"""
转场特效 API 单元测试

覆盖：
- GET /transition-presets - 转场预设列表
- PUT /clips/{clip_id}/transition - 设置单个片段转场
- POST /{plan_id}/transitions/batch - 批量设置转场
"""

from __future__ import annotations

import os
import sys
from datetime import datetime
from pathlib import Path
from typing import Optional
from unittest.mock import MagicMock

os.environ.setdefault("JWT_SECRET_KEY", "unit-test-secret-key-for-testing")
os.environ.setdefault("DATABASE_URL", "sqlite:///test.db")

import pytest

sys.path.insert(0, str(Path(__file__).resolve().parents[2] / "apps" / "api"))

from fastapi import FastAPI
from fastapi.testclient import TestClient

from packages.domain.config_schemas import normalize_plan_config
from packages.domain.edit_plan import EditPlan, EditPlanStatus
from packages.domain.edit_plan_clip import EditPlanClip, EditPlanClipStatus
from packages.domain.transition_presets import TRANSITION_PRESET_LIBRARY

# ---------------------------------------------------------------------------
# Stub Repository
# ---------------------------------------------------------------------------


class StubEditPlanRepository:
    def __init__(self, plans: dict[str, EditPlan] | None = None):
        self._plans = plans or {}

    def list_all(self, *, status=None, skip=0, limit=50):
        items = list(self._plans.values())
        if status is not None:
            items = [p for p in items if p.status == status]
        items.sort(key=lambda p: p.created_at, reverse=True)
        return items[skip : skip + limit]

    def list_by_template(self, template_id, *, status=None, skip=0, limit=50):
        items = [p for p in self._plans.values() if p.template_id == template_id]
        if status is not None:
            items = [p for p in items if p.status == status]
        items.sort(key=lambda p: p.created_at, reverse=True)
        return items[skip : skip + limit]

    def get(self, plan_id: str) -> Optional[EditPlan]:
        return self._plans.get(plan_id)

    def create(self, plan: EditPlan) -> EditPlan:
        self._plans[plan.id] = plan
        return plan

    def update(self, plan: EditPlan) -> EditPlan:
        self._plans[plan.id] = plan
        return plan

    def delete(self, plan_id: str) -> bool:
        if plan_id in self._plans:
            del self._plans[plan_id]
            return True
        return False

    def count(self, *, status=None, template_id=None):
        items = list(self._plans.values())
        if status is not None:
            items = [p for p in items if p.status == status]
        if template_id is not None:
            items = [p for p in items if p.template_id == template_id]
        return len(items)


class StubEditPlanClipRepository:
    def __init__(self, clips: dict[str, EditPlanClip] | None = None):
        self._clips = clips or {}
        self._counter = 0

    def _next_id(self) -> str:
        self._counter += 1
        return f"clip-new{self._counter}"

    def list_by_plan(self, plan_id, *, status=None, skip=0, limit=100):
        items = [c for c in self._clips.values() if c.plan_id == plan_id]
        if status is not None:
            items = [c for c in items if c.status == status]
        items.sort(key=lambda c: c.order)
        return items[skip : skip + limit]

    def count(self, plan_id, *, status=None):
        items = [c for c in self._clips.values() if c.plan_id == plan_id]
        if status is not None:
            items = [c for c in items if c.status == status]
        return len(items)

    def get(self, clip_id: str) -> Optional[EditPlanClip]:
        return self._clips.get(clip_id)

    def create(self, clip: EditPlanClip) -> EditPlanClip:
        if not clip.id:
            clip.id = self._next_id()
        self._clips[clip.id] = clip
        return clip

    def update(self, clip: EditPlanClip) -> EditPlanClip:
        self._clips[clip.id] = clip
        return clip

    def delete(self, clip_id: str) -> bool:
        if clip_id in self._clips:
            del self._clips[clip_id]
            return True
        return False

    def delete_by_plan(self, plan_id: str) -> int:
        to_delete = [cid for cid, c in self._clips.items() if c.plan_id == plan_id]
        for cid in to_delete:
            del self._clips[cid]
        return len(to_delete)


