package api

import (
	"errors"
	"fmt"
	"net/http"

	"github.com/bluenviron/mediamtx/internal/conf"
	"github.com/bluenviron/mediamtx/internal/conf/jsonwrapper"
	"github.com/bluenviron/mediamtx/internal/defs"
	"github.com/gin-gonic/gin"
)

func (a *API) onConfigPathsList(ctx *gin.Context) {
	a.mutex.RLock()
	c := a.Conf
	a.mutex.RUnlock()

	data := &defs.APIPathConfList{
		Items: make([]*conf.Path, len(c.Paths)),
	}

	for i, key := range sortedKeys(c.Paths) {
		data.Items[i] = c.Paths[key]
	}

	data.ItemCount = len(data.Items)
	pageCount, err := paginate(&data.Items, ctx.Query("itemsPerPage"), ctx.Query("page"))
	if err != nil {
		a.writeError(ctx, http.StatusBadRequest, err)
		return
	}
	data.PageCount = pageCount

	ctx.JSON(http.StatusOK, data)
}

func (a *API) onConfigPathsGet(ctx *gin.Context) {
	confName, ok := paramName(ctx)
	if !ok {
		a.writeError(ctx, http.StatusBadRequest, fmt.Errorf("invalid name"))
		return
	}

	a.mutex.RLock()
	c := a.Conf
	a.mutex.RUnlock()

	p, ok := c.Paths[confName]
	if !ok {
		a.writeError(ctx, http.StatusNotFound, fmt.Errorf("path configuration not found"))
		return
	}

	ctx.JSON(http.StatusOK, p)
}

func (a *API) onConfigPathsAdd(ctx *gin.Context) { //nolint:dupl
	confName, ok := paramName(ctx)
	if !ok {
		a.writeError(ctx, http.StatusBadRequest, fmt.Errorf("invalid name"))
		return
	}

	var p conf.OptionalPath
	err := jsonwrapper.Decode(ctx.Request.Body, &p)
	if err != nil {
		a.writeError(ctx, http.StatusBadRequest, err)
		return
	}

	a.mutex.Lock()
	defer a.mutex.Unlock()

	newConf := a.Conf.Clone()

	err = newConf.AddPath(confName, &p)
	if err != nil {
		a.writeError(ctx, http.StatusBadRequest, err)
		return
	}

	err = newConf.Validate(nil)
	if err != nil {
		a.writeError(ctx, http.StatusBadRequest, err)
		return
	}

	a.Conf = newConf
	a.Parent.APIConfigSet(newConf)

	ctx.Status(http.StatusOK)
}

func (a *API) onConfigPathsPatch(ctx *gin.Context) { //nolint:dupl
	confName, ok := paramName(ctx)
	if !ok {
		a.writeError(ctx, http.StatusBadRequest, fmt.Errorf("invalid name"))
		return
	}

	var p conf.OptionalPath
	err := jsonwrapper.Decode(ctx.Request.Body, &p)
	if err != nil {
		a.writeError(ctx, http.StatusBadRequest, err)
		return
	}

	a.mutex.Lock()
	defer a.mutex.Unlock()

	newConf := a.Conf.Clone()

	err = newConf.PatchPath(confName, &p)
	if err != nil {
		if errors.Is(err, conf.ErrPathNotFound) {
			a.writeError(ctx, http.StatusNotFound, err)
		} else {
			a.writeError(ctx, http.StatusBadRequest, err)
		}
		return
	}

	err = newConf.Validate(nil)
	if err != nil {
		a.writeError(ctx, http.StatusBadRequest, err)
		return
	}

	a.Conf = newConf
	a.Parent.APIConfigSet(newConf)

	ctx.Status(http.StatusOK)
}

func (a *API) onConfigPathsReplace(ctx *gin.Context) { //nolint:dupl
	confName, ok := paramName(ctx)
	if !ok {
		a.writeError(ctx, http.StatusBadRequest, fmt.Errorf("invalid name"))
		return
	}

	var p conf.OptionalPath
	err := jsonwrapper.Decode(ctx.Request.Body, &p)
	if err != nil {
		a.writeError(ctx, http.StatusBadRequest, err)
		return
	}

	a.mutex.Lock()
	defer a.mutex.Unlock()

	newConf := a.Conf.Clone()

	err = newConf.ReplacePath(confName, &p)
	if err != nil {
		if errors.Is(err, conf.ErrPathNotFound) {
			a.writeError(ctx, http.StatusNotFound, err)
		} else {
			a.writeError(ctx, http.StatusBadRequest, err)
		}
		return
	}

	err = newConf.Validate(nil)
	if err != nil {
		a.writeError(ctx, http.StatusBadRequest, err)
		return
	}

	a.Conf = newConf
	a.Parent.APIConfigSet(newConf)

	ctx.Status(http.StatusOK)
}

func (a *API) onConfigPathsDelete(ctx *gin.Context) {
	confName, ok := paramName(ctx)
	if !ok {
		a.writeError(ctx, http.StatusBadRequest, fmt.Errorf("invalid name"))
		return
	}

	a.mutex.Lock()
	defer a.mutex.Unlock()

	newConf := a.Conf.Clone()

	err := newConf.RemovePath(confName)
	if err != nil {
		if errors.Is(err, conf.ErrPathNotFound) {
			a.writeError(ctx, http.StatusNotFound, err)
		} else {
			a.writeError(ctx, http.StatusBadRequest, err)
		}
		return
	}

	err = newConf.Validate(nil)
	if err != nil {
		a.writeError(ctx, http.StatusBadRequest, err)
		return
	}

	a.Conf = newConf
	a.Parent.APIConfigSet(newConf)

	ctx.Status(http.StatusOK)
}