import json
from typing import Any

from app.db.models import PomodoroSession
from app.pomodoro.cycle import PHASE_LONG_BREAK, PHASE_SHORT_BREAK, PHASE_WORK

PHASE_LABELS = {
    PHASE_WORK: "Работа",
    PHASE_SHORT_BREAK: "Короткий перерыв",
    PHASE_LONG_BREAK: "Длинный перерыв",
}


def _format_time(seconds: int) -> str:
    minutes, secs = divmod(max(0, seconds), 60)
    return f"{minutes:02d}:{secs:02d}"


def format_phase_completed_notice(
    session: PomodoroSession,
    next_phase: str | None,
) -> str:
    phase_label = PHASE_LABELS.get(session.phase, session.phase)
    task = session.task_note or "без описания"
    lines = [f"⏱ **{phase_label} завершена** · {session.duration_min} мин · _{task}_"]

    if next_phase == PHASE_SHORT_BREAK:
        lines.append("Дальше: короткий перерыв ☕")
    elif next_phase == PHASE_LONG_BREAK:
        lines.append("Дальше: длинный перерыв 🌴 · цикл почти завершён")
    elif next_phase == PHASE_WORK:
        lines.append("Дальше: снова работа 💪")
    else:
        lines.append("Цикл сброшен. Можно отдохнуть и начать заново.")

    return "\n".join(lines)


POMODORO_TOOL_NAMES = frozenset({
    "get_pomodoro_status",
    "start_pomodoro",
    "start_short_break",
    "start_long_break",
    "stop_pomodoro",
    "skip_pomodoro_phase",
    "reset_pomodoro_cycle",
    "get_pomodoro_history",
})

MEMORY_TOOL_NAMES = frozenset({
    "remember_fact",
    "recall_memories",
    "forget_memory",
    "update_profile",
    "update_session_summary",
})

FITNESS_TOOL_NAMES = frozenset({
    "get_fitness_summary",
    "get_fitness_history",
    "set_fitness_profile",
    "calc_fitness_targets",
    "calc_body_composition",
    "log_meal",
    "log_water",
    "log_weight",
    "log_workout",
    "lookup_food",
    "lookup_exercise",
    "set_fitness_reminder",
})

# Не засорять чат служебными ответами
REMINDER_TOOL_NAMES = frozenset({
    "list_reminders",
    "create_reminder",
    "update_reminder",
    "delete_reminder",
    "complete_reminder",
})

SHOPPING_TOOL_NAMES = frozenset({
    "list_shopping_lists",
    "create_shopping_list",
    "add_shopping_items",
    "check_shopping_item",
    "remove_shopping_item",
    "delete_shopping_list",
})

TOOLS_SKIP_CHAT_NOTICE = frozenset({
    "get_pomodoro_status",
    "recall_memories",
    "get_fitness_summary",
    "get_fitness_history",
    "lookup_food",
    "lookup_exercise",
    "calc_fitness_targets",
    "calc_body_composition",
    "get_weather",
    "get_morning_briefing",
    "list_shopping_lists",
    "list_reminders",
})



def _format_body_composition_notice(computed: dict[str, Any], *, headline: str) -> str:
    parts: list[str] = []
    bf = computed.get("body_fat_pct")
    if bf is not None:
        method = computed.get("body_fat_method")
        if method == "navy":
            parts.append(f"жир ≈{bf}% (Navy)")
        elif method == "manual":
            parts.append(f"жир {bf}%")
        else:
            parts.append(f"жир ≈{bf}%")
    if computed.get("whr") is not None:
        parts.append(f"WHR {computed.get('whr')}")
    if computed.get("ffmi") is not None:
        parts.append(f"FFMI {computed.get('ffmi')}")
    if parts:
        return f"{headline} — {', '.join(parts)}"
    return headline

def format_tool_notice(tool_name: str, raw_result: str) -> str | None:
    if tool_name in TOOLS_SKIP_CHAT_NOTICE:
        return None