# ---------------------------------------------------------------------------
# Test Fixtures
# ---------------------------------------------------------------------------


def _make_sample_plan(plan_id="plan-001"):
    return EditPlan(
        id=plan_id,
        template_id="tpl-001",
        name="测试计划",
        status=EditPlanStatus.EDITING,
        total_duration=30.0,
        config=normalize_plan_config({}),
        project_id="",
        created_by_user_id="user-001",
        created_at=datetime(2026, 7, 16, 10, 0, 0),
        updated_at=datetime(2026, 7, 16, 10, 0, 0),
    )


def _make_clip(clip_id, plan_id="plan-001", order=0, transition_effect="cut", transition_duration=0.0):
    return EditPlanClip(
        id=clip_id,
        plan_id=plan_id,
        clip_type="video",
        order=order,
        asset_id="asset-001",
        text_content="",
        start_time=0.0,
        duration=10.0,
        transition_effect=transition_effect,
        transition_duration=transition_duration,
        playback_speed=1.0,
        status=EditPlanClipStatus.READY,
        config={},
        created_at=datetime(2026, 7, 16, 10, 0, 0),
        updated_at=datetime(2026, 7, 16, 10, 0, 0),
    )


def _create_test_app():
    import app.api.routes.edit_plans_transitions as transitions_module
    import app.services.edit_plan_service as service_module
    from app.api.routes.edit_plans import router

    plan = _make_sample_plan()
    clips = {
        "clip-001": _make_clip("clip-001", order=0),
        "clip-002": _make_clip("clip-002", order=1),
        "clip-003": _make_clip("clip-003", order=2),
        "clip-004": _make_clip("clip-004", order=3),
    }
    stub_plan_repo = StubEditPlanRepository({plan.id: plan})
    stub_clip_repo = StubEditPlanClipRepository(clips)

    original_plan_repo = service_module.SQLAlchemyEditPlanRepository
    original_clip_repo = service_module.SQLAlchemyEditPlanClipRepository
    original_gen_repo = service_module.SQLAlchemyGenerationTaskRepository
    service_module.SQLAlchemyEditPlanRepository = lambda db: stub_plan_repo
    service_module.SQLAlchemyEditPlanClipRepository = lambda db: stub_clip_repo
    service_module.SQLAlchemyGenerationTaskRepository = lambda db: MagicMock()

    app = FastAPI()
    app.include_router(router, prefix="/api/v1/edit-plans")

    # Mock 认证
    def _mock_auth():
        mock = MagicMock()
        mock.user.id = "user-001"
        return mock

    # Mock 项目访问检查
    import app.api.routes._helpers as helpers_module

    original_check = helpers_module.check_project_access
    helpers_module.check_project_access = lambda *a, **kw: None

    # 覆盖依赖
    from app.api.routes import edit_plans as main_module

    app.dependency_overrides[main_module.get_current_user] = _mock_auth
    app.dependency_overrides[main_module.get_db_session] = lambda: MagicMock()
    app.dependency_overrides[main_module.get_project_repository] = lambda: MagicMock()

    app.dependency_overrides[transitions_module.get_current_user] = _mock_auth
    app.dependency_overrides[transitions_module.get_db_session] = lambda: MagicMock()
    app.dependency_overrides[transitions_module.get_project_repository] = lambda: MagicMock()

    def cleanup():
        service_module.SQLAlchemyEditPlanRepository = original_plan_repo
        service_module.SQLAlchemyEditPlanClipRepository = original_clip_repo
        service_module.SQLAlchemyGenerationTaskRepository = original_gen_repo
        helpers_module.check_project_access = original_check

    return app, stub_plan_repo, stub_clip_repo, cleanup


@pytest.fixture
def transition_client():
    app, plan_repo, clip_repo, cleanup = _create_test_app()
    yield TestClient(app), plan_repo, clip_repo
    cleanup()


