package rest

import (
	"git.sch9.ru/new_gate/ms-tester/internal/models"
	"git.sch9.ru/new_gate/ms-tester/internal/tester"
	"git.sch9.ru/new_gate/ms-tester/pkg"
	testerv1 "git.sch9.ru/new_gate/ms-tester/proto/tester/v1"
	"github.com/gofiber/fiber/v2"
	"io"
)

type TesterHandlers struct {
	problemsUC tester.ProblemUseCase
	contestsUC tester.ContestUseCase
}

func NewTesterHandlers(problemsUC tester.ProblemUseCase, contestsUC tester.ContestUseCase) *TesterHandlers {
	return &TesterHandlers{
		problemsUC: problemsUC,
		contestsUC: contestsUC,
	}
}

func (h *TesterHandlers) ListContests(c *fiber.Ctx, params testerv1.ListContestsParams) error {
	contests, count, err := h.contestsUC.ListContests(c.Context(), params.Page, params.PageSize)
	if err != nil {
		return c.SendStatus(pkg.ToREST(err))
	}

	resp := testerv1.ListContestsResponse{
		Contests: make([]testerv1.ContestsListItem, len(contests)),
		Page:     params.Page,
		MaxPage: func() int32 {
			if count%params.PageSize == 0 {
				return count / params.PageSize
			}
			return count/params.PageSize + 1
		}(),
	}

	for i, contest := range contests {
		resp.Contests[i] = testerv1.ContestsListItem{
			Id:        contest.Id,
			Title:     contest.Title,
			CreatedAt: contest.CreatedAt,
			UpdatedAt: contest.UpdatedAt,
		}
	}

	return c.JSON(resp)
}

func (h *TesterHandlers) ListProblems(c *fiber.Ctx, params testerv1.ListProblemsParams) error {
	problems, count, err := h.problemsUC.ListProblems(c.Context(), params.Page, params.PageSize)
	if err != nil {
		return c.SendStatus(pkg.ToREST(err))
	}

	resp := testerv1.ListProblemsResponse{
		Problems: make([]testerv1.ProblemListItem, len(problems)),
		Page:     params.Page,
		MaxPage: func() int32 {
			if count%params.PageSize == 0 {
				return count / params.PageSize
			}
			return count/params.PageSize + 1
		}(),
	}

	for i, problem := range problems {
		resp.Problems[i] = testerv1.ProblemListItem{
			Id:          problem.Id,
			Title:       problem.Title,
			MemoryLimit: problem.MemoryLimit,
			TimeLimit:   problem.TimeLimit,
			CreatedAt:   problem.CreatedAt,
			UpdatedAt:   problem.UpdatedAt,
		}
	}

	return c.JSON(resp)
}

func (h *TesterHandlers) CreateContest(c *fiber.Ctx) error {
	id, err := h.contestsUC.CreateContest(c.Context(), "Название контеста")
	if err != nil {
		return c.SendStatus(pkg.ToREST(err))
	}

	return c.JSON(testerv1.CreateContestResponse{
		Id: id,
	})
}

func (h *TesterHandlers) DeleteContest(c *fiber.Ctx, id int32) error {
	err := h.contestsUC.DeleteContest(c.Context(), id)
	if err != nil {
		return c.SendStatus(pkg.ToREST(err))
	}

	return c.SendStatus(fiber.StatusOK)
}

func (h *TesterHandlers) GetContest(c *fiber.Ctx, id int32) error {
	contest, err := h.contestsUC.ReadContestById(c.Context(), id)
	if err != nil {
		return c.SendStatus(pkg.ToREST(err))
	}

