pub mod dm_unread;
pub mod dms;
pub mod guilds;
pub mod messages;
pub mod social;

use anyhow::Result;
use sqlx::SqlitePool;
use tracing::info;

pub struct Storage {
    pub pool: SqlitePool,
}

impl Storage {
    pub async fn connect(path: &str) -> Result<Self> {
        if let Some(p) = std::path::Path::new(path).parent() {
            tokio::fs::create_dir_all(p).await?;
        }
        let pool = SqlitePool::connect(&format!("sqlite://{}?mode=rwc", path)).await?;
        let s = Self { pool };
        s.migrate().await?;
        info!("storage: {path}");
        Ok(s)
    }

    async fn migrate(&self) -> Result<()> {
        sqlx::query(
            "CREATE TABLE IF NOT EXISTS messages (
                id TEXT PRIMARY KEY, channel_id TEXT NOT NULL,
                sender_id TEXT NOT NULL, content TEXT NOT NULL,
                timestamp INTEGER NOT NULL
             );
             CREATE INDEX IF NOT EXISTS idx_msg_ch ON messages (channel_id, timestamp);
             CREATE TABLE IF NOT EXISTS users (
                pubkey TEXT PRIMARY KEY, nickname TEXT NOT NULL, first_seen INTEGER NOT NULL
             );
              CREATE TABLE IF NOT EXISTS channels (
                 id TEXT PRIMARY KEY,
                 name TEXT NOT NULL,
                 kind TEXT NOT NULL DEFAULT 'text',
                 created_at INTEGER NOT NULL
              );
              CREATE TABLE IF NOT EXISTS bans (
                pubkey TEXT PRIMARY KEY, reason TEXT, banned_at INTEGER NOT NULL
             );
             CREATE TABLE IF NOT EXISTS direct_messages (
                id TEXT PRIMARY KEY,
                user1_id TEXT NOT NULL,
                user2_id TEXT NOT NULL,
                created_at INTEGER NOT NULL,
                last_message_at INTEGER,
                unread_count_1 INTEGER NOT NULL DEFAULT 0,
                unread_count_2 INTEGER NOT NULL DEFAULT 0,
                UNIQUE(user1_id, user2_id)
             );
             CREATE TABLE IF NOT EXISTS dm_messages (
                id TEXT PRIMARY KEY,
                dm_id TEXT NOT NULL REFERENCES direct_messages(id),
                sender_id TEXT NOT NULL,
                body TEXT NOT NULL,
                created_at INTEGER NOT NULL
             );
             CREATE INDEX IF NOT EXISTS idx_dm_msg_dm ON dm_messages(dm_id, created_at);
             -- Guild system (Phase 1.2)
             CREATE TABLE IF NOT EXISTS guilds (
                id TEXT PRIMARY KEY, owner_id TEXT NOT NULL, name TEXT NOT NULL,
                created_at INTEGER NOT NULL
             );
             CREATE TABLE IF NOT EXISTS guild_members (
                guild_id TEXT NOT NULL, user_id TEXT NOT NULL,
                joined_at INTEGER NOT NULL, PRIMARY KEY(guild_id, user_id)
             );
             CREATE INDEX IF NOT EXISTS idx_gm_user ON guild_members(user_id);
             CREATE TABLE IF NOT EXISTS roles (
                id TEXT PRIMARY KEY, guild_id TEXT NOT NULL, name TEXT NOT NULL,
                color TEXT NOT NULL DEFAULT '#ffffff',
                permissions INTEGER NOT NULL DEFAULT 0,
                position INTEGER NOT NULL DEFAULT 0,
                created_at INTEGER NOT NULL
             );
             CREATE INDEX IF NOT EXISTS idx_roles_guild ON roles(guild_id);
             CREATE TABLE IF NOT EXISTS invites (
                id TEXT PRIMARY KEY, guild_id TEXT NOT NULL, creator_id TEXT NOT NULL,
                code TEXT NOT NULL UNIQUE, max_uses INTEGER,
                uses INTEGER NOT NULL DEFAULT 0,
                expires_at INTEGER, created_at INTEGER NOT NULL
             );
             CREATE INDEX IF NOT EXISTS idx_invites_code ON invites(code);
              CREATE TABLE IF NOT EXISTS member_roles (
                 guild_id TEXT NOT NULL, user_id TEXT NOT NULL, role_id TEXT NOT NULL,
                 PRIMARY KEY(guild_id, user_id, role_id)
              );
              -- Friends system (Phase 1.2)
             CREATE TABLE IF NOT EXISTS friend_requests (
                id TEXT PRIMARY KEY, from_user_id TEXT NOT NULL, to_user_id TEXT NOT NULL,
                status TEXT NOT NULL DEFAULT 'PENDING', created_at INTEGER NOT NULL,
                UNIQUE(from_user_id, to_user_id)
             );
             CREATE TABLE IF NOT EXISTS friendships (
                user_id_1 TEXT NOT NULL, user_id_2 TEXT NOT NULL,
                created_at INTEGER NOT NULL, PRIMARY KEY(user_id_1, user_id_2)
             );
              CREATE TABLE IF NOT EXISTS read_receipts (
                 channel_id TEXT NOT NULL, user_id TEXT NOT NULL,
                 last_read_message_id TEXT NOT NULL, updated_at INTEGER NOT NULL,
                 PRIMARY KEY(channel_id, user_id)
              );
              CREATE TABLE IF NOT EXISTS blocks (
                 blocker_id TEXT NOT NULL, blocked_id TEXT NOT NULL,
                 created_at INTEGER NOT NULL, PRIMARY KEY(blocker_id, blocked_id)
              );
               CREATE TABLE IF NOT EXISTS reactions (
                  message_id TEXT, user_id TEXT, emoji TEXT, created_at INTEGER,
                  PRIMARY KEY(message_id, user_id, emoji)
               );
               CREATE TABLE IF NOT EXISTS audit_logs (
                  id TEXT PRIMARY KEY, guild_id TEXT NOT NULL, actor_id TEXT NOT NULL,
                  action TEXT NOT NULL, target_id TEXT,
                  target_type TEXT, reason TEXT, changes TEXT,
                  created_at INTEGER NOT NULL
               );
               CREATE INDEX IF NOT EXISTS idx_audit_guild ON audit_logs(guild_id, created_at);",
        )
        .execute(&self.pool)
        .await?;

