use crate::streaming::event_parser::{
    common::{EventMetadata, EventType},
    protocols::pumpfun::{
        discriminators, pumpfun_create_v2_token_event_log_decode, pumpfun_migrate_event_log_decode,
        pumpfun_trade_event_log_decode, PumpFunCreateTokenEvent, PumpFunCreateV2TokenEvent,
        PumpFunMigrateEvent, PumpFunTradeEvent,
    },
    DexEvent,
};
use solana_sdk::pubkey::Pubkey;

/// PumpFun程序ID
pub const PUMPFUN_PROGRAM_ID: Pubkey =
    solana_sdk::pubkey!("6EF8rrecthR5Dkzon8Nwu78hRvfCKubJ14M5uBEwF6P");

/// 解析 PumpFun instruction data
///
/// 根据判别器路由到具体的 instruction 解析函数
pub fn parse_pumpfun_instruction_data(
    discriminator: &[u8],
    data: &[u8],
    accounts: &[Pubkey],
    metadata: EventMetadata,
) -> Option<DexEvent> {
    match discriminator {
        discriminators::CREATE_TOKEN_IX => parse_create_token_instruction(data, accounts, metadata),
        discriminators::CREATE_V2_TOKEN_IX => {
            parse_create_v2_token_instruction(data, accounts, metadata)
        }
        discriminators::BUY_IX => parse_buy_instruction(data, accounts, metadata),
        discriminators::BUY_EXACT_SOL_IN_IX => parse_buy_exact_sol_in_instruction(data, accounts, metadata),
        discriminators::SELL_IX => parse_sell_instruction(data, accounts, metadata),
        discriminators::MIGRATE_IX => parse_migrate_instruction(data, accounts, metadata),
        _ => None,
    }
}

/// 解析 PumpFun inner instruction data
///
/// 根据判别器路由到具体的 inner instruction 解析函数
pub fn parse_pumpfun_inner_instruction_data(
    discriminator: &[u8],
    data: &[u8],
    metadata: EventMetadata,
) -> Option<DexEvent> {
    match discriminator {
        discriminators::CREATE_TOKEN_EVENT => parse_create_token_inner_instruction(data, metadata),
        discriminators::TRADE_EVENT => parse_trade_inner_instruction(data, metadata),
        discriminators::COMPLETE_PUMP_AMM_MIGRATION_EVENT => {
            parse_migrate_inner_instruction(data, metadata)
        }
        _ => None,
    }
}

/// 解析 PumpFun 账户数据
///
/// 根据判别器路由到具体的账户解析函数
pub fn parse_pumpfun_account_data(
    discriminator: &[u8],
    account: &crate::streaming::grpc::AccountPretty,
    metadata: crate::streaming::event_parser::common::EventMetadata,
) -> Option<crate::streaming::event_parser::DexEvent> {
    match discriminator {
        discriminators::BONDING_CURVE_ACCOUNT => {
            crate::streaming::event_parser::protocols::pumpfun::types::bonding_curve_parser(
                account, metadata,
            )
        }
        discriminators::GLOBAL_ACCOUNT => {
            crate::streaming::event_parser::protocols::pumpfun::types::global_parser(
                account, metadata,
            )
        }
        _ => None,
    }
}

/// 解析迁移事件
fn parse_migrate_inner_instruction(data: &[u8], mut metadata: EventMetadata) -> Option<DexEvent> {
    metadata.event_type = EventType::PumpFunMigrate;
    if let Some(event) = pumpfun_migrate_event_log_decode(data) {
        Some(DexEvent::PumpFunMigrateEvent(PumpFunMigrateEvent { metadata, ..event }))
    } else {
        None
    }
}

/// 解析创建代币日志事件
fn parse_create_token_inner_instruction(
    data: &[u8],
    mut metadata: EventMetadata,
) -> Option<DexEvent> {
    metadata.event_type = EventType::PumpFunCreateToken;
    if let Some(event) = pumpfun_create_v2_token_event_log_decode(data) {
        Some(DexEvent::PumpFunCreateV2TokenEvent(PumpFunCreateV2TokenEvent { metadata, ..event }))
    } else {
        None
    }
}

