scale(_frame((0, 0, 100, 50), sheet_size="ZZ"), default=7.0) == 7.0
    assert tl.frame_scale(_frame((0, 0, 0, 0)), default=7.0) == 7.0
    assert tl.frame_scale(None, default=7.0) == 7.0


# --- effective_px / world_per_px -------------------------------------------

def test_effective_px_no_resize_when_small():
    assert tl.effective_px((800, 600), 1280) == (800, 600)


def test_effective_px_downsamples_long_edge():
    # 实测 CAD 绘图区 2110x462 → 长边缩到 1280
    assert tl.effective_px((2110, 462), 1280) == (1280, 280)


def test_effective_px_invalid():
    assert tl.effective_px(None, 1280) == (0, 0)
    assert tl.effective_px((0, 100), 1280) == (0, 0)
    assert tl.effective_px((100, 100), 0) == (100, 100)  # 0 = 不缩放


def test_world_per_px():
    # 1:100、纸面 2mm、VLM 需 10px → 每像素 20 图形单位
    assert tl.world_per_px(100.0, 2.0, 10.0) == 20.0
    assert tl.world_per_px(0, 2.0, 10.0) == 0.0
    assert tl.world_per_px(100.0, 2.0, 0) == 0.0


# --- is_text_type -----------------------------------------------------------

def test_is_text_type_standard():
    for t in ("TEXT", "MTEXT", "ATTRIB", "ATTDEF", "DIMENSION", "text"):
        assert tl.is_text_type(t) is True


def test_is_text_type_custom_keywords():
    for t in ("AECDLABEL", "AECDDIMTEXT", "MYNOTE", "PARTTAG", "ANNOTATION", "TITLEBLK"):
        assert tl.is_text_type(t) is True


def test_is_text_type_negative():
    for t in ("AECDBEWPIPE", "LINE", "LWPOLYLINE", "INSERT", "HATCH", "", None, 123):
        assert tl.is_text_type(t) is False


# --- 相交 / 文字簇标记 -------------------------------------------------------

def test_boxes_intersect():
    assert tl.boxes_intersect((0, 0, 10, 10), (5, 5, 15, 15)) is True
    assert tl.boxes_intersect((0, 0, 10, 10), (10, 10, 20, 20)) is True  # 接触算相交
    assert tl.boxes_intersect((0, 0, 10, 10), (11, 11, 20, 20)) is False
    assert tl.boxes_intersect(None, (0, 0, 1, 1)) is False


def test_cluster_text_flags():
    clusters = [_cluster((0, 0, 10, 10)), _cluster((100, 100, 110, 110))]
    flags = tl.cluster_text_flags(clusters, [(5, 5, 6, 6)])
    assert flags == [True, False]
    assert tl.cluster_text_flags(clusters, []) == [False, False]
    assert tl.cluster_text_flags([], [(0, 0, 1, 1)]) == []


# --- tiles_for_box / subdivide ---------------------------------------------

def test_tiles_for_box_fits_single():
    assert tl.tiles_for_box((0, 0, 1000, 500), 1000, 500) == (1, 1)


def test_tiles_for_box_dense():
    assert tl.tiles_for_box((0, 0, 2000, 1000), 1000, 500) == (2, 2)


def test_tiles_for_box_overlap_increases_count():
    assert tl.tiles_for_box((0, 0, 1000, 500), 1000, 500, overlap=0.1) == (2, 2)


def test_tiles_for_box_invalid():
    assert tl.tiles_for_box(None, 10, 10) == (1, 1)
    assert tl.tiles_for_box((0, 0, 0, 0), 10, 10) == (1, 1)
    assert tl.tiles_for_box((0, 0, 10, 10), 0, 10) == (1, 1)


