"""Define API request, response, and persisted configuration models.

Envelope helpers keep every endpoint response shape consistent.
"""

from datetime import date, datetime
from enum import Enum
from typing import Any, Literal

from fastapi.encoders import jsonable_encoder
from fastapi.responses import JSONResponse
from pydantic import BaseModel, ConfigDict, Field, field_validator

ErrorCode = Literal[
    "unauthorized",
    "forbidden",
    "validation_error",
    "not_found",
    "setup_required",
    "rate_limited",
    "internal",
]


class ApiError(BaseModel):
    """Structured API failure details."""

    code: ErrorCode
    message: str


class ApiEnvelope(BaseModel):
    """Common success or failure response wrapper."""

    ok: bool
    data: Any | None
    error: ApiError | None


class StoredConfig(BaseModel):
    """Durable password and session invalidation state."""

    model_config = ConfigDict(extra="forbid")

    password_hash: str
    session_version: int = Field(ge=1)
    created_at: datetime
    updated_at: datetime


class LoginRequest(BaseModel):
    """Password login payload."""

    password: str = Field(min_length=1)


class ChangePasswordRequest(BaseModel):
    """Authenticated password rotation payload."""

    old_password: str = Field(min_length=1)
    new_password: str = Field(min_length=1)


class AuthenticatedData(BaseModel):
    """Authentication state returned after a session mutation."""

    authenticated: bool


class MeData(AuthenticatedData):
    """Public session status and discrete application name."""

    app_name: str


class HealthData(BaseModel):
    """Liveness information."""

    status: Literal["up"]
    time: datetime


class ReadyData(BaseModel):
    """Bootstrap and storage readiness information."""

    ready: bool
    data_writable: bool
    config_present: bool


class Result(str, Enum):
    """Outcome of a logged remedy; `pending` is excluded from stats."""

    worked = "worked"
    partial = "partial"
    failed = "failed"
    pending = "pending"


def normalize_emotions(values: list[str]) -> list[str]:
    """Lowercase, strip, drop blanks, and de-duplicate emotion labels."""

    out: list[str] = []
    seen: set[str] = set()
    for value in values:
        token = value.strip().lower()
        if token and token not in seen:
            seen.add(token)
            out.append(token)
    return out


def normalize_tags(values: list[str]) -> list[str]:
    """Lowercase, strip, collapse spaces to underscores, and de-duplicate."""

    out: list[str] = []
    seen: set[str] = set()
    for value in values:
        token = "_".join(value.strip().lower().split())
        if token and token not in seen:
            seen.add(token)
            out.append(token)
    return out


class CoachMeta(BaseModel):
    """Coach reply metadata persisted on an entry."""

    text: str | None = None
    source: str | None = None
    model: str | None = None
    ts: datetime | None = None
    trace_id: str | None = None


WalkType = Literal["interrupt", "fantasy", "mixed"]


class EntryCreate(BaseModel):
    """Validated payload for creating a log entry."""

    model_config = ConfigDict(extra="forbid")

    activity: str = Field(min_length=1, max_length=500)
    happened: str = Field(min_length=1, max_length=4000)
    emotions: list[str] = Field(default_factory=list, max_length=12)
    intensity: int = Field(ge=1, le=10)
    remedy: str = Field(default="", max_length=2000)
    result: Result
    tags: list[str] = Field(default_factory=list, max_length=20)
    notes: str = Field(default="", max_length=2000)
    ts: datetime | None = None
    fse_spike: bool | None = None
    avoidance_types: list[str] = Field(default_factory=list, max_length=20)
    proof_brick: str | None = Field(default=None, max_length=80)
    walk_type: WalkType | None = None

    @field_validator("activity", "happened", mode="after")
    @classmethod
    def _strip_required(cls, value: str) -> str:
        stripped = value.strip()
        if not stripped:
            raise ValueError("must not be blank")
        return stripped

    @field_validator("remedy", "notes", mode="after")
    @classmethod
    def _strip_optional(cls, value: str) -> str:
        return value.strip()

    @field_validator("proof_brick", mode="after")
    @classmethod
    def _strip_proof(cls, value: str | None) -> str | None:
        if value is None:
            return None
        stripped = value.strip()
        return stripped or None

