use crate::{model::{misc::Game, profile::{Display, DisplayMode}}, util::bool_to_01};
use anyhow::Result;
use displayz::{query_displays, DisplaySet};
use ini::Ini;
use tauri::{AppHandle, Listener};

#[derive(Clone)]
pub struct DisplayInfo {
    pub primary: Option<String>,
    pub set: Option<DisplaySet>,
}

impl Default for DisplayInfo {
    fn default() -> Self {
        DisplayInfo {
            primary: None,
            set: query_displays().ok(),
        }
    }
}

impl Display {
    pub fn wait_for_exit(app: AppHandle, info: DisplayInfo) {
        log::debug!("display: waiting");
        tauri::async_runtime::spawn(async move {
            app.listen("launch-end", move |_| {
                if let Err(e) = Self::clean_up(&info) {
                    log::error!("error cleaning up display: {:?}", e);
                }
            });
        });
    }

    pub fn prepare(&self) -> Result<Option<DisplayInfo>> {
        use anyhow::anyhow;
        use displayz::{query_displays, Orientation, Resolution, Frequency};

        if self.target == "default" {
            log::debug!("prepare display: skip");
            return Ok(None);
        }

        let display_set = query_displays()?;

        let primary = display_set
            .displays()
            .find(|display| display.is_primary())
            .ok_or_else(|| anyhow!("Primary display not found"))?;

        let target = display_set
            .displays()
            .find(|display| display.name() == self.target)
            .ok_or_else(|| anyhow!("Display {} not found", self.target))?;

        if !self.dont_switch_primary {
            target.set_primary()?;
        }
        let settings = target.settings()
            .as_ref()
            .ok_or_else(|| anyhow!("Unable to query display settings"))?;

        let res = DisplayInfo {
            primary: if self.dont_switch_primary { None } else { Some(primary.name().to_owned()) },
            set: Some(display_set.clone()),
        };

        if let Some(rotation) = self.rotation {
            let rez = settings.borrow_mut().resolution;
            settings.borrow_mut().orientation = match rotation {
                0 => Orientation::Landscape,
                90 => Orientation::PortraitFlipped,
                180 => Orientation::LandscapeFlipped,
                270 => Orientation::Portrait,
                _ => panic!("Invalid display rotation")
            };
            if rez.height < rez.width {
                if rotation == 90 || rotation == 270 {
                    settings.borrow_mut().resolution = Resolution::new(rez.height, rez.width);
                }
            } else {
                if rotation == 0 || rotation == 180 {
                    settings.borrow_mut().resolution = Resolution::new(rez.height, rez.width);
                }
            }
        }

        let frequency: u32 = self.frequency
            .try_into()
            .map_err(|e| anyhow!("Invalid display frequency: {}", e))?;

        let width: u32 = self.rez.0
            .try_into()
            .map_err(|e| anyhow!("Invalid display width: {}", e))?;

        let height: u32 = self.rez.1
            .try_into()
            .map_err(|e| anyhow!("Invalid display height: {}", e))?;

        settings.borrow_mut().frequency = Frequency::new(frequency);

        if self.borderless_fullscreen && self.mode == DisplayMode::Borderless {
            settings.borrow_mut().resolution = Resolution::new(width, height);
        }

        display_set.apply().map_err(
            |_| anyhow!("The selected monitor has been disconnected or doesn't support the chosen display mode")
        )?;
        displayz::refresh()?;

        log::debug!("prepare display: done");

        Ok(Some(res))
    }

    pub fn line_up(&self, game: Game, ini: &mut Ini) {
        if game == Game::Chunithm {
            let autism = self.monitor_index_override.unwrap_or(0).to_string();
            ini.with_section(Some("gfx"))
                .set("enable", "1")
                .set("windowed", bool_to_01(self.mode != DisplayMode::Fullscreen))
                .set("framed", bool_to_01(self.mode == DisplayMode::Window))
                .set("monitor", if self.dont_switch_primary { &autism } else { "0" });
            ini.with_section(Some("system"))
                .set("dipsw2", bool_to_01(self.frequency == 60))
                .set("dipsw3", bool_to_01(self.frequency == 60));
        }
    }

    pub fn clean_up(info: &DisplayInfo) -> Result<()> {
        use anyhow::anyhow;

        let display_set = info.set.as_ref()
            .ok_or_else(|| anyhow!("Unable to clean up displays: no display set"))?;

        if let Some(info_primary) = &info.primary {
            let primary = display_set
                .displays()
                .find(|display| display.name() == info_primary)
                .ok_or_else(|| anyhow!("Display {} not found", info_primary))?;

            primary.set_primary()?;
        }

        display_set.apply()?;
        displayz::refresh()?;

        log::debug!("undo display: done");

        Ok(())
    }
}