package v1

import (
	"net/http"
	"strconv"

	"github.com/gin-gonic/gin"

	"github.com/gochat/gochat/internal/search"
	"github.com/gochat/gochat/internal/service"
	applogger "github.com/gochat/gochat/pkg/logger"
	"github.com/gochat/gochat/pkg/pagination"
	"github.com/gochat/gochat/pkg/response"
)

// CompanyHandler handles Company CRUD + search + nested contacts/conversations/notes.
// Reference: Chatwoot app/controllers/api/v1/companies_controller.rb
type CompanyHandler struct {
	svc *service.CompanyService
}

// NewCompanyHandler creates a new CompanyHandler.
func NewCompanyHandler(svc *service.CompanyService) *CompanyHandler {
	return &CompanyHandler{svc: svc}
}

// List retrieves all companies for an account.
// GET /api/v1/accounts/:id/companies?sort=name&page=1&per_page=25
func (h *CompanyHandler) List(c *gin.Context) {
	accountID := getAccountID(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusUnauthorized, response.ErrUnauthorized, "account not identified")
		return
	}

	pg := pagination.Parse(c)
	sort := c.DefaultQuery("sort", "")

	companies, total, err := h.svc.List(c.Request.Context(), accountID, pg.Offset, pg.PerPage, sort)
	if err != nil {
		applogger.L().Errorf("List companies for account %d: %v", accountID, err)
		handleServiceError(c, err)
		return
	}

	response.OKWithMeta(c, companies, pg.Page, pg.PerPage, total)
}

// Search searches companies by query.
// GET /api/v1/accounts/:id/companies/search?q=Acme&sort=name&page=1&per_page=25
func (h *CompanyHandler) Search(c *gin.Context) {
	accountID := getAccountID(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusUnauthorized, response.ErrUnauthorized, "account not identified")
		return
	}

	pg := pagination.Parse(c)
	query := c.DefaultQuery("q", "")
	sort := c.DefaultQuery("sort", "")
	searchMode := search.SearchMode(c.DefaultQuery("search_mode", "ilike"))

	companies, total, err := h.svc.Search(c.Request.Context(), accountID, query, pg.Offset, pg.PerPage, sort, searchMode)
	if err != nil {
		applogger.L().Errorf("Search companies for account %d: %v", accountID, err)
		handleServiceError(c, err)
		return
	}

	response.OKWithMeta(c, companies, pg.Page, pg.PerPage, total)
}

// Get retrieves a single company by ID.
// GET /api/v1/accounts/:id/companies/:company_id
func (h *CompanyHandler) Get(c *gin.Context) {
	accountID := getAccountID(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusUnauthorized, response.ErrUnauthorized, "account not identified")
		return
	}

	companyID, err := strconv.ParseUint(c.Param("company_id"), 10, 32)
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid company id")
		return
	}

	company, svcErr := h.svc.Get(c.Request.Context(), uint(companyID), accountID)
	if svcErr != nil {
		handleServiceError(c, svcErr)
		return
	}

	response.OK(c, company)
}

// Create creates a new company.
// POST /api/v1/accounts/:id/companies
func (h *CompanyHandler) Create(c *gin.Context) {
	accountID := getAccountID(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusUnauthorized, response.ErrUnauthorized, "account not identified")
		return
	}

	var req service.CreateCompanyRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, err.Error())
		return
	}

	company, svcErr := h.svc.Create(c.Request.Context(), accountID, &req)
	if svcErr != nil {
		handleServiceError(c, svcErr)
		return
	}

	response.Created(c, company)
}

// Update updates an existing company.
// PUT /api/v1/accounts/:id/companies/:company_id
func (h *CompanyHandler) Update(c *gin.Context) {
	accountID := getAccountID(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusUnauthorized, response.ErrUnauthorized, "account not identified")
		return
	}

	companyID, err := strconv.ParseUint(c.Param("company_id"), 10, 32)
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid company id")
		return
	}

	var req service.UpdateCompanyRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, err.Error())
		return
	}

	company, svcErr := h.svc.Update(c.Request.Context(), uint(companyID), accountID, &req)
	if svcErr != nil {
		handleServiceError(c, svcErr)
		return
	}

	response.OK(c, company)
}

// Delete deletes a company.
// DELETE /api/v1/accounts/:id/companies/:company_id
func (h *CompanyHandler) Delete(c *gin.Context) {
	accountID := getAccountID(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusUnauthorized, response.ErrUnauthorized, "account not identified")
		return
	}

	companyID, err := strconv.ParseUint(c.Param("company_id"), 10, 32)
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid company id")
		return
	}

	if svcErr := h.svc.Delete(c.Request.Context(), uint(companyID), accountID); svcErr != nil {
		handleServiceError(c, svcErr)
		return
	}

	response.NoContent(c)
}

// ListContacts retrieves contacts associated with a company.
// GET /api/v1/accounts/:id/companies/:company_id/contacts?page=1&per_page=25
func (h *CompanyHandler) ListContacts(c *gin.Context) {
	accountID := getAccountID(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusUnauthorized, response.ErrUnauthorized, "account not identified")
		return
	}

	companyID, err := strconv.ParseUint(c.Param("company_id"), 10, 32)
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid company id")
		return
	}

