package service

import (
	"context"
	"encoding/json"
	"fmt"

	"github.com/gochat/gochat/internal/model"
	"github.com/gochat/gochat/internal/repository"
	applogger "github.com/gochat/gochat/pkg/logger"
)

// LinearIntegrationService implements Linear integration business logic.
// Reference: Chatwoot Integrations::LinearController
// Linear integration creates and links issues from conversations.
type LinearIntegrationService struct {
	hookRepo *repository.IntegrationHookRepo
}

// NewLinearIntegrationService creates a new LinearIntegrationService.
func NewLinearIntegrationService(hookRepo *repository.IntegrationHookRepo) *LinearIntegrationService {
	return &LinearIntegrationService{hookRepo: hookRepo}
}

// Delete removes a Linear integration hook for an account.
func (s *LinearIntegrationService) Delete(ctx context.Context, accountID uint) error {
	hooks, err := s.hookRepo.FindByAccountAndType(ctx, accountID, model.HookTypeLinear)
	if err != nil || len(hooks) == 0 {
		return fmt.Errorf("Linear integration not found for account %d", accountID)
	}

	for _, hook := range hooks {
		if err := s.hookRepo.Delete(ctx, hook.ID); err != nil {
			return fmt.Errorf("failed to delete Linear integration: %w", err)
		}
	}

	applogger.L().Infof("Linear integration deleted: account=%d", accountID)
	return nil
}

// GetTeams retrieves available Linear teams (proxy to Linear API).
// GET /api/v1/accounts/:account_id/integrations/linear/teams
func (s *LinearIntegrationService) GetTeams(ctx context.Context, accountID uint) ([]map[string]interface{}, error) {
	hooks, err := s.hookRepo.FindByAccountAndType(ctx, accountID, model.HookTypeLinear)
	if err != nil || len(hooks) == 0 {
		return nil, fmt.Errorf("Linear integration not found for account %d", accountID)
	}

	var settings model.LinearSettings
	if err := json.Unmarshal(hooks[0].Settings, &settings); err != nil {
		return nil, fmt.Errorf("failed to unmarshal Linear settings: %w", err)
	}

	// In production, this would call the Linear API.
	applogger.L().Infof("Listing Linear teams for account=%d", accountID)
	return []map[string]interface{}{
		{"id": settings.TeamID, "name": settings.TeamName},
	}, nil
}

// GetTeamEntities retrieves entities from a Linear team.
// GET /api/v1/accounts/:account_id/integrations/linear/team_entities
func (s *LinearIntegrationService) GetTeamEntities(ctx context.Context, accountID uint) ([]map[string]interface{}, error) {
	hooks, err := s.hookRepo.FindByAccountAndType(ctx, accountID, model.HookTypeLinear)
	if err != nil || len(hooks) == 0 {
		return nil, fmt.Errorf("Linear integration not found for account %d", accountID)
	}

	applogger.L().Infof("Listing Linear team entities for account=%d", accountID)
	return []map[string]interface{}{}, nil
}

// CreateIssueRequest is the DTO for creating a Linear issue.
type CreateIssueRequest struct {
	Title       string `json:"title" validate:"required"`
	Description string `json:"description,omitempty"`
	TeamID      string `json:"team_id,omitempty"`
}

// CreateIssue creates a Linear issue from a conversation.
// POST /api/v1/accounts/:account_id/integrations/linear/create_issue
func (s *LinearIntegrationService) CreateIssue(ctx context.Context, accountID uint, req CreateIssueRequest) (map[string]interface{}, error) {
	hooks, err := s.hookRepo.FindByAccountAndType(ctx, accountID, model.HookTypeLinear)
	if err != nil || len(hooks) == 0 {
		return nil, fmt.Errorf("Linear integration not found for account %d", accountID)
	}

	applogger.L().Infof("Creating Linear issue for account=%d: title=%s", accountID, req.Title)
	// In production, this would call the Linear API to create an issue.
	return map[string]interface{}{
		"status":  "created",
		"title":   req.Title,
		"team_id": req.TeamID,
	}, nil
}

// LinkIssueRequest is the DTO for linking a Linear issue to a conversation.
type LinkIssueRequest struct {
	IssueID        string `json:"issue_id" validate:"required"`
	ConversationID uint   `json:"conversation_id,omitempty"`
}

