"""预算管理模块测试 — 预算计划CRUD + 自动分解 + 版本 + 偏差/对比/配置/滚动"""
import pytest
from fastapi.testclient import TestClient
from sqlalchemy.orm import Session
from tests.conftest import create_test_user, get_token_for_user, auth_header, create_test_kpi
from app.models.budget_plan import BudgetPlan


class TestBudgetPlans:
    """预算计划CRUD测试"""

    BASE = "/api/cma/budget"

    def test_list_plans_empty(self, client: TestClient, db: Session):
        """空列表"""
        create_test_user(db)
        token = get_token_for_user(client)

        resp = client.get(f"{self.BASE}/plans", headers=auth_header(token))
        assert resp.status_code == 200
        assert resp.json()["data"] == []

    def test_create_plan(self, client: TestClient, db: Session):
        """创建预算计划"""
        create_test_user(db)
        token = get_token_for_user(client)
        kpi = create_test_kpi(db, kpi_code="BUDGET_KPI_01")

        resp = client.post(
            f"{self.BASE}/plans",
            headers=auth_header(token),
            json={"kpi_id": kpi.id, "period": "2026-06", "budget_value": 50000.0},
        )
        assert resp.status_code == 200
        assert resp.json()["message"] == "预算已创建"
        assert resp.json()["id"] > 0

    def test_create_plan_duplicate_upsert(self, client: TestClient, db: Session):
        """重复创建同一KPI+期间 → 更新而非新增"""
        create_test_user(db)
        token = get_token_for_user(client)
        kpi = create_test_kpi(db, kpi_code="BUDGET_KPI_02")

        # 创建
        client.post(
            f"{self.BASE}/plans",
            headers=auth_header(token),
            json={"kpi_id": kpi.id, "period": "2026-06", "budget_value": 30000.0},
        )
        # 再次创建（更新）
        resp = client.post(
            f"{self.BASE}/plans",
            headers=auth_header(token),
            json={"kpi_id": kpi.id, "period": "2026-06", "budget_value": 35000.0},
        )
        assert resp.status_code == 200
        assert resp.json()["message"] == "预算已更新"

    def test_create_plan_missing_fields(self, client: TestClient, db: Session):
        """缺少必要参数被拒绝"""
        create_test_user(db)
        token = get_token_for_user(client)

        resp = client.post(
            f"{self.BASE}/plans",
            headers=auth_header(token),
            json={"kpi_id": 1},  # 缺少 period 和 budget_value
        )
        assert resp.status_code == 400

    def test_update_plan(self, client: TestClient, db: Session):
        """更新预算计划"""
        create_test_user(db)
        token = get_token_for_user(client)
        kpi = create_test_kpi(db, kpi_code="BUDGET_KPI_03")

        create_resp = client.post(
            f"{self.BASE}/plans",
            headers=auth_header(token),
            json={"kpi_id": kpi.id, "period": "2026-06", "budget_value": 100.0},
        )
        plan_id = create_resp.json()["id"]

        resp = client.put(
            f"{self.BASE}/plans/{plan_id}",
            headers=auth_header(token),
            json={"budget_value": 200.0, "remark": "已更新"},
        )
        assert resp.status_code == 200

    def test_delete_plan(self, client: TestClient, db: Session):
        """删除预算计划"""
        create_test_user(db)
        token = get_token_for_user(client)
        kpi = create_test_kpi(db, kpi_code="BUDGET_KPI_04")

        create_resp = client.post(
            f"{self.BASE}/plans",
            headers=auth_header(token),
            json={"kpi_id": kpi.id, "period": "2026-06", "budget_value": 100.0},
        )
        plan_id = create_resp.json()["id"]

        resp = client.delete(f"{self.BASE}/plans/{plan_id}", headers=auth_header(token))
        assert resp.status_code == 200
        assert resp.json()["message"] == "预算已删除"

        # 验证已删除
        get_resp = client.get(f"{self.BASE}/plans", headers=auth_header(token))
        ids = [p["id"] for p in get_resp.json()["data"]]
        assert plan_id not in ids


class TestBudgetAutoDecompose:
    """预算自动分解测试"""

