// Test ported from Golang
// https://github.com/golang/go/blob/2cc15b1/src/encoding/csv/reader_test.go
import { test, runIfMain } from "../testing/mod.ts";
import { assertEquals, assert } from "../testing/asserts.ts";
import { readAll, parse } from "./csv.ts";
import { StringReader } from "../io/readers.ts";
import { BufReader } from "../io/bufio.ts";

const ErrInvalidDelim = "Invalid Delimiter";
const ErrFieldCount = "wrong number of fields";
const ErrBareQuote = 'bare " in non-quoted-field';

// TODO(zekth): Activate remaining tests
const testCases = [
  {
    Name: "Simple",
    Input: "a,b,c\n",
    Output: [["a", "b", "c"]]
  },
  {
    Name: "CRLF",
    Input: "a,b\r\nc,d\r\n",
    Output: [
      ["a", "b"],
      ["c", "d"]
    ]
  },
  {
    Name: "BareCR",
    Input: "a,b\rc,d\r\n",
    Output: [["a", "b\rc", "d"]]
  },
  //   {
  //     Name: "RFC4180test",
  //     Input: `#field1,field2,field3
  // "aaa","bbb","ccc"
  // "a,a","bbb","ccc"
  // zzz,yyy,xxx`,
  //     UseFieldsPerRecord: true,
  //     FieldsPerRecord: 0,
  //     Output: [
  //       ["#field1", "field2", "field3"],
  //       ["aaa", "bbb", "ccc"],
  //       ["a,a", `bbb`, "ccc"],
  //       ["zzz", "yyy", "xxx"]
  //     ]
  //   },
  {
    Name: "NoEOLTest",
    Input: "a,b,c",
    Output: [["a", "b", "c"]]
  },
  {
    Name: "Semicolon",
    Input: "a;b;c\n",
    Output: [["a", "b", "c"]],
    Comma: ";"
  },
  //   {
  //     Name: "MultiLine",
  //     Input: `"two
  // line","one line","three
  // line
  // field"`,
  //     Output: [["two\nline"], ["one line"], ["three\nline\nfield"]]
  //   },
  {
    Name: "BlankLine",
    Input: "a,b,c\n\nd,e,f\n\n",
    Output: [
      ["a", "b", "c"],
      ["d", "e", "f"]
    ]
  },
  {
    Name: "BlankLineFieldCount",
    Input: "a,b,c\n\nd,e,f\n\n",
    Output: [
      ["a", "b", "c"],
      ["d", "e", "f"]
    ],
    UseFieldsPerRecord: true,
    FieldsPerRecord: 0
  },
  {
    Name: "TrimSpace",
    Input: " a,  b,   c\n",
    Output: [["a", "b", "c"]],
    TrimLeadingSpace: true
  },
  {
    Name: "LeadingSpace",
    Input: " a,  b,   c\n",
    Output: [[" a", "  b", "   c"]]
  },
  {
    Name: "Comment",
    Input: "#1,2,3\na,b,c\n#comment",
    Output: [["a", "b", "c"]],
    Comment: "#"
  },
  {
    Name: "NoComment",
    Input: "#1,2,3\na,b,c",
    Output: [
      ["#1", "2", "3"],
      ["a", "b", "c"]
    ]
  },
  {
    Name: "LazyQuotes",
    Input: `a "word","1"2",a","b`,
    Output: [[`a "word"`, `1"2`, `a"`, `b`]],
    LazyQuotes: true
  },
  {
    Name: "BareQuotes",
    Input: `a "word","1"2",a"`,
    Output: [[`a "word"`, `1"2`, `a"`]],
    LazyQuotes: true
  },
  {
    Name: "BareDoubleQuotes",
    Input: `a""b,c`,
    Output: [[`a""b`, `c`]],
    LazyQuotes: true
  },
  {
    Name: "BadDoubleQuotes",
    Input: `a""b,c`,
    Error: ErrBareQuote
    // Error: &ParseError{StartLine: 1, Line: 1, Column: 1, Err: ErrBareQuote},
  },
  {
    Name: "TrimQuote",
    Input: ` "a"," b",c`,
    Output: [["a", " b", "c"]],
    TrimLeadingSpace: true
  },
  {
    Name: "BadBareQuote",
    Input: `a "word","b"`,
    Error: ErrBareQuote
    // &ParseError{StartLine: 1, Line: 1, Column: 2, Err: ErrBareQuote}
  },
  {
    Name: "BadTrailingQuote",
    Input: `"a word",b"`,
    Error: ErrBareQuote
  },
  {
    Name: "ExtraneousQuote",
    Input: `"a "word","b"`,
    Error: ErrBareQuote
  },
  {
    Name: "BadFieldCount",
    Input: "a,b,c\nd,e",
    Error: ErrFieldCount,