	//token, ok := c.Locals(TokenKey).(*models.JWT)
	//if !ok {
	//	return c.SendStatus(fiber.StatusUnauthorized)
	//}

	tasks, err := h.contestsUC.ReadRichTasks(c.Context(), id)
	if err != nil {
		return c.SendStatus(pkg.ToREST(err))
	}

	resp := testerv1.GetContestResponse{
		Contest: testerv1.Contest{
			Id:        id,
			Title:     contest.Title,
			CreatedAt: contest.CreatedAt,
			UpdatedAt: contest.UpdatedAt,
		},
		Tasks: make([]struct {
			BestSolution testerv1.BestSolution `json:"best_solution"`
			Task         testerv1.RichTask     `json:"task"`
		}, len(tasks)),
	}

	for i, task := range tasks {
		resp.Tasks[i] = struct {
			BestSolution testerv1.BestSolution `json:"best_solution"`
			Task         testerv1.RichTask     `json:"task"`
		}{
			BestSolution: testerv1.BestSolution{},
			Task: testerv1.RichTask{
				Id:          task.Id,
				ProblemId:   task.ProblemId,
				Position:    task.Position,
				Title:       task.Title,
				MemoryLimit: task.MemoryLimit,
				TimeLimit:   task.TimeLimit,
				CreatedAt:   task.CreatedAt,
				UpdatedAt:   task.UpdatedAt,
			},
		}
	}

	return c.JSON(resp)
}

func (h *TesterHandlers) DeleteParticipant(c *fiber.Ctx, params testerv1.DeleteParticipantParams) error {
	err := h.contestsUC.DeleteParticipant(c.Context(), params.ParticipantId)
	if err != nil {
		return c.SendStatus(pkg.ToREST(err))
	}

	return c.SendStatus(fiber.StatusOK)
}

func (h *TesterHandlers) AddParticipant(c *fiber.Ctx, params testerv1.AddParticipantParams) error {
	id, err := h.contestsUC.AddParticipant(c.Context(), params.ContestId, params.UserId)
	if err != nil {
		return c.SendStatus(pkg.ToREST(err))
	}

	return c.JSON(testerv1.AddParticipantResponse{
		Id: id,
	})
}

func (h *TesterHandlers) DeleteTask(c *fiber.Ctx, id int32) error {
	err := h.contestsUC.DeleteTask(c.Context(), id)
	if err != nil {
		return c.SendStatus(pkg.ToREST(err))
	}

	return c.SendStatus(fiber.StatusOK)
}

func (h *TesterHandlers) AddTask(c *fiber.Ctx, params testerv1.AddTaskParams) error {
	id, err := h.contestsUC.AddTask(c.Context(), params.ContestId, params.ProblemId)
	if err != nil {
		return c.SendStatus(pkg.ToREST(err))
	}

	return c.JSON(testerv1.AddTaskResponse{
		Id: id,
	})
}

func (h *TesterHandlers) CreateProblem(c *fiber.Ctx) error {
	id, err := h.problemsUC.CreateProblem(c.Context(), "Название задачи")
	if err != nil {
		return c.SendStatus(pkg.ToREST(err))
	}

	return c.JSON(testerv1.CreateProblemResponse{
		Id: id,
	})
}

func (h *TesterHandlers) DeleteProblem(c *fiber.Ctx, id int32) error {
	err := h.problemsUC.DeleteProblem(c.Context(), id)
	if err != nil {
		return c.SendStatus(pkg.ToREST(err))
	}

	return c.SendStatus(fiber.StatusOK)

}

func (h *TesterHandlers) GetProblem(c *fiber.Ctx, id int32) error {
	problem, err := h.problemsUC.ReadProblemById(c.Context(), id)
	if err != nil {
		return c.SendStatus(pkg.ToREST(err))
	}

	return c.JSON(
		testerv1.GetProblemResponse{Problem: testerv1.Problem{
			Id:          problem.Id,
			Title:       problem.Title,
			TimeLimit:   problem.TimeLimit,
			MemoryLimit: problem.MemoryLimit,

			Legend:       problem.Legend,
			InputFormat:  problem.InputFormat,
			OutputFormat: problem.OutputFormat,
			Notes:        problem.Notes,
			Scoring:      problem.Scoring,

