use rusqlite::Connection;
use serde::{Deserialize, Serialize};
use strum::IntoStaticStr;
use uuid::Uuid;

use crate::{database::DatabaseError, users::User};

#[derive(Debug)]
pub struct LogEntry {
    pub id: Uuid,
    pub actor: User,
    pub data: LogAction,
}

impl LogEntry {
    pub fn new(conn: &Connection, actor: User, data: LogAction) -> Result<LogEntry, DatabaseError> {
        let log = LogEntry {
            id: Uuid::now_v7(),
            actor,
            data,
        };
        let actiontype: &'static str = (&log.data).into();
        let payload = serde_json::to_string(&log.data).unwrap();
        conn.prepare(
            "INSERT INTO logs(id, actor, target, actiontype, payload) VALUES (?1,?2,?3,?4,?5)",
        )?
        .execute((
            &log.id,
            &log.actor.id,
            log.data.get_target_id(),
            actiontype,
            payload,
        ))?;
        Ok(log)
    }
    pub fn total_count(conn: &Connection) -> Result<i64, DatabaseError> {
        Ok(conn.query_row("SELECT COUNT(*) FROM logs", (), |r| r.get(0))?)
    }
    pub fn get_chronological_offset(
        conn: &Connection,
        offset: i64,
        limit: i64,
    ) -> Result<Vec<LogEntry>, DatabaseError> {
        Ok(conn
            .prepare("SELECT id, actor, target, actiontype, payload FROM logs ORDER BY id DESC LIMIT ?1 OFFSET ?2")?
            .query_map((limit, offset), |r| {
                let payload: String = r.get(4)?;
                Ok(LogEntry {
                    id: r.get(0)?,
                    actor: User::get_by_id(conn, r.get(1)?).unwrap(),
                    data: serde_json::from_str(&payload).unwrap(),
                })
            })?
            .collect::<Result<Vec<LogEntry>, _>>()?)
    }
}

// #[derive(Debug, thiserror::Error)]
// pub enum LogError {}

#[derive(Debug, IntoStaticStr, Serialize, Deserialize)]
pub enum LogAction {
    Initialize,
    RegenInfradmin,
    CreateUser {
        id: Uuid,
        handle: String,
    },
    ManuallyChangeUsersPassword {
        id: Uuid,
    },
    CreateTag {
        id: Uuid,
        name: String,
    },
    RenameTag {
        id: Uuid,
        on: String,
        nn: String,
    },
    DeleteTag {
        id: Uuid,
        name: String,
    },
    CreatePerson {
        id: Uuid,
        pname: String,
    },
    ChangeUserHandle {
        id: Uuid,
        old: String,
        new: String,
    },
    AddPersonName {
        pid: Uuid,  // person id
        nid: Uuid,  // name id
        pn: String, // primary name
        nn: String, // new name
    },
    SetPersonPrimaryName {
        pid: Uuid,  // person id
        nid: Uuid,  // name id
        on: String, // old name
        nn: String, // new name
    },
    CreateQuote {
        id: Uuid,
    },
    ManuallyRevokeSession {
        id: Uuid,
    },
}
impl LogAction {
    pub fn get_target_id(&self) -> Option<Uuid> {
        match self {
            Self::Initialize | Self::RegenInfradmin => None,
            Self::CreateUser { id, .. }
            | Self::CreateTag { id, .. }
            | Self::CreatePerson { id, .. }
            | Self::ChangeUserHandle { id, .. }
            | Self::CreateQuote { id }
            | Self::ManuallyRevokeSession { id }
            | Self::RenameTag { id, .. }
            | Self::DeleteTag { id, .. }
            | Self::ManuallyChangeUsersPassword { id } => Some(*id),
            Self::AddPersonName { pid, .. } | Self::SetPersonPrimaryName { pid, .. } => Some(*pid),
        }
    }
    pub fn get_humanreadable_payload(&self) -> String {
        match self {
            LogAction::Initialize => format!("Initialized Mnemosyne."),
            LogAction::RegenInfradmin => format!("Regenerated the Infradmin account."),
            LogAction::CreateUser { id, handle } => {
                format!("Created user @{handle} (uid: {id})")
            }
            LogAction::ManuallyChangeUsersPassword { id } => {
                format!("Manually changed password of user with id: {id}")
            }
            LogAction::CreateTag { id, name } => {
                format!("Created tag #{name} (id: {id})")
            }
            LogAction::RenameTag { id, on, nn } => {
                format!("Renamed tag #{on} -> #{nn} (id: {id})")
            }
            LogAction::DeleteTag { id, name } => {
                format!("Deleted tag #{name} (id: {id})")
            }
            LogAction::CreatePerson { id, pname } => {
                format!("Created person ~{pname} (id: {id})")
            }
            LogAction::ChangeUserHandle { id, old, new } => {
                format!("Changed user handle @{old} -> @{new} (uid: {id})")
            }
            LogAction::AddPersonName { pid, nid, pn, nn } => {
                format!("Added name \"{nn}\" to ~{pn} (pid: {pid}; nid: {nid})")
            }
            LogAction::SetPersonPrimaryName { pid, nid, on, nn } => {
                format!("~{on} now has primary name \"{nn}\" (pid: {pid}; nid: {nid})")
            }
            LogAction::CreateQuote { id } => {
                format!("Created quote of ID {id}")
            }
            LogAction::ManuallyRevokeSession { id } => {
                format!("Revoked session of ID {id}")
            }
        }
    }
}