package handlers

import (
	"net/http"
	"time"

	"github.com/gin-gonic/gin"
	"github.com/google/uuid"

	"github.com/breakpilot/edu-search-service/internal/database"
)

// AIExtractionHandlers handles AI-based profile extraction endpoints
// These endpoints are designed for vast.ai or similar AI services to:
// 1. Get profile URLs that need extraction
// 2. Submit extracted data back
type AIExtractionHandlers struct {
	repo *database.Repository
}

// NewAIExtractionHandlers creates new AI extraction handlers
func NewAIExtractionHandlers(repo *database.Repository) *AIExtractionHandlers {
	return &AIExtractionHandlers{repo: repo}
}

// ProfileExtractionTask represents a profile URL to be processed by AI
type ProfileExtractionTask struct {
	StaffID       uuid.UUID `json:"staff_id"`
	ProfileURL    string    `json:"profile_url"`
	UniversityID  uuid.UUID `json:"university_id"`
	UniversityURL string    `json:"university_url,omitempty"`
	FullName      string    `json:"full_name,omitempty"`
	CurrentData   struct {
		Email      string `json:"email,omitempty"`
		Phone      string `json:"phone,omitempty"`
		Office     string `json:"office,omitempty"`
		Position   string `json:"position,omitempty"`
		Department string `json:"department,omitempty"`
	} `json:"current_data"`
}

// GetPendingProfiles returns staff profiles that need AI extraction
// GET /api/v1/ai/extraction/pending?limit=10&university_id=...
func (h *AIExtractionHandlers) GetPendingProfiles(c *gin.Context) {
	limit := parseIntDefault(c.Query("limit"), 10)
	if limit > 100 {
		limit = 100
	}

	var universityID *uuid.UUID
	if uniIDStr := c.Query("university_id"); uniIDStr != "" {
		id, err := uuid.Parse(uniIDStr)
		if err == nil {
			universityID = &id
		}
	}

	// Get staff that have profile URLs but missing key data
	params := database.StaffSearchParams{
		UniversityID: universityID,
		Limit:        limit * 2, // Get more to filter
	}

	result, err := h.repo.SearchStaff(c.Request.Context(), params)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	// Filter to only include profiles that need extraction
	var tasks []ProfileExtractionTask
	for _, staff := range result.Staff {
		// Skip if no profile URL
		if staff.ProfileURL == nil || *staff.ProfileURL == "" {
			continue
		}

		// Include if missing email or other important data
		needsExtraction := staff.Email == nil || *staff.Email == ""

		if needsExtraction {
			task := ProfileExtractionTask{
				StaffID:      staff.ID,
				ProfileURL:   *staff.ProfileURL,
				UniversityID: staff.UniversityID,
			}

			if staff.FullName != nil {
				task.FullName = *staff.FullName
			}
			if staff.Email != nil {
				task.CurrentData.Email = *staff.Email
			}
			if staff.Phone != nil {
				task.CurrentData.Phone = *staff.Phone
			}
			if staff.Office != nil {
				task.CurrentData.Office = *staff.Office
			}
			if staff.Position != nil {
				task.CurrentData.Position = *staff.Position
			}
			if staff.DepartmentName != nil {
				task.CurrentData.Department = *staff.DepartmentName
			}

			tasks = append(tasks, task)
			if len(tasks) >= limit {
				break
			}
		}
	}

	c.JSON(http.StatusOK, gin.H{
		"tasks": tasks,
		"total": len(tasks),
	})
}

// ExtractedProfileData represents data extracted by AI from a profile page
type ExtractedProfileData struct {
	StaffID uuid.UUID `json:"staff_id" binding:"required"`

	// Contact info
	Email string `json:"email,omitempty"`
	Phone string `json:"phone,omitempty"`
	Office string `json:"office,omitempty"`

	// Professional info
	Position       string `json:"position,omitempty"`
	PositionType   string `json:"position_type,omitempty"` // professor, researcher, phd_student, staff
	AcademicTitle  string `json:"academic_title,omitempty"`
	IsProfessor    *bool  `json:"is_professor,omitempty"`
	DepartmentName string `json:"department_name,omitempty"`

	// Hierarchy
	SupervisorName string `json:"supervisor_name,omitempty"`
	TeamRole       string `json:"team_role,omitempty"` // leitung, mitarbeiter, sekretariat, hiwi, doktorand

	// Research
	ResearchInterests []string `json:"research_interests,omitempty"`
	ResearchSummary   string   `json:"research_summary,omitempty"`