			LegendHtml:       problem.LegendHtml,
			InputFormatHtml:  problem.InputFormatHtml,
			OutputFormatHtml: problem.OutputFormatHtml,
			NotesHtml:        problem.NotesHtml,
			ScoringHtml:      problem.ScoringHtml,

			CreatedAt: problem.CreatedAt,
			UpdatedAt: problem.UpdatedAt,
		}},
	)
}

func (h *TesterHandlers) ListParticipants(c *fiber.Ctx, params testerv1.ListParticipantsParams) error {
	participants, count, err := h.contestsUC.ListParticipants(c.Context(), params.ContestId, params.Page, params.PageSize)
	if err != nil {
		return c.SendStatus(pkg.ToREST(err))
	}

	resp := testerv1.ListParticipantsResponse{
		Participants: make([]testerv1.ParticipantsListItem, len(participants)),
		Page:         params.Page,
		MaxPage: func() int32 {
			if count%params.PageSize == 0 {
				return count / params.PageSize
			}
			return count/params.PageSize + 1
		}(),
	}

	for i, participant := range participants {
		resp.Participants[i] = testerv1.ParticipantsListItem{
			Id:        participant.Id,
			UserId:    participant.UserId,
			Name:      participant.Name,
			CreatedAt: participant.CreatedAt,
			UpdatedAt: participant.UpdatedAt,
		}
	}

	return c.JSON(resp)
}

func (h *TesterHandlers) UpdateProblem(c *fiber.Ctx, id int32) error {
	var req testerv1.UpdateProblemRequest
	err := c.BodyParser(&req)
	if err != nil {
		return err
	}

	err = h.problemsUC.UpdateProblem(c.Context(), id, models.ProblemUpdate{
		Title:       req.Title,
		MemoryLimit: req.MemoryLimit,
		TimeLimit:   req.TimeLimit,

		Legend:       req.Legend,
		InputFormat:  req.InputFormat,
		OutputFormat: req.OutputFormat,
		Notes:        req.Notes,
		Scoring:      req.Scoring,
	})

	if err != nil {
		return c.SendStatus(pkg.ToREST(err))
	}

	return c.SendStatus(fiber.StatusOK)
}

func (h *TesterHandlers) UpdateContest(c *fiber.Ctx, id int32) error {
	var req testerv1.UpdateContestRequest
	err := c.BodyParser(&req)
	if err != nil {
		return err
	}

	err = h.contestsUC.UpdateContest(c.Context(), id, models.ContestUpdate{
		Title: req.Title,
	})
	if err != nil {
		return c.SendStatus(pkg.ToREST(err))
	}

	return c.SendStatus(fiber.StatusOK)
}

func (h *TesterHandlers) UpdateParticipant(c *fiber.Ctx, params testerv1.UpdateParticipantParams) error {
	var req testerv1.UpdateParticipantRequest
	err := c.BodyParser(&req)
	if err != nil {
		return err
	}

	err = h.contestsUC.UpdateParticipant(c.Context(), params.ParticipantId, models.ParticipantUpdate{
		Name: req.Name,
	})
	if err != nil {
		return c.SendStatus(pkg.ToREST(err))
	}

	return c.SendStatus(fiber.StatusOK)
}

func (h *TesterHandlers) ListSolutions(c *fiber.Ctx, params testerv1.ListSolutionsParams) error {
	list, total, err := h.contestsUC.ListSolutions(c.Context(), models.SolutionsFilter{
		ContestId:     params.ContestId,
		Page:          params.Page,
		PageSize:      params.PageSize,
		ParticipantId: params.ParticipantId,
		TaskId:        params.TaskId,
		Language:      params.Language,
		Order:         params.Order,
		State:         params.State,
	})
	if err != nil {
		return c.SendStatus(pkg.ToREST(err))
	}

	resp := testerv1.ListSolutionsResponse{
		Solutions: make([]testerv1.SolutionListItem, len(list)),
		Page:      params.Page,
		MaxPage: func() int32 {
			if total%params.PageSize == 0 {
				return total / params.PageSize
			}
			return total/params.PageSize + 1
		}(),
	}

