"""将物料默认配置补入新增动作，并检查动作是否符合规划，不执行画布更新"""

from copy import deepcopy
from math import isclose

from app.processor.state import QueryState
from app.schemas.action_validation import ActionValidationError
from app.schemas.actions import (
    ActionBatch,
    AddAction,
    DeleteAction,
    MoveAction,
    ResizeAction,
    UpdateAction,
    UpdateCanvasAction,
)
from app.schemas.capabilities import DATA_BINDING_ERROR, DATA_BINDING_SUPPORTED
from app.schemas.component_resource import ComponentDefinition
from app.schemas.operations import PLAN_ADJUST_OPERATIONS, is_canvas_operation
from app.schemas.screen import Screen, ScreenNode
from app.schemas.screen_plan import PlanComponent


def plan_block_reason(state: QueryState) -> str | None:
    """检查规划是否在当前支持范围内，不支持时返回原因"""

    # 获取当前规划和组件目录，后续分别检查操作范围与新增物料能力
    plan = state["screen_plan"]
    resources = state["component_resources"]

    # 如果需求尚未明确，不能根据规划直接生成动作
    if state["requirement"].needs_clarification:
        return "需求尚未澄清，不能生成规划动作"

    # 如果规划仍依赖待获取的资源，先阻止动作生成
    if plan.resource_needs:
        return "规划仍有待获取资源，不能直接生成动作"

    # 分别收集新增、删除和修改目标，保留组件不算可执行变更
    additions = [item for item in plan.components if item.disposition == "add"]
    removals = {
        item.target_id for item in plan.components if item.disposition == "remove"
    }
    modifications = {
        item.target_id: item for item in plan.components if item.disposition == "modify"
    }

    # 如果没有任何组件或画布变更，则没有可转换为动作的规划内容
    if not additions and not modifications and not removals and not plan.canvas_changes:
        return "规划未包含可执行的组件或画布修改"

    # 收集目录支持的类型，拒绝规划虚构前端未注册的新增组件类型
    supported = {item.type for item in resources.components}
    if any(item.component_type not in supported for item in additions):
        return "规划中的新增类型未在组件目录中找到"

    # 按 ID 索引原大屏节点，检查已有目标是否存在及类型是否保持一致
    nodes = {node.id: node for node in state["input_context"].screen.nodes}
    for item in plan.components:
        # 新增组件没有已有目标，不参与下面的已有节点检查
        if item.disposition == "add":
            continue

        # 保留、修改和删除都必须指向真实存在的节点
        if item.target_id not in nodes:
            return f"规划目标不存在: {item.target_id}"

        # 如果规划显式指定类型，必须与已有节点相同，不能借修改操作更换类型
        if (
            item.component_type is not None
            and item.component_type != nodes[item.target_id].type
        ):
            return "当前不支持更换已有组件类型"

    # 已有目标的修改诉求不能通过 keep 或遗漏目标绕过
    supported_operations = set(PLAN_ADJUST_OPERATIONS)
    changes = state["requirement"].changes

    # 删除必须逐个目标获得明确授权，整体布局调整不隐含删除权限
    allowed_removals = {
        target
        for change in changes
        if change.target_scope == "nodes" and change.operation == "delete"
        for target in change.target_ids
    }

    # 规划删除集合必须与需求完全一致，既不能多删，也不能漏删
    if removals != allowed_removals:
        return "规划删除目标与需求不一致，不能遗漏或扩大删除范围"

    # 逐项核对需求是否被规划覆盖，任一不支持的需求都会阻止整批生成
    for change in changes:
        # 画布更新需求必须对应非空的画布变更规划
        if is_canvas_operation(change.target_scope, change.operation):
            if not plan.canvas_changes:
                return "规划遗漏画布修改需求"
        elif change.target_scope == "screen" and change.operation == "add":
            # 新增需求至少需要一个新增组件规划
            if not additions:
                return "规划遗漏新增需求"
        elif change.target_scope == "nodes" and change.operation == "delete":
            # 删除目标已在上面通过集合相等检查，此处不重复处理
            continue
        elif (
            change.target_scope in {"nodes", "screen"}
            and change.operation in supported_operations
        ):
            # 调整需求必须有修改规划，并覆盖需求中明确指定的全部目标
            if not modifications or any(
                target not in modifications for target in change.target_ids
            ):
                return "规划遗漏需要调整的组件"
        else:
            return "需求包含未支持的操作，当前不能只执行部分规划"