	// Teaching (Lehrveranstaltungen)
	TeachingTopics []string `json:"teaching_topics,omitempty"`

	// External profiles
	ORCID           string `json:"orcid,omitempty"`
	GoogleScholarID string `json:"google_scholar_id,omitempty"`
	ResearchgateURL string `json:"researchgate_url,omitempty"`
	LinkedInURL     string `json:"linkedin_url,omitempty"`
	PersonalWebsite string `json:"personal_website,omitempty"`
	PhotoURL        string `json:"photo_url,omitempty"`

	// Institute/Department links discovered
	InstituteURL  string `json:"institute_url,omitempty"`
	InstituteName string `json:"institute_name,omitempty"`

	// Confidence score (0-1)
	Confidence float64 `json:"confidence,omitempty"`
}

// SubmitExtractedData saves AI-extracted profile data
// POST /api/v1/ai/extraction/submit
func (h *AIExtractionHandlers) SubmitExtractedData(c *gin.Context) {
	var data ExtractedProfileData
	if err := c.ShouldBindJSON(&data); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid request: " + err.Error()})
		return
	}

	// Get existing staff record
	staff, err := h.repo.GetStaff(c.Request.Context(), data.StaffID)
	if err != nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "Staff not found"})
		return
	}

	// Update fields if provided and not empty
	updated := false

	if data.Email != "" && (staff.Email == nil || *staff.Email == "") {
		staff.Email = &data.Email
		updated = true
	}
	if data.Phone != "" && (staff.Phone == nil || *staff.Phone == "") {
		staff.Phone = &data.Phone
		updated = true
	}
	if data.Office != "" && (staff.Office == nil || *staff.Office == "") {
		staff.Office = &data.Office
		updated = true
	}
	if data.Position != "" && (staff.Position == nil || *staff.Position == "") {
		staff.Position = &data.Position
		updated = true
	}
	if data.PositionType != "" && (staff.PositionType == nil || *staff.PositionType == "") {
		staff.PositionType = &data.PositionType
		updated = true
	}
	if data.AcademicTitle != "" && (staff.AcademicTitle == nil || *staff.AcademicTitle == "") {
		staff.AcademicTitle = &data.AcademicTitle
		updated = true
	}
	if data.IsProfessor != nil {
		staff.IsProfessor = *data.IsProfessor
		updated = true
	}
	if data.TeamRole != "" && (staff.TeamRole == nil || *staff.TeamRole == "") {
		staff.TeamRole = &data.TeamRole
		updated = true
	}
	if len(data.ResearchInterests) > 0 && len(staff.ResearchInterests) == 0 {
		staff.ResearchInterests = data.ResearchInterests
		updated = true
	}
	if data.ResearchSummary != "" && (staff.ResearchSummary == nil || *staff.ResearchSummary == "") {
		staff.ResearchSummary = &data.ResearchSummary
		updated = true
	}
	if data.ORCID != "" && (staff.ORCID == nil || *staff.ORCID == "") {
		staff.ORCID = &data.ORCID
		updated = true
	}
	if data.GoogleScholarID != "" && (staff.GoogleScholarID == nil || *staff.GoogleScholarID == "") {
		staff.GoogleScholarID = &data.GoogleScholarID
		updated = true
	}
	if data.ResearchgateURL != "" && (staff.ResearchgateURL == nil || *staff.ResearchgateURL == "") {
		staff.ResearchgateURL = &data.ResearchgateURL
		updated = true
	}
	if data.LinkedInURL != "" && (staff.LinkedInURL == nil || *staff.LinkedInURL == "") {
		staff.LinkedInURL = &data.LinkedInURL
		updated = true
	}
	if data.PersonalWebsite != "" && (staff.PersonalWebsite == nil || *staff.PersonalWebsite == "") {
		staff.PersonalWebsite = &data.PersonalWebsite
		updated = true
	}
	if data.PhotoURL != "" && (staff.PhotoURL == nil || *staff.PhotoURL == "") {
		staff.PhotoURL = &data.PhotoURL
		updated = true
	}

	// Try to resolve supervisor by name
	if data.SupervisorName != "" && staff.SupervisorID == nil {
		// Search for supervisor in same university
		supervisorParams := database.StaffSearchParams{
			Query:        data.SupervisorName,
			UniversityID: &staff.UniversityID,
			Limit:        1,
		}
		result, err := h.repo.SearchStaff(c.Request.Context(), supervisorParams)
		if err == nil && len(result.Staff) > 0 {
			staff.SupervisorID = &result.Staff[0].ID
			updated = true
		}
	}

