//! SQLite implementation of the DailyNoteRepository.

use async_trait::async_trait;
use chrono::{NaiveDate, Utc};
use sqlx::SqlitePool;
use goingson_core::{CoreError, DailyNote, DailyNoteId, DailyNoteRepository, Result, UserId};

use crate::utils::{format_datetime, parse_datetime, parse_uuid};

pub struct SqliteDailyNoteRepository {
    pool: SqlitePool,
}

impl SqliteDailyNoteRepository {
    #[tracing::instrument(skip_all)]
    pub fn new(pool: SqlitePool) -> Self {
        Self { pool }
    }
}

#[derive(sqlx::FromRow)]
struct DailyNoteRow {
    id: String,
    user_id: String,
    note_date: String,
    went_well: String,
    could_improve: String,
    is_reviewed: i32,
    reviewed_at: Option<String>,
    created_at: String,
    updated_at: String,
}

impl TryFrom<DailyNoteRow> for DailyNote {
    type Error = CoreError;

    fn try_from(row: DailyNoteRow) -> Result<Self> {
        Ok(DailyNote {
            id: parse_uuid(&row.id)?.into(),
            user_id: parse_uuid(&row.user_id)?.into(),
            note_date: NaiveDate::parse_from_str(&row.note_date, "%Y-%m-%d")
                .map_err(|_| CoreError::parse("Invalid date"))?,
            went_well: row.went_well,
            could_improve: row.could_improve,
            is_reviewed: row.is_reviewed != 0,
            reviewed_at: row.reviewed_at.as_deref().map(parse_datetime).transpose()?,
            created_at: parse_datetime(&row.created_at)?,
            updated_at: parse_datetime(&row.updated_at)?,
        })
    }
}

#[async_trait]
impl DailyNoteRepository for SqliteDailyNoteRepository {
    #[tracing::instrument(skip_all)]
    async fn get_by_date(&self, user_id: UserId, date: NaiveDate) -> Result<Option<DailyNote>> {
        let user_id_str = user_id.to_string();
        let date_str = date.format("%Y-%m-%d").to_string();

        let row: Option<DailyNoteRow> = sqlx::query_as(
            "SELECT id, user_id, note_date, went_well, could_improve, is_reviewed, reviewed_at, created_at, updated_at
             FROM daily_notes
             WHERE user_id = ? AND note_date = ?"
        )
        .bind(&user_id_str)
        .bind(&date_str)
        .fetch_optional(&self.pool)
        .await
        .map_err(CoreError::database)?;

        row.map(DailyNote::try_from).transpose()
    }

    #[tracing::instrument(skip_all)]
    async fn upsert(
        &self,
        user_id: UserId,
        date: NaiveDate,
        went_well: &str,
        could_improve: &str,
        is_reviewed: bool,
    ) -> Result<DailyNote> {
        let user_id_str = user_id.to_string();
        let date_str = date.format("%Y-%m-%d").to_string();
        let now = Utc::now();
        let now_str = format_datetime(&now);
        let reviewed_at_str = if is_reviewed { Some(now_str.clone()) } else { None };

        let existing = self.get_by_date(user_id, date).await?;

        let (id, created_at) = if let Some(ref existing) = existing {
            sqlx::query(
                "UPDATE daily_notes SET went_well = ?, could_improve = ?, is_reviewed = ?, reviewed_at = ?, updated_at = ?
                 WHERE id = ?"
            )
            .bind(went_well)
            .bind(could_improve)
            .bind(is_reviewed as i32)
            .bind(&reviewed_at_str)
            .bind(&now_str)
            .bind(existing.id.to_string())
            .execute(&self.pool)
            .await
            .map_err(CoreError::database)?;

            (existing.id, existing.created_at)
        } else {
            let id = DailyNoteId::new();
            sqlx::query(
                "INSERT INTO daily_notes (id, user_id, note_date, went_well, could_improve, is_reviewed, reviewed_at, created_at, updated_at)
                 VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)"
            )
            .bind(id.to_string())
            .bind(&user_id_str)
            .bind(&date_str)
            .bind(went_well)
            .bind(could_improve)
            .bind(is_reviewed as i32)
            .bind(&reviewed_at_str)
            .bind(&now_str)
            .bind(&now_str)
            .execute(&self.pool)
            .await
            .map_err(CoreError::database)?;

            (id, now)
        };

        Ok(DailyNote {
            id,
            user_id,
            note_date: date,
            went_well: went_well.to_string(),
            could_improve: could_improve.to_string(),
            is_reviewed,
            reviewed_at: reviewed_at_str.as_deref().map(parse_datetime).transpose()?,
            created_at,
            updated_at: now,
        })
    }
}