"""Pydantic models for world artifacts, runtime state, claims, and events.

These mirror the YAML frontmatter / JSON shapes described in PLAN.md sections
6, 7, and 8. Artifacts are authored as markdown-with-frontmatter; these models
validate the machine-readable parts after parsing.
"""

from __future__ import annotations

from datetime import UTC, datetime
from enum import StrEnum
from typing import Any, Literal

from pydantic import BaseModel, Field


def utcnow_iso() -> str:
    """ISO-8601 UTC timestamp used across ledgers and events."""
    return datetime.now(UTC).isoformat()


# --------------------------------------------------------------------------
# World artifacts (Section 6)
# --------------------------------------------------------------------------


class TimelineSlice(BaseModel):
    """One row of the structured movement schedule — the spine of the case."""

    time_slice: str
    character: str
    location: str
    action: str
    observed_by: list[str] = Field(default_factory=list)


class Timeline(BaseModel):
    slices: list[TimelineSlice] = Field(default_factory=list)

    def for_character(self, name: str) -> list[TimelineSlice]:
        return [s for s in self.slices if s.character == name]

    def slice_by_id(self, time_slice: str) -> list[TimelineSlice]:
        return [s for s in self.slices if s.time_slice == time_slice]


class EnvObject(BaseModel):
    """An authored object/detail in the environment with its true state."""

    id: str
    location: str
    description_true: str
    evidential: bool = False
    clue: str | None = None
    visible_by_default: bool = True


class ClueNode(BaseModel):
    """A discoverable clue node with unlock dependencies and exonerations."""

    id: str
    reveals: str
    sources: list[str] = Field(default_factory=list)
    unlocks: list[str] = Field(default_factory=list)
    exonerates: list[str] = Field(default_factory=list)
    required_for_solution: bool = False
    # Optional prerequisites; if absent, derived from other nodes' `unlocks`.
    requires: list[str] = Field(default_factory=list)


CrackBehavior = Literal[
    "deflect", "silence", "anger", "lawyer_up", "leave", "partial_confess"
]
SecretKind = Literal["guilty", "innocent"]
Role = Literal["victim", "suspect", "witness", "accomplice"]


class KnowledgeBoundary(BaseModel):
    witnessed: list[str] = Field(default_factory=list)
    topics_known: list[str] = Field(default_factory=list)
    topics_unknowable: list[str] = Field(default_factory=list)


class CharacterCard(BaseModel):
    """Full character model. Frontmatter (machine) + prose (voice)."""

    name: str
    role: Role = "suspect"
    guilty: bool = False

    truth: str = ""
    knows: KnowledgeBoundary = Field(default_factory=KnowledgeBoundary)
    cover: str = ""

    never_admit: list[str] = Field(default_factory=list)
    cracks_when: str = ""
    crack_behavior: CrackBehavior = "deflect"
    tells: list[str] = Field(default_factory=list)
    secret_kind: SecretKind = "guilty"
    exoneration: str | None = None

    # Prose voice section (after frontmatter).
    voice: str = ""


class Alibi(BaseModel):
    """A pre-authored shared lie rehearsed by accomplices."""

    id: str
    characters: list[str] = Field(default_factory=list)
    agreed_facts: str = ""
    agreed_timeline: str = ""
    cover_per_character: dict[str, str] = Field(default_factory=dict)
    # The points where the alibi is actually false vs. the real timeline.
    seams: list[str] = Field(default_factory=list)
    body: str = ""


class Solution(BaseModel):
    """GROUND TRUTH. Engine-only; never shown to the player pre-accusation."""

    culprit: str
    means: str
    motive: str
    opportunity: str
    true_sequence: str = ""
    body: str = ""


class WorldMeta(BaseModel):
    world_id: str
    created: str = Field(default_factory=utcnow_iso)
    seed: str = ""
    one_line: str = ""
    setting: str = ""
    twist_tag: str = ""
    play_count: int = 0
    title: str = ""


# --------------------------------------------------------------------------
# Runtime state (Section 7)
# --------------------------------------------------------------------------

Polarity = Literal["affirm", "deny", "neutral"]
TruthValue = Literal["true", "false", "unknown"]


class Claim(BaseModel):
    """A structured proposition extracted from a character utterance."""

    claim_id: str
    topic: str
    proposition: str
    turn: int
    polarity: Polarity = "neutral"
    engine_truth_value: TruthValue = "unknown"


class LedgerEntry(BaseModel):
    """One committed utterance: verbatim + structured claims."""

    turn: int
    raw: str
    claims: list[Claim] = Field(default_factory=list)
    ts: str = Field(default_factory=utcnow_iso)


class CharacterLedger(BaseModel):
    character: str
    entries: list[LedgerEntry] = Field(default_factory=list)

    @property
    def claims(self) -> list[Claim]:
        out: list[Claim] = []
        for e in self.entries:
            out.extend(e.claims)
        return out


class TranscriptEvent(BaseModel):
    """One ordered line in the session transcript."""

    turn: int
    kind: Literal[
        "player",
        "character",
        "world",
        "crack",
        "confront",
        "accuse",
        "system",
    ]
    actor: str = ""           # character/world name, or "player"
    text: str
    ts: str = Field(default_factory=utcnow_iso)
    meta: dict[str, Any] = Field(default_factory=dict)


class SessionStatus(StrEnum):
    active = "active"
    solved = "solved"
    closed = "closed"


class AccusationResult(BaseModel):
    culprit_named: str
    culprit_correct: bool
    means_supported: bool
    motive_supported: bool
    opportunity_supported: bool
    grade: Literal["solved", "right_culprit_unproven", "wrong"]
    debrief: str = ""
    missed_clues: list[str] = Field(default_factory=list)


class SessionState(BaseModel):
    session_id: str
    world_id: str
    started_at: str = Field(default_factory=utcnow_iso)
    status: SessionStatus = SessionStatus.active
    turn: int = 0
    discovered_clues: list[str] = Field(default_factory=list)
    cracked: list[str] = Field(default_factory=list)   # characters in crack state
    accusation: AccusationResult | None = None


# --------------------------------------------------------------------------
# Token ledger (Section 4)
# --------------------------------------------------------------------------


class UsageRecord(BaseModel):
    ts: str = Field(default_factory=utcnow_iso)
    world_id: str = ""
    session_id: str = ""
    task: str = ""
    tier: str = ""
    provider: str = ""
    model: str = ""
    prompt_tokens: int = 0
    completion_tokens: int = 0
    total_tokens: int = 0
    ok: bool = True
    retries: int = 0