package goqr

import (
	"encoding/base64"
	"errors"
	"fmt"
	"reflect"
	"unicode/utf16"
)

// MakeSegmentsOptimally takes a string and error correction level, and attempts to
// make QR segments in the most efficient way possible. It validates the version
// range and converts the input text into code points. Then, it loops through
// each version, attempting to make segments until the data fits within the
// capacity of the version. Returns an array of pointers to QrSegment or an error.
func MakeSegmentsOptimally(text string, ecl Ecc, minVersion, maxVersion int) ([]*QrSegment, error) {
	if !isValidVersion(minVersion, maxVersion) {
		return nil, errors.New("invalid value")
	}

	codePoints, err := toCodePoints(text)
	if err != nil {
		return nil, err
	}

	for version := minVersion; ; version++ {
		if version == minVersion || version == 10 || version == 27 {
			segs, err := makeSegmentsOptimallyWithVersion(codePoints, version)
			if err != nil {
				return nil, err
			}

			dataCapacityBits := getNumDataCodewords(version, ecl) * 8
			dataUsedBits := getTotalBits(segs, version)
			if dataUsedBits != -1 && dataUsedBits <= dataCapacityBits {
				return segs, nil
			}
			if version >= maxVersion {
				msg := "segment too long"
				if dataUsedBits != -1 {
					msg = fmt.Sprintf("data length = %d bits, max capacity = %d bits", dataUsedBits, dataCapacityBits)
				}
				return nil, &DataTooLongException{Msg: msg}
			}
		}
	}
}

// makeSegmentsOptimallyWithVersion takes code points and a version number,
// computes the character modes suitable for that version, and then splits the
// code points into segments accordingly. Returns an array of pointers to
// QrSegment or an error.
func makeSegmentsOptimallyWithVersion(codePoints []int, version int) ([]*QrSegment, error) {
	charModes, err := computeCharacterModes(codePoints, version)
	if err != nil {
		return nil, err
	}
	return splitIntoSegments(codePoints, charModes)
}

// toCodePoints returns a new slice of Unicode code points (effectively
// UTF-32 / UCS-4) representing the given UTF-16 string.
func toCodePoints(s string) ([]int, error) {
	runes := []rune(s)
	codePoints := make([]int, len(runes))
	for i, r := range runes {
		if utf16.IsSurrogate(r) {
			return nil, errors.New("invalid UTF-16 string")
		}
		codePoints[i] = int(r)
	}

	return codePoints, nil
}

// countUtf8Bytes counts the number of bytes required to represent a Unicode code point in UTF-8.
func countUtf8Bytes(cp int) (int, error) {
	if cp < 0 {
		return 0, errors.New("invalid code point")
	} else if cp < 0x80 {
		return 1, nil
	} else if cp < 0x800 {
		return 2, nil
	} else if cp < 0x10000 {
		return 3, nil
	} else if cp < 0x110000 {
		return 4, nil
	} else {
		return 0, errors.New("invalid code point")
	}
}

// computeCharacterModes determines the optimal encoding mode for each character in the input string.
func computeCharacterModes(codePoints []int, version int) ([]Mode, error) {
	if len(codePoints) > 7089 {
		return nil, errors.New("string too long")
	}
	modeTypes := []Mode{Byte, Alphanumeric, Numeric, Kanji}
	numModes := len(modeTypes)

	headCosts := make([]int, numModes)
	charModes := make([][]Mode, len(codePoints))
	for i := 0; i < numModes; i++ {
		headCosts[i] = (4 + modeTypes[i].numCharCountBits(version)) * 6
	}

	for i := range charModes {
		charModes[i] = make([]Mode, numModes)
	}

	prevCosts := make([]int, numModes)
	copy(prevCosts, headCosts)

