"""贴纸引擎纯逻辑单元测试."""

from __future__ import annotations

import pytest
from video_processing.sticker_engine_pure import (
    build_drawtext_alpha_expr,
    build_enable_expr,
    build_image_fade_filters,
    build_opacity_filter,
    build_overlay_position,
    build_pre_filter_label,
    build_scale_filter,
    build_shadow_params,
    build_stroke_params,
    calculate_end_time,
    calculate_fade_out_start,
    count_sticker_types,
    escape_drawtext_text,
    estimate_sticker_size,
    estimate_text_size,
    filter_enabled_stickers,
    has_time_range,
    safe_bool,
    safe_float,
    safe_int,
    sort_stickers_by_z_index,
    validate_image_sticker,
    validate_text_sticker,
)

# ─────────────────────────────────────────────────────────────────────────────
# 安全类型转换测试
# ─────────────────────────────────────────────────────────────────────────────


class TestSafeFloat:
    """safe_float 测试."""

    def test_int_input(self):
        """整数输入."""
        assert safe_float(42) == 42.0

    def test_float_input(self):
        """浮点数输入."""
        assert safe_float(3.14) == 3.14

    def test_string_number(self):
        """字符串数字."""
        assert safe_float("3.14") == 3.14

    def test_string_int(self):
        """字符串整数."""
        assert safe_float("100") == 100.0

    def test_none_input(self):
        """None 输入."""
        assert safe_float(None) is None

    def test_invalid_string(self):
        """无效字符串."""
        assert safe_float("abc") is None

    def test_empty_string(self):
        """空字符串."""
        assert safe_float("") is None

    def test_zero(self):
        """零值."""
        assert safe_float(0) == 0.0

    def test_negative(self):
        """负值."""
        assert safe_float(-5.5) == -5.5


class TestSafeInt:
    """safe_int 测试."""

    def test_int_input(self):
        """整数输入."""
        assert safe_int(42) == 42

    def test_float_input(self):
        """浮点数输入（截断）."""
        assert safe_int(3.7) == 3

    def test_string_number(self):
        """字符串数字."""
        assert safe_int("42") == 42

    def test_none_input(self):
        """None 输入用默认值."""
        assert safe_int(None) == 0

    def test_none_custom_default(self):
        """None 输入自定义默认值."""
        assert safe_int(None, default=10) == 10

    def test_invalid_string(self):
        """无效字符串."""
        assert safe_int("abc") == 0

    def test_negative(self):
        """负值."""
        assert safe_int(-5) == -5

    def test_zero(self):
        """零值."""
        assert safe_int(0) == 0


class TestSafeBool:
    """safe_bool 测试."""

    def test_true_bool(self):
        """True."""
        assert safe_bool(True) is True

    def test_false_bool(self):
        """False."""
        assert safe_bool(False) is False

    def test_none(self):
        """None -> False."""
        assert safe_bool(None) is False

    def test_string_true(self):
        """字符串 true."""
        assert safe_bool("true") is True

    def test_string_yes(self):
        """字符串 yes."""
        assert safe_bool("yes") is True

    def test_string_one(self):
        """字符串 1."""
        assert safe_bool("1") is True

    def test_string_false(self):
        """字符串 false."""
        assert safe_bool("false") is False

    def test_int_one(self):
        """整数 1 -> True."""
        assert safe_bool(1) is True

    def test_int_zero(self):
        """整数 0 -> False."""
        assert safe_bool(0) is False

    def test_empty_list(self):
        """空列表 -> False."""
        assert safe_bool([]) is False


# ─────────────────────────────────────────────────────────────────────────────
# 尺寸估算测试
# ─────────────────────────────────────────────────────────────────────────────


class TestEstimateStickerSize:
    """贴纸尺寸估算测试."""

