#!/usr/bin/env python3
"""
Buddymon PostToolUse hook.

Reads tool event JSON from stdin, checks for:
  - Bug monster triggers (error patterns in Bash output)
  - New language encounters (new file extensions in Write/Edit)
  - Commit streaks (git commit via Bash)
  - Deep focus / refactor signals

Outputs additionalContext JSON to stdout if an encounter or event fires.
Always exits 0.
"""

import json
import os
import re
import sys
import random
from pathlib import Path
from datetime import datetime

PLUGIN_ROOT = os.environ.get("CLAUDE_PLUGIN_ROOT", str(Path(__file__).parent.parent))
BUDDYMON_DIR = Path.home() / ".claude" / "buddymon"
CATALOG_FILE = Path(PLUGIN_ROOT) / "lib" / "catalog.json"

KNOWN_EXTENSIONS = {
    ".py": "Python", ".js": "JavaScript", ".ts": "TypeScript",
    ".jsx": "JavaScript/React", ".tsx": "TypeScript/React",
    ".rb": "Ruby", ".go": "Go", ".rs": "Rust", ".c": "C",
    ".cpp": "C++", ".java": "Java", ".cs": "C#", ".swift": "Swift",
    ".kt": "Kotlin", ".php": "PHP", ".lua": "Lua", ".ex": "Elixir",
    ".hs": "Haskell", ".ml": "OCaml", ".clj": "Clojure",
    ".r": "R", ".jl": "Julia", ".sh": "Shell", ".bash": "Shell",
    ".sql": "SQL", ".html": "HTML", ".css": "CSS", ".scss": "SCSS",
    ".vue": "Vue", ".svelte": "Svelte",
}


def load_json(path):
    try:
        with open(path) as f:
            return json.load(f)
    except Exception:
        return {}


def save_json(path, data):
    try:
        with open(path, "w") as f:
            json.dump(data, f, indent=2)
    except Exception:
        pass


def get_state():
    active = load_json(BUDDYMON_DIR / "active.json")
    encounters = load_json(BUDDYMON_DIR / "encounters.json")
    roster = load_json(BUDDYMON_DIR / "roster.json")
    session = load_json(BUDDYMON_DIR / "session.json")
    return active, encounters, roster, session


def add_session_xp(amount: int):
    active_file = BUDDYMON_DIR / "active.json"
    roster_file = BUDDYMON_DIR / "roster.json"

    active = load_json(active_file)
    active["session_xp"] = active.get("session_xp", 0) + amount
    buddy_id = active.get("buddymon_id")
    save_json(active_file, active)

    if buddy_id:
        roster = load_json(roster_file)
        if buddy_id in roster.get("owned", {}):
            roster["owned"][buddy_id]["xp"] = roster["owned"][buddy_id].get("xp", 0) + amount
            save_json(roster_file, roster)


LANGUAGE_TIERS = [
    (0,    "discovering"),
    (50,   "familiar"),
    (150,  "comfortable"),
    (350,  "proficient"),
    (700,  "expert"),
    (1200, "master"),
]


def _tier_for_xp(xp: int) -> tuple[int, str]:
    """Return (level_index, tier_label) for a given XP total."""
    level = 0
    label = LANGUAGE_TIERS[0][1]
    for i, (threshold, name) in enumerate(LANGUAGE_TIERS):
        if xp >= threshold:
            level = i
            label = name
    return level, label


def get_language_affinity(lang: str) -> dict:
    """Return the affinity entry for lang from roster.json, or a fresh one."""
    roster = load_json(BUDDYMON_DIR / "roster.json")
    return roster.get("language_affinities", {}).get(lang, {"xp": 0, "level": 0, "tier": "discovering"})


def add_language_affinity(lang: str, xp_amount: int) -> tuple[bool, str, str]:
    """Add XP to lang's affinity. Returns (leveled_up, old_tier, new_tier)."""
    roster_file = BUDDYMON_DIR / "roster.json"
    roster = load_json(roster_file)
    affinities = roster.setdefault("language_affinities", {})
    entry = affinities.get(lang, {"xp": 0, "level": 0, "tier": "discovering"})

    old_level, old_tier = _tier_for_xp(entry["xp"])
    entry["xp"] = entry.get("xp", 0) + xp_amount
    new_level, new_tier = _tier_for_xp(entry["xp"])
    entry["level"] = new_level
    entry["tier"] = new_tier

    affinities[lang] = entry
    roster["language_affinities"] = affinities
    save_json(roster_file, roster)

    leveled_up = new_level > old_level
    return leveled_up, old_tier, new_tier


def get_languages_seen():
    session = load_json(BUDDYMON_DIR / "session.json")
    return set(session.get("languages_seen", []))


