from __future__ import annotations

"""方案校验结果模型：PlanValidationResult包含问题清单、预算估算与修改意见。"""

from typing import Literal

from pydantic import Field

from app.schemas.common import AppModel


ValidationSeverity = Literal[
    "error",
    "warning",
]

BudgetStatus = Literal[
    "within_known_budget",
    "over_budget",
    "unknown",
]


class ValidationIssue(AppModel):
    """行程校验发现的单个问题。"""

    code: str
    severity: ValidationSeverity
    message: str

    day_index: int | None = None
    activity_sequence: int | None = None


class BudgetEstimate(AppModel):
    """当前能够确定的预算估算。

    航班仍标记为接口报价，不擅自解释为
    单人价格或全部旅客总价。
    """

    currency: str = "CNY"

    flight_quote: float | None = Field(
        default=None,
        ge=0,
    )

    hotel_estimate: float | None = Field(
        default=None,
        ge=0,
    )

    explicit_activity_costs: float = Field(
        default=0,
        ge=0,
    )

    known_total: float | None = Field(
        default=None,
        ge=0,
    )

    user_budget: float | None = Field(
        default=None,
        ge=0,
    )

    remaining_known_budget: float | None = None

    status: BudgetStatus = "unknown"

    coverage_note: str


class PlanValidationResult(AppModel):
    """确定性校验阶段的完整结果。"""

    is_valid: bool

    error_count: int = Field(ge=0)
    warning_count: int = Field(ge=0)

    issues: list[ValidationIssue] = Field(
        default_factory=list
    )

    budget: BudgetEstimate

    # 后续Supervisor将这些信息交给Planner重写。
    revision_feedback: list[str] = Field(
        default_factory=list
    )