    def test_default_scale(self):
        """默认 scale=1.0."""
        w, h = estimate_sticker_size(1000, 1000)
        assert w == 300  # 1000 * 0.3 * 1.0
        assert h == 300

    def test_custom_scale(self):
        """自定义缩放."""
        w, h = estimate_sticker_size(1000, 1000, scale=0.5)
        assert w == 150
        assert h == 150

    def test_fixed_width_height(self):
        """固定宽高."""
        w, h = estimate_sticker_size(1000, 1000, fixed_width=200, fixed_height=100)
        assert w == 200
        assert h == 100

    def test_scale_2x(self):
        """2倍缩放."""
        w, h = estimate_sticker_size(800, 600, scale=2.0)
        assert w == 480  # 800 * 0.3 * 2
        assert h == 360  # 600 * 0.3 * 2

    def test_zero_canvas(self):
        """零画布尺寸，返回最小 1."""
        w, h = estimate_sticker_size(0, 0)
        assert w >= 1
        assert h >= 1


class TestEstimateTextSize:
    """文字尺寸估算测试."""

    def test_normal_text(self):
        """普通文字."""
        w, h = estimate_text_size("Hello", 36)
        assert w == int(5 * 36 * 0.6)
        assert h == int(36 * 1.4)

    def test_empty_text(self):
        """空文字."""
        w, h = estimate_text_size("", 36)
        assert w == 0
        assert h == 0

    def test_large_font(self):
        """大字号."""
        w, h = estimate_text_size("A", 72)
        assert w == int(1 * 72 * 0.6)
        assert h == int(72 * 1.4)

    def test_chinese_chars(self):
        """中文字符."""
        w, h = estimate_text_size("你好世界", 48)
        assert w == int(4 * 48 * 0.6)
        assert h == int(48 * 1.4)


# ─────────────────────────────────────────────────────────────────────────────
# 时间计算测试
# ─────────────────────────────────────────────────────────────────────────────


class TestCalculateFadeOutStart:
    """淡出开始时间计算测试."""

    def test_normal_case(self):
        """正常情况."""
        assert calculate_fade_out_start(10, 30, 2) == pytest.approx(38.0)

    def test_no_fade_out(self):
        """无淡出."""
        assert calculate_fade_out_start(10, 30, 0) == 0.0

    def test_negative_fade_out(self):
        """负淡出."""
        assert calculate_fade_out_start(10, 30, -1) == 0.0

    def test_zero_duration(self):
        """零时长."""
        assert calculate_fade_out_start(10, 0, 2) == 0.0

    def test_fade_out_longer_than_duration(self):
        """淡出超过时长，返回 0."""
        # start=10, dur=5, fade=10 -> 10+5-10 = 5 > 0
        assert calculate_fade_out_start(10, 5, 10) == pytest.approx(5.0)

    def test_fade_out_starts_before_zero(self):
        """淡出开始时间在 0 之前，钳制到 0."""
        # start=0, dur=3, fade=5 -> 0+3-5 = -2 -> 0
        assert calculate_fade_out_start(0, 3, 5) == 0.0


class TestCalculateEndTime:
    """结束时间计算测试."""

    def test_normal_case(self):
        """正常情况."""
        assert calculate_end_time(10, 30) == 40.0

    def test_zero_duration(self):
        """零时长."""
        assert calculate_end_time(10, 0) == 10.0

    def test_negative_duration(self):
        """负时长."""
        assert calculate_end_time(10, -5) == 10.0

    def test_zero_start(self):
        """零开始."""
        assert calculate_end_time(0, 100) == 100.0


class TestHasTimeRange:
    """时间范围判断测试."""

    def test_positive_duration(self):
        """正时长."""
        assert has_time_range(30) is True

    def test_zero_duration(self):
        """零时长."""
        assert has_time_range(0) is False

    def test_negative_duration(self):
        """负时长."""
        assert has_time_range(-5) is False


# ─────────────────────────────────────────────────────────────────────────────
# 滤镜构建测试
# ─────────────────────────────────────────────────────────────────────────────


class TestBuildScaleFilter:
    """缩放滤镜构建测试."""

    def test_fixed_width_height(self):
        """固定宽高."""
        result = build_scale_filter(width=200, height=100)
        assert result == "scale=200:100"

    def test_scale_only(self):
        """仅缩放."""
        result = build_scale_filter(scale=0.5)
        assert result == "scale=iw*0.5:ih*0.5"

    def test_no_scaling_needed(self):
        """无需缩放."""
        result = build_scale_filter(scale=1.0)
        assert result is None

    def test_scale_2x(self):
        """2倍缩放."""
        result = build_scale_filter(scale=2.0)
        assert result == "scale=iw*2.0:ih*2.0"

    def test_fixed_overrides_scale(self):
        """固定宽高优先于 scale."""
        result = build_scale_filter(width=100, height=50, scale=0.5)
        assert result == "scale=100:50"


class TestBuildOpacityFilter:
    """透明度滤镜构建测试."""

