"""Load a role's system prompt (§16 — prompts are source code) and render the
canon log into a curated digest for the user message (charter §11).

The digest is a projection, not a dump: it surfaces narrative context and
deliberately omits raw integers — companion dispositions render as names only,
luck as its descriptor, and ids/schema_version are dropped (charter §7/§2).
"""

from functools import lru_cache
from pathlib import Path

_PROMPT_DIR = Path(__file__).resolve().parent.parent / "prompts"


def _humanize(id_: str) -> str:
    """Ids are snake_case; the model should read prose. hedge_mage -> hedge-mage."""
    return id_.replace("_", "-")


def _article(word: str) -> str:
    if not word:
        return "a"
    return "an" if word[:1].lower() in "aeiou" else "a"


def _describe_player(player: dict) -> str:
    """'Aldric, a beastfolk cutpurse' — what the AI narrates the player as."""
    race = _humanize(player.get("race_id", ""))
    calling = _humanize(player.get("calling_id", ""))
    name = player.get("name", "")
    parts = [p for p in (race, calling) if p]
    if not parts:
        return name
    descriptor = " ".join(parts)
    return f"{name}, {_article(parts[0])} {descriptor}".strip()


@lru_cache(maxsize=None)
def system_prompt(role: str) -> str:
    text = (_PROMPT_DIR / f"{role}.md").read_text(encoding="utf-8")
    # Everything below the first '---' line is the model-facing prompt; the
    # header above it is human/dev front-matter.
    parts = text.split("\n---\n", 1)
    body = parts[1] if len(parts) == 2 else text
    return body.strip()


def render_digest(canon_log: dict) -> str:
    lines: list[str] = []

    location = canon_log.get("location", {})
    lines.append(f"Location: {location.get('name', 'an unknown place')}")

    events = canon_log.get("recent_events", [])
    if events:
        lines.append("Recent events:")
        lines += [f"- {e}" for e in events]

    facts = canon_log.get("established_facts", [])
    if facts:
        lines.append("Established facts:")
        lines += [f"- {f}" for f in facts]

    party = canon_log.get("party", [])
    if party:
        lines.append("Companions present: " + ", ".join(m.get("name", "") for m in party))

    for quest in canon_log.get("active_quests", []):
        if quest.get("status") == "active":
            lines.append(f"Active quest: {quest.get('name', '')} — {quest.get('objective', '')}")

    player = canon_log.get("player", {})
    descriptor = player.get("luck_descriptor")
    if descriptor:
        lines.append(f"Fortune: {descriptor}")
    lines.append(f"Player: {_describe_player(player)}")

    lines.append("")
    lines.append("Describe the scene as it is now.")
    return "\n".join(lines)


def render_npc_digest(
    canon_log: dict,
    *,
    persona: str,
    knowledge: list[str],
    disposition: int,
    available_moves: list[str],
    utterance: str,
) -> str:
    """User-message digest for the NPC role (§6). Unlike the narrator digest,
    this deliberately carries the disposition integer (§6 permits it; §7 hides
    Luck, not disposition) and the closed move vocabulary the NPC may use."""
    lines: list[str] = []
    lines.append(f"You are: {persona}")
    lines.append(
        f"Your disposition toward the player: {disposition} "
        f"(-100 hostile, 0 neutral, 100 devoted)."
    )

    if knowledge:
        lines.append("")
        lines.append("What you know (this is ALL you know — do not invent beyond it):")
        lines += [f"- {k}" for k in knowledge]

    lines.append("")
    lines.append("Moves you may perform this turn (use ONLY these, as [MOVE: name(args)]):")
    lines += [f"- {m}" for m in available_moves]

    location = canon_log.get("location", {})
    lines.append("")
    lines.append(f"Location: {location.get('name', 'an unknown place')}")

    events = canon_log.get("recent_events", [])
    if events:
        lines.append("Recent events:")
        lines += [f"- {e}" for e in events]

    facts = canon_log.get("established_facts", [])
    if facts:
        lines.append("Established facts:")
        lines += [f"- {f}" for f in facts]

    for quest in canon_log.get("active_quests", []):
        if quest.get("status") == "active":
            lines.append(f"Active quest: {quest.get('name', '')} — {quest.get('objective', '')}")

    player = canon_log.get("player", {})
    lines.append(f"The player is {_describe_player(player)}.")

    lines.append("")
    lines.append(f'The player says to you: "{utterance}"')
    return "\n".join(lines)