	// Determine the mode type for each character based on cost calculation
	for i := 0; i < len(codePoints); i++ {
		c := codePoints[i]
		curCosts := make([]int, numModes)
		{
			count, err := countUtf8Bytes(c)
			if err != nil {
				return nil, err
			}
			curCosts[0] = prevCosts[0] + count*8*6
			charModes[i][0] = modeTypes[0]
		}

		if isAlphanumeric(string(rune(c))) {
			curCosts[1] = prevCosts[1] + 33
			charModes[i][1] = modeTypes[1]
		}

		if isNumeric(string(rune(c))) {
			curCosts[2] = prevCosts[2] + 20
			charModes[i][2] = modeTypes[2]
		}

		if isKanji(c) {
			curCosts[3] = prevCosts[3] + 78
			charModes[i][3] = modeTypes[3]
		}

		for j := 0; j < numModes; j++ {
			for k := 0; k < numModes; k++ {
				newCost := (curCosts[k]+5)/6*6 + headCosts[j]
				if charModes[i][k].getModeBits() != 0 && (charModes[i][j].getModeBits() == 0 || newCost < curCosts[j]) {
					curCosts[j] = newCost
					charModes[i][j] = modeTypes[k]
				}
			}
		}

		prevCosts = curCosts
	}

	curMode := Mode{}
	for i, minCost := 0, 0; i < numModes; i++ {
		if curMode.getModeBits() == 0 || prevCosts[i] < minCost {
			minCost = prevCosts[i]
			curMode = modeTypes[i]
		}
	}

	res := make([]Mode, len(charModes))
	for i := len(res) - 1; i >= 0; i-- {
		for j := 0; j < numModes; j++ {
			if reflect.DeepEqual(modeTypes[j], curMode) {
				curMode = charModes[i][j]
				res[i] = curMode
				break
			}
		}
	}
	return res, nil
}

// splitIntoSegments is used to splits the input into multiple QR segments according to the given modes.
// Each change in mode results in a new segment being created.
func splitIntoSegments(codePoints []int, charModes []Mode) ([]*QrSegment, error) {
	res := make([]*QrSegment, 0)
	curMode := charModes[0]
	start := 0
	for i := 1; ; i++ {
		if i < len(codePoints) && reflect.DeepEqual(charModes[i], curMode) {
			continue
		}

		runes := make([]rune, i-start)
		for j, cp := range codePoints[start:i] {
			runes[j] = rune(cp)
		}

		s := string(runes)

		// Create a QR segment based on the current mode
		if curMode.isByte() {
			qs, err := MakeBytes([]byte(s))
			if err != nil {
				return nil, err
			}
			res = append(res, qs)
		} else if curMode.isNumeric() {
			qs, err := MakeNumeric(s)
			if err != nil {
				return nil, err
			}
			res = append(res, qs)
		} else if curMode.isAlphanumeric() {
			qs, err := MakeAlphanumeric(s)
			if err != nil {
				return nil, err
			}
			res = append(res, qs)
		} else if curMode.isKanji() {
			qs, err := MakeKanji(s)
			if err != nil {
				return nil, err
			}
			res = append(res, qs)
		} else {
			return nil, errors.New("invalid mode")
		}
		if i >= len(codePoints) {
			return res, nil
		}
		curMode = charModes[i]
		start = i
	}
}

// MakeKanji converts a string into a QR code segment in Kanji mode
// It returns an error if the string contains non-kanji characters.
func MakeKanji(text string) (*QrSegment, error) {
	bb := &BitBuffer{}
	runes := []rune(text)
	for _, c := range text {
		if !isKanji(int(c)) {
			return nil, errors.New("string contains non-kanji-mode characters")
		}
		val := unicdeToQRKanji[c]
		err := bb.appendBits(val, 13)
		if err != nil {
			return nil, err
		}
	}
	return newQrSegment(Kanji, len(runes), bb)
}