    def test_partial_opacity(self):
        """部分透明."""
        result = build_opacity_filter(0.5)
        assert result == "colorchannelmixer=aa=0.5"

    def test_fully_opaque(self):
        """完全不透明."""
        result = build_opacity_filter(1.0)
        assert result is None

    def test_fully_transparent(self):
        """完全透明."""
        result = build_opacity_filter(0.0)
        assert result == "colorchannelmixer=aa=0.0"

    def test_opacity_above_1_clamped(self):
        """超过 1 被钳制."""
        result = build_opacity_filter(1.5)
        assert result is None

    def test_opacity_below_0_clamped(self):
        """低于 0 被钳制."""
        result = build_opacity_filter(-0.5)
        assert result == "colorchannelmixer=aa=0.0"


class TestBuildImageFadeFilters:
    """图片淡入淡出滤镜测试."""

    def test_fade_in_only(self):
        """仅淡入."""
        result = build_image_fade_filters(10, 30, fade_in=1.0)
        assert len(result) == 1
        assert "fade=in:st=10:d=1.0:alpha=1" in result[0]

    def test_fade_out_only(self):
        """仅淡出."""
        result = build_image_fade_filters(10, 30, fade_out=2.0)
        assert len(result) == 1
        assert "fade=out" in result[0]
        assert "st=38.0" in result[0]  # 10 + 30 - 2 = 38

    def test_fade_in_and_out(self):
        """淡入+淡出."""
        result = build_image_fade_filters(0, 10, fade_in=1.0, fade_out=1.0)
        assert len(result) == 2
        assert "fade=in" in result[0]
        assert "fade=out" in result[1]

    def test_no_fade(self):
        """无淡入淡出."""
        result = build_image_fade_filters(10, 30)
        assert len(result) == 0

    def test_zero_duration_no_fade_out(self):
        """零时长不生成淡出."""
        result = build_image_fade_filters(10, 0, fade_out=1.0)
        assert len(result) == 0


class TestBuildEnableExpr:
    """enable 表达式构建测试."""

    def test_normal_duration(self):
        """正常时长."""
        result = build_enable_expr(10, 30)
        assert "between(t,10,40" in result
        assert "enable" in result

    def test_zero_duration(self):
        """零时长返回空."""
        result = build_enable_expr(10, 0)
        assert result == ""

    def test_negative_duration(self):
        """负时长返回空."""
        result = build_enable_expr(10, -5)
        assert result == ""

    def test_zero_start(self):
        """从零开始."""
        result = build_enable_expr(0, 100)
        assert "t,0,100" in result


# ─────────────────────────────────────────────────────────────────────────────
# drawtext 相关测试
# ─────────────────────────────────────────────────────────────────────────────


class TestEscapeDrawtextText:
    """文字转义测试."""

    def test_no_special_chars(self):
        """无特殊字符."""
        assert escape_drawtext_text("Hello") == "Hello"

    def test_colon_escaped(self):
        """冒号转义."""
        assert escape_drawtext_text("a:b") == "a\\:b"

    def test_quote_escaped(self):
        """单引号转义."""
        assert escape_drawtext_text("it's") == "it\\'s"

    def test_multiple_special_chars(self):
        """多个特殊字符."""
        assert escape_drawtext_text("a:b:c'd") == "a\\:b\\:c\\'d"

    def test_empty_string(self):
        """空字符串."""
        assert escape_drawtext_text("") == ""


class TestBuildDrawtextAlphaExpr:
    """drawtext alpha 表达式测试."""

