package main

import (
	"html/template"
	"net/http"
	"strconv"
	"time"

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

func serve(port string) {
	router := gin.Default()
	router.LoadHTMLGlob("templates/*")
	router.Use(static.Serve("/static/", static.LocalFile("./static", true)))

	router.GET("/", func(c *gin.Context) {
		c.Redirect(302, "/"+randomAlliterateCombo())
	})
	router.GET("/:page", func(c *gin.Context) {
		page := c.Param("page")
		c.Redirect(302, "/"+page+"/edit")
	})
	router.GET("/:page/:command", handlePageRequest)
	router.POST("/update", handlePageUpdate)
	router.POST("/prime", handlePrime)
	router.POST("/lock", handleLock)
	router.POST("/encrypt", handleEncrypt)

	router.Run(":" + port)
}

func handlePageRequest(c *gin.Context) {
	page := c.Param("page")
	command := c.Param("command")
	version := c.DefaultQuery("version", "ajksldfjl")
	p := Open(page)
	if p.IsPrimedForSelfDestruct && !p.IsLocked && !p.IsEncrypted {
		p.Update("*This page has now self-destructed.*\n\n" + p.Text.GetCurrent())
		p.Erase()
	}
	if command == "erase" && !p.IsLocked {
		p.Erase()
		c.Redirect(302, "/"+page+"/edit")
	}
	rawText := p.Text.GetCurrent()
	rawHTML := p.RenderedPage

	// Check to see if an old version is requested
	versionInt, versionErr := strconv.Atoi(version)
	if versionErr == nil && versionInt > 0 {
		versionText, err := p.Text.GetPreviousByTimestamp(int64(versionInt))
		if err == nil {
			rawText = versionText
			rawHTML = GithubMarkdownToHTML(rawText)
		}
	}
	versionsInt64 := p.Text.GetSnapshots()
	versionsText := make([]string, len(versionsInt64))
	for i, v := range versionsInt64 {
		versionsText[i] = time.Unix(v/1000000000, 0).String()
	}

	if command == "raw" {
		c.Writer.Header().Set("Content-Type", contentType(p.Name))
		c.Writer.Header().Set("Access-Control-Allow-Origin", "*")
		c.Writer.Header().Set("Access-Control-Max-Age", "86400")
		c.Writer.Header().Set("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, DELETE, UPDATE")
		c.Writer.Header().Set("Access-Control-Allow-Headers", "Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token, Authorization, X-Max")
		c.Writer.Header().Set("Access-Control-Allow-Credentials", "true")
		c.Data(200, contentType(p.Name), []byte(rawText))
		return
	}

	c.HTML(http.StatusOK, "index.html", gin.H{
		"EditPage":     command == "edit",
		"ViewPage":     command == "view",
		"ListPage":     command == "list",
		"HistoryPage":  command == "history",
		"Page":         p.Name,
		"RenderedPage": template.HTML([]byte(rawHTML)),
		"RawPage":      rawText,
		"Versions":     versionsInt64,
		"VersionsText": versionsText,
		"IsLocked":     p.IsLocked,
		"IsEncrypted":  p.IsEncrypted,
	})
}

func handlePageUpdate(c *gin.Context) {
	type QueryJSON struct {
		Page    string `json:"page"`
		NewText string `json:"new_text"`
	}
	var json QueryJSON
	if c.BindJSON(&json) != nil {
		c.JSON(http.StatusOK, gin.H{"success": false, "message": "Wrong JSON"})
		return
	}
	if len(json.NewText) > 100000 {
		c.JSON(http.StatusOK, gin.H{"success": false, "message": "Too much"})
		return
	}
	log.Trace("Update: %v", json)
	p := Open(json.Page)
	var message string
	if p.IsLocked {
		message = "Locked"
	} else if p.IsEncrypted {
		message = "Encrypted"
	} else {
		p.Update(json.NewText)
		p.Save()
		message = "Saved"
	}
	c.JSON(http.StatusOK, gin.H{"success": false, "message": message})
}

func handlePrime(c *gin.Context) {
	type QueryJSON struct {
		Page string `json:"page"`
	}
	var json QueryJSON
	if c.BindJSON(&json) != nil {
		c.String(http.StatusBadRequest, "Problem binding keys")
		return
	}
	log.Trace("Update: %v", json)
	p := Open(json.Page)
	if p.IsLocked {
		c.JSON(http.StatusOK, gin.H{"success": false, "message": "Locked"})
		return
	} else if p.IsEncrypted {
		c.JSON(http.StatusOK, gin.H{"success": false, "message": "Encrypted"})
		return
	}
	p.IsPrimedForSelfDestruct = true
	p.Save()
	c.JSON(http.StatusOK, gin.H{"success": true, "message": "Primed"})
}

func handleLock(c *gin.Context) {
	type QueryJSON struct {
		Page       string `json:"page"`
		Passphrase string `json:"passphrase"`
	}

	var json QueryJSON
	if c.BindJSON(&json) != nil {
		c.String(http.StatusBadRequest, "Problem binding keys")
		return
	}
	p := Open(json.Page)
	var message string
	if p.IsLocked {
		err2 := CheckPasswordHash(json.Passphrase, p.PassphraseToUnlock)
		if err2 != nil {
			c.JSON(http.StatusOK, gin.H{"success": false, "message": "Can't unlock"})
			return
		}
		p.IsLocked = false
		message = "Unlocked"
	} else {
		p.IsLocked = true
		p.PassphraseToUnlock = HashPassword(json.Passphrase)
		message = "Locked"
	}
	p.Save()
	c.JSON(http.StatusOK, gin.H{"success": true, "message": message})
}

func handleEncrypt(c *gin.Context) {
	type QueryJSON struct {
		Page       string `json:"page"`
		Passphrase string `json:"passphrase"`
	}

	var json QueryJSON
	if c.BindJSON(&json) != nil {
		c.String(http.StatusBadRequest, "Problem binding keys")
		return
	}
	p := Open(json.Page)
	q := Open(json.Page)
	var message string
	if p.IsEncrypted {
		decrypted, err2 := DecryptString(p.Text.GetCurrent(), json.Passphrase)
		if err2 != nil {
			c.JSON(http.StatusOK, gin.H{"success": false, "message": "Wrong password"})
			return
		}
		q.Erase()
		q = Open(json.Page)
		q.Update(decrypted)
		q.IsEncrypted = false
		q.IsLocked = p.IsLocked
		q.IsPrimedForSelfDestruct = p.IsPrimedForSelfDestruct
		message = "Decrypted"
	} else {
		currentText := p.Text.GetCurrent()
		encrypted, _ := EncryptString(currentText, json.Passphrase)
		q.Erase()
		q = Open(json.Page)
		q.Update(encrypted)
		q.IsEncrypted = true
		q.IsLocked = p.IsLocked
		q.IsPrimedForSelfDestruct = p.IsPrimedForSelfDestruct
		message = "Encrypted"
	}
	q.Save()
	c.JSON(http.StatusOK, gin.H{"success": true, "message": message})
}