"""TinyWorld Crisis Mode — campaign state machine.

A *campaign* chains crises into a story ("Season 1 · The Long Summer"). Each
*chapter* wraps one crisis with narrative beats and a meta-mystery clue. The town
survives the campaign by keeping its Town Resilience above zero; the finale reveals
that the disasters were never random — the saboteur is the player.

This module is pure orchestration: it never calls the LLM itself. The UI computes
reactions with ``agents.react`` and hands them to :func:`resolve_round`, which keeps
the engine testable offline with scripted reactions.
"""

from dataclasses import dataclass, field

import crisis as crisis_mod
import world_state


# Resilience cost of finishing a crisis at each grade (a clean run barely dents it).
GRADE_COST = {"A": 0, "B": 3, "C": 7, "D": 12, "F": 25}


@dataclass
class Chapter:
    id: str
    crisis_id: str
    intro: str = ""
    outro_win: str = ""
    outro_loss: str = ""
    clue: str = ""


@dataclass
class Campaign:
    id: str
    title: str
    chapters: list = field(default_factory=list)
    finale_reveal: str = ""


# --------------------------------------------------------------------------- loading
def get_campaign_def(world):
    data = world.get("campaign")
    if not data:
        return None
    chapters = [Chapter(**ch) for ch in data.get("chapters", [])]
    return Campaign(
        id=data["id"],
        title=data["title"],
        chapters=chapters,
        finale_reveal=data.get("finale_reveal", ""),
    )


def current_chapter(world):
    camp = get_campaign_def(world)
    if not camp:
        return None
    idx = world_state.get_campaign(world["id"])["chapter_index"]
    if 0 <= idx < len(camp.chapters):
        return camp.chapters[idx]
    return None


def current_crisis(world):
    state = world_state.get_campaign(world["id"])
    if not state.get("crisis_id"):
        return None
    return crisis_mod.get_crisis(world, state["crisis_id"])


# --------------------------------------------------------------------------- lifecycle
def start(world):
    """Begin the campaign at chapter 1 and inject its crisis."""
    wid = world["id"]
    world_state.reset_campaign(wid)
    camp = get_campaign_def(world)
    if not camp or not camp.chapters:
        return view(world)
    first = camp.chapters[0]
    world_state.campaign_update(
        wid,
        active=True,
        campaign_id=camp.id,
        chapter_index=0,
        status="playing",
    )
    _inject(world, first)
    return view(world)


def _inject(world, chapter):
    wid = world["id"]
    world_state.campaign_update(
        wid,
        crisis_id=chapter.crisis_id,
        crisis_round=0,
        crisis_met=set(),
        last_dispatch="",
    )
    world_state.reset_chaos(wid)


def round_event_text(world):
    """The event string to feed agents this round (carries prior-round feedback)."""
    cr = current_crisis(world)
    if not cr:
        return ""
    state = world_state.get_campaign(world["id"])
    if state["crisis_round"] == 0:
        return crisis_mod.build_event_text(cr)
    # rebuild a progress-shaped object from the sticky met set for the feedback text
    prior = crisis_mod.CrisisProgress(
        crisis_id=cr.id,
        met=state["crisis_met"],
        unmet=[r for r in cr.requirements if r.id not in state["crisis_met"]],
    )
    return crisis_mod.build_event_text(cr, prior_progress=prior)


# --------------------------------------------------------------------------- a round
def resolve_round(world, reactions):
    """Advance the campaign by one player round given the residents' reactions."""
    wid = world["id"]
    state = world_state.get_campaign(wid)
    cr = current_crisis(world)
    if not cr or state["status"] not in ("playing",):
        return {"outcome": "idle", **view(world)}

    round_no = state["crisis_round"] + 1
    prog = crisis_mod.evaluate(cr, reactions, world, prior_met=state["crisis_met"])
    world_state.campaign_update(wid, crisis_met=prog.met, crisis_round=round_no)

    if prog.mvp:
        tally = state["mvp_tally"]
        tally[prog.mvp] = tally.get(prog.mvp, 0) + 1
        world_state.campaign_update(wid, mvp_tally=tally)

    if prog.resolved:
        grade = _grade(round_no, world_state.get_chaos(wid), won=True)
        dispatch = crisis_mod.narrate(cr, prog, round_no=round_no)
        return _finish_chapter(world, cr, grade, prog, dispatch, won=True)