    BASE = "/api/cma/budget"

    def test_auto_decompose_single_kpi(self, client: TestClient, db: Session):
        """单KPI自动分解年度预算为月度（均分）"""
        create_test_user(db)
        token = get_token_for_user(client)
        kpi = create_test_kpi(db, kpi_code="BUDGET_DECOMPOSE")

        resp = client.post(
            f"{self.BASE}/auto-decompose",
            headers=auth_header(token),
            json={"kpi_id": kpi.id, "annual_budget": 120000, "year": 2026, "method": "equal"},
        )
        assert resp.status_code == 200
        data = resp.json()
        assert "已分解" in data["message"]
        assert len(data["monthly_budgets"]) == 12
        # 年度预算120000，12个月均分，每月10000
        assert data["monthly_budgets"][0]["value"] == 10000.0

    def test_auto_decompose_missing(self, client: TestClient, db: Session):
        """没有年度预算数据时尝试分解 → 400"""
        create_test_user(db)
        token = get_token_for_user(client)
        create_test_kpi(db, kpi_code="BUDGET_NO_DATA")

        resp = client.post(
            f"{self.BASE}/auto-decompose",
            headers=auth_header(token),
            json={"year": 2026, "method": "equal"},
        )
        assert resp.status_code == 400


class TestBudgetVersions:
    """预算版本管理测试"""

    BASE = "/api/cma/budget"

    def test_create_and_submit_version(self, client: TestClient, db: Session):
        """创建预算后查询版本并提交（端点已移除，预期404）"""
        create_test_user(db)
        token = get_token_for_user(client)
        kpi = create_test_kpi(db, kpi_code="BUDGET_VER_KPI")

        # 创建一条预算
        client.post(
            f"{self.BASE}/plans",
            headers=auth_header(token),
            json={"kpi_id": kpi.id, "period": "2026-06", "budget_value": 10000.0},
        )

        # 版本端点已移除
        ver_resp = client.get(f"{self.BASE}/versions", headers=auth_header(token))
        assert ver_resp.status_code == 404, "versions端点已移除"

    def test_approve_version(self, client: TestClient, db: Session):
        """审批通过版本（端点已移除，预期404）"""
        create_test_user(db)
        token = get_token_for_user(client)

        resp = client.post(
            f"{self.BASE}/versions/approve",
            headers=auth_header(token),
            json={"version": "v1.0", "action": "approved"},
        )
        assert resp.status_code == 404, "versions/approve端点已移除"

    def test_reject_version(self, client: TestClient, db: Session):
        """驳回版本（端点已移除，预期404）"""
        create_test_user(db)
        token = get_token_for_user(client)

        resp = client.post(
            f"{self.BASE}/versions/approve",
            headers=auth_header(token),
            json={"version": "v2.0", "action": "rejected"},
        )
        assert resp.status_code == 404, "versions/approve端点已移除"


class TestBudgetDeviationReport:
    """偏差报告（实际 vs 预算汇总）"""

    BASE = "/api/cma/budget"

    def _seed(self, db: Session):
        kpi = create_test_kpi(db, kpi_code="BUDGET_DEV_KPI")
        db.add(BudgetPlan(kpi_id=kpi.id, period="2026-06", budget_value=100.0,
                          budget_year=2026, budget_month=6, status="active"))
        from app.models import KPIValue
        db.add(KPIValue(kpi_id=kpi.id, period="2026-06", actual_value=120.0))
        db.commit()
        return kpi

    def test_deviation_report_over_budget(self, client: TestClient, db: Session):
        """实际超出预算 → 超支统计"""
        create_test_user(db)
        token = get_token_for_user(client)
        self._seed(db)

        resp = client.get(f"{self.BASE}/deviation-report?year=2026&month=6",
                          headers=auth_header(token))
        assert resp.status_code == 200
        data = resp.json()
        assert data["period"] == "2026-06"
        assert data["summary"]["total_kpis"] == 1
        assert data["summary"]["has_budget"] == 1
        assert data["summary"]["over_budget"] == 1
        # 120 vs 100 → +20%
        assert data["items"][0]["deviation_rate"] == 20.0

    def test_deviation_report_alert_level_filter(self, client: TestClient, db: Session):
        """按预警等级过滤（>20%红 / >10%黄）"""
        create_test_user(db)
        token = get_token_for_user(client)
        self._seed(db)

        resp = client.get(f"{self.BASE}/deviation-report?year=2026&month=6&alert_level=red",
                          headers=auth_header(token))
        assert resp.status_code == 200
        # summary统计全部KPI；items按alert_level过滤
        assert resp.json()["summary"]["total_kpis"] == 1
        assert len(resp.json()["items"]) == 0  # 20% 不是 >20，非red

        resp2 = client.get(f"{self.BASE}/deviation-report?year=2026&month=6&alert_level=yellow",
                           headers=auth_header(token))
        assert resp2.status_code == 200
        assert len(resp2.json()["items"]) == 1


class TestBudgetConfig:
    """预算模式配置"""

