package api

import (
	"net/http"

	"arma3-web-server/internal/models"
	"arma3-web-server/internal/services"

	"github.com/gin-gonic/gin"
)

type createModlistInput struct {
	Name string `json:"name" binding:"required"`
}

type updateModlistInput struct {
	Name string          `json:"name" binding:"required"`
	Mods []models.ModEntry `json:"mods"`
}

type duplicateModlistInput struct {
	Name string `json:"name" binding:"required"`
}

func (h *Handler) ListModlists(c *gin.Context) {
	items, err := h.modlists.List()
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, items)
}

func (h *Handler) CreateModlist(c *gin.Context) {
	var input createModlistInput
	if err := c.ShouldBindJSON(&input); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	ml, err := h.modlists.Create(input.Name)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusCreated, ml)
}

func (h *Handler) GetModlist(c *gin.Context) {
	ml, err := h.modlists.Get(c.Param("id"))
	if err != nil {
		c.JSON(http.StatusNotFound, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, ml)
}

func (h *Handler) UpdateModlist(c *gin.Context) {
	var input updateModlistInput
	if err := c.ShouldBindJSON(&input); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	ml, err := h.modlists.Update(c.Param("id"), input.Name, input.Mods)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, ml)
}

func (h *Handler) DeleteModlist(c *gin.Context) {
	if err := h.modlists.Delete(c.Param("id")); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusNoContent, nil)
}

func (h *Handler) DuplicateModlist(c *gin.Context) {
	var input duplicateModlistInput
	if err := c.ShouldBindJSON(&input); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	ml, err := h.modlists.Duplicate(c.Param("id"), input.Name)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusCreated, ml)
}

func (h *Handler) ImportModlist(c *gin.Context) {
	file, header, err := c.Request.FormFile("file")
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "file field required"})
		return
	}
	defer file.Close()

	_, mods, err := services.ParseModlistHTML(file)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "parse html: " + err.Error()})
		return
	}

	listName := services.FileNameToModlistName(header.Filename)

	ml, err := h.modlists.Create(listName)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	ml, err = h.modlists.Update(ml.ID, ml.Name, mods)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusCreated, ml)
}

type modStatus struct {
	ID         string `json:"id"`
	Name       string `json:"name"`
	Enabled    bool   `json:"enabled"`
	Downloaded bool   `json:"downloaded"`
}

func (h *Handler) CheckModlistMods(c *gin.Context) {
	ml, err := h.modlists.Get(c.Param("id"))
	if err != nil {
		c.JSON(http.StatusNotFound, gin.H{"error": err.Error()})
		return
	}

	dir := h.process.ServerfileDir()
	var result []modStatus
	for _, m := range ml.Mods {
		result = append(result, modStatus{
			ID:         m.ID,
			Name:       m.Name,
			Enabled:    m.Enabled,
			Downloaded: services.CheckWorkshopMod(dir, m.ID),
		})
	}
	c.JSON(http.StatusOK, result)
}

func (h *Handler) DownloadMissingMods(c *gin.Context) {
	ml, err := h.modlists.Get(c.Param("id"))
	if err != nil {
		c.JSON(http.StatusNotFound, gin.H{"error": err.Error()})
		return
	}

	dir := h.process.ServerfileDir()
	var missing []string
	for _, m := range ml.Mods {
		if m.ID != "" && !services.CheckWorkshopMod(dir, m.ID) {
			missing = append(missing, m.ID)
		}
	}

	if len(missing) == 0 {
		c.JSON(http.StatusOK, gin.H{"status": "all mods present"})
		return
	}

	if err := h.steamcmd.DownloadMods(missing); err != nil {
		c.JSON(http.StatusConflict, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"status": "downloading", "count": len(missing)})
}

func (h *Handler) UpdateAllMods(c *gin.Context) {
	ml, err := h.modlists.Get(c.Param("id"))
	if err != nil {
		c.JSON(http.StatusNotFound, gin.H{"error": err.Error()})
		return
	}

	var ids []string
	for _, m := range ml.Mods {
		if m.ID != "" {
			ids = append(ids, m.ID)
		}
	}

	if len(ids) == 0 {
		c.JSON(http.StatusOK, gin.H{"status": "no mods with workshop ids"})
		return
	}

	if err := h.steamcmd.DownloadMods(ids); err != nil {
		c.JSON(http.StatusConflict, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"status": "updating", "count": len(ids)})
}