/// 解析交易事件 (inner instruction 不设置 event_type，因为不知道是 Buy 还是 Sell)
fn parse_trade_inner_instruction(data: &[u8], metadata: EventMetadata) -> Option<DexEvent> {
    // 注意：inner instruction 的 trade event 不设置 event_type
    // 因为它会被合并到 instruction event 中，而 instruction event 已经设置了正确的 event_type
    if let Some(event) = pumpfun_trade_event_log_decode(data) {
        Some(DexEvent::PumpFunTradeEvent(PumpFunTradeEvent { metadata, ..event }))
    } else {
        None
    }
}

/// 解析创建代币指令事件
/// 账户: 0: mint, 1: mint_authority, 2: bonding_curve, 3: associated_bonding_curve, 4: global,
/// 5: mpl_token_metadata, 6: metadata_account, 7: user, 8: system_program, 9: token_program,
/// 10: associated_token_program, 11: rent, 12: event_authority, 13: program.
/// 共 14 个固定账户，不足时返回 None 避免越界。
fn parse_create_token_instruction(
    data: &[u8],
    accounts: &[Pubkey],
    mut metadata: EventMetadata,
) -> Option<DexEvent> {
    metadata.event_type = EventType::PumpFunCreateToken;

    const CREATE_TOKEN_MIN_ACCOUNTS: usize = 14;
    if data.len() < 16 || accounts.len() < CREATE_TOKEN_MIN_ACCOUNTS {
        return None;
    }
    let mut offset = 0;
    if offset + 4 > data.len() {
        return None;
    }
    let name_len = u32::from_le_bytes(data[offset..offset + 4].try_into().unwrap()) as usize;
    offset += 4;
    if offset + name_len > data.len() {
        return None;
    }
    let name = String::from_utf8_lossy(&data[offset..offset + name_len]);
    offset += name_len;
    if offset + 4 > data.len() {
        return None;
    }
    let symbol_len = u32::from_le_bytes(data[offset..offset + 4].try_into().unwrap()) as usize;
    offset += 4;
    if offset + symbol_len > data.len() {
        return None;
    }
    let symbol = String::from_utf8_lossy(&data[offset..offset + symbol_len]);
    offset += symbol_len;
    if offset + 4 > data.len() {
        return None;
    }
    let uri_len = u32::from_le_bytes(data[offset..offset + 4].try_into().unwrap()) as usize;
    offset += 4;
    if offset + uri_len > data.len() {
        return None;
    }
    let uri = String::from_utf8_lossy(&data[offset..offset + uri_len]);
    offset += uri_len;
    let creator = if offset + 32 <= data.len() {
        Pubkey::new_from_array(data[offset..offset + 32].try_into().ok()?)
    } else {
        Pubkey::default()
    };

    Some(DexEvent::PumpFunCreateTokenEvent(PumpFunCreateTokenEvent {
        metadata,
        name: name.to_string(),
        symbol: symbol.to_string(),
        uri: uri.to_string(),
        creator,
        mint: accounts[0],
        mint_authority: accounts[1],
        bonding_curve: accounts[2],
        associated_bonding_curve: accounts[3],
        global: accounts[4],
        mpl_token_metadata: accounts[5],
        metadata_account: accounts[6],
        user: accounts[7],
        system_program: accounts[8],
        token_program: accounts[9],
        associated_token_program: accounts[10],
        rent: accounts[11],
        event_authority: accounts[12],
        program: accounts[13],
        ..Default::default()
    }))
}

/// 解析创建 V2 代币指令事件 (SPL-22 Token, Mayhem Mode)
/// 账户: 0: mint, 1: mint_authority, 2: bonding_curve, 3: associated_bonding_curve, 4: global,
/// 5: user, 6: system_program, 7: token_program, 8: associated_token_program, 9: mayhem_program_id,
/// 10: global_params, 11: sol_vault, 12: mayhem_state, 13: mayhem_token_vault, 14: event_authority, 15: program.
/// 共 16 个固定账户，不足时返回 None 避免越界。
/// 注意：shredstream 路径仅传入 static_account_keys，若交易使用 Address Lookup Tables，
/// 无法解析 loaded_addresses，部分账户会以 default 填充，导致 token_program/global 等错误。
fn parse_create_v2_token_instruction(
    data: &[u8],
    accounts: &[Pubkey],
    mut metadata: EventMetadata,
) -> Option<DexEvent> {
    metadata.event_type = EventType::PumpFunCreateV2Token;