	// Update last verified timestamp
	now := time.Now()
	staff.LastVerified = &now

	if updated {
		err = h.repo.CreateStaff(c.Request.Context(), staff)
		if err != nil {
			c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to update: " + err.Error()})
			return
		}
	}

	c.JSON(http.StatusOK, gin.H{
		"status":   "success",
		"updated":  updated,
		"staff_id": staff.ID,
	})
}

// SubmitBatchExtractedData saves multiple AI-extracted profile data items
// POST /api/v1/ai/extraction/submit-batch
func (h *AIExtractionHandlers) SubmitBatchExtractedData(c *gin.Context) {
	var batch struct {
		Items []ExtractedProfileData `json:"items" binding:"required"`
	}

	if err := c.ShouldBindJSON(&batch); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid request: " + err.Error()})
		return
	}

	results := make([]gin.H, 0, len(batch.Items))
	successCount := 0
	errorCount := 0

	for _, item := range batch.Items {
		// Get existing staff record
		staff, err := h.repo.GetStaff(c.Request.Context(), item.StaffID)
		if err != nil {
			results = append(results, gin.H{
				"staff_id": item.StaffID,
				"status":   "error",
				"error":    "Staff not found",
			})
			errorCount++
			continue
		}

		// Apply updates (same logic as single submit)
		updated := false

		if item.Email != "" && (staff.Email == nil || *staff.Email == "") {
			staff.Email = &item.Email
			updated = true
		}
		if item.Phone != "" && (staff.Phone == nil || *staff.Phone == "") {
			staff.Phone = &item.Phone
			updated = true
		}
		if item.Office != "" && (staff.Office == nil || *staff.Office == "") {
			staff.Office = &item.Office
			updated = true
		}
		if item.Position != "" && (staff.Position == nil || *staff.Position == "") {
			staff.Position = &item.Position
			updated = true
		}
		if item.PositionType != "" && (staff.PositionType == nil || *staff.PositionType == "") {
			staff.PositionType = &item.PositionType
			updated = true
		}
		if item.TeamRole != "" && (staff.TeamRole == nil || *staff.TeamRole == "") {
			staff.TeamRole = &item.TeamRole
			updated = true
		}
		if len(item.ResearchInterests) > 0 && len(staff.ResearchInterests) == 0 {
			staff.ResearchInterests = item.ResearchInterests
			updated = true
		}
		if item.ORCID != "" && (staff.ORCID == nil || *staff.ORCID == "") {
			staff.ORCID = &item.ORCID
			updated = true
		}

		// Update last verified
		now := time.Now()
		staff.LastVerified = &now

		if updated {
			err = h.repo.CreateStaff(c.Request.Context(), staff)
			if err != nil {
				results = append(results, gin.H{
					"staff_id": item.StaffID,
					"status":   "error",
					"error":    err.Error(),
				})
				errorCount++
				continue
			}
		}

		results = append(results, gin.H{
			"staff_id": item.StaffID,
			"status":   "success",
			"updated":  updated,
		})
		successCount++
	}

	c.JSON(http.StatusOK, gin.H{
		"results":       results,
		"success_count": successCount,
		"error_count":   errorCount,
		"total":         len(batch.Items),
	})
}

// InstituteHierarchyTask represents an institute page to crawl for hierarchy
type InstituteHierarchyTask struct {
	InstituteURL  string    `json:"institute_url"`
	InstituteName string    `json:"institute_name,omitempty"`
	UniversityID  uuid.UUID `json:"university_id"`
}

// GetInstitutePages returns institute pages that need hierarchy crawling
// GET /api/v1/ai/extraction/institutes?university_id=...
func (h *AIExtractionHandlers) GetInstitutePages(c *gin.Context) {
	var universityID *uuid.UUID
	if uniIDStr := c.Query("university_id"); uniIDStr != "" {
		id, err := uuid.Parse(uniIDStr)
		if err == nil {
			universityID = &id
		}
	}

	// Get unique institute/department URLs from staff profiles
	params := database.StaffSearchParams{
		UniversityID: universityID,
		Limit:        1000,
	}

	result, err := h.repo.SearchStaff(c.Request.Context(), params)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	// Collect unique source URLs (these are typically department pages)
	urlSet := make(map[string]bool)
	var tasks []InstituteHierarchyTask

	for _, staff := range result.Staff {
		if staff.SourceURL != nil && *staff.SourceURL != "" {
			url := *staff.SourceURL
			if !urlSet[url] {
				urlSet[url] = true
				tasks = append(tasks, InstituteHierarchyTask{
					InstituteURL: url,
					UniversityID: staff.UniversityID,
				})
			}
		}
	}

	c.JSON(http.StatusOK, gin.H{
		"institutes": tasks,
		"total":      len(tasks),
	})
}

