#![allow(unknown_lints)]

use std::{
    fmt::{Display, Formatter},
    sync::{Arc, Mutex},
};

use clx::progress::{ProgressJob, ProgressJobBuilder, ProgressStatus};
use std::sync::LazyLock as Lazy;

use crate::ui::style;
use crate::{backend, ui};

#[derive(Debug, Clone, Copy)]
pub enum ProgressIcon {
    Success,
    Skipped,
    #[allow(dead_code)]
    Warning,
    // Constructed only by the brew package managers (`#[cfg(unix)]`), so it reads
    // as never-constructed on the windows build.
    #[cfg_attr(windows, allow(dead_code))]
    Error,
}

impl Display for ProgressIcon {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        match self {
            ProgressIcon::Success => write!(f, "{}", style::egreen("✓").bright()),
            ProgressIcon::Skipped => write!(f, "{}", style::eyellow("⇢").bright()),
            ProgressIcon::Warning => write!(f, "{}", style::eyellow("⚠").bright()),
            ProgressIcon::Error => write!(f, "{}", style::ered("✗").bright()),
        }
    }
}

pub trait SingleReport: Send + Sync + std::fmt::Debug {
    fn println(&self, _message: String) {}
    fn set_message(&self, _message: String) {}
    fn inc(&self, _delta: u64) {}
    fn set_position(&self, _delta: u64) {}
    fn set_length(&self, _length: u64) {}
    fn abandon(&self) {}
    fn finish(&self) {
        self.finish_with_message(String::new());
    }
    fn finish_with_message(&self, message: String) {
        self.finish_with_icon(message, ProgressIcon::Success);
    }
    fn finish_with_icon(&self, _message: String, _icon: ProgressIcon) {}

    /// Declare how many operations this progress report will have
    /// Each operation will get equal space (1/count)
    /// For example, if there are 3 operations (download, checksum, extract):
    /// - start_operations(3) at the beginning
    ///
    /// Then each set_length() call will allocate 33.33% of the total progress
    fn start_operations(&self, _count: usize) {}

    /// Advance to the next operation
    /// Call this before each new stage (after the first one)
    fn next_operation(&self) {}
}

static LONGEST_PLUGIN_NAME: Lazy<usize> = Lazy::new(|| {
    backend::list()
        .into_iter()
        .map(|p| p.id().len())
        .max()
        .unwrap_or_default()
        .clamp(15, 35)
});

fn pad_prefix(w: usize, s: &str) -> String {
    console::pad_str(s, w, console::Alignment::Left, None).to_string()
}

fn normal_prefix(pad: usize, prefix: &str) -> String {
    pad_prefix(pad, prefix)
}

/// clx-based progress report implementation
#[derive(Debug)]
pub struct ProgressReport {
    job: Arc<ProgressJob>,
}

impl ProgressReport {
    pub fn new(prefix: String) -> ProgressReport {
        Self::new_with_pad(prefix, *LONGEST_PLUGIN_NAME)
    }

    pub fn new_with_pad(prefix: String, pad: usize) -> ProgressReport {
        ui::ctrlc::show_cursor_after_ctrl_c();
        let formatted_prefix = normal_prefix(pad, &prefix);

        // Template: prefix + message + optional bytes/progress bar + spinner on right
        // Use flex_fill to pad message and push progress bar to right edge
        // Use "arc" spinner style instead of default mini_dot
        // clx's bytes() function shows actual byte values for the current operation
        // while clx handles the multi-operation mapping internally for OSC progress
        // Use bytes(total=false, hide_complete=true) to show only current bytes and hide on completion
        let body = "{{ prefix }} {{ message | flex_fill }} {% if total %}{{ bytes(total=false, hide_complete=true) }} {{ eta(hide_complete=true) }} {{ progress_bar(width=20, hide_complete=true) }} {% endif %}{{ spinner(name=\"arc\") }}";

        let job = ProgressJobBuilder::new()
            .body(body)
            .prop("prefix", &formatted_prefix)
            .prop("message", "")
            .start();

