package v1

// NoteHandler provides HTTP handlers for contact notes.
// Reference: Chatwoot app/controllers/api/v1/accounts/contacts/notes_controller.rb
//
// Routes:
//   GET    /api/v1/accounts/:account_id/contacts/:contact_id/notes         -> List
//   GET    /api/v1/accounts/:account_id/contacts/:contact_id/notes/:id     -> Show
//   POST   /api/v1/accounts/:account_id/contacts/:contact_id/notes         -> Create
//   PUT    /api/v1/accounts/:account_id/contacts/:contact_id/notes/:id     -> Update
//   DELETE /api/v1/accounts/:account_id/contacts/:contact_id/notes/:id     -> Destroy

import (
	"strconv"

	"github.com/gin-gonic/gin"
	"github.com/gochat/gochat/internal/service"
	"github.com/gochat/gochat/pkg/response"
)

// NoteHandler handles HTTP requests for contact notes.
type NoteHandler struct {
	noteService *service.NoteService
}

// NewNoteHandler creates a new NoteHandler.
func NewNoteHandler(noteService *service.NoteService) *NoteHandler {
	return &NoteHandler{noteService: noteService}
}

// noteRequest represents the JSON request body for creating/updating a note.
// Reference: Chatwoot `params.require(:note).permit(:content)`
type noteRequest struct {
	Content string `json:"content" binding:"required"`
}

// List returns all notes for a contact.
// Reference: Chatwoot `def index`
func (h *NoteHandler) List(c *gin.Context) {
	accountID, err := strconv.ParseUint(c.Param("account_id"), 10, 64)
	if err != nil {
		response.AbortWithStatusError(c, 400, response.ErrBadRequest, "Invalid account ID")
		return
	}
	contactID, err := strconv.ParseUint(c.Param("contact_id"), 10, 64)
	if err != nil {
		response.AbortWithStatusError(c, 400, response.ErrBadRequest, "Invalid contact ID")
		return
	}

	notes, err := h.noteService.List(uint(accountID), uint(contactID))
	if err != nil {
		response.AbortWithStatusError(c, 500, response.ErrInternal, "Failed to list notes")
		return
	}
	response.OK(c, notes)
}

// Show returns a single note by ID.
// Reference: Chatwoot `def show; end`
func (h *NoteHandler) Show(c *gin.Context) {
	accountID, err := strconv.ParseUint(c.Param("account_id"), 10, 64)
	if err != nil {
		response.AbortWithStatusError(c, 400, response.ErrBadRequest, "Invalid account ID")
		return
	}
	contactID, err := strconv.ParseUint(c.Param("contact_id"), 10, 64)
	if err != nil {
		response.AbortWithStatusError(c, 400, response.ErrBadRequest, "Invalid contact ID")
		return
	}
	noteID, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		response.AbortWithStatusError(c, 400, response.ErrBadRequest, "Invalid note ID")
		return
	}

	note, err := h.noteService.Get(uint(accountID), uint(contactID), uint(noteID))
	if err != nil {
		response.AbortWithStatusError(c, 404, response.ErrNotFound, "Note not found")
		return
	}
	response.OK(c, note)
}

// Create creates a new note for a contact.
// Reference: Chatwoot `def create`
//   @note = @contact.notes.create!(note_params)
//   note_params merges {contact_id: @contact.id, user_id: Current.user.id}
func (h *NoteHandler) Create(c *gin.Context) {
	accountID, err := strconv.ParseUint(c.Param("account_id"), 10, 64)
	if err != nil {
		response.AbortWithStatusError(c, 400, response.ErrBadRequest, "Invalid account ID")
		return
	}
	contactID, err := strconv.ParseUint(c.Param("contact_id"), 10, 64)
	if err != nil {
		response.AbortWithStatusError(c, 400, response.ErrBadRequest, "Invalid contact ID")
		return
	}

	// Chatwoot: params.require(:note) → {"note": {"content": "..."}}
	var wrapper struct {
		Note noteRequest `json:"note"`
	}
	if err := c.ShouldBindJSON(&wrapper); err != nil {
		response.AbortWithStatusError(c, 400, response.ErrBadRequest, "Content is required")
		return
	}
	req := wrapper.Note
	userID, exists := c.Get("user_id")
	if !exists {
		response.AbortWithStatusError(c, 401, response.ErrUnauthorized, "User not authenticated")
		return
	}

	note, err := h.noteService.Create(uint(accountID), uint(contactID), userID.(uint), req.Content)
	if err != nil {
		if err == service.ErrNoteContentEmpty {
			response.AbortWithStatusError(c, 400, response.ErrBadRequest, "Content is required")
			return
		}
		response.AbortWithStatusError(c, 500, response.ErrInternal, "Failed to create note")
		return
	}
	response.Created(c, note)
}

// Update updates an existing note's content.
// Reference: Chatwoot `def update; @note.update(note_params); end`
func (h *NoteHandler) Update(c *gin.Context) {
	accountID, err := strconv.ParseUint(c.Param("account_id"), 10, 64)
	if err != nil {
		response.AbortWithStatusError(c, 400, response.ErrBadRequest, "Invalid account ID")
		return
	}
	contactID, err := strconv.ParseUint(c.Param("contact_id"), 10, 64)
	if err != nil {
		response.AbortWithStatusError(c, 400, response.ErrBadRequest, "Invalid contact ID")
		return
	}
	noteID, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		response.AbortWithStatusError(c, 400, response.ErrBadRequest, "Invalid note ID")
		return
	}

	// Chatwoot: params.require(:note) → {"note": {"content": "..."}}
	var wrapper struct {
		Note noteRequest `json:"note"`
	}
	if err := c.ShouldBindJSON(&wrapper); err != nil {
		response.AbortWithStatusError(c, 400, response.ErrBadRequest, "Content is required")
		return
	}
	req := wrapper.Note

	note, err := h.noteService.Update(uint(accountID), uint(contactID), uint(noteID), req.Content)
	if err != nil {
		if err == service.ErrNoteNotFound {
			response.AbortWithStatusError(c, 404, response.ErrNotFound, "Note not found")
			return
		}
		response.AbortWithStatusError(c, 500, response.ErrInternal, "Failed to update note")
		return
	}
	response.OK(c, note)
}

// Destroy deletes a note.
// Reference: Chatwoot `def destroy; @note.destroy!; head :ok; end`
// Chatwoot returns 200 OK on destroy, NOT 204 NoContent.
func (h *NoteHandler) Destroy(c *gin.Context) {
	accountID, err := strconv.ParseUint(c.Param("account_id"), 10, 64)
	if err != nil {
		response.AbortWithStatusError(c, 400, response.ErrBadRequest, "Invalid account ID")
		return
	}
	contactID, err := strconv.ParseUint(c.Param("contact_id"), 10, 64)
	if err != nil {
		response.AbortWithStatusError(c, 400, response.ErrBadRequest, "Invalid contact ID")
		return
	}
	noteID, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		response.AbortWithStatusError(c, 400, response.ErrBadRequest, "Invalid note ID")
		return
	}

	err = h.noteService.Delete(uint(accountID), uint(contactID), uint(noteID))
	if err != nil {
		response.AbortWithStatusError(c, 404, response.ErrNotFound, "Note not found")
		return
	}
	// Reference: Chatwoot returns `head :ok` → 200 OK with empty body
	response.OK(c, gin.H{})
}