<script setup lang="ts">
import type { Task } from '~/services/dto/task'
import type { TaskStatus } from '~/services/dto/task-status'
import type { TaskEffort } from '~/services/dto/task-effort'
import type { TaskPriority } from '~/services/dto/task-priority'
import type { TaskTag } from '~/services/dto/task-tag'
import type { TaskGroup } from '~/services/dto/task-group'
import type { UserData } from '~/services/dto/user-data'
import type { Project } from '~/services/dto/project'
import { useTaskService } from '~/services/tasks'
import { useTaskStatusService } from '~/services/task-statuses'
import { useTaskEffortService } from '~/services/task-efforts'
import { useTaskPriorityService } from '~/services/task-priorities'
import { useTaskTagService } from '~/services/task-tags'
import { useTaskGroupService } from '~/services/task-groups'
import { useUserService } from '~/services/users'
import { useProjectService } from '~/services/projects'

const { t } = useI18n()
const auth = useAuthStore()

useHead({ title: t('myTasks.title') })

const taskService = useTaskService()
const statusService = useTaskStatusService()
const effortService = useTaskEffortService()
const priorityService = useTaskPriorityService()
const tagService = useTaskTagService()
const groupService = useTaskGroupService()
const userService = useUserService()
const projectService = useProjectService()

const tasks = ref<Task[]>([])
const statuses = ref<TaskStatus[]>([])
const efforts = ref<TaskEffort[]>([])
const priorities = ref<TaskPriority[]>([])
const tags = ref<TaskTag[]>([])
const groups = ref<TaskGroup[]>([])
const users = ref<UserData[]>([])
const projects = ref<Project[]>([])
const isLoading = ref(true)

// Filters
const selectedProjectId = ref<number | null>(null)
const selectedGroupId = ref<number | null>(null)
const selectedTagId = ref<number | null>(null)
const selectedPriorityId = ref<number | null>(null)
const selectedEffortId = ref<number | null>(null)
const selectedAssigneeId = ref<number | null>(auth.user?.id ?? null)

// View toggle
const viewMode = ref<'kanban' | 'list'>('kanban')

// Modal
const taskModalOpen = ref(false)
const selectedTask = ref<Task | null>(null)

// Timer
const timerStore = useTimerStore()

function isTimerOnTask(task: Task): boolean {
    const entry = timerStore.activeEntry
    if (!entry?.task) return false
    const entryTaskId = typeof entry.task === 'string'
        ? entry.task
        : (entry.task['@id'] ?? entry.task.id)
    const taskId = task['@id'] ?? task.id
    return entryTaskId === taskId || entryTaskId === `/api/tasks/${task.id}`
}

// Filter options
const projectOptions = computed(() =>
    projects.value.map(p => ({ label: p.name, value: p.id }))
)

const groupOptions = computed(() => {
    let g = groups.value.filter(g => !g.archived)
    if (selectedProjectId.value) {
        g = g.filter(g => g.project?.id === selectedProjectId.value)
    }
    return g.map(g => ({ label: g.title, value: g.id }))
})

const tagOptions = computed(() =>
    tags.value.map(t => ({ label: t.label, value: t.id }))
)

const priorityOptions = computed(() =>
    priorities.value.map(p => ({ label: p.label, value: p.id }))
)

const effortOptions = computed(() =>
    efforts.value.map(e => ({ label: e.label, value: e.id }))
)

const assigneeOptions = computed(() =>
    users.value.map(u => ({ label: u.username, value: u.id }))
)

// Kanban helpers
const sortedStatuses = computed(() =>
    [...statuses.value].sort((a, b) => a.position - b.position)
)

function tasksByStatus(statusId: number): Task[] {
    return tasks.value.filter(t => t.status?.id === statusId)
}

const backlogTasks = computed(() =>
    tasks.value.filter(t => !t.status)
)

// Data loading
async function loadReferenceData() {
    const [s, e, pr, tg, g, u, p] = await Promise.all([
        statusService.getAll(),
        effortService.getAll(),
        priorityService.getAll(),
        tagService.getAll(),
        groupService.getAll(),
        userService.getAll(),
        projectService.getAll(),
    ])
    statuses.value = s
    efforts.value = e
    priorities.value = pr
    tags.value = tg
    groups.value = g
    users.value = u
    projects.value = p
}

async function loadTasks() {
    const params: Record<string, string | number | boolean | string[]> = {
        archived: false,
    }
    if (selectedAssigneeId.value) {
        params.assignee = `/api/users/${selectedAssigneeId.value}`
    }
    if (selectedProjectId.value) {
        params.project = `/api/projects/${selectedProjectId.value}`
    }
    if (selectedGroupId.value) {
        params.group = `/api/task_groups/${selectedGroupId.value}`
    }
    if (selectedPriorityId.value) {
        params.priority = `/api/task_priorities/${selectedPriorityId.value}`
    }
    if (selectedEffortId.value) {
        params.effort = `/api/task_efforts/${selectedEffortId.value}`
    }
    if (selectedTagId.value) {
        params['tags[]'] = `/api/task_tags/${selectedTagId.value}`
    }
    tasks.value = await taskService.getFiltered(params)
}

async function loadAll() {
    isLoading.value = true
    try {
        await Promise.all([loadReferenceData(), loadTasks()])
    } finally {
        isLoading.value = false
    }
}

