// Attachments in the window: the chips above the message box, the ＋ button, dropping files on
// the window, pasting a picture with ⌘V, and the thumbnails in sent messages.

use super::*;
use crate::attach::{self, Attachment};

#[derive(Default)]
pub struct AttachUi {
    pub pending: HashMap<u64, Vec<Attachment>>,
    picked: Option<Receiver<(u64, Vec<PathBuf>)>>,
    thumbs: HashMap<String, Option<egui::TextureHandle>>,
    pub error: Option<String>,
    voice: Option<(u64, crate::voice::Recording)>,
    voice_rx: Option<Receiver<(u64, Result<String, String>)>>,
    /// The recording is a meeting (longer; becomes a transcript to summarize).
    pub meeting: bool,
    /// 通話模式: the bot being talked to, and where the call is.
    pub call: Option<(u64, CallPhase)>,
    call_rec: Option<crate::voice::Recording>,
    call_rx: Option<Receiver<Result<String, String>>>,
}

#[derive(Clone, Copy, PartialEq, Debug)]
pub enum CallPhase {
    Listening,
    Transcribing,
    Thinking,
    Speaking,
}

impl CallPhase {
    pub fn label(self) -> &'static str {
        match self {
            CallPhase::Listening => "正在聽…",
            CallPhase::Transcribing => "聽懂中…",
            CallPhase::Thinking => "想一下…",
            CallPhase::Speaking => "正在說…",
        }
    }
}

impl App {
    fn add_attachment_paths(&mut self, bot_id: u64, paths: Vec<PathBuf>) {
        for path in paths {
            match attach::store(bot_id, &path) {
                Ok(a) => self.att.pending.entry(bot_id).or_default().push(a),
                Err(e) => self.att.error = Some(e),
            }
        }
    }

    /// Files dropped on the window, the picker's answer, and ⌘V with a picture on the clipboard.
    pub(super) fn attachments_poll(&mut self, ctx: &egui::Context, bot_id: u64, composer_focused: bool) {
        let dropped: Vec<PathBuf> = ctx.input(|i| i.raw.dropped_files.iter().map(|f| f.path().to_path_buf()).filter(|p| !p.as_os_str().is_empty()).collect());
        if !dropped.is_empty() {
            self.add_attachment_paths(bot_id, dropped);
        }
        if let Some(rx) = &self.att.picked {
            if let Ok((id, paths)) = rx.try_recv() {
                self.att.picked = None;
                self.add_attachment_paths(id, paths);
            }
        }
        // ⌘V with no text on the clipboard: maybe a picture.
        let pasted_text = ctx.input(|i| i.events.iter().any(|e| matches!(e, egui::Event::Paste(t) if !t.is_empty())));
        let cmd_v = ctx.input(|i| i.events.iter().any(|e| matches!(e, egui::Event::Key { key: Key::V, pressed: true, modifiers, .. } if modifiers.command)));
        if composer_focused && cmd_v && !pasted_text && !self.demo {
            if let Some(a) = attach::paste_image(bot_id) {
                self.att.pending.entry(bot_id).or_default().push(a);
            }
        }
    }

    pub(super) fn pick_attachments(&mut self, ctx: &egui::Context, bot_id: u64) {
        let (tx, rx) = channel();
        self.att.picked = Some(rx);
        let c = ctx.clone();
        std::thread::spawn(move || {
            let paths = attach::pick_files();
            let _ = tx.send((bot_id, paths));
            c.request_repaint();
        });
    }

    /// "Drop to attach" while files hover over the window.
    pub(super) fn drop_overlay(&self, ctx: &egui::Context) {
        if !ctx.input(|i| !i.raw.hovered_files.is_empty()) {
            return;
        }
        let p = self.pal;
        let screen = ctx.content_rect();
        let painter = ctx.layer_painter(egui::LayerId::new(egui::Order::Foreground, egui::Id::unique("drop-overlay")));
        painter.rect_filled(screen, 0, p.pane.gamma_multiply(0.85));
        let inner = screen.shrink(24.0);
        painter.rect_stroke(inner, 18, Stroke::new(2.0, p.accent), egui::StrokeKind::Inside);
        painter.text(inner.center(), egui::Align2::CENTER_CENTER, "放開以附加檔案", egui::FontId::proportional(FONT_XL), p.accent);
    }