    UseFieldsPerRecord: true,
    FieldsPerRecord: 0
  },
  {
    Name: "BadFieldCount1",
    Input: `a,b,c`,
    // Error: &ParseError{StartLine: 1, Line: 1, Err: ErrFieldCount},
    UseFieldsPerRecord: true,
    FieldsPerRecord: 2,
    Error: ErrFieldCount
  },
  {
    Name: "FieldCount",
    Input: "a,b,c\nd,e",
    Output: [
      ["a", "b", "c"],
      ["d", "e"]
    ]
  },
  {
    Name: "TrailingCommaEOF",
    Input: "a,b,c,",
    Output: [["a", "b", "c", ""]]
  },
  {
    Name: "TrailingCommaEOL",
    Input: "a,b,c,\n",
    Output: [["a", "b", "c", ""]]
  },
  {
    Name: "TrailingCommaSpaceEOF",
    Input: "a,b,c, ",
    Output: [["a", "b", "c", ""]],
    TrimLeadingSpace: true
  },
  {
    Name: "TrailingCommaSpaceEOL",
    Input: "a,b,c, \n",
    Output: [["a", "b", "c", ""]],
    TrimLeadingSpace: true
  },
  {
    Name: "TrailingCommaLine3",
    Input: "a,b,c\nd,e,f\ng,hi,",
    Output: [
      ["a", "b", "c"],
      ["d", "e", "f"],
      ["g", "hi", ""]
    ],
    TrimLeadingSpace: true
  },
  {
    Name: "NotTrailingComma3",
    Input: "a,b,c, \n",
    Output: [["a", "b", "c", " "]]
  },
  {
    Name: "CommaFieldTest",
    Input: `x,y,z,w
x,y,z,
x,y,,
x,,,
,,,
"x","y","z","w"
"x","y","z",""
"x","y","",""
"x","","",""
"","","",""
`,
    Output: [
      ["x", "y", "z", "w"],
      ["x", "y", "z", ""],
      ["x", "y", "", ""],
      ["x", "", "", ""],
      ["", "", "", ""],
      ["x", "y", "z", "w"],
      ["x", "y", "z", ""],
      ["x", "y", "", ""],
      ["x", "", "", ""],
      ["", "", "", ""]
    ]
  },
  {
    Name: "TrailingCommaIneffective1",
    Input: "a,b,\nc,d,e",
    Output: [
      ["a", "b", ""],
      ["c", "d", "e"]
    ],
    TrimLeadingSpace: true
  },
  {
    Name: "ReadAllReuseRecord",
    Input: "a,b\nc,d",
    Output: [
      ["a", "b"],
      ["c", "d"]
    ],
    ReuseRecord: true
  },
  // {
  //   Name: "StartLine1", // Issue 19019
  //   Input: 'a,"b\nc"d,e',
  //   Error: true
  //   // Error: &ParseError{StartLine: 1, Line: 2, Column: 1, Err: ErrQuote},
  // },
  // {
  //   Name: "StartLine2",
  //   Input: 'a,b\n"d\n\n,e',
  //   Error: true
  //   // Error: &ParseError{StartLine: 2, Line: 5, Column: 0, Err: ErrQuote},
  // },
  // {
  //   Name: "CRLFInQuotedField", // Issue 21201
  //   Input: 'A,"Hello\r\nHi",B\r\n',
  //   Output: [["A", "Hello\nHi", "B"]]
  // },
  {
    Name: "BinaryBlobField", // Issue 19410
    Input: "x09\x41\xb4\x1c,aktau",
    Output: [["x09A\xb4\x1c", "aktau"]]
  },
  // {
  //   Name: "TrailingCR",
  //   Input: "field1,field2\r",
  //   Output: [["field1", "field2"]]
  // },
  // {
  //   Name: "QuotedTrailingCR",
  //   Input: '"field"\r',
  //   Output: [['"field"']]
  // },
  // {
  //   Name: "QuotedTrailingCRCR",
  //   Input: '"field"\r\r',
  //   Error: true,
  //   // Error: &ParseError{StartLine: 1, Line: 1, Column: 6, Err: ErrQuote},
  // },
  // {
  //   Name: "FieldCR",
  //   Input: "field\rfield\r",
  //   Output: [["field\rfield"]]
  // },
  // {
  //   Name: "FieldCRCR",
  //   Input: "field\r\rfield\r\r",
  //   Output: [["field\r\rfield\r"]]
  // },
  {
    Name: "FieldCRCRLF",
    Input: "field\r\r\nfield\r\r\n",
    Output: [["field\r"], ["field\r"]]
  },
  {
    Name: "FieldCRCRLFCR",
    Input: "field\r\r\n\rfield\r\r\n\r",
    Output: [["field\r"], ["\rfield\r"]]
  },
  // {
  //   Name: "FieldCRCRLFCRCR",
  //   Input: "field\r\r\n\r\rfield\r\r\n\r\r",