    @field_validator("emotions", mode="after")
    @classmethod
    def _clean_emotions(cls, value: list[str]) -> list[str]:
        return normalize_emotions(value)

    @field_validator("tags", "avoidance_types", mode="after")
    @classmethod
    def _clean_tags(cls, value: list[str]) -> list[str]:
        return normalize_tags(value)


class EntryUpdate(BaseModel):
    """Partial update payload; only provided fields are applied."""

    model_config = ConfigDict(extra="forbid")

    activity: str | None = Field(default=None, min_length=1, max_length=500)
    happened: str | None = Field(default=None, min_length=1, max_length=4000)
    emotions: list[str] | None = Field(default=None, max_length=12)
    intensity: int | None = Field(default=None, ge=1, le=10)
    remedy: str | None = Field(default=None, max_length=2000)
    result: Result | None = None
    tags: list[str] | None = Field(default=None, max_length=20)
    notes: str | None = Field(default=None, max_length=2000)
    ts: datetime | None = None
    fse_spike: bool | None = None
    avoidance_types: list[str] | None = Field(default=None, max_length=20)
    proof_brick: str | None = Field(default=None, max_length=80)
    walk_type: WalkType | None = None

    @field_validator("activity", "happened", mode="after")
    @classmethod
    def _strip_required(cls, value: str | None) -> str | None:
        if value is None:
            return None
        stripped = value.strip()
        if not stripped:
            raise ValueError("must not be blank")
        return stripped

    @field_validator("remedy", "notes", mode="after")
    @classmethod
    def _strip_optional(cls, value: str | None) -> str | None:
        return value.strip() if value is not None else None

    @field_validator("proof_brick", mode="after")
    @classmethod
    def _strip_proof(cls, value: str | None) -> str | None:
        if value is None:
            return None
        stripped = value.strip()
        return stripped or None

    @field_validator("emotions", mode="after")
    @classmethod
    def _clean_emotions(cls, value: list[str] | None) -> list[str] | None:
        return normalize_emotions(value) if value is not None else None

    @field_validator("tags", "avoidance_types", mode="after")
    @classmethod
    def _clean_tags(cls, value: list[str] | None) -> list[str] | None:
        return normalize_tags(value) if value is not None else None


class Entry(BaseModel):
    """A persisted log entry as stored on one JSONL line."""

    model_config = ConfigDict(extra="ignore")

    id: str
    ts: datetime
    created_at: datetime
    updated_at: datetime
    activity: str
    happened: str
    emotions: list[str] = Field(default_factory=list)
    intensity: int = Field(ge=1, le=10)
    remedy: str = ""
    result: Result
    tags: list[str] = Field(default_factory=list)
    notes: str = ""
    fse_spike: bool | None = None
    avoidance_types: list[str] = Field(default_factory=list)
    proof_brick: str | None = None
    walk_type: WalkType | None = None
    coach: CoachMeta = Field(default_factory=CoachMeta)


class EntryListData(BaseModel):
    """Paginated entry listing with total match count."""

    items: list[Entry]
    total: int
    limit: int
    offset: int


class DeletedData(BaseModel):
    """Confirmation payload for a hard delete."""

    deleted: bool
    id: str


class PrimaryBrick(str, Enum):
    """Daily primary brick label."""

    A = "A"
    B = "B"
    C = "C"
    D = "D"
    E = "E"
    S = "S"
    none = "none"


class Daydream(str, Enum):
    """Daily daydream status."""

    none = "none"
    done = "done"
    fc = "fc"


class Rerun(str, Enum):
    """Daily rerun status."""

    clean = "clean"
    R = "R"


class Court(str, Enum):
    """Daily court status."""

    closed = "closed"
    court = "court"


# P1 labels + legacy kinds kept so old Daily rows still validate.
ProofBrickKind = Literal[
    "interrupt_walk",
    "body_or_room",
    "trip_admin",
    "earn",
    "boundary",
    "food",
    "survive",
    "other",
    # legacy
    "leave_room",
    "admin_line",
    "send_message",
    "body_care",
]


class DailyUpsert(BaseModel):
    """Client payload for upserting a daily scoreboard row."""

