use std::rc::Rc;

use crate::doc_formatter::{DocumentFormatter, TextFormat};
use crate::text_annotations::{InlineAnnotation, Overlay, TextAnnotations};

impl TextFormat {
    fn new_test(softwrap: bool) -> Self {
        TextFormat {
            soft_wrap: softwrap,
            tab_width: 2,
            max_wrap: 3,
            max_indent_retain: 4,
            wrap_indicator: ".".into(),
            wrap_indicator_highlight: None,
            // use a prime number to allow lining up too often with repeat
            viewport_width: 17,
        }
    }
}

impl<'t> DocumentFormatter<'t> {
    fn collect_to_str(&mut self) -> String {
        use std::fmt::Write;
        let mut res = String::new();
        let viewport_width = self.text_fmt.viewport_width;
        let mut line = 0;

        for (grapheme, pos) in self {
            if pos.row != line {
                line += 1;
                assert_eq!(pos.row, line);
                write!(res, "\n{}", ".".repeat(pos.col)).unwrap();
                assert!(
                    pos.col <= viewport_width as usize,
                    "softwrapped failed {}<={viewport_width}",
                    pos.col
                );
            }
            write!(res, "{}", grapheme.grapheme).unwrap();
        }

        res
    }
}

fn softwrap_text(text: &str) -> String {
    DocumentFormatter::new_at_prev_checkpoint(
        text.into(),
        &TextFormat::new_test(true),
        &TextAnnotations::default(),
        0,
    )
    .0
    .collect_to_str()
}

#[test]
fn basic_softwrap() {
    assert_eq!(
        softwrap_text(&"foo ".repeat(10)),
        "foo foo foo foo \n.foo foo foo foo \n.foo foo  "
    );
    assert_eq!(
        softwrap_text(&"fooo ".repeat(10)),
        "fooo fooo fooo \n.fooo fooo fooo \n.fooo fooo fooo \n.fooo  "
    );

    // check that we don't wrap unnecessarily
    assert_eq!(softwrap_text("\t\txxxx1xxxx2xx\n"), "    xxxx1xxxx2xx \n ");
}

#[test]
fn softwrap_indentation() {
    assert_eq!(
        softwrap_text("\t\tfoo1 foo2 foo3 foo4 foo5 foo6\n"),
        "    foo1 foo2 \n.....foo3 foo4 \n.....foo5 foo6 \n "
    );
    assert_eq!(
        softwrap_text("\t\t\tfoo1 foo2 foo3 foo4 foo5 foo6\n"),
        "      foo1 foo2 \n.foo3 foo4 foo5 \n.foo6 \n "
    );
}

#[test]
fn long_word_softwrap() {
    assert_eq!(
        softwrap_text("\t\txxxx1xxxx2xxxx3xxxx4xxxx5xxxx6xxxx7xxxx8xxxx9xxx\n"),
        "    xxxx1xxxx2xxx\n.....x3xxxx4xxxx5\n.....xxxx6xxxx7xx\n.....xx8xxxx9xxx \n "
    );
    assert_eq!(
        softwrap_text("xxxxxxxx1xxxx2xxx\n"),
        "xxxxxxxx1xxxx2xxx\n. \n "
    );
    assert_eq!(
        softwrap_text("\t\txxxx1xxxx 2xxxx3xxxx4xxxx5xxxx6xxxx7xxxx8xxxx9xxx\n"),
        "    xxxx1xxxx \n.....2xxxx3xxxx4x\n.....xxx5xxxx6xxx\n.....x7xxxx8xxxx9\n.....xxx \n "
    );
    assert_eq!(
        softwrap_text("\t\txxxx1xxx 2xxxx3xxxx4xxxx5xxxx6xxxx7xxxx8xxxx9xxx\n"),
        "    xxxx1xxx 2xxx\n.....x3xxxx4xxxx5\n.....xxxx6xxxx7xx\n.....xx8xxxx9xxx \n "
    );
}

fn overlay_text(text: &str, char_pos: usize, softwrap: bool, overlays: &[Overlay]) -> String {
    DocumentFormatter::new_at_prev_checkpoint(
        text.into(),
        &TextFormat::new_test(softwrap),
        TextAnnotations::default().add_overlay(overlays.into(), None),
        char_pos,
    )
    .0
    .collect_to_str()
}

#[test]
fn overlay() {
    assert_eq!(
        overlay_text(
            "foobar",
            0,
            false,
            &[
                Overlay {
                    char_idx: 0,
                    grapheme: "X".into(),
                },
                Overlay {
                    char_idx: 2,
                    grapheme: "\t".into(),
                },
            ]
        ),
        "Xo  bar "
    );
    assert_eq!(
        overlay_text(
            &"foo ".repeat(10),
            0,
            true,
            &[
                Overlay {
                    char_idx: 2,
                    grapheme: "\t".into(),
                },
                Overlay {
                    char_idx: 5,
                    grapheme: "\t".into(),
                },
                Overlay {
                    char_idx: 16,
                    grapheme: "X".into(),
                },
            ]
        ),
        "fo   f  o foo \n.foo Xoo foo foo \n.foo foo foo  "
    );
}

fn annotate_text(text: &str, softwrap: bool, annotations: &[InlineAnnotation]) -> String {
    DocumentFormatter::new_at_prev_checkpoint(
        text.into(),
        &TextFormat::new_test(softwrap),
        TextAnnotations::default().add_inline_annotations(annotations.into(), None),
        0,
    )
    .0
    .collect_to_str()
}

#[test]
fn annotation() {
    assert_eq!(
        annotate_text(
            "bar",
            false,
            &[InlineAnnotation {
                char_idx: 0,
                text: "foo".into(),
            }]
        ),
        "foobar "
    );
    assert_eq!(
        annotate_text(
            &"foo ".repeat(10),
            true,
            &[InlineAnnotation {
                char_idx: 0,
                text: "foo ".into(),
            }]
        ),
        "foo foo foo foo \n.foo foo foo foo \n.foo foo foo  "
    );
}
#[test]
fn annotation_and_overlay() {
    assert_eq!(
        DocumentFormatter::new_at_prev_checkpoint(
            "bbar".into(),
            &TextFormat::new_test(false),
            TextAnnotations::default()
                .add_inline_annotations(
                    Rc::new([InlineAnnotation {
                        char_idx: 0,
                        text: "fooo".into(),
                    }]),
                    None
                )
                .add_overlay(
                    Rc::new([Overlay {
                        char_idx: 0,
                        grapheme: "\t".into(),
                    }]),
                    None
                ),
            0,
        )
        .0
        .collect_to_str(),
        "fooo  bar "
    );
}