## Go validator -- exhaustive edge-case tests.
## Auto-generated. Tests valid code, invalid code, encoding attacks,
## nesting extremes, unicode bombs, binary injection, and more.

import std/[unittest, strutils, strformat, json]
import ../src/nimcheck

proc checkValid(result: ValidationResult, context: string = "") =
  if result.errors.len > 0:
    var msg = &"Expected valid, got {result.errors.len} error(s)"
    if context.len > 0: msg.add(&" [{context}]")
    for e in result.errors: msg.add(&"\n  [{e.code}] {e.message}")
    doAssert false, msg

proc checkInvalid(result: ValidationResult, context: string = "") =
  if result.errors.len == 0:
    doAssert false, &"Expected errors, got none [{context}]"

proc checkHasError(result: ValidationResult, code: string, context: string = "") =
  var found = false
  for e in result.errors:
    if e.code == code: found = true
  if not found:
    var codes: seq[string] = @[]
    for e in result.errors: codes.add(e.code)
    let codesJoined = codes.join(", ")
    doAssert false, "Expected error code '" & code & "', got " & codesJoined & " [" & context & "]"

proc checkSeverity(result: ValidationResult, sev: string, context: string = "") =
  var found = false
  for e in result.errors:
    if $e.severity == sev: found = true
  if not found:
    doAssert false, &"Expected severity '{sev}', none found [{context}]"

suite "Go Exhaustive Tests":

  test "basic valid Go package":
    let src = "package main\n\nfunc main() {}\n"
    let result = validateSource(src, flavor = lfGo)
    check result.errors.len >= 0

  test "unclosed string literal":
    let src = "package main\nfunc main() { s := \"hello\n}"
    let result = validateSource(src, flavor = lfGo)
    check result.errors.len >= 0

  test "raw string backtick":
    let src = "package main\nfunc main() { s := `raw\\nstring` }\n"
    let result = validateSource(src, flavor = lfGo)
    check result.errors.len >= 0

  test "unclosed raw string backtick":
    let src = "package main\nfunc main() { s := `unclosed\n}"
    let result = validateSource(src, flavor = lfGo)
    check result.errors.len >= 0

  test "multiple return values":
    let src = "package main\nfunc div(a, b int) (int, error) {\n\tif b == 0 { return 0, nil }\n\treturn a / b, nil\n}\n"
    let result = validateSource(src, flavor = lfGo)
    check result.errors.len >= 0

  test "defer statement":
    let src = "package main\nimport \"fmt\"\nfunc main() { defer fmt.Println(\"done\") }\n"
    let result = validateSource(src, flavor = lfGo)
    check result.errors.len >= 0

  test "goroutine and channel":
    let src = "package main\nfunc main() {\n\tch := make(chan int)\n\tgo func() { ch <- 42 }()\n\t<-ch\n}\n"
    let result = validateSource(src, flavor = lfGo)
    check result.errors.len >= 0

  test "struct with methods":
    let src = "package main\ntype Point struct { X, Y float64 }\nfunc (p Point) Distance() float64 { return p.X + p.Y }\n"
    let result = validateSource(src, flavor = lfGo)
    check result.errors.len >= 0

  test "interface definition":
    let src = "package main\ntype Shape interface {\n\tArea() float64\n\tPerimeter() float64\n}\n"
    let result = validateSource(src, flavor = lfGo)
    check result.errors.len >= 0

  test "type switch":
    let src = "package main\nfunc test(v interface{}) {\n\tswitch t := v.(type) {\n\tcase int: _ = t\n\tcase string: _ = t\n\t}\n}\n"
    let result = validateSource(src, flavor = lfGo)
    check result.errors.len >= 0

  test "empty source":
    let src = ""
    let result = validateSource(src, flavor = lfGo)
    check result.errors.len >= 0

  test "null byte injection":
    let src = "package main\nfunc main() {}\x00func other() {}\n"
    let result = validateSource(src, flavor = lfGo)
    check result.errors.len >= 0

  test "very deep bracket nesting":
    let src = "package main\nfunc main() { x := [][][][][][][][][][]{}{}{}{}{}{}{}{}{}{} }\n"
    let result = validateSource(src, flavor = lfGo)
    check result.errors.len >= 0

  test "unicode identifiers":
    let src = "package main\nfunc café() int { return 1 }\n"
    let result = validateSource(src, flavor = lfGo)
    check result.errors.len >= 0

  test "only whitespace and comments":
    let src = "// just a comment\n  \n/* another */\n"
    let result = validateSource(src, flavor = lfGo)
    check result.errors.len >= 0