package at.hannibal2.skyhanni.features.commands

import at.hannibal2.skyhanni.config.commands.Commands
import at.hannibal2.skyhanni.utils.StringUtils.splitLines
import at.hannibal2.skyhanni.utils.chat.Text
import at.hannibal2.skyhanni.utils.chat.Text.asComponent
import at.hannibal2.skyhanni.utils.chat.Text.center
import at.hannibal2.skyhanni.utils.chat.Text.fitToChat
import at.hannibal2.skyhanni.utils.chat.Text.hover
import at.hannibal2.skyhanni.utils.chat.Text.onClick
import at.hannibal2.skyhanni.utils.chat.Text.send
import at.hannibal2.skyhanni.utils.chat.Text.style
import at.hannibal2.skyhanni.utils.chat.Text.suggest
import net.minecraft.util.EnumChatFormatting
import net.minecraft.util.IChatComponent

object HelpCommand {

    private const val COMMANDS_PER_PAGE = 15
    private const val HELP_ID = -6457563

    private fun createDivider() = Text.HYPHEN.fitToChat().style {
        strikethrough = true
        color = EnumChatFormatting.BLUE
    }

    private fun createCommandEntry(command: Commands.CommandInfo): IChatComponent {
        val category = command.category
        val color = category.color
        val description = command.description.splitLines(200).replace("§r", "§7")
        val categoryDescription = category.description.splitLines(200).replace("§r", "§7")

        return Text.text("§7 - $color${command.name}") {
            this.hover = Text.multiline(
                "§e/${command.name}",
                if (description.isNotEmpty()) description.prependIndent("  ") else null,
                "",
                "$color§l${category.categoryName}",
                categoryDescription.prependIndent("  ")
            )
            this.suggest = "/${command.name}"
        }
    }

    private fun showPage(
        page: Int,
        search: String,
        commands: List<Commands.CommandInfo>
    ) {
        val filtered = commands.filter {
            it.name.contains(search, ignoreCase = true) || it.description.contains(search, ignoreCase = true)
        }
        val maxPage = filtered.size / COMMANDS_PER_PAGE + 1
        val page = page.coerceIn(1, maxPage)
        val title = if (search.isEmpty()) "§6SkyHanni Commands" else "§6SkyHanni Commands matching '$search'"

        val text = mutableListOf<IChatComponent>()

        text.add(createDivider())
        text.add(title.asComponent().center())
        text.add(Text.join(
            if (page > 1) "§6§l<<".asComponent {
                this.hover = "§eClick to view page ${page - 1}".asComponent()
                this.onClick { showPage(page - 1, search, commands) }
            } else null,
            " ",
            "§6(Page $page of $maxPage)",
            " ",
            if (page < maxPage) "§6§l>>".asComponent {
                this.hover = "§eClick to view page ${page + 1}".asComponent()
                this.onClick { showPage(page + 1, search, commands) }
            } else null
        ).center())
        text.add(createDivider())

        if (filtered.isEmpty()) {
            text.add(Text.EMPTY)
            text.add("§cNo reminders found.".asComponent().center())
            text.add(Text.EMPTY)
        } else {
            val start = (page - 1) * COMMANDS_PER_PAGE
            val end = (page * COMMANDS_PER_PAGE).coerceAtMost(filtered.size)
            for (i in start until end) {
                text.add(createCommandEntry(filtered[i]))
            }
        }

        text.add(createDivider())

        Text.multiline(text).send(HELP_ID)
    }

    fun onCommand(args: Array<String>, commands: List<Commands.CommandInfo>) {
        val page: Int
        val search: String
        if (args.firstOrNull() == "-p") {
            page = args.getOrNull(1)?.toIntOrNull() ?: 1
            search = args.drop(2).joinToString(" ")
        } else {
            page = 1
            search = args.joinToString(" ")
        }
        showPage(page, search, commands)
    }
}