//
//  GeminiFormatTests.swift
//  GeminiFormatTests
//
//  Created by Shadowfacts on 7/12/20.
//

import XCTest
@testable import GeminiFormat

class GeminiFormatTests: XCTestCase {
    
    func assertParseLines(text: String, lines expected: [Document.Line], message: String, file: StaticString = #filePath, line: UInt = #line) {
        let doc = GeminiParser.parse(text: text, baseURL: URL(string: "gemini://example.com")!)
        XCTAssertEqual(doc.lines, expected, message, file: file, line: line)
    }

    func testParsePlainLines() {
        assertParseLines(text: "test", lines: [.text("test")], message: "parse a plain text line")
        assertParseLines(text: "one\ntwo", lines: [
                            .text("one"),
                            .text("two")
        ], message: "parse multiple, newline delmited plain lines")
        assertParseLines(text: "one\r\ntwo", lines: [
                            .text("one"),
                            .text("two")
        ], message: "parse multiple, CRLF delmited plain lines")
    }
    
    func testParseLinkLines() {
        assertParseLines(text: "=> gemini://blah.com", lines: [
            .link(URL(string: "gemini://blah.com")!, text: nil)
        ], message: "parse a bare link line")
        assertParseLines(text: "=> gemini://blah.com:1234/foo/bar?baz", lines: [
            .link(URL(string: "gemini://blah.com:1234/foo/bar?baz")!, text: nil)
        ], message: "parse a more complex bare link line")
        assertParseLines(text: "=> gemini://blah.com \t Link to example", lines: [
            .link(URL(string: "gemini://blah.com")!, text: "Link to example")
        ], message: "parse a simple link line with associated text")
        assertParseLines(text: "=> gemini://blah.com/foo   Link to foo", lines: [
            .link(URL(string: "gemini://blah.com/foo")!, text: "Link to foo")
        ], message: "parse a more complex link line with associated text")
        assertParseLines(text: "=> https://example.com", lines: [
            .link(URL(string: "https://example.com")!, text: nil)
        ], message: "parse a link with a different protocol")
        assertParseLines(text: "=> /foo/bar/baz", lines: [
            .link(URL(string: "gemini://example.com/foo/bar/baz")!, text: nil)
        ], message: "resolve a relative path link")
        assertParseLines(text: "=>gemini://blah.com", lines: [
            .link(URL(string: "gemini://blah.com")!, text: nil)
        ], message: "parse link without whitespace after =>")
    }
    
    func testParseHeadingLines() {
        assertParseLines(text: "# test", lines: [
            .heading("test", level: .h1)
        ], message: "level 1 heading")
        assertParseLines(text: "#test", lines: [
            .heading("test", level: .h1)
        ], message: "level 1 heading without whitespace")
        assertParseLines(text: "#test\n## two\r\n###three", lines: [
            .heading("test", level: .h1),
            .heading("two", level: .h2),
            .heading("three", level: .h3)
        ], message: "multiples headings with and without whitespace")
    }
    
    func testParseListItemLines() {
        assertParseLines(text: "* test list item", lines: [
            .unorderedListItem("test list item")
        ], message: "parse simple list item")
        assertParseLines(text: "*test", lines: [
            .text("*test")
        ], message: "don't parse list item without space after asterisk")
        assertParseLines(text: "* one\n* two\n*three", lines: [
            .unorderedListItem("one"),
            .unorderedListItem("two"),
            .text("*three")
        ], message: "parse multiple list items")
    }
    
    func testParseQuoteLines() {
        assertParseLines(text: "> quote", lines: [
            .quote("quote")
        ], message: "parse quote line")
        assertParseLines(text: ">quote", lines: [
            .quote("quote")
        ], message: "parse quote line without space after >")
        assertParseLines(text: ">one\n> two\n>three", lines: [
            .quote("one"),
            .quote("two"),
            .quote("three")
        ], message: "parse multiple quote lines")
    }
    
    func testParsePreformattedLines() {
        assertParseLines(text: "```\nsomething\n```", lines: [
            .preformattedText("something", alt: nil)
        ], message: "parse simple preformatted line")
        assertParseLines(text: "```alt\nsomething\n```", lines: [
            .preformattedText("something", alt: "alt")
        ], message: "parse simple preformatted line with alt")
        assertParseLines(text: "```alt\nsomething\n```other", lines: [
            .preformattedText("something", alt: "alt")
        ], message: "ignore extra text after closing ```")
        assertParseLines(text: "```\n# not a heading\n* not a list item\n>not a quote\n=> /link not a link\n```", lines: [
            .preformattedText("# not a heading", alt: nil),
            .preformattedText("* not a list item", alt: nil),
            .preformattedText(">not a quote", alt: nil),
            .preformattedText("=> /link not a link", alt: nil),
        ], message: "don't parse special lines inside preformatted")
    }
    
}