# ---------------------------------------------------------------------------
# Transition Presets 测试
# ---------------------------------------------------------------------------


class TestTransitionPresets:
    def test_list_all_presets(self, transition_client):
        c, _, _ = transition_client
        resp = c.get("/api/v1/edit-plans/transition-presets")
        assert resp.status_code == 200
        data = resp.json()
        assert data["total"] == len(TRANSITION_PRESET_LIBRARY)
        assert data["total"] > 10
        first = data["items"][0]
        assert "id" in first
        assert "name" in first
        assert "category" in first
        assert "default_duration" in first
        assert "min_duration" in first
        assert "max_duration" in first

    def test_filter_by_category_fade(self, transition_client):
        c, _, _ = transition_client
        resp = c.get("/api/v1/edit-plans/transition-presets?category=fade")
        assert resp.status_code == 200
        data = resp.json()
        assert data["total"] >= 3
        for item in data["items"]:
            assert item["category"] == "fade"

    def test_filter_by_category_slide(self, transition_client):
        c, _, _ = transition_client
        resp = c.get("/api/v1/edit-plans/transition-presets?category=slide")
        assert resp.status_code == 200
        data = resp.json()
        assert data["total"] >= 4
        for item in data["items"]:
            assert item["category"] == "slide"

    def test_filter_by_keyword(self, transition_client):
        c, _, _ = transition_client
        resp = c.get("/api/v1/edit-plans/transition-presets?keyword=模糊")
        assert resp.status_code == 200
        data = resp.json()
        assert data["total"] > 0
        names = [item["name"] for item in data["items"]]
        assert any("模糊" in n for n in names)

    def test_filter_empty_result(self, transition_client):
        c, _, _ = transition_client
        resp = c.get("/api/v1/edit-plans/transition-presets?keyword=不存在的转场")
        assert resp.status_code == 200
        data = resp.json()
        assert data["total"] == 0

    def test_contains_none_transition(self, transition_client):
        c, _, _ = transition_client
        resp = c.get("/api/v1/edit-plans/transition-presets?category=basic")
        assert resp.status_code == 200
        data = resp.json()
        ids = [item["id"] for item in data["items"]]
        assert "transition_none" in ids


# ---------------------------------------------------------------------------
# PUT /clips/{clip_id}/transition 测试
# ---------------------------------------------------------------------------


class TestUpdateClipTransition:
    def test_set_fade_transition(self, transition_client):
        c, _, clip_repo = transition_client
        resp = c.put(
            "/api/v1/edit-plans/clips/clip-001/transition",
            json={"effect": "transition_fade", "duration": 0.8},
        )
        assert resp.status_code == 200
        data = resp.json()
        assert data["clip_id"] == "clip-001"
        assert data["effect"] == "fade"
        assert data["duration"] == 0.8

        clip = clip_repo.get("clip-001")
        assert clip.transition_effect == "fade"
        assert clip.transition_duration == 0.8

    def test_set_none_transition(self, transition_client):
        c, _, clip_repo = transition_client
        resp = c.put(
            "/api/v1/edit-plans/clips/clip-001/transition",
            json={"effect": "transition_none"},
        )
        assert resp.status_code == 200
        data = resp.json()
        assert data["effect"] == "cut"
        assert data["duration"] == 0.0

    def test_use_default_duration(self, transition_client):
        c, _, _ = transition_client
        # 不传 duration，使用预设默认值
        resp = c.put(
            "/api/v1/edit-plans/clips/clip-001/transition",
            json={"effect": "transition_fade"},
        )
        assert resp.status_code == 200
        data = resp.json()
        assert data["effect"] == "fade"
        assert data["duration"] > 0  # 使用默认值

    def test_invalid_effect(self, transition_client):
        c, _, _ = transition_client
        resp = c.put(
            "/api/v1/edit-plans/clips/clip-001/transition",
            json={"effect": "invalid_effect"},
        )
        assert resp.status_code == 400
        assert "无效的转场效果" in resp.json()["detail"]

    def test_clip_not_found(self, transition_client):
        c, _, _ = transition_client
        resp = c.put(
            "/api/v1/edit-plans/clips/clip-nonexist/transition",
            json={"effect": "transition_fade"},
        )
        assert resp.status_code == 404

    def test_negative_duration_422(self, transition_client):
        c, _, _ = transition_client
        resp = c.put(
            "/api/v1/edit-plans/clips/clip-001/transition",
            json={"effect": "transition_fade", "duration": -0.5},
        )
        assert resp.status_code == 422

    def test_duration_clamped_to_max(self, transition_client):
        c, _, clip_repo = transition_client
        # 传一个超过最大值的时长，应该被钳制
        resp = c.put(
            "/api/v1/edit-plans/clips/clip-001/transition",
            json={"effect": "transition_fade", "duration": 10.0},
        )
        assert resp.status_code == 200
        data = resp.json()
        # fade 最大 2.0s
        assert data["duration"] <= 2.0