def add_language_seen(lang: str):
    session_file = BUDDYMON_DIR / "session.json"
    session = load_json(session_file)
    langs = session.get("languages_seen", [])
    if lang not in langs:
        langs.append(lang)
        session["languages_seen"] = langs
        save_json(session_file, session)


def increment_session_tools():
    session_file = BUDDYMON_DIR / "session.json"
    session = load_json(session_file)
    session["tools_used"] = session.get("tools_used", 0) + 1
    save_json(session_file, session)


def is_starter_chosen():
    roster = load_json(BUDDYMON_DIR / "roster.json")
    return roster.get("starter_chosen", False)


def get_active_buddy_id():
    active = load_json(BUDDYMON_DIR / "active.json")
    return active.get("buddymon_id")


def get_active_encounter():
    encounters = load_json(BUDDYMON_DIR / "encounters.json")
    return encounters.get("active_encounter")


def set_active_encounter(encounter: dict):
    enc_file = BUDDYMON_DIR / "encounters.json"
    data = load_json(enc_file)
    data["active_encounter"] = encounter
    save_json(enc_file, data)


def wound_encounter() -> None:
    """Drop active encounter to minimum strength and flag for re-announcement."""
    enc_file = BUDDYMON_DIR / "encounters.json"
    data = load_json(enc_file)
    enc = data.get("active_encounter")
    if not enc:
        return
    enc["current_strength"] = 5
    enc["wounded"] = True
    enc["announced"] = False   # triggers UserPromptSubmit re-announcement
    data["active_encounter"] = enc
    save_json(enc_file, data)


def match_bug_monster(output_text: str, catalog: dict) -> dict | None:
    """Return the first matching bug monster from the catalog, or None."""
    if not output_text:
        return None

    # Only check first 4000 chars to avoid scanning huge outputs
    sample = output_text[:4000]

    for monster_id, monster in catalog.get("bug_monsters", {}).items():
        for pattern in monster.get("error_patterns", []):
            if re.search(pattern, sample, re.IGNORECASE):
                return monster
    return None


def encounter_still_present(encounter: dict, output_text: str, catalog: dict) -> bool:
    """Return True if the active encounter's error patterns still appear in output."""
    monster_id = encounter.get("id")
    monster = catalog.get("bug_monsters", {}).get(monster_id)
    if not monster or not output_text:
        return False
    sample = output_text[:4000]
    return any(
        re.search(pat, sample, re.IGNORECASE)
        for pat in monster.get("error_patterns", [])
    )


def auto_resolve_encounter(encounter: dict, buddy_id: str | None) -> tuple[int, str]:
    """Defeat encounter automatically, award XP, clear state. Returns (xp, message)."""
    from datetime import datetime, timezone

    enc_file = BUDDYMON_DIR / "encounters.json"
    active_file = BUDDYMON_DIR / "active.json"
    roster_file = BUDDYMON_DIR / "roster.json"

    xp = encounter.get("xp_reward", 50)

    active = load_json(active_file)
    active["session_xp"] = active.get("session_xp", 0) + xp
    save_json(active_file, active)

    if buddy_id:
        roster = load_json(roster_file)
        if buddy_id in roster.get("owned", {}):
            roster["owned"][buddy_id]["xp"] = roster["owned"][buddy_id].get("xp", 0) + xp
            save_json(roster_file, roster)

    data = load_json(enc_file)
    resolved = dict(encounter)
    resolved["outcome"] = "defeated"
    resolved["timestamp"] = datetime.now(timezone.utc).isoformat()
    data.setdefault("history", []).append(resolved)
    data["active_encounter"] = None
    save_json(enc_file, data)

    return xp, resolved["display"]


def compute_strength(monster: dict, elapsed_minutes: float) -> int:
    """Scale monster strength based on how long the error has persisted."""
    base = monster.get("base_strength", 50)
    if elapsed_minutes < 2:
        return max(10, int(base * 0.6))
    elif elapsed_minutes < 15:
        return base
    elif elapsed_minutes < 60:
        return min(100, int(base * 1.4))
    else:
        # Boss tier — persisted over an hour
        return min(100, int(base * 1.8))


def format_encounter_message(monster: dict, strength: int, buddy_display: str) -> str:
    rarity_stars = {"very_common": "★☆☆☆☆", "common": "★★☆☆☆",
                    "uncommon": "★★★☆☆", "rare": "★★★★☆", "legendary": "★★★★★"}
    stars = rarity_stars.get(monster.get("rarity", "common"), "★★☆☆☆")
    defeatable = monster.get("defeatable", True)
    catch_note = "[catchable]" if monster.get("catchable") else ""
    fight_note = "" if defeatable else "⚠️  CANNOT BE DEFEATED — catch only"