// LinkIssue links a Linear issue to a conversation.
// POST /api/v1/accounts/:account_id/integrations/linear/link_issue
func (s *LinearIntegrationService) LinkIssue(ctx context.Context, accountID uint, req LinkIssueRequest) (map[string]interface{}, error) {
	hooks, err := s.hookRepo.FindByAccountAndType(ctx, accountID, model.HookTypeLinear)
	if err != nil || len(hooks) == 0 {
		return nil, fmt.Errorf("Linear integration not found for account %d", accountID)
	}

	applogger.L().Infof("Linking Linear issue %s for account=%d", req.IssueID, accountID)
	return map[string]interface{}{
		"status":    "linked",
		"issue_id":  req.IssueID,
	}, nil
}

// UnlinkIssueRequest is the DTO for unlinking a Linear issue from a conversation.
type UnlinkIssueRequest struct {
	IssueID        string `json:"issue_id" validate:"required"`
	ConversationID uint   `json:"conversation_id,omitempty"`
}

// UnlinkIssue unlinks a Linear issue from a conversation.
// POST /api/v1/accounts/:account_id/integrations/linear/unlink_issue
func (s *LinearIntegrationService) UnlinkIssue(ctx context.Context, accountID uint, req UnlinkIssueRequest) (map[string]interface{}, error) {
	hooks, err := s.hookRepo.FindByAccountAndType(ctx, accountID, model.HookTypeLinear)
	if err != nil || len(hooks) == 0 {
		return nil, fmt.Errorf("Linear integration not found for account %d", accountID)
	}

	applogger.L().Infof("Unlinking Linear issue %s for account=%d", req.IssueID, accountID)
	return map[string]interface{}{
		"status":   "unlinked",
		"issue_id": req.IssueID,
	}, nil
}

// SearchIssue searches Linear issues.
// GET /api/v1/accounts/:account_id/integrations/linear/search_issue
func (s *LinearIntegrationService) SearchIssue(ctx context.Context, accountID uint, query string) ([]map[string]interface{}, error) {
	hooks, err := s.hookRepo.FindByAccountAndType(ctx, accountID, model.HookTypeLinear)
	if err != nil || len(hooks) == 0 {
		return nil, fmt.Errorf("Linear integration not found for account %d", accountID)
	}

	applogger.L().Infof("Searching Linear issues for account=%d, query=%s", accountID, query)
	return []map[string]interface{}{}, nil
}

// GetLinkedIssues retrieves Linear issues linked to a conversation.
// GET /api/v1/accounts/:account_id/integrations/linear/linked_issues
func (s *LinearIntegrationService) GetLinkedIssues(ctx context.Context, accountID uint, conversationID uint) ([]map[string]interface{}, error) {
	hooks, err := s.hookRepo.FindByAccountAndType(ctx, accountID, model.HookTypeLinear)
	if err != nil || len(hooks) == 0 {
		return nil, fmt.Errorf("Linear integration not found for account %d", accountID)
	}

	applogger.L().Infof("Listing linked Linear issues for account=%d, conversation=%d", accountID, conversationID)
	return []map[string]interface{}{}, nil
}

// ---- Notion Integration Service ----

// NotionIntegrationService implements Notion integration business logic.
// Reference: Chatwoot Integrations::NotionController
// Notion integration creates notes/pages from conversations.
type NotionIntegrationService struct {
	hookRepo *repository.IntegrationHookRepo
}

// NewNotionIntegrationService creates a new NotionIntegrationService.
func NewNotionIntegrationService(hookRepo *repository.IntegrationHookRepo) *NotionIntegrationService {
	return &NotionIntegrationService{hookRepo: hookRepo}
}

// Delete removes a Notion integration hook for an account.
func (s *NotionIntegrationService) Delete(ctx context.Context, accountID uint) error {
	hooks, err := s.hookRepo.FindByAccountAndType(ctx, accountID, model.HookTypeNotion)
	if err != nil || len(hooks) == 0 {
		return fmt.Errorf("Notion integration not found for account %d", accountID)
	}

	for _, hook := range hooks {
		if err := s.hookRepo.Delete(ctx, hook.ID); err != nil {
			return fmt.Errorf("failed to delete Notion integration: %w", err)
		}
	}

	applogger.L().Infof("Notion integration deleted: account=%d", accountID)
	return nil
}