	for i, solution := range list {
		resp.Solutions[i] = testerv1.SolutionListItem{
			Id:            solution.Id,
			TaskId:        solution.TaskId,
			ContestId:     solution.ContestId,
			ParticipantId: solution.ParticipantId,
			Language:      solution.Language,
			Penalty:       solution.Penalty,
			Score:         solution.Score,
			State:         solution.State,
			TotalScore:    solution.TotalScore,
			CreatedAt:     solution.CreatedAt,
			UpdatedAt:     solution.UpdatedAt,
		}
	}

	return c.JSON(resp)
}

const (
	maxSolutionSize int64 = 10 * 1024 * 1024
)

func (h *TesterHandlers) CreateSolution(c *fiber.Ctx, params testerv1.CreateSolutionParams) error {
	s, err := c.FormFile("solution")
	if err != nil {
		return err
	}

	if s.Size == 0 || s.Size > maxSolutionSize {
		return c.SendStatus(fiber.StatusBadRequest)
	}

	f, err := s.Open()
	if err != nil {
		return err
	}
	defer f.Close()

	b, err := io.ReadAll(f)
	if err != nil {
		return err
	}

	id, err := h.contestsUC.CreateSolution(c.Context(), &models.SolutionCreation{
		TaskId:        params.TaskId,
		ParticipantId: 1,
		Language:      params.Language,
		Penalty:       0,
		Solution:      string(b),
	})
	if err != nil {
		return c.SendStatus(pkg.ToREST(err))
	}

	return c.JSON(testerv1.CreateSolutionResponse{
		Id: id,
	})
}

func (h *TesterHandlers) GetSolution(c *fiber.Ctx, id int32) error {
	solution, err := h.contestsUC.ReadSolution(c.Context(), id)
	if err != nil {
		return c.SendStatus(pkg.ToREST(err))
	}

	return c.JSON(
		testerv1.GetSolutionResponse{Solution: testerv1.Solution{
			Id:            solution.Id,
			TaskId:        solution.TaskId,
			ParticipantId: solution.ParticipantId,
			Solution:      solution.Solution,
			State:         solution.State,
			Score:         solution.Score,
			Penalty:       solution.Penalty,
			TotalScore:    solution.TotalScore,
			Language:      solution.Language,
			CreatedAt:     solution.CreatedAt,
			UpdatedAt:     solution.UpdatedAt,
		}},
	)
}

func (h *TesterHandlers) GetTask(c *fiber.Ctx, id int32) error {
	contest, err := h.contestsUC.ReadContestById(c.Context(), id)
	if err != nil {
		return c.SendStatus(pkg.ToREST(err))
	}

	tasks, err := h.contestsUC.ReadRichTasks(c.Context(), id)
	if err != nil {
		return c.SendStatus(pkg.ToREST(err))
	}

	t, err := h.contestsUC.ReadTask(c.Context(), id)
	if err != nil {
		return c.SendStatus(pkg.ToREST(err))
	}

	resp := testerv1.GetTaskResponse{
		Contest: struct {
			Id    int32               `json:"id"`
			Tasks []testerv1.RichTask `json:"tasks"`
			Title string              `json:"title"`
		}{
			Id:    contest.Id,
			Title: contest.Title,
			Tasks: make([]testerv1.RichTask, len(tasks)),
		},
		Task: testerv1.Task{
			Id:          t.Id,
			Title:       t.Title,
			MemoryLimit: t.MemoryLimit,
			TimeLimit:   t.TimeLimit,

			InputFormatHtml:  t.InputFormatHtml,
			LegendHtml:       t.LegendHtml,
			NotesHtml:        t.NotesHtml,
			OutputFormatHtml: t.OutputFormatHtml,
			Position:         t.Position,
			ScoringHtml:      t.ScoringHtml,

