// yt - A fully featured command line YouTube client
//
// Copyright (C) 2024 Benedikt Peetz <benedikt.peetz@b-peetz.de>
// SPDX-License-Identifier: GPL-3.0-or-later
//
// This file is part of Yt.
//
// You should have received a copy of the License along with this program.
// If not, see <https://www.gnu.org/licenses/gpl-3.0.txt>.

//! These functions change the database. They are added on a demand basis.

use anyhow::Result;
use chrono::Utc;
use log::{debug, info};
use sqlx::query;
use tokio::fs;

use crate::{app::App, storage::video_database::extractor_hash::ExtractorHash};

use super::{Video, VideoOptions, VideoStatus};

/// Set a new status for a video.
/// This will only update the status time stamp/priority when the status or the priority has changed .
pub async fn set_video_status(
    app: &App,
    video_hash: &ExtractorHash,
    new_status: VideoStatus,
    new_priority: Option<i64>,
) -> Result<()> {
    let video_hash = video_hash.hash().to_string();

    let old = query!(
        r#"
    SELECT status, priority, cache_path
    FROM videos
    WHERE extractor_hash = ?
    "#,
        video_hash
    )
    .fetch_one(&app.database)
    .await?;

    let cache_path = if (VideoStatus::from_db_integer(old.status) == VideoStatus::Cached)
        && (new_status != VideoStatus::Cached)
    {
        None
    } else {
        old.cache_path.as_deref()
    };

    let new_status = new_status.as_db_integer();

    if let Some(new_priority) = new_priority {
        if old.status == new_status && old.priority == new_priority {
            return Ok(());
        }

        let now = Utc::now().timestamp();

        debug!(
            "Running status change: {:#?} -> {:#?}...",
            VideoStatus::from_db_integer(old.status),
            VideoStatus::from_db_integer(new_status),
        );

        query!(
            r#"
        UPDATE videos
        SET status = ?, last_status_change = ?, priority = ?, cache_path = ?
        WHERE extractor_hash = ?;
        "#,
            new_status,
            now,
            new_priority,
            cache_path,
            video_hash
        )
        .execute(&app.database)
        .await?;
    } else {
        if old.status == new_status {
            return Ok(());
        }

        let now = Utc::now().timestamp();

        debug!(
            "Running status change: {:#?} -> {:#?}...",
            VideoStatus::from_db_integer(old.status),
            VideoStatus::from_db_integer(new_status),
        );

        query!(
            r#"
        UPDATE videos
        SET status = ?, last_status_change = ?, cache_path = ?
        WHERE extractor_hash = ?;
        "#,
            new_status,
            now,
            cache_path,
            video_hash
        )
        .execute(&app.database)
        .await?;
    }

    debug!("Finished status change.");
    Ok(())
}

/// Mark a video as watched.
/// This will both set the status to `Watched` and the cache_path to Null.
pub async fn set_video_watched(app: &App, video: &Video) -> Result<()> {
    let video_hash = video.extractor_hash.hash().to_string();
    let new_status = VideoStatus::Watched.as_db_integer();

    info!("Will set video watched: '{}'", video.title);

    let old = query!(
        r#"
    SELECT status, priority
    FROM videos
    WHERE extractor_hash = ?
    "#,
        video_hash
    )
    .fetch_one(&app.database)
    .await?;

    assert_ne!(
        old.status, new_status,
        "The video should not be marked as watched already."
    );
    assert_eq!(
        old.status,
        VideoStatus::Cached.as_db_integer(),
        "The video should have been marked cached"
    );

    let now = Utc::now().timestamp();

    if let Some(path) = &video.cache_path {
        if let Ok(true) = path.try_exists() {
            fs::remove_file(path).await?
        }
    }

    query!(
        r#"
        UPDATE videos
        SET status = ?, last_status_change = ?, cache_path = NULL
        WHERE extractor_hash = ?;
        "#,
        new_status,
        now,
        video_hash
    )
    .execute(&app.database)
    .await?;

    Ok(())
}

pub async fn set_state_change(
    app: &App,
    video_extractor_hash: &ExtractorHash,
    changing: bool,
) -> Result<()> {
    let state_change = if changing { 1 } else { 0 };
    let video_extractor_hash = video_extractor_hash.hash().to_string();

    query!(
        r#"
            UPDATE videos
            SET status_change = ?
            WHERE extractor_hash = ?;
        "#,
        state_change,
        video_extractor_hash,
    )
    .execute(&app.database)
    .await?;

    Ok(())
}

pub async fn set_video_options(
    app: &App,
    hash: &ExtractorHash,
    video_options: &VideoOptions,
) -> Result<()> {
    let video_extractor_hash = hash.hash().to_string();
    let playback_speed = video_options.mpv.playback_speed;
    let subtitle_langs = &video_options.yt_dlp.subtitle_langs;

    query!(
        r#"
            UPDATE video_options
            SET playback_speed = ?, subtitle_langs = ?
            WHERE extractor_hash = ?;
        "#,
        playback_speed,
        subtitle_langs,
        video_extractor_hash,
    )
    .execute(&app.database)
    .await?;

    Ok(())
}

pub async fn add_video(app: &App, video: Video) -> Result<()> {
    let parent_subscription_name = video.parent_subscription_name;

    let thumbnail_url = video.thumbnail_url.map(|val| val.to_string());

    let status = video.status.as_db_integer();
    let status_change = if video.status_change { 1 } else { 0 };
    let url = video.url.to_string();
    let extractor_hash = video.extractor_hash.hash().to_string();

    let default_subtitle_langs = &app.config.select.subtitle_langs;
    let default_mpv_playback_speed = app.config.select.playback_speed;

    query!(
        r#"
        BEGIN;
        INSERT INTO videos (
            parent_subscription_name,
            status,
            status_change,
            last_status_change,
            title,
            url,
            description,
            duration,
            publish_date,
            thumbnail_url,
            extractor_hash)
        VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?);

        INSERT INTO video_options (
            extractor_hash,
            subtitle_langs,
            playback_speed)
        VALUES (?, ?, ?);
        COMMIT;
    "#,
        parent_subscription_name,
        status,
        status_change,
        video.last_status_change,
        video.title,
        url,
        video.description,
        video.duration,
        video.publish_date,
        thumbnail_url,
        extractor_hash,
        extractor_hash,
        default_subtitle_langs,
        default_mpv_playback_speed
    )
    .execute(&app.database)
    .await?;

    Ok(())
}