    catchable_str = "[catchable · catch only]" if not defeatable else f"[{monster.get('rarity','?')} · {catch_note}]"

    lines = [
        f"\n💀 **{monster['display']} appeared!**  {catchable_str}",
        f"   Strength: {strength}%  ·  Rarity: {stars}",
        f"   *{monster.get('flavor', '')}*",
        "",
    ]
    if fight_note:
        lines.append(f"   {fight_note}")
        lines.append("")
    lines += [
        f"   **{buddy_display}** is ready to battle!",
        "",
        "   `[FIGHT]` Beat the bug → your buddy defeats it → XP reward",
        "   `[CATCH]` Weaken it first (write a test, isolate repro, add comment) → attempt catch",
        "   `[FLEE]`  Ignore → monster grows stronger",
        "",
        "   Use `/buddymon fight` or `/buddymon catch` to weaken + catch it.",
    ]
    return "\n".join(lines)


def match_event_encounter(command: str, output: str, session: dict, catalog: dict):
    """Detect non-error-based encounters: git ops, installs, test results."""
    events = catalog.get("event_encounters", {})
    errors_seen = bool(session.get("errors_encountered") or session.get("tools_used", 0) > 5)

    for enc_id, enc in events.items():
        trigger = enc.get("trigger_type", "")

        if trigger == "command":
            if any(re.search(pat, command) for pat in enc.get("command_patterns", [])):
                return enc

        elif trigger == "output":
            if any(re.search(pat, output, re.IGNORECASE) for pat in enc.get("error_patterns", [])):
                return enc

        elif trigger == "test_victory":
            # Only spawn PhantomPass when tests go green after the session has been running a while
            if errors_seen and any(re.search(pat, output, re.IGNORECASE) for pat in enc.get("success_patterns", [])):
                return enc

    return None


def match_test_file_encounter(file_path: str, catalog: dict):
    """Spawn TestSpecter when editing a test file."""
    enc = catalog.get("event_encounters", {}).get("TestSpecter")
    if not enc:
        return None
    name = os.path.basename(file_path).lower()
    if any(re.search(pat, name) for pat in enc.get("test_file_patterns", [])):
        return enc
    return None


def spawn_encounter(enc: dict) -> None:
    """Write an event encounter to active state with announced=False."""
    strength = enc.get("base_strength", 30)
    encounter = {
        "id": enc["id"],
        "display": enc["display"],
        "base_strength": enc.get("base_strength", 30),
        "current_strength": strength,
        "catchable": enc.get("catchable", True),
        "defeatable": enc.get("defeatable", True),
        "xp_reward": enc.get("xp_reward", 50),
        "weakened_by": [],
        "announced": False,
    }
    set_active_encounter(encounter)


def format_new_language_message(lang: str, buddy_display: str) -> str:
    return (
        f"\n🗺️  **New language spotted: {lang}!**\n"
        f"   {buddy_display} is excited — this is new territory.\n"
        f"   *Explorer XP bonus earned!* +15 XP\n"
    )


def format_language_levelup_message(lang: str, old_tier: str, new_tier: str, total_xp: int, buddy_display: str) -> str:
    tier_emojis = {
        "discovering": "🔭",
        "familiar": "📖",
        "comfortable": "🛠️",
        "proficient": "⚡",
        "expert": "🎯",
        "master": "👑",
    }
    emoji = tier_emojis.get(new_tier, "⬆️")
    return (
        f"\n{emoji} **{lang} affinity: {old_tier} → {new_tier}!**\n"
        f"   {buddy_display} has grown more comfortable in {lang}.\n"
        f"   *Total {lang} XP: {total_xp}*\n"
    )


def format_commit_message(streak: int, buddy_display: str) -> str:
    if streak < 5:
        return ""
    milestone_xp = {5: 50, 10: 120, 25: 300, 50: 700}
    xp = milestone_xp.get(streak, 30)
    return (
        f"\n🔥 **Commit streak: {streak}!**\n"
        f"   {buddy_display} approves. +{xp} XP\n"
    )


def main():
    try:
        data = json.load(sys.stdin)
    except Exception:
        sys.exit(0)

    # Gate: only run if starter chosen
    if not is_starter_chosen():
        sys.exit(0)

    tool_name = data.get("tool_name", "")
    tool_input = data.get("tool_input", {})
    tool_response = data.get("tool_response", {})

    if not BUDDYMON_DIR.exists():
        BUDDYMON_DIR.mkdir(parents=True, exist_ok=True)
        sys.exit(0)

    catalog = load_json(CATALOG_FILE)
    buddy_id = get_active_buddy_id()