    # 没有整体调整需求时，已有组件的修改目标只能来自需求明确列出的 ID
    if (
        modifications
        and changes
        and not any(
            change.target_scope == "screen" and change.operation in supported_operations
            for change in changes
        )
    ):
        # 汇总需求目标，检查规划是否额外修改了其他组件
        allowed = {target for change in changes for target in change.target_ids}
        if set(modifications) - allowed:
            return "规划调整了需求范围外的组件"

    # 所有能力和范围检查通过，None 表示没有阻塞原因
    return None


def plan_materials(state: QueryState) -> list[dict]:
    """提取规划需要的完整物料配置，供动作生成和修正使用"""

    # 只收集新增组件所需的类型，使用集合去除重复类型
    types = {
        item.component_type
        for item in state["screen_plan"].components
        if item.disposition == "add"
    }

    # 如果没有新增组件，就不需要向模型提供物料配置
    if not types:
        return []

    # 按类型提取全部匹配物料，使用协议别名输出 schema 等字段
    return [
        item.model_dump(mode="json", by_alias=True)
        for item in state["component_resources"].components
        if item.type in types
    ]


def merge_config(defaults: dict, overrides: dict) -> dict:
    # 对象逐层覆盖，数组和标量整体替换，不修改目录或模型输出
    result = deepcopy(defaults)

    # 逐项合并覆盖值，双方都是字典时递归，否则用新值的深拷贝整体替换
    for key, value in overrides.items():
        result[key] = (
            merge_config(result[key], value)
            if isinstance(result.get(key), dict) and isinstance(value, dict)
            else deepcopy(value)
        )

    # 返回独立配置，保留未被覆盖的默认字段
    return result


def assemble_plan_actions(state: QueryState, batch: ActionBatch) -> ActionBatch:
    """用物料默认配置补全新增节点，模型显式提供的字段优先"""

    # 按物料编号建立索引，动作通过 component_key 选择具体预设
    materials = {item.key: item for item in state["component_resources"].components}

    # 复制整批动作，补全配置时不改动调用方提供的动作对象
    result = batch.model_copy(deep=True)
    for action in result.actions:
        # 非新增动作或找不到物料时不补全，物料合法性由规划动作校验负责
        if not isinstance(action, AddAction) or action.component_key not in materials:
            continue

        # 获取所选物料，仅用模型显式提供的节点字段覆盖默认配置
        material = materials[action.component_key]
        node = merge_config(
            material.schema_.model_dump(mode="json"),
            action.node.model_dump(mode="json", exclude_unset=True),
        )

        # 对合并后的完整节点重新校验，防止默认配置与覆盖值组合后不合法
        action.node = ScreenNode.model_validate(node)
        # 保守标记物料含示例数据，不能由模型声称已取得真实数据
        action.sample_data = material.sample_data

    return result


def _validate_canvas_action(
    action: UpdateCanvasAction, planned_fields: set[str], covered_fields: set[str]
) -> str | None:
    """检查画布字段范围，通过后记录已覆盖字段，最终值在执行后检查"""

    # 找出动作包含但规划未允许的顶层画布字段
    if extra := set(action.properties) - planned_fields:
        return f"不能修改规划外的画布字段: {sorted(extra)}"

    # 累计本动作覆盖的字段，供整批检查是否遗漏规划内容
    covered_fields.update(action.properties)

    return None


def _validate_delete_action(
    action: DeleteAction, planned_ids: set[str], removed_ids: set[str]
) -> str | None:
    """只允许删除 remove 目标，通过后记录目标以防重复删除"""
    # 如果目标未被规划标记为删除，拒绝该动作
    if action.target_id not in planned_ids:
        return f"不能删除非 remove 规划目标: {action.target_id}"

