import os
import toml
import toml.ast
import x.json2

const hide_oks = os.getenv('VTEST_HIDE_OK') == '1'

// Instructions for developers:
// The actual tests and data can be obtained by doing:
// `cd vlib/toml/tests/testdata`
// `git clone --depth 1 https://github.com/BurntSushi/toml-test.git burntsushi/toml-test`
// See also the CI toml tests
const (
	// Kept for easier handling of future updates to the tests
	valid_exceptions       = [
		'comment/everywhere.toml',
	]
	invalid_exceptions     = [
		'datetime/hour-over.toml',
		'datetime/mday-under.toml',
		'datetime/minute-over.toml',
		'datetime/month-under.toml',
		'datetime/second-over.toml',
	]
	valid_value_exceptions = []string{}
	// BUG with string interpolation of '${i64(-9223372036854775808)}') see below for workaround
	//'integer/long.toml', // TODO https://github.com/vlang/v/issues/9507

	jq                     = os.find_abs_path_of_executable('jq') or { '' }
	compare_work_dir_root  = os.join_path(os.temp_dir(), 'v', 'toml', 'burntsushi')
	// From: https://stackoverflow.com/a/38266731/1904615
	jq_normalize           = r'# Apply f to composite entities recursively using keys[], and to atoms
def sorted_walk(f):
  . as $in
  | if type == "object" then
      reduce keys[] as $key
        ( {}; . + { ($key):  ($in[$key] | sorted_walk(f)) } ) | f
  elif type == "array" then map( sorted_walk(f) ) | f
  else f
  end;

def normalize: sorted_walk(if type == "array" then sort else . end);

normalize'
)

fn run(args []string) ?string {
	res := os.execute(args.join(' '))
	if res.exit_code != 0 {
		return error('${args[0]} failed with return code ${res.exit_code}.\n$res.output')
	}
	return res.output
}

// test_burnt_sushi_tomltest run though 'testdata/burntsushi/toml-test/*' if found.
fn test_burnt_sushi_tomltest() ? {
	this_file := @FILE
	test_root := os.join_path(os.dir(this_file), 'testdata', 'burntsushi', 'toml-test',
		'tests')
	if !os.is_dir(test_root) {
		println('No test data directory found in "$test_root"')
		assert true
		return
	}
	valid_folder := os.join_path('toml-test', 'tests', 'valid')
	invalid_folder := os.join_path('toml-test', 'tests', 'invalid')
	valid_test_files := os.walk_ext(os.join_path(test_root, 'valid'), '.toml')
	println('Testing $valid_test_files.len valid TOML files...')
	mut valid := 0
	mut e := 0
	for i, valid_test_file in valid_test_files {
		mut relative := valid_test_file.all_after(valid_folder).trim_left(os.path_separator)
		$if windows {
			relative = relative.replace('/', '\\')
		}
		if relative in valid_exceptions {
			e++
			idx := valid_exceptions.index(relative) + 1
			println('SKIP [${i + 1}/$valid_test_files.len] "$valid_test_file" VALID EXCEPTION [$idx/$valid_exceptions.len]...')
			continue
		}
		if !hide_oks {
			println('OK   [${i + 1}/$valid_test_files.len] "$valid_test_file"...')
		}
		toml_doc := toml.parse_file(valid_test_file) ?
		valid++
	}
	println('$valid/$valid_test_files.len TOML files were parsed correctly')
	if valid_exceptions.len > 0 {
		println('TODO Skipped parsing of $valid_exceptions.len valid TOML files...')
	}

	// If the command-line tool `jq` is installed, value tests can be run as well.
	if jq != '' {
		println('Testing value output of $valid_test_files.len valid TOML files using "$jq"...')

		if os.exists(compare_work_dir_root) {
			os.rmdir_all(compare_work_dir_root) ?
		}
		os.mkdir_all(compare_work_dir_root) ?

		jq_normalize_path := os.join_path(compare_work_dir_root, 'normalize.jq')
		os.write_file(jq_normalize_path, jq_normalize) ?

		valid = 0
		e = 0
		for i, valid_test_file in valid_test_files {
			mut relative := valid_test_file.all_after(valid_folder).trim_left(os.path_separator)
			$if windows {
				relative = relative.replace('/', '\\')
			}
			// Skip the file if we know it can't be parsed or we know that the value retrieval needs work.
			if relative in valid_exceptions {
				e++
				idx := valid_exceptions.index(relative) + 1
				println('SKIP [${i + 1}/$valid_test_files.len] "$valid_test_file" VALID EXCEPTION [$idx/$valid_exceptions.len]...')
				continue
			}
			if relative in valid_value_exceptions {
				e++
				idx := valid_value_exceptions.index(relative) + 1
				println('SKIP [${i + 1}/$valid_test_files.len] "$valid_test_file" VALID VALUE EXCEPTION [$idx/$valid_value_exceptions.len]...')
				continue
			}

			if !hide_oks {
				println('OK   [${i + 1}/$valid_test_files.len] "$valid_test_file"...')
			}
			toml_doc := toml.parse_file(valid_test_file) ?