	pg := pagination.Parse(c)

	contacts, total, svcErr := h.svc.ListContacts(c.Request.Context(), uint(companyID), accountID, pg.Offset, pg.PerPage)
	if svcErr != nil {
		handleServiceError(c, svcErr)
		return
	}

	response.OKWithMeta(c, contacts, pg.Page, pg.PerPage, total)
}

// ListConversations retrieves conversations for contacts of a company.
// GET /api/v1/accounts/:id/companies/:company_id/conversations?page=1&per_page=25
func (h *CompanyHandler) ListConversations(c *gin.Context) {
	accountID := getAccountID(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusUnauthorized, response.ErrUnauthorized, "account not identified")
		return
	}

	companyID, err := strconv.ParseUint(c.Param("company_id"), 10, 32)
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid company id")
		return
	}

	pg := pagination.Parse(c)

	conversations, total, svcErr := h.svc.ListConversations(c.Request.Context(), uint(companyID), accountID, pg.Offset, pg.PerPage)
	if svcErr != nil {
		handleServiceError(c, svcErr)
		return
	}

	response.OKWithMeta(c, conversations, pg.Page, pg.PerPage, total)
}

// ListNotes retrieves notes for a company.
// GET /api/v1/accounts/:id/companies/:company_id/notes?page=1&per_page=25
func (h *CompanyHandler) ListNotes(c *gin.Context) {
	accountID := getAccountID(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusUnauthorized, response.ErrUnauthorized, "account not identified")
		return
	}

	companyID, err := strconv.ParseUint(c.Param("company_id"), 10, 32)
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid company id")
		return
	}

	pg := pagination.Parse(c)

	notes, total, svcErr := h.svc.ListNotes(c.Request.Context(), uint(companyID), accountID, pg.Offset, pg.PerPage)
	if svcErr != nil {
		handleServiceError(c, svcErr)
		return
	}

	response.OKWithMeta(c, notes, pg.Page, pg.PerPage, total)
}

// CreateNote creates a note for a company.
// POST /api/v1/accounts/:id/companies/:company_id/notes
func (h *CompanyHandler) CreateNote(c *gin.Context) {
	accountID := getAccountID(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusUnauthorized, response.ErrUnauthorized, "account not identified")
		return
	}

	companyID, err := strconv.ParseUint(c.Param("company_id"), 10, 32)
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid company id")
		return
	}

	userID := getUserID(c)
	if userID == 0 {
		response.AbortWithStatusError(c, http.StatusUnauthorized, response.ErrUnauthorized, "user not identified")
		return
	}

	var req service.CreateCompanyNoteRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, err.Error())
		return
	}

	note, svcErr := h.svc.CreateNote(c.Request.Context(), uint(companyID), accountID, userID, &req)
	if svcErr != nil {
		handleServiceError(c, svcErr)
		return
	}

	response.Created(c, note)
}

// DeleteNote deletes a note from a company.
// DELETE /api/v1/accounts/:id/companies/:company_id/notes/:note_id
func (h *CompanyHandler) DeleteNote(c *gin.Context) {
	accountID := getAccountID(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusUnauthorized, response.ErrUnauthorized, "account not identified")
		return
	}

	companyID, err := strconv.ParseUint(c.Param("company_id"), 10, 32)
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid company id")
		return
	}

	noteID, err := strconv.ParseUint(c.Param("note_id"), 10, 32)
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid note id")
		return
	}

	if err := h.svc.DeleteNote(c.Request.Context(), uint(noteID), uint(companyID), accountID); err != nil {
		handleServiceError(c, err)
		return
	}

	response.OK(c, gin.H{"message": "note deleted"})
}

// AddContact adds a contact to a company.
// POST /api/v1/accounts/:id/companies/:company_id/contacts/:contact_id
func (h *CompanyHandler) AddContact(c *gin.Context) {
	accountID := getAccountID(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusUnauthorized, response.ErrUnauthorized, "account not identified")
		return
	}

	companyID, err := strconv.ParseUint(c.Param("company_id"), 10, 32)
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid company id")
		return
	}

	contactID, err := strconv.ParseUint(c.Param("contact_id"), 10, 32)
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid contact id")
		return
	}

	if err := h.svc.AddContact(c.Request.Context(), uint(companyID), accountID, uint(contactID)); err != nil {
		handleServiceError(c, err)
		return
	}

	response.OK(c, gin.H{"message": "contact added"})
}

// RemoveContact removes a contact from a company.
// DELETE /api/v1/accounts/:id/companies/:company_id/contacts/:contact_id
func (h *CompanyHandler) RemoveContact(c *gin.Context) {
	accountID := getAccountID(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusUnauthorized, response.ErrUnauthorized, "account not identified")
		return
	}

	companyID, err := strconv.ParseUint(c.Param("company_id"), 10, 32)
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid company id")
		return
	}

	contactID, err := strconv.ParseUint(c.Param("contact_id"), 10, 32)
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid contact id")
		return
	}

	if err := h.svc.RemoveContact(c.Request.Context(), uint(companyID), accountID, uint(contactID)); err != nil {
		handleServiceError(c, err)
		return
	}

	response.OK(c, gin.H{"message": "contact removed"})
}