package review

import (
	"strings"
	"testing"
)

func TestBuildSystemPrompt_NoConventions(t *testing.T) {
	prompt := BuildSystemPrompt("", "")

	if !strings.Contains(prompt, "expert code reviewer") {
		t.Error("expected system prompt to mention code reviewer role")
	}
	if strings.Contains(prompt, "coding conventions") {
		t.Error("should not mention conventions when empty")
	}
}

func TestBuildSystemPrompt_WithConventions(t *testing.T) {
	conventions := "- Use stdlib only\n- No panics\n"
	prompt := BuildSystemPrompt(conventions, "")

	if !strings.Contains(prompt, "coding conventions") {
		t.Error("expected conventions section")
	}
	if !strings.Contains(prompt, "Use stdlib only") {
		t.Error("expected conventions content")
	}
}

func TestBuildUserPrompt_Basic(t *testing.T) {
	prompt := BuildUserPrompt("Fix bug", "Fixes the crash", "diff content here", "", true, "all checks passed")

	if !strings.Contains(prompt, "Fix bug") {
		t.Error("expected PR title")
	}
	if !strings.Contains(prompt, "Fixes the crash") {
		t.Error("expected PR description")
	}
	if !strings.Contains(prompt, "diff content here") {
		t.Error("expected diff content")
	}
	if !strings.Contains(prompt, "PASSED") {
		t.Error("expected CI status PASSED")
	}
}

func TestBuildUserPrompt_CIFailed(t *testing.T) {
	prompt := BuildUserPrompt("Add tests", "", "some diff", "", false, "lint: failed")

	if !strings.Contains(prompt, "FAILED") {
		t.Error("expected CI status FAILED")
	}
	if !strings.Contains(prompt, "lint: failed") {
		t.Error("expected CI details")
	}
}

func TestBuildUserPrompt_NoDescription(t *testing.T) {
	prompt := BuildUserPrompt("Quick fix", "", "diff", "", true, "")

	if strings.Contains(prompt, "### Description") {
		t.Error("should not contain Description header when body is empty")
	}
}

func TestBuildUserPrompt_DiffIncluded(t *testing.T) {
	diff := "+func Hello() string {\n+\treturn \"hello\"\n+}"
	prompt := BuildUserPrompt("Greeting", "Add greeting func", diff, "", true, "")

	if !strings.Contains(prompt, "```diff") {
		t.Error("expected diff fence")
	}
	if !strings.Contains(prompt, diff) {
		t.Error("expected diff content in prompt")
	}
}

func TestBuildSystemPrompt_WithPatterns(t *testing.T) {
	patterns := "## Naming: use snake_case for functions"
	prompt := BuildSystemPrompt("", patterns)
	if !strings.Contains(prompt, "Language Patterns") {
		t.Error("expected patterns section header")
	}
	if !strings.Contains(prompt, "snake_case") {
		t.Error("expected patterns content")
	}
}

func TestBuildSystemPrompt_WithBoth(t *testing.T) {
	conventions := "Run mix format before commit"
	patterns := "Use pipe operator for transformations"
	prompt := BuildSystemPrompt(conventions, patterns)
	if !strings.Contains(prompt, "Repository Conventions") {
		t.Error("expected conventions section")
	}
	if !strings.Contains(prompt, "Language Patterns") {
		t.Error("expected patterns section")
	}
}

func TestBuildUserPrompt_WithFileContext(t *testing.T) {
	fileContext := "--- main.go ---\npackage main\n"
	prompt := BuildUserPrompt("Fix", "desc", "diff here", fileContext, true, "")
	if !strings.Contains(prompt, "Full File Context") {
		t.Error("expected file context section")
	}
	if !strings.Contains(prompt, "package main") {
		t.Error("expected file content in prompt")
	}
}

func TestBuildUserPrompt_WithoutFileContext(t *testing.T) {
	prompt := BuildUserPrompt("Fix", "desc", "diff here", "", true, "")
	if strings.Contains(prompt, "Full File Context") {
		t.Error("should not include file context section when empty")
	}
}