    BASE = "/api/cma/budget"

    def test_default_config(self, client: TestClient, db: Session):
        """未配置时默认固定预算"""
        create_test_user(db)
        token = get_token_for_user(client)

        resp = client.get(f"{self.BASE}/config", headers=auth_header(token))
        assert resp.status_code == 200
        assert resp.json()["budget_mode"] == "fixed"
        assert resp.json()["rolling_months"] == 12

    def test_set_config_rolling(self, client: TestClient, db: Session):
        """切换为滚动预算"""
        create_test_user(db)
        token = get_token_for_user(client)

        resp = client.post(f"{self.BASE}/config", headers=auth_header(token),
                           json={"mode": "rolling", "rolling_months": 6})
        assert resp.status_code == 200
        assert resp.json()["budget_mode"] == "rolling"

        get_resp = client.get(f"{self.BASE}/config", headers=auth_header(token))
        cfg = get_resp.json()
        # GET返回存的JSON {mode:...}（前端兼容 budget_mode || mode）
        assert (cfg.get("budget_mode") or cfg.get("mode")) == "rolling"
        assert cfg.get("rolling_months") == 6

    def test_set_config_invalid_mode(self, client: TestClient, db: Session):
        """非法模式 → 400"""
        create_test_user(db)
        token = get_token_for_user(client)

        resp = client.post(f"{self.BASE}/config", headers=auth_header(token),
                           json={"mode": "weird"})
        assert resp.status_code == 400


class TestBudgetRollForward:
    """滚动预算自动延展"""

    BASE = "/api/cma/budget"

    def test_roll_forward_requires_rolling_mode(self, client: TestClient, db: Session):
        """固定预算模式 → 400"""
        create_test_user(db)
        token = get_token_for_user(client)

        resp = client.post(f"{self.BASE}/roll-forward", headers=auth_header(token))
        assert resp.status_code == 400
        assert "未配置" in resp.json()["detail"]

    def test_roll_forward_success(self, client: TestClient, db: Session):
        """滚动模式延展：删除最早月 + 新增未来月"""
        create_test_user(db)
        token = get_token_for_user(client)
        kpi = create_test_kpi(db, kpi_code="BUDGET_ROLL_KPI")

        # 切滚动模式
        client.post(f"{self.BASE}/config", headers=auth_header(token),
                    json={"mode": "rolling", "rolling_months": 12})

        # 造12个月预算
        from app.models import KPIValue
        for m in range(1, 13):
            db.add(BudgetPlan(kpi_id=kpi.id, period=f"2026-{m:02d}",
                              budget_value=1000.0 + m, budget_year=2026,
                              budget_month=m, status="active"))
        db.commit()

        resp = client.post(f"{self.BASE}/roll-forward", headers=auth_header(token))
        assert resp.status_code == 200
        data = resp.json()
        assert "滚动预算已延展" in data["message"]
        assert len(data["rolled_kpis"]) == 1
        # 新增月份 = 当前月(08) + 12 = 明年08
        assert data["rolled_kpis"][0]["added_period"].startswith("2027-")

        # 最早月(2026-01)被删除
        from app.models import BudgetPlan as BP
        periods = [p.period for p in db.query(BP).filter(BP.kpi_id == kpi.id).all()]
        assert "2026-01" not in periods
        assert "2027-08" in periods


class TestBudgetComparison:
    """实际 vs 预测对比"""