        // Lightweight migrations for pre-existing databases (idempotent).
        self.ensure_column("messages", "reply_to", "TEXT").await?;
        Ok(())
    }

    /// Add a column to a table if it doesn't already exist. Idempotent.
    /// Only called with hardcoded literals — safe to bypass sqlx SqlSafeStr check.
    async fn ensure_column(
        &self,
        table: &'static str,
        col: &'static str,
        decl: &'static str,
    ) -> Result<()> {
        use sqlx::AssertSqlSafe;
        // PRAGMA + ALTER can't use bind parameters in SQLite; use AssertSqlSafe
        // with hardcoded literals only — never user input.
        type PragmaRow = (i64, String, String, i64, Option<String>, i64);
        let pragma = format!("PRAGMA table_info({table})");
        let rows: Result<Vec<PragmaRow>, _> =
            sqlx::query_as::<_, PragmaRow>(AssertSqlSafe(pragma.clone()))
                .fetch_all(&self.pool)
                .await;
        let rows = match rows {
            Ok(r) => r,
            Err(e) => {
                tracing::warn!("ensure_column: PRAGMA failed: {e}");
                return Ok(());
            }
        };
        if rows.iter().any(|(_, name, _, _, _, _)| name == col) {
            return Ok(());
        }
        let alter = format!("ALTER TABLE {table} ADD COLUMN {col} {decl}");
        sqlx::query(AssertSqlSafe(alter))
            .execute(&self.pool)
            .await?;
        info!("storage: added column {table}.{col}");
        Ok(())
    }