// Watch filters to reload tasks
watch(
    [selectedProjectId, selectedGroupId, selectedTagId, selectedPriorityId, selectedEffortId, selectedAssigneeId],
    () => { loadTasks() },
)

// Reset group when project changes
watch(selectedProjectId, () => {
    selectedGroupId.value = null
}, { flush: 'sync' })

// Drag & drop
const dragOverStatusId = ref<number | null>(null)
const dragCounter = ref(0)

function onDragEnter(id: number) {
    dragCounter.value++
    dragOverStatusId.value = id
}

function onDragLeave() {
    dragCounter.value--
    if (dragCounter.value === 0) {
        dragOverStatusId.value = null
    }
}

function onDrop(event: DragEvent) {
    dragCounter.value = 0
    dragOverStatusId.value = null
    return Number(event.dataTransfer!.getData('text/plain'))
}

async function onDropStatus(event: DragEvent, status: TaskStatus) {
    const taskId = onDrop(event)
    const task = tasks.value.find(t => t.id === taskId)
    if (!task || task.status?.id === status.id) return
    task.status = status
    await taskService.update(taskId, { status: `/api/task_statuses/${status.id}` })
}

async function onDropBacklog(event: DragEvent) {
    const taskId = onDrop(event)
    const task = tasks.value.find(t => t.id === taskId)
    if (!task || !task.status) return
    task.status = null
    await taskService.update(taskId, { status: null })
}

// Modal
function openTaskEdit(task: Task) {
    selectedTask.value = task
    taskModalOpen.value = true
}

async function onSaved() {
    await loadTasks()
}

onMounted(() => {
    loadAll()
})
</script>

<template>
    <div>
        <!-- Header -->
        <div class="flex items-center justify-between">
            <h1 class="text-2xl font-bold text-primary-500">{{ $t('myTasks.title') }}</h1>
            <div class="flex gap-1">
                <button
                    class="rounded-lg p-2 transition-colors"
                    :class="viewMode === 'kanban' ? 'bg-primary-500 text-white' : 'text-neutral-400 hover:text-primary-500'"
                    :title="$t('myTasks.viewKanban')"
                    @click="viewMode = 'kanban'"
                >
                    <Icon name="mdi:view-column-outline" size="20" />
                </button>
                <button
                    class="rounded-lg p-2 transition-colors"
                    :class="viewMode === 'list' ? 'bg-primary-500 text-white' : 'text-neutral-400 hover:text-primary-500'"
                    :title="$t('myTasks.viewList')"
                    @click="viewMode = 'list'"
                >
                    <Icon name="mdi:view-list-outline" size="20" />
                </button>
            </div>
        </div>

        <!-- Filters -->
        <div class="mt-4 flex flex-wrap gap-3">
            <MalioSelect
                v-model="selectedProjectId"
                :options="projectOptions"
                label="Projet"
                :empty-option-label="$t('myTasks.allProjects')"
                min-width="!w-40"
                text-field="text-sm"
                text-value="text-sm"
            />
            <MalioSelect
                v-model="selectedGroupId"
                :options="groupOptions"
                label="Groupe"
                :empty-option-label="$t('myTasks.allGroups')"
                min-width="!w-40"
                text-field="text-sm"
                text-value="text-sm"
            />
            <MalioSelect
                v-model="selectedTagId"
                :options="tagOptions"
                label="Type"
                :empty-option-label="$t('myTasks.allTypes')"
                min-width="!w-40"
                text-field="text-sm"
                text-value="text-sm"
            />
            <MalioSelect
                v-model="selectedPriorityId"
                :options="priorityOptions"
                label="Priorité"
                :empty-option-label="$t('myTasks.allPriorities')"
                min-width="!w-40"
                text-field="text-sm"
                text-value="text-sm"
            />
            <MalioSelect
                v-model="selectedEffortId"
                :options="effortOptions"
                label="Effort"
                :empty-option-label="$t('myTasks.allEfforts')"
                min-width="!w-40"
                text-field="text-sm"
                text-value="text-sm"
            />
            <MalioSelect
                v-model="selectedAssigneeId"
                :options="assigneeOptions"
                label="Assigné"
                :empty-option-label="$t('myTasks.allAssignees')"
                min-width="!w-40"
                text-field="text-sm"
                text-value="text-sm"
            />
        </div>