    BASE = "/api/cma/budget"

    def _seed(self, db: Session):
        kpi = create_test_kpi(db, kpi_code="BUDGET_CMP_KPI")
        db.add(BudgetPlan(kpi_id=kpi.id, period="2026-06", budget_value=100.0,
                          budget_year=2026, budget_month=6, status="active"))
        from app.models import KPIValue
        db.add(KPIValue(kpi_id=kpi.id, period="2026-06", actual_value=80.0))
        db.commit()
        return kpi

    def test_comparison(self, client: TestClient, db: Session):
        """全KPI对比（固定预算12个月）"""
        create_test_user(db)
        token = get_token_for_user(client)
        self._seed(db)

        resp = client.get(f"{self.BASE}/comparison?year=2026", headers=auth_header(token))
        assert resp.status_code == 200
        data = resp.json()
        assert data["budget_mode"] == "fixed"
        assert len(data["periods"]) == 12
        # 6月有预算+实际
        june = [m for m in data["months_data"] if m["period"] == "2026-06"][0]
        assert june["budget_total"] == 100.0
        assert june["actual_total"] == 80.0
        assert june["deviation_rate"] == -20.0

    def test_comparison_kpi_detail(self, client: TestClient, db: Session):
        """单KPI对比"""
        create_test_user(db)
        token = get_token_for_user(client)
        kpi = self._seed(db)

        resp = client.get(f"{self.BASE}/comparison/kpi/{kpi.id}?year=2026",
                          headers=auth_header(token))
        assert resp.status_code == 200
        data = resp.json()
        assert data["kpi_code"] == "BUDGET_CMP_KPI"
        june = [d for d in data["data_points"] if d["period"] == "2026-06"][0]
        assert june["budget_value"] == 100.0
        assert june["actual_value"] == 80.0
        assert june["deviation_rate"] == -20.0

    def test_comparison_kpi_not_found(self, client: TestClient, db: Session):
        """KPI不存在 → 404"""
        create_test_user(db)
        token = get_token_for_user(client)
        resp = client.get(f"{self.BASE}/comparison/kpi/99999?year=2026",
                          headers=auth_header(token))
        assert resp.status_code == 404


class TestBudgetDeviationCheck:
    """预算偏差自动预警"""

    BASE = "/api/cma/budget"

    def _seed(self, db: Session):
        kpi = create_test_kpi(db, kpi_code="BUDGET_ALERT_KPI")
        db.add(BudgetPlan(kpi_id=kpi.id, period="2026-06", budget_value=100.0,
                          budget_year=2026, budget_month=6, status="active"))
        from app.models import KPIValue
        db.add(KPIValue(kpi_id=kpi.id, period="2026-06", actual_value=150.0))  # +50%
        db.commit()
        return kpi

    def test_deviation_check_generates_alert(self, client: TestClient, db: Session):
        """超阈值生成预警"""
        create_test_user(db)
        token = get_token_for_user(client)
        kpi = self._seed(db)

        resp = client.post(f"{self.BASE}/deviation-check", headers=auth_header(token),
                           json={"period": "2026-06", "threshold": 20})
        assert resp.status_code == 200
        data = resp.json()
        assert data["alerts_generated"] == 1
        assert data["alerts"][0]["deviation_rate"] == 50.0
        # 50% 不 >50，为 warning；>50% 才是 critical
        assert data["alerts"][0]["alert_level"] == "warning"

    def test_deviation_check_no_budget(self, client: TestClient, db: Session):
        """无预算数据 → 不生成预警"""
        create_test_user(db)
        token = get_token_for_user(client)

        resp = client.post(f"{self.BASE}/deviation-check", headers=auth_header(token),
                           json={"period": "2026-01"})
        assert resp.status_code == 200
        assert resp.json()["alerts_generated"] == 0

    def test_deviation_check_under_threshold(self, client: TestClient, db: Session):
        """未超阈值不生成预警"""
        create_test_user(db)
        token = get_token_for_user(client)
        kpi = create_test_kpi(db, kpi_code="BUDGET_ALERT_OK")
        db.add(BudgetPlan(kpi_id=kpi.id, period="2026-06", budget_value=100.0,
                          budget_year=2026, budget_month=6, status="active"))
        from app.models import KPIValue
        db.add(KPIValue(kpi_id=kpi.id, period="2026-06", actual_value=105.0))  # +5%
        db.commit()

        resp = client.post(f"{self.BASE}/deviation-check", headers=auth_header(token),
                           json={"period": "2026-06", "threshold": 20})
        assert resp.json()["alerts_generated"] == 0


class TestBudgetDeviationAlerts:
    """偏差预警记录查询/更新"""

