package handlers

import (
	"net/http"

	"github.com/breakpilot/school-service/internal/models"
	"github.com/gin-gonic/gin"
)

// ---------- Solutions ----------

func (h *Handler) CreateTimetableSolution(c *gin.Context) {
	uid := getUserID(c)
	if uid == "" {
		respondError(c, http.StatusUnauthorized, "User not authenticated")
		return
	}
	var req models.CreateTimetableSolutionRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		respondError(c, http.StatusBadRequest, "Invalid request: "+err.Error())
		return
	}
	sol, err := h.timetableService.CreateSolution(c.Request.Context(), uid, &req)
	if err != nil {
		respondError(c, http.StatusInternalServerError, "Failed to create solution: "+err.Error())
		return
	}
	// Fire-and-forget the solver invocation; the row is persisted regardless.
	if err := h.timetableService.TriggerSolve(c.Request.Context(), h.solverServiceURL, sol.ID.String(), uid); err != nil {
		// Don't fail the request — the solution row already shows status=failed.
		// The client will see error_message via GET /solutions/:id.
		respondCreated(c, sol)
		return
	}
	respondCreated(c, sol)
}

func (h *Handler) ListTimetableSolutions(c *gin.Context) {
	uid := getUserID(c)
	if uid == "" {
		respondError(c, http.StatusUnauthorized, "User not authenticated")
		return
	}
	out, err := h.timetableService.ListSolutions(c.Request.Context(), uid)
	if err != nil {
		respondError(c, http.StatusInternalServerError, "Failed to list solutions: "+err.Error())
		return
	}
	respondSuccess(c, out)
}

func (h *Handler) GetTimetableSolution(c *gin.Context) {
	uid := getUserID(c)
	if uid == "" {
		respondError(c, http.StatusUnauthorized, "User not authenticated")
		return
	}
	sol, err := h.timetableService.GetSolution(c.Request.Context(), c.Param("id"), uid)
	if err != nil {
		respondError(c, http.StatusNotFound, "Solution not found")
		return
	}
	respondSuccess(c, sol)
}

func (h *Handler) ListTimetableLessons(c *gin.Context) {
	uid := getUserID(c)
	if uid == "" {
		respondError(c, http.StatusUnauthorized, "User not authenticated")
		return
	}
	out, err := h.timetableService.ListLessons(c.Request.Context(), c.Param("id"), uid)
	if err != nil {
		respondError(c, http.StatusInternalServerError, "Failed to list lessons: "+err.Error())
		return
	}
	respondSuccess(c, out)
}

func (h *Handler) DeleteTimetableSolution(c *gin.Context) {
	uid := getUserID(c)
	if uid == "" {
		respondError(c, http.StatusUnauthorized, "User not authenticated")
		return
	}
	if err := h.timetableService.DeleteSolution(c.Request.Context(), c.Param("id"), uid); err != nil {
		respondError(c, http.StatusInternalServerError, "Failed to delete solution: "+err.Error())
		return
	}
	c.JSON(http.StatusOK, gin.H{"message": "Solution deleted"})
}

// UpdateTimetableLessonPin flips the pinned flag on a single lesson.
// The solver respects pinned cells via @PlanningPin when this user re-solves.
func (h *Handler) UpdateTimetableLessonPin(c *gin.Context) {
	uid := getUserID(c)
	if uid == "" {
		respondError(c, http.StatusUnauthorized, "User not authenticated")
		return
	}
	var req models.UpdateLessonPinRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		respondError(c, http.StatusBadRequest, "Invalid request: "+err.Error())
		return
	}
	if err := h.timetableService.UpdateLessonPin(c.Request.Context(), c.Param("id"), uid, req.Pinned); err != nil {
		respondError(c, http.StatusInternalServerError, "Failed to update lesson pin: "+err.Error())
		return
	}
	c.JSON(http.StatusOK, gin.H{"message": "Lesson pin updated", "pinned": req.Pinned})
}