"""
echo/agents/curator.py
----------------------
The Curator builds a child WorldState as a *causal consequence* of its parent.

It is the agent most responsible for the illusion that it's "the same you"
across branches: it receives the full branch narrative (root -> parent) plus
the chosen fork, and must produce a life that could plausibly have grown from
that history. It never invents from scratch.

Optionally consumes grounding facts from the research tool (real-world detail
for the chosen location/era) to kill vagueness.
"""

from __future__ import annotations

from typing import Optional

from .base import Agent, HOUSE_STYLE_WORLD, HOUSE_STYLE_VOICE
from ..core.world_state import WorldState, LifeFacts, EmotionalTone


_CURATOR_GOLD = (
    "GOLD EXAMPLE — match this texture and JSON shape, never reuse its content:\n"
    "{\n"
    '  "age": 41,\n'
    '  "location": "Porto, Portugal",\n'
    '  "occupation": "night-shift baker",\n'
    '  "relationships": ["divorced from Inês, still text on Sundays"],\n'
    '  "dependents": ["a son, Tomás, 9"],\n'
    '  "scars": ["the Lisbon bakery you lost to the bank"],\n'
    '  "triumphs": ["Tomás learned to swim this July"],\n'
    '  "possessions": ["a flour-dusted radio stuck on one station"],\n'
    '  "valence": -0.1,\n'
    '  "dominant_feeling": "tired tenderness",\n'
    '  "voice_hint": "low, even, a little hoarse before dawn",\n'
    '  "summary": "You are 41, in Porto, baking through the night so Tomás '
    'wakes to warm bread.",\n'
    '  "voice_line": "I lost the Lisbon shop and I lost her, but the boy ate '
    'warm bread this morning and never knew a thing."\n'
    "}\n\n"
    "The voice_line earns its weight from one concrete image. Never write the "
    "abstract version:\n"
    '  ✗ "It was hard, but it became a journey of self-discovery worth taking."\n'
    '  ✓ "...the boy ate warm bread this morning and never knew a thing."'
)


class Curator(Agent):
    SYSTEM = (
        HOUSE_STYLE_WORLD + "\n" + HOUSE_STYLE_VOICE + "\n"
        "You are the Curator. You grow ONE human life forward across alternate "
        "timelines. Given the branch history and the choice that now diverges "
        "this life, write the NEXT state as a believable causal consequence of "
        "the parent. The new age must equal the parent's age plus the years "
        "that pass. Respond ONLY as JSON with keys: age, location, occupation, "
        "relationships, dependents, scars, triumphs, possessions, valence, "
        "dominant_feeling, voice_hint, summary, voice_line.\n\n"
        + _CURATOR_GOLD
    )

    def grow(self, parent: WorldState, branch_narrative: str,
             chosen_fork: str, years: int,
             grounding: Optional[str] = None) -> WorldState:
        user = (
            f"BRANCH HISTORY (must stay consistent with all of this):\n"
            f"{branch_narrative}\n\n"
            f"PARENT FACTS: {parent.facts.constraints_text()}\n"
            f"PARENT EMOTION: {parent.tone.dominant_feeling} "
            f"(valence {parent.tone.valence})\n\n"
            f"THE CHOICE THAT NOW DIVERGES THIS LIFE: {chosen_fork}\n"
            f"YEARS THAT PASS: {years}\n"
        )
        if grounding:
            user += f"\nREAL-WORLD GROUNDING (use to add authentic detail):\n{grounding}\n"
        if parent.facts.location == "unknown" or parent.facts.occupation == "unknown":
            # Origin node: nothing is established yet. The model must INVENT a
            # concrete grounding rather than inherit the "unknown" placeholder.
            user += (
                "\nThis is the ORIGIN of the life — no location or occupation is "
                "fixed yet. Establish a SPECIFIC city and occupation that fit the "
                "diverging choice; do not write 'unknown'."
            )
        user += (
            "\nWrite the resulting life. The new age must equal parent age + "
            f"{years}. Make one big dramatic turn land — a triumph or a wound."
        )

        data = self._complete_json(user)
        return self._assemble(parent, chosen_fork, years, data)

    # ------------------------------------------------------------- assembly
    def _assemble(self, parent: WorldState, fork: str, years: int,
                  data: dict) -> WorldState:
        """Build a WorldState from model JSON, with safe fallbacks."""
        facts = LifeFacts(
            # Age is arithmetic, not generation: the tree's math must never be
            # at the mercy of a free-form model field. Always derive it.
            age=parent.facts.age + years,
            location=str(data.get("location", parent.facts.location)),
            occupation=str(data.get("occupation", parent.facts.occupation)),
            relationships=_as_list(data.get("relationships")),
            dependents=_as_list(data.get("dependents")),
            scars=_as_list(data.get("scars")) or list(parent.facts.scars),
            triumphs=_as_list(data.get("triumphs")),
            possessions=_as_list(data.get("possessions")),
        )
        tone = EmotionalTone(
            valence=float(data.get("valence", 0.0)),
            dominant_feeling=str(data.get("dominant_feeling", "uncertain")),
            voice_hint=str(data.get("voice_hint", "")),
        )
        return WorldState(
            node_id=WorldState.new_id(),
            parent_id=parent.node_id,
            depth=parent.depth + 1,
            divergence=fork,
            years_elapsed=years,
            facts=facts,
            tone=tone,
            summary=str(data.get("summary", "")),
            voice_line=str(data.get("voice_line", "")),
        )


def _as_list(v) -> list[str]:
    if v is None:
        return []
    if isinstance(v, list):
        return [str(x) for x in v]
    return [str(v)]