    def test_no_fade(self):
        """无淡入淡出."""
        assert build_drawtext_alpha_expr(10, 30) == "1"

    def test_fade_in_only(self):
        """仅淡入."""
        result = build_drawtext_alpha_expr(10, 30, fade_in=2.0)
        assert "if(lt(t,12.0)" in result
        assert "(t-10)/2.0" in result

    def test_fade_out_only(self):
        """仅淡出."""
        result = build_drawtext_alpha_expr(10, 30, fade_out=3.0)
        assert "if(gt(t,37" in result
        assert "-t)/3.0" in result

    def test_fade_in_and_out(self):
        """淡入+淡出（相乘）."""
        result = build_drawtext_alpha_expr(0, 10, fade_in=1.0, fade_out=1.0)
        assert "*" in result
        assert result.count("if(") == 2

    def test_zero_duration_no_fade_out(self):
        """零时长不生成淡出."""
        result = build_drawtext_alpha_expr(10, 0, fade_out=1.0)
        assert result == "1"


class TestBuildStrokeParams:
    """描边参数测试."""

    def test_no_stroke(self):
        """无描边."""
        result = build_stroke_params(0)
        assert len(result) == 0

    def test_with_stroke(self):
        """有描边."""
        result = build_stroke_params(2, "red")
        assert len(result) == 2
        assert "borderw=2" in result
        assert "bordercolor=red" in result

    def test_negative_width(self):
        """负宽度."""
        result = build_stroke_params(-1)
        assert len(result) == 0


class TestBuildShadowParams:
    """阴影参数测试."""

    def test_no_shadow(self):
        """无阴影."""
        result = build_shadow_params(0)
        assert len(result) == 0

    def test_with_shadow(self):
        """有阴影."""
        result = build_shadow_params(0.5, 3, 4, "black")
        assert len(result) == 3
        assert "shadowx=3" in result
        assert "shadowy=4" in result
        assert "shadowcolor=black@0.5" in result

    def test_shadow_alpha_clamped(self):
        """透明度钳制."""
        result = build_shadow_params(1.5)
        assert "shadowcolor=black@1.0" in result[2]


# ─────────────────────────────────────────────────────────────────────────────
# 贴纸排序与过滤测试
# ─────────────────────────────────────────────────────────────────────────────


class TestSortStickersByZIndex:
    """贴纸排序测试."""

    def test_sorted_by_z_index(self):
        """按 z_index 排序."""
        stickers = [
            {"z_index": 20, "name": "top"},
            {"z_index": 5, "name": "bottom"},
            {"z_index": 10, "name": "middle"},
        ]
        result = sort_stickers_by_z_index(stickers)
        assert result[0]["name"] == "bottom"
        assert result[1]["name"] == "middle"
        assert result[2]["name"] == "top"

    def test_same_z_index_preserves_order(self):
        """相同 z_index 保持原顺序."""
        stickers = [
            {"z_index": 10, "name": "first"},
            {"z_index": 10, "name": "second"},
        ]
        result = sort_stickers_by_z_index(stickers)
        assert result[0]["name"] == "first"
        assert result[1]["name"] == "second"

    def test_empty_list(self):
        """空列表."""
        assert sort_stickers_by_z_index([]) == []

    def test_default_z_index_10(self):
        """无 z_index 默认 10."""
        stickers = [
            {"z_index": 5, "name": "low"},
            {"name": "default"},
        ]
        result = sort_stickers_by_z_index(stickers)
        assert result[0]["name"] == "low"
        assert result[1]["name"] == "default"


class TestFilterEnabledStickers:
    """启用贴纸过滤测试."""

    def test_all_enabled(self):
        """全部启用."""
        stickers = [{"enabled": True}, {"enabled": True}]
        assert len(filter_enabled_stickers(stickers)) == 2

    def test_mixed(self):
        """混合."""
        stickers = [
            {"enabled": True, "name": "a"},
            {"enabled": False, "name": "b"},
            {"enabled": True, "name": "c"},
        ]
        result = filter_enabled_stickers(stickers)
        assert len(result) == 2
        assert result[0]["name"] == "a"

    def test_default_enabled(self):
        """默认启用."""
        stickers = [{"name": "a"}]
        result = filter_enabled_stickers(stickers)
        assert len(result) == 1

    def test_empty_list(self):
        """空列表."""
        assert filter_enabled_stickers([]) == []


class TestCountStickerTypes:
    """贴纸类型统计测试."""