  //   Output: [["field\r"], ["\r\rfield\r"], ["\r"]]
  // },
  // {
  //   Name: "MultiFieldCRCRLFCRCR",
  //   Input: "field1,field2\r\r\n\r\rfield1,field2\r\r\n\r\r,",
  //   Output: [
  //     ["field1", "field2\r"],
  //     ["\r\rfield1", "field2\r"],
  //     ["\r\r", ""]
  //   ]
  // },
  {
    Name: "NonASCIICommaAndComment",
    Input: "a£b,c£ \td,e\n€ comment\n",
    Output: [["a", "b,c", "d,e"]],
    TrimLeadingSpace: true,
    Comma: "£",
    Comment: "€"
  },
  {
    Name: "NonASCIICommaAndCommentWithQuotes",
    Input: 'a€"  b,"€ c\nλ comment\n',
    Output: [["a", "  b,", " c"]],
    Comma: "€",
    Comment: "λ"
  },
  {
    // λ and θ start with the same byte.
    // This tests that the parser doesn't confuse such characters.
    Name: "NonASCIICommaConfusion",
    Input: '"abθcd"λefθgh',
    Output: [["abθcd", "efθgh"]],
    Comma: "λ",
    Comment: "€"
  },
  {
    Name: "NonASCIICommentConfusion",
    Input: "λ\nλ\nθ\nλ\n",
    Output: [["λ"], ["λ"], ["λ"]],
    Comment: "θ"
  },
  // {
  //   Name: "QuotedFieldMultipleLF",
  //   Input: '"\n\n\n\n"',
  //   Output: [["\n\n\n\n"]]
  // },
  // {
  //   Name: "MultipleCRLF",
  //   Input: "\r\n\r\n\r\n\r\n"
  // },
  /**
   * The implementation may read each line in several chunks if
   * it doesn't fit entirely.
   * in the read buffer, so we should test the code to handle that condition.
   */
  // {
  //   Name: "HugeLines",
  //   Input:
  //     strings.Repeat("#ignore\n", 10000) +
  //     strings.Repeat("@", 5000) +
  //     "," +
  //     strings.Repeat("*", 5000),
  //   Output: [[strings.Repeat("@", 5000), strings.Repeat("*", 5000)]],
  //   Comment: "#"
  // },
  {
    Name: "QuoteWithTrailingCRLF",
    Input: '"foo"bar"\r\n',
    Error: ErrBareQuote
    // Error: &ParseError{StartLine: 1, Line: 1, Column: 4, Err: ErrQuote},
  },
  {
    Name: "LazyQuoteWithTrailingCRLF",
    Input: '"foo"bar"\r\n',
    Output: [[`foo"bar`]],
    LazyQuotes: true
  },
  // {
  //   Name: "DoubleQuoteWithTrailingCRLF",
  //   Input: '"foo""bar"\r\n',
  //   Output: [[`foo"bar`]]
  // },
  // {
  //   Name: "EvenQuotes",
  //   Input: `""""""""`,
  //   Output: [[`"""`]]
  // },
  // {
  //   Name: "OddQuotes",
  //   Input: `"""""""`,
  //   Error: true
  //   // Error:" &ParseError{StartLine: 1, Line: 1, Column: 7, Err: ErrQuote}",
  // },
  // {
  //   Name: "LazyOddQuotes",
  //   Input: `"""""""`,
  //   Output: [[`"""`]],
  //   LazyQuotes: true
  // },
  {
    Name: "BadComma1",
    Comma: "\n",
    Error: ErrInvalidDelim
  },
  {
    Name: "BadComma2",
    Comma: "\r",
    Error: ErrInvalidDelim
  },
  {
    Name: "BadComma3",
    Comma: '"',
    Error: ErrInvalidDelim
  },
  {
    Name: "BadComment1",
    Comment: "\n",
    Error: ErrInvalidDelim
  },
  {
    Name: "BadComment2",
    Comment: "\r",
    Error: ErrInvalidDelim
  },
  {
    Name: "BadCommaComment",
    Comma: "X",
    Comment: "X",
    Error: ErrInvalidDelim
  }
];
for (const t of testCases) {
  test({
    name: `[CSV] ${t.Name}`,
    async fn(): Promise<void> {
      let comma = ",";
      let comment;
      let fieldsPerRec;
      let trim = false;
      let lazyquote = false;
      if (t.Comma) {
        comma = t.Comma;
      }
      if (t.Comment) {
        comment = t.Comment;
      }
      if (t.TrimLeadingSpace) {
        trim = true;
      }
      if (t.UseFieldsPerRecord) {
        fieldsPerRec = t.FieldsPerRecord;
      }
      if (t.LazyQuotes) {
        lazyquote = t.LazyQuotes;