    # not resolved — chaos ramps with each round so the time limit is the real
    # budget (campaign owns the chaos gauge; we overwrite any per-event drift).
    pressure = min(1.0, (round_no / cr.time_limit) * (0.8 + 0.05 * cr.severity))
    world_state.reset_chaos(wid)
    world_state.add_chaos(wid, pressure)
    if round_no >= cr.time_limit:
        grade = "F"
        dispatch = crisis_mod.narrate(cr, prog, round_no=round_no, failed=True)
        return _finish_chapter(world, cr, grade, prog, dispatch, won=False)

    dispatch = crisis_mod.narrate(cr, prog, round_no=round_no)
    world_state.campaign_update(wid, last_dispatch=dispatch)
    return {"outcome": "ongoing", "dispatch": dispatch, "progress": prog, "grade": None, **view(world)}


def _finish_chapter(world, cr, grade, prog, dispatch, won):
    wid = world["id"]
    state = world_state.get_campaign(wid)
    camp = get_campaign_def(world)
    chapter = current_chapter(world)

    resilience = max(0, state["town_resilience"] - GRADE_COST.get(grade, 12))
    grades = state["chapter_grades"] + [{
        "chapter": chapter.id if chapter else cr.id,
        "title": cr.title,
        "grade": grade,
        "rounds": state["crisis_round"],
        "mvp": prog.mvp,
        "won": won,
    }]
    clues = state["clues"] + ([chapter.clue] if chapter and chapter.clue else [])

    world_state.campaign_update(
        wid,
        town_resilience=resilience,
        chapter_grades=grades,
        clues=clues,
        last_dispatch=dispatch,
    )

    next_index = state["chapter_index"] + 1
    outcome = "won" if won else "lost_crisis"
    outro = (chapter.outro_win if won else chapter.outro_loss) if chapter else ""

    if resilience <= 0:
        world_state.campaign_update(wid, status="lost", crisis_id=None)
        return {"outcome": "campaign_lost", "dispatch": dispatch, "outro": outro,
                "grade": grade, "progress": prog, **view(world)}

    if next_index >= len(camp.chapters):
        # campaign cleared — the meta-mystery resolves
        world_state.campaign_update(wid, status="finale", chapter_index=next_index, crisis_id=None)
        return {"outcome": "finale", "dispatch": dispatch, "outro": outro, "grade": grade,
                "reveal": camp.finale_reveal, "progress": prog, **view(world)}

    world_state.campaign_update(wid, chapter_index=next_index)
    _inject(world, camp.chapters[next_index])
    return {"outcome": outcome, "dispatch": dispatch, "outro": outro, "grade": grade,
            "progress": prog, **view(world)}


def _grade(round_no, chaos, won):
    if not won:
        return "F"
    if round_no == 1:
        base = "A"
    elif round_no == 2:
        base = "B"
    elif round_no == 3:
        base = "C"
    else:
        base = "D"
    # a messy scene (high chaos) knocks the grade down one notch
    if chaos >= 0.6 and base in ("A", "B", "C"):
        base = {"A": "B", "B": "C", "C": "D"}[base]
    return base


# --------------------------------------------------------------------------- snapshot
def view(world):
    """A serializable snapshot of campaign + active crisis for the UI/HUD."""
    wid = world["id"]
    camp = get_campaign_def(world)
    state = world_state.get_campaign(wid)
    cr = current_crisis(world)
    chapter = current_chapter(world)

    crisis_view = None
    if cr:
        crisis_view = {
            "id": cr.id,
            "title": cr.title,
            "kind": cr.kind,
            "affected_hotspot": cr.affected_hotspot,
            "severity": cr.severity,
            "time_limit": cr.time_limit,
            "round": state["crisis_round"],
            "focus": cr.focus,
            "requirements": [
                {"id": r.id, "label": r.label, "met": r.id in state["crisis_met"],
                 "optional": r.optional}
                for r in cr.requirements
            ],
        }

    return {
        "active": state["active"],
        "status": state["status"],
        "title": camp.title if camp else "",
        "chapter_index": state["chapter_index"],
        "chapter_count": len(camp.chapters) if camp else 0,
        "chapter_intro": chapter.intro if chapter else "",
        "town_resilience": state["town_resilience"],
        "chaos": round(world_state.get_chaos(wid), 3),
        "clues": state["clues"],
        "chapter_grades": state["chapter_grades"],
        "mvp_tally": state["mvp_tally"],
        "last_dispatch": state["last_dispatch"],
        "crisis": crisis_view,
    }