    try:
        data = json.loads(raw_result)
    except json.JSONDecodeError:
        return None

    if isinstance(data, dict) and "error" in data:
        if tool_name in POMODORO_TOOL_NAMES:
            prefix = "⏱"
        elif tool_name in MEMORY_TOOL_NAMES:
            prefix = "🧠"
        elif tool_name in FITNESS_TOOL_NAMES:
            prefix = "💪"
        elif tool_name in SHOPPING_TOOL_NAMES:
            prefix = "🛒"
        elif tool_name in REMINDER_TOOL_NAMES:
            prefix = "📅"
        else:
            prefix = "📋"
        return f"{prefix} {data['error']}"

    if tool_name == "reset_pomodoro_cycle":
        cycle = data.get("cycle", data)
        return (
            "⏱ **Цикл помидоро сброшен** · "
            f"прогресс: {cycle.get('completed_work_sessions', 0)}/"
            f"{cycle.get('sessions_until_long_break', 4)}"
        )

    if tool_name in (
        "get_pomodoro_status",
        "start_pomodoro",
        "start_work",
        "start_short_break",
        "start_long_break",
        "stop_pomodoro",
        "skip_pomodoro_phase",
    ):
        return _format_status_notice(data)

    if tool_name == "get_pomodoro_history":
        return _format_history_notice(data)

    if tool_name == "create_work_item":
        return _format_work_item_notice(data)

    if tool_name == "list_work_items":
        return _format_work_items_list_notice(data)

    if tool_name == "list_taiga_tasks":
        return _format_taiga_tasks_notice(data)

    if tool_name == "sync_taiga_projects":
        return f"📋 Синхронизировано проектов Taiga: **{len(data)}**"

    if tool_name == "list_taiga_projects":
        if not isinstance(data, list) or not data:
            return "📋 Проекты Taiga не найдены. Вызовите sync_taiga_projects."
        lines = ["📋 **Проекты:**"]
        for p in data:
            gitea = f"{p.get('gitea_owner')}/{p.get('gitea_repo')}" if p.get("gitea_configured") else "—"
            lines.append(f"- `{p.get('slug')}`: {p.get('name')} · Gitea: {gitea}")
        return "\n".join(lines)

    if tool_name == "remember_fact" and data.get("ok"):
        action = "обновлено" if data.get("action") == "updated" else "сохранено"
        return f"🧠 **Память {action}** · #{data.get('memory_id')}: {data.get('content')}"

    if tool_name == "forget_memory" and data.get("ok"):
        return f"🧠 **Забыто** · #{data.get('memory_id')}: {data.get('forgotten')}"

    if tool_name == "update_profile" and data.get("ok"):
        profile = data.get("profile") or {}
        parts = [f"{k}={v}" for k, v in profile.items() if v]
        return f"🧠 **Профиль обновлён** · {', '.join(parts) or 'пусто'}"

    if tool_name == "update_session_summary" and data.get("ok"):
        return "🧠 **Сводка чата сохранена**"

    if tool_name == "log_meal" and data.get("ok"):
        meal = data.get("meal", {})
        est = "≈" if meal.get("estimated") else ""
        return (
            f"💪 **Приём пищи** · {meal.get('description')} · "
            f"{est}{meal.get('calories', 0):.0f} ккал "
            f"(Б{meal.get('protein_g', 0):.0f}/Ж{meal.get('fat_g', 0):.0f}/У{meal.get('carbs_g', 0):.0f})"
        )

    if tool_name == "log_water" and data.get("ok"):
        w = data.get("water", {})
        return f"💪 **Вода** +{w.get('amount_ml')} мл"

    if tool_name == "log_weight" and data.get("ok"):
        m = data.get("metric", {})
        computed = data.get("computed") or {}
        headline = f"💪 **Вес** {m.get('weight_kg')} кг"
        return _format_body_composition_notice(computed, headline=headline)