    # 如果前面的动作已经删除该目标，拒绝重复删除
    if action.target_id in removed_ids:
        return f"不能重复删除组件: {action.target_id}"

    # 记录本次已覆盖的删除目标，同时用于后续重复和遗漏检查
    removed_ids.add(action.target_id)

    return None


def _validate_modify_action(
    action: MoveAction | ResizeAction | UpdateAction,
    planned: dict[str, PlanComponent],
    modified_ids: set[str],
) -> str | None:
    """只允许调整 modify 目标，属性更新还需规划中有设计要求"""
    # 修改目标必须在 modify 规划中，不能修改 keep 或未提及的组件
    if action.target_id not in planned:
        return f"不能修改保留或未提及的组件: {action.target_id}"

    # 属性更新还需要明确的设计内容，单纯布局规划不能授权任意属性修改
    if isinstance(action, UpdateAction) and not planned[action.target_id].design:
        return f"规划未要求修改属性: {action.target_id}"

    # 记录已覆盖的修改目标，同一组件可以由多条移动、尺寸或属性动作共同完成
    modified_ids.add(action.target_id)

    return None


def _validate_add_action(
    action: AddAction,
    planned: dict[str, PlanComponent],
    materials: dict[str, ComponentDefinition],
    existing_ids: set[str],
    seen_plan_ids: set[str],
) -> str | None:
    """检查新增规划关联、ID、物料类型、布局及数据标记"""
    # 新增动作必须关联有效的新增规划编号
    if action.plan_id not in planned:
        return f"动作未关联有效的新增规划: {action.plan_id}"

    # 同一新增规划只能生成一个组件，防止重复新增
    if action.plan_id in seen_plan_ids:
        return f"同一规划组件不能重复新增: {action.plan_id}"

    # 新组件不能复用原大屏已有的节点 ID
    if action.node.id in existing_ids:
        return f"新增组件不能复用原有 ID: {action.node.id}"

    # 关联有效即记录出现，后续配置错误单独报告，不再重复报遗漏
    seen_plan_ids.add(action.plan_id)

    # 获取关联规划与具体物料，核对三者声明的组件类型
    item = planned[action.plan_id]
    material = materials.get(action.component_key)

    if (
        material is None
        or material.type != item.component_type
        or action.node.type != item.component_type
    ):
        return "新增节点类型、物料和规划类型不一致"
    # 如果规划已明确新增布局，动作必须完整沿用该布局
    if item.layout is not None and action.node.layout != item.layout:
        return f"新增布局与规划不一致: {item.plan_id}"

    # 示例数据标记必须与物料一致，不能将示例内容标记为真实业务数据
    if action.sample_data != material.sample_data:
        return "示例数据标记与物料不一致"

    # 当前没有数据绑定能力，拒绝新增节点携带非空的扩展 dataId
    if not DATA_BINDING_SUPPORTED and action.node.model_extra.get("dataId"):
        return DATA_BINDING_ERROR

    return None


def validate_plan_actions(
    state: QueryState, batch: ActionBatch
) -> list[ActionValidationError]:
    """检查动作是否覆盖规划，禁止修改 keep 或未提及的组件"""
    # 先检查规划是否可执行，不支持时直接返回原因
    if reason := plan_block_reason(state):
        return [ActionValidationError(code="scope_error", message=reason)]

    # 新增动作通过 plan_id 查找对应规划
    expected = {
        item.plan_id: item
        for item in state["screen_plan"].components
        if item.disposition == "add"
    }

    # 修改动作通过已有组件 ID 查找对应规划
    modifications = {
        item.target_id: item
        for item in state["screen_plan"].components
        if item.disposition == "modify"
    }

    # 物料按 key 索引，用于核对新增组件的类型和示例数据标记
    materials = {item.key: item for item in state["component_resources"].components}
    seen: set[str] = set()  # 已关联的新增规划编号
    modified: set[str] = set()  # 已覆盖的修改目标

