package main

import (
	"encoding/json"
	"fmt"
	"html"
	"strings"
)

// FragmentUserMessage returns an HTML fragment for a user message.
func FragmentUserMessage(text string) string {
	escaped := html.EscapeString(text)
	return fmt.Sprintf(`<div id="chat-messages" hx-swap-oob="beforeend"><div class="message message-user">%s</div></div>`, escaped)
}

// FragmentAssistantStart returns the opening tag for an assistant message with streaming.
func FragmentAssistantStart(msgID string) string {
	return fmt.Sprintf(`<div id="chat-messages" hx-swap-oob="beforeend"><div class="message message-assistant" id="%s"><div class="content"></div></div></div>`, msgID)
}

// FragmentAssistantChunk appends text to an existing assistant message.
func FragmentAssistantChunk(msgID, textChunk string) string {
	escaped := html.EscapeString(textChunk)
	return fmt.Sprintf(`<div id="%s" hx-swap-oob="beforeend:.content">%s</div>`, msgID, escaped)
}

// FragmentAssistantComplete replaces the content of an assistant message with final rendered content.
func FragmentAssistantComplete(msgID, htmlContent string) string {
	return fmt.Sprintf(`<div id="%s" hx-swap-oob="innerHTML:.content">%s</div>`, msgID, htmlContent)
}

// FragmentToolCall returns an HTML fragment for a tool use notification.
func FragmentToolCall(toolName string, toolInput string) string {
	escapedName := html.EscapeString(toolName)
	summary := formatToolSummary(toolName, toolInput)
	return fmt.Sprintf(`<div id="chat-messages" hx-swap-oob="beforeend"><div class="message message-tool"><div class="tool-name">%s</div><div>%s</div></div></div>`, escapedName, summary)
}

// formatToolSummary produces a human-readable summary of a tool call.
func formatToolSummary(toolName, rawInput string) string {
	var inputMap map[string]any
	if err := json.Unmarshal([]byte(rawInput), &inputMap); err != nil {
		// Not JSON, just escape and truncate
		s := html.EscapeString(rawInput)
		if len(s) > 200 {
			s = s[:200] + "..."
		}
		return s
	}

	switch toolName {
	case "Read":
		if fp, ok := inputMap["file_path"].(string); ok {
			return html.EscapeString(fp)
		}
	case "Edit":
		if fp, ok := inputMap["file_path"].(string); ok {
			return html.EscapeString(fmt.Sprintf("%s", fp))
		}
	case "Write":
		if fp, ok := inputMap["file_path"].(string); ok {
			return html.EscapeString(fp)
		}
	case "Bash":
		if cmd, ok := inputMap["command"].(string); ok {
			s := cmd
			if len(s) > 150 {
				s = s[:150] + "..."
			}
			return "<code>" + html.EscapeString(s) + "</code>"
		}
	case "Glob":
		if pat, ok := inputMap["pattern"].(string); ok {
			return html.EscapeString(pat)
		}
	case "Grep":
		parts := []string{}
		if pat, ok := inputMap["pattern"].(string); ok {
			parts = append(parts, pat)
		}
		if p, ok := inputMap["path"].(string); ok {
			parts = append(parts, "in "+p)
		}
		if len(parts) > 0 {
			return html.EscapeString(strings.Join(parts, " "))
		}
	case "WebSearch":
		if q, ok := inputMap["query"].(string); ok {
			return html.EscapeString(q)
		}
	case "WebFetch":
		if u, ok := inputMap["url"].(string); ok {
			return html.EscapeString(u)
		}
	}

	// Fallback: show key=value pairs
	var parts []string
	for k, v := range inputMap {
		s := fmt.Sprintf("%v", v)
		if len(s) > 80 {
			s = s[:80] + "..."
		}
		parts = append(parts, html.EscapeString(fmt.Sprintf("%s: %s", k, s)))
	}
	result := strings.Join(parts, ", ")
	if len(result) > 300 {
		result = result[:300] + "..."
	}
	return result
}

// FragmentSystemMessage returns an HTML fragment for a system message.
func FragmentSystemMessage(text string) string {
	escaped := html.EscapeString(text)
	return fmt.Sprintf(`<div id="chat-messages" hx-swap-oob="beforeend"><div class="message message-system">%s</div></div>`, escaped)
}

// FragmentTypingIndicator shows or hides the typing indicator.
func FragmentTypingIndicator(show bool) string {
	if show {
		return `<div id="typing-indicator" hx-swap-oob="innerHTML"><span class="typing-indicator">Claude razmišlja<span class="dots">...</span></span></div>`
	}
	return `<div id="typing-indicator" hx-swap-oob="innerHTML"></div>`
}

// FragmentStatus updates the connection status indicator.
func FragmentStatus(connected bool) string {
	if connected {
		return `<span id="ws-status" hx-swap-oob="innerHTML" class="status connected">Povezan</span>`
	}
	return `<span id="ws-status" hx-swap-oob="innerHTML" class="status">Nepovezan</span>`
}

// FragmentClearInput clears the message input field.
func FragmentClearInput() string {
	return `<textarea id="message-input" hx-swap-oob="outerHTML" name="message" class="chat-input" placeholder="Pošalji poruku..." rows="1"></textarea>`
}

// FragmentCombine joins multiple fragments into a single response.
func FragmentCombine(fragments ...string) string {
	return strings.Join(fragments, "\n")
}