    fn thumb(&mut self, ctx: &egui::Context, path: &str) -> Option<egui::TextureHandle> {
        if let Some(t) = self.att.thumbs.get(path) {
            return t.clone();
        }
        let t = image::open(path).ok().map(|img| {
            let img = img.thumbnail(240, 240).to_rgba8();
            let size = [img.width() as usize, img.height() as usize];
            ctx.load_texture(format!("thumb-{path}"), egui::ColorImage::from_rgba_unmultiplied(size, img.as_raw()), egui::TextureOptions::LINEAR)
        });
        self.att.thumbs.insert(path.to_string(), t.clone());
        t
    }

    /// One attachment: a picture thumbnail, or a file chip. Returns true when its × was clicked.
    pub(super) fn attachment_chip(&mut self, ui: &mut egui::Ui, a: &Attachment, removable: bool) -> bool {
        let p = self.pal;
        let ctx = ui.ctx().clone();
        let mut remove = false;
        let thumb = if a.image { self.thumb(&ctx, &a.path) } else { None };
        let frame = Frame::new().fill(p.hover).corner_radius(10).inner_margin(if thumb.is_some() { Margin::same(3) } else { Margin::symmetric(10, 6) });
        let r = frame
            .show(ui, |ui| {
                ui.horizontal(|ui| {
                    if let Some(t) = &thumb {
                        let s = t.size_vec2();
                        let k = (64.0 / s.y).min(120.0 / s.x);
                        ui.add(egui::Image::new((t.id(), s * k)).corner_radius(8));
                    } else {
                        let (rect, _) = ui.allocate_exact_size(vec2(14.0, 16.0), egui::Sense::hover());
                        let r = rect.shrink2(vec2(1.5, 1.0));
                        ui.painter().rect_stroke(r, 2.0, Stroke::new(1.3, p.text2), egui::StrokeKind::Middle);
                        ui.painter().line_segment([r.left_top() + vec2(3.0, 5.0), r.right_top() + vec2(-3.0, 5.0)], Stroke::new(1.0, p.text3));
                        ui.painter().line_segment([r.left_top() + vec2(3.0, 8.5), r.right_top() + vec2(-3.0, 8.5)], Stroke::new(1.0, p.text3));
                        ui.vertical(|ui| {
                            ui.spacing_mut().item_spacing.y = 0.0;
                            let name: String = a.name.chars().take(28).collect();
                            ui.label(RichText::new(name).size(FONT_XS).color(p.text));
                            ui.label(RichText::new(attach::human(a.bytes)).size(10.5).color(p.text3));
                        });
                    }
                    if removable && ui.add(egui::Button::new(RichText::new("×").size(13.0).color(p.text3)).frame(false)).on_hover_text(t("移除")).clicked() {
                        remove = true;
                    }
                });
            })
            .response;
        if !removable && r.interact(egui::Sense::click()).on_hover_text(t("打開")).clicked() {
            crate::preview::open_with_system(&a.path);
        }
        remove
    }

    /// The chips above the message box.
    pub(super) fn pending_chips(&mut self, ui: &mut egui::Ui, bot_id: u64) {
        let list = self.att.pending.get(&bot_id).cloned().unwrap_or_default();
        if list.is_empty() && self.att.error.is_none() {
            return;
        }
        let mut remove = None;
        ui.horizontal_wrapped(|ui| {
            for (i, a) in list.iter().enumerate() {
                if self.attachment_chip(ui, a, true) {
                    remove = Some(i);
                }
            }
        });
        if let Some(i) = remove {
            if let Some(v) = self.att.pending.get_mut(&bot_id) {
                let a = v.remove(i);
                let _ = std::fs::remove_file(&a.path);
            }
        }
        if let Some(e) = self.att.error.clone() {
            ui.horizontal(|ui| {
                ui.label(RichText::new(e).size(FONT_XS).color(self.pal.danger));
                if ui.add(egui::Button::new(RichText::new(t("知道了")).size(FONT_XS)).frame(false)).clicked() {
                    self.att.error = None;
                }
            });
        }
        ui.add_space(4.0);
    }