// InstituteHierarchyData represents hierarchy data extracted from an institute page
type InstituteHierarchyData struct {
	InstituteURL  string    `json:"institute_url" binding:"required"`
	UniversityID  uuid.UUID `json:"university_id" binding:"required"`
	InstituteName string    `json:"institute_name,omitempty"`

	// Leadership
	LeaderName  string `json:"leader_name,omitempty"`
	LeaderTitle string `json:"leader_title,omitempty"` // e.g., "Professor", "Lehrstuhlinhaber"

	// Staff organization
	StaffGroups []struct {
		Role    string   `json:"role"`     // e.g., "Leitung", "Wissenschaftliche Mitarbeiter", "Sekretariat"
		Members []string `json:"members"`  // Names of people in this group
	} `json:"staff_groups,omitempty"`

	// Teaching info (Lehrveranstaltungen)
	TeachingCourses []struct {
		Title   string `json:"title"`
		Teacher string `json:"teacher,omitempty"`
	} `json:"teaching_courses,omitempty"`
}

// SubmitInstituteHierarchy saves hierarchy data from an institute page
// POST /api/v1/ai/extraction/institutes/submit
func (h *AIExtractionHandlers) SubmitInstituteHierarchy(c *gin.Context) {
	var data InstituteHierarchyData
	if err := c.ShouldBindJSON(&data); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid request: " + err.Error()})
		return
	}

	// Find or create department
	dept := &database.Department{
		UniversityID: data.UniversityID,
		Name:         data.InstituteName,
	}
	if data.InstituteURL != "" {
		dept.URL = &data.InstituteURL
	}

	err := h.repo.CreateDepartment(c.Request.Context(), dept)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to create department: " + err.Error()})
		return
	}

	// Find leader and set as supervisor for all staff in this institute
	var leaderID *uuid.UUID
	if data.LeaderName != "" {
		// Search for leader
		leaderParams := database.StaffSearchParams{
			Query:        data.LeaderName,
			UniversityID: &data.UniversityID,
			Limit:        1,
		}
		result, err := h.repo.SearchStaff(c.Request.Context(), leaderParams)
		if err == nil && len(result.Staff) > 0 {
			leaderID = &result.Staff[0].ID

			// Update leader with department and role
			leader := &result.Staff[0]
			leader.DepartmentID = &dept.ID
			roleLeitung := "leitung"
			leader.TeamRole = &roleLeitung
			leader.IsProfessor = true
			if data.LeaderTitle != "" {
				leader.AcademicTitle = &data.LeaderTitle
			}
			h.repo.CreateStaff(c.Request.Context(), leader)
		}
	}

	// Process staff groups
	updatedCount := 0
	for _, group := range data.StaffGroups {
		for _, memberName := range group.Members {
			// Find staff member
			memberParams := database.StaffSearchParams{
				Query:        memberName,
				UniversityID: &data.UniversityID,
				Limit:        1,
			}
			result, err := h.repo.SearchStaff(c.Request.Context(), memberParams)
			if err != nil || len(result.Staff) == 0 {
				continue
			}

			member := &result.Staff[0]
			member.DepartmentID = &dept.ID
			member.TeamRole = &group.Role

			// Set supervisor if leader was found and this is not the leader
			if leaderID != nil && member.ID != *leaderID {
				member.SupervisorID = leaderID
			}

			h.repo.CreateStaff(c.Request.Context(), member)
			updatedCount++
		}
	}

	c.JSON(http.StatusOK, gin.H{
		"status":          "success",
		"department_id":   dept.ID,
		"leader_id":       leaderID,
		"members_updated": updatedCount,
	})
}

// RegisterAIExtractionRoutes registers AI extraction routes
func (h *AIExtractionHandlers) RegisterRoutes(r *gin.RouterGroup) {
	ai := r.Group("/ai/extraction")

	// Profile extraction endpoints
	ai.GET("/pending", h.GetPendingProfiles)
	ai.POST("/submit", h.SubmitExtractedData)
	ai.POST("/submit-batch", h.SubmitBatchExtractedData)

	// Institute hierarchy endpoints
	ai.GET("/institutes", h.GetInstitutePages)
	ai.POST("/institutes/submit", h.SubmitInstituteHierarchy)
}