    const CREATE_V2_MIN_ACCOUNTS: usize = 16;
    if data.len() < 16 || accounts.len() < CREATE_V2_MIN_ACCOUNTS {
        return None;
    }
    let mut offset = 0;
    if offset + 4 > data.len() {
        return None;
    }
    let name_len = u32::from_le_bytes(data[offset..offset + 4].try_into().unwrap()) as usize;
    offset += 4;
    if offset + name_len > data.len() {
        return None;
    }
    let name = String::from_utf8_lossy(&data[offset..offset + name_len]);
    offset += name_len;
    if offset + 4 > data.len() {
        return None;
    }
    let symbol_len = u32::from_le_bytes(data[offset..offset + 4].try_into().unwrap()) as usize;
    offset += 4;
    if offset + symbol_len > data.len() {
        return None;
    }
    let symbol = String::from_utf8_lossy(&data[offset..offset + symbol_len]);
    offset += symbol_len;
    if offset + 4 > data.len() {
        return None;
    }
    let uri_len = u32::from_le_bytes(data[offset..offset + 4].try_into().unwrap()) as usize;
    offset += 4;
    if offset + uri_len > data.len() {
        return None;
    }
    let uri = String::from_utf8_lossy(&data[offset..offset + uri_len]);
    offset += uri_len;
    let creator = if offset + 32 <= data.len() {
        Pubkey::new_from_array(data[offset..offset + 32].try_into().ok()?)
    } else {
        Pubkey::default()
    };

    Some(DexEvent::PumpFunCreateV2TokenEvent(PumpFunCreateV2TokenEvent {
        metadata,
        name: name.to_string(),
        symbol: symbol.to_string(),
        uri: uri.to_string(),
        creator,
        mint: accounts[0],
        mint_authority: accounts[1],
        bonding_curve: accounts[2],
        associated_bonding_curve: accounts[3],
        global: accounts[4],
        user: accounts[5],
        system_program: accounts[6],
        token_program: accounts[7],
        associated_token_program: accounts[8],
        mayhem_program_id: accounts[9],
        global_params: accounts[10],
        sol_vault: accounts[11],
        mayhem_state: accounts[12],
        mayhem_token_vault: accounts[13],
        event_authority: accounts[14],
        program: accounts[15],
        ..Default::default()
    }))
}

/// Parse buy instruction event.
/// Buy has 16 fixed accounts + optional 17th (index 16, "Account" on block explorers):
/// 0: global, 1: fee_recipient, 2: mint, 3: bonding_curve, 4: associated_bonding_curve,
/// 5: associated_user, 6: user, 7: system_program, 8: token_program, 9: creator_vault,
/// 10: event_authority, 11: program, 12: global_volume_accumulator, 13: user_volume_accumulator,
/// 14: fee_config, 15: fee_program, 16 (optional): account.
fn parse_buy_instruction(
    data: &[u8],
    accounts: &[Pubkey],
    mut metadata: EventMetadata,
) -> Option<DexEvent> {
    metadata.event_type = EventType::PumpFunBuy;

    if data.len() < 16 || accounts.len() < 16 {
        return None;
    }
    let amount = u64::from_le_bytes(data[0..8].try_into().unwrap());
    let max_sol_cost = u64::from_le_bytes(data[8..16].try_into().unwrap());
    Some(DexEvent::PumpFunTradeEvent(PumpFunTradeEvent {
        metadata,
        global: accounts[0],
        fee_recipient: accounts[1],
        mint: accounts[2],
        bonding_curve: accounts[3],
        associated_bonding_curve: accounts[4],
        associated_user: accounts[5],
        user: accounts[6],
        system_program: accounts[7],
        token_program: accounts[8],
        creator_vault: accounts[9],
        event_authority: accounts[10],
        program: accounts[11],
        global_volume_accumulator: accounts[12],
        user_volume_accumulator: accounts[13],
        fee_config: accounts[14],
        fee_program: accounts[15],
        account: accounts.get(16).copied(),
        max_sol_cost,
        amount,
        is_buy: true,
        ..Default::default()
    }))
}

/// Parse buy_exact_sol_in instruction event.
/// Same account layout as buy: 16 fixed + optional 17th (index 16).
/// Args: spendable_sol_in (SOL), min_tokens_out (token).
fn parse_buy_exact_sol_in_instruction(
    data: &[u8], accounts: &[Pubkey],
    mut metadata: EventMetadata,
) -> Option<DexEvent> {
    metadata.event_type = EventType::PumpFunBuy;

    if data.len() < 16 || accounts.len() < 16 {
        return None;
    }

    let spendable_sol_in = u64::from_le_bytes(data[0..8].try_into().unwrap());
    let min_tokens_out = u64::from_le_bytes(data[8..16].try_into().unwrap());