# ---------------------------------------------------------------------------
# POST /{plan_id}/transitions/batch 测试
# ---------------------------------------------------------------------------


class TestBatchUpdateTransitions:
    def test_batch_all(self, transition_client):
        c, _, clip_repo = transition_client
        resp = c.post(
            "/api/v1/edit-plans/plan-001/transitions/batch",
            json={"effect": "transition_fade", "duration": 0.5, "apply_to": "all"},
        )
        assert resp.status_code == 200
        data = resp.json()
        assert data["updated_count"] == 4  # 4个片段

        for cid in ["clip-001", "clip-002", "clip-003", "clip-004"]:
            clip = clip_repo.get(cid)
            assert clip.transition_effect == "fade"
            assert clip.transition_duration == 0.5

    def test_batch_except_first(self, transition_client):
        c, _, clip_repo = transition_client
        resp = c.post(
            "/api/v1/edit-plans/plan-001/transitions/batch",
            json={"effect": "transition_fade", "apply_to": "except_first"},
        )
        assert resp.status_code == 200
        data = resp.json()
        assert data["updated_count"] == 3

        # 第一个不变
        assert clip_repo.get("clip-001").transition_effect == "cut"
        # 其余三个被更新
        for cid in ["clip-002", "clip-003", "clip-004"]:
            assert clip_repo.get(cid).transition_effect == "fade"

    def test_batch_except_last(self, transition_client):
        c, _, clip_repo = transition_client
        resp = c.post(
            "/api/v1/edit-plans/plan-001/transitions/batch",
            json={"effect": "transition_slideleft", "apply_to": "except_last"},
        )
        assert resp.status_code == 200
        data = resp.json()
        assert data["updated_count"] == 3

        # 最后一个不变
        assert clip_repo.get("clip-004").transition_effect == "cut"
        # 前三个被更新
        for cid in ["clip-001", "clip-002", "clip-003"]:
            assert clip_repo.get(cid).transition_effect == "slideleft"

    def test_batch_middle(self, transition_client):
        c, _, clip_repo = transition_client
        resp = c.post(
            "/api/v1/edit-plans/plan-001/transitions/batch",
            json={"effect": "transition_dissolve", "apply_to": "middle"},
        )
        assert resp.status_code == 200
        data = resp.json()
        assert data["updated_count"] == 2  # 4个片段，中间2个

        # 首尾不变
        assert clip_repo.get("clip-001").transition_effect == "cut"
        assert clip_repo.get("clip-004").transition_effect == "cut"
        # 中间被更新
        assert clip_repo.get("clip-002").transition_effect == "dissolve"
        assert clip_repo.get("clip-003").transition_effect == "dissolve"

    def test_batch_invalid_effect(self, transition_client):
        c, _, _ = transition_client
        resp = c.post(
            "/api/v1/edit-plans/plan-001/transitions/batch",
            json={"effect": "invalid"},
        )
        assert resp.status_code == 400

    def test_batch_plan_not_found(self, transition_client):
        c, _, _ = transition_client
        resp = c.post(
            "/api/v1/edit-plans/plan-nonexist/transitions/batch",
            json={"effect": "transition_fade"},
        )
        assert resp.status_code == 404

    def test_batch_invalid_apply_to(self, transition_client):
        c, _, _ = transition_client
        resp = c.post(
            "/api/v1/edit-plans/plan-001/transitions/batch",
            json={"effect": "transition_fade", "apply_to": "invalid"},
        )
        assert resp.status_code == 400

    def test_batch_none_transition(self, transition_client):
        c, _, clip_repo = transition_client
        # 先设一个转场
        c.post(
            "/api/v1/edit-plans/plan-001/transitions/batch",
            json={"effect": "transition_fade", "apply_to": "all"},
        )
        # 再全部设为无
        resp = c.post(
            "/api/v1/edit-plans/plan-001/transitions/batch",
            json={"effect": "transition_none", "apply_to": "all"},
        )
        assert resp.status_code == 200
        assert resp.json()["updated_count"] == 4

        for cid in ["clip-001", "clip-002", "clip-003", "clip-004"]:
            clip = clip_repo.get(cid)
            assert clip.transition_effect == "cut"
            assert clip.transition_duration == 0.0