    # Look up display name
    buddy_display = "your buddy"
    if buddy_id:
        b = (catalog.get("buddymon", {}).get(buddy_id)
             or catalog.get("evolutions", {}).get(buddy_id))
        if b:
            buddy_display = b.get("display", buddy_id)

    increment_session_tools()

    messages = []

    # ── Bash tool: error detection + auto-resolution + commit tracking ───────
    if tool_name == "Bash":
        command = tool_input.get("command", "")
        output = ""
        # CC Bash tool_response keys: stdout, stderr, interrupted, isImage, noOutputExpected
        if isinstance(tool_response, dict):
            parts = [
                tool_response.get("stdout", ""),
                tool_response.get("stderr", ""),
            ]
            output = "\n".join(p for p in parts if isinstance(p, str) and p)
        elif isinstance(tool_response, str):
            output = tool_response
        elif isinstance(tool_response, list):
            output = "\n".join(
                b.get("text", "") for b in tool_response
                if isinstance(b, dict) and b.get("type") == "text"
            )

        existing = get_active_encounter()

        if existing:
            # On a clean Bash run (monster patterns gone), respect catch_pending,
            # wound a healthy monster, or auto-resolve a wounded one.
            # Probability gates prevent back-to-back Bash runs from instantly
            # resolving encounters before the user can react.
            if output and not encounter_still_present(existing, output, catalog):
                if existing.get("catch_pending"):
                    # User invoked /buddymon catch — hold the monster for them
                    pass
                elif existing.get("wounded"):
                    # Wounded: 35% chance to flee per clean run (avg ~3 runs to escape)
                    if random.random() < 0.35:
                        xp, display = auto_resolve_encounter(existing, buddy_id)
                        messages.append(
                            f"\n💨 **{display} fled!** (escaped while wounded)\n"
                            f"   {buddy_display} gets partial XP: +{xp}\n"
                        )
                else:
                    # Healthy: 50% chance to wound per clean run (avg ~2 runs to wound)
                    if random.random() < 0.50:
                        wound_encounter()
            # else: monster still present, no message — don't spam every tool call
        elif output or command:
            # No active encounter — check for bug monster first, then event encounters
            session = load_json(BUDDYMON_DIR / "session.json")
            monster = match_bug_monster(output, catalog) if output else None
            event = None if monster else match_event_encounter(command, output, session, catalog)
            target = monster or event

            if target and random.random() < 0.70:
                if monster:
                    strength = compute_strength(monster, elapsed_minutes=0)
                else:
                    strength = target.get("base_strength", 30)
                encounter = {
                    "id": target["id"],
                    "display": target["display"],
                    "base_strength": target.get("base_strength", 50),
                    "current_strength": strength,
                    "catchable": target.get("catchable", True),
                    "defeatable": target.get("defeatable", True),
                    "xp_reward": target.get("xp_reward", 50),
                    "weakened_by": [],
                    "announced": False,
                }
                set_active_encounter(encounter)

        # Commit detection
        if "git commit" in command and "exit_code" not in str(tool_response):
            session_file = BUDDYMON_DIR / "session.json"
            session = load_json(session_file)
            session["commits_this_session"] = session.get("commits_this_session", 0) + 1
            save_json(session_file, session)

            commit_xp = 20
            add_session_xp(commit_xp)

    # ── Write / Edit: new language detection + affinity + test file encounters ─
    elif tool_name in ("Write", "Edit", "MultiEdit"):
        file_path = tool_input.get("file_path", "")
        if file_path:
            ext = os.path.splitext(file_path)[1].lower()
            lang = KNOWN_EXTENSIONS.get(ext)
            if lang:
                # Session-level "first encounter" bonus
                seen = get_languages_seen()
                if lang not in seen:
                    add_language_seen(lang)
                    add_session_xp(15)
                    msg = format_new_language_message(lang, buddy_display)
                    messages.append(msg)

                # Persistent affinity XP — always accumulates
                leveled_up, old_tier, new_tier = add_language_affinity(lang, 3)
                if leveled_up:
                    affinity = get_language_affinity(lang)
                    msg = format_language_levelup_message(lang, old_tier, new_tier, affinity["xp"], buddy_display)
                    messages.append(msg)

            # TestSpecter: editing a test file with no active encounter
            if not get_active_encounter():
                enc = match_test_file_encounter(file_path, catalog)
                if enc and random.random() < 0.50:
                    spawn_encounter(enc)

        # Small XP for every file edit
        add_session_xp(2)

    if not messages:
        sys.exit(0)

    combined = "\n".join(messages)
    result = {
        "hookSpecificOutput": {
            "hookEventName": "PostToolUse",
            "additionalContext": combined
        }
    }
    print(json.dumps(result))
    sys.exit(0)


if __name__ == "__main__":
    main()