    def test_mixed_types(self):
        """混合类型."""
        stickers = [
            {"type": "image"},
            {"type": "text"},
            {"type": "image"},
        ]
        counts = count_sticker_types(stickers)
        assert counts["image"] == 2
        assert counts["text"] == 1

    def test_default_type(self):
        """默认 image."""
        stickers = [{}]
        counts = count_sticker_types(stickers)
        assert counts["image"] == 1

    def test_empty_list(self):
        """空列表."""
        assert count_sticker_types([]) == {}


# ─────────────────────────────────────────────────────────────────────────────
# overlay 相关测试
# ─────────────────────────────────────────────────────────────────────────────


class TestBuildOverlayPosition:
    """overlay 位置构建测试."""

    def test_integer_position(self):
        """整数位置."""
        assert build_overlay_position(100, 200) == "100:200"

    def test_float_position_rounded(self):
        """浮点取整."""
        assert build_overlay_position(100.6, 200.4) == "101:200"

    def test_zero_position(self):
        """零位置."""
        assert build_overlay_position(0, 0) == "0:0"

    def test_negative_position(self):
        """负位置."""
        assert build_overlay_position(-10, -20) == "-10:-20"


class TestBuildPreFilterLabel:
    """预处理标签构建测试."""

    def test_normal_idx(self):
        """正常索引."""
        assert build_pre_filter_label(3) == "sticker_3_scaled"

    def test_zero_idx(self):
        """零索引."""
        assert build_pre_filter_label(0) == "sticker_0_scaled"


# ─────────────────────────────────────────────────────────────────────────────
# 验证函数测试
# ─────────────────────────────────────────────────────────────────────────────


class TestValidateImageSticker:
    """图片贴纸验证测试."""

    def test_valid_with_image_path(self):
        """有 image_path，合法."""
        ok, errors = validate_image_sticker({"image_path": "/a.png"})
        assert ok is True
        assert len(errors) == 0

    def test_valid_with_asset_id(self):
        """有 asset_id，合法."""
        ok, errors = validate_image_sticker({"asset_id": "123"})
        assert ok is True

    def test_missing_image_source(self):
        """缺图片来源."""
        ok, errors = validate_image_sticker({})
        assert ok is False
        assert any("image_path" in e or "asset_id" in e for e in errors)

    def test_opacity_out_of_range(self):
        """透明度超范围."""
        ok, errors = validate_image_sticker(
            {
                "image_path": "/a.png",
                "opacity": 1.5,
            }
        )
        assert ok is False
        assert any("opacity" in e for e in errors)

    def test_negative_scale(self):
        """负缩放."""
        ok, errors = validate_image_sticker(
            {
                "image_path": "/a.png",
                "scale": -0.5,
            }
        )
        assert ok is False
        assert any("scale" in e for e in errors)

    def test_negative_duration(self):
        """负时长."""
        ok, errors = validate_image_sticker(
            {
                "image_path": "/a.png",
                "duration": -10,
            }
        )
        assert ok is False
        assert any("duration" in e for e in errors)

    def test_multiple_errors(self):
        """多个错误."""
        ok, errors = validate_image_sticker(
            {
                "opacity": 1.5,
                "duration": -1,
                "start_time": -5,
            }
        )
        assert ok is False
        assert len(errors) >= 3


class TestValidateTextSticker:
    """文字贴纸验证测试."""

    def test_valid(self):
        """合法配置."""
        ok, errors = validate_text_sticker(
            {
                "text": "Hello",
                "font_size": 36,
                "font_color": "white",
            }
        )
        assert ok is True
        assert len(errors) == 0

    def test_empty_text(self):
        """空文字."""
        ok, errors = validate_text_sticker({"text": ""})
        assert ok is False
        assert any("text" in e for e in errors)

    def test_zero_font_size(self):
        """零字号."""
        ok, errors = validate_text_sticker(
            {
                "text": "Hi",
                "font_size": 0,
            }
        )
        assert ok is False
        assert any("font_size" in e for e in errors)

    def test_empty_font_color(self):
        """空颜色."""
        ok, errors = validate_text_sticker(
            {
                "text": "Hi",
                "font_color": "",
            }
        )
        assert ok is False
        assert any("font_color" in e for e in errors)

    def test_negative_duration(self):
        """负时长."""
        ok, errors = validate_text_sticker(
            {
                "text": "Hi",
                "duration": -5,
            }
        )
        assert ok is False
        assert any("duration" in e for e in errors)