        ProgressReport { job }
    }
}

impl SingleReport for ProgressReport {
    fn println(&self, message: String) {
        self.job.println(&message);
    }

    fn set_message(&self, message: String) {
        self.job.prop("message", &message.replace('\r', ""));
    }

    fn inc(&self, delta: u64) {
        self.job.increment(delta as usize);
    }

    fn set_position(&self, pos: u64) {
        self.job.progress_current(pos as usize);
    }

    fn set_length(&self, length: u64) {
        self.job.progress_total(length as usize);
    }

    fn abandon(&self) {
        self.job.set_status(ProgressStatus::Hide);
    }

    fn finish_with_icon(&self, _message: String, icon: ProgressIcon) {
        // Set status based on icon
        match icon {
            ProgressIcon::Success => self.job.set_status(ProgressStatus::Done),
            ProgressIcon::Error => self.job.set_status(ProgressStatus::Failed),
            ProgressIcon::Warning => self.job.set_status(ProgressStatus::Warn),
            ProgressIcon::Skipped => self.job.set_status(ProgressStatus::Done),
        }
    }

    fn start_operations(&self, count: usize) {
        self.job.start_operations(count);
    }

    fn next_operation(&self) {
        self.job.next_operation();
    }
}

#[derive(Debug)]
pub struct QuietReport {}

impl QuietReport {
    pub fn new() -> QuietReport {
        QuietReport {}
    }
}

impl SingleReport for QuietReport {}

#[derive(Debug)]
pub struct VerboseReport {
    prefix: String,
    prev_message: Mutex<String>,
    pad: usize,
    total_operations: Mutex<Option<usize>>,
    current_operation: Mutex<usize>,
}

impl VerboseReport {
    pub fn new(prefix: String) -> VerboseReport {
        Self::new_with_pad(prefix, *LONGEST_PLUGIN_NAME)
    }

    pub fn new_with_pad(prefix: String, pad: usize) -> VerboseReport {
        VerboseReport {
            prefix,
            prev_message: Mutex::new("".to_string()),
            pad,
            total_operations: Mutex::new(None),
            current_operation: Mutex::new(0),
        }
    }
}

impl SingleReport for VerboseReport {
    fn println(&self, message: String) {
        safe_eprintln!("{message}");
    }
    fn set_message(&self, message: String) {
        let mut prev_message = self.prev_message.lock().unwrap();
        if *prev_message == message {
            return;
        }
        let total = *self.total_operations.lock().unwrap();
        let current = *self.current_operation.lock().unwrap();
        let formatted = if let Some(total) = total {
            format!("[{}/{}] {}", current, total, message)
        } else {
            message.clone()
        };
        let prefix = pad_prefix(self.pad, &self.prefix);
        log::info!("{prefix} {formatted}");
        *prev_message = message;
    }
    fn finish(&self) {
        self.finish_with_message(style::egreen("done").to_string());
    }
    fn finish_with_icon(&self, message: String, icon: ProgressIcon) {
        let prefix = pad_prefix(self.pad - 2, &self.prefix);
        log::info!("{prefix} {icon} {message}");
    }
    fn start_operations(&self, count: usize) {
        *self.total_operations.lock().unwrap() = Some(count.max(1));
        *self.current_operation.lock().unwrap() = 1;
    }
    fn next_operation(&self) {
        let total = *self.total_operations.lock().unwrap();
        if total.is_some() {
            let mut current = self.current_operation.lock().unwrap();
            *current += 1;
        }
    }
}

#[cfg(test)]
mod tests {
    use crate::config::Config;

    use super::*;

    #[tokio::test]
    async fn test_progress_report() {
        let _config = Config::get().await.unwrap();
        let pr = ProgressReport::new("foo".into());
        pr.set_message("message".into());
        pr.finish_with_message("message".into());
    }

    #[tokio::test]
    async fn test_progress_report_verbose() {
        let _config = Config::get().await.unwrap();
        let pr = VerboseReport::new("PREFIX".to_string());
        pr.set_message("message".into());
        pr.finish_with_message("message".into());
    }

    #[tokio::test]
    async fn test_progress_report_quiet() {
        let _config = Config::get().await.unwrap();
        let pr = QuietReport::new();
        pr.set_message("message".into());
        pr.finish_with_message("message".into());
    }
}
