package prog8tests

import com.github.michaelbull.result.Ok
import com.github.michaelbull.result.expectError
import com.github.michaelbull.result.getOrElse
import io.kotest.assertions.withClue
import io.kotest.core.spec.style.FunSpec
import io.kotest.matchers.shouldBe
import prog8.codegen.target.cbm.IsoEncoding
import prog8.codegen.target.cbm.PetsciiEncoding


class TestStringEncodings: FunSpec({

    context("petscii") {
        test("testZero") {
            PetsciiEncoding.encodePetscii("\u0000", true) shouldBe Ok(listOf<UByte>(0u))
            PetsciiEncoding.encodePetscii("\u0000", false) shouldBe Ok(listOf<UByte>(0u))
            PetsciiEncoding.decodePetscii(listOf(0u), true) shouldBe Ok("\u0000")
            PetsciiEncoding.decodePetscii(listOf(0u), false) shouldBe Ok("\u0000")
        }

        test("testLowercase") {
            PetsciiEncoding.encodePetscii("hello WORLD 123 @!£", true) shouldBe
                    Ok(listOf<UByte>(72u, 69u, 76u, 76u, 79u, 32u, 0xd7u, 0xcfu, 0xd2u, 0xccu, 0xc4u, 32u, 49u, 50u, 51u, 32u, 64u, 33u, 0x5cu))
            PetsciiEncoding.encodePetscii("\uf11a", true) shouldBe Ok(listOf<UByte>(0x12u))   // reverse vid
            PetsciiEncoding.encodePetscii("✓", true) shouldBe Ok(listOf<UByte>(0xfau))
            withClue("expect lowercase error fallback") {
                PetsciiEncoding.encodePetscii("π", true) shouldBe Ok(listOf<UByte>(255u))
                PetsciiEncoding.encodePetscii("♥", true) shouldBe Ok(listOf<UByte>(0xd3u))
            }

            PetsciiEncoding.decodePetscii(listOf(72u, 0xd7u, 0x5cu, 0xfau, 0x12u), true) shouldBe Ok("hW£✓\uF11A")
        }

        test("testUppercase") {
            PetsciiEncoding.encodePetscii("HELLO 123 @!£") shouldBe
                    Ok(listOf<UByte>(72u, 69u, 76u, 76u, 79u, 32u, 49u, 50u, 51u, 32u, 64u, 33u, 0x5cu))
            PetsciiEncoding.encodePetscii("\uf11a") shouldBe Ok(listOf<UByte>(0x12u))   // reverse vid
            PetsciiEncoding.encodePetscii("♥") shouldBe Ok(listOf<UByte>(0xd3u))
            PetsciiEncoding.encodePetscii("π") shouldBe Ok(listOf<UByte>(0xffu))
            withClue("expecting fallback") {
                PetsciiEncoding.encodePetscii("✓") shouldBe Ok(listOf<UByte>(250u))
            }

            PetsciiEncoding.decodePetscii(listOf(72u, 0x5cu, 0xd3u, 0xffu)) shouldBe Ok("H£♥π")
        }

        test("testScreencodeLowercase") {
            PetsciiEncoding.encodeScreencode("hello WORLD 123 @!£", true) shouldBe
                    Ok(listOf<UByte>(0x08u, 0x05u, 0x0cu, 0x0cu, 0x0fu, 0x20u, 0x57u, 0x4fu, 0x52u, 0x4cu, 0x44u, 0x20u, 0x31u, 0x32u, 0x33u, 0x20u, 0x00u, 0x21u, 0x1cu))
            PetsciiEncoding.encodeScreencode("✓", true) shouldBe Ok(listOf<UByte>(0x7au))
            withClue("expect fallback") {
                PetsciiEncoding.encodeScreencode("♥", true) shouldBe Ok(listOf<UByte>(83u))
                PetsciiEncoding.encodeScreencode("π", true) shouldBe Ok(listOf<UByte>(94u))
            }

