package review

import (
	"encoding/json"
	"testing"
)

func TestParseResponse_ValidJSON(t *testing.T) {
	input := `{
		"verdict": "APPROVE",
		"summary": "Looks good",
		"findings": [
			{"severity": "NIT", "file": "main.go", "line": 10, "finding": "Consider renaming"}
		],
		"recommendation": "Ship it"
	}`

	result, err := ParseResponse(input)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if result.Verdict != "APPROVE" {
		t.Errorf("expected verdict APPROVE, got %q", result.Verdict)
	}
	if result.Summary != "Looks good" {
		t.Errorf("expected summary %q, got %q", "Looks good", result.Summary)
	}
	if len(result.Findings) != 1 {
		t.Fatalf("expected 1 finding, got %d", len(result.Findings))
	}
	if result.Findings[0].Severity != "NIT" {
		t.Errorf("expected severity NIT, got %q", result.Findings[0].Severity)
	}
	if result.Findings[0].File != "main.go" {
		t.Errorf("expected file main.go, got %q", result.Findings[0].File)
	}
	if result.Findings[0].Line != 10 {
		t.Errorf("expected line 10, got %d", result.Findings[0].Line)
	}
	if result.Recommendation != "Ship it" {
		t.Errorf("expected recommendation %q, got %q", "Ship it", result.Recommendation)
	}
}

func TestParseResponse_MarkdownFences(t *testing.T) {
	input := "```json\n{\"verdict\": \"REQUEST_CHANGES\", \"summary\": \"Issues found\", \"findings\": [{\"severity\": \"MAJOR\", \"file\": \"a.go\", \"line\": 5, \"finding\": \"Bug\"}], \"recommendation\": \"Fix it\"}\n```"

	result, err := ParseResponse(input)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if result.Verdict != "REQUEST_CHANGES" {
		t.Errorf("expected verdict REQUEST_CHANGES, got %q", result.Verdict)
	}
	if len(result.Findings) != 1 {
		t.Fatalf("expected 1 finding, got %d", len(result.Findings))
	}
	if result.Findings[0].Severity != "MAJOR" {
		t.Errorf("expected severity MAJOR, got %q", result.Findings[0].Severity)
	}
}

func TestParseResponse_InvalidJSON(t *testing.T) {
	_, err := ParseResponse("this is not json")
	if err == nil {
		t.Fatal("expected error for invalid JSON, got nil")
	}
}

func TestParseResponse_InvalidVerdict(t *testing.T) {
	input := `{"verdict": "MAYBE", "summary": "Hmm", "findings": [], "recommendation": "Dunno"}`
	_, err := ParseResponse(input)
	if err == nil {
		t.Fatal("expected error for invalid verdict, got nil")
	}
}

func TestParseResponse_InvalidSeverity(t *testing.T) {
	input := `{"verdict": "APPROVE", "summary": "Ok", "findings": [{"severity": "CRITICAL", "file": "x.go", "line": 1, "finding": "bad"}], "recommendation": "Fix"}`
	_, err := ParseResponse(input)
	if err == nil {
		t.Fatal("expected error for invalid severity, got nil")
	}
}

func TestParseResponse_EmptyFindings(t *testing.T) {
	input := `{"verdict": "APPROVE", "summary": "All good", "findings": [], "recommendation": "Merge"}`
	result, err := ParseResponse(input)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if len(result.Findings) != 0 {
		t.Errorf("expected 0 findings, got %d", len(result.Findings))
	}
}

func TestParseResponse_MissingFields(t *testing.T) {
	// verdict is empty string — should fail validation
	input := `{"summary": "Ok", "findings": [], "recommendation": "Merge"}`
	_, err := ParseResponse(input)
	if err == nil {
		t.Fatal("expected error for missing verdict, got nil")
	}
}

func TestParseResponse_MarkdownFencesNoLang(t *testing.T) {
	input := "```\n{\"verdict\": \"APPROVE\", \"summary\": \"Fine\", \"findings\": [], \"recommendation\": \"Good\"}\n```"
	result, err := ParseResponse(input)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if result.Verdict != "APPROVE" {
		t.Errorf("expected APPROVE, got %q", result.Verdict)
	}
}