      }
      let actual;
      if (t.Error) {
        let err;
        try {
          actual = await readAll(new BufReader(new StringReader(t.Input!)), {
            comma: comma,
            comment: comment,
            trimLeadingSpace: trim,
            fieldsPerRecord: fieldsPerRec,
            lazyQuotes: lazyquote
          });
        } catch (e) {
          err = e;
        }
        assert(err);
        assertEquals(err.message, t.Error);
      } else {
        actual = await readAll(new BufReader(new StringReader(t.Input!)), {
          comma: comma,
          comment: comment,
          trimLeadingSpace: trim,
          fieldsPerRecord: fieldsPerRec,
          lazyQuotes: lazyquote
        });
        const expected = t.Output;
        assertEquals(actual, expected);
      }
    }
  });
}

const parseTestCases = [
  {
    name: "simple",
    in: "a,b,c",
    header: false,
    result: [["a", "b", "c"]]
  },
  {
    name: "simple Bufreader",
    in: new BufReader(new StringReader("a,b,c")),
    header: false,
    result: [["a", "b", "c"]]
  },
  {
    name: "multiline",
    in: "a,b,c\ne,f,g\n",
    header: false,
    result: [
      ["a", "b", "c"],
      ["e", "f", "g"]
    ]
  },
  {
    name: "header mapping boolean",
    in: "a,b,c\ne,f,g\n",
    header: true,
    result: [{ a: "e", b: "f", c: "g" }]
  },
  {
    name: "header mapping array",
    in: "a,b,c\ne,f,g\n",
    header: ["this", "is", "sparta"],
    result: [
      { this: "a", is: "b", sparta: "c" },
      { this: "e", is: "f", sparta: "g" }
    ]
  },
  {
    name: "header mapping object",
    in: "a,b,c\ne,f,g\n",
    header: [{ name: "this" }, { name: "is" }, { name: "sparta" }],
    result: [
      { this: "a", is: "b", sparta: "c" },
      { this: "e", is: "f", sparta: "g" }
    ]
  },
  {
    name: "header mapping parse entry",
    in: "a,b,c\ne,f,g\n",
    header: [
      {
        name: "this",
        parse: (e: string): string => {
          return `b${e}$$`;
        }
      },
      {
        name: "is",
        parse: (e: string): number => {
          return e.length;
        }
      },
      {
        name: "sparta",
        parse: (e: string): unknown => {
          return { bim: `boom-${e}` };
        }
      }
    ],
    result: [
      { this: "ba$$", is: 1, sparta: { bim: `boom-c` } },
      { this: "be$$", is: 1, sparta: { bim: `boom-g` } }
    ]
  },
  {
    name: "multiline parse",
    in: "a,b,c\ne,f,g\n",
    parse: (e: string[]): unknown => {
      return { super: e[0], street: e[1], fighter: e[2] };
    },
    header: false,
    result: [
      { super: "a", street: "b", fighter: "c" },
      { super: "e", street: "f", fighter: "g" }
    ]
  },
  {
    name: "header mapping object parseline",
    in: "a,b,c\ne,f,g\n",
    header: [{ name: "this" }, { name: "is" }, { name: "sparta" }],
    parse: (e: Record<string, unknown>): unknown => {
      return { super: e.this, street: e.is, fighter: e.sparta };
    },
    result: [
      { super: "a", street: "b", fighter: "c" },
      { super: "e", street: "f", fighter: "g" }
    ]
  }
];

for (const testCase of parseTestCases) {
  test({
    name: `[CSV] Parse ${testCase.name}`,
    async fn(): Promise<void> {
      const r = await parse(testCase.in, {
        header: testCase.header,
        parse: testCase.parse as (input: unknown) => unknown
      });
      assertEquals(r, testCase.result);
    }
  });
}

runIfMain(import.meta);