// isKanji function takes a integer as input and returns a boolean indicating whether the integer is Kanji.
func isKanji(c int) bool {
	return c < len(unicdeToQRKanji) && unicdeToQRKanji[c] != -1 && c >= 0
}

const packedQRKanjiToUnicode = "MAAwATAC/wz/DjD7/xr/G/8f/wEwmzCcALT/QACo/z7/4/8/MP0w/jCdMJ4wA07dMAUwBjAHMPwgFSAQ/w8AXDAcIBb/XCAmICUgGCAZIBwgHf8I/wkwFDAV/zv/Pf9b/10wCDAJMAowCzAMMA0wDjAPMBAwEf8LIhIAsQDX//8A9/8dImD/HP8eImYiZyIeIjQmQiZA" +
	"ALAgMiAzIQP/5f8EAKIAo/8F/wP/Bv8K/yAApyYGJgUlyyXPJc4lxyXGJaEloCWzJbIlvSW8IDswEiGSIZAhkSGTMBP/////////////////////////////IggiCyKGIocigiKDIioiKf////////////////////8iJyIoAKwh0iHUIgAiA///////////////////" +
	"//////////8iICKlIxIiAiIHImEiUiJqImsiGiI9Ih0iNSIrIiz//////////////////yErIDAmbyZtJmogICAhALb//////////yXv/////////////////////////////////////////////////xD/Ef8S/xP/FP8V/xb/F/8Y/xn///////////////////8h" +
	"/yL/I/8k/yX/Jv8n/yj/Kf8q/yv/LP8t/y7/L/8w/zH/Mv8z/zT/Nf82/zf/OP85/zr///////////////////9B/0L/Q/9E/0X/Rv9H/0j/Sf9K/0v/TP9N/07/T/9Q/1H/Uv9T/1T/Vf9W/1f/WP9Z/1r//////////zBBMEIwQzBEMEUwRjBHMEgwSTBKMEswTDBN" +
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	"////////////////////////MKEwojCjMKQwpTCmMKcwqDCpMKowqzCsMK0wrjCvMLAwsTCyMLMwtDC1MLYwtzC4MLkwujC7MLwwvTC+ML8wwDDBMMIwwzDEMMUwxjDHMMgwyTDKMMswzDDNMM4wzzDQMNEw0jDTMNQw1TDWMNcw2DDZMNow2zDcMN0w3jDf//8w4DDh" +
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	"A78DwAPBA8MDxAPFA8YDxwPIA8n/////////////////////////////////////////////////////////////////////////////////////////////////////////////BBAEEQQSBBMEFAQVBAEEFgQXBBgEGQQaBBsEHAQdBB4EHwQgBCEEIgQjBCQEJQQm" +
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	"////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////" +
	"////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////" +
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	"////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////" +
	"////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////" +
	"////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////" +
	"////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////" +
	"////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////" +
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	"jcuN6o3rjd+N4438jgiOCY3/jh2OHo4Qjh+OQo41jjCONI5K////////jkeOSY5MjlCOSI5ZjmSOYI4qjmOOVY52jnKOfI6BjoeOhY6EjouOio6TjpGOlI6ZjqqOoY6sjrCOxo6xjr6OxY7IjsuO247jjvyO+47rjv6PCo8FjxWPEo8ZjxOPHI8fjxuPDI8mjzOPO485" +