    if tool_name == "calc_body_composition" and isinstance(data, dict) and "error" not in data:
        w = data.get("weight_kg")
        headline = "💪 **Состав тела** (расчёт)"
        if w is not None:
            headline += f" · {w} кг"
        msg = _format_body_composition_notice(data, headline=headline)
        warnings = data.get("warnings") or []
        if warnings:
            msg += f" · {'; '.join(warnings[:2])}"
        return msg

    if tool_name == "log_workout" and data.get("ok"):
        wo = data.get("workout", {})
        return f"💪 **Тренировка** · {wo.get('title')}"

    if tool_name == "set_fitness_profile" and data.get("ok"):
        p = data.get("profile", {})
        return (
            f"💪 **Профиль** · {p.get('calorie_target')} ккал, "
            f"вода {p.get('water_l')} л"
        )

    if tool_name == "set_fitness_reminder" and data.get("ok"):
        r = data.get("reminder", {})
        state = "вкл" if r.get("enabled") else "выкл"
        return f"💪 **Напоминание {r.get('kind')}** · {state}"

    if tool_name == "generate_image" and data.get("ok"):
        url = data.get("url", "")
        return f"🎨 **Картинка готова**\n\n![image]({url})"

    if tool_name == "create_shopping_list" and data.get("ok"):
        lst = data.get("list") or {}
        action = "создан" if data.get("created") else "уже был"
        return f"🛒 **Список {action}** · «{lst.get('name')}» (#{lst.get('id')})"

    if tool_name == "add_shopping_items" and data.get("ok"):
        added = data.get("added") or []
        names = ", ".join(i.get("text", "") for i in added[:5])
        extra = f" +{len(added) - 5}" if len(added) > 5 else ""
        return f"🛒 **Добавлено в «{data.get('list_name')}»** · {names}{extra}"

    if tool_name == "check_shopping_item" and data.get("ok"):
        item = data.get("item") or {}
        state = "куплено" if item.get("checked") else "снята отметка"
        return f"🛒 **{state}** · #{item.get('id')} {item.get('text')}"

    if tool_name == "remove_shopping_item" and data.get("ok"):
        removed = data.get("removed") or {}
        return f"🛒 **Удалено** · {removed.get('text')}"

    if tool_name == "delete_shopping_list" and data.get("ok"):
        return f"🛒 **Список удалён** · «{data.get('name')}»"

    if tool_name == "create_reminder" and data.get("ok"):
        r = data.get("reminder") or {}
        rec = r.get("recurrence", "none")
        rec_label = f" · повтор {rec}" if rec and rec != "none" else ""
        return f"📅 **Напоминание создано** · {r.get('title')} · {r.get('due_at_local')}{rec_label}"

    if tool_name == "update_reminder" and data.get("ok"):
        r = data.get("reminder") or {}
        return f"📅 **Напоминание обновлено** · #{r.get('id')} {r.get('title')}"

    if tool_name == "delete_reminder" and data.get("ok"):
        return f"📅 **Напоминание удалено** · «{data.get('title')}»"

    if tool_name == "complete_reminder" and data.get("ok"):
        r = data.get("reminder") or {}
        return f"📅 **Готово** · {r.get('title')}"

    return None


def _format_work_item_notice(data: dict[str, Any]) -> str | None:
    if data.get("error"):
        return f"📋 {data['error']}"
    if not data.get("ok"):
        return None
    taiga = data.get("taiga", {})
    gitea = data.get("gitea", {})
    lines = [
        "📋 **Создано:**",
        f"- Taiga: #{taiga.get('ref')} — {taiga.get('subject')}",
        f"- URL: {taiga.get('url')}",
    ]
    if gitea.get("url"):
        lines.append(f"- Gitea: {gitea.get('url')}")
    if data.get("branch"):
        lines.append(f"- Ветка: `{data['branch']}`")
    subtasks = data.get("subtasks") or []
    if subtasks:
        lines.append("**Подзадачи:**")
        for t in subtasks:
            lines.append(f"- #{t.get('ref')} {t.get('subject')}")
    return "\n".join(lines)