        <!-- Kanban View -->
        <div v-if="viewMode === 'kanban'" class="mt-6 flex gap-4 overflow-x-auto pb-4">
            <!-- Backlog column (tasks without status) -->
            <div
                v-if="backlogTasks.length > 0"
                class="flex w-72 shrink-0 flex-col rounded-lg transition-colors"
                :class="dragOverStatusId === 0 ? 'bg-neutral-200' : 'bg-neutral-50'"
                @dragover.prevent
                @dragenter.prevent="onDragEnter(0)"
                @dragleave="onDragLeave"
                @drop.prevent="onDropBacklog($event)"
            >
                <div class="rounded-t-lg bg-neutral-500 px-4 py-3 text-sm font-bold text-white">
                    {{ $t('myTasks.backlog') }} ({{ backlogTasks.length }})
                </div>
                <div class="flex flex-col gap-3 p-3">
                    <TaskCard
                        v-for="task in backlogTasks"
                        :key="task.id"
                        :task="task"
                        @click="openTaskEdit(task)"
                    />
                </div>
            </div>

            <!-- Status columns -->
            <div
                v-for="status in sortedStatuses"
                :key="status.id"
                class="flex w-72 shrink-0 flex-col rounded-lg transition-colors"
                :class="dragOverStatusId === status.id ? 'bg-neutral-200' : 'bg-neutral-50'"
                @dragover.prevent
                @dragenter.prevent="onDragEnter(status.id)"
                @dragleave="onDragLeave"
                @drop.prevent="onDropStatus($event, status)"
            >
                <div
                    class="rounded-t-lg px-4 py-3 text-sm font-bold text-white"
                    :style="{ backgroundColor: status.color }"
                >
                    {{ status.label }} ({{ tasksByStatus(status.id).length }})
                </div>
                <div class="flex flex-col gap-3 p-3">
                    <TaskCard
                        v-for="task in tasksByStatus(status.id)"
                        :key="task.id"
                        :task="task"
                        @click="openTaskEdit(task)"
                    />
                    <p
                        v-if="tasksByStatus(status.id).length === 0"
                        class="py-4 text-center text-xs text-neutral-400"
                    >
                        {{ $t('myTasks.noTasks') }}
                    </p>
                </div>
            </div>
        </div>

        <!-- List View -->
        <div v-if="viewMode === 'list'" class="mt-6">
            <div
                v-for="task in tasks"
                :key="task.id"
                class="flex cursor-pointer items-center justify-between border-b border-neutral-100 px-4 py-3 transition-colors hover:bg-neutral-50"
                @click="openTaskEdit(task)"
            >
                <div class="min-w-0 flex-1">
                    <h4 class="text-sm font-semibold text-neutral-900">{{ task.title }}</h4>
                    <div class="mt-1 flex items-center gap-1.5">
                        <span
                            v-if="task.priority"
                            class="rounded-full px-2 py-0.5 text-xs font-semibold text-white"
                            :style="{ backgroundColor: task.priority.color }"
                        >
                            {{ task.priority.label }}
                        </span>
                        <span
                            v-for="tag in task.tags"
                            :key="tag.id"
                            class="rounded-full px-2 py-0.5 text-xs font-semibold text-white"
                            :style="{ backgroundColor: tag.color }"
                        >
                            {{ tag.label }}
                        </span>
                    </div>
                </div>
                <div class="flex items-center gap-3">
                    <button
                        class="shrink-0 transition-colors"
                        :class="isTimerOnTask(task) ? 'text-[#F18619] hover:text-[#d97314]' : 'text-neutral-400 hover:text-primary-500'"
                        @click.stop="isTimerOnTask(task) ? timerStore.stop() : timerStore.startFromTask(task)"
                    >
                        <Icon :name="isTimerOnTask(task) ? 'mdi:stop-circle-outline' : 'mdi:play-circle-outline'" size="20" />
                    </button>
                    <span
                        v-if="task.project && task.number"
                        class="text-sm font-medium text-primary-500"
                    >
                        {{ task.project.code }}-{{ task.number }}
                    </span>
                </div>
            </div>
            <p
                v-if="tasks.length === 0 && !isLoading"
                class="py-8 text-center text-sm text-neutral-400"
            >
                {{ $t('myTasks.noTasks') }}
            </p>
        </div>

        <!-- TaskModal -->
        <TaskModal
            v-model="taskModalOpen"
            :task="selectedTask"
            :project-id="selectedTask?.project?.id ?? 0"
            :statuses="statuses"
            :efforts="efforts"
            :priorities="priorities"
            :tags="tags"
            :groups="selectedTask?.project?.id ? groups.filter(g => g.project?.id === selectedTask?.project?.id) : groups"
            :users="users"
            @saved="onSaved"
        />
    </div>
</template>
