use std::{fs::File, io::Write};

use anyhow::Context;
use docx_rs::{Docx, Paragraph, Run, RunFonts, Table, TableCell, TableRow};

use crate::{
    config::UserConfig,
    schedule::MonthlySchedule,
    slot::{month_to_greek, weekday_to_greek, Day, ShiftPosition, Slot},
    workload::WorkloadTracker,
};

#[derive(Debug)]
pub enum FileType {
    Txt,
    Docx,
}

pub trait Export {
    fn export(
        &self,
        file_type: FileType,
        config: &UserConfig,
        tracker: &WorkloadTracker,
    ) -> anyhow::Result<()>;
}

impl Export for MonthlySchedule {
    fn export(
        &self,
        file_type: FileType,
        config: &UserConfig,
        tracker: &WorkloadTracker,
    ) -> anyhow::Result<()> {
        match file_type {
            FileType::Txt => self.export_as_txt(config, tracker)?,
            FileType::Docx => self.export_as_doc(config)?,
        };

        Ok(())
    }
}

impl MonthlySchedule {
    pub fn export_as_txt(
        &self,
        config: &UserConfig,
        tracker: &WorkloadTracker,
    ) -> anyhow::Result<()> {
        let file = File::create("rota.txt")?;
        let mut writer = std::io::BufWriter::new(file);

        writer.write_all(self.pretty_print(config).as_bytes())?;

        writer.write_all(self.report(config, tracker).as_bytes())?;

        writer.flush()?;

        Ok(())
    }

    pub fn export_as_doc(&self, config: &UserConfig) -> anyhow::Result<()> {
        let path = std::path::Path::new("rota.docx");
        let file = std::fs::File::create(path)?;

        let header = Table::new(vec![
            TableRow::new(vec![TableCell::new().add_paragraph(
                Paragraph::new()
                    .add_run(Run::new().bold().add_text("Εφημερίες Ακτινολογικό"))
                    .fonts(RunFonts::new().ascii("Arial")),
            )]),
            TableRow::new(vec![TableCell::new().add_paragraph(
                Paragraph::new()
                    .add_run(Run::new().bold().add_text(format!(
                        "Μήνας {} {}",
                        month_to_greek(config.month.number_from_month()),
                        config.year
                    )))
                    .fonts(RunFonts::new().ascii("Arial")),
            )]),
            TableRow::new(vec![TableCell::new().add_paragraph(
                Paragraph::new()
                    .add_run(Run::new().bold().add_text(""))
                    .fonts(RunFonts::new().ascii("Arial")),
            )]),
            TableRow::new(vec![TableCell::new().add_paragraph(
                Paragraph::new()
                    .add_run(
                        Run::new()
                            .bold()
                            .add_text("ΠΑΝΕΠΙΣΤΗΜΙΑΚΟ ΓΕΝΙΚΟ ΝΟΣΟΚΟΜΕΙΟ ΙΩΑΝΝΙΝΩΝ"),
                    )
                    .fonts(RunFonts::new().ascii("Arial")),
            )]),
        ]);

        let mut doc = Docx::new().add_table(header);

        let mut residents_table = Table::new(vec![]);

        for d in 1..=config.total_days {
            let day = Day(d);
            let is_weekend = day.is_weekend(config.month.number_from_month(), config.year);
            let slot_first = Slot::new(Day(d), ShiftPosition::First);
            let slot_first_res_id = self.get_resident_id(&slot_first);
            let res_name_1 = config
                .residents
                .iter()
                .find(|r| Some(&r.id) == slot_first_res_id)
                .map(|r| r.name.as_str())
                .unwrap_or("-");

            let res_name_2 = if day.is_open_shift() {
                let slot_second = Slot::new(Day(d), ShiftPosition::Second);
                let slot_second_res_id = self.get_resident_id(&slot_second);
                config
                    .residents
                    .iter()
                    .find(|r| Some(&r.id) == slot_second_res_id)
                    .map(|r| r.name.as_str())
            } else {
                None
            };

            let make_run = |text: &str| {
                let mut run = Run::new().add_text(text);
                if is_weekend {
                    run = run.bold();
                }
                run
            };

            let residents_table_row = TableRow::new(vec![
                TableCell::new().add_paragraph(
                    Paragraph::new()
                        .add_run(make_run(&format!("{d}")))
                        .fonts(RunFonts::new().ascii("Arial")),
                ),
                TableCell::new().add_paragraph(
                    Paragraph::new()
                        .add_run(make_run(weekday_to_greek(
                            Day(d).weekday(config.month.number_from_month(), config.year),
                        )))
                        .fonts(RunFonts::new().ascii("Arial")),
                ),
                TableCell::new().add_paragraph(
                    Paragraph::new()
                        .add_run(make_run(res_name_1))
                        .fonts(RunFonts::new().ascii("Arial")),
                ),
                TableCell::new().add_paragraph(
                    Paragraph::new()
                        .add_run(make_run(res_name_2.unwrap_or("")))
                        .fonts(RunFonts::new().ascii("Arial")),
                ),
            ]);

            residents_table = residents_table.add_row(residents_table_row);
        }

        doc = doc.add_table(residents_table);

        doc.build().pack(file)?;

        tauri_plugin_opener::open_path(path, None::<&str>)
            .context("Created file but failed to open it")?;

        Ok(())
    }
}

#[cfg(test)]
mod tests {
    use anyhow::Ok;
    use rstest::{fixture, rstest};

    use crate::{
        config::UserConfig,
        export::{Export, FileType},
        resident::Resident,
        schedule::MonthlySchedule,
        scheduler::Scheduler,
        workload::{WorkloadBounds, WorkloadTracker},
    };

    #[fixture]
    fn schedule() -> MonthlySchedule {
        MonthlySchedule::new()
    }

    #[fixture]
    fn config() -> UserConfig {
        UserConfig::default().with_residents(vec![
            Resident::new(1, "Στέφανος"),
            Resident::new(2, "Ιορδάνης"),
            Resident::new(3, "Μαρία"),
            Resident::new(4, "Βεατρίκη"),
            Resident::new(5, "Τάκης"),
            Resident::new(6, "Μάκης"),
        ])
    }

    #[fixture]
    fn bounds(config: UserConfig) -> WorkloadBounds {
        WorkloadBounds::new_with_config(&config)
    }

    #[fixture]
    fn scheduler(config: UserConfig, bounds: WorkloadBounds) -> Scheduler {
        Scheduler::new(config, bounds)
    }

    #[fixture]
    fn tracker() -> WorkloadTracker {
        WorkloadTracker::default()
    }

    #[rstest]
    pub fn test_export_as_txt(
        mut schedule: MonthlySchedule,
        mut tracker: WorkloadTracker,
        scheduler: Scheduler,
    ) -> anyhow::Result<()> {
        assert!(scheduler.run(&mut schedule, &mut tracker)?);

        schedule.export(FileType::Txt, &scheduler.config, &tracker)?;

        Ok(())
    }

    #[rstest]
    pub fn test_export_as_doc(
        mut schedule: MonthlySchedule,
        mut tracker: WorkloadTracker,
        scheduler: Scheduler,
    ) -> anyhow::Result<()> {
        assert!(scheduler.run(&mut schedule, &mut tracker)?);

        schedule.export(FileType::Docx, &scheduler.config, &tracker)?;

        Ok(())
    }
}