			CreatedAt: t.CreatedAt,
			UpdatedAt: t.UpdatedAt,
		},
	}

	for i, task := range tasks {
		resp.Contest.Tasks[i] = testerv1.RichTask{
			Id:          task.Id,
			Position:    task.Position,
			Title:       task.Title,
			MemoryLimit: task.MemoryLimit,
			ProblemId:   task.ProblemId,
			TimeLimit:   task.TimeLimit,
			CreatedAt:   task.CreatedAt,
			UpdatedAt:   task.UpdatedAt}
	}

	return c.JSON(resp)
}

func (h *TesterHandlers) GetMonitor(c *fiber.Ctx, params testerv1.GetMonitorParams) error {
	contest, err := h.contestsUC.ReadContestById(c.Context(), params.ContestId)
	if err != nil {
		return c.SendStatus(pkg.ToREST(err))
	}

	monitor, err := h.contestsUC.ReadMonitor(c.Context(), params.ContestId)
	if err != nil {
		return c.SendStatus(pkg.ToREST(err))
	}

	tasks, err := h.contestsUC.ReadRichTasks(c.Context(), params.ContestId)
	if err != nil {
		return c.SendStatus(pkg.ToREST(err))
	}

	resp := testerv1.GetMonitorResponse{
		Contest: struct {
			Id    int32               `json:"id"`
			Tasks []testerv1.RichTask `json:"tasks"`
			Title string              `json:"title"`
		}{
			Id:    contest.Id,
			Title: contest.Title,
			Tasks: make([]testerv1.RichTask, len(tasks)),
		},
		Participants: make([]struct {
			Id             int32                       `json:"id"`
			Name           string                      `json:"name"`
			PenaltyInTotal int32                       `json:"penalty_in_total"`
			Solutions      []testerv1.SolutionListItem `json:"solutions"`
			SolvedInTotal  int32                       `json:"solved_in_total"`
		}, len(monitor.Participants)),
		SummaryPerProblem: make([]struct {
			Id      int32 `json:"id"`
			Success int32 `json:"success"`
			Total   int32 `json:"total"`
		}, len(monitor.Summary)),
	}

	for i, participant := range monitor.Participants {
		resp.Participants[i] = struct {
			Id             int32                       `json:"id"`
			Name           string                      `json:"name"`
			PenaltyInTotal int32                       `json:"penalty_in_total"`
			Solutions      []testerv1.SolutionListItem `json:"solutions"`
			SolvedInTotal  int32                       `json:"solved_in_total"`
		}{
			Id:             participant.Id,
			Name:           participant.Name,
			PenaltyInTotal: participant.PenaltyInTotal,
			Solutions:      make([]testerv1.SolutionListItem, len(participant.Solutions)),
			SolvedInTotal:  participant.SolvedInTotal,
		}

		for j, solution := range participant.Solutions {
			resp.Participants[i].Solutions[j] = testerv1.SolutionListItem{
				ContestId:     solution.ContestId,
				CreatedAt:     solution.CreatedAt,
				Id:            solution.Id,
				Language:      solution.Language,
				ParticipantId: solution.ParticipantId,
				Penalty:       solution.Penalty,
				Score:         solution.Score,
				State:         solution.State,
				TaskId:        solution.TaskId,
				TotalScore:    solution.TotalScore,
				UpdatedAt:     solution.UpdatedAt,
			}
		}
	}

	for i, problem := range monitor.Summary {
		resp.SummaryPerProblem[i] = struct {
			Id      int32 `json:"id"`
			Success int32 `json:"success"`
			Total   int32 `json:"total"`
		}{
			Id:      problem.Id,
			Success: problem.Success,
			Total:   problem.Total,
		}
	}

	for i, task := range tasks {
		resp.Contest.Tasks[i] = testerv1.RichTask{
			Id:          task.Id,
			Position:    task.Position,
			Title:       task.Title,
			MemoryLimit: task.MemoryLimit,
			ProblemId:   task.ProblemId,
			TimeLimit:   task.TimeLimit,
			CreatedAt:   task.CreatedAt,
			UpdatedAt:   task.UpdatedAt}
	}

	return c.JSON(resp)
}