    /// Take this bot's pending attachments for a message (copying them onto its own computer when
    /// it's running).
    pub(super) fn take_attachments(&mut self, bot_id: u64) -> Vec<Attachment> {
        let mut list = self.att.pending.remove(&bot_id).unwrap_or_default();
        for a in list.iter_mut() {
            if let Ok(dst) = crate::cloudbox::copy_in(&a.path, bot_id, &a.name) {
                a.on_box = dst;
            }
        }
        list
    }

    pub(super) fn has_pending_attachments(&self, bot_id: u64) -> bool {
        self.att.pending.get(&bot_id).map(|v| !v.is_empty()).unwrap_or(false)
    }
}

// ---------- 語音輸入 ----------

impl App {
    pub(super) fn voice_recording(&self, bot_id: u64) -> Option<Instant> {
        self.att.voice.as_ref().filter(|(id, _)| *id == bot_id).map(|(_, r)| r.started)
    }

    pub(super) fn voice_busy(&self) -> bool {
        self.att.voice_rx.is_some()
    }

    /// The mic button: start, or stop and turn the recording into text.
    pub(super) fn voice_toggle(&mut self, ctx: &egui::Context, bot_id: u64) {
        if let Some((id, rec)) = self.att.voice.take() {
            let lang = self.state.bot(id).map(|b| b.voice_lang.clone()).unwrap_or_default();
            let ps = self.state.provider(ProviderKind::OpenAi);
            let base = providers::resolve_base(ProviderKind::OpenAi, &ps.base_url);
            let key = providers::resolve_key(ProviderKind::OpenAi, &ps.api_key);
            let (tx, rx) = channel();
            self.att.voice_rx = Some(rx);
            let c = ctx.clone();
            std::thread::spawn(move || {
                let r = rec.finish().and_then(|f| {
                    let t = crate::voice::transcribe_lang(&base, &key, &f, &lang);
                    let _ = std::fs::remove_file(&f);
                    t
                });
                let _ = tx.send((id, r));
                c.request_repaint();
            });
            return;
        }
        crate::voice::stop_speaking();
        match crate::voice::start() {
            Ok(r) => self.att.voice = Some((bot_id, r)),
            Err(e) => self.att.error = Some(e),
        }
    }

    /// 會議記錄: a long recording that becomes a transcript for the bot to summarize.
    pub(super) fn start_meeting(&mut self, ctx: &egui::Context, bot_id: u64) {
        if self.att.voice.is_some() {
            return;
        }
        self.att.meeting = true;
        self.voice_toggle(ctx, bot_id);
        if self.att.voice.is_none() {
            self.att.meeting = false;
        }
    }

    pub(super) fn meeting_on(&self) -> bool {
        self.att.meeting && self.att.voice.is_some()
    }

    /// Put the text where the person was typing.
    pub(super) fn voice_poll(&mut self) {
        let max = if self.att.meeting { crate::voice::MEETING_MAX_SECS } else { crate::voice::MAX_SECS };
        if let Some((started, max)) = self.att.voice.as_ref().map(|(_, r)| (r.started, max)) {
            if started.elapsed().as_secs() >= max {
                if let Some((_, r)) = self.att.voice.take() {
                    r.cancel();
                }
                self.att.error = Some("錄音最長 10 分鐘，已經停止。".into());
            }
        }
        let Some(rx) = &self.att.voice_rx else { return };
        if let Ok((id, r)) = rx.try_recv() {
            self.att.voice_rx = None;
            let meeting = std::mem::take(&mut self.att.meeting);
            match r {
                Ok(t) if t.is_empty() => self.att.error = Some("沒有聽到說話。".into()),
                Ok(t) if meeting => {
                    // The transcript goes with the message as a file; the bot is asked to sum it up.
                    let dir = std::env::temp_dir().join("anybot-meetings");
                    let _ = std::fs::create_dir_all(&dir);
                    let file = dir.join(format!("會議記錄 {}.txt", chrono::Local::now().format("%Y-%m-%d %H%M")));
                    match std::fs::write(&file, &t).map_err(|e| e.to_string()).and_then(|_| crate::attach::store(id, &file)) {
                        Ok(a) => {
                            self.att.pending.entry(id).or_default().push(a);
                            self.drafts.insert(id, "這是剛才會議的文字記錄，請整理：重點、做了哪些決定、待辦事項（誰、做什麼、什麼時候）。".into());
                        }
                        Err(e) => self.att.error = Some(format!("存不了會議記錄：{e}")),
                    }
                }
                Ok(t) => {
                    let d = self.drafts.entry(id).or_default();
                    if !d.is_empty() && !d.ends_with([' ', '\n']) {
                        d.push(' ');
                    }
                    d.push_str(&t);
                }
                Err(e) => self.att.error = Some(e),
            }
        }
    }
}