func TestParseResponse_UnescapedQuotesInStrings(t *testing.T) {
	// Real failure from CI: Sonnet puts unescaped quotes like (e.g. "28") in findings
	input := `{"verdict": "APPROVE", "summary": "Clean PR", "findings": [{"severity": "NIT", "file": "ci/Dockerfile", "line": 14, "finding": "The comment says OTP_VERSION is the major version (e.g. \"28\") but it actually contains unescaped quotes like (e.g. "28") which breaks JSON"}], "recommendation": "Ship it"}`

	result, err := ParseResponse(input)
	if err != nil {
		t.Fatalf("expected repair to handle unescaped quotes, got error: %v", err)
	}
	if result.Verdict != "APPROVE" {
		t.Errorf("expected APPROVE, got %q", result.Verdict)
	}
	if len(result.Findings) != 1 {
		t.Fatalf("expected 1 finding, got %d", len(result.Findings))
	}
}

func TestRepairJSON_NoOpOnValid(t *testing.T) {
	valid := `{"key": "value", "num": 42}`
	result := repairJSON(valid)
	if result != valid {
		t.Errorf("repairJSON should not modify valid JSON\n  got:  %s\n  want: %s", result, valid)
	}
}

func TestRepairJSON_FixesUnescapedQuotes(t *testing.T) {
	// Interior quote followed by non-structural character
	input := `{"msg": "use "foo" here"}`
	result := repairJSON(input)

	// Should be parseable now
	var m map[string]interface{}
	if err := json.Unmarshal([]byte(result), &m); err != nil {
		t.Fatalf("repaired JSON should parse, got: %v\nrepaired: %s", err, result)
	}
}

func TestRepairJSON_InteriorQuoteBeforeComma(t *testing.T) {
	// Bug reported by reviewer: interior quoted word immediately before a comma
	input := `{"msg": "say "yes", and go"}`
	result := repairJSON(input)

	var m map[string]interface{}
	if err := json.Unmarshal([]byte(result), &m); err != nil {
		t.Fatalf("repaired JSON should parse, got: %v\nrepaired: %s", err, result)
	}
	// The full string content should be preserved
	msg, ok := m["msg"].(string)
	if !ok {
		t.Fatal("msg field missing or not a string")
	}
	if msg != `say "yes", and go` {
		t.Errorf("unexpected msg content: %q", msg)
	}
}

func TestRepairJSON_InteriorQuoteBeforeCloseBrace(t *testing.T) {
	// Bug reported by reviewer: JSON-shaped syntax inside string values
	input := `{"msg": "input map {"key": "val"} caused error"}`
	result := repairJSON(input)

	var m map[string]interface{}
	if err := json.Unmarshal([]byte(result), &m); err != nil {
		t.Fatalf("repaired JSON should parse, got: %v\nrepaired: %s", err, result)
	}
}

func TestRepairJSON_MultipleFields(t *testing.T) {
	// Multiple string fields with unescaped quotes in different positions
	input := `{"a": "hello "world"", "b": "foo"}`
	result := repairJSON(input)

	var m map[string]interface{}
	if err := json.Unmarshal([]byte(result), &m); err != nil {
		t.Fatalf("repaired JSON should parse, got: %v\nrepaired: %s", err, result)
	}
	if _, ok := m["b"]; !ok {
		t.Error("expected 'b' field to be preserved")
	}
}

func TestRepairJSON_PreservesEscapedQuotes(t *testing.T) {
	// Already-escaped quotes should not be double-escaped
	input := `{"msg": "already \"escaped\" here"}`
	result := repairJSON(input)

	if result != input {
		t.Errorf("repairJSON should not modify already-escaped quotes\n  got:  %s\n  want: %s", result, input)
	}

	var m map[string]interface{}
	if err := json.Unmarshal([]byte(result), &m); err != nil {
		t.Fatalf("repaired JSON should parse, got: %v\nrepaired: %s", err, result)
	}
}

func TestRepairJSON_ComplexNestedContent(t *testing.T) {
	// Combines both reviewer bugs: quoted words before commas AND JSON-like content
	input := `{"verdict": "APPROVE", "findings": [{"finding": "The map {"key": "val"} and (e.g. "28") and say "yes", then stop"}]}`
	result := repairJSON(input)

	var parsed map[string]interface{}
	if err := json.Unmarshal([]byte(result), &parsed); err != nil {
		t.Fatalf("repaired JSON should parse, got: %v\nrepaired: %s", err, result)
	}
	if parsed["verdict"] != "APPROVE" {
		t.Errorf("expected verdict APPROVE, got %v", parsed["verdict"])
	}
}