def _format_work_items_list_notice(data: Any) -> str | None:
    if not isinstance(data, list) or not data:
        return "📋 Локальных work items (созданных ассистентом) нет."
    lines = ["📋 **Work items ассистента:**"]
    for item in data[:15]:
        lines.append(
            f"- [{item.get('status')}] #{item.get('taiga_ref')} {item.get('title')} "
            f"({item.get('taiga_slug')})"
        )
    return "\n".join(lines)


def _format_taiga_tasks_notice(data: Any) -> str | None:
    if not isinstance(data, dict):
        return None
    if data.get("error"):
        return f"📋 {data['error']}"

    blocks = data.get("projects") or []
    total_stories = data.get("total_stories", 0)
    total_tasks = data.get("total_tasks", 0)

    if not blocks or (total_stories == 0 and total_tasks == 0):
        slug = blocks[0].get("slug") if len(blocks) == 1 else None
        if slug:
            return f"📋 В `{slug}` нет открытых user stories и tasks в Taiga."
        return "📋 Открытых задач в Taiga не найдено."

    lines = [f"📋 **Открытые задачи Taiga** (stories: {total_stories}, tasks: {total_tasks}):"]
    for block in blocks:
        stories = block.get("stories") or []
        tasks = block.get("tasks") or []
        if not stories and not tasks:
            continue
        lines.append(f"**{block.get('name')}** (`{block.get('slug')}`):")
        for s in stories:
            lines.append(f"- story #{s.get('ref')} {s.get('subject')}")
        for t in tasks:
            lines.append(f"- task #{t.get('ref')} {t.get('subject')}")
    return "\n".join(lines)


def _format_status_notice(data: dict[str, Any]) -> str:
    status = data.get("status", "idle")
    phase = data.get("phase", PHASE_WORK)
    phase_label = PHASE_LABELS.get(phase, phase)
    task = data.get("task_note") or "без описания"
    remaining = data.get("remaining_seconds", 0)
    duration = data.get("duration_min", 25)
    cycle = data.get("cycle", {})
    cycle_info = ""
    if cycle:
        cycle_info = (
            f" · цикл {cycle.get('completed_work_sessions', 0)}/"
            f"{cycle.get('sessions_until_long_break', 4)}"
        )

    if status == "idle":
        return f"⏱ **Помидоро:** таймер не запущен{cycle_info}."

    if status == "running":
        return (
            f"⏱ **{phase_label}** · осталось **{_format_time(remaining)}** "
            f"из {duration} мин · _{task}_{cycle_info}"
        )

    if status == "paused":
        elapsed = data.get("elapsed_seconds", 0)
        return (
            f"⏱ **{phase_label} на паузе** · прошло {_format_time(elapsed)} "
            f"из {duration} мин · _{task}_{cycle_info}"
        )

    if status == "completed":
        return f"⏱ **{phase_label} завершена** · {duration} мин · _{task}_"

    if status == "cancelled":
        return f"⏱ **{phase_label} отменена** · _{task}_"

    return f"⏱ Помидоро: {status}"


def _format_history_notice(data: Any) -> str:
    if not isinstance(data, list) or not data:
        return "⏱ **История помидоро** пуста."

    lines = ["⏱ **История помидоро:**"]
    for item in data[:10]:
        task = item.get("task_note") or "без описания"
        phase = PHASE_LABELS.get(item.get("phase", ""), item.get("phase", "?"))
        duration = item.get("duration_min", "?")
        lines.append(f"- {phase}: {task} ({duration} мин)")

    return "\n".join(lines)


def format_pomodoro_context(status: dict[str, Any]) -> str:
    notice = _format_status_notice(status)
    cycle = status.get("cycle", {})
    extra = ""
    if cycle:
        extra = (
            f"\nНастройки цикла: работа {cycle.get('work_duration_min')} мин, "
            f"перерыв {cycle.get('short_break_min')} мин, "
            f"длинный {cycle.get('long_break_min')} мин."
        )
    return f"[Актуальный статус помидоро]\n{notice}{extra}"