    pub async fn upsert_user(&self, pubkey: &str, nickname: &str) -> Result<()> {
        sqlx::query("INSERT OR IGNORE INTO users (pubkey,nickname,first_seen) VALUES (?,?,?)")
            .bind(pubkey)
            .bind(nickname)
            .bind(now_ms())
            .execute(&self.pool)
            .await?;
        Ok(())
    }

    pub async fn is_banned(&self, pubkey: &str) -> Result<bool> {
        Ok(
            sqlx::query_as::<_, (String,)>("SELECT pubkey FROM bans WHERE pubkey=?")
                .bind(pubkey)
                .fetch_optional(&self.pool)
                .await?
                .is_some(),
        )
    }

    pub async fn append_audit_log(
        &self,
        guild_id: &str,
        actor_id: &str,
        action: &str,
        target_id: Option<&str>,
        target_type: Option<&str>,
        reason: Option<&str>,
    ) -> Result<()> {
        let id = uuid::Uuid::new_v4().to_string();
        let now = now_ms();
        sqlx::query(
            "INSERT INTO audit_logs (id,guild_id,actor_id,action,target_id,target_type,reason,created_at) \
             VALUES (?,?,?,?,?,?,?,?)",
        )
        .bind(&id)
        .bind(guild_id)
        .bind(actor_id)
        .bind(action)
        .bind(target_id)
        .bind(target_type)
        .bind(reason)
        .bind(now)
        .execute(&self.pool)
        .await?;
        Ok(())
    }
}

pub(crate) fn generate_invite_code() -> String {
    use std::collections::hash_map::RandomState;
    use std::hash::{BuildHasher, Hasher};
    let hash = RandomState::new().build_hasher().finish();
    format!("{:08x}", hash % 0x100000000u64)
}

use crate::domain::channels::{ChannelKind, ChannelStore};

#[derive(Debug, Clone)]
pub struct ChannelRecord {
    pub id: String,
    pub name: String,
    pub kind: String,
    pub created_at: i64,
}

impl Storage {
    pub async fn create_channel(&self, id: &str, name: &str, kind: &str) -> Result<bool> {
        let result = sqlx::query(
            "INSERT OR IGNORE INTO channels (id, name, kind, created_at) VALUES (?, ?, ?, ?)",
        )
        .bind(id)
        .bind(name)
        .bind(kind)
        .bind(now_ms())
        .execute(&self.pool)
        .await?;
        Ok(result.rows_affected() > 0)
    }

    pub async fn delete_channel(&self, id: &str) -> Result<bool> {
        let result = sqlx::query("DELETE FROM channels WHERE id=?")
            .bind(id)
            .execute(&self.pool)
            .await?;
        Ok(result.rows_affected() > 0)
    }

    pub async fn list_channels(&self) -> Result<Vec<ChannelRecord>> {
        let rows = sqlx::query_as::<_, (String, String, String, i64)>(
            "SELECT id, name, kind, created_at FROM channels",
        )
        .fetch_all(&self.pool)
        .await?
        .into_iter()
        .map(|(id, name, kind, created_at)| ChannelRecord {
            id,
            name,
            kind,
            created_at,
        })
        .collect();
        Ok(rows)
    }

    pub async fn load_channels_to_cache(&self, channel_store: &ChannelStore) -> Result<()> {
        let channels = self.list_channels().await?;
        for ch in channels {
            let kind = match ch.kind.as_str() {
                "voice" => ChannelKind::Voice,
                _ => ChannelKind::Text,
            };
            crate::domain::channels::create(channel_store, &ch.id, &ch.name, kind).await;
        }
        Ok(())
    }
}

pub(crate) fn now_ms() -> i64 {
    std::time::SystemTime::now()
        .duration_since(std::time::UNIX_EPOCH)
        .unwrap_or_default()
        .as_millis() as i64
}