	"j0WPQo8+j0yPSY9Gj06PV49c//+PYo9jj2SPnI+fj6OPrY+vj7eP2o/lj+KP6o/vkIeP9JAFj/mP+pARkBWQIZANkB6QFpALkCeQNpA1kDmP+JBPkFCQUZBSkA6QSZA+kFaQWJBekGiQb5B2lqiQcpCCkH2QgZCAkIqQiZCPkKiQr5CxkLWQ4pDkYkiQ25ECkRKRGZEy" +
	"kTCRSpFWkViRY5FlkWmRc5FykYuRiZGCkaKRq5GvkaqRtZG0kbqRwJHBkcmRy5HQkdaR35HhkduR/JH1kfaSHpH/khSSLJIVkhGSXpJXkkWSSZJkkkiSlZI/kkuSUJKckpaSk5KbklqSz5K5kreS6ZMPkvqTRJMu////////kxmTIpMakyOTOpM1kzuTXJNgk3yTbpNW" +
	"k7CTrJOtk5STuZPWk9eT6JPlk9iTw5Pdk9CTyJPklBqUFJQTlAOUB5QQlDaUK5Q1lCGUOpRBlFKURJRblGCUYpRelGqSKZRwlHWUd5R9lFqUfJR+lIGUf5WClYeVipWUlZaVmJWZ//+VoJWolaeVrZW8lbuVuZW+lcpv9pXDlc2VzJXVldSV1pXcleGV5ZXiliGWKJYu" +
	"li+WQpZMlk+WS5Z3llyWXpZdll+WZpZylmyWjZaYlpWWl5aqlqeWsZaylrCWtJa2lriWuZbOlsuWyZbNiU2W3JcNltWW+ZcElwaXCJcTlw6XEZcPlxaXGZcklyqXMJc5lz2XPpdEl0aXSJdCl0mXXJdgl2SXZpdoUtKXa5dxl3mXhZd8l4GXepeGl4uXj5eQl5yXqJem" +
	"l6OXs5e0l8OXxpfIl8uX3Jftn0+X8nrfl/aX9ZgPmAyYOJgkmCGYN5g9mEaYT5hLmGuYb5hw////////mHGYdJhzmKqYr5ixmLaYxJjDmMaY6ZjrmQOZCZkSmRSZGJkhmR2ZHpkkmSCZLJkumT2ZPplCmUmZRZlQmUuZUZlSmUyZVZmXmZiZpZmtma6ZvJnfmduZ3ZnY" +
	"mdGZ7ZnumfGZ8pn7mfiaAZoPmgWZ4poZmiuaN5pFmkKaQJpD//+aPppVmk2aW5pXml+aYpplmmSaaZprmmqarZqwmryawJrPmtGa05rUmt6a35rimuOa5prvmuua7pr0mvGa95r7mwabGJsamx+bIpsjmyWbJ5somymbKpsumy+bMptEm0ObT5tNm06bUZtYm3Sbk5uD" +
	"m5GblpuXm5+boJuom7SbwJvKm7mbxpvPm9Gb0pvjm+Kb5JvUm+GcOpvym/Gb8JwVnBScCZwTnAycBpwInBKcCpwEnC6cG5wlnCScIZwwnEecMpxGnD6cWpxgnGecdpx4nOec7JzwnQmdCJzrnQOdBp0qnSadr50jnR+dRJ0VnRKdQZ0/nT6dRp1I////////nV2dXp1k" +
	"nVGdUJ1ZnXKdiZ2Hnaudb516nZqdpJ2pnbKdxJ3BnbuduJ26ncadz53Cndmd0534nead7Z3vnf2eGp4bnh6edZ55nn2egZ6InouejJ6SnpWekZ6dnqWeqZ64nqqerZdhnsyezp7PntCe1J7cnt6e3Z7gnuWe6J7v//+e9J72nvee+Z77nvye/Z8Hnwh2t58VnyGfLJ8+" +
	"n0qfUp9Un2OfX59gn2GfZp9nn2yfap93n3Kfdp+Vn5yfoFgvaceQWXRkUdxxmf//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////" +
	"////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////" +
	"////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////" +
	"/////////////////////////////////////////////w=="

var unicdeToQRKanji [1 << 16]int

func init() {
	for i := range unicdeToQRKanji {
		unicdeToQRKanji[i] = -1
	}

	bytes, _ := base64.StdEncoding.DecodeString(packedQRKanjiToUnicode)
	for i := 0; i < len(bytes); i += 2 {
		c := int(bytes[i]&0xFF)<<8 | int(bytes[i+1]&0xFF)
		if c == 0xFFFF {
			continue
		}

		unicdeToQRKanji[c] = i / 2
	}
}