            PetsciiEncoding.decodeScreencode(listOf(0x08u, 0x57u, 0x1cu, 0x7au), true) shouldBe Ok("hW£✓")
        }

        test("testScreencodeUppercase") {
            PetsciiEncoding.encodeScreencode("WORLD 123 @!£") shouldBe
                    Ok(listOf<UByte>(0x17u, 0x0fu, 0x12u, 0x0cu, 0x04u, 0x20u, 0x31u, 0x32u, 0x33u, 0x20u, 0x00u, 0x21u, 0x1cu))
            PetsciiEncoding.encodeScreencode("♥") shouldBe Ok(listOf<UByte>(0x53u))
            PetsciiEncoding.encodeScreencode("π") shouldBe Ok(listOf<UByte>(0x5eu))
            PetsciiEncoding.encodeScreencode("HELLO") shouldBe Ok(listOf<UByte>(8u, 5u, 12u, 12u, 15u))
            withClue("expecting fallback") {
                PetsciiEncoding.encodeScreencode("hello") shouldBe Ok(listOf<UByte>(8u, 5u, 12u, 12u, 15u))
                PetsciiEncoding.encodeScreencode("✓") shouldBe Ok(listOf<UByte>(122u))
            }

            PetsciiEncoding.decodeScreencode(listOf(0x17u, 0x1cu, 0x53u, 0x5eu)) shouldBe Ok("W£♥π")
        }

        test("testErrorCases") {
            PetsciiEncoding.encodePetscii("~", true).expectError { "shouldn't be able to encode tilde" }
            PetsciiEncoding.encodePetscii("~", false).expectError { "shouldn't be able to encode tilde" }
            PetsciiEncoding.encodeScreencode("~", true).expectError { "shouldn't be able to encode tilde" }
            PetsciiEncoding.encodeScreencode("~", false).expectError { "shouldn't be able to encode tilde" }
        }

        test("testSpecialReplacements") {
            fun encodeP(c: Char, lower: Boolean) = PetsciiEncoding.encodePetscii(c.toString(), lower).getOrElse { throw it }.single()
            fun encodeS(c: Char, lower: Boolean) = PetsciiEncoding.encodeScreencode(c.toString(), lower).getOrElse { throw it }.single()

            PetsciiEncoding.encodePetscii("`", false).expectError { "shouldn't have translation for backtick" }
            PetsciiEncoding.encodePetscii("`", true).expectError { "shouldn't have translation for backtick" }
            PetsciiEncoding.encodePetscii("~", false).expectError { "shouldn't have translation for tilde" }
            PetsciiEncoding.encodePetscii("~", true).expectError { "shouldn't have translation for tilde" }

            encodeP('^', false) shouldBe 94u
            encodeP('^', true) shouldBe 94u
            encodeS('^', false) shouldBe 30u
            encodeS('^', true) shouldBe 30u
            encodeP('_', false) shouldBe 228u
            encodeP('_', true) shouldBe 228u
            encodeS('_', false) shouldBe 100u
            encodeS('_', true) shouldBe 100u
            encodeP('{', false) shouldBe 243u
            encodeP('{', true) shouldBe 243u
            encodeS('{', false) shouldBe 115u
            encodeS('{', true) shouldBe 115u
            encodeP('}', false) shouldBe 235u
            encodeP('}', true) shouldBe 235u
            encodeS('}', false) shouldBe 107u
            encodeS('}', true) shouldBe 107u
            encodeP('|', false) shouldBe 221u
            encodeP('|', true) shouldBe 221u
            encodeS('|', false) shouldBe 93u
            encodeS('|', true) shouldBe 93u
            encodeP('\\', false) shouldBe 205u
            encodeP('\\', true) shouldBe 205u
            encodeS('\\', false) shouldBe 77u
            encodeS('\\', true) shouldBe 77u
        }

        test("testBoxDrawingCharsEncoding") {
            fun encodeP(c: Char, lower: Boolean) = PetsciiEncoding.encodePetscii(c.toString(), lower).getOrElse { throw it }.single()
            fun encodeS(c: Char, lower: Boolean) = PetsciiEncoding.encodeScreencode(c.toString(), lower).getOrElse { throw it }.single()

            // pipe char
            encodeP('|', false) shouldBe 221u
            encodeP('|', true) shouldBe 221u
            encodeS('|', false) shouldBe 93u
            encodeS('|', true) shouldBe 93u
            // ... same as '│', 0x7D -> BOX DRAWINGS LIGHT VERTICAL
            encodeP('│', false) shouldBe 221u
            encodeP('│', true) shouldBe 221u
            encodeS('│', false) shouldBe 93u
            encodeS('│', true) shouldBe 93u

