"""compatibility.py — 두 사주 궁합 점수 + breakdown 검증.

saju-web/app/compatibility/result/page.tsx의 calculateCompatibility() 로직과 1:1 매핑.
알고리즘:
    score = 50 (base)
    + (same: +10 / produce|produced: +25 / overcome|overcomed: -10)
    + (six_harmony: +20)
    + (three_harmony: +15)
    + (conflict: -20)
    clamp(0, 100)
"""
from app.calculator.core import calculate_saju
from app.calculator.compatibility import (
    calculate_compatibility,
    _get_element_relation,
    _get_branch_relation,
)


# ─── 단위 헬퍼 테스트 ─────────────────────────────────────────────
def test_element_relation_same():
    assert _get_element_relation("金", "金") == "same"


def test_element_relation_produce():
    # 木 → 火 (목생화): el1 produces el2
    assert _get_element_relation("木", "火") == "produce"


def test_element_relation_produced():
    # 火 ← 木: el1 is produced by el2
    assert _get_element_relation("火", "木") == "produced"


def test_element_relation_overcome():
    # 金 → 木 (금극목): el1 overcomes el2
    assert _get_element_relation("金", "木") == "overcome"


def test_element_relation_overcomed():
    # 木 ← 金: el1 is overcomed by el2
    assert _get_element_relation("木", "金") == "overcomed"


def test_branch_six_harmony():
    # 寅亥 6합
    rel = _get_branch_relation("寅", "亥")
    assert rel["six_harmony"] is True
    assert rel["conflict"] is False


def test_branch_three_harmony():
    # 亥卯未 3합 — 亥+卯
    rel = _get_branch_relation("亥", "卯")
    assert rel["three_harmony"] is True


def test_branch_conflict():
    # 子午 충
    rel = _get_branch_relation("子", "午")
    assert rel["conflict"] is True
    assert rel["six_harmony"] is False


def test_branch_same_not_three_harmony():
    # 같은 지지는 3합 아님 (서로 다른 지지여야 합)
    rel = _get_branch_relation("未", "未")
    assert rel["three_harmony"] is False
    assert rel["six_harmony"] is False
    assert rel["conflict"] is False


# ─── 통합: calculate_compatibility ────────────────────────────────
def test_score_range_0_to_100():
    """모든 결과가 0~100 범위 + breakdown 키 존재."""
    a = calculate_saju(1990, 5, 15, 14, "male")
    b = calculate_saju(1992, 8, 8, 18, "female")
    result = calculate_compatibility(a, b)
    assert 0 <= result["score"] <= 100
    assert "breakdown" in result
    bd = result["breakdown"]
    assert "day_master_element" in bd
    assert "branch_interaction" in bd
    assert "base" in bd
    assert bd["base"] == 50


def test_same_saju_same_element_no_branch_interaction():
    """1990-5-15 male+female (둘 다 辛未/金) — same element, 같은 일지(중립) → 50+10+0 = 60."""
    a = calculate_saju(1990, 5, 15, 14, "male")
    b = calculate_saju(1990, 5, 15, 14, "female")
    result = calculate_compatibility(a, b)
    assert result["score"] == 60
    assert result["breakdown"]["day_master_element"]["relation"] == "same"
    assert result["breakdown"]["day_master_element"]["score"] == 10
    assert result["breakdown"]["branch_interaction"]["score"] == 0


def test_six_harmony_plus_produce_high_score():
    """1985-1-1 (辛卯/金) + 1989-7-10 (壬戌/水)
       → 金生水 (produce) +25, 卯戌 6합 +20 → 50+25+20 = 95.
    """
    a = calculate_saju(1985, 1, 1, 12, "male")
    b = calculate_saju(1989, 7, 10, 12, "male")
    result = calculate_compatibility(a, b)
    assert result["score"] == 95
    bd = result["breakdown"]
    assert bd["day_master_element"]["relation"] == "produce"
    assert bd["day_master_element"]["score"] == 25
    assert bd["branch_interaction"]["flags"]["six_harmony"] is True
    assert bd["branch_interaction"]["score"] == 20


def test_conflict_plus_overcome_low_score():
    """1988-12-1 (辛巳/金) + 1992-3-21 (丁亥/火)
       → 火→金 (overcomed) -10, 巳亥 충 -20 → 50-10-20 = 20.
    """
    a = calculate_saju(1988, 12, 1, 8, "male")
    b = calculate_saju(1992, 3, 21, 12, "female")
    result = calculate_compatibility(a, b)
    assert result["score"] == 20
    bd = result["breakdown"]
    assert bd["day_master_element"]["relation"] in ("overcome", "overcomed")
    assert bd["day_master_element"]["score"] == -10
    assert bd["branch_interaction"]["flags"]["conflict"] is True
    assert bd["branch_interaction"]["score"] == -20


def test_three_harmony_plus_overcome():
    """1990-5-15 (辛未/金) + 1992-3-21 (丁亥/火)
       → 火→金 (overcomed) -10, 亥未 3합 +15 → 50-10+15 = 55.
    """
    a = calculate_saju(1990, 5, 15, 14, "male")
    b = calculate_saju(1992, 3, 21, 12, "female")
    result = calculate_compatibility(a, b)
    assert result["score"] == 55
    bd = result["breakdown"]
    assert bd["day_master_element"]["score"] == -10
    assert bd["branch_interaction"]["flags"]["three_harmony"] is True
    assert bd["branch_interaction"]["score"] == 15


def test_score_clamp_at_zero():
    """극단 케이스: 상극(-10) + 충(-20) = 50-30 = 20. clamp 동작 검증을 위한 sanity."""
    a = calculate_saju(1988, 12, 1, 8, "male")
    b = calculate_saju(1992, 3, 21, 12, "female")
    result = calculate_compatibility(a, b)
    assert result["score"] >= 0
    assert result["score"] <= 100


def test_breakdown_descriptions_non_empty():
    """breakdown의 description 필드가 비어있지 않음."""
    a = calculate_saju(1990, 5, 15, 14, "male")
    b = calculate_saju(1995, 8, 20, 12, "female")
    result = calculate_compatibility(a, b)
    bd = result["breakdown"]
    assert isinstance(bd["day_master_element"]["description"], str)
    assert len(bd["day_master_element"]["description"]) > 0
    assert isinstance(bd["branch_interaction"]["description"], str)
    assert len(bd["branch_interaction"]["description"]) > 0


def test_symmetry_score_only():
    """A vs B와 B vs A의 score는 동일 (saju-web과 동일하게 대칭).

    note: relation 태그(produce vs produced)는 비대칭일 수 있으나
    delta 점수는 동일하므로 최종 score는 항상 같다.
    """
    a = calculate_saju(1985, 1, 1, 12, "male")
    b = calculate_saju(1989, 7, 10, 12, "male")
    r_ab = calculate_compatibility(a, b)
    r_ba = calculate_compatibility(b, a)
    assert r_ab["score"] == r_ba["score"]