// ---------- 通話模式 ----------

impl App {
    pub(super) fn call_start(&mut self, bot_id: u64) {
        crate::voice::stop_speaking();
        self.att.call = Some((bot_id, CallPhase::Listening));
        self.att.call_rec = None;
        self.att.call_rx = None;
    }

    pub(super) fn call_end(&mut self) {
        if let Some(r) = self.att.call_rec.take() {
            r.cancel();
        }
        crate::voice::stop_speaking();
        self.att.call = None;
        self.att.call_rx = None;
    }

    pub(super) fn call_state(&self) -> Option<(u64, CallPhase)> {
        self.att.call
    }

    /// Listen → understand → the bot answers → it's read aloud → listen again.
    pub(super) fn call_poll(&mut self, ctx: &egui::Context) {
        let Some((bot_id, phase)) = self.att.call else { return };
        ctx.request_repaint_after(std::time::Duration::from_millis(150));
        match phase {
            CallPhase::Listening => {
                if self.att.call_rec.is_none() {
                    match crate::voice::listen() {
                        Ok(r) => self.att.call_rec = Some(r),
                        Err(e) => {
                            self.att.error = Some(e);
                            self.call_end();
                        }
                    }
                    return;
                }
                if self.att.call_rec.as_mut().map(|r| r.done()).unwrap_or(false) {
                    let rec = self.att.call_rec.take().unwrap();
                    let lang = self.state.bot(bot_id).map(|b| b.voice_lang.clone()).unwrap_or_default();
                    let ps = self.state.provider(ProviderKind::OpenAi);
                    let base = providers::resolve_base(ProviderKind::OpenAi, &ps.base_url);
                    let key = providers::resolve_key(ProviderKind::OpenAi, &ps.api_key);
                    let (tx, rx) = channel();
                    self.att.call_rx = Some(rx);
                    let c = ctx.clone();
                    std::thread::spawn(move || {
                        let r = rec.finish().and_then(|f| {
                            let t = crate::voice::transcribe_lang(&base, &key, &f, &lang);
                            let _ = std::fs::remove_file(&f);
                            t
                        });
                        let _ = tx.send(r);
                        c.request_repaint();
                    });
                    self.att.call = Some((bot_id, CallPhase::Transcribing));
                }
            }
            CallPhase::Transcribing => {
                let Some(rx) = &self.att.call_rx else { return };
                if let Ok(r) = rx.try_recv() {
                    self.att.call_rx = None;
                    match r {
                        Ok(t) if !t.trim().is_empty() => {
                            self.drafts.insert(bot_id, t);
                            self.send(ctx, bot_id);
                            self.att.call = Some((bot_id, CallPhase::Thinking));
                        }
                        // Nothing said: keep listening; a real error ends the call.
                        Err(e) if !e.contains("沒有聽到") => {
                            self.att.error = Some(e);
                            self.call_end();
                        }
                        _ => self.att.call = Some((bot_id, CallPhase::Listening)),
                    }
                }
            }
            CallPhase::Thinking => {
                if !self.streams.contains_key(&bot_id) && !self.approvals.contains_key(&bot_id) {
                    let answer = self.state.bot(bot_id).and_then(|b| b.messages.iter().rev().find(|m| m.role == Role::Assistant && !m.text.trim().is_empty())).map(|m| m.text.clone());
                    // Answers are read here, not by the 朗讀 switch (no double reading).
                    if let Some(a) = answer {
                        let (v, r) = self.state.bot(bot_id).map(|b| (b.voice.clone(), b.voice_rate)).unwrap_or_default();
                        crate::voice::speak_as(&a, &v, if r > 0.0 { r } else { 1.0 });
                    }
                    self.att.call = Some((bot_id, CallPhase::Speaking));
                }
            }
            CallPhase::Speaking => {
                if !crate::voice::speaking() {
                    self.att.call = Some((bot_id, CallPhase::Listening));
                }
            }
        }
    }
}