    Some(DexEvent::PumpFunTradeEvent(PumpFunTradeEvent {
        metadata,
        global: accounts[0],
        fee_recipient: accounts[1],
        mint: accounts[2],
        bonding_curve: accounts[3],
        associated_bonding_curve: accounts[4],
        associated_user: accounts[5],
        user: accounts[6],
        system_program: accounts[7],
        token_program: accounts[8],
        creator_vault: accounts[9],
        event_authority: accounts[10],
        program: accounts[11],
        global_volume_accumulator: accounts[12],
        user_volume_accumulator: accounts[13],
        fee_config: accounts[14],
        fee_program: accounts[15],
        account: accounts.get(16).copied(),
        max_sol_cost: spendable_sol_in,
        amount: min_tokens_out,
        is_buy: true,
        ..Default::default()
    }))
}

/// Parse sell instruction event.
/// Sell has 14 fixed accounts; some versions pass 17 accounts, index 16 = "Account" on block explorers.
fn parse_sell_instruction(
    data: &[u8],
    accounts: &[Pubkey],
    mut metadata: EventMetadata,
) -> Option<DexEvent> {
    metadata.event_type = EventType::PumpFunSell;

    if data.len() < 16 || accounts.len() < 14 {
        return None;
    }
    let amount = u64::from_le_bytes(data[0..8].try_into().unwrap());
    let min_sol_output = u64::from_le_bytes(data[8..16].try_into().unwrap());
    Some(DexEvent::PumpFunTradeEvent(PumpFunTradeEvent {
        metadata,
        global: accounts[0],
        fee_recipient: accounts[1],
        mint: accounts[2],
        bonding_curve: accounts[3],
        associated_bonding_curve: accounts[4],
        associated_user: accounts[5],
        user: accounts[6],
        system_program: accounts[7],
        creator_vault: accounts[8],
        token_program: accounts[9],
        event_authority: accounts[10],
        program: accounts[11],
        global_volume_accumulator: Pubkey::default(),
        user_volume_accumulator: Pubkey::default(),
        fee_config: accounts[12],
        fee_program: accounts[13],
        account: accounts.get(16).copied(),
        min_sol_output,
        amount,
        is_buy: false,
        ..Default::default()
    }))
}

/// 解析迁移指令事件
/// 共 24 个固定账户: 0: global, 1: withdraw_authority, 2: mint, 3: bonding_curve, 4: associated_bonding_curve,
/// 5: user, 6: system_program, 7: token_program, 8: pump_amm, 9: pool, 10: pool_authority,
/// 11: pool_authority_mint_account, 12: pool_authority_wsol_account, 13: amm_global_config, 14: wsol_mint,
/// 15: lp_mint, 16: user_pool_token_account, 17: pool_base_token_account, 18: pool_quote_token_account,
/// 19: token_2022_program, 20: associated_token_program, 21: pump_amm_event_authority, 22: event_authority, 23: program.
fn parse_migrate_instruction(
    _data: &[u8],
    accounts: &[Pubkey],
    mut metadata: EventMetadata,
) -> Option<DexEvent> {
    metadata.event_type = EventType::PumpFunMigrate;

    if accounts.len() < 24 {
        return None;
    }
    Some(DexEvent::PumpFunMigrateEvent(PumpFunMigrateEvent {
        metadata,
        global: accounts[0],
        withdraw_authority: accounts[1],
        mint: accounts[2],
        bonding_curve: accounts[3],
        associated_bonding_curve: accounts[4],
        user: accounts[5],
        system_program: accounts[6],
        token_program: accounts[7],
        pump_amm: accounts[8],
        pool: accounts[9],
        pool_authority: accounts[10],
        pool_authority_mint_account: accounts[11],
        pool_authority_wsol_account: accounts[12],
        amm_global_config: accounts[13],
        wsol_mint: accounts[14],
        lp_mint: accounts[15],
        user_pool_token_account: accounts[16],
        pool_base_token_account: accounts[17],
        pool_quote_token_account: accounts[18],
        token_2022_program: accounts[19],
        associated_token_program: accounts[20],
        pump_amm_event_authority: accounts[21],
        event_authority: accounts[22],
        program: accounts[23],
        ..Default::default()
    }))
}