			v_toml_json_path := os.join_path(compare_work_dir_root,
				os.file_name(valid_test_file).all_before_last('.') + '.v.json')
			bs_toml_json_path := os.join_path(compare_work_dir_root,
				os.file_name(valid_test_file).all_before_last('.') + '.json')

			os.write_file(v_toml_json_path, to_burntsushi(toml_doc.ast.table)) ?

			bs_json := os.read_file(valid_test_file.all_before_last('.') + '.json') ?

			os.write_file(bs_toml_json_path, bs_json) ?

			v_normalized_json := run([jq, '-S', '-f "$jq_normalize_path"', v_toml_json_path]) or {
				contents := os.read_file(v_toml_json_path) ?
				panic(err.msg + '\n$contents')
			}
			bs_normalized_json := run([jq, '-S', '-f "$jq_normalize_path"', bs_toml_json_path]) or {
				contents := os.read_file(v_toml_json_path) ?
				panic(err.msg + '\n$contents')
			}

			assert bs_normalized_json == v_normalized_json

			valid++
		}
	}
	println('$valid/$valid_test_files.len TOML files were parsed correctly and value checked')
	if valid_value_exceptions.len > 0 {
		println('TODO Skipped value checks of $valid_value_exceptions.len valid TOML files...')
	}

	invalid_test_files := os.walk_ext(os.join_path(test_root, 'invalid'), '.toml')
	println('Testing $invalid_test_files.len invalid TOML files...')
	mut invalid := 0
	e = 0
	for i, invalid_test_file in invalid_test_files {
		mut relative := invalid_test_file.all_after(invalid_folder).trim_left(os.path_separator)
		$if windows {
			relative = relative.replace('/', '\\')
		}
		if relative in invalid_exceptions {
			e++
			idx := invalid_exceptions.index(relative) + 1
			println('SKIP [${i + 1}/$invalid_test_files.len] "$invalid_test_file" INVALID EXCEPTION [$idx/$invalid_exceptions.len]...')
			continue
		}
		if !hide_oks {
			println('OK   [${i + 1}/$invalid_test_files.len] "$invalid_test_file"...')
		}
		if toml_doc := toml.parse_file(invalid_test_file) {
			content_that_should_have_failed := os.read_file(invalid_test_file) ?
			println('     This TOML should have failed:\n${'-'.repeat(40)}\n$content_that_should_have_failed\n${'-'.repeat(40)}')
			assert false
		} else {
			if !hide_oks {
				println('     $err.msg')
			}
			assert true
		}
		invalid++
	}
	println('$invalid/$invalid_test_files.len TOML files were parsed correctly')
	if invalid_exceptions.len > 0 {
		println('TODO Skipped parsing of $invalid_exceptions.len invalid TOML files...')
	}
}

// to_burntsushi returns a BurntSushi compatible json string converted from the `value` ast.Value.
fn to_burntsushi(value ast.Value) string {
	match value {
		ast.Quoted {
			json_text := json2.Any(value.text).json_str()
			return '{ "type": "string", "value": "$json_text" }'
		}
		ast.DateTime {
			// Normalization for json
			json_text := json2.Any(value.text).json_str().to_upper().replace(' ', 'T')
			typ := if json_text.ends_with('Z') || json_text.all_after('T').contains('-')
				|| json_text.all_after('T').contains('+') {
				'datetime'
			} else {
				'datetime-local'
			}
			return '{ "type": "$typ", "value": "$json_text" }'
		}
		ast.Date {
			json_text := json2.Any(value.text).json_str()
			return '{ "type": "date-local", "value": "$json_text" }'
		}
		ast.Time {
			json_text := json2.Any(value.text).json_str()
			return '{ "type": "time-local", "value": "$json_text" }'
		}
		ast.Bool {
			json_text := json2.Any(value.text.bool()).json_str()
			return '{ "type": "bool", "value": "$json_text" }'
		}
		ast.Null {
			json_text := json2.Any(value.text).json_str()
			return '{ "type": "null", "value": "$json_text" }'
		}
		ast.Number {
			if value.text.contains('inf') || value.text.contains('nan') {
				return '{ "type": "float", "value": "$value.text" }'
			}
			if !value.text.starts_with('0x')
				&& (value.text.contains('.') || value.text.to_lower().contains('e')) {
				mut val := '$value.f64()'.replace('.e+', '.0e') // json notation
				if !val.contains('.') && val != '0' { // json notation
					val += '.0'
				}
				return '{ "type": "float", "value": "$val" }'
			}
			v := value.i64()
			// TODO workaround https://github.com/vlang/v/issues/9507
			if v == i64(-9223372036854775807 - 1) {
				return '{ "type": "integer", "value": "-9223372036854775808" }'
			}
			return '{ "type": "integer", "value": "$v" }'
		}
		map[string]ast.Value {
			mut str := '{ '
			for key, val in value {
				json_key := json2.Any(key).json_str()
				str += ' "$json_key": ${to_burntsushi(val)},'
			}
			str = str.trim_right(',')
			str += ' }'
			return str
		}
		[]ast.Value {
			mut str := '[ '
			for val in value {
				str += ' ${to_burntsushi(val)},'
			}
			str = str.trim_right(',')
			str += ' ]\n'
			return str
		}
	}
	return '<error>'
}