    model_config = ConfigDict(extra="forbid")

    primary_brick: PrimaryBrick = PrimaryBrick.none
    brick_done: bool = False
    corn_sessions: int = Field(default=0, ge=0, le=50)
    delay_ok: bool = True
    daydream: Daydream = Daydream.none
    rerun: Rerun = Rerun.clean
    court: Court = Court.closed
    stayed_indoors_all_day: bool = False
    left_room: bool = False
    left_home: bool = False
    movement_minutes: int = Field(default=0, ge=0, le=24 * 60)
    interrupt_walk_minutes: int = Field(default=0, ge=0, le=24 * 60)
    fantasy_walk_minutes: int = Field(default=0, ge=0, le=24 * 60)
    headphones_on_walk: bool = False
    music_cinematic_on_walk: bool = False
    proof_brick_done: bool = False
    proof_brick_kind: ProofBrickKind | None = None
    fantasy_minutes_scheduled: int = Field(default=0, ge=0, le=24 * 60)
    fantasy_minutes_unplanned: int = Field(default=0, ge=0, le=24 * 60)
    note: str = Field(default="", max_length=2000)
    win: str = Field(default="", max_length=2000)

    @field_validator("note", "win", mode="after")
    @classmethod
    def _strip_note(cls, value: str) -> str:
        return value.strip()


class DailyRow(BaseModel):
    """A persisted daily scoreboard row; points are server-authoritative."""

    model_config = ConfigDict(extra="ignore")

    date: date
    primary_brick: PrimaryBrick = PrimaryBrick.none
    brick_done: bool = False
    corn_sessions: int = Field(default=0, ge=0, le=50)
    delay_ok: bool = True
    daydream: Daydream = Daydream.none
    rerun: Rerun = Rerun.clean
    court: Court = Court.closed
    stayed_indoors_all_day: bool = False
    left_room: bool = False
    left_home: bool = False
    movement_minutes: int = Field(default=0, ge=0, le=24 * 60)
    interrupt_walk_minutes: int = Field(default=0, ge=0, le=24 * 60)
    fantasy_walk_minutes: int = Field(default=0, ge=0, le=24 * 60)
    headphones_on_walk: bool = False
    music_cinematic_on_walk: bool = False
    proof_brick_done: bool = False
    proof_brick_kind: ProofBrickKind | None = None
    fantasy_minutes_scheduled: int = Field(default=0, ge=0, le=24 * 60)
    fantasy_minutes_unplanned: int = Field(default=0, ge=0, le=24 * 60)
    points: int = Field(ge=0, le=6)
    note: str = ""
    win: str = ""
    updated_at: datetime


class DailyRangeData(BaseModel):
    """Daily rows for a date range plus week band summary."""

    items: list[DailyRow]
    week_points: int
    band: Literal["incomplete", "strong", "mixed", "escape_heavy"]
    days_present: int


class CoachRequest(BaseModel):
    """Coach request: free text and/or entry id."""

    model_config = ConfigDict(extra="forbid")

    text: str | None = None
    entry_id: str | None = None
    include_history: int | None = Field(default=None, ge=0, le=50)
    persist: bool = False
    force_backup: bool = False


class CoachResponseData(BaseModel):
    """Coach reply always includes text and source."""

    text: str
    source: Literal["model", "backup", "model_unparsed_fallback"]
    model: str | None = None
    trace_id: str
    flags: list[str] = Field(default_factory=list)
    server_picks: list[dict[str, Any]] = Field(default_factory=list)
    parsed: dict[str, str] | None = None


class SettingsStatusData(BaseModel):
    """Authenticated settings status without secrets."""

    app_name: str
    app_version: str
    coach_configured: bool
    model: str
    data_ok: bool
    env: str


def ok(data: BaseModel | dict[str, Any] | list[Any]) -> dict[str, Any]:
    """Build a JSON-serializable success envelope."""

    return jsonable_encoder(ApiEnvelope(ok=True, data=data, error=None))


def err(code: ErrorCode, message: str, status_code: int) -> JSONResponse:
    """Build a consistent failure response."""

    payload = ApiEnvelope(
        ok=False,
        data=None,
        error=ApiError(code=code, message=message),
    )
    return JSONResponse(status_code=status_code, content=jsonable_encoder(payload))