    # 只有规划标为 remove 的组件才允许删除
    removals = {
        item.target_id
        for item in state["screen_plan"].components
        if item.disposition == "remove"
    }

    removed: set[str] = set()  # 已覆盖的删除目标
    canvas_fields: set[str] = set()  # 已覆盖的画布字段
    planned_canvas = state[
        "screen_plan"
    ].canvas_changes  # 规划要求修改的画布字段及最终值

    # 累计所有动作及覆盖范围错误，便于一次性反馈给修正流程
    errors = []

    # 保存原有组件 ID，防止新增组件复用已有 ID
    existing_ids = {node.id for node in state["input_context"].screen.nodes}
    # 按顺序校验每个动作，保留索引以便定位错误
    for index, action in enumerate(batch.actions):
        if isinstance(action, UpdateCanvasAction):
            # 检查画布字段是否超出规划，并记录已覆盖字段
            message = _validate_canvas_action(
                action, set(planned_canvas), canvas_fields
            )
        elif isinstance(action, DeleteAction):
            # 检查删除目标是否允许、是否重复，并记录已删除目标
            message = _validate_delete_action(action, removals, removed)
        elif isinstance(action, AddAction):
            # 核对新增规划、ID、物料和布局，并记录已关联的规划编号
            message = _validate_add_action(
                action, expected, materials, existing_ids, seen
            )
        elif isinstance(action, (MoveAction, ResizeAction, UpdateAction)):
            # 检查目标是否允许修改，更新属性时还需有设计要求
            message = _validate_modify_action(action, modifications, modified)
        else:
            # 未接入规划校验的动作返回错误，避免静默放行
            message = "规划调整仅支持 move、resize 和 update"
        if message:
            # 将错误与动作索引关联，继续收集其余动作的问题
            errors.append(
                ActionValidationError(
                    action_index=index, code="scope_error", message=message
                )
            )

    # 逐条合法还不够，整批动作必须覆盖全部规划目标
    for label, missing in (
        ("新增规划组件", set(expected) - seen),
        ("调整规划组件", set(modifications) - modified),
        ("删除规划组件", removals - removed),
        ("画布规划字段", set(planned_canvas) - canvas_fields),
    ):
        if missing:
            # 遗漏属于整批动作的问题，不关联某一条动作索引
            errors.append(
                ActionValidationError(
                    code="scope_error", message=f"遗漏{label}: {sorted(missing)}"
                )
            )

    # 返回全部校验问题，空列表表示动作范围和覆盖检查通过
    return errors


def validate_plan_result(
    state: QueryState, screen: Screen
) -> list[ActionValidationError]:
    """检查整批执行后的组件布局和画布属性是否达到规划要求"""

    # 按节点 ID 索引模拟执行结果，便于读取每个修改目标的最终布局
    nodes = {node.id: node for node in screen.nodes}
    # 只核对明确提供布局的修改规划，收集最终布局未达到要求的目标
    errors = [
        ActionValidationError(
            code="scope_error", message=f"执行后的布局与规划不一致: {item.target_id}"
        )
        for item in state["screen_plan"].components
        if item.disposition == "modify"
        and item.layout is not None
        and not all(
            # 坐标和尺寸允许极小的浮点误差，避免加减计算造成误报
            isclose(
                getattr(nodes[item.target_id].layout, key),
                value,
                rel_tol=0,
                abs_tol=1e-9,
            )
            if key in {"x", "y", "width", "height"}
            # 其他布局字段按值精确比较，不使用数值容差
            else nodes[item.target_id].layout.model_dump().get(key) == value
            for key, value in item.layout.model_dump().items()
        )
    ]

    # 将执行后的画布转成字典，逐项核对规划要求的最终属性值
    canvas = screen.canvas.model_dump()
    for key, value in state["screen_plan"].canvas_changes.items():
        # 字段缺失或最终值不一致都视为未达到规划要求
        if key not in canvas or canvas[key] != value:
            errors.append(
                ActionValidationError(
                    code="scope_error", message=f"执行后的画布属性与规划不一致: {key}"
                )
            )

    # 返回布局及画布结果错误，空列表表示这些最终值符合规划
    return errors