    BASE = "/api/cma/budget"

    def _seed_alert(self, client, db: Session, token: str):
        kpi = create_test_kpi(db, kpi_code="BUDGET_DEV_ALERT")
        db.add(BudgetPlan(kpi_id=kpi.id, period="2026-06", budget_value=100.0,
                          budget_year=2026, budget_month=6, status="active"))
        from app.models import KPIValue
        db.add(KPIValue(kpi_id=kpi.id, period="2026-06", actual_value=200.0))
        db.commit()
        client.post(f"{self.BASE}/deviation-check", headers=auth_header(token),
                    json={"period": "2026-06"})
        return kpi

    def test_list_alerts(self, client: TestClient, db: Session):
        """预警列表"""
        create_test_user(db)
        token = get_token_for_user(client)
        self._seed_alert(client, db, token)

        resp = client.get(f"{self.BASE}/deviation-alerts", headers=auth_header(token))
        assert resp.status_code == 200
        assert resp.json()["total"] == 1
        alert = resp.json()["data"][0]
        assert alert["status"] == "open"
        assert alert["kpi_code"] == "BUDGET_DEV_ALERT"
        assert alert["alert_level"] == "critical"

    def test_list_alerts_filters(self, client: TestClient, db: Session):
        """按状态/等级过滤"""
        create_test_user(db)
        token = get_token_for_user(client)
        self._seed_alert(client, db, token)

        resp = client.get(f"{self.BASE}/deviation-alerts?status=open&alert_level=critical",
                          headers=auth_header(token))
        assert resp.json()["total"] == 1

        resp2 = client.get(f"{self.BASE}/deviation-alerts?status=resolved",
                           headers=auth_header(token))
        assert resp2.json()["total"] == 0

    def test_update_alert_resolve(self, client: TestClient, db: Session):
        """标记预警已解决"""
        create_test_user(db)
        token = get_token_for_user(client)
        self._seed_alert(client, db, token)

        alert_id = client.get(f"{self.BASE}/deviation-alerts",
                              headers=auth_header(token)).json()["data"][0]["id"]
        resp = client.put(f"{self.BASE}/deviation-alerts/{alert_id}",
                          headers=auth_header(token), json={"status": "resolved"})
        assert resp.status_code == 200

        list_resp = client.get(f"{self.BASE}/deviation-alerts",
                               headers=auth_header(token))
        assert list_resp.json()["data"][0]["status"] == "resolved"

    def test_update_alert_not_found(self, client: TestClient, db: Session):
        """更新不存在的预警 → 404"""
        create_test_user(db)
        token = get_token_for_user(client)
        resp = client.put(f"{self.BASE}/deviation-alerts/99999",
                          headers=auth_header(token), json={"status": "resolved"})
        assert resp.status_code == 404


class TestBudgetMethodComparison:
    """预算方法三选一对比"""

    BASE = "/api/cma/budget"

    def test_method_comparison_defaults(self, client: TestClient, db: Session):
        """默认参数返回三种方法"""
        create_test_user(db)
        token = get_token_for_user(client)

        resp = client.post(f"{self.BASE}/method-comparison", headers=auth_header(token),
                           json={})
        assert resp.status_code == 200
        data = resp.json()
        assert len(data["methods"]) == 3
        ids = {m["id"] for m in data["methods"]}
        assert ids == {"incremental", "zero_based", "flexible"}
        assert data["recommended"] == "zero_based"

    def test_method_comparison_custom(self, client: TestClient, db: Session):
        """自定义参数：增量预算结果 = 上月×(1+增幅)"""
        create_test_user(db)
        token = get_token_for_user(client)

        resp = client.post(f"{self.BASE}/method-comparison", headers=auth_header(token),
                           json={"entity": "bohai", "last_month_budget": 100,
                                 "current_revenue": 200, "increment_rate": 0.1})
        assert resp.status_code == 200
        data = resp.json()
        assert data["entity_name"] == "陕西博海科技（IT服务）"
        incremental = [m for m in data["methods"] if m["id"] == "incremental"][0]
        assert incremental["result_value"] == 110.0  # 100 × 1.1


class TestBudgetPermissions:
    """权限边界：business角色无访问权限"""

    BASE = "/api/cma/budget"

    def test_business_role_denied(self, client: TestClient, db: Session):
        """business用户访问预算 → 403"""
        import hashlib
        from app.models import User
        business = User(
            username="business_budget",
            password_hash=hashlib.sha256("pass123".encode()).hexdigest(),
            name="业务员",
            role="business",
        )
        db.add(business)
        db.commit()
        token = get_token_for_user(client, username="business_budget", password="pass123")

        resp = client.get(f"{self.BASE}/plans", headers=auth_header(token))
        assert resp.status_code == 403