"""Explorer Tab — location exploration, NPC encounters, quest tracking, actions."""

import random
import gradio as gr

from core.world import WorldGraph
from core.player import load_player, save_player
from core.model_manager import ModelManager
from ui.i18n import t


def _get_location_choices() -> list:
    """Get list of location names for the dropdown."""
    world = WorldGraph()
    return [loc.name for loc in world.get_entities_by_type("location")]


def _render_location(location_name: str) -> str:
    if not location_name:
        return f"""
        <div style="text-align:center;padding:60px 20px;color:#555;">
            <div style="margin-bottom:16px;"></div>
            <p>{t('exp_empty')}</p>
        </div>
        """

    world = WorldGraph()
    player = load_player()

    locations = world.get_entities_by_type("location")
    location = next((l for l in locations if l.name == location_name), None)
    if not location:
        return f"<p>{t('exp_not_found')}</p>"

    player.current_location_id = location.id
    save_player(player)

    all_npcs = world.get_entities_by_type("npc")
    npcs_here = [n for n in all_npcs if n.location_id == location.id]

    all_quests = world.get_entities_by_type("quest")
    quests_here = [q for q in all_quests if q.location_id == location.id and not player.is_quest_completed(q.id)]

    neighbors = world.get_neighbors(location.id, "connects_to")
    connected = [n.name for n in neighbors if n.name != location_name]

    html = f"""
    <div style="max-width:650px;margin:0 auto;">
        <div style="text-align:center;margin-bottom:20px;padding:20px;background:linear-gradient(180deg,rgba(74,158,255,0.08),transparent);border-radius:12px;">
            <div style="font-family:Georgia,serif;font-size:1.6rem;color:#4a9eff;margin-bottom:6px;">
                {location.name}
            </div>
            <div style="color:#aaa;font-size:0.9rem;line-height:1.7;max-width:500px;margin:0 auto;">
                {location.description}
            </div>
        </div>
    """

    if npcs_here:
        html += f'<div style="font-family:Georgia,serif;color:#50c878;font-size:1rem;margin:16px 0 10px;">{t("exp_encounter")}</div>'
        for npc in npcs_here:
            dialog = npc.dialog or "..."
            html += f"""
            <div style="background:#16162a;border:1px solid #2a2a4a;border-radius:10px;padding:14px 18px;margin-bottom:10px;border-left:3px solid #50c878;">
                <div style="color:#50c878;font-weight:600;margin-bottom:4px;">{npc.name}</div>
                <div style="color:#a0d0a0;font-style:italic;font-size:0.9rem;">"{dialog}"</div>
            </div>
            """

    if quests_here:
        html += f'<div style="font-family:Georgia,serif;color:#ffd700;font-size:1rem;margin:16px 0 10px;">{t("exp_quests")}</div>'
        for q in quests_here:
            html += f"""
            <div style="background:#1a1a10;border:1px solid #3a3a2a;border-radius:10px;padding:14px 18px;margin-bottom:10px;border-left:3px solid #ffd700;">
                <div style="color:#ffd700;font-weight:600;margin-bottom:4px;">{q.name}</div>
                <div style="color:#aaa;font-size:0.85rem;line-height:1.5;">{q.description[:100]}...</div>
            </div>
            """

    if connected:
        html += f'<div style="font-family:Georgia,serif;color:#b8a9ff;font-size:1rem;margin:16px 0 10px;">{t("exp_travel")}</div>'
        html += '<div style="display:flex;flex-wrap:wrap;gap:8px;">'
        for loc_name in connected:
            html += f"""
            <div style="padding:6px 14px;background:#16162a;border:1px solid #2a2a4a;border-radius:8px;color:#4a9eff;font-size:0.85rem;">
                {loc_name}
            </div>
            """
        html += "</div>"

    html += "</div>"
    return html


def explore_location(location_name: str) -> tuple:
    if not location_name:
        return t("exp_select_first"), ""

    world = WorldGraph()
    player = load_player()
    manager = ModelManager()

    locations = world.get_entities_by_type("location")
    location = next((l for l in locations if l.name == location_name), None)
    if not location:
        return t("exp_not_exist"), ""

    outcomes = [t("exp_outcome_1"), t("exp_outcome_2"), t("exp_outcome_3"), t("exp_outcome_4"), t("exp_outcome_5")]
    outcome = outcomes[0]  # Default, LLM overrides

    prompt = f"你在{location.name}探索。{location.description[:100]}\n\n请描述一个有趣的发现（物品或线索），50字以内。用中文回答。"
    gen = manager.generate_fn
    discovery = gen(prompt) or outcome

    level_msg = player.add_xp(15)

    item_found = None
    if random.random() > 0.5:
        item_names = [t("item_key"), t("item_crystal"), t("item_scroll"), t("item_potion"), t("item_dust"), t("item_shard")]
        item_name = random.choice(item_names)
        player.add_item(item_name, discovery[:30], "misc")
        item_found = item_name

    save_player(player)

    result = f"{t('exp_discovery')}: {discovery}"
    if item_found:
        result += f"\n{t('exp_item_found')}: {item_found} (+15 XP)"
    if level_msg:
        result += f"\n{level_msg}"

    return result, _render_location(location_name)


def rest_action(location_name: str) -> tuple:
    player = load_player()
    player.heal(hp=30, mp=20)
    save_player(player)
    return f"{t('exp_rest_result')} (HP:{player.hp}/{player.max_hp}, MP:{player.mp}/{player.max_mp})", _render_location(location_name)


def create_explorer_tab() -> tuple:
    """Create the Explorer tab."""
    with gr.Row():
        location_dropdown = gr.Dropdown(
            label=t("exp_select_label"),
            choices=_get_location_choices(),
            interactive=True,
        )

    location_display = gr.HTML(
        value=f"""
        <div style="text-align:center;padding:60px 20px;color:#555;">
            <div style="margin-bottom:16px;"></div>
            <p>{t('exp_empty')}</p>
        </div>
        """
    )

    with gr.Row():
        explore_btn = gr.Button(t("exp_explore"), variant="primary")
        rest_btn = gr.Button(t("exp_rest"), variant="secondary")

    action_result = gr.HTML("")

    # Location change -> render
    location_dropdown.change(
        fn=_render_location,
        inputs=[location_dropdown],
        outputs=[location_display],
    )

    # Explore
    explore_btn.click(
        fn=explore_location,
        inputs=[location_dropdown],
        outputs=[action_result, location_display],
    )

    # Rest
    rest_btn.click(
        fn=rest_action,
        inputs=[location_dropdown],
        outputs=[action_result, location_display],
    )

    return location_dropdown, location_display, action_result