package review

import (
	"fmt"
	"strings"
)

// BuildPersonaSystemPrompt constructs a system prompt from a persona definition.
// This replaces BuildSystemBase when a persona is provided.
func BuildPersonaSystemPrompt(p *Persona) string {
	var sb strings.Builder

	// Identity section
	sb.WriteString(p.Identity)
	sb.WriteString("\n\n")

	// Focus section
	if len(p.Focus) > 0 {
		sb.WriteString("## Focus Areas\n\n")
		sb.WriteString("Concentrate your review on:\n")
		for _, f := range p.Focus {
			sb.WriteString(fmt.Sprintf("- %s\n", f))
		}
		sb.WriteString("\n")
	}

	// Ignore section
	if len(p.Ignore) > 0 {
		sb.WriteString("## Explicitly Out of Scope\n\n")
		sb.WriteString("Do NOT comment on:\n")
		for _, i := range p.Ignore {
			sb.WriteString(fmt.Sprintf("- %s\n", i))
		}
		sb.WriteString("\n")
	}

	// Severity calibration
	if p.Severity.Major != "" || p.Severity.Minor != "" || p.Severity.Nit != "" {
		sb.WriteString("## Severity Calibration\n\n")
		sb.WriteString("Use these severity definitions for YOUR domain:\n")
		if p.Severity.Major != "" {
			sb.WriteString(fmt.Sprintf("- **MAJOR**: %s\n", p.Severity.Major))
		}
		if p.Severity.Minor != "" {
			sb.WriteString(fmt.Sprintf("- **MINOR**: %s\n", p.Severity.Minor))
		}
		if p.Severity.Nit != "" {
			sb.WriteString(fmt.Sprintf("- **NIT**: %s\n", p.Severity.Nit))
		}
		sb.WriteString("\n")
	}

	// Output format instructions (shared schema from prompt.go)
	sb.WriteString("## Review Instructions\n\n")
	sb.WriteString("CONTEXT:\n")
	sb.WriteString("- You will receive the full content of modified files for reference, followed by the diff showing what changed.\n")
	sb.WriteString("- The diff shows ONLY what was added/removed. The full file content provides complete context.\n")
	sb.WriteString("- Focus your review on the CHANGES (the diff), using the full files for context.\n\n")
	sb.WriteString("Your task:\n")
	sb.WriteString("1. Review the diff for issues within YOUR focus areas only.\n")
	sb.WriteString("2. Consider the CI status — if CI has failed, that is an automatic REQUEST_CHANGES regardless of code quality.\n")
	sb.WriteString("3. Output your review as structured JSON (and ONLY JSON, no markdown fences or other text).\n\n")
	sb.WriteString("Output format:\n")
	sb.WriteString(outputSchemaJSON)
	sb.WriteString("\n\n")
	sb.WriteString(verdictRules)
	sb.WriteString("\n- Only report findings within your focus areas. Ignore everything else.\n")
	sb.WriteString("- Line numbers should reference the new file line numbers from the diff headers.\n")
	sb.WriteString("- If the diff has no changes relevant to your focus areas, APPROVE with no findings.\n")

	// Custom output format if provided
	if p.OutputFormat != "" {
		sb.WriteString("\n\n## Additional Output Guidelines\n\n")
		sb.WriteString(p.OutputFormat)
	}

	return sb.String()
}

// BuildSystemPromptWithPersona constructs the full system prompt, using either
// a persona or the default generic prompt. This is a convenience wrapper that
// combines BuildPersonaSystemPrompt (or BuildSystemBase) with patterns and conventions.
// It is exported for use by callers who want one-shot prompt assembly.
func BuildSystemPromptWithPersona(persona *Persona, conventions, patterns string) string {
	var base string
	if persona != nil {
		base = BuildPersonaSystemPrompt(persona)
	} else {
		base = BuildSystemBase()
	}

	var sb strings.Builder
	sb.WriteString(base)

	if patterns != "" {
		sb.WriteString(fmt.Sprintf("\n\n## Language Patterns & Idioms\n\nUse the following patterns as review criteria. Code that violates these established patterns is a finding:\n\n%s\n", patterns))
	}

	if conventions != "" {
		sb.WriteString(fmt.Sprintf("\n\n## Repository Conventions\n\nThe repository has the following coding conventions that must be respected:\n\n%s\n", conventions))
	}

	return sb.String()
}