def test_subdivide_row_major_top_first():
    wins = tl.subdivide((0, 0, 100, 100), 2, 2)
    assert len(wins) == 4
    assert wins[0] == {"min_x": 0.0, "min_y": 50.0, "max_x": 50.0, "max_y": 100.0}
    assert wins[1] == {"min_x": 50.0, "min_y": 50.0, "max_x": 100.0, "max_y": 100.0}
    assert wins[2] == {"min_x": 0.0, "min_y": 0.0, "max_x": 50.0, "max_y": 50.0}
    assert wins[3] == {"min_x": 50.0, "min_y": 0.0, "max_x": 100.0, "max_y": 50.0}


def test_subdivide_overlap_expands_then_clamps():
    wins = tl.subdivide((0, 0, 100, 100), 2, 2, overlap=0.1, frame_win=(0, 0, 100, 100))
    # 每格 50x50，外扩 5 → 左上格：x 0..55（左被夹到 0），y 45..100（上被夹到 100）
    assert wins[0] == {"min_x": 0.0, "min_y": 45.0, "max_x": 55.0, "max_y": 100.0}


# --- plan_regions -----------------------------------------------------------

def test_plan_regions_sparse_single_tile():
    frame = _frame((0, 0, 1000, 500))
    clusters = [_cluster((100, 100, 400, 300))]
    wins = tl.plan_regions(frame, clusters, s_line=10.0, view_px=(100, 50))
    assert len(wins) == 1
    assert wins[0]["min_x"] <= 100 and wins[0]["max_x"] >= 400


def test_plan_regions_dense_splits():
    frame = _frame((0, 0, 2000, 1000))
    clusters = [_cluster((0, 0, 2000, 1000))]
    wins = tl.plan_regions(frame, clusters, s_line=10.0, view_px=(100, 50))
    assert len(wins) == 4  # 2x2


def test_plan_regions_text_uses_finer_scale():
    frame = _frame((0, 0, 1000, 500))
    clusters = [_cluster((0, 0, 1000, 500))]
    line_only = tl.plan_regions(frame, clusters, s_line=10.0, view_px=(100, 50))
    text = tl.plan_regions(frame, clusters, text_clusters={0}, s_text=5.0,
                           s_line=10.0, view_px=(100, 50))
    assert len(line_only) == 1
    assert len(text) == 4  # 半径减半 → 2x2


def test_plan_regions_text_cluster_prioritized_on_truncation():
    frame = _frame((0, 0, 4000, 2000))
    clusters = [_cluster((0, 0, 2000, 1000), count=99),   # 非文字，排前面（输入序）
                _cluster((2000, 1000, 4000, 2000), count=1)]  # 文字
    wins = tl.plan_regions(frame, clusters, text_clusters={1},
                           s_text=10.0, s_line=10.0, view_px=(100, 50), max_tiles=2)
    assert len(wins) == 2
    # 文字簇（下标 1，位于右上）应优先出图
    assert wins[0]["min_x"] >= 2000 and wins[0]["min_y"] >= 1000


def test_plan_regions_degrades():
    frame = _frame((0, 0, 1000, 500))
    clusters = [_cluster((0, 0, 1000, 500))]
    assert tl.plan_regions(frame, clusters, s_line=0.0, view_px=(100, 50)) == []
    assert tl.plan_regions(frame, clusters, s_line=10.0, view_px=(0, 0)) == []
    assert tl.plan_regions({"bbox": [0, 0, 0, 0]}, clusters, s_line=10.0,
                           view_px=(100, 50)) == []
    assert tl.plan_regions(frame, [], s_line=10.0, view_px=(100, 50)) == []


def test_plan_regions_clamps_to_frame():
    frame = _frame((0, 0, 1000, 500))
    clusters = [_cluster((0, 0, 2000, 1000))]  # 超出图框
    wins = tl.plan_regions(frame, clusters, s_line=10.0, view_px=(100, 50), max_tiles=4)
    for w in wins:
        assert w["min_x"] >= 0 and w["max_x"] <= 1000
        assert w["min_y"] >= 0 and w["max_y"] <= 500