            // underscore
            encodeP('_', false) shouldBe 228u
            encodeP('_', true) shouldBe 228u
            encodeS('_', false) shouldBe 100u
            encodeS('_', true) shouldBe 100u
            // ... same as '▁',  0xE4 LOWER ONE EIGHTH BLOCK
            encodeP('▁', false) shouldBe 228u
            encodeP('▁', true) shouldBe 228u
            encodeS('▁', false) shouldBe 100u
            encodeS('▁', true) shouldBe 100u

            // ─    0xC0 -> BOX DRAWINGS LIGHT HORIZONTAL
            encodeP('─', false) shouldBe 192u
            encodeP('─', true) shouldBe 192u
            encodeS('─', false) shouldBe 64u
            encodeS('─', true) shouldBe 64u
            // │    0x62 -> BOX DRAWINGS LIGHT VERTICAL
            encodeP('│', false) shouldBe 221u
            encodeP('│', true) shouldBe 221u
            encodeS('│', false) shouldBe 93u
            encodeS('│', true) shouldBe 93u
        }

        test("testBoxDrawingCharsDecoding") {
            // ─    0xC0 -> BOX DRAWINGS LIGHT HORIZONTAL
            PetsciiEncoding.decodePetscii(listOf(195u), false).getOrElse { throw it }.single() shouldBe '\uf13b' //"BOX DRAWINGS LIGHT HORIZONTAL ONE EIGHTH UP (CUS)"
            PetsciiEncoding.decodePetscii(listOf(195u), true).getOrElse { throw it }.single() shouldBe 'C'
            PetsciiEncoding.decodePetscii(listOf(192u), false).getOrElse { throw it }.single() shouldBe '─'
            PetsciiEncoding.decodePetscii(listOf(192u), true).getOrElse { throw it }.single() shouldBe '─'
            PetsciiEncoding.decodeScreencode(listOf(67u), false).getOrElse { throw it }.single() shouldBe '\uf13b' //"BOX DRAWINGS LIGHT HORIZONTAL ONE EIGHTH UP (CUS)"
            PetsciiEncoding.decodeScreencode(listOf(67u), true).getOrElse { throw it }.single() shouldBe 'C'
            PetsciiEncoding.decodeScreencode(listOf(64u), false).getOrElse { throw it }.single() shouldBe '─'
            PetsciiEncoding.decodeScreencode(listOf(64u), true).getOrElse { throw it }.single() shouldBe '─'

            // │    0x62 -> BOX DRAWINGS LIGHT VERTICAL
            PetsciiEncoding.decodePetscii(listOf(125u), false).getOrElse { throw it }.single() shouldBe '│'
            PetsciiEncoding.decodePetscii(listOf(125u), true).getOrElse { throw it }.single() shouldBe '│'
            PetsciiEncoding.decodePetscii(listOf(221u), false).getOrElse { throw it }.single() shouldBe '│'
            PetsciiEncoding.decodePetscii(listOf(221u), true).getOrElse { throw it }.single() shouldBe '│'
            PetsciiEncoding.decodeScreencode(listOf(93u), false).getOrElse { throw it }.single() shouldBe '│'
            PetsciiEncoding.decodeScreencode(listOf(93u), true).getOrElse { throw it }.single() shouldBe '│'
            PetsciiEncoding.decodeScreencode(listOf(66u), false).getOrElse { throw it }.single() shouldBe '\uf13c' // "BOX DRAWINGS LIGHT VERTICAL ONE EIGHTH LEFT (CUS)"
            PetsciiEncoding.decodeScreencode(listOf(66u), true).getOrElse { throw it }.single() shouldBe 'B'
        }
    }

    context("iso") {
        test("iso accepts iso-characters") {
            val result = IsoEncoding.encode("a_~ëç")
            result.getOrElse { throw it }.map {it.toInt()} shouldBe listOf(97, 95, 126, 235, 231)
        }

        test("non-iso doesn't accept iso-characters") {
            var result = PetsciiEncoding.encodePetscii("a_~ë")
            result.expectError { "should not encode" }
            result = PetsciiEncoding.encodeScreencode("a_~ë")
            result.expectError { "should not encode" }
        }
    }
})