//! 战斗写入命令。
//!
//! 用于表达创建战斗、使用技能、逃离和结算等输入，不直接携带表行类型。

use crate::domain::{BattleMode, LEGACY_ATTACK_FUNCTION_IDS};
use crate::errors::CombatFieldError;
use module_runtime_item::{
    RuntimeItemRewardItemSnapshot, TreasureFieldError, normalize_reward_item_snapshot,
};
use serde::{Deserialize, Serialize};
use shared_kernel::normalize_required_string;
#[cfg(feature = "spacetime-types")]
use spacetimedb::SpacetimeType;

#[cfg_attr(feature = "spacetime-types", derive(SpacetimeType))]
#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
pub struct BattleStateInput {
    pub battle_state_id: String,
    pub story_session_id: String,
    pub runtime_session_id: String,
    pub actor_user_id: String,
    pub chapter_id: Option<String>,
    pub target_npc_id: String,
    pub target_name: String,
    pub battle_mode: BattleMode,
    pub player_hp: i32,
    pub player_max_hp: i32,
    pub player_mana: i32,
    pub player_max_mana: i32,
    pub target_hp: i32,
    pub target_max_hp: i32,
    pub experience_reward: u32,
    pub reward_items: Vec<RuntimeItemRewardItemSnapshot>,
    pub created_at_micros: i64,
}

#[cfg_attr(feature = "spacetime-types", derive(SpacetimeType))]
#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
pub struct ResolveCombatActionInput {
    pub battle_state_id: String,
    pub function_id: String,
    pub action_text: String,
    pub base_damage: i32,
    pub mana_cost: i32,
    pub heal: i32,
    pub mana_restore: i32,
    pub counter_multiplier_basis_points: u32,
    pub updated_at_micros: i64,
}

#[cfg_attr(feature = "spacetime-types", derive(SpacetimeType))]
#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
pub struct BattleStateQueryInput {
    pub battle_state_id: String,
}

pub fn validate_battle_state_input(input: &BattleStateInput) -> Result<(), CombatFieldError> {
    if normalize_required_string(&input.battle_state_id).is_none() {
        return Err(CombatFieldError::MissingBattleStateId);
    }
    if normalize_required_string(&input.story_session_id).is_none() {
        return Err(CombatFieldError::MissingStorySessionId);
    }
    if normalize_required_string(&input.runtime_session_id).is_none() {
        return Err(CombatFieldError::MissingRuntimeSessionId);
    }
    if normalize_required_string(&input.actor_user_id).is_none() {
        return Err(CombatFieldError::MissingActorUserId);
    }
    if normalize_required_string(&input.target_npc_id).is_none() {
        return Err(CombatFieldError::MissingTargetNpcId);
    }
    if normalize_required_string(&input.target_name).is_none() {
        return Err(CombatFieldError::MissingTargetName);
    }
    if input.player_max_hp <= 0 || input.player_hp <= 0 || input.player_hp > input.player_max_hp {
        return Err(CombatFieldError::InvalidPlayerVitals);
    }
    if input.player_max_mana < 0
        || input.player_mana < 0
        || input.player_mana > input.player_max_mana
    {
        return Err(CombatFieldError::InvalidPlayerVitals);
    }
    if input.target_max_hp <= 0 || input.target_hp <= 0 || input.target_hp > input.target_max_hp {
        return Err(CombatFieldError::InvalidTargetVitals);
    }
    for reward_item in input.reward_items.iter().cloned() {
        normalize_reward_item_snapshot(reward_item).map_err(map_reward_item_field_error)?;
    }

    Ok(())
}

pub fn validate_resolve_combat_action_input(
    input: &ResolveCombatActionInput,
) -> Result<(), CombatFieldError> {
    if normalize_required_string(&input.battle_state_id).is_none() {
        return Err(CombatFieldError::MissingBattleStateId);
    }
    if normalize_required_string(&input.function_id).is_none() {
        return Err(CombatFieldError::MissingFunctionId);
    }
    if !is_supported_combat_function_id(&input.function_id) {
        return Err(CombatFieldError::UnsupportedFunctionId);
    }

    Ok(())
}

pub fn build_battle_state_query_input(
    battle_state_id: String,
) -> Result<BattleStateQueryInput, CombatFieldError> {
    let input = BattleStateQueryInput {
        battle_state_id: normalize_required_string(battle_state_id).unwrap_or_default(),
    };

    validate_battle_state_query_input(&input)?;

    Ok(input)
}

pub fn validate_battle_state_query_input(
    input: &BattleStateQueryInput,
) -> Result<(), CombatFieldError> {
    if normalize_required_string(&input.battle_state_id).is_none() {
        return Err(CombatFieldError::MissingBattleStateId);
    }

    Ok(())
}

pub fn is_supported_combat_function_id(function_id: &str) -> bool {
    matches!(
        function_id,
        "battle_attack_basic"
            | "battle_recover_breath"
            | "battle_use_skill"
            | "battle_escape_breakout"
    ) || LEGACY_ATTACK_FUNCTION_IDS.contains(&function_id)
}

fn map_reward_item_field_error(error: TreasureFieldError) -> CombatFieldError {
    let message = match error {
        TreasureFieldError::MissingRewardItemId => {
            "battle_state.reward_items[].item_id 不能为空".to_string()
        }
        TreasureFieldError::MissingRewardItemCategory => {
            "battle_state.reward_items[].category 不能为空".to_string()
        }
        TreasureFieldError::MissingRewardItemName => {
            "battle_state.reward_items[].item_name 不能为空".to_string()
        }
        TreasureFieldError::InvalidRewardItemQuantity => {
            "battle_state.reward_items[].quantity 必须大于 0".to_string()
        }
        TreasureFieldError::MissingRewardItemStackKey => {
            "battle_state.reward_items[].stack_key 不能为空".to_string()
        }
        TreasureFieldError::RewardEquipmentItemCannotStack => {
            "battle_state.reward_items[] 可装备物品不能标记为 stackable".to_string()
        }
        TreasureFieldError::RewardNonStackableItemMustStaySingleQuantity => {
            "battle_state.reward_items[] 不可堆叠物品必须固定为单槽位单数量".to_string()
        }
        other => other.to_string(),
    };

    CombatFieldError::InvalidRewardItem(message)
}